Tool driving or impacting – Impacting devices – With means to cause or control advance of hammer head
Patent
1986-12-24
1988-11-22
Schran, Donald R.
Tool driving or impacting
Impacting devices
With means to cause or control advance of hammer head
173124, B25D 1700
Patent
active
047858931
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a method and apparatus for breaking composite material such as cement into a plurality of pieces.
BACKGROUND OF THE INVENTION
Numerous types of apparatus have been devised for breaking surfaces such as concrete or asphalt pavement. Such apparatus may be referred to as demolition apparatus.
Known demolition apparatus are shown in U.S. Pat. Nos. 3,319,724 and 3,358,779. These known demolition apparatus are attached to a boom of an earthmoving machine for support of the apparatus. These known apparatus require a separate motor for operation thereof.
It is an object of this invention to provide demolition apparatus which is adapted to be attached to a boom of an earthmoving machine, but in which the demolition apparatus is operated by movement of the boom, without the use of a separate motor for operation of the demolition apparatus.
It is another object of this invention to provide such demolition apparatus which is capable of applying large forces in consideration of the physical size and weight of the apparatus.
It is another object of this invention to provide such demolition apparatus which can be easily and readily attached to a boom of an earthmoving machine and detached therefrom.
It is another object of this invention to provide such demolition apparatus which can be operated at any desired angle, such as vertical operation for demolition of a pavement and such as horizontal operation for demolition of a wall or the like.
Another object of this invention is to provide such demolition apparatus which can be constructed at relatively low costs and which is long lived.
Other objects and advantages of this invention reside in the construction of parts, the combination thereof, the method of operation and the manner of use, as will become more apparent from the following description.
SUMMARY OF THE INVENTION
Demolition apparatus of this invention is adapted to be attached to a boom or boom arm of any suitable machine, such as an earthmoving machine. The demolition apparatus is operable by movement of the boom of the machine and does not require separate motor means for operation of the demolition apparatus.
The demolition apparatus compresses a housing which is attachable to the boom of a machine. An axially movable power plunger which extends from the housing. A power spring urges the power plunger in a direction from the housing. An axially movable actuator plunger extends from the housing. A latch member is pivotally attached to the actuator plunger and engages a portion of the power plunger and normally maintains the position of tee power plunger with respect to the actuator plunger.
In operation, the housing is moved toward a pavement or wall or the like which is to be demolished. As the housing is moved toward the pavement, the actuator plunger comes into engagement with the surface to be demolished. However, the power plunger is spaced from the surface. As continued movement of the housing toward the pavement surface occurs, the actuator plunger remains in engagement with the pavement, and the latch which is attached to the actuator plunger remains in engagement with the power plunger and maintains the position of the power plunger with respect to the surface. Therefore, continued movement of the housing toward the surface causes the actuator plunger and the power plunger to be positioned upwardly within the housing. Such relative movement between the power plunger and the housing is against the forces of the power spring.
This movement of the housing toward the surface continues until an abutment member comes into engagement with the latch which is attached to the actuator plunger. As the latch comes into engagement with the abutment member, the latch is operated and is released from engagement with the power plunger. When this occurs, the power spring instantaneously and rapidly forces the power plunger to travel into striking engagement with the pavement. The power plunger strikes the pavement with the energy of the power spring.
In another aspect
REFERENCES:
patent: 2844006 (1958-07-01), Lutz et al.
patent: 3319724 (1967-05-01), Cunningham
patent: 3358779 (1967-12-01), Cunningham
patent: 3394856 (1968-07-01), Mitchell
patent: 4076081 (1978-02-01), Schnell
Caterpillar Inc.
Glastetter Calvin E.
Schran Donald R.
Wolfe James L.
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