JPS5845017Y2 - Extraction tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pulling tool used to pull out a component fitted to a shaft.

A conventionally known extraction tool is one in which a claw is hooked on the outer periphery of a part to be extracted, and the claw is moved in the axial direction by a threaded shaft using a shaft as a reaction force receiver.

However, such extraction tools cannot be used when there is not enough space around the outer circumference of the part to hook the claws, and the extraction work in such cases is extremely time-consuming.

The purpose of the present invention is to provide an extraction tool that can easily pull out a part even if there is no space around the outer circumference of the part if there is space around the outer circumference of the boss part for fitting the part to the shaft. do.

An embodiment of the present invention will be described below based on the drawings.
It is a pressure receiving plate, and the screw shaft 2 is screwed through the center of the plate and the button is pressed.
A contact member 4 is attached to one end 2a of the screw shaft 2 via a bearing 3 so as to be rotatable relative to the screw shaft.

The abutting member 4 is formed into a U-shaped cross section so as to be externally fitted onto the end of the shaft a on which the part to be pulled out is fitted, and to come into contact with the end surface.

The other end 2b of the screw shaft 2 is formed as a rotation operation section.

A plurality of connecting rods 5 extending in the axial direction of the screw shaft 2 are inserted around the pressure receiving plate 1. Saw-blade shaped unevenness 5a is formed on the outer surface, and a locking pawl 6 is attached to the pressure receiving plate 1, which can be engaged with and released from the unevenness 5a.

Reference numeral 7 denotes a cylindrical body attached to one end of the connecting rod 5, and a tapered surface 8 is formed on the inner periphery of one end 7a, the diameter of which decreases toward the extended position of the one end, and the connecting rod 5 is attached to the cylindrical body. A small diameter cylindrical guide surface 9 is formed on the end side.

The cylindrical guide surface 9 includes a grip tube 1 that loosely fits around the outer periphery of the shaft a.
0 is fitted to be slidable in the axial direction.

Reference numeral 11 denotes a locking key 12 of the gripping tube 10, which is a nut for preventing removal.

Claw body support members 13 are provided that extend from multiple locations in the circumferential direction on the outside of one end of the gripping tube 10 in the axial direction toward the one end extended position.

A groove 13 penetrating in the radial direction is provided at the tip of the claw support member 13.
a is provided in the groove, and the radially outer end thereof is the tapered surface 8.
The pawl body 1 is formed with a saw-blade-like engagement tooth portion 15 that engages with the outer surface of the boss portion of the part to be pulled out at the radially inner end thereof.
4 are arranged, and the claw body 14 is rotatably supported by a pin 16 passing through the middle portion and the claw body support member 13.

Reference numeral 17 denotes a spring interposed between the outer end of the claw body 14 and the claw support member 13 in order to always bias the claw body 14 into the engaged position.

Next, to explain the operation, after setting the position of the pressure receiving plate 1 to a large size with respect to the connecting rod 5 according to the length of the shaft a, the cylindrical body 7 is inserted into the outside of the boss part of the part to be pulled out. At the same time, the abutting member 4 is brought into approximate contact with the end of the shaft a, and the gripping cylinder 1
Push 0 towards the boss part.

Then, the tip of the claw body support member 13 at one end of the grip cylinder 10 enters the outside of the boss portion, and the claw body 14 is rotationally biased by the spring 17, so that the engaging teeth 15 thereof are pressed against the outer surface of the boss portion. engage.

Next, when the screw shaft 2 is rotated, the pressure receiving plate 1 moves in a direction away from the end of the shaft a, and the connecting rod 5 and the cylindrical body 7 are accordingly pulled toward the end of the shaft a.

Then, since the tapered surface 8 on the inner periphery of one end of the cylindrical body 7 is engaged with the claw body 14, the claw body 14 is not pressed so that its engagement tooth portion 15 further engages with the boss portion of the part. The cylindrical body 7 and the parts are integrally connected via the claw body 14.

Thus, as the cylindrical body 7 moves due to the rotational operation of the screw shaft 2, the component part moves with respect to the axis a, and the part part is pulled out from the axis a.

According to the extraction tool of the present invention, as is clear from the above description, even if there is no space around the outer periphery of the part to be pulled out, the part can be easily pulled out simply by having a space around the outer periphery of the boss part of the part. It can be removed.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a partially sectional front view, FIG. 2 is a view taken along the ■-■ arrow in FIG. 1, and FIG. 3 is a view taken along the ■-■ arrow in FIG. be. 1... Pressure receiving plate, 2... Screw shaft, 4... Contact member,
5... Connecting rod, 7... Cylindrical body, 8... Tapered surface,
10... Gripping tube, 13... Claw support member, 14...
・Claw body, 15... Engaging tooth portion, 16... Pin 17.
・Spring.

Claims (1)

[Scope of utility model registration request] A plurality of connecting rods each having a cylindrical body attached to one end are fixed around a pressure receiving plate having a screw shaft screwed through the center thereof, and a diameter is set on the inner periphery of one end of the cylindrical body toward the extended position. A gripping cylinder is provided that has a tapered surface and is movable in the axial direction within the cylindrical body, and at one end of the gripping cylinder, a radially outer end engages with the tapered surface and a radially inner end engages with the gripping cylinder. An extraction tool characterized by having a plurality of rotatably provided claw bodies each having a tooth portion.