Title: Cam mounting for an impact tool

Abstract: A motor driven cam and spring impact tool with an improved mounting for the cam. The impact tool includes a driving shaft for rotation relative to the housing. A hammer is positioned in the housing for axial movement with respect to the housing. An annular cam with cam rollers translates the rotational motion of the hammer. A spring urges the hammer in one direction to cause an impact upon each reciprocation. A collar, driven by the shaft, is connected to the cam for rotating it with respect to the rollers. A pair of pins are connected between the cam and the collar for driving the cam. The holes in the cam receiving the pins are enlarged in the direction of rotation to allow the cam to move a selected distance with respect to the pins. This creates backlash at the drop off points on the camming surface.

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Inventors: Whitworth, Billie J. (Pasadena, TX, US)

Application Number: 759503
Filing Date: 1977-01-14
Publication_date: 1978-04-04
Assignee: Hughes Tool Company (Houston, TX)
Primary Class(es): 173/203 172/123
Other Classes:
US Patent Ref:

3302732	Feb, 1967	Roll	173/DIG.
3322208	May, 1967	Skoog	173/123.
3374685	Mar, 1968	Eheim	74/56.
3774700	Nov, 1973	Shepherd	173/123.

Other Refs:
Primary Examiner: Hafer, Robert A.
Assistant Examiner:
Attorney: Felsman; Robert A.