JP7296176B1 - preceding handrail - Google Patents

Abstract

An object of the present invention is to provide a leading handrail which can be easily installed between two pillars. A circular arc-shaped long hole 12 whose center is the rotation center axis line of the engagement member when viewed from the front is formed in the upper part of the engagement member 7 of the preceding handrail 4 from the rotation center axis line of the engagement member 7. is also formed on the central side of the handrail body 5 in the longitudinal direction. A handrail main body 5 is provided with a positioning pin 9 extending in the front-rear direction and inserted into a long hole 12 so as to be movable in the longitudinal direction of the long hole 12.例文帳に追加A positioning notch 13 into which the positioning pin 9 is fitted is formed in one arcuate edge 121 of the elongated hole 12 . A handrail body 5 is provided with a compression coil spring 11 for biasing a positioning pin 9 fitted in a positioning notch 13 to the inner side of the positioning notch 13. - 特許庁The positioning pin 9 is fitted in the positioning notch 13 in the installation form in which the insertion portion 71 of the engaging member 7 and the handrail main body 5 form a right angle. [Selection drawing] Fig. 3

Description

TECHNICAL FIELD The present invention relates to a handrail installed between adjacent posts in a temporary scaffold such as a wedge binding scaffold to prevent a worker from falling from a work floor. The present invention relates to a preceding handrail used for a handrail precedent construction method in which an upper layer handrail is installed from a lower work floor prior to installation of a working floor.

In this specification and the scope of claims, the side opposite to the building in the temporary scaffold erected around the building (for example, the hand side in FIG. 1) is "front", and the building side (for example, in FIG. ) is referred to as "rear", and "left and right" refer to left and right when viewed from the front (for example, left and right in FIG. 1).

The present applicant previously proposed the one described in Patent Document 1 as a preceding handrail used for temporary scaffolding by the preceding handrail construction method.

The preceding handrail described in Patent Document 1 includes a plurality of columns erected at intervals in the left-right direction, and a plurality of socket metal fittings are provided on the left and right sides of each column at predetermined intervals in the vertical direction. In a temporary scaffolding, a preceding handrail constructed between two columns adjacent to each other on the left and right, comprising a horizontal handrail body extending in the left and right direction, and upper parts extending in the front and back direction at the left and right ends of the handrail body. It is connected rotatably around the dynamic center axis, and has an insertion part at the bottom to be inserted into a socket metal fitting provided at a predetermined height position on the left and right opposite sides of the two columns. and one end of each of the left and right engaging members is pivoted around a central axis of rotation extending in the front-rear direction between the connecting portion to the handrail main body and the insertion portion of each of the left and right engaging members. While being freely connected, the other end has a mounting portion that is detachably mounted at a predetermined height position below the socket metal fittings into which the insertion portions of the engaging members of the two columns are inserted. and two braces that are installed obliquely between the two posts so as to cross each other, wherein the preceding handrail is an insertion portion for two left and right engaging members. is perpendicular to the handrail main body, and a folded form in which the two left and right engaging members are rotated so as to extend in the extension direction of the handrail body, and the two braces are rotated along the handrail body. can be obtained.

In a more specific first form of the preceding handrail described in Patent Document 1, a connecting pin extending in the front-rear direction is provided at one of the left and right ends of the handrail main body and the upper ends of the left and right engaging members. A pair of front and rear connection wall portions having corresponding pin insertion holes through which connection pins are inserted are provided on the other side, and the pin insertion holes are long holes of a predetermined shape. The connecting pin is movable along the longitudinal direction thereof, and when the preceding handrail is in an installation form in which the insertion portions of the two left and right engaging members form a right angle with the handrail main body, the connection is possible. When the pin is positioned at one end of the pin insertion hole, vertical and horizontal movement of the handrail body is restricted, and similarly the connecting pin is positioned at the other end of the pin insertion hole. The left and right engaging members are rotatable so as to extend in the extending direction of the handrail body, and connecting pins are inserted into pin insertion holes at the left and right ends of the handrail body and at the upper ends of the left and right engaging members. When the connecting pin is located at one end of the pin insertion hole, the connecting pin engages with each other to restrict the laterally outward or laterally inward rotation of each of the left and right engaging members. An engaging portion is provided which disengages when positioned at the other end portion and permits the left and right engaging members to rotate in the above direction. .

In addition, in a more specific second form of the preceding handrail described in Patent Document 1, a central wall portion of a U-shaped holding metal fitting that opens outward in the left and right direction when viewed from the plane is formed on each of the left and right end faces of the handrail body. A pair of front and rear engaging members are fixed, and the upper portions of the right and left engaging members extend obliquely upward inward in the left and right direction, and the tip portions thereof are inserted into the inside of the holding metal fitting so as to be able to follow the back surfaces of the front and rear wall portions of the holding metal fitting. The tip portions of both connecting wall portions of the left and right engaging members are attached to the front and rear wall portions of the holding metal fittings by connecting pins penetrating therethrough. When the preceding handrail is in the installation form in which the insertion portions of the two left and right engaging members form a right angle with the handrail main body, the front end portion of both connecting wall portions is engaged by the outer surface of the central wall portion of the holding metal fitting. Engagement edges that are engaged with the surfaces to restrict the left and right engagement members from turning inward in the left and right direction are formed so as to face the engagement surfaces. Pin insertion holes are formed in the front end portion of the wall portion and the front and rear wall portions of the holding metal fitting so as to match and overlap each other when the preceding handrail is in the installation configuration. A front connecting pin is inserted across pin insertion holes formed in the front wall portions of the left and right engaging members and formed in the front wall portions of the left and right engaging members and the rear wall portions of the holding metal fittings. A rear connecting pin is inserted across the pin insertion hole, and a spring is interposed between the front connecting pin and the rear connecting pin to urge the pins in a direction away from each other. By applying an external force in the laterally outward direction to the left and right engaging members at the relative positions, with or without pressing the ends, the left and right engaging members are rotated so as to extend in the extension direction of the handrail main body. It is designed to be moved.

