JPH06126492A - Portable hydraulic tool - Google Patents

Abstract

PURPOSE:To easily make a return valve operable with one hand by operating an activating lever projected from the outside of a case through a connecting member when a movable member arranged near a handle is moved by the hand holding the handle. CONSTITUTION:The end of the activating lever 31 brought into contact successively with the valve body 30 of a hand-operated return valve 29 which is connected to a hydraulic circuit built in a portable case 1 is protruded from the outside of the case 1. The portable hydraulic tool is such that, in the proximity of the handle (32) of this case 1, the movable member 36 is provided and that, between the movable member 36 and the end of the activating lever 31, a connecting member 37 interlocking the member 36 and the lever 31 is interposed. Thus, with the handle held by hand, the activating part of the return valve 29 is easily operated by one hand; and the portable tool that is excellent in operability and handleability is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hand-held hydraulic tool for pressurizing hydraulic oil stored in an oil tank by a plunger pump to transfer it to a cylinder and moving a piston rod provided with the tool to perform work.

[0002]

2. Description of the Related Art Conventionally, there has been known a hand-held hydraulic tool in which hydraulic oil stored in an oil tank is pressurized by a hydraulic pump and transferred to a cylinder, and a piston rod provided with a tool is moved to perform work. In particular, a battery-type electric motor is used to improve the functionality, and the whole is of a pistol type, for example, Japanese Utility Model Laid-Open No. 1-127637 and Japanese Utility Model Laid-Open No. 2-2.
No. 128855, Japanese Utility Model Publication No. 3-126295, and the like.

These hand-held hydraulic tools hold a grip portion and operate a trigger type switch arranged at a front position of the grip portion to operate a hydraulic pump by an electric motor built in a case and store the oil in an oil tank. Pressurize the oil and transfer it to the cylinder via the hydraulic circuit, move the piston rod with the tool to perform the work, and operate the operation part of the return valve that protrudes to the outer surface of the case to operate the pressurized oil in the cylinder. It is returned to the oil tank to prepare for the next work.

However, in the conventional hand-held hydraulic tool, an off-the-shelf general-purpose product is used as the electric mechanism portion arranged in the rear portion including the grip portion in many cases because of the arrangement of parts and the arrangement of hydraulic circuits. Since it is used, the working part of the return valve is not installed near the grip.

Therefore, it is difficult to operate the action portion of the return valve with one hand while holding the grip portion, and there is a problem that the operability is extremely poor.

[0006]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is to grasp a conventional grip and operate a trigger type switch arranged in front of the grip to operate a hydraulic pump by an electric motor built in a case. In the case of a hand-held hydraulic tool that is operated to pressurize the hydraulic oil stored in an oil tank and transfer it to a cylinder via a hydraulic circuit to move a piston rod with a tool to perform work, the grip was gripped. Since the return valve cannot be operated by hand, the operability is extremely poor.

[0007]

SUMMARY OF THE INVENTION According to the present invention, an end of an operating rod connected to a valve element of a manual return valve connected to a hydraulic circuit built in a hand-held case is provided with an end portion of an outer surface of the case. And a pushing member provided near the grip portion of the case, and a connecting member intervening between the pushing member and the end of the working rod is interposed. And to provide a hand-held hydraulic tool capable of operating the return valve with the hand holding the grip portion.

[0008]

[Operation] When the pushing member arranged near the grip is moved by the hand gripping the grip, the operating rod projected from the outer surface of the case via the connecting member operates to open the return valve and release the pressure oil. It will be returned to the oil tank.

[0009]

Embodiments of the present invention will now be described with reference to the drawings.

FIGS. 1 to 5 show an embodiment in which the present invention is applied to a crimping tool, in which a cylinder 2 is arranged at the tip of a hand-held case 1 which is entirely formed in a pistol shape. The male die 4 is attached to the piston rod 3a integral with the piston 3 fitted in the cylinder 2, and the female die 5 is arranged at the projecting end from the cylinder 2 so as to face the male die 4. ing.

The cylinder 2 is formed in a cylinder block 6 which constitutes a part of the case 1.
An electric motor 7 is arranged in the rear of the cylinder with a rotating shaft 8 aligned with the axis of the piston rod 3 and an eccentric cam is formed in a space 9 formed between the cylinder 2 of the cylinder block 6 and the electric motor 7. 10 is the camshaft 11 of the electric motor 7
It is fixedly attached to the rotating shaft 8 of.

The cylinder block 6 has a cylinder 2
A hydraulic circuit is provided for driving the piston 3 fitted in the.

This hydraulic circuit is mainly composed of hydraulic oil 13 housed in an oil tank 12 vertically provided below the cylinder block 6.
Hydraulic supply circuit A for pressurizing and supplying to the cylinder 2
And the hydraulic oil 13 supplied to the cylinder 2 to the oil tank 12
And a pressure adjusting circuit C for adjusting the pressure of the pressure oil supplied to the cylinder 2.

