Tool driving or impacting – Impacting devices – With impact cushioning means
Patent
1998-04-10
1999-09-07
Smith, Scott A.
Tool driving or impacting
Impacting devices
With impact cushioning means
1731621, 1731622, B25D 1704, B25F 502
Patent
active
059472111
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to vibration-damped machine driven tools of the kind that include a machine housing, a drive mechanism which is housed in the machine housing and which functions to drive a working tool projecting out from the housing, and a carrier in which the generation of vibrations by the drive mechanism and the tool at work is undesirable and which supports the machine housing through the medium of a vibration damper and by means of which an appropriately directed tool feeding force is brought to bear on the machine housing and the tool such as to cause the tool to carry out work.
BACKGROUND OF THE INVENTION
Machines such as mechanical breakers, drills, and mechanical tampers are examples of percussion tools whose vibrations, if they are not damped, are liable to reach levels that are harmful to the operator or to the supporting machinery. Vibration related problems also exist with other types of machines, for instance with heavy rotary drilling machines, motor saws, brush saws and shearing machines based on rotary or reciprocatory tool movement. Various vibration damping means have been proposed in an endeavour to overcome these problems. However, progressively sharpened standard requirements have meant that the solutions hitherto proposed in this regard fail to ensure that the tool or machine is sufficiently friendly to both workman and machinery.
Various types of spring devices have been used to dampen vibrations, including pneumatic devices, with subsequent undesirable air losses when damping vibrations, and more general elastic materials and steel springs. As an example of these two latter applications in hand-held percussion tools with different drive systems, reference can be made to Patent Specifications 1) EP/SE 0 104 154, 2) SE 226 416 and 3) U.S. Pat. No. 4,111,269. According to Patent Specification 1), handle vibrations are dampened with the aid of a rubber diaphragm. This damping effect is impaired, however, by rotary vibration and frictional forces generated between the outer surface of the machine and the front part thereof. Patent Specification 2) teaches a vibration damping solution which employs the use of a built-in helical spring. However, this solution is also encumbered with disturbing vibration-transmitting friction in the guides. Patent Specification 3) discloses non-linear leaf-spring damping, which is restricted to the furthest rearward handgrip, while balanced handling of the front part of the machine must be achieved in the absence of vibration damping.
OBJECT OF THE INVENTION
The object of the present invention is to provide a vibration-damped machine driven tool of the afore-described kind with which vibration damping is greatly improved and with which leaf springs are used to dampen vibration in all directions and also to support the tool during a working operation without being affected by friction. A further object is to make possible, in a non-lubricated and wear-free manner, purely linear damping of vibrations with positive transverse stability when aligning the machine in a working operation. This obviates at the same time the need to use rubber vibration damping material, whose damping effect is negatively effected by the internal development of heat, cold and moisture. These objects are achieved with a vibration dampened tool having the features set forth in the appended claims.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described with reference to the five figures of the accompanying drawings, in which
FIG. 1 illustrates an embodiment of the invention applied to a hand-held machine, a breaker, and shows the machine in an inactive state from the rear, i.e. that side from which the operator controls the machine. The protective casing of the machine has been partly cut away, to illustrate schematically the inner machine components more clearly;
FIG. 2 is a sectional view taken on the line 2--2 in FIG. 1 and shows the contemplated tool contour above said section in chain lines;
FIG. 3 is an enlarged partial sectioned view taken
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patent: 4673043 (1987-06-01), Greppmair
patent: 4800965 (1989-01-01), Keller
patent: 5025870 (1991-06-01), Gantner
patent: 5522466 (1996-06-01), Harada et al.
patent: 5769174 (1998-06-01), Lee et al.
Atlas Copco Berema Aktiebolag
Smith Scott A.
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