JP2016020018A - Knock pin removal tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a knock pin removal tool which prevents fingers from being caught thereby during carriage and operation.SOLUTION: A knock pin removal tool 5 is used to pick a knock pin 1 knocked into a workpiece from the workpiece and includes: a picking rod 8 including a connection member 6, which is connected with the knock pin 1 at its tip, and a slide shaft 7 located at the other end side; a striking object block 9 which is provided at the other end of the slide shaft 7; and a cylindrical hammer 11 which covers the striking object block 9 and the slide shaft 7, is provided so as to slide relative to the slide shaft 7, and has a striking part 10 which is used to strike the striking object block 9 and located at a tip side inner periphery.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a knock pin removing tool for removing a knock pin driven into a workpiece such as a mold.

  As shown in FIG. 2A, a knock pin removing tool 30 for extracting the knock pin 1 driven into a work such as a mold 2 has a pulling bar 31 whose tip is connected to the knock pin 1, and a shaft on the outer periphery of the pulling bar 31. And a cylindrical hammer 32 that is slidable in the direction. On the other end side of the drawing bar 31, a flange 33 for allowing the cylindrical hammer 32 to collide is provided.

  As shown in FIG. 2 (b), the knock pin removing tool 30 is engaged with the knock pin 1 by screwing the extraction rod 31 into the knock pin 1, and then the cylindrical hammer 32 is slid to the other end side so as to collide with the flange 33. Thus, a pulling force is applied to the pulling bar 31 so that the knock pin 1 is pulled out from the workpiece.

JP-A-11-33929 JP 2006-326742 A JP 2004-58251 A

  By the way, the knock pin removing tool 30 collides the exposed barb 33 with the other end of the cylindrical hammer 32. Therefore, when the operator carries the knock pin removing tool 30 or works, There is a possibility that fingers may be pinched between the hammer 32 and there is room for improvement in safety.

  Further, when the extraction rod 31 is screwed and connected to the knock pin 1, the cylindrical hammer 32 is rotatable with respect to the extraction rod 31, so that the extraction rod 31 can be held only by holding the cylindrical hammer 32 with one hand. I couldn't turn it.

  Further, since the pulling bar 31 penetrates the cylindrical hammer 32, the knock pin removing tool 30 is long and heavy, and it is difficult to hold it with one hand. For this reason, it has been necessary to work while supporting the knock pin removing tool 30 with both hands.

  An object of the present invention is to provide a knock pin removing tool that can prevent fingers from being pinched during transportation or work.

  In order to achieve the above-mentioned object, the present invention provides a knock pin removing tool for extracting a knock pin driven into a workpiece from a workpiece, the tip having a connecting member connected to the knock pin and a slide shaft on the other end side. A pull-out rod, a hit block provided at the other end of the slide shaft, a cover block covering the hit block and the slide shaft and slidable with respect to the slide shaft, and on the tip side inner periphery A cylindrical hammer having a striking portion for colliding with the striking block.

  According to the present invention, it is possible to prevent fingers from being pinched during transportation or work.

It is sectional explanatory drawing of the knock pin removal tool which concerns on one embodiment of this invention, (a) is the state which has a cylindrical hammer in the front end side, (b) looked at (a) from the AA line arrow direction. State (c) shows a state in which the cylindrical hammer collides with the hit block. It is sectional explanatory drawing of the conventional knock pin removal tool, (a) shows the state which has a cylindrical hammer in the front end side, (b) shows the state which the cylindrical hammer collided with the scissors.

  Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a diagram for explaining a state in which knock pins that have been driven into upper and lower dies are removed with a knock pin removing tool. FIG. 1A shows a state in which the cylindrical hammer is positioned at the lower end of its movable range, and FIG. 1C shows a state in which the cylindrical hammer is slid upward to collide with the hit block. . In the present embodiment, the lower side is the tip direction of the knock pin removing tool, and the upper side is the other end direction of the knock pin removing tool.

  As shown in FIG. 1 (a), the knock pin 1 is used to join adjacent dies 2, and the dies 2 are driven by being driven into a driving hole 3 formed in communication with each of the dies 2. Join. The knock pin 1 is formed in a cylindrical shape, and a female screw 4 is formed on the inner periphery.