According to the preceding handrails of the first and second forms described in Patent Document 1, storage and transportation can be performed in a compact folded state, so the space required for storage, etc. is reduced, and in addition, transportation and workability are improved. sexuality is also improved. In addition, in the folded form, the tip of each brace does not protrude greatly from both ends of the handrail body, so there is no risk of bending or breaking due to external force during storage, transportation, or the like.

Further, in the case of the preceding handrail of the first form, when the connecting pin is positioned at one end of the pin insertion hole in the installation form, the handrail main body is moved vertically and horizontally. Movement in the direction is restricted, and in the case of the preceding handrail of the second form, the engaging edges of both connecting wall portions of each engaging member and the engaging surfaces of the holding metal fittings engage with each other when in the installed form. This restricts the inward rotation of each engaging member in the left-right direction, so that even if a worker grabs the handrail body horizontally installed between the two pillars, the handrail body will not be carelessly moved. It does not move, provides a sense of security, and enhances safety. Moreover, in the preceding handrail installation form, in the case of the preceding handrail of the first form, by positioning the connecting pin at the other end of the pin insertion hole, the left and right engaging members are attached to the handrail main body. Since it is rotatable so as to extend in the extension direction, it can be easily shifted to a folded form, and workability during assembly and disassembly is improved. In addition, in the above-described installation form of the preceding handrail, in the case of the preceding handrail of the second form, the left and right connecting links at the relative positions are pressed while or not pressing the front-rear direction outer ends of the front-rear connecting pins. By applying an outward lateral force to the handrail, the left and right engaging members can be rotated so as to extend in the extension direction of the handrail body. Workability during dismantling is improved.

Japanese Patent No. 6386205

However, in the case of the preceding handrail of the first form described in Patent Document 1, in the installation form, the connecting pin is positioned at the one end of the pin insertion hole, so that the engaging portion works to move left and right handrails. Rotation of the engaging member in either the laterally outward direction or the laterally inward direction is regulated, but the other direction is not restricted. It is difficult to insert the socket metal fittings of two struts at the same time. Further, in the case of the preceding handrail of the second form described in Patent Document 1, in the installation form, the engaging edges of both connecting wall portions of the engaging members and the engaging surfaces of the holding metal fittings are engaged with each other. , the inward rotation of each engaging member in the left-right direction is restricted, but the rotation in the other direction is not restricted. is difficult. Therefore, in any form of preceding handrail, it is necessary to insert the insertion portion of one engaging member into the socket metal fitting of one of the posts and then insert the insertion portion of the other engaging member into the socket metal fitting of the other post. There is, and the work at the time of constructing a preceding handrail between two pillars becomes troublesome.

The present invention has been made in view of the above problems, and provides a leading handrail that can be installed between two pillars more easily than the leading handrail described in Patent Document 1. It is intended to

This invention consists of the following aspects in order to achieve said objective.

1) Temporary scaffolding that is equipped with multiple columns spaced apart in the horizontal direction, and multiple socket metal fittings are provided on the left and right sides of each column at predetermined intervals in the vertical direction. A preceding handrail erected between two pillars adjacent to each other,
A horizontal handrail body extending in the left and right direction,
The upper part is connected to the left and right ends of the handrail main body so as to be rotatable about a rotation center axis extending in the front-rear direction, and the lower part is provided with a predetermined height at the laterally opposed sides of the two pillars. two left and right engaging members each having an insertion portion to be inserted into a socket metal fitting provided at a position;
One end is connected to the portion between the connecting portion to the handrail main body and the insertion portion of each of the left and right engaging members so as to be rotatable about a rotation center axis extending in the front-rear direction, and the other end is connected to the portion. a mounting portion detachably mounted at a predetermined height position below the socket metal fittings into which the insertion portions of the engaging members of the two struts are inserted, and between the two struts A leading handrail comprising two braces that are installed obliquely so as to cross each other,
The preceding handrail has an installation form in which the insertion portions of the two left and right engaging members form a right angle with the handrail main body, and one in which the two right and left engaging members are rotated so as to extend in the extension direction of the handrail main body. In a preceding handrail capable of adopting a folded configuration in which the brace is pivoted along the handrail body,
In the upper part of the engaging member, an arc-shaped elongated hole whose center is the central axis of rotation of the engaging member when viewed from the front is formed on the central side in the longitudinal direction of the handrail body from the central axis of rotation of the engaging member. The main body is provided with a positioning pin that extends in the front-rear direction and is inserted through the elongated hole so as to be movable in the longitudinal direction of the elongated hole. In the handrail main body, a positioning notch into which the positioning pin is fitted is formed, and in a state in which the positioning pin is fitted in the positioning notch, the positioning pin is biased toward the inner side of the positioning notch. Means are provided so that the locating pin fits within the locating notch in said installation configuration in which the insertion portion of the engagement member and the balustrade body are at right angles.

