JPH0418775Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) This invention relates to a pin extraction tool used for extracting various pins including parallel pins, tapered pins, etc.

(Prior Art) As this type of pin extraction tool, there is, for example, the one of Utility Model Publication No. 51-1120. As shown in FIG. 5, the model with the same number has a threaded part 4 at the tip of a drawing rod 2 into which a hammer member 1 is fitted, and a cap nut 5 is screwed into the threaded part 4 and tightened. 6 and fix it by pressing it. Then,
By removing the cap nut 5, a damaged bolt 6 can be easily replaced.

(Problems to be Solved by the Invention) However, in the conventional extraction tool as described above, the extraction bolt 6 is directly pressed and fixed by the threaded end 4 of the extraction rod 2, so the following method is required. A problem arose.

That is, the impact vibration when pulling out the pins is transmitted to the cap nut 5, and the cap nut 5 gradually rotates in the direction of unscrewing from the threaded portion 4, and the bolt 6 is removed by pulling out only a few pins. The tightening of the nut 5 became loose, and the nut 5 had to be tightened again in the middle of the pulling operation.

The object of this invention is to provide a pin extraction tool that does not cause loosening of the extraction bolt during pin extraction work and can be easily replaced even if the bolt is damaged.

(Means for Solving the Problems) The pin extraction tool according to this invention has the following configuration in order to achieve the above object.

It consists of a pull-out rod that has a removable pin pull-out part on the distal end side and an impact receiver on the proximal end side, and a hammer member that is fitted into the pull-out rod so as to be able to move up and down. The pin extraction part includes a bottomed cylindrical body that is removably attached to the tip side of the extraction rod by pin connection using a connecting pin, and a threaded part that protrudes from a through hole formed in the bottom of this bottomed cylindrical body. , and a pull-out bolt housed in the same cylindrical body. This pull-out bolt is then tightened and fixed by a screw member that is screwed into a screw hole formed in the cylindrical body and is not in contact with the pull-out rod.

(Example) Hereinafter, an example of this invention will be described based on the drawings.

In FIG. 1, the pull-out rod 11 has a shock receiver 13 fixed to its base end with a bolt 12, and has a pin hole 14 penetrating in a direction perpendicular to the axial direction at its tip end. . A hammer member H having a flange 15 at one end is fitted into the pull-out rod 11 so as to be movable up and down.

On the other hand, a pin pull-out part 16 is detachably attached to the tip side of the pull-out rod 11.

As clearly shown in FIG. 2, the pin extraction part 16 includes a bottomed cylindrical body 17 that is removably fitted and attached to the distal end side of the extraction rod 11 by pin connection.
It consists of a pull-out bolt 18 that is inserted into the cylindrical body 17 and a screw member 19 that tightens and fixes the bolt 18.

The cylindrical body 17 is connected to the pull-out rod 11.
The fitting hole 20 into which the tip of the fitting hole 2 is fitted, and the fitting hole 2 thereof
0, a pin insertion hole 22 is provided on the peripheral side thereof, and a through hole 23 is provided on the bottom thereof. Therefore, when the bolt 18 is inserted into the cylindrical body 17 and its threaded portion 24 is projected from the through hole 23, the threaded member 19 is screwed into the threaded hole 21 and tightened and fixed. At this time, the screw member 19
The bolt 18 is tightened and fixed so that it does not contact the pull-out rod 11, that is, a gap is formed between the upper surface of the screw member 19 and the lower surface of the pull-out rod 11.

In this way, the tip of the pull-out rod 11 is fitted into the insertion hole 20 of the cylindrical body 17, and when the pin hole 14 and the pin insertion hole 22 are positioned so as to communicate with each other, the connecting pin 25 is inserted, and then the pull-out rod 11 is pulled out. The part 16 is attached to the pull-out rod 11.

Note that 26 is a knob for the pin 25, and 27 is a wrench for tightening the screw member 19.

