JPH0723181Y2 - Shock absorber for impact tool - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shock absorbing device for an impact tool such as a hydraulic breaker used for crushing a building or the like.

[0002]

2. Description of the Related Art In buffering shocks and vibrations transmitted to a tool body of an impact tool such as a hydraulic breaker, conventionally, for example, between the tool body and a pair of plates arranged in parallel with the tool body sandwiched therebetween. A lumpy elastic body was seated on.

[0003]

The above-mentioned shock absorbing structure has a problem that the shock absorbing effect is remarkably reduced when a gap is generated between the tool body and the elastic body due to the variation in the distance between the plates. It is an object of the present invention to solve the above problems and effectively dampen vibrations and shocks in a striking tool.

[0004]

A shock absorber of a striking tool according to the present invention has a fluid chamber in which a fluid is sealed, is formed to be hollow and elastically deformable, and is expanded in the thickness direction by the fluid in the fluid chamber. It has a configuration in which the deformed cushioning member is sandwiched in a gap between the tool main body and the grip plate installed along the tool main body.

[0005]

The fluid in the fluid chamber has a fluid chamber in which the fluid is sealed, and a hollow, elastically deformable cushioning member is sandwiched in the gap between the tool body and the gripping plate installed along the tool body. The cushioning member expanded and deformed by is pressed against the tool body.

[0006]

Since the present invention is configured as described above, the cushioning performance of the cushioning member itself and the cushioning of the fluid in the cushioning member have the impact force and the vibration transmitted to the tool body during the crushing work. It is possible to properly absorb and effectively buffer by a buffering effect that combines performance and performance. Further, since the cushioning member can be expanded and deformed to a required thickness and sandwiched between the tool body and the grip plate, even if the size of the gap between the tool body and the grip plate varies, this variation can be reduced. By absorbing the cushioning member by adjusting the thickness of the cushioning member, the cushioning member can be accurately pressed against the tool body, and can be always sandwiched between the tool body and the grip plate without any gap.

[0007]

Next, one embodiment of the present invention will be described with reference to the drawings. In a striking tool (hydraulic breaker) D that is attached to the tip of an arm of a hydraulic excavator and is used for crushing work, a cylinder 2 in which a piston (not shown) that is hydraulically driven to reciprocate is inserted in a tool body 1 having a substantially prismatic shape. And the front cap 3 connected to the tip of the cylinder 2.
And a back cap 4 connected to the base end of the cylinder 2 are formed in series, and a chisel 5 that is repeatedly hit by the piston is inserted and attached to the tip of the tool body 1.

A casing 6 in which the tool body 1 is inserted is installed along the tool body and connected in a rectangular tubular shape.
A body wall 6a having two grip plates 25 and having a reduced cross-sectional area near the tip, and a front lid 6b which is connected to the tip of the body wall 6a and into which the chisel 5 is inserted have a hollow shape. The base plate 8a of the connecting bracket 8 is formed and the base end portion of the casing 6 is connected to the tip end of the arm of the hydraulic excavator.
Has been concluded.

An elastic seal member 9 for sealing the gap between the front cap 3 and the chisel insertion hole 6c formed in the front lid portion 6b of the casing 6 is fitted at the tip of the casing 6.

A box-shaped holder 11 installed facing the back cap 4 in the vicinity of the base end of the body wall portion 6a of the casing 6 has a bolt 12 inserted into the body wall portion 6a and a screw threaded on the bolt 12. It is fastened to the body wall portion 6a by the fitted nut 13 and is provided inside the holder 11 with elastic bodies provided on both sides of a partition wall 15a formed in the central portion of the holder 11 and having bolts 12 inserted therethrough. The vibrating member 14 is inserted in a state of elastically contacting the back cap 4.

The tool body 1 is attached to the body wall 6a of the casing 6.
Of the switching valve 16 and the accumulator 17 attached to the cylinder 2 of the vehicle, the vicinity of the base end portion of the front cap 3 and the back cap 4 are provided with windows 18 to 18, respectively. A cover 19 attached to the body wall portion 6a closes it in a hermetic manner.

The cover 19 has a U-shaped cross section by a cover plate 19a attached to the outer surface of the body wall 6a and a pair of side plates 19b connected to the cover plate 19a and both side edges at right angles. The body wall portion is formed by a pair of connecting pins 21 that are formed and penetrate the front and rear end portions of the side plate 19b on one side and are inserted into the body wall portion 6a, and bolts 22 that are respectively screwed into the two connecting pins 21. It is fastened to 6a.

