Abstract:
A breach apparatus is provided for breaching a closure or other obstacle. The breach apparatus includes a body forming a cavity, an end cap attached adjacent a first end of the body and a manifold attached adjacent a second end of the body and in fluid communication with the cavity, a ram assembly including a ram head attached to a first end of a battering shaft, a battering piston attached to a second end of the battering shaft within the cavity of the body, a mass piston movable within the cavity of the body between the manifold and the battering piston, a trigger mechanism in communication with the manifold, and a supply tank in fluid communication with the manifold.
Abstract:
The invention relates to a hand-held demolition tool (1) comprising a cylinder (2), a rear handle (6) and a flexible coupling (4) for the flexible connection of the cylinder (2) and the rear handle (6). According to the invention, the flexibility of the coupling (4) is arranged such that it allows flexibility only in the property pivot action between the cylinder (2) and the rear handle (6) around a rigid theoretical axis (9).
Abstract:
A pneumatic impact device and method provide a high powered striking force against a target object. The device includes a core shell that houses a piston sub-assembly and a sear arm sub-assembly, and that further defines a forward gas chamber and a rearward gas chamber. The rearward gas chamber is loaded with compressed fluid via a handle actuator. A mostly external sear trigger assembly responds to the impact of a striker plate against the target object, thereby releasing a sear arm that then releases a piston, which is then accelerated forward by the compressed fluid charge. The device can be re-set manually via compressed fluid (e.g., air) in one embodiment, or automatically via a spring mechanism in another embodiment.
Abstract:
A hydraulically driven hammer has a piston which contains metal piston rings on a constant diameter section. The housing has a plurality of axially spaced apart radial ports that extend through the housing into the bore. A valve supplies fluid to the ports to control reciprocation of the piston.
Abstract:
A percussive tool comprises a percussion mechanism and a pressure pulser. The percussion mechanism has a hollow housing with a piston hammer arranged thereinside to form two chambers of variable volume. The pressure pulser has a hollow housing and a fluid displacer defining inside the housing a working chamber adapted to alternately communicate with a source of gaseous fluid and the interior of the percussion mechanism. The fluid displacer is intended for forced displacement inside the housing to transmit to the chambers of the percussion mechanism a pulsed pressure of the gaseous fluid which causes the piston hammer to reciprocate. The interior of the percussion mechanism is isolated from the outside, whereas the working chamber of the pressure pulser communicates with at least one of the chambers of the percussion mechanism, the chambers of the percussion mechanism continuously intercommunicating by way of a restrictor passage.
Abstract:
The invention relates to a process and apparatus for ridding the worn anode butts of electrolysis bath crusts which adhere to them.The apparatus essentially comprises a jack supporting a pneumatic drill equipped with a percussion tool. The jack is supported by a movable and orientatable arm.Application to the recovery of worn anodes from igneous electrolysis cells for the manufacture of aluminium.
Abstract:
A hydraulic impact tool providing improved force absorption for facilitated manipulation by an operator. In the illustrated embodiment, the tool comprises a tamper which provides substantial tamping force with minimum vibration and uncontrolled bounce. The tool utilizes a hydraulic power system for improved noise reduction and minimizaton of fatigue. The tool provides a forward stroke wherein the force is applied for a preselected time, and a retraction stroke wherein the moving elements are retracted to a preselected position. The tool is adapted for use with a wide range of load resistances.
Abstract:
An hydraulic tool for mining and construction work designed to effect hydraulic reciprocating action of a piston to which a work implement is attached. The tool is illustrated as a rock drill. The tool avoids the usual impacting action and accompanying noise of a reciprocating piston hammer against a work implement. A motor operating independently of the reciprocating piston functions to rotate the piston and the work implement attached to the latter while the piston is reciprocating. A bulk oil accumulator forms part of the housing of the tool in which the piston reciprocates; and a power driven control valve determines the frequency of reciprocation and speed of the piston.
Abstract:
A percussion bit assembly for use with a mechanically actuated hammer, and of a mechanically actuated hammer including the above-mentioned percussion bit assembly and an exemplary actuator. The percussion bit assembly is constructed to include a percussion bit and a plurality of toroidal springs mounted to provide lateral reactive forces in response to lateral movement of the percussion bit. A brake structure is also included which directly engages the percussion bit.
Abstract:
A hydraulic hammer for driving a demolition tool is disclosed. The hammer carries a piston which reciprocates in a cylinder. High pressure fluid drives the hammer to a retracted position to compress an air spring. The piston is momentarily held in the retracted position while an annular valve sleeve disposed about the piston is automatically moved downwardly by differential fluid pressure to open an annular passageway around the piston to permit the fluid to freely bypass the piston. The piston is then released so that the stored energy rapidly accelerates the hammer through an impact stroke without significant impedance from fluid and without displacing fluid from the cylinder. Since high pressure fluid is required only on the retraction stroke, the volume of fluid necessary to operate the hammer is essentially reduced by 50 percent, thus permitting either the force or frequency to be doubled for a given high pressure fluid source. A safety shuttle valve is also included which is cooperable with the tool member to bypass pressure fluid to reservoir until a predetermined load is imposed on the tool.