JPH0985638A - Pin extracting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and quickly pull out a pin member by providing a rod travel piece for causing the head of a pin extraction rod to move in a direction for pulling out the pin member relative to a bolt head, when a hammering member is driven along the direction toward a pin coupling plane. SOLUTION: An outer cylinder 18 is gripped by one hand and the other hand is used to drive a hammering projection 21 formed on a hammering member 12 with a hammer Q toward the coupling direction B of a knock pin P. As a result, an impact due to hammering acts on the outer end 14c of a rod travel piece 14, thereby displacing the outer end 14C downward. At the same time, the inner end 14b of the travel piece 14 is displaced along a knock pin extracting direction. According to the displacement, a pin extracting rod 13 is caused to slide in the extracting direction thereof, together with a knock pin P, under impact. As a result, the knock pin P is pulled out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pin pulling tool for pulling out a pin member such as a knock pin used for positioning parts in molds and various machines.

[0002]

2. Description of the Related Art As a pin removing tool of this type,
9-5274 and Japanese Utility Model Laid-Open No. 59-5273. As shown in FIG. 7, the pin removing tool disclosed in Japanese Utility Model Laid-Open No. 59-5274 grabs a slider 2 fitted into a guide rod 1 directly with a hand and holds it by a stopper which is the head of the guide rod 1. The pin 4 is pulled out from the component 5 by impacting the pin 3 with the pin 3 in the pin pulling direction.

The pin removing tool described in Japanese Utility Model Laid-Open No. 59-5273 has a crank arm 6 as shown in FIG.
The spring 7 is compressed based on the rotational movement of the pin 7, the impact of the hammer 9 fitted on the shaft 8 is obtained by the compressive force of the spring 7, and the pin 10 is pulled out from the component 11.

[0004]

However, in the pin removing tool disclosed in Japanese Utility Model Laid-Open No. 59-5274,
Since the slider 2 is directly moved along the guide rod 1 in the pulling-out direction by hand, the physical load is large, the workability is not good, and it takes a long time to pull out. If the striking force of the slider 2 on the stopper tilts,
Since the bending force acts on the pin 4, there is a possibility that the pin 4 may be deformed or its female screw may be crushed.

Also, there is a risk that a hand or a part of the body will be caught between the slider 2 and the stopper 3,
When the pin 4 comes off, the momentum is too much, and the tool itself jumps up, which is unsafe.

In the pin removing tool described in Japanese Utility Model Laid-Open No. 59-5273, when the pin 10 is pulled out, the crank arm 6 is pushed down while the pin 9 is screwed onto the shaft 8.

However, since the crank arm 6 has a structure in which the crank arm 6 is largely projected to the side of the shaft 8,
During the work of pushing down the crank arm 6, the shaft 8
Is difficult to maintain in an upright posture, and bending force acts on the pin 10, which may deform or damage the pin 10. Further, there is a drawback that the number of parts is large and complicated, and it is difficult to reduce the manufacturing cost. Further, since the crank arm 6 is rotatably supported, there is a problem in strength at the supporting portion.

Therefore, an object of the present invention is to provide a pin removing tool which can be easily and quickly removed without deforming or damaging the pin member, and which is robust and has a simple structure.

[0009]

SUMMARY OF THE INVENTION According to the present invention, a bolt 17 having a through hole 17d through which a pin-pulling rod 13 is slidably inserted in an axial direction, and a male screw 17a of the bolt 17 are screwed with a female screw 18a. An outer cylinder 18 that can be screwed with respect to the bolt 17 and has one end abutting against the pin fitting surface Na into which the pin member P is fitted when the pin member P is pulled out.
And a striking member 12 mounted axially movably on the head 17c of the bolt 17, and between the striking member 12 and the head 17c of the bolt 17 is swingably supported by the head 17c. A rod moving piece for moving the head 13b of the pin extracting rod 13 in the extracting direction A of the pin member P relative to the head 17c of the bolt 17 when the tapping member 12 is tapped in the direction of the pin fitting surface Na. 14 and.

