Motors: expansible chamber type – Relatively movable working members with one having motive... – One working member oppositely biased by another
Patent
1987-08-21
1989-04-11
Garrett, Robert E.
Motors: expansible chamber type
Relatively movable working members with one having motive...
One working member oppositely biased by another
91189R, 91189A, 91291, 91308, F01B 2504, F15R 1122, F01L 2500, F01L 1500
Patent
active
048195421
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to power impulse systems designed for generating force impulses of a preset frequency and intensity, which act upon the medium being worked so as to deform it, and, more particularly, to percussive tools for creating impact impulses of high power.
Background of the Invention
Known in the art is a percussive device (U.S. Pat. No. 4,370,916, IPC F03 C 1/04, published Feb. 1, 1983) for creating impact impulses to act upon the medium being worked, which device comprises a housing, a striker having a shank, a power cylinder accommodating the striker shank and filled with a compressed gas, a striker gripping mechanism and a striker backward stroke drive in the form of a plurality of hydraulic cylinders having their rods connected to the gripping mechanism and moving under the action of a working fluid fed to the interior space of the hydraulic cylinders during a backward stroke of the striker, and under the action of the compressed gas filling the power cylinder at the moment of the gripping mechanism movement to follow the striker after the forward stroke thereof.
This prior art device operates as follows. When the power cylinder is being filled with the compressed gas the striker is forced by the gas to move to the extreme frontend position. If the interior spaces of the hydraulic cylinders are then connected to a discharge line, the rods under the action of compressed gas pressure applied to their end faces accommodated in the power cylinder will move forward together with the gripping mechanism which will engage the striker at the end of this movement. After this it is necessary to connect the interior spaces of the hydraulic cylinders with a working fluid source. The working fluid fed to the interior spaces of the hydraulic cylinders forces the rods together with the gripping mechanism and the striker coupled therewith to move in the opposite direction compressing still further the gas present in the power cylinder thereby accumulating potential energy. In the extreme rearend position the gripping mechanism releases the striker which under the action of the compressed gas acting upon the end face of the shank is accelerated to move forward and at the end of this movement to deliver a blow at the medium being worked, i.e. the striker performs a working stroke. Then the interior spaces of the hydraulic cylinders are again connected to the discharge line, and the above-described cycle is repeated.
The prior art device has a rather perfect striker backward stroke drive, but for delivering every next blow it is necessary to switch over twice the means which communicate the interior spaces of the hydraulic cylinders with the working fluid source and with the discharge line. Because of such switchings over of said means the frequency of blows is reduced and, as a result, the device output is also reduced.
Summary of the Invention
The invention is aimed at providing a percussive tool wherein connection of interior spaces of hydraulic cylinders with a working fluid source (to cock a striker) and with a discharge line (to move a gripping mechanism to follow the striker after its working stroke) is accomplished automatically.
The percussive tool creates impact impulses which act upon the medium being worked so as to change its form. The tool comprises a housing accommodating a striker adapted to reciprocate, having a front end portion for acting upon the medium being worked and a shank arranged in a power cylinder secured to the housing. The housing is filled with a compressible fluid under pressure for accumulating potential energy when compressed in the process of cocking the striker and for acting upon the end face of the shank of the striker during its working stroke. A striker cocking drive with a gripping mechanism incorporates at least one hydraulic cylinder secured with its body on the periphery of the housing and has a rod. One end of the rod is received in an interior space of the hydraulic cylinder, while the other end is received in an interior sp
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patent: 2726642 (1955-12-01), Zinty et al.
patent: 3185040 (1965-05-01), Ligon
patent: 3774502 (1973-11-01), Arndt
patent: 3800664 (1974-04-01), Phillips
patent: 3845694 (1974-11-01), Berg
patent: 4343368 (1982-08-01), Fadeev et al.
patent: 4370916 (1983-02-01), Mitin et al.
Ermilov Nikolai P.
Fadeev Petr Y.
Fadeev Vladimir Y.
Korobkov Vladeen V.
Kulagin Rim A.
Garrett Robert E.
Spetsialnoe Konstruktorskoe Bjuro Gidroimpulsnoi Tekhniki Sibirs
Williamson Mark A.
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