Crusher

Details Crusher Crusher

1996-10-01

1998-04-14

Rosenbaum, Mark

Solid material comminution or disintegration

Apparatus

Cooperating comminuting surfaces

24110173, B02C 106

Patent

active

057382891

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to an improvement of a crusher for use in crushing a wooden house, a concrete building, etc. by attaching it to a construction machine, such as a power shovel.


BACKGROUND ART

There is known a crusher for crushing a building structure by a pair of arms driven to open and close by a hydraulic cylinder.
This type of crusher generally comprises squashing blades at front ends of the pair of opening and closing arms for clamping and crushing an iron-reinforced concrete building structure, and shearing blades in the vicinity of the pivoted central portions of the arms for cutting an iron reinforcing rod, an iron frame, etc. which are exposed by squashing the concrete building structure, as disclosed :in Japanese Patent Laid-Open Publication No. Sho 63-40061, for example.
However, since scraps obtained by merely destroying the building structure are too large to be carried and cannot be recycled, they should be broken or smashed into smaller pieces. If the crusher as described in Japanese Patent Laid-Open Publication No. Sho 63-40061 is used in smashing the scraps, there is a problem that the operating efficiency is poor.
For solving the problem, Japanese Patent Laid-Open Publications Nos. Sho 59-187976 and Hei 4-347270 proposed and known a crusher. In the crusher, a number of through holes are provided on the central region between the pivoted portion and the front end of each of the opening and closing arms, and a projection or a roller is disposed on the central region of one arm for scooping the scraps of the building structure. The arms are opened to scoop the scraps resulted from the squashing of the building structure, and large pieces of the scooped scraps are smashed into small pieces by closing the arms to throw out from the through holes.
Crushing operation of a wooden house or a concrete building structure includes the following works: iron frames; destroying the building structure or the cut iron reinforcing rods and iron frames; and as well as the concrete pieces onto the bed of a truck.
Changing an attachment suitable for the respective work to a construction machine, such as a power shovel, would be time-consuming and hence inefficient due to the work of exchanging one attachment with another. Also, using many attachments is not economical. Using the crusher as disclosed in Japanese Patent Laid-Open Publication No. Sho 63-40061, which is suitable for destroying a building structure, the above-mentioned work (1) can be performed, however, the above-mentioned works (2), (4) and (5) cannot be performed or may be performed with very low inefficiency. On the other hand, with the crusher as described in Japanese Patent Laid-Open Publications Nos. Sho 59-187976 and Hei 4-347270, which is suitable for smashing the scraps of the destroyed building structure into small pieces, the most basic work (1) cannot be satisfactorily accomplished for lack of power, although the works (2)-(5) can be performed.
Likewise, the attachments suitable for the respective works (3)-(5) are known, but the works (1) and (2) cannot be performed.
Further, in performing these works, in order to crush or grasp a horizontally extending wooden or concrete building structure, such as a beam or a ceiling surface, the opening and closing direction of the arms of the crusher must be vertical. In order to crush a vertical building structure such as a column or a wall, the opening and closing direction of the arms must be kept horizontal. Thus, it is necessary to change the opening and closing direction of the arms in accordance with the state (posture) of an object to be crushed, and it is therefore preferable that the opening and closing direction of the arms can be selected simply. In the conventional crushers, the arm support supporting the arms is rotatably mounted on a bracket to be attached to a construction machine, and the opening and closing direction of the arms; is determined by making one arm strike a fixed object to give a force to the whole crusher and rotate the arm support w

REFERENCES:
patent: 4890798 (1990-01-01), Tagawa et al.
patent: 5636802 (1997-06-01), Tagawa

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