JP2016179519A - Knock pin removal jig - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a knock pin removal jig which is usable even in a narrow work space.SOLUTION: A knock pin removal jig includes: a movable body including an engagement part which engages with a head part of a male screw inserted into a knock pin with a female screw and a screw part; a feed screw which threadedly engages with the screw part of the movable body; and a case which rotatably supports the head of the feed screw and houses the movable body between the head part and a leg part of the feed screw so that the movable body can move in a longitudinal direction of the feed screw.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a knock pin extraction jig that is fitted and held on the outer surface of a workpiece and used when positioning the workpiece with another workpiece.

  A knock pin removing jig is used to remove a knock pin when exchanging or adjusting a workpiece such as a mold. The knock pin removing jig described in Patent Document 1 can hold the head of a male screw inserted into a female threaded knock pin, and the knock pin can be pulled out of the work by pulling the entire jig away from the work in this state.

JP 2009-142965 A

  When pulling out a knock pin using the above-described knock pin removing jig, it is necessary to separate the jig from the work by the length of the knock pin to be pulled out, and thus it is necessary to secure a work space in the drawing direction.

  An object of this invention is to provide the knock pin extraction jig | tool which can be used in a narrow work space.

  The knock pin removing jig of the present invention includes a movable body that includes an engaging portion that engages with a head portion of a male screw inserted into a knock pin with a female screw, and a threaded portion of the movable body. A screw and a case that supports the head of the lead screw so as to be pivotable and accommodates the movable body so as to be movable in the longitudinal direction of the lead screw between the head and the leg of the lead screw. .

  In the above knock pin removing jig, the engaging portion of the moving body can be engaged with the head of the male screw inserted into the knock pin with the female screw. Further, the feed screw can be turned with its head supported by the case. The moving body is screwed with the feed screw at the screwing portion and is housed in the case between the head and the leg of the feed screw. When the feed screw is turned, the moving body is housed in the case. And moves along the longitudinal direction of the lead screw between its head and legs. The knock pin can be pulled out by turning the feed screw and moving the moving body from the leg side to the head side of the feed screw. Since the knock pin can be pulled out by moving only the moving body without moving the entire knock pin removal jig, it is not necessary to secure the work space in consideration of the length of the knock pin, and the work space can be greatly reduced. it can. For example, when pulling out the knock pin by moving the entire knock pin removal jig upward as in the prior art, it is necessary to secure a working space at least from the upper surface of the workpiece over the total length of the knock pin and the knock pin removal jig. was there. On the other hand, in the knock pin removing jig of the present invention, since the knock pin can be pulled out from the workpiece by moving only the moving body by the entire length of the knock pin, the work space can be removed from the upper surface of the workpiece. Just as much as the jig is sufficient. Further, according to the knock pin removing jig, the knock pin can be pulled out while the moving body is slowly moved in the pulling direction by turning the feed screw. For this reason, when pulling out the knock pin, it is possible to suppress the workpiece from being fluctuated due to a strong impact. Moreover, the knock pin removing jig of the present invention is composed of three members and has a small number of parts.

  In the above knock pin removing jig, the case includes a head support wall that supports the head of the feed screw, and a leg support wall that supports the leg of the feed screw so as to face the head support wall. A frame having an opposing side wall that extends between the head support wall and the leg support wall and holds the movable body may be used. Since the case is a frame body, the knock pin can be pulled out while being visually monitored from the opened direction, thereby improving workability. Further, if the feed screw and the moving body are separated by turning the feed screw in the direction of loosening the screw, the moving body can be pulled out from the opening direction of the case, which is a frame body, and replaced.

  The leg support wall of the case may include a support part that supports the leg part of the feed screw and protrusions that protrude from the four corners of the support part. While the dowel pin is in contact with the workpiece where the dowel pin is fitted and held at the projecting part, it does not come into contact with the support part that supports the leg part of the feed screw. Rotation with the screw can be prevented. In addition, when the feed screw turns, four projecting portions projecting from the four corners of the support portion are pressed against the workpiece, and one of the projecting portions serves as a center of rotation of the rotational motion caused by the turning of the feed screw, A rotational moment acts on the other protrusions located on the diagonal, and a static frictional force is generated between the workpiece and the protrusions. Thereby, it is possible to suppress the knock pin removing jig from sliding on the workpiece when the feed screw is turned.

