Tool driving or impacting – Impacting devices – Hammer head moves in arcuate path or rotates
Patent
1984-09-20
1986-06-10
Kazenske, E. R.
Tool driving or impacting
Impacting devices
Hammer head moves in arcuate path or rotates
29 81D, B25D 1100
Patent
active
045937672
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to improvements in impact devices and particularly although not exclusively to impact hammers and like devices such as needle guns.
Needle guns generally comprise a number of hardened steel rods or "needles", tapered at one end and retainably mounted in a housing with the tapered or pointed ends extending outwardly. The retained ends of the needles are subjected to a "hammering" action generally by a rotating hammer or anvil device.
Needle guns and impact chisels may be used for a variety of purposes including removal of rust, dirt, paint or other coatings from surfaces prior to painting or other treatment. In addition, welding slag is readily removable from welded surfaces by the use of a needle gun or impact chisel. Needle guns have been found to be particularly suitable for roughening the surface of cured concrete where reconcreting is required.
Prior art impacting devices such as needle guns, impact hammers and impact chisels have generally suffered the disadvantages of being heavy and cumbersome in size and in operation, subject to considerable vibration. In addition, prior art impact devices have not been particularly efficient in their operation, especially when operating on uneven surfaces.
SUMMARY OF THE INVENTION
The impact device of the present invention aims to alleviate the disadvantages of prior art impact devices and provide an improved impact device of reduced weight and bulk, greater ease of operation through reduced vibration and more efficient operation.
According to the invention there is provided an impact device comprising:
a body adapted to house a rotatable member;
a rotatable member located within said body, said rotatable member including one or more apertures adapted to receivably locate energy transfer means;
one or more energy transfer means movably located within said one or more apertures; and,
impact means associated with said body, whereby in use, rotation of said rotatable member causes energy to be imparted to said impact means by said energy transfer means.
Preferably said body comprises a hollow essentially cylindrical aperture defining an inner wall surface. Suitably at least a portion of said inner wall surface is outwardly divergent adjacent the impact means to enhance energy transfer between said energy transfer means and said impact means. More suitably, the body comprises means to eccentrically locate the rotatable member for rotation therewithin. Most suitably, the rotatable member is located within said body for rotation about an axis essentially parallel to and spaced from a central axis of said body.
Preferably the rotatable member comprises one or more apertures extending inwardly of an outer peripheral surface thereof. Suitably the rotatable member comprises a plurality of apertures extending substantially radially inwardly of said outer peripheral surface.
Preferably the energy transfer means is adapted in use to be urged toward the impact means to impact energy thereto. Suitably the energy transfer means is urged toward the impact means under the influence of centrifugal force. Most suitably the energy transfer means is adapted in use to engage the inner wall of the body for rolling engagement therewith.
Preferably the impact means includes support means for one or more impact tools, said support means being associated with the body to retainably locate said one or more impact tools for cooperation in use with said energy transfer means.
Suitably the support means comprises guide means for retaining said one or more impact tools in desired alignment relative to said body.
BRIEF DESCRIPTION OF THE DRAWINGS
Certain embodiments of the invention will now be described with reference to the accompanying drawings in which:
FIG. 1 illustrates an exploded view of a needle gun constructed according to the invention;
FIG. 2 illustrates an end elevation of the needle gun of FIG. 1;
FIG. 3 illustrates a side elevation of the apparatus of FIG. 2;
FIG. 4 illustrates a sectional side elevation of the apparat
REFERENCES:
patent: 1464570 (1923-08-01), Hage
patent: 1580202 (1926-04-01), Jaffrennou
patent: 1707887 (1929-04-01), Wagner
patent: 1725212 (1929-08-01), Schneider
patent: 1824935 (1931-09-01), Thompson
patent: 2019931 (1935-11-01), Rasch
patent: 2233913 (1941-04-01), Colestock
patent: 2248523 (1941-07-01), Francastel
patent: 3680643 (1972-08-01), Cameron et al.
Kazenske E. R.
Wolfe James L.
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