JP3561005B2 - X-link type lifting device - Google Patents

Description

[0001]
[Industrial applications]
According to the present invention, an X-type parallel expansion and contraction mechanism is provided between a base and a table so that a pair of links intersect each other to fix an intersection at the intersection, and the table is raised and lowered by opening and closing the X-type parallel expansion and contraction mechanism. The present invention relates to an X-link type elevating device.
[0002]
[Prior art]
Conventionally, an X-link type elevating device described as a known example in Japanese Patent Publication No. 57-16078 has an upper end 20 pivotally supported by a table 1 from an intersection 4 as shown in FIG. A lever 5a for pivotally connecting the base end to an inner portion of the inner link 3 leading to the inner link 3 and an outer link 2 corresponding to the vertical line symmetry of the portion of the inner link 3 from the intersection 4 to the pivot point 7 of the lever 5a. A roller 6 is attached to an inner portion on the side of the lower end 13 supported by the base 21 and is in contact with the cam arm 5 integrally connected to the lever 5a, and a cylinder is supported by the lower end 13 of the outer link 2. Further, a cylinder mechanism 10 for supporting a piston on the cam arm 5 and a stopper 9e for stopping rotation of the cam arm 5 are provided.
In the X-link type elevating device, when the cylinder mechanism 10 starts to elongate in the initial stage of elevating, the lever 5a rotates downward and presses the roller 6 upward, and the links 2 and 3 start to rise. When the cam arm 5 comes into contact with the stopper 9e, the rotation of the cam arm 5 is stopped, and the cylinder mechanism 10 directly raises the links 2 and 3.
[0003]
[Problems to be solved by the invention]
However, in the conventional X-link type elevating device, when the elevating device is folded, the roller located inside the outer link comes into contact with the lower end of the inner link, so that the inner link and the outer link overlap when viewed from the side. Because of this, the minimum ground clearance of the X-link type elevating device increases. In addition, even if a notch is simply provided at the lower end of the inner link, the rigidity of the inner link is reduced because it is close to the intersection. When the roller is moved to the lower end side, the amount of rotation of the lever is insufficient.
And because the ground height is large, it is difficult to perform installation work with excavation to provide a pit that is stored below the ground surface so that the bottom of the vehicle does not contact the table when entering the vehicle, and dust or sewage is found at the bottom of the pit. In addition to poor sanitation, repair and inspection are troublesome.
[0004]
[Means for Solving the Problems]
In view of the above, the present invention inherits the conventional basic idea. The gist of the present invention is to position a cam arm and a roller between a pair of links and to attach a cam mechanism to a cylinder mechanism which is supported by a cam arm while being close to an intersection at an end of a link. This is an X-link type elevating device that improves operability by being attached to a part. The structure is such that a pair of links cross each other between the base and the table, the intersection is fixed at the intersection, and an X-shaped parallel expansion and contraction mechanism that arranges the intersection at the center is arranged. In an X-link type elevating device that moves the table up and down by opening and closing operation,
In any one of the links from the center intersection to the end,
A cam arm pivotally connected at the base end, a lever arm that is shorter than the cam arm and pivotally connects the base end to the link on the end side from the pivot point , and the cam arms and the lever arms are operably connected to each other. A connecting member, a roller attached to the other link, a lever that is integrally connected to the base end side of the cam arm and contacts a peripheral surface of the roller on the intersection side, and from a mounting point of the roller to the intersection. And a cylinder mechanism connecting between the other link and the lever arm.
An X-link type elevating device, wherein an upper end portion of a bottom surface of a cylinder of the cylinder mechanism is attached to a link, and is housed within a vertical width of the link having lowered the elevating device.
Further, in the invention according to claim 2, the piston rod of the cylinder mechanism is attached to an end of a link that slides on the base, and the cylinder is attached to a portion near the intersection of the other link. 2. The X-link type elevating device according to claim 1, wherein the bottom surface of the X-link type elevating device is located on the upper side, and air can be removed from the oil feed pipe so as to collect floating bubbles.
[0005]
[Action]
According to the configuration of the first aspect of the present invention , when the cylinder mechanism is first extended by the expanding operation of the folded X-type parallel expansion and contraction mechanism having about half the cylinder mechanism in the longitudinal direction of the lift , one of the links is connected. The lever arm pivotally connecting the proximal end pivots, and the cam arm pivotally pivoting the proximal end to the same link near the intersection via the coupled body. Then, the rotation of the lever rod integrally connected to the base end side of the cam arm pushes the roller in contact with the peripheral surface on the intersection side upward, and the link is expanded to stand up. Be raised.
[0006]
【Example】
Hereinafter, a vehicle maintenance lift including an X-link type elevating device according to the present invention will be described with reference to the drawings.
