JP2530221Y2 - Manual hydraulic tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a manual hydraulic tool, and more particularly to a manual hydraulic tool used for terminal treatment of electric wires and the like.

[Conventional technology]

Conventionally, manual hydraulic tools include compression tools for attaching terminals to electric wires, cutting tools for cutting electric wires, or punchers,
There is a manual or foot-operated hydraulic pump that pumps oil to a head-separated tool such as a vendor or cutter.

This type of manual hydraulic tool includes a head (separate body in the case of a hydraulic pump) for performing a processing operation, a body having a built-in hydraulic circuit, and a pressurizing handle and a fixed handle for operating. The hydraulic circuit includes a ram that sucks and pumps oil in an attached oil tank and a piston that is slidable by hydraulic pressure, and the piston slides by a pump action of the ram by operating a pressure handle. As a result, a die or the like fixed to the head of the piston moves toward the fixed head and performs a desired processing operation.

The oil in the oil tank is circulated, and each time the oil is used, the metal powder due to wear of the sliding portion, the pressure receiving portion, and the like, and particularly, when the sleeve or the like is compressed and connected, the electric wire sealed in the sleeve itself is used. The paste-like fine metal particles for improving the connection performance of the tool flow out by compression, adhere to the outer periphery of the piston of the tool, and mix into the oil.

This metal powder or paste-like metal fine particles damages sliding parts such as pistons and rams and sealing members such as O-rings.
Further, the seals of many valves in the internal pump section and the hydraulic circuit section may be damaged, and eventually, a serious failure such as oil leakage or malfunction may occur.

Therefore, in order to prevent such serious failures, the oil is regularly inspected and replaced.However, due to the maintenance and inspection system on the user's side, the operator has to forget to inspect and replace.
In reality, it is not possible to thoroughly implement inspection and replacement.

[Problems to be solved by the invention]

However, the inspection and replacement of oil in the manual hydraulic tool has the following problems.

The time to change the oil in the tool is not constant depending on the frequency of use and the work content. Therefore, it is necessary to disassemble a part of the tool and extract and inspect the oil in order to know the optimum replacement time. Since this requires a lot of trouble, there are quite a few cases where the oil is used without changing the oil until the tool becomes inconvenient.

Therefore, as the best and general means under the present circumstances, it is a means to perform a uniform oil change by periodic inspection once a year. The degree of the change varies greatly, and oil replacement may be necessary even shortly after the inspection.On the other hand, oil replacement is not necessary even at the time of inspection. Is not optimal.

Therefore, if the amount is small, the oil must be replaced before the oil is contaminated, which is not economical. In addition, if the oil is used frequently, the oil becomes too dirty, which may cause performance deterioration or failure, and cause inconvenience.

And even if the oil in the oil tank is changed in consideration of the frequency of use, dirty oil may accumulate in other parts. Becomes

Furthermore, even if a trouble occurs inside and bubbles are generated in the oil, the oil cannot be visually confirmed, so that a failure or the like cannot be quickly detected.

The present invention has been made in view of the above problems.By visually determining the dirt of the oil from the outside, it is possible to know the time to replace the oil, it is economical, and it is possible to prevent the performance degradation and breakdown, etc. An object of the present invention is to provide a hand-operated hydraulic tool that can be detected quickly.

[Means for solving the problem]

In order to solve the above-mentioned problem, the present invention has a hydraulic circuit internally provided in a tool body provided with an oil tank, and a manual hydraulic tool having a ram for sucking oil in the oil tank and feeding the oil in the hydraulic circuit. A display plate for displaying oil and a transparent plate that makes the display plate visible from the outside, forming a space through which the oil from the hydraulic circuit passes between the transparent plate and the display plate, A hand-operated hydraulic tool is characterized in that one of the display plate and the transparent plate is provided with a display for visually judging oil turbidity.

[Action]

According to the present invention, dirt of oil passing through the hydraulic circuit can be visually judged from the outside by the indicator of the oil turbidity gauge, so that it is possible to know the dirt of oil and the time of replacement. Further, since the oil can be visually observed, it is possible to confirm bubbles generated due to an internal trouble.

〔Example〕

 An embodiment according to the present invention will be described with reference to the drawings.

1 is a front sectional view of a hand-operated hydraulic tool, FIG. 2 is a bottom sectional view of FIG. 1, FIG. 3 is a sectional view of a main part showing an oil turbidity gauge, and FIG. FIG. 5 is a perspective view of the oil turbidity gauge, and FIG. 6 is a sectional view of a main part showing another oil turbidity gauge.

