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Automatic jaw control for reversible power tool

  • US 4,526,497 A
  • Filed: 03/15/1982
  • Issued: 07/02/1985
  • Est. Priority Date: 03/15/1982
  • Status: Expired due to Fees
First Claim
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1. In a reversible drill having a rotary drive shaft carried by a drill housing and having a chuck engageable for rotation with said drive shaft and formed with a jaw guide, chuck jaws constrained by said jaw guide for radial advancement and retraction relative to the axis of said drive shaft, chuck jaw reciprocating means journaled relative to said jaw guide, and coupled to said chuck jaws to selectively advance and retract said chuck jaws when said chuck jaw reciprocating means and said jaw guide are subjected to relative rotation in opposite directions, and manually actuatable clutch means for engaging and disengaging said chuck jaw reciprocating means relative to said drill housing to respectively prevent and allow relative rotation between said jaw guide and said chuck jaw reciprocating means, the improvement wherein said clutch means includes a clutch actuator mounted for movement relative to said drill housing, and including a bearing collar disposed coaxially about said drive shaft and riding on a spiral track secured relative to said drill housing and a radial lever arm operated from externally of said drill housing and connected to said bearing collar, clutch interface means for engaging said drill housing to said chuck jaw reciprocating means and including first and second sets of opposing teeth disposed about a common axis and about said drive shaft in facing relationship, longitudinally reciprocal means for bringing said first and second sets of teeth into and out of engagement, means for immobilizing said first set of teeth from rotation relative to said drill housing, means coupling said second set of teeth to rotate with said chuck jaw reciprocating means, biasing means urging said first and second sets of teeth apart and urging said first set of teeth to drive bearing collar toward one end of said spiral track, coupling means for moving said clutch interface means into engagement at a mechanical advantage in response to movement of said clutch actuator, wherein said lever means is coupled to said bearing collar and operable from externally of said drill housing to totate said bearing collar and overcome said biasing means to advance said bearing collar toward the opposite end of said spiral track, thereby forcing said first and second sets of teeth into mutual interengagement.

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