JPH0451982Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to gripping chopsticks for bar materials, and particularly to gripping chopsticks suitable for holding bar materials in die forging.

[Conventional technology] When die forging a bar, conventionally a relatively long part of the bar is left as a gripping allowance, and when the bar sticks to the die during forging, it is made to protrude outside the die. The ends of the gripping allowance are held with gripping chopsticks so that the bar can be released from the mold with a relatively small force.

[Problems to be Solved by the Invention] By the way, the above-mentioned gripping allowance is cut off before it is made into a final product, and this causes a problem of lowering the material yield.

Therefore, the purpose of the present invention is to provide bar gripping chopsticks that can strongly and reliably directly hold the end of a bar product, thereby eliminating the need for the above-mentioned gripping allowance and dramatically improving material yield. do.

[Means for Solving the Problems] The configuration of the present invention will be explained with reference to FIG. 1. When the configuration of the present invention is explained with reference to FIG. A pair of grip bars 1A, 1B are provided so that the tips 12 are close to each other, and the grip bars 1A,
A semicircular gripping portion 12 is formed at each tip of the bar 1B along the outer periphery of the end of the bar, and the gripping portion 12 is disposed substantially parallel to each other without intersecting each other, and connected at a position close to one end 21 of the gripping rod. A pair of operating levers 2A, 2B are provided that extend in the rearward extension direction of the operating levers 1A, 1B, and are set such that the one end 21 separates when the other end 22 approaches each other.
One end 21 of the lever B is rotatably connected to the rear ends 13 of the grip bars 1A and 1B, respectively, and the other ends 22 of the operating levers 2A and 2B are opened and closed.

[Operations and Effects] When the other ends 22 of the operating levers 2A, 2B are opened and closed, a large acting force is generated on the rear ends 13 of the gripping bars 1A, 1B, and this acting force is approximately the same size and acts on the gripping portion 12. also occurs. Figure 1 shows operation lever 2.
A and 2B are shown in a closed state, and the levers 2A and 2B are shown closed.
The direction of movement of each part when 2B is opened is indicated by arrows in the figure.

Since the gripping portion 12 is shaped along the outer periphery of the end of the bar, together with the large acting force generated therein, the gripping portion 12 reliably holds the bar and there is no fear of damaging the bar being held.

According to the above configuration, when the other ends 22 of the operation levers 2A, 2B are grasped and brought close to each other, the one end 21
are spaced apart from each other and connected to the grip rod 1
Since the rear ends 13 of A and 1B are separated, the grip bar 1
The tips of A and 1B approach each other. That is, when gripping a bar material, it is sufficient to lightly grip the gripping chopsticks, and it is possible to grip the gripping chopsticks with one hand and operate the forging device with the other hand.

As described above, according to the gripping chopsticks of the present invention, the end of the bar product can be strongly and reliably held directly with a relatively small force, so there is no need for the conventional gripping margin, and the material yield is dramatically improved. do.

[Example] Fig. 1 shows a partial cross-sectional overall side view of a pair of chopsticks.

The above-mentioned grip chopsticks are composed of a pair of upper and lower grip bars 1A, 1B arranged substantially parallel to each other, and a pair of upper and lower operation levers 2A, 2B also arranged substantially parallel to each other. The grip bars 1A and 1B have the same shape and are arranged in vertically symmetrical positions, and the rear portions of the opposing surfaces are inclined in the direction of separation from each other approximately at the center. Each lever 1A, 1B has a semicircular groove 11 in the center of the opposing surface (Fig. 2).
are formed, and a shaft member 3 is disposed in the opposing grooves 11 with their outer peripheries in contact. Oval side plates 41, 42 are provided along both sides of the central part of the levers 1A, 1B, and these levers 1A, 1B are connected to punch holes provided at the upper and lower ends of the respective side plates 41, 42. They are connected by pin members 51 and 52 that pass through holes provided in each lever 1A and 1B.