The oil tank 12 is formed into a cylindrical shape that can be contracted and expanded by an elastic material such as synthetic rubber, and its opening end 14 is formed in a cylindrical portion 15 formed below the cylinder block 6. It is fitted in a sealed state.

The hydraulic pressure supply circuit A connects between the oil tank 12 and the cylinder 2, and the plunger pump 16
Are connected. The plunger pump 16 is formed by inserting a plunger 18 into a cylinder 17 extending in a direction perpendicular to the axis of the cylinder 2 through a space 9 formed in the cylinder block 6 and an oil tank 12, and a lower end of the cylinder 17 is formed. The suction tank 19 formed in the
A suction valve 20 that projects inside is connected.

Cylinder 1 in plunger pump 16
A receiving seat 21 having a through hole is arranged in the lower part of 7, and a coil-like elastic spring 23 for pressing the ball valve of the suction valve 20 is interposed on the lower surface of the receiving seat 21. A coil-shaped elastic spring 22 is interposed between the upper surface of the seat 21 and the lower surface of the plunger 18 to press the upper surface of the plunger 18 against the side surface of the eccentric cam 10.

Further, at the upper end of the space 9 in which the eccentric cam 10 is fitted, there is provided an oil supply port 24 with a plug for filling the oil tank 12 with hydraulic oil 13 via the space 9 and the plunger pump 16. ing.

Further, a discharge port 25 extending in the horizontal direction is formed in the lower portion of the cylinder 17 forming the plunger pump 16, and the discharge port 25 is formed parallel to the operating direction of the hydraulic pump 16 communicating with the cylinder 2. Pressure oil passage 2
A discharge valve 27 is arranged at a position intersecting with 6. The discharge valve 27 is inserted and arranged from the outside of the cylinder block 6.

The return circuit B has a pressure oil passage 28 connecting the pressure oil passage 26 and the oil tank 12, and a manual return valve 29 is arranged at a predetermined position of the pressure oil passage 28.

The valve body 30 of the return valve 29 has a working rod 31.
Are connected in series, and the ends thereof are projected from the mounting holes 33 that are perpendicular to the cylinder 2 and the grip portion 32 of the case 1 (cylinder block 6), respectively, and
Is urged outward by a coil-shaped elastic spring 34 arranged at.

Further, a thick plate-shaped pushing member 36 is mounted near the upper portion of a trigger type electric switch 35 for controlling the connection and disconnection of the electric motor 7 arranged in front of the grip portion 32 of the case 1. It is arranged parallel to the hole 33.

The pushing member 36 has both end portions 36a and 36b.
Is protruded from the side surfaces 1a and 1b of the case 1 and is slidably mounted along the longitudinal axis thereof to prevent the case 1 from being pulled out to the side surface 1a side and to be constantly protruded from the opposite side surface 1b. The end portion 36b is bulged for storing.

Further, the pushing member 3 is provided on the side surface 1b of the case 1.
A connecting member 37 for interlocking 6 and the operating rod 31 is interposed.

The connecting member 37 extends over the end portion of the operating rod 31 and the end portion 36b of the pushing member 36, and a shaft 38 is provided near the operating rod 31 on the side surface 1b of the case 1 near the operating rod 31.
It is a lever-shaped member that is pivotally attached by means of the lever action using the lever lever side with the acting rod 31 side as the emphasis point, the pushing member 36 side as the force point, and the shaft 38 as the fulcrum.
The pushing member 36 is pushed toward the side surface 1b of the case 1 by the urging force of the return valve 29 at the closed position.

On the other hand, the pressure adjusting circuit C has a pressure oil passage 40 connecting the pressure oil passage 26 and a relief valve 39 arranged in the oil tank 12.

In the drawings, reference numeral 41 is a battery housed in the case 1, 42 is a bearing fitting, 43 is a bearing, 4
4 is an oil seal.

In this embodiment, first, the grip portion 32 of the case 1 is grasped and a work piece 45 such as a crimp terminal having a connecting end portion of an electric wire inserted between the male die 4 and the female die 5 is arranged and returned. When the trigger type electric switch 35 is pulled and turned ON with the return valve 29 of the circuit B closed, the eccentric cam 10 is rotated by the electric motor 7 and the plunger pump 16 arranged in the hydraulic pressure supply circuit A is activated. , The hydraulic oil 13 stored in the oil tank 12 is pressurized and pressure-fed to the cylinder 2 from the pressure oil passage 26, the piston 3 fitted in the cylinder 2 advances, and the male die 4 at the tip thereof moves to the female die 5. The workpieces 45 approach each other and the workpiece 45 arranged between them is pressure-bonded.