As shown in FIGS. 1 and 2, a manual hydraulic tool A is a compression tool for attaching a terminal to an electric wire, a head 1 for performing a processing operation, a body 2 having a built-in hydraulic circuit, and a pressure handle 3 for operating. And a fixed handle 4. A head 1 is disposed at the distal end, a body 2 is disposed at the center, and a pressure handle 3 and a fixed handle 4 are disposed at the proximal end.

The head 1 is composed of a fixed head 1a integrally fixed to the body 2 and a piston 1b. The piston 1b moves toward the fixed head 1a, so that a die (not shown) is attached to the head of the fixed head 1a. ) And a die (not shown) attached to the head of the piston 1b are narrowed, so that the terminal located at the end of the electric wire is compressed and attached.

As shown in FIGS. 1 to 3, the hydraulic circuit is provided with an oil tank 5 and a ram 6 for sucking oil in the oil tank 5 and feeding the oil, and the piston 1b slidable by hydraulic pressure. An oil tank 5 is provided at a base end of the body 2, a ram 6 is provided at a substantially central portion, and a piston 1b is provided at a distal end. The piston 1b is fitted in a cylinder 7b formed integrally with the body 2, and has a return sling provided inside.
It is always urged to the proximal end by 7c. The return spring 7c is wound around a support member 7d fixed to the body 2, and is provided between the bottom plate of the piston 1b and the upper plate of the support member 7d in a contracted manner. The oil tank 5 is provided in a cylindrical fixed handle 4 attached to the body 2. The hydraulic circuit is provided with an oil turbidity gauge C for visually judging oil contamination from outside.

The ram 6 is of a two-stage type. The first upper stage is a low-pressure ram 6a, and the second lower stage is a high-pressure ram 6b. The pressure handle 3 is attached to the ram 6 so as to be swingable.
The oil in the oil tank 5 is sucked by the ram cylinders 6c and 6d and discharged to the cylinder 7b. Thus, the piston 1b moves toward the distal end side against the return spring 7c.

That is, when the piston 1b moves to the distal end side (to the left in FIG. 1), the flow of oil through the low-pressure ram 6a is controlled by the oil filter 5a, the first oil passage 8a, the suction valve 8b, the first chamber 8
c, the ram cylinder 6c, the second oil passage 8d, the check valve 8e, and the flow in the cylinder 7b in this order. Similarly, the oil flow passing through the high-pressure ram 6b also passes through the oil filter 5a and the first oil passage 8a, but is branched thereafter, and the suction valve 9a, the second chamber 9b, the ram cylinder 6d, the check valve 9c, the cylinder Flows in order within 7b. As a result, piston 1
The dice (not shown) fixed to the head of b slides with the piston 1b and moves in the direction of the dice (not shown) fixed to the fixed head 1a so that a desired terminal processing operation can be performed. I have.

And the piston 1b is at the base end (right side in FIG. 1).
When the return valve 10 is pushed by the pressurizing handle 3, the ball 10a is pushed and the third oil passage 10 in the cylinder 7b is moved.
b, returning to the oil tank 5 through the third chamber 10c, the fourth chamber 10d, and the fourth oil passage 10e, the piston 7a is moved by being pushed by the return spring 7c. In addition, 11 is a relief valve.

As shown in FIGS. 3 to 5, the oil turbidity gauge C is press-fitted into a hole 13 formed in the outer wall of the body 2, and the hole 13 is provided with a bypass passage 12 formed in the body 2.
a and 12b communicate with the first oil passage 8a of the hydraulic circuit. The oil turbidity gauge C has a substantially cylindrical outer cylinder 21 and an outer cylinder 21.
A substantially circular display plate 22 provided therein, a substantially cylindrical inner cylindrical body 22a fitted into the outer cylindrical body 21, and a substantially disk-shaped transparent plate attached to a tip side edge of the outer cylindrical body 21. 23, the outer cylinder 21 is formed of a press-fittable soft resin or hard rubber, and the display plate 22 and the inner cylinder 22a are formed of metal, plastics, or the like.
The transparent plate 23 is formed of a transparent resin, glass, or the like.

Since the display plate 22 has an outer diameter smaller than the inner diameter of the inner cylindrical body 22a, a plurality of support members radially arranged are provided.
An opening 22d through which oil can flow is provided between the inner peripheral edge of the inner cylindrical body 22a and the outer peripheral portion of the display panel 22. To have.

In addition, a slightly concave display portion is provided at the center of the display plate 22.
24 are provided. The display unit 24 is provided with a display body 25 such as an identification color, a character or the like printed thereon, or a plate colored in such a manner that the degree of oil turbidity, that is, the degree of dirt can be visually determined.

