JPH0729596Y2 - Manual hydraulic compression tool - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a manual hydraulic compression tool used for end treatment work of electric wires and the like, and particularly to a valve stem of a relief valve and a return valve and a contact of the valve stem. The present invention relates to a manual hydraulic compression tool in which damage such as a contact surface in contact is reduced.

[Conventional technology]

Conventionally, a manual hydraulic compression tool as shown in FIG. 5 has been known. That is, the manual hydraulic compression tool 51 is generally composed of the head 52, the body 53, the fixed handle 54, and the pressure handle 55. Inside the body 53, as shown in FIG. 5 to FIG.
A plunger chamber 57 and a plunger 58 for supplying pressure oil are provided in a substantially central portion of 53, and a cylinder portion 60 having a piston 59 built therein is provided on the upper side. The pressure handle 55 is swingably attached to the plunger 58,
Number of the pressure handle 55 Oil tank 56 due to the next swing
The oil in the piston 58 is introduced into the bottom of the piston 59 in the cylinder portion 60 by the pumping action of the plunger 58 through the intake valve 61 and the discharge valve 62, and the internal pressure of the cylinder portion 60 gradually rises. It will rise against 63.

As a result, as shown in FIG. 5, the die 64a fixed to the head of the piston 59 slides together with the piston 59, and moves in the direction of the die 64b mounted on the head 52 to perform a desired terminal treatment such as crimping. You will be able to work.

When the internal pressure of the cylinder portion 60 reaches a specified value required for crimping or the like, the valve stem 67 of the relief valve / return valve 66 moves to the left side against the biasing force of the valve stem spring 68, as shown in FIG. The oil in the cylinder portion 60 passes through the tip of the valve stem 67 and is discharged to the oil tank 56 so that the pressure is kept constant. Therefore, by pushing the return lever 69 to the right, the valve stem 67 of the relief valve / return valve 66 is lifted to the left side, and the circuit of the cylinder part 60 and the oil tank 56 is made to pass, and the piston 59 is restored by the restoring force of the piston return spring 63. By pressing, the terminal processing work such as the desired pressure bonding is completed.

[Problems to be solved by the device]

By the way, in this conventional hydraulic circuit, since the relief valve / return valve 66 is integrated, when the pressure in the cylinder portion 60 reaches a specified value (when it acts as a relief valve), the valve stem 67 is It is pushed to the left by the pressure of the oil and instantly jumps up by about 2 to 3 mm, and when the pressure is released, it instantly closes the opening φd, so the tip of the valve stem 67 and the contact surface of the body 53 in contact with the valve stem 67 are damaged. There was a problem that the valve stem spring 68 was dented. Of course, even when acting as a return valve, if the return lever 69 is stopped from being pushed, the tip of the valve stem 67 is instantly brought into contact with the opening φd by the urging force of the valve stem spring 68. It was

In addition, the conventional relief valve needs to be replaced because it has a problem that the specified value is deviated due to damage of the valve stem 67 and the valve stem spring 68, but strict setting is required for adjustment of the spring 68. Therefore, it could only be replaced by a skilled worker or a place equipped with a dedicated measuring instrument.

The present invention was devised in view of the above points, and it is a cartridge type relief valve that can be replaced by an amateur even if it is used.
-8144 Manual hydraulic system that uses the one disclosed in Japanese Patent Publication No. 8144, separates the relief valve and the return valve from each other, reduces the damage of the valve stem and the place where the valve stem contacts and the valve stem spring, and extends the life significantly. Providing a compression tool.

[Means for Solving the Problem and Its Action]

In order to solve the above problems, in the present invention, a plunger for pumping oil in an oil tank into a cylinder by swinging a pressure handle attached to a body, and a plunger for being internally fitted and pumped in the cylinder. A piston that crimps electric wires and the like with a die that is slid by pressure oil and attached to its tip and a fixed die that faces the cylinder, and a cylinder that is urged in the closing direction by a spring having a predetermined elastic force and crimped. It has a relief valve that opens when the oil pressure in the cylinder rises above a specified value to allow the oil in the cylinder to escape to the oil tank, and a return valve that returns the oil in the cylinder to the oil tank to restore the piston after the completion of crimping. A manual hydraulic compression tool, wherein the relief valve and the return valve are separated and independent, and the relief valve and the valve seat of the relief valve are attached to the outer peripheral portion of the body. The return valve can be fitted in a replaceable manner, and the return valve can be opened immediately with the spring by opening and closing with a push-type return lever that opens the ball mounted by the spring with the push pin. It is characterized in that it is held in a position, and the hydraulic passages of the relief valve and the return valve are respectively dedicated passages.