2) In a folded state in which the two left and right engaging members are rotated so as to extend in the extension direction of the handrail body, and the two braces are rotated along the handrail body, the positioning pin is positioned. The preceding handrail according to 1) above, wherein the positioning pin is positioned at one end of the elongated hole, and the positioning pin is positioned at the other end of the elongated hole in a state where the insertion portion of the engaging member and the handrail main body form an acute angle.

3) The engaging member is rotatably attached to the handrail body by means of a connecting pin extending in the front-rear direction and passed through a connecting pin insertion hole formed in the handrail body, and the elongated hole is connected to the engaging member. The positioning pin is formed to have a constant length in the vertical direction at a portion positioned closer to the center in the longitudinal direction of the handrail body than the pin, and the positioning pin is positioned closer to the center in the longitudinal direction of the handrail body than the connecting pin. A positioning notch is formed in an arcuate edge of the elongated hole on the central side of the handrail body in the longitudinal direction, and biasing means is disposed between the connecting pin and the positioning pin. The preceding handrail according to 1) above, comprising a compression coil spring.

4) The handrail main body is made of a tubular body, the connecting pins are passed through the connecting pin insertion holes formed in the front and rear side portions of the peripheral wall of the handrail main body and pass through the handrail main body in the diameter direction, and the positioning pins are located on the peripheral wall of the handrail main body. The preceding handrail according to 3) above, wherein the compression coil spring is disposed in the handrail body, passing through the pin insertion holes formed in the front and rear side portions and diametrically penetrating the handrail body.

5) 3 above, wherein the vertical width of the connecting pin insertion hole of the handrail body through which the connecting pin is inserted gradually narrows toward the end of the handrail body on the side closer to the connecting pin insertion hole. ) leading railing.

6) The engaging member is rotatably attached to the handrail body by means of a connecting pin extending in the front-rear direction and passed through a connecting pin insertion hole formed in the handrail body, and the elongated hole serves as a connection in the engaging member. The positioning pin is formed to have a constant length in the vertical direction at a portion that protrudes toward the longitudinal central portion of the handrail body from the pin, and the positioning pin is positioned closer to the longitudinal central portion of the handrail body than the connecting pin. A positioning notch is formed in an arc-shaped edge of the elongated hole on the longitudinal end side of the handrail body, and a biasing means is fixedly provided on the handrail body. The preceding handrail according to 1) above, comprising a compression coil spring disposed between the spring rest and the positioning pin.

7) The handrail main body is made of a tubular body, and connecting pins are passed through connecting pin insertion holes formed in the front and rear side portions of the peripheral wall of the handrail main body to pass through the handrail main body in the diameter direction, and positioning pins are provided on the peripheral wall of the handrail main body. The pin insertion holes formed in the front and rear sides of the handrail body are elongated in the longitudinal direction of the handrail body so as to be able to move in the longitudinal direction of the handrail body. 6), further comprising a compression coil spring disposed within the handrail body.

8) The preceding handrail according to 4) or 7) above, wherein the elongated holes are formed in a pair of front and rear support portions provided in the engaging member, and the connecting pin is held between the support portions.

According to the preceding handrails 1) to 8) above, the positioning pins are fitted in the positioning cutouts in the installation form in which the insertion portion of the engaging member and the handrail main body form a right angle. The positioning pin fitted in the positioning notch of the long hole of the joint member is biased toward the inner side of the positioning notch by the biasing means. It is reliably held in the correct posture that forms a right angle to it. Therefore, the insertion portions of the right and left engaging members can be simultaneously and reliably inserted into the socket metal fittings of the left and right struts. As compared with the preceding handrail described in Patent Document 1, in which the insertion portion of the engaging member is inserted into the socket metal fitting of the other post, the operation for installing between the two posts can be easily performed.

Further, when the engaging member is rotated outward in the left-right direction so that a force larger than the biasing force of the biasing means in the direction to escape from the positioning notch is applied to the positioning pin, the positioning pin moves toward the positioning notch. It shifts to the folded form by escaping from and moving in the long hole. Therefore, compared with the first type of preceding handrail described in Patent Document 1, in which it is necessary to move the connecting pin to the other end of the elongated hole, it is possible to easily perform the work of shifting to the folded state.

According to the preceding handrail of 2) above, the posture of the engaging member can be easily confirmed by the position of the positioning pin in the elongated hole. Also, depending on the form of the temporary scaffolding on which the preceding handrail is to be erected, after inserting the insertion portion of one engaging member into the socket metal fitting of one of the posts, the insertion portion of the other engaging member is inserted into the socket metal fitting of the other post. In this case, by rotating the engaging member so that the positioning pin is positioned at the other end of the long hole, an acute angle is formed between the insertion portion of the engaging member and the handrail main body. You can easily do it if you keep it in place.

According to the preceding handrails 3) and 6) above, the urging means for urging the positioning pin to the far side of the positioning notch in a state in which the positioning pin is fitted in the positioning notch is relatively simple. can be provided in a simple configuration.

According to the preceding handrail of 4) above, the compression coil spring of the biasing means can be reliably held between the connecting pin and the positioning pin.

According to the preceding handrail of 5) above, the positioning pins at both ends of the handrail body are fitted into the positioning notches of the elongated holes of both engaging members, respectively, and the positioning pins are pushed deep into the positioning notches by the biasing means. In a state in which the insertion portion of the engaging member and the handrail main body are perpendicular to each other, the connecting pin is strongly pressed against the narrowed portion of the connecting pin insertion hole in the vertical direction. , rattling of the engaging member is prevented.