The head 17c of the bolt 17 is provided with a plurality of arcuate recesses 17e, and rod moving pieces 14 having a semicircular cross section are swingably fitted and supported in the respective heads 17c. Engages with the tapping member 12, and the other end 14b engages with the head 13b of the pin removing rod 13.

A male screw portion 19 at the tip of the pin removing rod 13
However, it is detachable from the pin removing rod 13.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described. 1 is an external perspective view of a pin removing tool according to an embodiment of the present invention, FIG. 2 is an exploded perspective view thereof, and FIG. 3 is FIG.
FIG. 4 is a sectional view taken along line I-I of FIG. 4, and FIG.

The pin removing tool of the present invention is made of metal,
Pin removal rod 13 with pin threaded portion PT attached at the tip
A holder H including a bolt 17 for slidably supporting the shaft in an axial direction thereof and an outer cylinder 18 fitted to the bolt 17 so as to be threaded.
Between the striking member 12 mounted on the upper part of the bolt 17 via the guide bolt 15 so as to be movable in the axial direction, and between the striking member 12 and the head 17c at the rear end of the bolt 17,
It has a plurality of rod moving pieces 14 rotatably supported on the head portion 17c (FIG. 2).

The pin removing rod 13 is a cylindrical shaft portion 13.
A disk-shaped head 13b is formed at the upper end of a. A female screw portion 13c for fixing the pin screwing portion PT is screwed on the lower end surface of the shaft portion 13a, and a slotted key groove 13d having a required length is formed on the upper end portion.

In the key groove 13d, a worm screw 16 which is screwed into a screw hole 17g provided in a bolt 17 described later is inserted to prevent the pin extracting rod 13 from rotating in the bolt 17.

The pin screwing portion PT has a male screw portion 19 screwed into the female screw portion Pa of the knock pin P and the pin removing rod 13.
And a screwing member 20 screwed into the female screw portion 13c.

The screwing member 20 is a bolt member formed around a bolt insertion hole 20a into which the male screw portion 19 is inserted. The total length L thereof is set shorter than the length of the shaft portion 19a of the male screw portion 19, and as shown in FIG.
When the shaft portion 19a of is inserted into the bolt insertion hole 20a,
The male screw portion 19 projects below the outer cylinder 18.

When the pin screwing portion PT is screwed into the female screw portion 13c, the head portion 19b of the male screw portion 19 is clamped and fixed between the upper wall 13e in the female screw portion 13c and the screwing member 20. To be done.

Since the screw member 20 and the male screw portion 19 are generally available in various sizes, they may be appropriately selected and used depending on the size of the female screw portion Pa of the knock pin P and the like. Good.

The bolt 17 has a disk-shaped head portion 17c at the rear end of a cylindrical body portion 17b having an external thread 17a formed on its outer peripheral surface.
A through hole 17d is formed in the center of the main body portion 17b for holding the pin-pulled rod 13 slidably in its axial direction.

On the upper surface of the head portion 17c, there are provided a plurality of arcuate concave portions (in this embodiment) for fittingly supporting the rod moving piece 14 swingably in the radial direction at equal angular intervals around the through hole 17d. 3) 17e is formed. Each rod moving piece 14 has a semicircular cross section in which the sliding contact surface 14a with the arcuate recess 17e is formed in an arc shape. Further, the arcuate concave portion 17e is formed with substantially the same curvature as the sliding contact surface 14a of the rod moving piece 14.

The inner ends (the other ends) 14b of the rod moving pieces 14 fitted in the arcuate recesses 17e abut on the lower surface of the head 13b of the pin removing rod 13, respectively.
Each outer end portion (one end portion) 14c is in a state of slightly protruding outward from the outer peripheral surface of the head portion 17c (FIG. 3).

Each arcuate recess 17e formed in the head 17c
A plurality of screw holes 17f into which the guide bolts 15 are screwed are formed at intervals at equal angular intervals around the through hole 17d. The guide bolt 15 supports the striking member 12 so as to be movable in a certain range in the axial direction of the pin-pulling rod 13.