It is a perspective view of the knock pin extraction jig | tool of an Example. It is a top view of the knock pin extraction jig | tool of an Example. It is a longitudinal cross-sectional view of the knock pin extraction jig | tool of the Example cut | disconnected by the III-III line. It is a side view of the knock pin extraction jig | tool of an Example. It is a bottom view of the knock pin extraction jig | tool of an Example. It is a perspective view of a moving body. It is a longitudinal cross-sectional view of the knock pin extraction jig | tool of an Example, and shows the state which inserted the external thread in the internal thread of the knock pin, and engaged the engaging part of the moving body of the knock pin extraction jig with the head part of the external thread. It is a side view of the knock pin extraction jig | tool of an Example, and shows the state which inserted the external thread in the internal thread of the knock pin, and engaged the engaging part of the moving body of the knock pin extraction jig with the head part of the external thread. It is a longitudinal cross-sectional view of the knock pin extraction jig | tool of an Example, and shows the state which moved the moving body from the state of FIG. 7 to the extraction direction of a knock pin. It is a side view of the knock pin extraction jig | tool of an Example, and shows the state which moved the mobile body from the state of FIG. 8 in the extraction direction of a knock pin.

  The knock pin removing jig disclosed in this specification is fitted and held on the outer surface of a workpiece, and is used for inserting and extracting a male screw into a female screw knock pin used when positioning the workpiece with another workpiece. .

  The above knock pin removing jig includes a feed screw, a moving body, and a case. The feed screw may be a male screw-like member, and a commercially available bolt or the like can be used. The moving body includes an engaging portion and a screwing portion, and is screwed with the feed screw at the screwing portion. The engaging portion only needs to have a shape that can be engaged with the head of a male screw inserted into the knock pin, and the screwing portion is formed with a female screw for screwing with a male screw-shaped feed screw. That's fine. Further, the moving body may be one in which the engaging portion and the screwing portion are integrally formed, or one manufactured as a separate member may be fixed to each other. The case may support only the head of the lead screw, but when supporting both the head and the leg of the lead screw, the operation of removing the knock pin can be performed more stably. . In addition, the case accommodates the moving body in a state in which the moving body can be restrained from rotating around the turning of the feed screw when the feed screw turns, and the moving body guides the moving body along the longitudinal direction of the feed screw. Anything is acceptable. For example, the moving body may be in contact with the inner surface of the case, and when the feed screw is turned, the moving body may slide with respect to the case. In addition, the moving body is loosely fitted in the case, and when the feed screw turns, the moving body contacts and engages with the inner surface of the case, and the moving body is prevented from being rotated along the turning of the feed screw. You may do.

  As shown in FIGS. 1 to 5, the knock pin removing jig 100 according to the embodiment includes a moving body 110, a feed screw 130, and a case 150. The feed screw 130 is a male screw-like member, and a commercially available bolt or the like can be used as the feed screw 130. The moving body 110 includes an engaging portion 112 and a screwing portion 114, and is screwed with the feed screw 130 at the screwing portion 114. The case 150 is a frame that is open in the y direction. The case 150 includes a head support wall 156 that supports the head 132 of the feed screw 130, a leg support wall 158 that supports the leg portion 134 of the feed screw 130, a head support wall 156, and a leg support wall 158. And opposite side walls 152 and 154 that hold the moving body 110. The feed screw 130 passes through the head support wall 156 and the leg support wall 158 of the case 150 in the longitudinal direction (z direction shown in FIG. 1 and the like). The feed screw 130 is pivotally supported by the head support wall 156 and the leg support wall 158 of the case 150.

  As shown in FIG. 6, the screwing portion 114 of the moving body 110 has a substantially cylindrical through hole 114 a that penetrates the screwing portion 114 in the z direction. The inner surface of the through hole 114 a is connected to the feed screw 130. Screws are engraved so that they can be screwed together. The engaging portion 112 extends from the screwing portion 114 in a substantially U shape on both sides in the y direction. In the engaging portion 112, the size of the substantially U-shaped portion in the positive direction of the y-axis is different from the size of the substantially U-shaped portion in the negative direction of the y-axis, and can be engaged with male screws of different sizes. The engaging portion 112 and the screwing portion 114 are fixed to each other, and slidably contact the side walls 152 and 154 of the case 150 at both end surfaces in the x direction.