A space 22e is provided between the display plate 22 and the transparent plate 23, and the space 22e has a first hydraulic circuit
The oil passing through the oil passage 8a enters through the bypass passage 12a, the hole 13 and the opening 22d, and the oil entering the section 22e passes through the opening 22d, the hole 13 and the bypass passage 12b into the first oil passage. 8
It flows to a.

The oil turbidity gauge is provided in a space 22e between the display plate 22 and the transparent plate 23.
When the oil flowing through the display panel becomes dirty and turbid, the color, characters, and the like applied to the display unit 24 of the display panel 22 using the transmittance become invisible. Further, a display body 25 such as a color and a character applied to the display plate 22 may be provided on the inner surface or the outer surface of the transparent plate 23. In this case, the color of the display 25 is set to the same color as the oil at the time of replacement, and it is determined whether or not the oil flowing in the space 22e between the display plate 22 and the transparent plate 23 becomes dirty and has the same color as the oil of the display 25. And change the oil.

As described above, the oil flowing in the hydraulic circuit can be visually judged from the outside by the oil turbidity gauge C, so that it is possible to judge the timing of replacing the oil, and to prevent performance degradation or failure due to oil contamination.

As another example, the oil turbidity gauge D shown in FIG.
A transparent plate 32 is attached to an outer cylindrical body 31, and a display plate is provided on the bottom surface of the hole 13 with the display plate serving as the bottom surface of the hole 13.

The present invention is not limited to the above embodiment. For example, an oil turbidity gauge may be provided in a hydraulic circuit of a cutting tool for cutting an electric wire, and a hydraulic circuit of a hydraulic pump for pumping oil to a device for cutting an electric wire or the like. May be provided with an oil turbidity gauge.

Further, in this embodiment, the oil turbidity gauge is attached by press fitting, but the present invention is not limited to this, and the oil turbidity gauge may be detachably attached by screwing or the like. In this case, it is easy to clean the display unit and the like in the oil turbidity gauge.

[Effect of the invention]

The present invention is configured as described above, and has the following effects.

By providing the oil circuit with an oil turbidity gauge for visually determining oil contamination from the outside in the hydraulic circuit, it is possible to know the time of oil replacement, and it is possible to prevent performance degradation or failure due to excessive oil contamination. In addition, the oil is not replaced before the oil becomes dirty, which is economical.

And even if the oil in the oil tank is changed, dirty oil may accumulate in other parts, and even in such a case, the oil can be seen as dirty, so it can be prevented from being used as it is, resulting in reduced performance or failure. Can be prevented.

Further, since the oil can be visually checked, if a trouble occurs inside and oil bubbles are generated, a failure or the like can be quickly detected.

Therefore, oil contamination on hydraulic tools often causes fatal damage to tool performance.However, since it is possible to easily and accurately know when to change oil, it is important to maintain tool performance and improve durability. It is useful.

[Brief description of the drawings]

1 is a front sectional view of a hand-operated hydraulic tool, FIG. 2 is a bottom sectional view of FIG. 1, FIG. 3 is a sectional view of a main part showing an oil turbidity gauge, FIG. 4 is a cross-sectional view of the oil turbidity gauge, FIG. 5 is a perspective view of the oil turbidity gauge, and FIG. 6 is a cross-sectional view of a main part showing another oil turbidity gauge. A: Manual hydraulic tool C, D: Oil turbidity gauge 1 ... Head, 2 ... Body 3 ... Pressurizing handle, 4 ... Fixed handle 5 ... Oil tank, 6 ... Ram 8a ... No. 1 oil passage 12a, 12b bypass passage 21, 31 outer cylinder 22, display panel 22a inner cylinder 22c support member 23, 32 transparent plate 24 display unit 25, 33 …… Display body

Claims (1)

(57) [Scope of request for utility model registration] 1. A manually operated hydraulic tool having a hydraulic circuit internally provided in a tool body provided with an oil tank, and a ram for sucking oil in the oil tank and feeding the oil in the hydraulic circuit. A suction oil passage of the hydraulic circuit through which the oil from the oil tank to be sucked passes is provided with a bypass oil passage interposing an oil turbidity gauge, and the oil turbidity gauge is provided with a display plate for displaying oil and an external display plate. A transparent plate that allows the oil from the hydraulic circuit to pass therethrough between the transparent plate and the display plate, and the oil turbidity in one of the display plate and the transparent plate. A hand-operated hydraulic tool characterized by providing a display body for visually judging.