By adopting the above configuration, the life of the relief valve is significantly extended and it can be used for a long time, and the reliability of the return valve is improved. Further, since the relief valve and the valve seat of the relief valve can be attached and detached and replaced, even if the relief valve is damaged, it can be repaired by an amateur.

〔Example〕

An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is an overall front view of a manual hydraulic compression tool of the present invention, FIG. 2 is a sectional view of a piston and a plunger portion of the manual hydraulic compression tool, and FIG. 3 is a III-III line of FIG. FIG. 4 is a sectional view taken along line IV-IV in FIG.

In FIG. 1, 1 is a manual hydraulic compression tool of the present invention, 2 is a head, 3 is a body, 4 is a fixed handle, and 5 is a pressure handle.

As shown in FIGS. 2 to 4, a cylinder 6 is integrally formed with the body 3 of the body 3 of the manual hydraulic compression tool 1 at an upper portion thereof. A piston 7 integrally formed by a large diameter portion and a small diameter portion is slidably mounted inside the cylinder 6, and a piston return spring 8 contacts one end of the small diameter portion with a cylinder head (not shown). , The other end is abutted against the large-diameter end of the piston 7, and is fitted on the outside. A groove 7a is formed on the outer circumference of the large diameter portion of the piston 7,
A backup ring and an O-ring are fitted to prevent pressure oil from rising.

A two-stage plunger chamber (low-pressure plunger chamber 10 and high-pressure plunger chamber 9) for pumping pressure oil and a two-stage plunger inserted in the two-stage plunger chambers 9 and 10 are provided at substantially the center of the body 3. A rapid feed plunger 11 and a high pressure plunger 12) are provided, and a pressure handle 5 is attached to the upper ends of the two-stage plungers 11 and 12. And the pressure handle 5
The two-stage plungers 11 and 12 reciprocally slide in the two-stage plunger chambers 9 and 10 by the vertical swinging of the, and the pressure oil is supplied into the cylinder 6 by the pump action. Body 3
An oil tank 13 is provided in the fixed handle 4 below the oil tank to store oil. In addition, 14 is a strainer integrally molded with resin.

A valve stem 15, a valve stem spring 16 and a plug 17 are provided below the two-stage plunger chambers 9 and 10 in the center of the body 3.
A relief valve 20 disclosed in Japanese Utility Model Publication No. 62-8144, which includes a valve casing 19 having a hole 18 communicating with the oil tank 13 on the side, is provided in the body 3 together with a valve seat 21 of the relief valve 20. It is screwed to the outer peripheral portion so that it can be freely attached and detached and replaced from the outside, and is fitted separately from a return valve described later.

As shown in FIG. 4, a through hole 22 is bored in the upper part of the two-stage plunger chambers 9 and 10 at approximately the center of the body 3 and one end is closed with a plug 23. A return valve 26 is provided independently of the relief valve 20. The return valve 26 includes a spring 25 interposed between the return valve 26 and the ball 24 in the narrow hole portion on the other end side of the through hole 22. The spring 25 always holds the pressing pin 28 at a position where it can be immediately raised. Through hole 22
A pressing type return lever 29 is provided at the other end of the spring 27 to keep the pressing pin 28 in an immediately ascendable position by a spring 27, and the returning lever 29 is pushed in from above to push the pressing pin 28 into a narrow hole portion, The return valve 26 is opened by moving the ball 24 to one end side.

Each of the relief valve 20 and the return valve 26 has a dedicated oil passage 36, 37 between the relief valve 20 and the return valve 26, and an oil tank 13
It has dedicated oil passages 38 and 39 between and.

In addition, 30 is a suction passage for both high pressure and low pressure, 31 is a low pressure suction valve, 32 is a low pressure discharge valve, 33 is a low pressure regulation valve, 34 is a high pressure suction valve, and 35 is a high pressure discharge valve.