  The knock pin removing tool 5 has a connecting member 6 whose lower end (front end) is connected to the knock pin 1, and a pulling bar 8 having a slide shaft 7 on the upper end side (the other end side), and an upper end of the slide shaft 7. The hit block 9, and the hit block 10 for covering the hit block 9 and the slide shaft 7 and being slidable with respect to the slide shaft 7 and for colliding with the hit block 9 on the inner periphery of the tip end side. A cylindrical hammer 11 is provided.

  The pull-out bar 8 includes a bolt-shaped connecting member 6 that is screwed to the knock pin 1, a bar-shaped receiving holder 12 that is arranged coaxially with the connecting member 6 and receives the upper end of the connecting member 6, and the connecting member 6 and the receiving holder 12. And the slide shaft 7 which is arranged coaxially with the receiving holder 12 and is connected to the upper end of the receiving holder 12.

  The connecting member 6 has a non-circular head 14 in plan view, and is non-rotatably fitted with an adapter 13 described later.

  The receiving holder 12 includes a male screw portion 15a formed on the lower end side and abutted against the head portion 14 of the connecting member 6, and a holder main body 16 formed to extend upward from the upper end of the male screw portion 15a. The male screw portion 15 a is formed with a larger diameter than the head portion 14 of the connecting member 6. The holder main body 16 is formed in a rod shape having a larger diameter than the male screw portion 15a and a larger diameter than the slide shaft 7 described later. As a result, the center of gravity of the knock pin removing tool 5 is lowered to increase the stability during operation. Further, an upper end portion of the holder body 16 is formed with a female screw portion 17 b for coupling with the slide shaft 7.

  The adapter 13 is formed in a cylindrical shape. The adapter 13 has a female screw portion 15b that is screwed with the male screw portion 15a of the receiving holder 12 in the upper portion, and has a head accommodating portion 18 that accommodates the head portion 14 of the connecting member 6 in the lower portion. The head accommodating portion 18 is formed such that the inner peripheral surface thereof is fitted to the head 14 of the connecting member 6 so as not to rotate. Further, the head accommodating portion 18 is formed with a reduced diameter portion 20 through which the male screw portion 19 a of the connecting member 6 is inserted and in contact with the lower surface of the head 14. The adapter 13 is screwed to the male screw portion 15a of the receiving holder 12 so that the head portion 14 of the connecting member 6 is sandwiched between the reduced diameter portion 20 and the male screw portion 15a of the receiving holder 12 so as to be fixed. It has become.

  The slide shaft 7 is formed in a rod shape having substantially the same diameter from the lower end to the upper end. At the lower end of the slide shaft 7, a male screw portion 17 a that is screwed with the female screw portion 17 b of the holder main body 16 is formed. Further, the male screw portion 17a is formed longer in the axial direction than the female screw portion 17b of the holder body 16, and the upper portion protrudes from the female screw portion 17b and is exposed. A stopper block 21 for receiving the cylindrical hammer 11 is provided on the male screw portion 17a protruding from the female screw portion 17b. The stopper block 21 is composed of a pair of upper and lower nuts formed in a block shape. Further, between the stopper block 21 and the holder body 16, a buffer member 22 for absorbing the momentum of the cylindrical hammer 11 by contacting the cylindrical hammer 11 when the cylindrical hammer 11 contacts the stopper block 21. Is provided.

  The buffer member 22 is formed of a coil spring, and a lower end thereof is seated on a receiving seat 23 formed on the upper end of the holder body 16, and an upper end thereof is brought into contact with the lower surface of the stopper block 21. The buffer member 22 is disposed between the holder body 16 and the stopper block 21 in a compressed state. The buffer member 22 is formed to have a large diameter so as to protrude outward in the radial direction from the stopper block 21, and receives the cylindrical hammer 11 on the outer periphery of the upper end portion protruding from the stopper block 21. The buffer member 22 is not limited to a coil spring. For example, the buffer member 22 may be made of a soft resin or the like.

  As shown in FIGS. 1 (a) and 1 (b), the hit block 9 is for receiving a hit in the knock pin removal direction from the cylindrical hammer 11, and is formed in a cylindrical shape and has an elliptical outer peripheral shape. Is formed. The hit block 9 is welded to the upper end portion of the slide shaft 7 after being screwed with a male screw (not shown) formed at the upper end portion of the slide shaft 7, and is firmly fixed to the slide shaft 7. Yes.

