Tools – Tool jaw – Jaw-actuating means
Patent
1988-05-16
1990-05-08
Schmidt, Frederick R.
Tools
Tool jaw
Jaw-actuating means
81358, 81325, B25B 712
Patent
active
049227700
ABSTRACT:
A self-locking pliers provides automatic jaw adjustment for gripping objects of different sizes. First and second pinsers-defining members each have a body portion, a jaw-defining portion and a handle portion, being joined by a bolt extending through a slot in one of the members in pivotal, mutually moveable relationship. The slot permits pivoting as well as sliding movement of the first member relative to the second member, and has along a jaw-proximate side teeth to be engaged by corresponding teeth of a locking pawl carried rotatably within the slot by a shank of the bolt. A jaw-remote side of the slotted opening provides a smooth surface for sliding engagement of a smooth reaction surface of the locking pawl opposite from its teeth. The locking pawl has on its jaw-proximate side a camming surface proximate to the locking teeth. A control arm is pivotally engaged at one end to the body portion of the second member. The body portion of the first member receives the other end of the control arm in slidably captive relationship, while a spring carried by the second member resiliently biases the control arm for movement about its pivoted end toward the jaws. The control arm initially causes the locking pawl reaction surface to bear against the jaw-remote side of the slot, so that squeezing the handles causes jaw-closing movement of the jaws until they close upon an object until contacted by the jaws. Such jaw contact the jaws causes the pawl to rotate within the slot for forcing its teeth into locking engagement with the rack for maintaining the jaws in locked, object-contacting relationship while handle pressure is maintained by the user. An interference-providing arrangement including a detent for the control arm provides controlled pawl engagement of the toothed rack and avoids "hanging up" the pawl or its inadvertent engagement.
REFERENCES:
patent: 2531285 (1950-11-01), Manspeaker
patent: 4662252 (1987-05-01), Warheit
Dlugolecki Andrzej J.
Herman Timm R.
American Pneumatic Technologies, Inc.
Cruz Lawrence
Schmidt Frederick R.
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