With this structure, the manual hydraulic compression tool of the present invention operates as follows. That is, the pressure handle 5 is used to make a two-stage plunger (fast-forward plunger 11, high-pressure plunger 12).
When is pulled to the right, the atmospheric pressure in the high-pressure plunger chamber 9 and the low-pressure plunger chamber 10 becomes low. The hydraulic oil is divided into each. Next, when the two-stage plungers 11 and 12 are pushed to the left, the hydraulic oil that has entered the high pressure plunger chamber 9 is sent to the cylinder 6 through the high pressure discharge valve 35. Similarly, the hydraulic oil that has entered the low pressure plunger chamber 10 is sent to the cylinder 6 through the low pressure discharge valve 32. By repeating this operation, the piston 7 rises and the pressure in the cylinder 6 gradually increases. If suction and discharge are further performed in this state, the pressure becomes higher. When the pressure in the cylinder 6 reaches a set value for low pressure regulation, the low pressure regulation valve 33 opens, and the hydraulic oil that has entered the low pressure plunger chamber 10 is discharged to the oil tank 13 through the low pressure regulation valve 33. Therefore, it is the working oil that has entered the high-pressure plunger chamber 9 that increases the pressure from this state. Further, this operation is repeated to increase the pressure, and the electric wire or the like is crimped by the die on the tip of the piston 7 and the die on the fixed side facing the piston. When the pressure in the cylinder 6 exceeds a specified value by crimping, the valve stem 15 of the relief valve 20 works to let the working oil in the cylinder 6 escape to the oil tank 13 to prevent the pressure from rising and keep the output constant. When lowering the piston 7, the return lever 29 is pushed, the ball 24 is pushed down by the pressing pin 28 to open the return valve 26, and the oil passages 37, 39 connecting the cylinder 6 and the oil tank 13 are connected.
Causes the working oil to flow into the oil tank 13, the pressure in the cylinder 6 drops, and the piston 7 is lowered by the piston return spring 8.

In the manual hydraulic compression tool of the present invention, the relief valve and the return valve are separated and independent, and the hydraulic passages of the relief valve and the return valve are dedicated passages, respectively, so the life of the pressure regulating valve (relief valve) is greatly extended. It can now be used for a long time. In the conventional circuit, when returning the piston, the valve stem is always operated as a return valve, and the valve stem and the contact surface of the valve stem and the valve stem spring were damaged quickly. However, in the return valve of the present invention, the ball is pressed against the narrow hole of the through hole by the spring and the internal pressure in the cylinder, so when the return valve is also used with the relief valve. More reliable.

Also, the conventional relief valve and the valve seat of the relief valve (contact surface of the valve stem) cannot be replaced, and if the specified value of the relief valve goes wrong, only a specialized factory equipped with equipment can handle it. Although there was a problem that it interferes with work, the present invention uses the relief valve and the valve seat of the relief valve disclosed in Japanese Utility Model Publication No. 62-8144, so that even an amateur can easily replace it. You can

Next, the operability of the pressure handle of the manual hydraulic compression tool of the present invention will be described.

Since the pressurizing handle 55 of the conventional manual hydraulic compression tool 51 is simply pivoted to the body 53 by the pin 151, and the handle 55 has a linear shape extending toward the grip 55a side,
Since the tool 51 is gripped by both hands, the terminals and the like can be held by a die during crimping of the wires and the like, but the wires and the like cannot be held alone. For this reason, when the crimping process is performed by one person, the location to be crimped may be displaced and inaccurate.

Therefore, in the pressure handle 5 of the manual hydraulic compression tool 1 of the present invention, the handle opening spring 102 is wound around the pin 101,
Since the ends of the pressure handle 5 and the body 3 are brought into contact with each other, the pressure handle 5 can be automatically opened, and the body 3 side of the pressure handle 5 can be opened.
Since it has a straight part that is parallel to the
As shown in the figure, it can be held with one hand, and when combined with the handle opening spring 102, one-handed operation becomes possible.
Therefore, at the time of crimping the electric wire or the like, the electric wire or the like can be held by the other hand, and the crimping can be accurately performed by one person, and the workability is improved.

Next, the structure for preventing rotation of the head of the manual hydraulic compression tool of the present invention will be described.