  In addition, although the to-be-struck block 9 shall be formed in elliptical outer periphery shape, it is not restricted to this. The hit block 9 only needs to be non-rotatable with respect to a cylindrical hammer 11 described later, and the outer peripheral shape only needs to be noncircular.

  The cylindrical hammer 11 includes a cylindrical part 24 formed in a cylindrical shape surrounding the outer periphery of the hit block 9, a striking part 10 provided at the lower end part of the cylindrical part 24, and a lower end part of the cylindrical part 24. A cover portion 25 is provided that extends downward from the striking portion 10 and covers the stopper block 21 when it is moved downward.

  The cylindrical part 24 is formed in a shape (oval shape) whose inner peripheral shape follows the outer peripheral shape of the hit block 9 and is not rotatable with respect to the hit block 9. In addition, a knurling process is performed on the outer periphery of the cylindrical portion 24 to stop the finger from slipping, and an anti-slip groove 26 is provided. The anti-slip groove 26 is formed in an annular shape so that the operator's finger is hooked when the cylindrical portion 24 is gripped. Further, the cylindrical portion 24 above the anti-slip groove 26 is formed with an enlarged diameter portion 27 for preventing the hand holding the cylindrical portion 24 from coming off.

  The striking portion 10 is formed in a ring plate shape that extends radially inward from the inner peripheral surface of the cylindrical portion 24 and whose inner peripheral surface is in sliding contact with the outer peripheral surface of the slide shaft 7. When the striking part 10 is moved upward, it collides with the hit block 9 and strikes the extraction rod 8. Further, when the hitting portion 10 is moved downward, it comes into contact with the stopper block 21 and regulates the downward movement of the cylindrical hammer 11. That is, the position where the hitting portion 10 and the hit block 9 collide is the upper end position (collision position) of the movement range of the cylindrical hammer 11, and the position where the hitting portion 10 and the stopper block 21 abut is the position of the cylindrical hammer 11. This is the lower end position (standby position) of the movement range.

  The cover portion 25 is formed in a cylindrical shape coaxial with the cylindrical portion 24 and has an inner diameter larger than the stopper block 21 and smaller than an outer diameter of the buffer member 22. Further, the cover portion 25 has an axial length longer than that of the stopper block 21. When the cover portion 25 is moved downward, the outer peripheral portion of the buffer member 22 before the lower surface of the striking portion 10 comes into contact with the stopper block 21. At this time, the buffer member 22 is pushed and shrunk.

  A reinforcing pin 28 for preventing deformation of the cylindrical portion 24 is provided at the upper end portion of the cylindrical portion 24 so as to penetrate in the diametrical direction.

  Next, the operation of this embodiment will be described.

  When extracting the knock pin 1 from the driving hole 3 of the mold 2, first, the connecting member 6 of the knock pin removing tool 5 is screwed into the knock pin 1. At this time, the tip of the connecting member 6 is aligned with the female screw 4 of the knock pin 1 while holding the cylindrical hammer 11, and the cylindrical hammer 11 is rotated clockwise as it is. Since the hit block 9 in the cylindrical hammer 11 is not rotatable relative to the cylindrical hammer 11, the rotational force from the cylindrical hammer 11 is applied to the hit block 9, the slide shaft 7, the receiving holder 12 and the adapter 13. It is transmitted to the connecting member 6 via. Thereby, the connecting member 6 is screwed to the knock pin 1. The knock pin 1 and the knock pin removing tool 5 can be easily screwed together simply by operating the cylindrical hammer 11 with one hand.

  Thereafter, as shown in FIG. 1 (c), the cylindrical hammer 11 is vigorously pulled upward, and the striking portion 10 of the cylindrical hammer 11 is caused to collide with the hit block 9 of the pull-out bar 8. The extraction bar 8 is hit upward, and the knock pin 1 moves upward. At this time, the hit block 9 is positioned in the cylindrical hammer 11, and the cylindrical hammer 11 is merely slid upward from the pulling bar 8. There is no risk of fingers being caught, and work can be performed safely.