The tips of each of the gripping rods 1A and 1B are large-diameter gripping portions 12, and in this embodiment, these gripping portions 12 have a semi-cylindrical shape with one end open (FIG. 3) in order to grip a round bar. . The above lever 1A,
The rear end 13 of 1B is a U-shaped clevis (FIGS. 2 and 4).

The operating levers 2A and 2B have the same shape, are arranged in vertically symmetrical positions, and have opposing portions of one end 21 connected to each other by a shaft member 6 so as to be freely rotatable. That is, each lever 2
A and 2B have opposing portions of one end 21 bulged out, and the bulged portion 211 (FIGS. 5 and 6) has a wall thickness that is half that of the main body. And the levers 2A, 2B
The above-mentioned respective bulging parts 211 are overlapped, and the above-mentioned shaft member 6 is inserted through a punch hole 212 provided here.

There are punch holes 212 in each of the above operating levers 2A and 2B.
A punch hole 213 is provided near each lever 2.
A, 2B grab the above-mentioned punch hole 213 and hold the rods 1A, 1.
The grip bars 1A and 1B are connected to the rear ends 13 of the grip bars 1A and 1B by pin members 53 and 54, respectively.

In the gripping chopsticks with the above structure, each operating lever 2
When the other ends 22 (Fig. 1) of A and 2B are opened outward away from each other as shown by the arrows, the levers 2A and 2B are opened.
The connecting portions of the grip bars 1A, 1B rotate inward around the shaft member 6 (arrows in the figure), and as a result, the grip portions 12 of the grip bars 1A, 1B rotate around the shaft member 3.
opens outward (arrows shown). After covering the open gripping part 12 on the end of the bar, the other end of the operating levers 2A, 2B is moved in the opposite direction.
2 to approach each other, the grip part 1
2 is closed as shown to firmly hold the end of the bar.

The gripping force of the gripping portion 12 at this time is approximately equal to the force acting on the rear ends 13 of the gripping bars 1A, 1B, and this acting force is
4 and the distance l ₁ between the shaft member 6 and the operating lever 2A,
It is determined by the ratio of the distance l ₂ between the other ends 22 of 2B. And in this invention, since l ₁ <<l ₂ ,
A large gripping force can be obtained by only applying a relatively small force to the other end 22.

In the present invention, since the gripping portion 12 is shaped to follow the outer periphery of the bar, the bar can be held securely, and there is no risk of damaging the bar when gripping.

[Brief explanation of the drawing]

Figure 1 is a partially cross-sectional overall side view of the gripping chopsticks;
The figure is a plan view of the lower grip lever seen from above, Figure 3 is a view in the direction of arrow A in Figure 2, Figure 4 is a view in the direction of arrow B in Figure 2, and Figures 5 and 6 are the operating lever. FIG. 2 is a side view and a plan view seen from below, respectively. 1A, 1B...Gripping bar, 12...Gripping part, 1
3... Rear end, 2A, 2B... Operation lever, 21...
...One end, 22...Other end, 3, 6...Shaft member.

Claims (1)

[Scope of utility model registration request] Grip chopsticks that grip and hold the ends of bars are arranged approximately parallel to each other without crossing each other, and are connected at approximately the center of each other so that when the rear ends are separated, the tips approach each other. A pair of gripping rods are provided, and a semicircular gripping portion is formed at each tip of the gripping rod along the outer periphery of the end of the rod material, while the gripping portions are arranged substantially parallel to each other without intersecting each other, and one end A pair of operating levers are provided that are connected at a position close to the grip bar and extend in the rearward extension direction of the grip bar, and are set such that one end of the lever is separated when the other end is brought close to the grip bar, and one end of each of the operating levers is connected to the grip bar. Gripping chopsticks made of a bar material, each of which is rotatably connected to each rear end of the bar, and each other end of the operating lever is operated to open or close.