Tool driving or impacting – Impacting devices – Hammer head moves in arcuate path or rotates
Patent
1987-05-08
1989-09-19
Yost, Frank T.
Tool driving or impacting
Impacting devices
Hammer head moves in arcuate path or rotates
173101, 74 55, 74569, B25D 1100
Patent
active
048672513
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to improvements in impact devices and particularly although not exclusively to 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.
Previously known impacting devices such as needle guns scalers, chippers and the like have hitherto suffered a number of serious disadvantages. Prior art devices have been either large, cumbersome and heavy to operate, they suffered from considerable vibration, they were subject to inordinately rapid wear, or most usually they suffered from combinations of the above problems. Such prior art devices are exemplified in U.S. Pat. No. 3193908, Australian Pat. No. 154157, French Pat. No. 874708 and German Pat. Nos. 442532, 463948.
In an endeavour to overcome or at least alleviate the problems of prior art impact devices there has been proposed a device employing a plurality of enertia members in the form of steel balls movable in radially bored recesses in a rotatable member. This is described in my European Patent Specification No. 0 058 677.
The present invention is concerned with yet a further improved impact tool in the form of a needle gun, chipper, scaler or the like. It should be understood however that the broad principle underlying the present invention is equally applicable to other impact tools such as hammers, drills, chisels and the like.
According to the invention there is provided an impact tool comprising:
a housing having a hollow cylindrical aperture therein;
a rotatable member located within said housing, said rotatable member being rotatable about central axis coaxial with said cylindrical aperture, said rotatable member including a plurality of retaining elements radially spaced from said central axis;
a plurality of energy transfer members captively associated with respective said retaining elements, said energy transfer members being substantially annular in shape; 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 members.
The rotatable member suitably comprises a plurality of elongate retaining members extending parallel to said central axis and said retaining members are radially spaced from said central axis at substantially equal radii. Preferably said retaining members are spaced circumferentially substantially equally.
The annular energy transfer members may be captively associated with the rotatable member by a retaining element located within a central aperture of each annular energy transfer member. Suitably the retaining element is circular in cross section and preferably the diameters of retaining elements are less than the diameters of the central apertures of the energy transfer members.
Preferably said rotatable member includes means to locate arrays of energy transfer members at two or more axially spaced locations in the same radial plane. Each said array may comprise one or more energy transfer means.
Suitably each axially spaced array may comprise a single energy transfer member and each said energy transfer member may be arranged in successive axially spaced locations to form a helical configuration of energy transfer members.
Alternatively each axially spaced array may comprise two or more energy transfer members located circumferentially equidistant.
The apparatus according to the invention includes drive means and m
REFERENCES:
patent: 1464570 (1923-08-01), Hage
patent: 1707887 (1929-04-01), Wagner
patent: 2136595 (1938-11-01), Rogers
patent: 2233913 (1941-03-01), Colestock
patent: 2263595 (1941-11-01), Sinkko
patent: 3193908 (1965-07-01), White
patent: 4593767 (1986-06-01), Isenring
Kango Limited
Wolfe James L.
Yost Frank T.
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