Tool driving or impacting – Drive controlled by relative axial movement of tool
Patent
1997-06-02
1998-05-26
Smith, Scott A.
Tool driving or impacting
Drive controlled by relative axial movement of tool
173121, 173204, B25D 900
Patent
active
057552924
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION AND PRIOR ART
The present invention relates to a pressure medium operated reciprocating impact mechanism.
BACKGROUND OF THE INVENTION
Impact mechanisms of this type may be used for pressure medium operated devices working by a reciprocating movement of most various types and sizes and widely different ranges of size and frequency of the impact movement or stroke. Devices for driving in objects, such as poles and tongues, for drilling, chiselling, engraving, hammering, vibrating screens, feed shoes and similar devices as well as compacting ballast masses etc. may be mentioned as examples. Another common field of use is as a slag hacker.
Impact mechanisms of this kind are known for example through the Swedish patents 7503970-1 and 7603252-3 of the applicants as well as the Swedish patent application 9200710-3 also belonging to the applicants. Especially the impact mechanism according to the last mentioned patent application functions well, since it is distinguished from both mechanisms according to said Swedish patents by a length of the stroke being substantially exactly definable and this length is substantially independent of the pressure of the medium in question and does not vary by fluctuations thereof. Despite this advantage of the impact mechanisms according to said Swedish patent application it has as well as the other impact mechanisms already known of the type mentioned in the introduction, the disadvantage that it consumes comparatively a lot of compressed air when in operation.
The use of compressed air as a pressure medium will in the following be described by way of example, but the invention as well as the inventional task comprise the use of any pressure medium whatsoever, for example, hydraulic fluid, for operating an impact mechanism of this kind.
The comparatively high consumption of compressed air of the impact mechanisms already known of this type causes several inconveniences. Firstly, it is comparatively costly to generate compressed air by compressors, since these have a comparatively high energy consumption per unit of time. Secondly, the power, i.e. in practice the size, of the compressor needed so as to provide a certain impact mechanism with compressed air depends on the compressed air consumption per unit of time required for the proper operation of this impact mechanism. This means in its turn that an unnecessarily high consumption of compressed air implies the use of compressors having an unnecessarily high power and which accordingly are more expensive as well as heavier, and by that more difficult to move, than the compressors having a lower power.
SUMMARY OF THE INVENTION
The object of the present invention is to provide an impact mechanism of the type mentioned in the introduction, which finds a remedy to the inconveniences mentioned above of such impact mechanisms already known by having a considerably lower consumption of pressure medium than those which do not in any way waive the operation ability or reduce the working power obtained by the working member of the impact mechanism.
This object is in accordance with the invention obtained by providing an impact mechanism of the type mentioned in the introduction with means adapted to be actuated, i.e. influenced, by the relatives movement of the working member and the stop member and by this actuation during the separation movement of these members arrive to a state in which they obstruct the opening and interrupt the feed of pressure medium to the working chamber and during the movement of these members towards each other leave this state and allow pressure medium to be fed to the working chamber through the opening.
Thanks to the existence of said means in the impact mechanism according to the invention, whereby the supply of pressure medium to the working chamber is interrupted during the separation movement of the working member and the stop member and is established again during the movement of these members towards each other, the consumption of pressure medium of the impact mechanism m
REFERENCES:
patent: 2580158 (1951-12-01), Dean
patent: 3273657 (1966-09-01), Williams et al.
patent: 3367428 (1968-02-01), Conrad
patent: 3802516 (1974-04-01), Speicher
patent: 4605073 (1986-08-01), Nilsson et al.
patent: 4903784 (1990-02-01), Glaser
Berg Roland
Edstrom Kjell
Nilsson Goran
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