  Thereafter, the cylindrical hammer 11 is slid downward and then pulled up vigorously in order to strike the extraction rod 8 again. Thereafter, the knock pin 1 can be extracted from the mold 2 by repeating this operation. When the cylindrical hammer 11 is slid downward, there is a case where the momentum excessively hits the stopper block 21, but before that, the buffer member 22 hits the cylindrical hammer 11 and absorbs the momentum. Not receive. Also, when the lower surface of the hitting portion 10 of the cylindrical hammer 11 hits the stopper block 21, the cover portion 25 covers the outer periphery of the stopper block 21, so that there is no possibility that fingers will be caught between the lower surface of the hitting portion 10 and the stopper block 21. Can work safely.

  As described above, the knock pin removing tool 5 has the connecting member 6 whose tip is connected to the knock pin 1 and the pulling rod 8 having the slide shaft 7 on the other end, and the hit provided on the other end of the slide shaft 7. A cylindrical shape having a striking portion 10 that covers the block 9 and the striking block 9 and the slide shaft 7 and is slidable with respect to the slide shaft 7 and collides with the striking block 9 on the inner periphery on the tip side. Since the hammer 11 is provided, the hitting part 10 and the hit block 9 can be covered, and fingers can be prevented from being pinched during transportation or work. Further, the pulling bar 8 does not need to penetrate the cylindrical hammer 11, can be made shorter and lighter than the knock pin removing tool 30 shown in FIG. 2, and can be operated with one hand.

  The cylindrical hammer 11 has a cylindrical part 24 formed with a non-circular cross section, and the hit block 9 is formed with a non-circular cross section that cannot rotate with respect to the cylindrical part 24. By simply holding and rotating the hammer 11 with one hand, the connecting member 6 of the knock pin removing tool 5 can be screwed onto the knock pin 1 and workability can be improved.

  A stopper block 21 that restricts the sliding range of the cylindrical hammer 11 is provided on the distal end side of the slide shaft 7 so as to face the hit block 9, and the cylindrical hammer 11 is stopped at the distal end of the cylindrical hammer 11. Since the cover portion 25 that covers the stopper block 21 is formed when contacting the block 21, it is possible to prevent fingers from being pinched between the cylindrical hammer 11 and the stopper block 21.

  Since the slide shaft 7 is provided with the buffer member 22 that comes into contact with the cylindrical hammer 11 before the cylindrical hammer 11 and the stopper block 21 come into contact with each other, the sliding shaft 7 is pulled out when the cylindrical hammer 11 comes into contact with the stopper block 21. It is possible to prevent a downward impact from being applied to the rod 8, and the knock pin 1 can be extracted efficiently.

  Further, since the cylindrical hammer 11 is provided with the anti-slip groove 26 that stops the finger from slipping, the cylindrical hammer 11 can be easily adapted to the palm and the palm can be prevented from coming off the cylindrical hammer 11.

DESCRIPTION OF SYMBOLS 1 Knock pin 5 Knock pin removal tool 6 Connecting member 7 Slide shaft 8 Pull-out rod 9 Batter block 10 Strike part 11 Cylindrical hammer

Claims (5)

In the knock pin removing tool for removing the knock pin driven into the workpiece from the workpiece,
A pulling rod having a connecting member connected to the knock pin and having a slide shaft at the other end, a hit block provided at the other end of the slide shaft, and the hit block and the slide shaft are covered. A knock pin removing tool comprising a cylindrical hammer that is slidable with respect to the slide shaft and has a striking portion for colliding with the striking block on the inner periphery of the tip end side.   2. The knock pin according to claim 1, wherein the cylindrical hammer has a cylindrical portion formed in a non-circular cross section, and the hit block is formed in a non-circular cross section that is not rotatable with respect to the cylindrical portion. Punching tool.   A stopper block that restricts the sliding range of the cylindrical hammer is provided on the distal end side of the slide shaft so as to face the hit block, and the cylindrical hammer is disposed on the distal end of the cylindrical hammer. The knock pin removing tool according to claim 1 or 2, wherein a cover portion is formed to cover the stopper block when contacting the block.   The knock pin removing tool according to claim 3, wherein the slide shaft is provided with a buffer member that comes into contact with the cylindrical hammer before the cylindrical hammer and the stopper block come into contact with each other.   The knock pin removing tool according to any one of claims 1 to 4, wherein the cylindrical hammer is provided with a non-slip groove for preventing a finger from slipping.