Conventionally, the head 52 of the manual hydraulic compression tool 51 has a structure for rotating the head 52 in order to improve workability, but conventionally, as shown in FIGS. The threading is performed on the head, and the head portion 152 of the bolt fastened to the screw and the column 153 of the body 53 are used.
However, in order to make a space for processing this screw, a protrusion 154 is attached to the forging blank, which causes a problem that the forging die becomes complicated and expensive.

Therefore, in the case of the manual hydraulic compression tool 1 of the present invention,
As shown in FIG. 10 and FIG. 10, the head 2 is provided with a stepped stopper portion 103, and the head of the return lever 29 is used to prevent rotation. Therefore, screw processing is not required,
The forging dies became simple and inexpensive. Further, the number of parts is smaller than that of the conventional product, the processing is easy, the appearance is neat, and the handling is easy.

[Effect of device]

As explained above, the manual hydraulic compression tool of the present invention is
Since the relief valve and the return valve are separated and independent, and the hydraulic passages for the relief valve and the return valve are each dedicated passages, the life of the relief valve is greatly extended and it is possible to withstand long-term use and With the push-type return lever, the internal ball can be pushed open, and the return valve can be opened and closed reliably, improving reliability for long-term use. Also, since the relief valve and the valve seat of the relief valve can be detached and replaced, damage to the valve stay of the relief valve, the valve stay spring, etc. may cause an error in accuracy and may hinder work. In this case, even a general worker can easily replace and repair the relief valve, improving convenience.

[Brief description of drawings]

FIG. 1 is an overall front view of a manual hydraulic compression tool of the present invention, FIG. 2 is a sectional view of a piston and a plunger portion of the manual hydraulic compression tool, and FIG. 3 is a III-III line of FIG. Sectional view, FIG. 4 is a sectional view taken along the line IV-IV of FIG. 1, FIG. 5 is an overall front view of a conventional manual hydraulic compression tool, and FIG. 6 is a piston and a plunger portion of the conventional manual hydraulic compression tool. FIG. 7 is a sectional view of a main part of FIG. 7, FIG. 7 is a sectional view taken along the line VII-VII of FIG. 5, FIG. 8 is an explanatory view showing how to grasp a manual hydraulic compression tool when operating with one hand, and FIG. 10 is an explanatory view showing a head detent of a manual hydraulic compression tool, FIG. 10 is a sectional view taken along the line XX of FIG. 9, and FIG. 11 is an explanatory view showing a head detent of a conventional manual hydraulic compression tool. The figure is a sectional view taken along the line XII-XII in FIG. 1 ... Manual hydraulic compression tool 2 ... Head, 3 ... Body 5 ... Pressure handle, 6 ... Cylinder 7 ... Piston, 8 ... Piston return spring 11 ... Fast forward plunger, 12 ... High pressure plunger 13 …… Oil tank, 14 …… Strainer 15 …… Valve stem, 16 …… Valve stem Spring 20 …… Relief valve, 21 …… Valve seat 25 …… Spring, 26 …… Return valve 28 …… Pressing pin, 29 ...... Return lever 36,37,38,39 …… Oil passage

Claims (1)

[Scope of utility model registration request] 1. A plunger for pressure-feeding oil in an oil tank into a cylinder by swinging a pressure handle attached to a body, and a plunger which is fitted in the cylinder and slides by pressure-oil pressure-fed. A piston attached to the tip and a die on the opposite fixed side to crimp electric wires, etc., and a spring having a prescribed elastic force urges it in the closing direction to press it so that the hydraulic pressure in the cylinder exceeds a specified value. A manual hydraulic compression tool having a relief valve that opens when the pressure reaches the oil tank to allow the oil in the cylinder to escape to the oil tank, and a return valve that returns the oil in the cylinder to the oil tank to restore the piston after completion of crimping. The relief valve and the return valve are separated from each other, and the relief valve and the valve seat of the relief valve are detachably and replaceably mounted on the outer peripheral portion of the body. , The return valve is opened and closed by a pressing type return lever that opens a ball mounted by a spring with a push-out pin, and the push-up pin is always held by the spring at a position where the push-up pin can be immediately raised. A manual hydraulic compression tool characterized in that the hydraulic passages of the return valves are respectively dedicated passages.