JPS5933591Y2 - hydraulic crimping tool - Google Patents

Description

[Detailed description of the invention] The invention advances the movable die by advancing the piston, and this advancement squeezes the material such as the sleeve-shaped terminal inserted between the movable die and the fixed die facing it. The present invention particularly relates to the structure of the piston portion of a so-called hydraulic crimping tool that is compressed and deformed.

By the way, in order to insert the above-mentioned material between the movable die and the fixed die, there is a sufficient distance between the two dies, and therefore, during this time, the above-mentioned die must be advanced while supporting the material by hand. Since the advancement speed becomes slow, it takes too much time for the movable die to hit the material.

To overcome this inconvenience, some tools are known in which a piston rapid-feeding mechanism is built into the tool, thereby increasing the advancing speed of the movable die, but this tool already generates the force necessary for crushing in the rapid-feeding state. Because the piston acts to compress the material, if the material is placed between the movable die and the fixed die with an uneven crushing position, the material in the uneven position is immediately crushed. I made the serious mistake of putting it away.

Therefore, in this invention, a simple structure is provided with a temporary holding function as well as a fast forwarding function, thereby preventing the above-mentioned material crushing errors from occurring.

The details of the embodiment will be described below with reference to the drawings.

A pump mechanism 2 that generates hydraulic pressure with a handle 1, a main cylinder 3 connected to the pump mechanism, a piston 4 inserted into the main cylinder, a movable die 5 that moves forward by movement of the piston 4, and a movable die 5 facing the movable die 5. A crimping tool consisting of a fixed die 6 and a fixed die 6 is used with a small-diameter secondary whose one end is opened in the direction of the center axis of the piston 4 to communicate with the main cylinder 3 so that hydraulic pressure from the main cylinder 3 can commonly flow in. A cylinder 7 is provided, and a ram 8 is inserted into this sub-cylinder 7.

In this example, this ram 8 has a die holder 9 at its protruding end.
This holder 9 is slidably fitted into a fitting hole 10 provided in the piston 4, and the lower surface 12 of the holder 9 shown in the figure can be brought into contact with the bottom surface, that is, the driven surface 11 of this fitting 10. The movable die 5 is attached to the holder 9, and a spring 13 is provided on the ram 8 so as to always urge the ram to retract.

14 is a return spring for the piston.

Therefore, as shown in Fig. 1, the electric wire is inserted between the fixed die 6 and the movable die 5 from left and right side by side, and a material a such as a sleeve-shaped terminal is inserted, and in this state, the handle is operated. When the pump mechanism 2 is operated, the oil pressure flows into the main cylinder 3, but due to the difference in FT cross-sectional area between the piston 4 and the ram 8 of the main cylinder 3, the oil pressure flows exclusively into the sub cylinder 7. Therefore, first, only the ram 8 advances to the fast-feeding position, the movable die 5 immediately comes into contact with the material a, and the material is temporarily pressed with a light L force by the small area of the ram 1.

(Figure 2) In this state, material a is not crushed.

When the ram 8 receives resistance due to the movable die 5 coming into contact with the material a, the piston 4 begins to advance due to the subsequent hydraulic pressure, but due to the advancement of the ram 8, the lower surface 12 of the holder 9 and the driven Since an amount of play l is naturally formed between the piston 4 and the surface 11, the piston 4 cannot apply the force necessary to crush the material to the movable die as long as it passes through this amount of play l.

When the material is replaced, there is a waiting time margin while the amount of play l is reached, so if the crushing position of the material shifts during this time, it can be confirmed. Moreover, the material can be reinserted between the dies.

In this case, the hydraulic pressure is released by operating a release mechanism provided on the tool.

The driven surface 11 of the piston 4 strongly presses the lower surface 12 of the holder 9 through the amount of play l.

In other words, since this pushing force is exerted by the piston 4 having a large cross-sectional area, the material a is crushed as shown in FIG.

After this crushing, when the release mechanism is operated to release the hydraulic pressure in the main cylinder 3, the piston 4 returns by the spring 14, and the ram 8
is also retracted by the spring 13.

As described above, according to the present invention, when crimping the material, the ram first advances to the fast-feeding position to lightly temporarily press the material,
After a short while, the ram is applied with a strong crimping force by the original piston, so during this time, you can check the crimping position of the material between the dies and re-insert the material between the dies to correct the crimping position. can be easily done.

In other words, like a tool with a conventional rapid-feeding mechanism, it already applies a reliable force to the piston for crushing in the rapid-feeding state (・
Therefore, crushing can always be performed at an appropriate position.

However, its practical effects are significant, such as its simple configuration.
.

[Brief explanation of drawings]

FIG. 1 is a front view of the tool, FIG. 2 is a longitudinal sectional front view of the main parts of the tool, and FIG. 3 is a sectional view of the tool in the crushing operation state. 2... Pump mechanism, 3... Main cylinder, 4... Piston, 5... Movable die, 6... Fixed die 7・・・・・・Sub-cylinder-8・・・・・・Ram.

Claims (1)

[Scope of utility model registration request] A crimping tool consisting of a pump mechanism, a main cylinder connected to the pump mechanism, a piston inserted into the main cylinder, a movable die that moves forward as the piston moves, and a fixed die opposed to the die, has the above-mentioned characteristics. A small-diameter sub-cylinder that commonly receives the hydraulic pressure of the main cylinder is provided in the direction of the central axis of the piston, a ram with a smaller cross-sectional area than the above-mentioned piston is inserted into this sub-cylinder, and the above-mentioned movable die is added to the protruding end of this ram. A hydraulic crimping tool characterized by: