JPH078143Y2 - Breaker chisel - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to improvement of a chisel for a breaker used in the field of civil engineering and construction.

[Conventional technology and problems]

It has been known that a rocker or the like is crushed by attaching a breaker to a construction machine and inserting a chisel into a holder of the breaker. This chisel constitutes a single steel pile having a tail portion inserted into the holder, a pile portion projecting from the holder, and a working portion at the tip of the pile portion.

Generally, the breaker is used downward or sideways, and the rocker is crushed by the impact of the chisel while reciprocating the breaker by hydraulic pressure. That is, when the breaker is moved forward, the chisel pierces the rock formation, and when the breaker is moved back, the chisel is extracted from the rock formation. The rock layer is crushed by repeating this operation.

By the way, for example, in tunnel construction and the like, the breaker is used not only in the downward and lateral directions but also in the upward direction. In the case of this upward use, rocks and earth and sand generated by crushing rock layers fall on the chisel and breaker. Dust of rocks and earth and sand that fell, upward breaker,
That is, the tip end of the holder in which the chisel is inserted is hit.
Therefore, the dust will enter the inside of the holder through a minute gap in the chisel insertion portion.

However, if such dust is allowed to enter the inside of the holder, it adversely affects the chisel fastening mechanism and the like in the holder, and causes failure of these mechanisms.

[Means for Solving the Problems]

The present invention provides a breaker chisel that prevents dust from entering the inside of the holder as described above. The means for constructing the chisel includes a tail portion (4) inserted into the holder (2), Piles (5) protruding from the holder (2)
And a working portion (6) at the tip of the pile portion (5), the pile portion (5) having a large diameter held by a holding collar (11) inserted into the inner peripheral portion of the holder (2). A breaker chisel including a portion (5a) and a small diameter portion (5b) connected to the large diameter portion and reaching a working portion (6), wherein a holder (2) is attached to the holding collar (11).
A flange (11a) is provided extending along the tip surface of the ring-shaped member (1a) on the large diameter portion (5a) of the pile portion (5).
A flange (14) composed of 5) is externally inserted, and a small gap S is provided between the flange (14) and the flange (11a), and a pile portion (5) is formed on the inner peripheral portion of the flange (14). ) Is formed from the large diameter portion (5a) toward the small diameter portion (5b) to form a taper surface (16) that gradually decreases in diameter, and a taper surface conforming to the taper surface (16) is formed on the pile portion (5). It is provided on the large diameter part (5a) and is formed by fitting both tapered surfaces.

〔Example〕

 An embodiment of the present invention will be described in detail below with reference to the drawings.

As shown in FIG. 3, a chisel 3 is inserted into the breaker 1 via a holder 2.

As shown in FIG. 1, the chisel 3 includes a tail portion 4 to be inserted into the holder 2, a pile portion 5 projecting from the holder 2, and a working portion 6 provided at the tip of the pile portion 5. Cage, which constitutes one steel pile.

The holder 2 includes a holding cylinder 7 that receives the tail 4 of the chisel 3,
The holding cylinder 7 and a cylinder 8 extending in the tail end direction are provided. A pair of recesses 9 is formed in the middle of the tail portion 4 of the chisel 3 in the radial direction, and a pair of recesses 9 is formed in the middle of the forming portion 4 in the radial direction. A pair of pierced pins 10 are engaged with the recesses 9, respectively. The tip end side and the rear end side of the chisel tail portion 4 with the concave portion 9 sandwiched therebetween are held by holding collars 11 and 12 inserted into the inner peripheral portion of the holding cylinder 7 of the holder 2, respectively. The tip-side holding collar 11 has a collar 11a extending along the tip surface of the holding cylinder 7. A hydraulic piston 13 is inserted into the cylinder 8 of the holder 2, and the piston 13 is pressed against the tail end 4a of the tail portion 4 of the chisel 3 to fix the chisel 3 in the holder 2 in a stationary state.

The pile portion 5 of the chisel 3 has a large diameter portion 5a extending in the same diameter as the tail portion 4 held by the holding collar 11 on the tip side, and the large diameter portion 5a.
And a small-diameter portion 5b connected to the working portion 6.

A flange 14 is provided on the large diameter portion 5a of the pile portion 5 of the chisel 3 at a position near the tip of the holder 2 (the collar 11a of the holding collar 11). This flange 14 is a chisel 3
Although it can be integrally formed by shaving from the steel material as the material, it is preferable that the ring-shaped member 15 is formed separately from the chisel 3 and is detachably attached to the large diameter portion 5a of the pile portion. . At this time, the ring-shaped member 15 may be made of steel similar to the chisel 3, but may be made of nylon or other synthetic resin.

As shown in FIG. 2, the ring-shaped member 15 that constitutes the flange 14 has a tapered surface 16 that gradually decreases in diameter from the tail end direction of the pile portion 5 toward the tip end direction. That is, the tapered surface 16 has a large-diameter opening 16a on the rear end side and a small-diameter opening 16b on the front end side. The diameter relationship between the tapered surface 16 and the pile portion 5 is large-diameter opening portion 16a = pile. It is a large diameter portion 5a of the portion 5. As a result, by forcibly inserting the chisel 3 into the ring-shaped member 15, the tapered surface 16 is wedge-shaped fitted on the outer peripheral surface of the large diameter portion 5a of the pile portion 5. The ring-shaped member 15
A chamfered inclined surface 17 is formed on the front surface in the vicinity of the outer periphery of the.

