JPH088016Y2 - Portable hydraulic tools - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a portable hydraulic tool capable of cutting, pushing, twisting, screwing, etc. with a small force by using hydraulic pressure.

(Prior Art) Various types of tools using hydraulic pressure have been proposed in the past, but there are many large-scale tools, and none of them can be freely carried around or used easily. In particular, since a hydraulic device uses an oil tank for a hydraulic jack, there is a problem that it cannot be operated upside down or used at different angles.

(Problems to be Solved by the Invention) The present invention has been made in view of the above problems of the conventional technology. The purpose of the present invention is to construct a tool body in a hollow cylindrical shape. A hydraulic tool that is convenient to carry and can be easily carried out by manual operation by incorporating a mechanical action part linked to the pushing and pulling motion of the piston in the tool body, and a hydraulic mechanism and operating part for handle operation. Is to provide.

(Means for Solving the Problem) In order to achieve the above object, a portable hydraulic tool according to the present invention has a piston rod 2a inserted into a tool body 1 having a hollow cylindrical shape so as to project from a front end. A hydraulic cylinder 3, an oil liquid storage tank 6 equipped with a variable device so as to hermetically store the oil liquid to be pumped to the hydraulic cylinder 3 and follow an increase / decrease in the amount of oil, and an oil liquid in the oil liquid storage tank 6 3 has two independent plunger type pumps 7.7, each of which has an independent hand-operated operation unit 11.11 and is symmetrically arranged so as to be pressure-fed to the piston body 2 of the piston rod 2a at the front end of the tool body 1. An action section 40 that is driven in conjunction with a push-pull operation is provided via a link mechanism 16.

Further, the tool body 1 includes a front part 1a having a hydraulic cylinder 3 built therein and a rear part 11b having an oil liquid storage tank 6 and an operating part 11.
And the front and rear parts 1a.1b are joined so as to be rotatable by a predetermined angle.

Further, it is desirable to provide a booster composed of a toggle link mechanism between the piston rod and the acting portion.

(Operation) The illustrated example shows a hydraulic cable cutter.

As shown in FIGS. 2 to 4, a bracket 14.14 facing left and right is integrally provided at the tip of the tool body 1, and a pair of left and right scissors blades 4.4 is attached to the bracket 14.14 so that the center pin 15 can be used as a fulcrum. The pair of scissors blades 4.4 have their rear end portions linked to each other by a pin 18.19 in a pantograph shape to a mounting bracket 17 fixed to the piston rod 2a side via a link piece 16.16.

Before the piston 2 is pushed, the scissors blade 4.4 is open.

In this state, the tool body 1 is held by hand, and the cutting material W is put between the scissors blades 4.4, and then the pump 7 is operated.

When the operation portion 11 of the pump 7 is reciprocated left and right, when the plunger 7a is pushed in the direction of arrow a, the oil in the pump chamber 7b pushes the check valve 8 from the hydraulic passage 20 to open the hydraulic pressure. When the oil is pumped into the hydraulic chamber 3a of the cylinder 3 and is towed in the direction of the arrow B, the oil in the oil storage tank 6 opens the check valve 9 and returns to the pump chamber 7b via the passage 21. By repeating this operation, the oil in the storage tank 6 is press-fitted into the hydraulic cylinder 3 every time the plunger 7a is pushed once. Is pushed forward (arrow C) against the bias of the spring 10.

When the piston 2 is pushed, the link piece 16.16 bends to the left and right like a panda graph, so that the scissors blade 4.4 closes with the center pin 15 as a fulcrum and gradually cuts the material W sandwiched therebetween.

When the cutting is completed, the relief valve 12 is then opened to release the pressure increase in the hydraulic cylinder 3 and the scissors blade 4.4 is opened again.

The relief valve 12 is located in the passage 22 connecting the hydraulic cylinder 3 and the storage tank 6. When the relief valve 12 is opened by operating the operation handle 13 provided at the rear portion of the tool body 1, the oil liquid in the hydraulic cylinder is immediately transferred to the storage tank 6. It recirculates, and at the same time, the piston 2 returns to its original position by the elastic force of the spring 10.

If you want to change the mounting angle of the action part 40,
Loosen 31 and screw the front part 1a of the main unit. As shown in FIG. 5, the screw 31 is fitted in the circumferential long groove 32 of the rear portion 1b of the main body, and can be adjusted by sliding within the range of 0 to 90 degrees within the limit of the length of the long groove 23.

(Embodiment) The tool main body 1 comprises a front part 1a having a hydraulic cylinder 3 and a rear part 1b having an oil liquid storage tank 6, and both parts 1a.1b are rotated and separated by screwing a screw part 23. Combine as much as possible to become one.