FIG. 1 is a front view schematically showing the X-link type elevating device, showing a state in which the elevating device is raised, and partially omitting left and right longitudinal ends.
Reference numeral 1 denotes a table on which a vehicle to be maintained is placed. A base 21 is fixed to the ground surface below the table 1, and a pair of links 2 and 3 are provided between the table 1 and the base 21. Two X-shaped parallel expansion / contraction mechanisms that intersect and fix the intersection 4 at the center are arranged in parallel . The front and rear wheels on one side of the maintenance vehicle are supported by a table 1 for each one, and the maintenance vehicle on the table 1 is moved up and down by an opening and closing operation in which the two X-type parallel expansion and contraction mechanisms are synchronized. In consideration of the convenience of maintenance work at the center of the vehicle, two tables are provided on both sides of the maintenance vehicle on which the table 1 is mounted. However, when the table is a single plate or on the table 1, In some cases, a small lifting device for supporting the chassis is provided.
The outer link 2 of the X-shaped parallel expansion / contraction mechanism has its upper end 18 pivotally connected to the table 1 so as to be rotatable, and has a roller 19 fixed at its lower end, and is slidable along the rail 21r of the base 21. To be provided. On the contrary, the inner link 3 has its lower end 17 pivotally connected to the base 21 so as to be rotatable, and has a roller 20 fixed at the upper end, and is slidable along the rail 1r on the lower surface of the table 1. To be provided.
[0007]
Reference numeral 5 denotes a part of the link 2 from the intersection 4 to the lower end 19, which is closer to the intersection 4 with respect to the mounting position of the lever arm to be described later, that is, at a position 7 near the middle of the part 2a. A cam arm whose end is pivotally connected. The position of the cam arm 5 on the link 2 is closer to the later-described lever arm mounting position from the intersection 4 in the portion 2a from the intersection 4 to the lower end 19 of either the upper end or the lower end. Position 7. Reference numeral 9 denotes a lever arm that pivotally connects the base end to the same link 2 as the cam arm 5, and the lever arm 9 is attached to the link 2 on the lower end 19 side of the attachment position 7 of the cam arm 5 at the intersection 4. The position 9a is on the side farther from the camera. Reference numeral 8 denotes a connecting body that connects the tips of the cam arm 5 and the lever arm 9 to be able to interlock with each other. The length of the cam arm 5 from the connection point with the connector 8 to the pivot point 7 is longer than the length of the lever arm 9 from the connection point with the connector 8 to the pivot point 9a, and the driving force of the lever arm 9 is reduced. It can be transmitted to the cam arm 5 efficiently.
6 is attached to a portion 3b of the other link 3 which is vertically symmetrical with respect to a portion 2b of the link 2 from the intersection 4 to the pivot point 7 of the cam arm 5 with respect to a parallel line p passing through the intersection 4. Roller. Reference numeral 5b denotes a lever that is integrally connected near the base end of the cam arm 5 and that contacts the peripheral surface of the roller 6 on the intersection 4 side. The long lever 5b, which is orthogonal to the short cam arm 5, has an L-shape with the cam arm 5. The angle between the cam arm 5 and the lever 5b and the length thereof are not limited to the embodiment according to the respective mounting positions, the driving force transmitted to the cam arm 5, the weight of the maintenance vehicle, and the height of the elevator vehicle. Reference numeral 10 denotes a cylinder mechanism that connects the part 3c of the other link 3 from the attachment point 6a of the roller 6 to the intersection 4 and the central part of the lever arm 9 with each other.
[0008]
FIG. 2 is a plan view of FIG. 1 omitting the entire table 1 and an end of the rail 21r. A pair of links 2 are located outside the X-shaped parallel expansion and contraction mechanism, and a pair of links 3 are located inside the X-type parallel expansion / contraction mechanism. The cam arm 5, the lever 5 b, the connecting body 8 and the lever arm 9 are located inside the link 2 on one side, and the roller 6 is located outside the link 3. Since each of those members is located between the link 2 and the link 3 on one side, the piston rod 10b including the cylinder mechanism 10 located between the pair of links 2 and the rack 11 and the locking claw 12 as a fall prevention mechanism The cover 13 does not interfere with the lowering. The rack 11 is fixed to both sides of the cylinder 10a, and one end of the rack 11 is in contact with a locking claw 12 of a cover 13 having one end pivotally coaxial with the piston rod 10b. When the elevating device is raised, the locking claw 12 slides on the rack 11, and when the lifting device is lowered, the locking claw 12 is locked to the rack 11 to exhibit a fall prevention function. In order to release the locked state, the cylinder mechanism 10 is contracted while lifting the cover 13 to which one end is pivoted.
