Tool driving or impacting – Including means to vibrationally isolate a drive means from... – Handle type holder
Patent
1993-08-12
1995-03-28
Smith, Scott A.
Tool driving or impacting
Including means to vibrationally isolate a drive means from...
Handle type holder
2671413, B25D 1700
Patent
active
054008603
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates generally to an apparatus for reducing vibration transmission in a hand-held tool and more particularly relates to apparatus for reducing vibration transmission from a working portion of a hand-held tool to the user of the tool.
Previous attempts to reduce hand/arm vibration in a percussive tool have generally centered around either the isolation of the operator's grip by means of sprung handles or by employing a means of curing power to the tool as the operator force increases.
One limitation of the springs-solution is that a damper is required as well as the spring in order to obtain the optimum effect. Also, the mass of the sprung handles is relatively small compared with the mass of the tool and, since a coil spring usually functions linearly, high deflections are experienced. As a result, the option to reduce the power to help achieve the desired effect has been investigated. Power regulation of the tool has obvious disadvantages to efficiency, in that it reduces the blow frequency and intensity.
The foregoing illustrates limitations known to exist in percussive tools. Thus, it is apparent that it would be advantageous to provide an alternative directed to overcoming one or more of the limitations set forth above. Accordingly, a suitable alternative is provided including features more fully disclosed hereinafter.
SUMMARY OF THE INVENTION
In one aspect of the present invention, there is provided an apparatus for reducing vibration transmission from a working tool portion of a hand-held tool to the user of the tool, the apparatus comprising a floating, resilient ball arrangement interposed between a handle portion of the tool and the working portion of the tool and second means for reducing vibration transmission from the working tool portion to a casing of the tool, said second means being located adjacent the working tool portion and between the casing and the working tool portion.
The tool may be a percussive tool, such as a chipper, digger, needle gun, scaler, hammer drill or a demolition tool.
The tool may be air operated. The tool could also be electrically operated.
Preferably, the resilient bah arrangement of the first means comprises balls, preferably three, which can be of rubber, located between a male part on one of the portions and a female part on the other of the portions.
The male part can be a substantially frustoconical part joined to the handle portion and the female pan can be a female bed joined to the working portion of the tool or vice versa, the bed facing the frustoconical portion with the balls lying compressed on the bed and the external surface of the frustocone.
Oscillatory movement of the female bed parallel to the longitudinal axis of the frustocone causes the balls to roll on the male and female surfaces.
The balls can be located by pins or the like.
In the case of an air-operated tool, at least one and preferably each ball may be provided with a bore through which air under pressure can be transmitted from the frustoconical portion to the female bed and then to the action of the working part of the tool.
According to another aspect of the present invention, there is provided an apparatus for reducing vibration transmission from a working portion of a hand-held tool to a casing of the tool, the apparatus including a floating, resilient ball arrangement interposed between the casing and the working portion of the tool.
This resilient ball arrangement of the second means can be in the form of a set of balls in a ring around the internal periphery of the casing and around the outer periphery of part of the working portion of the tool, thereby separating and isolating the two portions.
The set of balls can be linked together.
The balls can be located within shells which are curved to urge the balls towards their mean positions.
The foregoing and other aspects will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawing figures.
BRIEF DESCRIPTI
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patent: 4936394 (1990-06-01), Ohtsa
patent: 5095600 (1992-03-01), Allan
Best Anthony
Neads Stephen J.
Ingersoll-Rand Company
Smith Scott A.
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