According to the preceding handrail of 7) above, the compression coil spring of the biasing means can be reliably held between the spring bearing and the positioning pin.

1 is a partial front view of a temporary scaffold with leading handrails of the present invention; FIG. FIG. 4 is a partially enlarged front view showing an installation form of the preceding handrail according to the present invention, with a part of the engaging member cut away; FIG. 3 is a partially enlarged front view of the handrail main body showing the installation form of the preceding handrail of FIG. 2 ; Fig. 3 is a left side view showing an installation form of the preceding handrail of Fig. 2; FIG. 3 is a partial enlarged front view showing a folded form of the leading handrail of FIG. 2 with a part cut away; 3 is a partially cutaway front view showing a state in which an insertion portion of an engaging member of the preceding handrail in FIG. 2 forms an acute angle with respect to a handrail main body; FIG. 3 is an enlarged front view showing a portion of the handrail main body of the preceding handrail of FIG. 2; FIG. Fig. 3 is an enlarged front view showing an engagement member of the leading handrail of Fig. 2; It is a figure equivalent to FIG. 2 which shows other embodiment of the preceding handrail of this invention. It is a figure equivalent to FIG. 3 which shows the preceding handrail of FIG. FIG. 10 is an enlarged front view showing a portion of the handrail main body of the preceding handrail of FIG. 9; Fig. 3 is an enlarged front view showing an engagement member of the leading handrail of Fig. 2;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a temporary scaffold on which a leading handrail is installed according to an embodiment of the invention, and FIGS. 2 to 6 show the leading handrail according to an embodiment of the invention. 7 shows the handrail main body of the leading handrail according to the embodiment of the invention, and FIG. 8 shows the engaging members as well.

In FIG. 1, the temporary scaffolding (1) has a plurality of columns (2) which are spaced apart from each other in two rows in the front and rear direction and are spaced in the left and right direction for each row (in FIG. 1, , showing only the two stanchions (2) in the front row).

A plurality of U-shaped socket fittings (21) are welded and fixed to the front, rear, left, and right sides of the surface of each post (2) at predetermined intervals in the vertical direction. In each strut (21), the front, rear, left, and right socket fittings (21) are provided at the same height position.

Wedge-shaped inserts are provided at the front and rear ends of cross bars (not shown) in socket fittings (21) on the front and rear sides facing each other at a predetermined height position of two columns (2) arranged in front and behind. Metal fittings (not shown) are inserted from above and latched, thereby connecting both struts (2) and the horizontal beams. Hooks provided at the left and right ends of the treads (not shown) are hooked to two laterally adjacent horizontal beams, whereby the treads are bridged to both horizontal beams, and these treads serve as temporary scaffolding. It constitutes the working floor (3) of (1).

A leading handrail (4) according to the present invention is installed in the upper region of the working floor (3) between two adjacent pillars (2).

The preceding handrail (4) according to the present invention is not limited to the temporary scaffolding (1) having the structure described above, but can be installed on other wedge binding scaffolds having different types and arrangements of socket fittings, for example. Specifically, for example, a plate-type socket metal fitting in which vertical through-holes into which locking portions can be inserted are drilled at four locations on each support, such as a substantially doughnut-shaped plate (vertical through-holes in the same plate). The preceding handrail of the present invention can also be installed in a temporary scaffold in which the socket metal fittings (21) are attached at predetermined intervals in the vertical direction.

As shown in FIGS. 2 to 6, the preceding handrail (4) consists of a horizontal handrail body (5) extending in the left-right direction and formed of, for example, a steel pipe material having a circular cross section, and a handrail body (5) at the upper end. 5) are rotatably connected to each of the left and right ends of 5) by connecting pins 6 having a circular cross section extending in the front-rear direction around the central axis of rotation extending in the front-rear direction. Two left and right hooks having insertion portions (71) to be inserted into socket metal fittings (21) provided at a predetermined height position (uppermost in FIG. 1) on the left and right sides of the column (2). One end of the joint member (7) extends in the front-rear direction between the connecting portion to the handrail main body (5) and the insertion portion (71) at the intermediate length of each of the left and right engaging members (7). The other end is detachably attached to a predetermined height position below the socket fitting (21) of the two support columns (2). It is equipped with two braces (8) that are installed diagonally so as to intersect each other between two struts (2).

The preceding handrail (4) has an installation form (see FIGS. 1 to 4) in which the insertion portions (71) of the two left and right engaging members (7) are perpendicular to the handrail main body (5), and two left and right engaging members. (7) is rotated to extend in the extension direction of the handrail body (5), and the two braces (8) are rotated along the handrail body (5) (see Fig. 5). Also, the insertion portion (71) of the engaging member (7) and the handrail body (5) form an acute angle (see FIG. 6).