However, in order to transmit the pressing force of the cylinder mechanism 10 that cannot be installed between the link 2 and the link 3 on one side due to space to the lever arm 9 without interfering with the inner link 2, the vicinity of the lower end 19 of the outer arm 2 As shown in FIG. 3, the lever arm 9 is separated into a long arm 9c and a short arm 9d fixed to a rotating shaft 9b extending between the links 2 and 2, and the lever arm 9 is attached to the tip of the long arm 9c. Supports the connecting body 8 and the cylinder mechanism 10 at the distal end of the short arm 9d. When the X-type parallel expansion / contraction mechanism contracts, the relief portion 3d provided on the lower surface of the upper end portion 20 of the link 3 comes into contact with the portion of the rotating shaft 9b between the long arm 9c and the short arm 9d. Thus, on the front, the links 2 and 3 overlap in parallel. In addition, the relief portion 3d can be provided in a portion other than the upper end portion of the lower surface of the link 3 by omitting the connecting body 8 and the lever arm 9 and directly supporting the cylinder mechanism 10 on the cam arm 5, for example. However, as the notch formed in a part of the link 2 approaches the intersection 4, the bending moment increases, and the rigidity of the link 3 is reduced by the relief portion 3d. It is not preferable as a lifting device except for the above.
[0009]
Next, the operation of the lifting device will be described.
FIG. 4 is a front view showing a state in which the lifting / lowering device shown in FIG. 1 is lowered, showing the whole and a part 2a of the link 2 partially enlarged. Since each member has a height in the vertical direction that fits within the width of the folded links 2 and 3, the pit for accommodating the lifting device is not required because it has the lowest ground height as a lifting device.
When the cylinder mechanism 10 is extended, the lever arm 9 pivots toward the lower end 19 of the link 2 in the left direction in FIG. 1, and pivots the cam arm 5 and the lever 5 b via the connecting body 8 to the left. The lever 5b having a substantially right angle with the cam arm 5 comes into contact with the peripheral surface of the roller 6 and presses the roller 6 upward while rotating the roller 6, so that the links 2 and 3 stand up.
FIG. 5 is a front view showing a state in which the lifting device shown in FIG. 4 is being lifted. A stopper 9e for stopping the leftward tilting of the cam arm 5 or the lever arm 9 at a position separated at the latest from the roller 6 with which the lever 5b rotated left has come into contact. The lever 5 and the lever arm 9 stop rotating to the left, and the cylinder mechanism 10 directly expands the interval between the portion 2b of the link 2 and the portion 3b of the link 3 until the operation of raising the table 1 is as shown in FIG. Continues to.
[0010]
In particular, in the above embodiment, the cam arm 5, the lever 5b, the connecting body 8, the lever arm 9, and the lower end 17 are pivotally mounted on the lower end 19 side from the intersection 4 of the outer link 2 sliding on the lower end 19. The roller 6 and the cylinder 10a of the cylinder mechanism 10 are respectively supported on the upper end 20 side of the intersection 4 of the inner link 3 to be rotated.
That is, in FIG. 1, the cylinder 10 a of the cylinder mechanism 10 is attached not to the lower end portion 19 of the link 2 but to the portion 3 b of the link 3 close to the intersection 4 of the link 3 so that the cylinder mechanism 10 A cylinder 10a having a rigidity against bending larger than the piston rod 10b can be used in a position where the acting point must be eccentric to obtain a lifting force.
Then, the upper end of the bottom surface of the cylinder 10a is attached to the link 3, and the cylinder mechanism 10 is housed within the vertical width of the links 2, 3 in FIG. By this mounting position, the minimum ground clearance can be reduced, for example, as compared with the case where the upper end of the cylinder 3 eccentric at the center of the bottom surface projects from the link width.
Further, since the bottom surface of the cylinder 10a to which the oil feed pipe (not shown) is located above the piston rod 10b of the cylinder mechanism 10, the air bleeding of the cylinders synchronized in the two X-type parallel expansion and contraction mechanisms is performed. It can be easily performed from an oil pipe where floating bubbles are concentrated.
Furthermore, the link 3 for attaching the cylinder 10a of the cylinder mechanism 10 fixes the lower end 17 thereof, and the distance from the cylinder 10a to the lower end 17 is constant. In addition, no extra load is applied, and the oil feed pipe is not located inside the link 2 in parallel with the cylinder mechanism 10. Instead, the oil feed pipe is connected in series in the order of the cylinder 10a, the oil feed pipe, and the lower end portion 17, so that the periphery of the cylinder mechanism 10 The space can be effectively used, and the X-type parallel expansion / contraction mechanism can be downsized.
