Handle frame for percussive hand held machines

Tool driving or impacting – Including means to vibrationally isolate a drive means from... – Handle type holder

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Details

173170, B25D 1704

Patent

active

061128317

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a handle frame for percussive hand held machines of the type comprising a machine housing with a hammer mechanism therein adapted to repeatedly impact against a working tool projecting out from said machine housing, such a handle frame is connected to the machine housing through the medium of a vibration damper, has handgrips that project outwardly, and is adapted for vibration suppressed feeding by hand of said machine housing in the longitudinal direction of said working tool.


BACKGROUND OF THE INVENTION

As typical examples of such handle frames there can be referred to patent publications U.S. Pat. No. 3,451,492 (SE 226 416) and EP 0 104 154. The handle frames disclose therein fulfill an acceptably adapted function substantially only at the feed proper however, while moving to a new place or a new point of tool application, due to the imbalanced weight distribution of the machine in relation to the handle frame, the machine housing has to be touched directly for purposes of shifting the position upward or to the side. This demands contacting parts of the machine that are unsuited for being touched i.e. vibrating parts and parts that due to operation have turned hot or become dirty. That is inconvenient and tiring for the operator and involves risk for injuries. In particular in combustion engine driven percussive machines there is produced heat that radiates out both from the motor and the hammer mechanism. The weight-saving compact build-up of hand held machines normally leads to that the fuel tank is placed near the motor, conventionally often with the tank made of a plastic material, and that involves the risk of the tank swelling, the danger of spill against hot parts from cracked tanks and during fueling, and disturbances by fuel pressed out into the fuel system or the environment when the tank becomes overheated.


OBJECT OF THE INVENTION

An object of the invention, in handle means of the above-mentioned type, is to create an outer handle frame through which handling and directing of the machine will be effectively improved. As a benefit is attained, that all necessary actuating points during normal working operations around the machine housing become vibration suppressed while direct contact with the machine during any form of handling is obviated, whereby shifting of the working positions can be performed conveniently, without risk, and with increased safety for the operator. At the same time the inventive handle frame, due to its spacing in assembled state relative to the machine and in particular in cases when the hammer mechanism's drive is a combustion motor, is well suited to be formed as a tight highly strong tubular fuel tank for the motor, which increases the safety against heating of the fuel and fire set to spilled fuel. The overpressure in such case can be locked safely within the tank without risk for formation of cracks, so that fuel spill to the environment and overflooding of the motor interior from the tank via the carburetor is avoided. In a robust normal embodiment, the handle frame furthermore functions as an impact absorbing protection if the machine happens to fall from upright working position or is carelessly treated during transportation. The objects accounted for above are attained by the characterizing features of the claims following hereinafter.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows an embodiment represented by a hand held percussive machine, i.e. a breaker machine, viewed from the rear, i.e. from the side of the machine from which the operator controls the machine by the handle frame comprised in the handle means according to the invention. The protective casing is partly sectioned open for showing, in principle schematically, underlying parts.
FIG. 2 shows the handle frame in FIG. 1 alone, removed from the breaker.
FIG. 3 shows a top view of the handle frame and indicates by broken lines an alternative embodiment.
FIG. 4 shows a side view of the handle frame in the alternative embodiment of FIG. 3 and with a laterally

REFERENCES:
patent: 2430817 (1947-11-01), Jackson
patent: 3451492 (1969-06-01), Ekstrom et al.
patent: 3990523 (1976-11-01), Schramm et al.
patent: 4282938 (1981-08-01), Minamidate
patent: 4912848 (1990-04-01), Bidanset
patent: 5285858 (1994-02-01), Okada et al.
patent: 5462127 (1995-10-01), Svensson

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