As shown in FIGS. 2 to 7, connecting pins for rotatably connecting the engaging members (7) to the handrail body (5) are provided on the front and rear sides of the peripheral wall at the left and right ends of the handrail body (5). A through-shaped connecting pin insertion hole (51) for passing (6) is formed. The peripheral edge of the connecting pin insertion hole (51) is formed in the longitudinal central portion of the handrail body (5), has a radius of curvature larger than the radius of the connecting pin (6), and extends in the longitudinal direction of the handrail body (5). A large arcuate portion (52) bulging toward the central portion, and a curvature smaller than the radius of the connecting pin (6) is formed on the end portion of the handrail body (5) adjacent to the connecting pin insertion hole (51). 2 connecting both ends of the large arc-shaped portion (52) and both ends of the small arc-shaped portion (53) with a small arc-shaped portion (53) which has a radius and bulges on the opposite side of the large arc-shaped portion (52); It consists of two straight portions (54) (see FIG. 7). Therefore, the width of the connecting pin insertion hole (51) in the vertical direction is slightly larger than the outer diameter of the connecting pin (6) at the longitudinally central end of the handrail body (5). From the longitudinal center side of the handrail body (5) so that the end of the main body (5) close to the connecting pin insertion hole (51)) is slightly smaller than the outer diameter of the connecting pin (6). It gradually narrows towards the opposite side.

Circular pin insertion holes (55) are formed in the front and rear portions of the handrail body (5) on the longitudinal center side of the handrail body (5) relative to the connection pin insertion holes (51) at the left and right ends of the peripheral wall of the handrail body (5). formed (see FIG. 7). A positioning pin (9), which extends in the front-rear direction and determines the rotational position of the engaging member (7) with respect to the handrail body (5), is passed through both pin insertion holes (55) to move the handrail body (5) to a diametrical position. It is attached to the handrail body (5) so as not to move in the longitudinal direction of the handrail body (5) in a state of penetrating in the direction. A required length of the front and rear ends of the positioning pin (9) protrudes outward from the peripheral wall of the handrail body (5). Between the connecting pin (6) and the positioning pin (9) in the handrail body (5), the connecting pin (6) is inserted into the small arc-shaped portion (53) of the connecting pin insertion hole (51) in the handrail body (5). ) and the positioning pin 9 toward the longitudinal center of the handrail body 5 (right side in FIG. 3).

As shown in FIGS. 2 to 6 and 8, the engaging member (7) is connected to the main body (72) and the handrail main body (5) integrally connected to the upper end of the main body (72). It consists of a mounting portion (73). The body portion (72) has a substantially U-shaped cross section, and is composed of a pair of front and rear flange portions (721) and a web portion (722) that integrally connects the left and right outer edges of both flange portions (721). It is bent in the middle part in the longitudinal direction so as to have a doglegged shape when viewed from the front. The end of the web portion (722) opposite to the connection portion to the handrail body (5) is cut over a required length, and the cut portion of the web portion (722) has both flange portions (721). A tapered portion (723) is provided at one end of the body portion (72) by bending in a direction toward each other (see FIG. 4). A portion of the main body (72) closer to the tapered portion (723) than the central bent portion serves as an insertion portion (71) to be inserted into the metal socket (21) of the support (2). In addition, at the bent portion of the central portion in the longitudinal direction of the body portion (72), protrusions (724) protrude toward the longitudinal center side (inward in the left-right direction) of the handrail body (5) on both the front and rear flange portions (721). is provided.

The mounting portion (73) of the engaging member (7) extends outward in the front-rear direction so as to form a right angle with the upper end of each flange portion (721) of the body portion (72). Two protruding plate-shaped base portions (731), and plate-shaped plate-shaped base portions (731) protruding upward so as to form a right angle with each base portion (731) connected to the front-rear direction outer edge of each base portion (731). It consists of a support part (732). A connecting pin (6) extending in the front-rear direction is passed through a connecting pin insertion hole (51) formed in the handrail body (5), and both front and rear ends are formed in circular support portions (732). The engaging member (7) is attached to the support (732) while being passed through the through hole (734). It is rotatable around. The hole diameter of the through hole (734) is slightly larger than the outer diameter of the connecting pin (6). The front and rear end portions of the connecting pin (6) protrude further outward than the front and rear support portions (732), and the protruding end portions are provided with heads (61) to prevent them from coming off from the through holes (734). provided (see FIG. 4).

The central axis of the connecting pin (6) is attached to the portion of the supporting portion (732) of the mounting portion (73) of the engaging member (7) closer to the longitudinal center of the handrail body (5) than the connecting pin (6). That is, an arcuate long hole (12) is formed as viewed from the front around the rotation center axis of the engaging member (7). The long hole (12) has a constant vertical dimension. The front and rear end portions of the positioning pin (9) protruding outward from the peripheral wall of the handrail body (5) can be moved into the long hole (12) in the longitudinal direction of the long hole (12). is inserted. The positioning pin (9) does not come off from the long hole (12) of the engaging member (7) and the circular pin insertion hole (55) of the handrail body (5). For example, the front and rear end portions of the positioning pin (9) protrude outward in the front-rear direction from the front and rear support portions (732), and the positioning pin (9) extends into the elongated hole (7) of the engaging member (7). 12) and a head (not shown) is provided to prevent the circular pin insertion hole (55) of the handrail body (5). Either one of the two opposing arc-shaped edges (121) of the elongated hole (12), here the elongated hole (12) at the arc-shaped edge (121) on the longitudinal central side of the handrail body (5) A positioning notch (13) into which the positioning pin (9) is fitted is formed in the central portion in the longitudinal direction.

The positioning pin (9) is fitted in the positioning notch (13) in the above-described installation form of the preceding handrail (4), and is pushed by the compression coil spring (11) to the longitudinal center side of the handrail body (5). That is, it is urged toward the far side of the positioning notch (13). Further, the positioning pin (9) is located at the end on the counterclockwise side of the rotation center of the engaging member (7) in the long hole (12) when the preceding handrail (4) is in the above-described folded configuration. Positioned at the end on the clock side of the rotation center of the engaging member (7) in the long hole (12) when the insertion portion (71) of the joint member (7) and the handrail body (5) form an acute angle. do.