The outer cylinder 18 is for adjusting the relative position of the bolt 17 with respect to the pin-pulling rod 13, and is of a cylindrical shape in which an internal thread 18a to be screwed into the external thread 17a on the outer peripheral surface of the bolt 13 is formed on the inner peripheral surface. A short tubular contact member 22 that contacts the component N is fixed to the lower end surface thereof.

The striking member 12 is a disk-shaped member having an outer diameter of the same size as the head portion 17c of the bolt 17, and the center of the upper surface of the striking member 12 has a protrusion for striking so that it can be easily hit with a hammer or the like. The portion 21 is fixed, and a hanging wall 12a is formed around the lower surface side. The hanging walls 12a are in abutting engagement with the outer ends 14c of the rod moving pieces 14, respectively, whereby the tapping member 12 is supported on the rod moving pieces 14.

The beating member 12 has a beating projection 21.
A plurality of countersunk bolt insertion holes 12b into which the guide bolts 15 are loosely inserted are formed at equal angular intervals around the center. As a result, the tapping member 12 causes the head 17 of the bolt 17 to move.
On the upper side of c, along the guide bolt 15, the pin extraction rod 1
It is movable in 3 axial directions.

Next, an example of use of the tool of the present invention will be described mainly with reference to FIGS. When the pin extracting rod 13 is connected to the knock pin P fitted in the component N through the pin screwing portion PT, the sliding direction of the pin extracting rod 13 and the extracting direction A and the inserting direction B of the knock pin P coincide with each other. . After this connection, the outer cylinder 18 is rotated to bring the contact member 22 into contact with the pin fitting surface Na of the component N.

Even after the abutting member 22 abuts on the component N, when the abutting member 22 is rotated, the bolt 13 moves in the pulling-out direction A of the knock pin P, in other words, the upper surface of the head 17c of the bolt 17 is the pin-pulling rod 13. It moves so as to contact the lower surface of the head 13b.

As the bolt 17 moves, the rod moving piece 14 has an inner end 14b which is the head 17c of the bolt 17.
While being pushed up by the outer end portion 14c, the outer end portion 14c is displaced upward with the inner end portion 14b as a center.

As a result, the striking member 12 is moved in the pulling out direction A of the knock pin P, and the upper surface of the head portion 17c of the bolt 17 abuts on the lower surface of the head portion 13b of the pin extracting rod 13 to prevent further movement. To be done.

Next, as shown in FIG. 5, the outer cylinder 18 is grasped with one hand, and the hammer Q is struck by the hammer Q with the other hand.
The hitting convex portion 21 of 2 is hit in the fitting direction B of the knock pin P. The impact due to this impact acts on the outer end portion 14c of the rod moving piece 14, the outer end portion 14c is displaced downward, and the inner end portion 14b is displaced in the pull-out direction A of the knock pin P. With this displacement, the pin removal rod 13
Together with the knock pin P, the knock pin P is pulled out by being shock-slipped in the pulling-out direction A thereof. That is, the striking force on the striking member 12 is converted into the pulling force for the knock pin P by the rod moving piece 14.

When the striking member 12 comes into contact with the upper surface of the head 17c of the bolt 17 by one or several striking, the pin-pulling rod 13 cannot slide any more even if striking is applied in this state.

In this case, as shown in FIG. 6, the outer cylinder 1
When 8 is rotated, the bolt 17 is pushed up, and the head 17c of the bolt 17 and the head 13b of the pin removing rod 13 are pushed.
And the inner end portion 14 of the rod moving piece 14 disposed between
A downward force is applied to b, and the outer end portion 14c moves in the pulling direction A of the knock pin P. As a result, the striking member 12 supported on the outer end portion 14c thereof moves in the pulling-out direction A of the knock pin P to return to the state shown in FIG.
The head 13b of the pin extracting rod 13 comes into contact with the upper surface of 7c. In this way, after the beating member 12 is returned to the state before being beaten, the beating convex portion 2 of the beating member 12 is again provided.
The knock pin P is extracted by hitting 1.

The present invention is not limited to the above-mentioned embodiments, but may be modified and implemented as follows.