  When the feed screw 130 turns in a state where the feed screw 130 and the through hole 114a of the screwing portion 114 are screwed together, the movable body moves along the longitudinal direction (z direction) of the feed screw 130 between the side wall 152 and the side wall 154. The entire 110 slides. When the feed screw 130 is turned in the direction in which the screw is tightened (clockwise as viewed from the head 132 side), the moving body 110 moves in the direction of the head 132 of the feed screw 130 (the positive direction of the z axis). When the feed screw 130 is turned in the direction of loosening the screw (counterclockwise as viewed from the head 132 side), the moving body 110 moves in the direction of the leg portion 134 of the feed screw 130 (the negative direction of the z axis).

  As shown in FIG. 5, the leg support walls 158 of the case 150 are recessed in a substantially U shape on both sides in the y direction, and have a substantially H shape as a whole. The substantially U-shaped portions provided on both sides in the y direction of the leg support walls 158 are formed larger than the substantially U-shaped portions provided on both sides in the y direction of the engaging portion 112 of the moving body 110. . A hole 166 is provided at the center of the leg support wall 158, and the leg 134 of the feed screw 130 is inserted into the hole 166. Two extending portions extend from the center portion of the leg supporting wall 158 to both sides in the y direction. The leg support wall 158 has a support part 162 and four projecting parts 164a to 164d. The support part 162 supports the leg part 134 of the feed screw 130. The protrusions 164a to 164d protrude in the negative direction of the z-axis from the four corners of the leg support wall 158, and are provided at positions that become the tips of the extension portions. The protrusions 164a to 164d protrude below the support part 162 (in the negative direction of the z-axis) by about 0.1 mm to 0.2 mm.

  A method of pulling out the knock pin 300 fitted and held on the workpiece 500 using the knock pin removing jig 100 will be described with reference to FIGS. The case where the overall length of the knock pin 300 in the longitudinal direction (z direction shown in FIG. 7 and the like) is 80 mm and the overall length of the knock pin removing jig 100 is 120 mm will be described as an example. In some cases, the positive direction of the z-axis shown in FIG.

  The knock pin 300 is provided with a female screw 310, and the male screw 400 can be screwed into the female screw 310. The total length of the male screw 400 is longer than the total length of the female screw 310. When the male screw 400 is screwed and fixed to the female screw 310, the head and the body are exposed from the knock pin 300 and extend. As the male screw 400, a screw diameter (for example, M5, M6, M8, etc.) may be selected and used according to the female screw 310, and commercially available bolts or the like that are widely used can be used.

  First, after fixing the male screw 400 to the female screw 310, the leg of the case 150 is moved in a state where the movable body 110 is moved to a position in contact with the leg support wall 158 of the case 150 as shown in FIGS. The body portion of the male screw 400 is inserted into the U-shaped recess of the portion support wall 158 and the engaging portion 112 in the y direction and is fitted. At this time, it is preferable that the head of the male screw 400 is engaged with the upper surface of the U-shaped end of the engaging portion 112. Further, the leg support wall 158 is in contact with the upper surface of the workpiece 500 at the projecting portions 164 a to 164 d and is separated from the upper surface of the workpiece 500 at the support portion 162.

  Next, while pushing the knock pin removing jig 100 against the workpiece 500 from above, as shown in FIGS. 9 and 10, the feed screw 130 is turned in the direction of tightening the screw to move the moving body 110 to the side walls 152 and 154 of the case 150. And slid upward while being held on the surface. Since the knock pin removing jig 100 is in contact with the upper surface of the workpiece 500 at the four protrusions 164a to 164d, when the feed screw 130 is turned, the protrusion 164a rotates to the opposite protrusion 164d with the protrusion 164a as the rotation center. A moment acts, and a static frictional force is generated between the upper surface of the workpiece 500 and the lower surface of the protruding portion 164d. Thereby, when the feed screw 130 is turned, the knock pin removing jig 100 can be prevented from sliding on the upper surface of the workpiece 500. In addition, since the case 150 is a frame body in which the y direction is opened, the case 150 can be operated while visually monitoring the state of the moving body 110 and the like in the process of extracting the knock pin 300 from the y direction. Further, if the feed screw 130 is turned in the direction in which the screw is loosened to separate the feed screw 130 and the moving body 110, the moving body 110 can be pulled out from the direction in which the frame body is opened and replaced.

