Elongated-member-driving apparatus – With means to support member and/or work relative to driver – Impact-type driver
Patent
1988-08-05
1989-10-24
Bell, Paul A.
Elongated-member-driving apparatus
With means to support member and/or work relative to driver
Impact-type driver
74110, 173 90, B25L 700
Patent
active
048756121
ABSTRACT:
An improved impact apparatus of the type in which an impact member delivers an impact to a work piece, an elongated guide confines the motion of the impact member to within a predetermined path, an input handle receives the input movement, and a speed multiplying mechanism transmits the input movement to the impact member. The input movement is received as an input force along an input axis causing the input handle to move at an input velocity. This input is transformed by the speed multiplying mechanism into an output force along an output axis, causing the impact member to move at an output velocity which is faster than the input velocity. For apparatus in which the speed multiplying mechanisms are not axially symmetric, thus having output axis laterally displaced from the input axis, the present invention provides improved positioning of the input and output axes along lines that pass near the center of gravity of the impact member, thus minimizing the unwanted torque on the moving parts. By reducing the unwanted torque on the moving parts, friction and the risk of binding are reduced. The use of these improvements enables the apparatus to be made of less-costly materials and be constructed with less precision.
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