In addition, the positional relationship between the inside and outside of the cylinders 2 and 3 is such that the link 3 that pivotally connects the lower end portion 17 to the inside is inside, so that one end of the cylinder mechanism 10 can be directly supported on the link 3 that is one of the links. . In the case where the link that pivotally connects the lower end portion to the outside is set to the outside, in consideration of the minimum ground clearance, the shaft on which the cylinder of the cylinder mechanism 10 is mounted does not interfere with the inside link so that the inside link does not interfere. A portion near the intersection must be cut out to provide a relief portion.
[0011]
Although the above-described embodiment is a maintenance vehicle lift for mounting a maintenance vehicle on a table, a swivel wheel is provided on the table as a cargo handling lift having rollers for sliding cardboard or the like or on the lower surface of its base. It can also be used as a transport trolley to be provided. In the above embodiment, the positions of the cam arm 5, the lever 5b, the connecting body 8, the lever arm 9, the roller 6 and the cylinder 10a of the cylinder mechanism 10 are supported by the outer link 2 sliding on the lower end portion 19. The lower end 19 side from the intersection 4 and the upper end 20 side from the intersection 4 of the inner link 3 pivotally connecting the lower end 17 to the other end. The case where the shaft is supported at an arbitrary part is upside down, that is, on the upper end 20 side from the intersection 4 of the inner link 3 and on the lower end 19 side from the intersection 4 of the outer link 2. In the case of the lower end 17 side from the intersection 4 of the inner link 3 and the upper end 18 side of the intersection 4 of the outer link 2, The upper end 18 side of the click 2, and can be set to the case of the lower end 17 side of the inner link 3.
[0012]
【The invention's effect】
According to the first aspect of the present invention, when the X-link type elevating device that arranges the intersection at the center is folded, the inner link and the outer link overlap, and the minimum ground clearance of the X-link type elevating device is reduced. There is no need to provide a pit to keep the bottom of the vehicle from coming into contact with the vehicle. Therefore, installation work involving excavation can be omitted, and the installation work can be simplified. In addition, dust or wastewater does not accumulate at the bottom of the conventional pit, which is sanitary. Further, since the link is stored within the vertical width of the link with the lifting device lowered, the minimum ground clearance can be reduced.
Furthermore, according to the present invention, since the bottom surface of the cylinder is positioned above the piston rod and air is released from the oil feed pipe to collect air bubbles, the installation and maintenance work can be easily performed.
[Brief description of the drawings]
FIG. 1 is a front view showing a state where an X-link type elevating device according to the present invention is raised.
FIG. 2 is a plan view omitting a table in FIG. 1;
FIG. 3 is a perspective view showing a lower end portion of an outer link.
FIG. 4 is a front view showing a state where the X-link type elevating device of FIG. 1 is lowered.
FIG. 5 is a front view showing a state in which the X-link type elevating device in FIG. 1 is being lifted.
FIG. 6 is a front view showing a state where a conventional X-link type elevating device is raised.
[Explanation of symbols]
1. table, 2. outer link, 3. inner link, 4. intersection, 5. cam arm, 5b lever lever, 6. roller, 7. pivot point, 8. linked body , 9. Lever arm, 10. Cylinder mechanism.

Claims (2)

X-shaped parallel expansion and contraction in which a pair of links (2, 3) intersect each other between the base (21) and the table (1), the intersection (4) is axially fixed, and the intersection (4) is arranged at the center. An X-link type elevating device in which a mechanism is arranged and the table (1) is raised and lowered by opening and closing the X-type parallel expansion and contraction mechanism,
In any one of the links (2), from the center intersection (4) to the end,
A cam arm (5) pivotally connected to the base end , and a lever arm (9) that is shorter than the cam arm (5) and that pivotally connects the base end to the link (2) on the end side from the pivot point (7). ), A connecting body (8) for connecting the tips of the cam arm (5) and the lever arm (9) so as to be able to interlock with each other, a roller (6) attached to the other link (3), and a base of the cam arm (5). A lever (5b) integrally connected to the end side and in contact with the peripheral surface on the intersection side of the roller (6), and the other from the attachment point (6a) of the roller (6) to the intersection (4) And a cylinder mechanism (10) for connecting between the link (3) and the lever arm (9).
In the cylinder mechanism (10), the upper end of the bottom surface of the cylinder (10a) is attached to the link (3), and is housed within the vertical width of the link (2, 3) in which the elevating device is lowered. An X-link type lifting device characterized by the following. In the cylinder mechanism (10), a piston rod (10b) is attached to an end of a link (2) sliding on a base (21), and a cylinder (10a) is connected to an intersection (4) of the other link (3). 2. The air delivery pipe, which is attached to the vicinity of the piston rod, has a bottom surface of the cylinder (10a) positioned above the piston rod (10b), and air can be removed from the oil feed pipe to concentrate floating bubbles. X-link type lifting device.

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