In the gap between the front cap 3 and the vicinity of the front end of each holding plate 25 of the casing 6, a set of four is attached to the inner side surface 25a of each holding plate 25 and arranged around the front cap 3. Cushioning member 2
9 to 29 are sandwiched.

The inner surface 2 of the holding plate 25 is provided in the gap between the cylinder 3 and the back cap 4 near the center and the base end of the three holding plates 25 of the casing 6.
A set of three cushioning members 29 attached to 5a are respectively sandwiched.

Each cushioning member 29 is formed of an elastic material in the shape of a hollow rectangular trapezoid so as to be elastically compressively deformable and expandable in the thickness direction, and fixed to the inner surface 25a of the holding plate 25 of the casing 6 with an adhesive or the like. Has been done.

Inside each buffer member 29, a fluid chamber 30 is formed in which a fluid such as pressure oil or air is sealed so that the volume of the buffer member 29 expands or contracts according to an increase or decrease in the amount of the stored fluid. The tool body 1 and the grip plate 2 are filled in the inside and the cushioning member 29 is expanded and deformed in the thickness direction.
It is sandwiched between 5 and each.

A feed pipe 32 for feeding the fluid into the fluid chamber 30 of each cushioning member 29 after the tool body 1 is assembled in the casing 6 is connected to each cushioning member 29. After the required amount of fluid has been fed into each fluid chamber 30, 32 is disconnected from the connecting pipe that connects the feed pipe 32 and the fluid supply source, and is placed in the casing 6 with the connecting end closed. Be trapped.

The tool main body 1 is incorporated in the casing 6 in a state where each cushioning member 29 is not expanded and deformed. In this state, the tool is placed between the inner side surface 29a of each cushioning member 29 and the outer wall surface of the tool main body 1. Gaps 31 are formed for facilitating the incorporation of the main body 1 into the casing 6. In this state, when the fluid is fed into the fluid chambers 30 through the feed pipe 32, the cushioning members 29 expand in the thickness direction. The inside surface 29a of each cushioning member 29 is deformed so that the tool body 1
And the tool body 1 is elastically gripped by the cushioning members 29 of each set.

Next, the operation and effect of the embodiment having the above-mentioned structure will be described. In this example, a tool body is provided with a plurality of buffer members 29 each having a fluid chamber 30 in which a fluid is sealed, formed in a hollow shape and elastically deformable, and expanded and deformed in the thickness direction by the fluid in the fluid chamber 30. 1 and a grip plate 25 installed along the tool body 1 are sandwiched.

Therefore, the impact force and vibration transmitted to the tool body 1 at the time of striking work are accurately performed by the combined action of the cushioning performance of the cushioning member 29 itself and the cushioning performance of the fluid in the cushioning member 29. Can be absorbed and effectively buffered.

Further, since the cushioning member 29 can be expanded to a required thickness and sandwiched between the tool body 1 and the grip plate 25, the size of the gap between the tool body 1 and the grip plate 25 varies. Even if there is, it is possible to absorb this variation by adjusting the thickness of the cushioning member 29, press the cushioning member 29 to the tool body 1 accurately, and sandwich it between the tool body 1 and the grip plate 25 without any gap. .

Further, conventionally, the gap between the tool body and the grip plate is made as small as possible in order to prevent wear and vibration, and the entire rattling is suppressed. However, in this example, if the fluid is discharged from the inside of each cushioning member 29 and the thickness of the cushioning member 29 is duplicated to the thickness before the expansion deformation,
A gap 31 is provided between the outer wall surface of the tool body 1 and each cushioning member 29.
Since they are respectively formed, the assembling work and the disassembling work of the impact tool mouth can be simplified and streamlined.

[Brief description of drawings]

FIG. 1 is an example cross-sectional view of an impact tool showing an embodiment of the present invention.

FIG. 2 is likewise a front view.

FIG. 3 is an enlarged sectional view taken along line X1-X1 of FIG.

FIG. 4 is likewise an enlarged sectional view taken along line X2-X2.

FIG. 5 is likewise an enlarged cross-sectional view taken along line X3-X3.

FIG. 6 is a view showing a state before the cushioning member is expanded and deformed X3-.
It is an X3 line expanded sectional view.

[Explanation of symbols]

 1 Tool Main Body 25 Grip Plate 29 Cushioning Member 30 Fluid Chamber D Impact Tool

Claims (1)

[Scope of utility model registration request] 1. A buffer body having a fluid chamber in which a fluid is sealed, formed in a hollow shape and elastically deformable, and expanded and deformed in the thickness direction by the fluid in the fluid chamber is provided in a tool body and the tool body. A shock absorbing device for a striking tool, characterized in that it is sandwiched in a gap between a gripping plate installed along with it.