The two braces (8) (brace) are made of, for example, a steel pipe material having a circular cross section, and are installed diagonally between the two struts (2) so as to intersect each other. At one end of each brace (8), a crushed portion (81) is formed by being crushed in the front-rear direction. It is arranged between the parts (724) and is rotatably pivoted about a horizontal axis extending in the front-rear direction by a support pin (14) extending in the front-rear direction and penetrating the projecting part (724) and the crushing part (81). ing. The other end of each brace (8), i.e., the tip, is provided with a mounting portion (82) that is detachably mounted at a predetermined height below the socket metal fittings (21) on both struts (2). (See Figure 1). The mounting portion (82) has a U-shape that opens outward in the left-right direction when viewed from the front. The mounting portion (82) is not limited to the one having the above configuration, and may be a clamp or the like.

2 to 8 show the left side of the handrail body 5, the left side engaging member 7, the connecting structure between the handrail body 5 and the left side engaging member 7, and the left hand side. The details of the connection structure between the engaging member (7) and the left end of the brace (8) are shown, but the right portion of the handrail body (5), the right engaging member (7), the handrail body (5). and the right engaging member (7), and the connecting structure between the right engaging member (7) and the right end of the brace (8) are bilaterally symmetrical, so illustration is omitted.

As shown in FIGS. 2 and 3, the insertion portion (71) of the engaging member (7) and the handrail body (5) are perpendicular to each other, and the positioning pin (9) is positioned in the positioning notch (13). ). The positioning pin (9) fitted in the positioning notch (13) of both engaging members (7) is urged toward the inner side of the positioning notch (13) by the compression coil spring (11). Therefore, the positioning pin (9) is prevented from escaping from the positioning notch (13), and as a result, the insertion portions (71) of both engaging members (7) form a right angle with respect to the handrail body (5). Reliably held in correct posture. Therefore, the insertion portions (71) of the left and right engaging members (7) can be simultaneously and reliably inserted into the socket fittings (21) of the left and right struts (2).

When the engaging member (7) is turned laterally outward (clockwise in FIGS. 2 and 3) against the urging force of the compression coil spring (11), the positioning pin (9) moves into the positioning notch ( 13), it becomes possible to relatively move in the counterclockwise direction in FIGS. 2 and 3 within the elongated hole 12, allowing the engaging member 7 to rotate outward in the left-right direction. Therefore, when storing or transporting the preceding handrail (4), as shown in FIG. The left and right engaging members (7) are rotated so as to extend in the extension direction of the handrail body (5), and the two braces (8) are brought close to the handrail body (5). Alternatively, it may be rotated so as to abut and follow and shift to the folded form.

Furthermore, depending on the form of the temporary scaffold on which the preceding handrail (4) is to be erected, after inserting the insertion portion (71) of one of the engaging members (7) into the socket fitting (21) of one of the posts (2), The insertion portion (71) of the other engaging member (7) may be inserted into the socket metal fitting (21) of the other strut (2). In this case, as shown in FIG. Rotate the engaging member (7) so that 9) is positioned at the other end of the elongated hole (12) (the end of the elongated hole (12) on the clock side with respect to the rotation center of the engaging member (7)). This can be easily done by moving the insertion portion (71) of each engaging member (7) and the handrail body (5) to form an acute angle.

In the above embodiment, the positioning pin (9) fitted in the positioning notch (13) of the slot (12) is a compression coil disposed between the connecting pin (6) and the positioning pin (9). A spring (11) biases the positioning notch (13) toward the back side. However, the present invention is not limited to this, and a spring mounting portion is provided in a fixed manner in the center of the longitudinal direction (right side in FIG. 3) of the positioning pin (9) in the handrail body (5), and one end is A tension coil spring attached to the spring mounting portion and having the other end attached to the positioning pin (9) moves the positioning pin (9) fitted in the positioning notch (13) to the positioning notch (13). ) may be biased toward the back side.

9-12 show another embodiment of the leading handrail of the present invention.

9 to 12, the same components and parts as those shown in FIGS. 1 to 8 are denoted by the same reference numerals.

9 to 12, engaging members (7A) are rotatably connected to the handrail body (5) at the front and rear portions of the peripheral wall at the left and right ends of the handrail body (5) of the leading handrail (4A). A through-shaped circular connecting pin insertion hole (56) is formed through which the connecting pin (6) is inserted. The hole diameter of the connecting pin insertion hole (56) is slightly larger than the outer diameter of the connecting pin (6). The connecting pin (6) extending in the front-rear direction is passed through a connecting pin insertion hole (56) formed in the handrail body (5A), and both front and rear ends thereof are supported by both support portions (732) of the engaging member (7A). The connecting pin (6) extends the engaging member (7A) to the handrail body (5) in the front-rear direction. It is rotatable around a rotation center axis.

