JPH0544472U - Dowel pin removal device - Google Patents

Abstract

(57) [Summary] [Structure] A jack member 2 is screwed into an internal screw 11 provided on the inner peripheral surface of the leg member 1, and a screw portion 31 is provided at one end of a through passage 22 at the center of the jack member 2. The extraction rod 3 having the engaging portion 32 at the other end is penetrated. The screw portion 31 is set so as to engage with the screw hole 41 on the end surface of the knock pin 4, and the engaging portion 32 is set so as to engage with the seat surface 23 of the jack member 2. Then, when the jack member 2 is rotated from the set state and is raised, the ascending force is increased by the locking portion 32.
Acts on the knock pin 4 via the rod 3 to pull out the knock pin 4 from the knock hole 53. [Effect] Since a large pulling force can be applied to the knock pin by rotating the jack member with a relatively small force, the knock pin can be easily pulled out.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a knock pin extracting device that pulls out a knock pin from a knock hole.

[0002]

[Prior Art]

 For example, in the case of a trimming die that punches a metal plate into a desired shape, a configuration is used in which the trimming blade is made of a different material from the other parts, and this is positioned on the die body with a knock pin and screwed. .. Therefore, in order to remove the trimming blade for replacement or adjustment, it is necessary to pull out the knock pin. In this case, conventionally, the rod was inserted into the hollow cylindrical hammer member and provided at one end of the rod. After the threaded portion is screwed into the threaded hole at the end of the knock pin, the hammer member is caused to collide with the engaging portion bulged on the other end side of the rod, and the knocking force pulls out the knock pin.

[0003]

[Problems to be solved by the device]

 In the above-mentioned conventional type, the operator must continue to collide the hammer member with the engaging portion until the knock pin comes off, and especially when pulling the knock pin upward, move the hammer member, which is a heavy object, upward. A collision must be made and the worker must exert a great deal of force. Further, since such a large force is required, if the extraction work has to be performed in a state where the scaffolding such as the mold is unsatisfactory, the worker may lose his posture at the moment when the knock pin comes out.

In view of the above problems, an object of the present invention is to provide a knock pin extracting device that can extract the knock pin with a small force.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a knock pin extracting device for pulling out a knock pin from a knock hole. A jack member having a hollow cylindrical shape is screwed, and a hollow portion of the jack member has a threaded portion at a lower end that is screwed into a screw hole provided at an end surface of the knock pin and an upper end engaged with an upper end surface of the jack member. It is characterized by having inserted the extraction rod provided with the engaging part to match.

[0006]

[Action]

 Since the leg member is erected at the opening of the knock hole, when the jack member is rotated to raise the jack member, the ascending force acts as a pulling force from the engaging portion to the knock pin via the rod. Since this pulling-out force is generated by the screw that engages the leg member and the jack member, the turning force for the jack member is amplified and acts on the knock pin.

[0007]

【Example】

 Referring to the drawing, reference numeral 1 denotes a cylindrical leg member, which is provided with an inner screw 11 on its inner peripheral surface and a leg portion 12 at one end, and is stable even on a slightly uneven surface. It is configured to stand. Inside the leg member 1, a jack member 2 having an outer screw 21 which is screwed onto the inner screw 11 is disposed on the outer peripheral surface. A through passage 22 is bored in the center of the jack member 2, and a seat surface 23 having a self-lubricating member fitted is formed on an end surface opposite to the direction in which the leg portion 12 is provided. Has been. An engaging surface 24 is formed on the outer periphery of the seat surface 23 for engaging a tool (not shown) for rotating the jack member 2. A through rod 22 having a threaded portion 31 at one end and an engaging portion 32 at the other end is passed through the through passage 22, and the threaded portion 31 at one end is engaged with the screw hole 41 on the end face of the knock pin 4. The engaging portion 32 at the other end is set so as to engage with the seat surface 23. The knock pin 4 is for positioning when a member 51 such as a trimming blade is attached to the base 52, and is fitted across both the member 51 and a knock hole 53 provided in the base 52. When the jack member 2 is rotated from the state shown in the figure to raise the jack member 2, the ascending force acts on the knock pin 4 from the locking portion 32 via the rod 3 to move the knock pin 4 into place. It can be pulled out from the knock hole 53.

By the way, in the case of the present embodiment, the self-lubricating member is fitted on the seat surface 23 so that the rod 3 does not rotate even if the jack member 2 is rotated. The spiral direction and pitch of the outer screw 21 can be freely set. However, when the rod 3 is also rotated with the rotation of the jack member 2, the pitch of the outer screw 21 is set by the pitch of the screw portion 31. It may be increased or a left-hand thread opposite to the spiral direction of the threaded portion 31 may be used. Although the seat surface 23 is fitted with the self-lubricating member in this embodiment, a normal thrust bearing may be mounted.

[0009]

[Effect of the device]

 As is clear from the above description, in the present invention, since the pulling out force of the knock pin is generated by the screw that engages the leg member and the jack member, it is possible to increase the force by rotating the jack member with a relatively small force. Since the pulling force can be applied to the knock pin, the work of pulling out the knock pin becomes easy, and even if the scaffolding for pulling out is a little bad, the worker will not lose his posture at the moment when the knock pin comes off.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of the present invention.

[Explanation of symbols]

 1 Leg member 2 Jack member 3 Rod 4 Knock pin 12 Leg part 23 Seat surface 32 Locking part 41 Screw hole

Claims (1)

[Scope of utility model registration request] 1. A knock pin removing device for pulling out a knock pin from a knock hole, wherein a hollow cylindrical jack member having a threaded portion on an inner peripheral surface of a cylindrical leg member which is erected at an opening portion of the knock hole and an outer peripheral surface thereof. A hollow portion of the jack member, the lower end of which is provided with a screw portion which is screwed into a screw hole provided in the end face of the knock pin and the upper end of which is an engaging portion which engages with the upper end face of the jack member. A knock pin extracting device characterized by inserting a extracting rod.