  When the moving body 110 moves upward in a state where the head of the male screw 400 is engaged with the upper surface of the U-shaped end of the engaging portion 112, the pulling of the knock pin 300 is started. Further, when the feed screw 130 is turned, the moving body 110 moves further upward as shown in FIGS. As a result, the male screw 400 that engages with the engaging portion 112 of the moving body 110 moves upward, and the knock pin 300 that is screwed and fixed to the male screw 400 also moves upward. By moving only the moving body 110 upward, the knock pin 300 can be moved upward, and the total length of the knock pin removal jig 100 does not change before and after the knock pin 300 is pulled out.

  When the movable body 110 is moved upward by a total length of 80 mm of the knock pin 300, the knock pin 300 can be pulled out from the workpiece 500. For this reason, it is sufficient if the work space is about 130 mm from the upper surface of the workpiece 500 (about 10 mm longer than the total length 120 mm of the knock pin removing jig 100). When the entire knock pin removing jig is moved upward as in the conventional case, the knock pin is pulled out, and at least 200 mm, which is the total value of the entire length of the knock pin (for example, 80 mm) and the knock pin removing jig (for example, 120 mm), must be secured. was there. If the knock pin removing jig 100 of this embodiment is used, the working space can be greatly reduced. If the knock pin 300 is removed from the engaging portion 112 and the feed screw 130 is turned in the direction of loosening the screw, the movable body 110 can be moved to a position in contact with the leg support wall 158 of the case 150. Returning to the state where the knock pin 300 can be pulled out.

  As described above, according to the knock pin removing jig 100 of the embodiment, the male screw 400 inserted into the knock pin 300 with the female screw can be easily engaged with the engaging portion 112 of the moving body 110 from the y direction. In addition, when an abnormality is recognized in the middle of pulling out the knock pin 300, the male screw 400 can be easily detached from the engaging portion 112 and the operation can be interrupted. Further, if the feed screw 130 is turned in the direction in which the screw is loosened to separate the feed screw 130 and the moving body 110, the moving body 110 may be pulled out and replaced from the direction in which the case 150, which is a frame, is opened. it can.

  Further, according to the knock pin removing jig 100, the workpiece 500 receives a strong impact when the knock pin 300 is pulled out because the knock pin 300 is pulled out while the moving body 110 is gently moved upward by turning the feed screw 130. Fluctuation can be suppressed. Further, since the knock pin 300 can be pulled out by moving only the moving body 110, it is not necessary to secure a work space in view of the length of the knock pin 300.

DESCRIPTION OF SYMBOLS 100: Knock pin extraction jig | tool 110: Moving body 112: Engagement part 114: Screwing part 130: Feed screw 132: Head 134: Leg part 150: Case 152,154: Side wall 156: Head support wall 158: Leg part Support wall 162: Support part 164a-164d: Protrusion part 300: Knock pin 400: Male screw 500: Workpiece

Claims (3)

A moving body including an engaging portion and a screwing portion that engage with a head portion of a male screw inserted into a female threaded knock pin;
A feed screw that is screwed with a screwed portion of the movable body;
A case that rotatably supports the head of the lead screw and that accommodates the movable body in a longitudinal direction of the lead screw between the head and the leg of the lead screw;
A knock pin removal jig comprising   The case includes a head support wall that supports a head of the feed screw, a leg support wall that supports a leg portion of the feed screw opposite to the head support wall, the head support wall, and the The knock pin removing jig according to claim 1, wherein the knock pin removing jig is a frame body that extends between leg support walls and has opposing side walls that hold the movable body.   The knock pin removing jig according to claim 2 or 3, wherein the leg support wall of the case includes a support part for supporting the leg part of the feed screw and protrusions protruding from four corners of the leg support wall.

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