In addition, in the longitudinal direction of the handrail body (5A), on both front and rear sides of the handrail body (5A) on the longitudinal center side of the handrail body (5A) from the connecting pin insertion holes (56) at the left and right ends of the peripheral wall of the handrail body (5A). A pin insertion hole (57) consisting of a long penetrating slot is formed. A positioning pin (9), which extends in the front-rear direction and determines the rotational position of the engaging member (7A) with respect to the handrail body (5A), is passed through both pin insertion holes (57) to extend the handrail body (5A) in diameter. It is attached to the handrail body (5A) so that it can move in the longitudinal direction of the pin insertion hole (57) while penetrating in the direction. A required length of the front and rear ends of the positioning pin (9) protrudes outward from the peripheral wall of the handrail body (5A). Further, a spring retainer (58) is fixedly provided in the handrail body (5A) on the longitudinal center side of the handrail body (5A) relative to the pin insertion hole (57). A compression coil spring (11) is arranged between the spring bearing (58) and biases the positioning pin (9) toward the longitudinal end (left side in FIG. 10) of the handrail body (5A).

The central axis of the connecting pin (6) is attached to the portion of the supporting portion (732) of the mounting portion (73) of the engaging member (7A) closer to the longitudinal center of the handrail body (5) than the connecting pin (6). That is, an arcuate elongated hole (15) is formed as viewed from the front around the rotation center axis of the engaging member (7A). The long hole (15) has a constant vertical dimension. The front and rear end portions of the positioning pin (9) protruding outward from the peripheral wall of the handrail body (5A) can move into the long hole (15) in the longitudinal direction of the long hole (15). is inserted. The positioning pin (9) does not come off from the long hole (15) of the engaging member (7A) and the pin insertion hole (57) of the handrail body (5). For example, the front and rear end portions of the positioning pin (9) protrude outward in the front-rear direction from the front and rear support portions (732), and the positioning pin (9) extends into the elongated hole (7A) of the engaging member (7A). 15) and a head (91) for preventing the pin from coming out of the hole (57) of the handrail body (5A). At the center of the long hole (15) in the longitudinal direction of the arc-shaped edge (151) on the longitudinal end side of the handrail body (5A) of the two opposing arc-shaped edges (151) of the long hole (15). A positioning notch (16) into which the positioning pin (9) is fitted is formed. In addition, at least part of the head (91) of the positioning pin (9) extends into the elongated hole (15) along the arcuate edge (151) on the longitudinally central side of the handrail body (5A) in the elongated hole (15). A convex portion (17) is provided so as to protrude from the end of the handrail body (5A) in the longitudinal direction.

The positioning pin (9) fits into the positioning notch (16) in the installation form of the preceding handrail (4A) in which the insertion portion (71) of the engaging member (7A) and the handrail body (5A) form a right angle. At the same time, the compression coil spring (11) urges the end of the handrail body (5A) close to the long hole (15), ie, the back side of the positioning notch (16).

The positioning pin (9) is fitted into the positioning notch (16) when the insertion portion (71) of the engaging member (7A) and the handrail body (5A) are perpendicular to each other. The positioning pin (9), which is fitted in the positioning notch (16) of the long hole (15) of both engaging members (7A), is pushed deep into the positioning notch (16) by the compression coil spring (11). Since the locating pin (9) is prevented from escaping from the locating notch (16), the insertion portion (71) of each of the engaging members (7A) is pushed toward the handrail body (5A). securely held in the correct orientation at right angles to the Therefore, the insertion portions (71) of the left and right engaging members (7A) can be simultaneously and reliably inserted into the socket fittings (21) of the left and right struts (2).

When the engaging member (7A) is turned laterally outward (clockwise in FIGS. 9 and 10) against the urging force of the compression coil spring (11), the positioning pin (9) moves into the positioning notch ( 16), it becomes possible to move counterclockwise in FIGS. 9 and 10 in the long hole (15), and the engaging member (7A) is allowed to rotate outward in the left-right direction. Therefore, when storing or transporting the preceding handrail (4), the positioning pin (9) is moved to the end on the counterclockwise side around the rotation center of the engaging member (7A) in the long hole (15). The left and right engaging members (7A) are rotated so as to extend in the extension direction of the handrail body (5A), and the two braces (8) are brought close to or in contact with the handrail body (5A). It may be rotated to transition to the folded form.

Furthermore, depending on the form of the temporary scaffolding (1) on which the preceding handrail (4A) is to be erected, the insertion part (71) of one of the engaging members (7A) is inserted into the socket fitting (21) of one of the posts (2). After that, the insertion part (71) of the other engaging member (7A) may be inserted into the socket metal fitting (21) of the other strut (2). By rotating the engaging member (7A) so that it is positioned at the other end of the hole (15) (the end on the clock side of the center of rotation of the engaging member (7A) in the elongated hole (15)). This can be easily done by forming an acute angle between the insertion portion (71) of each engaging member (7A) and the handrail body (5A).

In the other embodiment shown in FIGS. 9-12, the positioning pin (9) fitted in the positioning notch (16) of the elongated hole (15) consists of the positioning pin (9) and the spring bearing (58). The compression coil spring (11) disposed between the two is urged toward the inner side of the positioning notch (16). However, it is not limited to this, and a spring mounting portion is fixedly provided at the longitudinal end (left side in FIG. 10) of the positioning pin (9) in the handrail body (5), and one end is A tension coil spring attached to the spring mounting part and having the other end attached to the positioning pin (9) moves the positioning pin (9) fitted in the positioning notch (16) to the positioning notch (16). ) may be biased toward the back side.

INDUSTRIAL APPLICABILITY The present invention is suitably used as a leading handrail in order to prevent workers from falling from the work floor in temporary scaffoldings that are assembled and dismantled by the handrail leading construction method.