Now, to explain how to handle the extraction tool having such a configuration, the bolt 18 attached to the tip of the tool is screwed into the female thread of the pin to be extracted, and the hammer member H is moved upward and struck against the impact receiver 13. By repeating this operation several times, the pin can be pulled out by the reaction force of the hammer impact.

The vibration caused by the impact of the hammer causes the pulling part 16 to
However, the cylindrical body 17 is non-rotatably attached to the pull-out rod 11 by the connecting pin 25, and furthermore, the pull-out rod 11 and the screw member 19 are in a non-contact state. Therefore, vibrations are not directly transmitted to the threaded member 19, and the bolt 18 will not become loosened.

If the bolt 18 is damaged, pull out the pin 25, remove the pull-out part 16, and remove the screw member 1.
Remove 9 and replace the bolt.

Further, the pull-out portion 16 is replaced as appropriate depending on the diameter of the female thread of the pull-out pin.

That is, a plurality of pull-out parts 16 are prepared in advance, bolts 18 having different thread diameters are attached to the bolts 18, and an appropriate pull-out part 16 is selected depending on the size of the pin to be pulled out. Note that each cylindrical body 17 constituting the plurality of pull-out portions 16 is
Naturally, the diameters of the screw hole 21 and the through hole 23 are different, but the diameter of the insertion hole 20 is constant.

FIG. 3 shows a second embodiment of this invention, which differs from the first embodiment in that a connecting pin 28 attached to the tip of the pull-out rod 11 connects the pull-out rod 11 to the pull-out section. 16 is connected by pin. In other words, like the bayonet joint method,
A groove hole 2 cut out in an inverted L shape at the upper end of the cylindrical body 17
9 is provided, and the connecting pin 28 is inserted into the groove hole 29 and latched, so that the attachment portion 16 can be attached.

With such a mounting structure, the pull-out portion 16 can be easily attached and detached.

Next, FIG. 4 shows a third embodiment of this invention, which is characterized in that the pull-out part 16 can be attached and detached with one touch.

First, the pull-out rod 11 is provided with an enlarged-diameter mounting portion 30 at its tip, and a pull-out extension rod 32 for connection can be inserted into a mounting hole 31 formed in the axial direction.
The pull-out extension rod 32 has a pin hole 33 at its lower end that communicates with the pin insertion hole 22 of the cylindrical body 17, and an engagement groove 34 having a semicircular cross section at the outer periphery of its upper end.
Equipped with Therefore, the connecting pin 2 is inserted into the pin hole 33.
5 is inserted, and a pull-out part 16 can be detachably attached to the lower end thereof.

On the other hand, on the side circumferential portion of the mounting portion 30, there is a penetration hole having approximately the same diameter as the engagement groove 34, which penetrates the attachment hole 31 and leads to the engagement groove 34 of the pull-out extension rod 32 inserted into the attachment hole 31. A hole 35 is formed. A steel ball 36 is inserted into the through hole 35 to connect the pull-out extension rod 32 to the attachment portion 30 by engaging with the engagement groove 34.

In addition, a movable cylindrical body 38 that is vertically movable is fitted into the mounting portion 30 and has a steel ball relief groove 37 with a semicircular cross section and approximately the same diameter as the through hole 35 near the lower end of the inner circumference. do. Reference numeral 39 is a stopper attached to the pull-out rod 11 in order to restrict the upward movement of the cylindrical body 38.

Thus, as shown by the arrow in the figure, the cylindrical body 38
The pull-out part 16 can be attached and detached with one touch by moving up and down.

That is, if the cylindrical body 38 is slightly lifted upward,
Relief groove 37 formed on the inner circumference of the cylindrical body 38
and the through hole 35 of the mounting portion 30 communicate with each other, and the steel ball 3
6 escape holes are formed. Therefore, if the pull-out portion 16 is pulled down while the cylindrical body 38 is lifted, the engagement between the steel ball 36 and the pull-out extension rod 32 is released, and the pull-out portion 16 can be removed from the pull-out rod 11 as it is. .