The oil liquid storage tank 6 is configured such that the tank volume increases or decreases as the pressure of the pump 7 is increased and the pressure of the relief valve 12 is released. The tank chamber is doubly sealed by the movable lid 24 and the outer lid 25, which are biased by the spring 30, so that the oil in the tank 6 is taken out and pumped into the hydraulic cylinder 3 when the pump 7 is operated to increase its pressure. When the relief valve 12 is opened, the spring 24 is pushed forward by the spring 30 to follow the decrease of the oil liquid, and when the relief valve 12 is opened, the spring 30 is compressed and pushed backward according to the amount of oil liquid reflux. .

Each of the check valves 8 and 9 functions to pass the oil liquid in only one direction but to prevent the oil liquid in the opposite direction, and is composed of a ball valve.

In the pump 7, the cylinder portion 7c is fixed to the outer surface of the tool body 1 so as to be orthogonal to the axis, and the plunger 7a is fitted therein.
The outer end of the plunger is connected to an operating lever 11a composed of a lever and operated by the lever. The tip of the lever 11a is attached by a pin 27 to a bracket 26 protruding on the tool body 1 side. If an auxiliary bar 28 is attached to the lever 11a in a replaceable manner and the length of the lever is extended, the lever 11a can be lightly operated with a smaller force.

The pump 7 has two independent pumps on the left and right as shown in the figure.
Installed in series. In this case, move the left and right operation parts 11 to the lever 11a.
Operate simultaneously with 11b or separately.

The action part 40 changes the linear motion of the piston into the rotary motion,
It can be used for tools with various functions such as screwing, twisting, and pressing, and can be detachably attached as an attachment.

(Effect of the Invention) Since the present invention is configured as described above,
The following effects are achieved.

It has been difficult to manually operate the pump up because the hydraulic mechanism is combined with the action part of the mechanical mechanism to boost the pressure of the hydraulic cylinder by the pump action and the action part is operated via the link mechanism. It is possible to easily and reliably cut large-diameter electric wires, wires, pipes, and other work.

It is most suitable for manual operation because the hydraulic jack has a boosting structure so that the capacity of the oil liquid storage tank can be changed according to the boosting and depressurizing of the hydraulic cylinder, and it is also easy and easy to operate.

The hydraulic cylinder and storage tank are independent,
Since the oil liquid is press-fitted through the passage in the wall body by the pump action, the whole can be freely tilted or can be used upside down.

The front portion 1a of the main body, which is the mounting side of the action portion, is freely rotatable with respect to the rear portion 1b and can be adjusted to a desired angle, so that the action portion can be made variable and easy to use.

It is small and compact, has a simple structure, has excellent durability, and is convenient to carry. It can also be implemented at low cost.

[Brief description of drawings]

FIG. 1 is a structural explanatory view of a portable hydraulic tool according to the present invention, FIG. 2 is a side view of a cable cutter, FIG. 3 is a longitudinal sectional view of the same, and FIG. 4 is a plan view of a cutter portion. FIG. 5 is a sectional view taken along the line AA in FIG. 1 ... Tool body, 2 ... Piston 3 ... Hydraulic cylinder, 4 ... Scissor blade 5 ... Link mechanism, 6 ... Oil liquid storage tank 7 ... Pump, 8.9 ... Check valve 11 ... Operating section , 12 …… Relief valve 13 …… Handle, 15 …… Center pin 40 …… Operating part

Claims (2)

[Scope of utility model registration request] 1. A hydraulic cylinder 3 in which a piston rod 2a is inserted so as to project from a front end of a tool body 1 having a hollow cylindrical shape, and an oil liquid to be pumped to the hydraulic cylinder 3 is hermetically stored and stored in an oil amount. The oil liquid storage tank 6 is provided with a variable device so as to follow the increase and decrease of the oil flow rate, and the hand-operated operation section 11.11 is independently operated to pump the oil liquid of the oil liquid storage tank 6 to the hydraulic cylinder 3 and is symmetrical. 2 independent plunger type pumps 7.7 and
A portable hydraulic tool characterized in that an action portion 40 driven in conjunction with a push-pull operation of a piston rod 2a is provided at a front end of the tool body 1 via a link mechanism 16. 2. A tool body 1 comprising a front portion 1a having a hydraulic cylinder 3 built therein, a rear portion having an oil liquid storage tank 6 and an operating portion 11.
The portable hydraulic tool according to claim 1, wherein the front and rear portions 1a and 1b are joined to each other so as to be rotatable by a predetermined angle.