(1): Temporary scaffold, (2): Post, (21): Socket fitting, (4) (4A): Preceding handrail, (5) (5A): Handrail body, (51) (56): Connection pin insertion Hole (55) (57): Pin insertion hole (58): Spring holder (6): Connecting pin (7) (7A): Engagement member (71): Insertion part (8): Brace , (82): mounting portion, (9): positioning pin, (12), (15): arc-shaped slot, (121), (151): arc-shaped edge, (11): compression coil spring, (13) (16): Notch for positioning.

Claims (8)

Temporary scaffolding that has a plurality of pillars set up at intervals in the left and right direction, and a plurality of socket metal fittings are provided on the left and right sides of each pillar at predetermined intervals in the vertical direction. A leading handrail erected between two mating stanchions,
A horizontal handrail body extending in the left and right direction,
The upper part is connected to the left and right ends of the handrail main body so as to be rotatable about a rotation center axis extending in the front-rear direction, and the lower part is provided with a predetermined height at the laterally opposed sides of the two pillars. two left and right engaging members each having an insertion portion to be inserted into a socket metal fitting provided at a position;
One end is connected to the portion between the connecting portion to the handrail main body and the insertion portion of each of the left and right engaging members so as to be rotatable about a rotation center axis extending in the front-rear direction, and the other end is connected to the portion. a mounting portion detachably mounted at a predetermined height position below the socket metal fittings into which the insertion portions of the engaging members of the two struts are inserted, and between the two struts A leading handrail comprising two braces that are installed obliquely so as to cross each other,
The preceding handrail has an installation form in which the insertion portions of the two left and right engaging members form a right angle with the handrail main body, and one in which the two right and left engaging members are rotated so as to extend in the extension direction of the handrail main body. In a preceding handrail capable of adopting a folded configuration in which the brace is pivoted along the handrail body,
In the upper part of the engaging member, an arc-shaped elongated hole whose center is the central axis of rotation of the engaging member when viewed from the front is formed on the central side in the longitudinal direction of the handrail body from the central axis of rotation of the engaging member. The main body is provided with a positioning pin that extends in the front-rear direction and is inserted through the elongated hole so as to be movable in the longitudinal direction of the elongated hole. In the handrail main body, a positioning notch into which the positioning pin is fitted is formed, and in a state in which the positioning pin is fitted in the positioning notch, the positioning pin is biased toward the inner side of the positioning notch. Means are provided so that the locating pin fits within the locating notch in said installation configuration in which the insertion portion of the engagement member and the balustrade body are at right angles. When the two braces are rotated along the handrail body, the two braces are rotated along the handrail body. 2. The preceding handrail according to claim 1, wherein the positioning pin is positioned at the other end of the elongated hole with the insertion portion of the engaging member forming an acute angle with the handrail main body. The engaging member is rotatably attached to the handrail body by a connecting pin extending in the front-rear direction and passed through a connecting pin insertion hole formed in the handrail body. is formed to have a constant length in the vertical direction at a portion located on the central side in the longitudinal direction of the handrail body, and the positioning pin is located on the central side in the longitudinal direction of the handrail body rather than the connecting pin. The compression coil is provided so as not to move in any direction, the positioning notch is formed in the arcuate edge of the longitudinally central portion of the handrail body in the elongated hole, and the biasing means is arranged between the connecting pin and the positioning pin. 2. The leading handrail of claim 1, comprising a spring. The handrail main body is made of a tubular body, the connecting pins are passed through the connecting pin insertion holes formed in the front and rear side portions of the peripheral wall of the handrail main body and penetrate the handrail main body in the diameter direction, and the positioning pins are provided on the front and rear sides of the peripheral wall of the handrail main body. 4. A leading handrail according to claim 3, wherein a compression coil spring is disposed within the handrail body and extends diametrically through the handrail body through a pin through hole formed in the portion. Claim 3, wherein the vertical width of the connecting pin insertion hole of the handrail body through which the connecting pin is inserted gradually narrows toward the end of the handrail body on the side closer to the connecting pin insertion hole. leading railing. The engaging member is rotatably attached to the handrail body by a connecting pin extending in the front-rear direction and passed through a connecting pin insertion hole formed in the handrail body. is formed in a portion protruding toward the central portion in the longitudinal direction of the handrail body so as to have a certain length in the vertical direction, and the positioning pin is positioned closer to the central portion in the longitudinal direction of the handrail body than the connecting pin. a locating notch formed in an arcuate edge of the longitudinal end of the handrail body in the slot, and biasing means being a spring fixedly mounted on the handrail body 2. A leading handrail according to claim 1, comprising a compression coil spring disposed between the catch and the locating pin. The handrail main body is made of a tubular body, the connecting pins are passed through the connecting pin insertion holes formed in the front and rear side portions of the peripheral wall of the handrail main body and penetrate the handrail main body in the diameter direction, and the positioning pins are provided on the front and rear sides of the peripheral wall of the handrail main body. A pin insertion hole formed in a portion of the handrail body extending in the longitudinal direction of the handrail body is inserted so as to be movable in the longitudinal direction of the handrail body, and penetrates the handrail body in a diametrical direction. 7. A leading handrail according to claim 6, wherein a compression coil spring is disposed within the handrail body. 8. The preceding handrail according to claim 4 or 7, wherein the elongated holes are formed in a pair of front and rear support portions provided in the engaging member, and the connecting pin is fixed between the support portions.

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