Tool driving or impacting – Including means to vibrationally isolate a drive means from... – Handle type holder
Patent
1996-12-06
1998-05-12
Smith, Scott A.
Tool driving or impacting
Including means to vibrationally isolate a drive means from...
Handle type holder
173128, 173169, 173170, B25D 1704
Patent
active
057494215
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a pneumatic impact breaker of the type comprising a housing which at its rear end is provided with one or two handles and which is formed with a longitudinal cylinder bore, a hammer piston reciprocably guided in the cylinder bore, a front portion of the housing which includes a socket means for receiving the rear impact receiving end of a working implement, an air distributing valve located in the rear part of the cylinder bore and arranged to direct motive pressure air alternatingly to the opposite ends of the hammer pistons to make the latter reciprocate in the cylinder bore, and a rear cylinder head forming a closure of the cylinder bore as well as an axial support for the air distributing valve.
BACKGROUND OF THE INVENTION
Pneumatic impact breakers of the above type provide an effective breaking by a high impact energy but generate at the same time external vibrations and internal blows which have a detrimental influence on the operator as well as on the mechanical parts. By using vibration damped handles it has been aimed to improve safety conditions for the operator, and at the same time the breaker itself has to have a very rugged design to withstand the risk of damage at operation. This normally means an increased weight of the breaker as a result of heavy steel components and also a need for strong side bolts or space demanding screw joints to keep the parts together. Examples thereof are shown in the following patent publications: U.S. Pat. Nos. 3,446,294, 4,303,133, and U.S. Pat. No. 4,673,042. The latter two patents also disclose an exchange of steel components for parts of a plastic material so as to bring down the total weight of the breaker, and reduce vibrations and noise. Also, in British patent GB 2,018,904 it is understood that conventional screw joints are used to keep the parts together, and a specific valve arrangement is disclosed.
OBJECT OF THE INVENTION
The object of the invention is to redesign the rear part of pneumatic breaker such that heavy side bolts and screw joints are eliminated, the weight and size of the cylinder head is substantially reduced, more components of plastic material are used for keeping down the weight and manufacturing costs, and ergonomically improved vibration damped handles are fitted to the rear part of the machine. These purposes are achieved by the invention as it is recited in the following claims.
BRIEF DESCRIPTION OF THE DRAWINGS
Preferred embodiments of the invention are described below with reference to the accompanying drawings.
In the drawings,
FIG. 1A and 1B show longitudinal sections, divided by a transverse line A-B, through the pneumatic breaker according to the invention.
FIG. 2 shows on a larger scale a longitudinal section of the rear part of the breaker according to FIG. 1A.
FIG. 3 shows a section on a somewhat smaller scale along line 3--3 i FIG. 2.
FIG. 4 shows on a larger scale a fractional view of FIG. 3.
FIG. 5 shows a detail view similar to FIG. 4, but illustrates an alternative embodiment.
FIG. 6 shows a view similar to FIG. 3, but illustrates an alternative handle design.
DETAILED DESCRIPTION
The impact breaker 10 shown in FIGS. 1A, 1B comprises an elongate housing 11 with a cylinder bore 20 and provided with a cylinder head 12, handles 18, 19, and a front portion 13. These parts are interconnected and symmetrically oriented relative to the longitudinal axis 24 of the cylinder bore 20. The cylinder bore 20 is extended rearwardly from an annular shoulder 21 through an enlarged bore 23. The cylinder bore 20 is also extended forwardly from an inner annular shoulder 25 through a forward bore 45. In front of the bore 45 the housing 11 is formed with a clamping portion 46 including an axial slot 47. The clamping portion 46 defines a further enlarged bore 48 which extends coaxially with the bore 45 and the cylinder bore 20.
In the bore 45 there is received a sleeve shaped intermediate member 17 which has an outer shoulder for abutting cooperation with the annular shoulder 25 and which extends seali
REFERENCES:
patent: 2926637 (1960-03-01), Spurlin
patent: 2984210 (1961-05-01), Fuehrer
patent: 3275089 (1966-09-01), Kaiser et al.
patent: 3939925 (1976-02-01), Danielson
patent: 4576241 (1986-03-01), Emonet
patent: 4718502 (1988-01-01), Garcez
patent: 5273120 (1993-12-01), Chang
patent: 5524715 (1996-06-01), Kimberlin et al.
Johansson Ingemar Sven
Nilsson Ake Lennart
Atlas Copco Berema AB
Smith Scott A.
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