Solid material comminution or disintegration – Apparatus – Reciprocating comminuting surface
Patent
1983-07-20
1986-01-07
Goldberg, Howard N.
Solid material comminution or disintegration
Apparatus
Reciprocating comminuting surface
173139, 267137, B02C 100
Patent
active
045629749
DESCRIPTION:
BRIEF SUMMARY
This invention relates generally to apparatus for working materials, such as reducing rock by fracturing it into small sections suitable for handling, and particularly to a tool assembly which can be used in that apparatus.
One such type of apparatus and tool assembly therefor has been disclosed in Applicant's earlier Australian Pat. No. 522,890. That tool assembly includes a tool having limit means by which the tool is secured to a tool mounting for limited movement relative to the mounting between a tool operative position and a tool operated position, the tool being engageable with material to be worked and during a material working stroke moving from the operative position to the operated position under action of an applied working force to work the material. The apparatus includes a frame adapted to be mounted on a vehicle, the above tool assembly mounted on that frame, and a striker block adapted to be raised so that it is spaced from the tool and allowed to fall under gravity to strike and apply the working force to the tool thereby to move the tool from its operative position to its operated position.
Whilst the apparatus of Applicant's prior patent is generally satisfactory in operation, it has been found that, if the striker block is operated to move the tool from its operative to its operated position during a rock breaking operation, and particularly when the tool is not properly positioned on the rock or the rock is easily fractured, the striker block tends to move the tool to its operated position with such a working force that potentially damaging stresses and vibrations are transmitted through the apparatus. This is the result of absorption by the tool mounting and apparatus of the working forces once the tool has reached its operated position and further movement thereof is resisted by the limit means and tool mounting.
It is an object of the present invention to avoid that disadvantage of the above type of apparatus and tool assembly through the provision of an alternative simple tool assembly.
With the above object in mind, the present invention provides a tool assembly for working a material, including: a tool mounting having a fixed section, and a movable section mounted for movement relative to the fixed section in a working direction and an opposite return direction; a tool mounted on the movable section for movement relative thereto in the working and return directions, and having limit means for limiting that relative movement of the tool relative to the movable section to between a tool operative position and a tool operated position, the tool during a working stroke being engaged with material to be worked and moved in the working direction from the operative position to the operated position and thereafter in unison with the movable section relative to the fixed section under action of an applied working force thereby to work the material; and, biasing means acting between the fixed section and the movable section to absorb applied tool working forces transferred from the tool to the movable section, and to provide a restoring force to the movable section for returning the movable section in the return direction upon conclusion of the working stroke of the tool.
Preferably, the tool mounting is generally elongated with the fixed section and movable section thereof being longitudinally movable relative to each other in the working and return directions. That longitudinal movement is preferably coincident with the movement of the tool so that unitary movement of the tool and nose section is in the working direction during a material working stroke.
Preferably, the tool mounting has generally tubular fixed and movable sections telescopically movable one relative to the other, the movable section telescopically sliding relative to the fixed section during movement thereof in the working and return directions. In one embodiment, those sections are of generally annular configuration with the movable section telescopically movable in the fixed section. In one embodiment, the movable se
REFERENCES:
patent: 2899934 (1959-08-01), Salengro
patent: 3010430 (1961-11-01), Allen et al.
Bezette Ian G.
Sugden David B.
Bennetto John
Bezette Ian G.
Eley Timothy U.
Goldberg Howard N.
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