Further, as shown in the first illustration, the ring-shaped member 15 is attached to the large-diameter portion 5a of the pile portion 5 in an externally fixed state, and the ring-shaped member 15 and the tip of the holder 2 (the collar 11a of the holding collar 11). And an air gap S between them and. The space S may be approximately the same as the wall thickness of the ring-shaped member 15, but is preferably smaller than the wall thickness. In order to secure such a minute void S, a ring-shaped member
A soft or elastic collar may be interposed between 15 and the collar 11a, but upon wedge coupling by the tapered surface 16 of the ring-shaped member 15 as described above, the ring-shaped member 15 left a void S. It is advisable to design the taper gradient so as to stop at a predetermined position.

According to the chisel 3 according to this embodiment, the ring-shaped member 15
By forcibly inserting the chisel 3 into the ring-shaped member 15, the ring-shaped member 15 is externally attached and fixed by the tapered surface 16 at a predetermined position leaving a slight gap S between the tip of the holder 2 and the flange 14 formed therein. To do.

Therefore, when the breaker 1 is used in the upward direction, the falling dust of rocks or earth and sand does not enter the inside of the holder 2 through the minute space between the chisel 3 and the holder 2 (holding collar 11). Holder 2 deflected by flange 14
To the outer peripheral side of. That is, the flange 14 functions as a protector that protects the holder 2 from such undesired dust and a deflector that guides the dust to a position outside the opening of the holder 2, and protects the mechanism inside the holder 2.

When the inserted flange 14 is unnecessary, or when the flange 14 is damaged and needs to be replaced, the breaker 1 is directed downward to impact the chisel 3 or impact the ring-shaped member 15 with a hammer or the like. If given, the ring-shaped member 15
Can be removed from the chisel 3.

[Effect of device]

According to the present invention, the flange 14 functions as a protector and a deflector, and prevents dust from entering the inside of the holder 2 through the tip opening. Therefore, even when the breaker 1 is used facing upward, 2 can be protected and its failure can be prevented.

According to the present invention, in carrying out the present invention, the flange 14
Can be manufactured inexpensively and easily, and can be implemented at low cost. Further, by adopting the wedge coupling with the tapered surface, it becomes possible to insert the ring-shaped member 15 constituting the flange into the conventional commercially available chisel 3 as it is, and to provide versatility.

According to the present invention, the flange 14 has the space S between the tip of the holder 2 and the impact received by the chisel 3 during the breaker work is not directly transmitted to the tip of the holder 2 via the flange 14, There is no risk of damaging the outside of 2.

Further, according to the present invention, the flange 14 is guided from the tip of the chisel 3, and the inner peripheral surface of the flange 14 is fitted into the large diameter portion 5a, so that the flange 14 can be inserted and attached with one touch. At this time, since the taper surface 16 of the flange 14 is fitted to the taper surface of the large-diameter portion 5a, the coupling is strong and it is easy to stop at the position where the space S is left.

On the other hand, the flange 14 can be removed while the chisel 3 is attached to the holder 2. For example, it is possible to easily remove the flange 14 from the fitted state by driving a jig into the space S with a hammer or the like. At this time, since the tip end surface of the holder 2 is protected by the collar 11a, it is not damaged by the driven jig.
Moreover, if the collar 11a is damaged, the holding collar 11
Since it suffices to replace only, there is an excellent effect that the cost due to damage can be relatively small.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is an explanatory view showing a relationship between a ring-shaped member and a chisel pile portion, and FIG. 3 is an external view of a breaker having a chisel inserted therein. . 2 ... Holder, 3 ... Chisel, 4 ... Tail part, 5 ... Pile part, 5a ... Large diameter part, 6 ... Working part, 7 ... Holding tube, 11 ...
… Holding collar, 11a… Tsuba, 14… Flange, 15… Ring member, 16… Tapered surface.

Claims (1)

[Scope of utility model registration request] 1. A tail portion (4) inserted into a holder (2),
A pile portion (5) protruding from the holder (2) and a working portion (6) at the tip of the pile portion (5) were provided, and the pile portion (5) was inserted and attached to the inner peripheral portion of the holder (2). A breaker chisel comprising a large diameter portion (5a) held by a holding collar (11) and a small diameter portion (5b) connected to the large diameter portion and reaching a working portion (6), wherein the holding collar (11 ) Is provided with a collar (11a) extending along the tip surface of the holder (2), and the pile portion (5) is provided.
A flange (14) composed of a ring-shaped member (15) is externally inserted into the large diameter part (5a) of the flange (14) and the flange (11).
A small gap S is provided between the large diameter part (5) of the pile part (5) and the inner peripheral part of the flange (14).
A taper surface (16) having a gradually decreasing diameter is formed from a) toward the small diameter portion (5b), and a taper surface conforming to the taper surface (16) is formed on the large diameter portion (5a) of the pile portion (5). A chisel for a breaker, characterized in that it is provided at the bottom and is fitted with both tapered surfaces.