In the above embodiment, an example in which a plurality of rod moving pieces is provided has been described, but a single rod moving piece may be used.

In the above embodiment, the head portion 19 of the male screw portion 19
b is the upper wall 13 in the female screw portion 13c of the pin extracting rod 13.
Although the description has been given by taking as an example the case of being held between e and the screwing member 20 and fixed, a male screw part having a square head is used, and the side wall of the female screw part 13c facing the head is used as the head part. May be formed into a mating square shape so as to prevent relative rotation between the pin removing rod and the male screw portion.

[0037]

According to the pin extracting tool of the first to third aspects, when a striking force is applied in the inserting direction of the pin member by a hammer or the like, the pin member moves in the extracting direction of the pin member, so that it can be easily and quickly performed. The pin member can be extracted. Also, there is no risk of getting your hands or part of your body caught,
It is safe because the tool does not bounce when the pin member comes off. Since a striking force is applied in the fitting direction of the pin member by a hammer or the like, the pin member can be pulled out with the same force as when the pin member is directly hit and fitted.

In order to transmit the striking force applied to the striking member to the pin removing rod, only the rod moving piece of semicircular cross section which is swingably supported on the head of the bolt is used, so that it is simple and robust. It is possible to provide a structure, and thus an inexpensive product can be provided.

Since a striking force in the fitting direction of the pin member is applied to a portion close to the pin removing rod, and a striking force is applied while one end of the outer cylinder is in contact with the pin fitting surface into which it is fitted, It is easy to maintain the posture of the pin removing rod, the bending force is hard to act on the pin member, and there is no fear of bending or breaking of the pin member.

Since the male screw portion at the tip of the pin removing rod is detachable from the pin removing rod, the male screw portion can be replaced according to the size of the female screw portion formed on the pin member. These can be extracted regardless of the type.

[Brief description of drawings]

FIG. 1 is an external perspective view of a pin removing tool as an embodiment of the present invention.

FIG. 2 is an exploded perspective view thereof.

3 is a cross-sectional view taken along the line I-I shown in FIG.

FIG. 4 is a cross-sectional view showing a state in which the tool of the present invention is set on a pin member fitted in a component.

FIG. 5 is a cross-sectional view showing a state where the tool is hit.

FIG. 6 is a front view showing a state where an outer cylinder is rotated and a bolt is moved.

FIG. 7 is a front view including a partial cross section of a conventional pin removing tool.

FIG. 8 is a perspective view including a partial cross section of another conventional pin removing tool.

[Explanation of symbols]

 12 tapping member 13 pin pulling rod 13b pin pulling rod head 14 rod moving piece 17 bolt 17a bolt male screw part 17c bolt head 18 outer cylinder 19 male screw part A pin member pulling direction B pin member fitting direction N part Na pin fitting surface P Knock pin (pin member) Pa Female screw part PT pin fitting part

Claims (3)

[Claims] 1. A pin removing tool for ejecting a pin member by screwing a male screw portion at the tip of the pin extracting rod into a female screw portion of the pin member and striking the head of the pin extracting rod to extract the pin removing rod. A bolt having a through hole that slidably penetrates in the axial direction, and a female screw can be screwed into the male screw portion of the bolt so that the bolt can be advanced with respect to the bolt. An outer cylinder, one end of which contacts the pin fitting surface, a striking member axially movably mounted on the head of the bolt, and a swinging motion on the head between the striking member and the head of the bolt. It is movably supported, and when the tapping member is tapped in the direction of the pin fitting surface,
A pin moving tool for moving the head of the pin extracting rod with respect to the head of the bolt in the direction of extracting the pin member. 2. A bolt head is provided with a plurality of arcuate concave portions, and rod moving pieces having a semicircular cross section are swingably fitted and supported in the respective concave portions, and one end portion of the rod moving piece serves as a striking member. The pin-pulling rod according to claim 1, wherein the pin-pulling rod engages with the other end of the pin-pulling rod. 3. The pin removing tool according to claim 1, wherein the male screw portion at the tip of the pin removing rod is detachable from the pin removing rod.