Tool driving or impacting – Drive controlled by relative axial movement of tool – Drive motor controlled
Patent
1990-09-14
1992-01-21
Watts, Douglas D.
Tool driving or impacting
Drive controlled by relative axial movement of tool
Drive motor controlled
173134, 1731621, B25D 904
Patent
active
050820672
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an apparatus with two limit positions generating a reciprocating motion, the apparatus comprising a first moving part and a second moving part, between which parts a pressurized medium, appropriately compressed air, is arranged simultaneously to displace the moving parts in mutually opposite directions.
BACKGROUND ART
It is previously known in this art to employ two mutually displaceable masses or bodies for the purpose of reducing the vibrations generated in a tool. Examples of such prior-art technology are revealed in Swedish patent No. 7603252-3.
To some extent, such prior-art solutions have resulted in reduced vibrations at low loads, but the vibrations increase with greater loads. Moreover, such prior-art solutions suffer from the drawback that they consume unnecessarily large amounts of drive medium, partly because only the one moving part carries out useful work during its displacement, and partly because the drive medium is continually applied between the moving parts. While another prior-art solution, disclosed in Swedish patent No. 8204044-5, shows a supply valve, this valve is only shut off in conjunction with the one limit position, a certain reduction in the air consumption being hereby obtained as compared with the chisel device according to the first-mentioned Swedish patent. A further drawback inherent in the above-mentioned prior-art types of apparatus is that they are difficult to "creep-start" and that they undergo a major change in operational mode on contact with the workpiece which is to be processed, for instance the vibration level changes on impacts of varying power by the apparatus against the workpiece. In addition, the prior-art types of apparatus suffer from difficulties in providing the necessary stroke lengths and kinetic energies for specific requirements.
OBJECT OF THE INVENTION
The object of the present invention is to reduce or obviate the above-outlined drawbacks inherent in prior-art types of apparatus for generating a reciprocating motion.
SOLUTION
The object of the present invention will be attained if the apparatus mentioned by way of introduction is characterized in that at least the first moving part is actuated, by a constantly present force, for example in that the pressure of the drive medium is applied on at least one surface of the first moving part, in the forward direction under tensioning of an associated force accumulator, for instance a spring; and that the above-mentioned pressurized drive medium is applied between the first and second moving parts such that the second moving part is disposed, in the forward direction, to tension an associated force accumulator under simultaneous cancelling of the load on the force accumulator associated with the first moving part. A particularly advantageous embodiment of the present invention will be realized if the above-mentioned pressurized drive medium is arranged to be supplied intermittently between the above-mentioned moving parts solely in connection with the limit positions of the apparatus, preferably solely in connection with the one limit position, at which the above-mentioned first and second moving parts are positioned closest to one another, and if one or both of the moving parts are arranged, by cooperation, to release, in connection with at least the one limit position of the apparatus, a sealing member for the supply of the pressurized drive medium between the above-mentioned moving parts in connection with the one limit position of the apparatus.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The nature of the present invention and its aspects will be more readily understood from the following brief description of the accompanying drawings, and discussion relating thereto.
In the accompanying drawings:
FIG. 1 is a cross-section through an apparatus according to the present invention; and
FIGS. 2 and 3 show further alternatives for tool sockets and mounts etc. In respect of FIG. 1, it should be observed that the apparatus according to FIG.
REFERENCES:
patent: 526342 (1894-09-01), Carlinet
patent: 3792740 (1974-02-01), Cooley
patent: 4460051 (1984-07-01), Widmer
patent: 4592431 (1986-06-01), Tornqvist
Dexter C.
Watts Douglas D.
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