When the pressure of the pressure oil in the hydraulic circuit exceeds a set value, that is, when a predetermined crimping operation is performed, the relief valve 39 of the pressure adjusting circuit C opens and the pressure oil in the cylinder 2 and the hydraulic circuit is transferred to the oil tank. Release to 12 and maintain set pressure.

Next, when the electric switch 35 is turned off, the return valve 29 is opened to return the pressure oil in the hydraulic circuit to the oil tank 12, and the operation is completed.

At this time, when the forefinger whose electric switch 35 is turned off is released while the grip 32 of the case 1 is being held and the end 36a of the pushing member 36 is pushed by the finger, the connecting member 37 is moved to the position shown in FIG. And the action rod 31 pushes inward against the urging force of the elastic spring 34, the valve body 30 deviates from the pressure oil passage 28, and the return valve 29 opens to open the hydraulic pressure. The pressure oil in the circuit is returned to the oil tank 12.

When the pressing of the pushing member 36 is released, the pushing member 36 is pushed by the urging force of the elastic spring 34 to the end portion 3.
It is pushed back to the 6a side and returned to its original position, and the return valve 29 is closed to prepare for the next work.

As described above, according to this embodiment, since the return valve 29 can be opened and closed by operating the pushing member 36 with the hand holding the grip 32 of the case 1, the operability is very good and the efficiency is high. You can do a good job.

In this embodiment, an eccentric cam 10 and a plunger pump 16 are attached to a cylinder block 6 forming a cylinder 2.
Is installed inside, and an electric motor 7 is arranged behind it so that its rotation shaft 8 is aligned with the axis of the cylinder 2, and the cylinder block 6 drives the piston 3 fitted in the cylinder 2. A hydraulic circuit for this purpose is integrally formed, and an oil tank 12 is vertically provided below the cylinder block 6, and a relief valve 39 is arranged inside the oil tank 12, whereby the hydraulic passage is formed as a whole as a short length. Therefore, the entire crimping tool can be made extremely compact, and in particular, the discharge valve 27 and the return valve 29 are arranged so as to be inserted from the outside of the cylinder block 6 in a direction perpendicular to the pressure oil passages 26, 28. Although the pressure oil passage is shortened, the cylinder block 6, the eccentric cam 10, the plunger pump 16 and the like may be separately formed and built into the case 1.

Further, since the plunger pump 16 and the oil tank 12 are vertically arranged in close proximity to each other on one axis, suction and pressurization can be performed very efficiently, and even if air is mixed in, it may remain in the suction port 16. Without the inhalation effect does not decrease.

Further, if the hydraulic oil 13 is supplied from the oil supply port 24 formed at the upper end of the space 9 in which the eccentric cam 10 is fitted,
The hydraulic oil 13 can be filled or replenished in the oil tank 12 from the space 9 through the passages 46 and 47.

In this embodiment, two passages 46 and 47 leading from the space 9 to the oil tank 12 are formed, and the hydraulic oil 13
At the time of refueling, the air in the oil tank 12 is easily discharged to the outside to facilitate refueling.

Furthermore, in this embodiment, the hydraulic oil 1 is also provided in the space 9.
3, the bearing 43, the eccentric cam 1 are filled.
0 and the plunger 18 operate smoothly due to their lubricating action.

The present embodiment is an example of the present invention, and the pushing member 36 is provided in the vicinity of the grip portion 32 across the case 1, but it can be easily grasped by the hand holding the grip portion 32. The operating rod 3 which is projected from the outer surface of the case 1 by operating
It goes without saying that another configuration may be used as long as the end portion of 1 can be opened / closed via the connecting member 37.

[0039]

According to the present invention, the end portion of the working rod connected to the valve element of the manual return valve connected to the hydraulic circuit built in the handheld case is projected from the outer surface of the case. At the same time, a pushing member is provided in the vicinity of the grip portion of the case, and a gripping member is provided between the pushing member and the end portion of the operating rod so as to interlock them. It is possible to provide a hand-held tool which can be operated easily with one hand while operating the return valve in a state of being grasped and which has extremely excellent operability and is easy to use.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is an enlarged view in which a part of FIG. 1 is cut away.

FIG. 3 is an enlarged cross-sectional view taken along the line III-III in FIG.

FIG. 4 is an enlarged cross-sectional view taken along the line IV-IV of FIG.

5 is a hydraulic circuit diagram in the embodiment shown in FIG. 1. FIG.

[Explanation of symbols]

 1 Case 29 Return Valve 30 Valve Body 31 Actuating Rod 32 Gripping Part 36 Pushing Member 37 Connecting Member

Claims (1)

[Claims] 1. An end portion of a working rod connected to a valve element of a manual return valve connected to a hydraulic circuit built in a hand-held case is projected from an outer surface of the case,
A hand-held hydraulic system characterized in that a pushing member is provided in the vicinity of the grip portion of the case, and a connecting member for interlocking the pushing member and the end portion of the working rod is interposed. tool.