Tool driving or impacting – Drive controlled by relative axial movement of tool
Patent
1978-10-10
1982-03-09
Mackey, Robert
Tool driving or impacting
Drive controlled by relative axial movement of tool
173119, 173 23, 173DIG3, 74 55, B25D 1110
Patent
active
043184464
ABSTRACT:
A linear motion impactor device includes an impactor (28) which provides force to a hammer shank (56) only upon application of the hammer against a surface to be impacted thereby saving power and reducing noise during periods of non-use. The impactor (28) which operates on the hammer shank (56) is mounted in a housing (12) and is formed with a bore (30) normally coincident with the axis of rotation (22) of an eccentric cam (24) which is rotated by a power source (20). The impactor (28) is retained in this center-line position by a compression pad (38) positioned between the impactor (28) and the housing (12) and further positioned diametrically opposite the hammer shank (56). In the two embodiments described, either linear bearings (76, 78) or shear pads (42, 44) ensure linear motion to the impactor (28) during operation.
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Caterpillar Tractor Co.
Mackey Robert
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