JPH0644611Y2 - Hydraulic breaker - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a hydraulic breaker applied to crushing work such as a concrete surface.

[Prior Art] A front cap and a back cap assembled to a cylinder of a hydraulic breaker have a plurality of screw parts in which a front end side screw portion is screwed into a screw hole of the front cap and a nut is screwed into a base end side screw portion. The rod is fastened to the lower end surface and the upper end surface of the cylinder, respectively.

[Problems to be Solved by the Invention] In the side rod fastening structure described above, the screw portion on the tip side of the side rod is firmly screwed with its tip surface abutting the bottom surface of the screw hole of the front cap, so crushing work When the vicinity of the base end of the threaded portion is broken due to the striking action at the time, it is difficult to take out the cut piece that has been cut off and remains in the threaded hole, and the screw hole cannot be reused. There is.

The present invention aims to solve the above problems.

[Means for Solving the Problems] The hydraulic breaker of the present invention has a screw formed on the front cap at the tip of the side rod that fastens the front cap and the back cap of the breaker body to the lower end surface and the upper end surface of the cylinder, respectively. A threaded portion for screwing into the hole is formed, and the threaded portion is formed on the front cap so that a gap is formed between the tip surface of the side rod and the bottom surface of the threaded hole. It has a configuration in which a rotation stopping member for stopping rotation of the tip end portion of the side rod is provided in a screwed state.

[Operation] When the threaded portion formed on the tip portion of the side rod is screwed into the threaded hole formed on the front cap, a gap is formed between the tip portion of the side rod and the bottom surface of the threaded hole. The threaded portion is screwed into the threaded hole so that the threaded portion is pulled out, and in this state, the threaded portion is stopped by the detent member provided on the front cap, and the tip end portion of the side rod is screwed into the threaded hole. Secure it to the front cap without screwing it into the end.

[Effects of the Invention] Since the present invention is configured as described above, even if the vicinity of the proximal end of the threaded portion of the side rod is broken and cut by the striking action, the tip end surface of the side rod and the bottom surface 5c of the screw hole are formed. Since there is a gap between the thread and the threaded part, it is not screwed into the threaded end of the threaded hole. There is an effect that the screw hole can be retracted and easily taken out from the screw hole, the problem that the cut piece remains in the screw hole in the fixed state is solved, and the screw hole can be reused.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings.

In a breaker body B of a hydraulic breaker attached to the tip of an arm of a hydraulic excavator and crushing work by a hitting action of a chisel, a lower end surface of a rectangular cylinder 1 into which a piston which is reciprocally driven by hydraulic pressure is inserted, and A front cap 2 on the upper end surface of which is concentrically connected below the cylinder 1 and has a chisel 18 inserted therein, and a back cap which is concentrically connected above the cylinder 1 and has a gas chamber formed therein. 3 and 4 are integrally fastened together by a plurality of (four in this example) side rods 4.

A square trapezoidal connecting part near the center of the front cap 2
2a are formed, and the four corner portions 6 of the connecting portion 2a are respectively formed with upwardly opened screw holes 5 in which the female screw portion 5a and the hole portion 5b are continuously provided, and each corner portion 6 is formed. Is a lateral hole 7 communicating with the screw hole 5 and having a screw portion 7a and a small-diameter portion 7b at both ends thereof, and extends across both sides of the screw hole 5 in such a manner as to cross the corner portion 6 and be orthogonal to the axis of the screw hole 5. It is set up.

Square trapezoidal connecting portion formed at the bottom of the back cap 3
Through holes 8 are provided at the four corners of 3a corresponding to the screw holes 5 of the front cap 2.

At the tip end 4a of each side rod 4, a screw portion 10 screwed into the female screw portion 5a of the screw hole 5 of the front cap 2, and a loose insertion portion 11 loosely inserted in the drilled hole portion 5b of the screw hole 5. And are formed respectively.

The through holes 11 formed in the free insertion portions 11 of the side rods 4 so as to be orthogonal to the axis of the side rods 4 are inserted into the lateral holes 7 of the front cap 2 to be inserted into the through holes 12. Rotation preventing members 13 for fixing the front end portion 4a to the front cap 2 are respectively detachably inserted.

Each anti-rotation member 13 has a clearance between the threaded portion 10 of the side rod 4 and the tip surface 4b of the side rod 4 and the bottom surface 5c of the screw hole 5.
14 are inserted into the free insertion portions 11 at right angles in order to stop and position the distal end portions 4a of the side rods 4 in a state of being screwed into the screw holes 5 so as to be shaped, and each rotation preventing member. Each of the plugs 13 is prevented from coming off by a plug screw 17 screwed into the threaded portion 7a of the lateral hole 7.

A threaded portion 15 is formed at the base end portion of each side rod 4 inserted into each through hole 8 of the back cap 3, and the base end portion of each side rod 4 is a lock nut screwed into the threaded portion 15. 16 are respectively fastened to the connecting portions 3a of the back cap 3.

Next, the operation and effect of the embodiment having the above-mentioned configuration will be described.

In this example, the tip end 4a of the side rod 4 that fastens the front cap 2 and the back cap 3 of the breaker body B to the lower end surface and the upper end surface of the cylinder 1, respectively, is screwed into a screw hole 5 formed in the front cap 2. To form a gap 14 between the tip surface 4b of the side rod 4 and the bottom surface 5c of the screw hole 5 so as to form a gap 14 between the tip surface 4b of the side rod 4 and the bottom surface 5c of the screw hole 5. A detent member 13 is provided to detent the tip portion 4a of the side rod 4 in the fitted state.

Therefore, even when the vicinity of the base end of the threaded portion 10 of the side rod 4 is broken and cut by the striking action, a gap 14 is formed between the tip surface 4b of the side rod 4 and the bottom surface 5c of the screw hole 5. However, since the screw portion 10 is not screwed into the threaded end of the screw hole 5, the rotation stopping member 13 is pulled out from the through hole 12 to release the rotation preventing state of the cut piece remaining in the screw hole 5. Then, the cutting piece can be screwed back and easily taken out from the inside of the screw hole 5, and the problem that the cutting piece remains in the screw hole 5 in a fixed state can be solved and the screw hole 5 can be reused. There is.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a side view of a breaker body of a hydraulic breaker, and FIG.
An X-ray enlarged cross-sectional view, and FIG. 3 is an YY line enlarged cross-sectional view of FIG. 1 ... Cylinder 2 ... Front cap 3 ... Back cap 4 ... Side rod 4a ... Tip part 5 ... Screw hole 10 ... Screw part 13 ... Rotation stop member 14 ... Gap B ... Breaker body

Claims (1)

[Scope of utility model registration request] 1. A screw part for screwing into a screw hole formed in the front cap is provided at a tip portion of a side rod for fastening a front cap and a back cap of a breaker body to a lower end surface and an upper end surface of a cylinder, respectively. The front cap, the threaded portion is screwed into the threaded hole so that a gap is formed between the tip surface of the side rod and the bottom surface of the threaded hole. A hydraulic breaker, which is provided with a detent member that detents the tip.