On the other hand, when installing the pull-out part 16,
In the same manner as described above, with the cylindrical body 38 lifted, insert the pull-out extension rod 32 into the mounting portion 30, and connect the engagement groove 34 of the pull-out extension rod 32 with the through-hole 3 of the attachment portion 30.
5, the cylindrical body 38 is released. Then, as the cylindrical body 38 descends, the through hole 3
The escape hole of the steel ball 36 formed between the steel ball 36 and the steel ball 5 disappears,
Moreover, the steel ball 36 rolls into engagement with the engagement groove 34, thereby preventing the pull-out extension rod 32 from falling off.

(Effects of the invention) The pin extraction tool according to the invention includes a bottomed cylindrical body in which the pin extraction part is removably attached to the tip side of the extraction rod by pin connection using a connecting pin;
The threaded portion protrudes from a through hole formed at the bottom of the bottomed cylindrical body, and a draw bolt is housed in the cylindrical body. Screw together.
The pull-out rod is tightened and fixed by a screw member that is not in contact with the pull-out rod.

Therefore, even if vibrations due to hammer impact are transmitted to the bottomed cylindrical body of the pull-out section, the cylindrical body cannot rotate due to the pin connection, and furthermore, the pull-out rod and the screw member that tightens the pull-out bolt are Since it is in a non-contact state, vibrations are not directly transmitted to the screw member, and therefore the pull-out bolt will not become loosened.

In addition, if the pull-out bolt is damaged or the diameter of the female thread of the pin to be pulled out changes, the bolt can be replaced by releasing the pin connection and removing the pull-out part, and then replace the bolt to match the female thread. It can be replaced with a pull-out part equipped with a pull-out bolt.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of one embodiment of a pin extraction tool according to this invention, Fig. 2 is an exploded perspective view of the pin extraction part, and Figs. 3 and 4 are respective examples of other embodiments of this invention. A partially omitted front view, a partially omitted cross-sectional view, and FIG. 5 are cross-sectional views showing a conventional pin extraction tool. 11... Pulling rod, 13... Shock receiver, 16...
... Pin extraction part, 17 ... Bottomed cylindrical body, 18 ...
Pull-out bolt, 19... Threaded member, 21... Threaded hole, 23... Through hole, 24... Threaded part, 25, 2
8...Connection pin, H...hammer member.

Claims (1)

[Claims for Utility Model Registration] 1. Consisting of a pull-out rod with a removable pin pull-out part on the distal end and an impact receiver on the base end, and a hammer member that is fitted into the pull-out rod so as to be able to move up and down. In the pin extraction tool, the pin extraction part includes a bottomed cylindrical body that is removably attached to the tip side of the extraction rod by pin connection with a connecting pin, and a threaded part from a through hole formed in the bottom of the bottomed cylindrical body. and a pull-out bolt housed in the cylindrical body so as to protrude, and the pull-out bolt is screwed into a screw hole formed in the cylindrical body by a threaded member that is not in contact with the pull-out rod. A pin extraction tool that is tightened and fixed. 2. The pull-out rod has an enlarged-diameter mounting portion at its tip, and the pin pull-out portion is removably attached to the lower end of the mounting hole formed in the axial direction of the mounting portion, and a cross-section is provided on the outer periphery of the upper end. A pull-out extension rod for connection, which is provided with a semicircular engagement groove, can be inserted thereinto, and a side circumferential portion of the enlarged diameter attachment portion is provided with a pull-out extension rod that penetrates the attachment hole and is inserted into the attachment hole. A through hole that communicates with the engagement groove of the pull-out extension rod and has approximately the same diameter as the engagement groove is formed, and the pull-out extension rod is inserted into the through hole by engaging with the engagement groove. A steel ball to be connected to the mounting portion is inserted, and the mounting portion is provided with a steel ball relief groove having a semicircular cross section and having approximately the same diameter as the through hole near the lower end of the inner periphery, and is movable up and down. The pin extraction tool according to claim 1, which is a utility model, and is formed by fitting a movable cylindrical body.