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US 3,960,039 AGranted
Collet wrench
AssigneeStar Dental Manufacturing Co., Inc.
InventorsJohn E. Nash, Trevor D. Reader
Life of this patent
Estimating the term…
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AssigneeStar Dental Manufacturing Co., Inc.
InventorsJohn E. Nash, Trevor D. Reader
Estimating the term…
A collet wrench adapted to place a predetermined force on a collet threadedly secured in a dental handpiece. The wrench comprises a frame and means on the frame for securing the rotor shaft against rotation. A shaft is rotably mounted in the frame, and has a lower end of non-circular cross-section. The lower end is received in the collet and is adapted to rotate the collet relative to the rotor shaft. A disc having ratchet teeth is keyed to the shaft and a second disc having ratchet teeth is placed on the first mentioned disc and held there by a spring force. Rotation of the second disc causes the rotation of the first disc, and the subsequent rotation of the shaft having the end secured to the collet. After a predetermined force has been applied to the second disc, it will slip relative to the first disc, and accordingly apply a predetermined force to the collet. The pressure of the spring controls the predetermined force.
A wrench adapted to be hand-held comprising a shaft, said shaft having one end configured to be received in a threaded, rotatable securing device, said end being adapted to cause the rotating of said securing device when said end is rotated, the other end of said shaft having a first disc secured thereto, said first disc having teeth formed in the upper surface thereof, a second disc overlying said first disc, and being rotatable relative to said shaft, said second disc having teeth which are complementary with the teeth in said first disc on the under surface thereof, spring means urging said second disc into contact with said first disc, and means for rotating said second disc, said rotating means comprising a cylinder, said cylinder having a plurality of legs projecting downwardly therefrom, said legs being engaged in slots in said second disc, said spring means having a force sufficient to cause the rotation of said first disc when said second disc is rotated, and said spring means permitting rotation of said second disc relative to said first disc when a predetermined rotational force has been applied to said securing device.
A wrench adapted to be hand-held comprising a frame, said frame having means thereon for preventing rotation of a rotatable member, a shaft rotatably secured in said frame, said shaft having one end configured to be received in a threaded rotatable securing device, said securing device being threadedly secured on said rotatable member, said end being adapted to cause the rotation of said securing device when said end is rotated, the other end of said shaft having a first disc secured thereto, a second disc overlying said first disc, and being rotatable relative to said shaft, said second disc being urged into contact with said first disc by spring means, means on the abutting surfaces of said discs to cause the interlocking of said discs whereby the rotation of the second disc will cause the rotation of said first disc, and means for rotating said second disc, said rotating means comprising a cylinder, said cylinder having a plurality of legs projecting downwardly therefrom, said legs being engaged in slots in said second disc, said spring means having a force sufficient to cause the rotation of said first disc when said second disc is rotated, and said spring means permitting rotation of said second disc when a predetermined rotational force has been applied to said securing device.
Dependencies are inferred from the claim text.