Tool driving or impacting – Means to drive tool about an axis – Means to hold and relatively rotate sections of tool shaft
Patent
1976-08-12
1978-01-10
Hafer, Robert A.
Tool driving or impacting
Means to drive tool about an axis
Means to hold and relatively rotate sections of tool shaft
279 30, 279 75, 24136A, H01B 1716
Patent
active
040674037
ABSTRACT:
Chuck for a gear reduction surgical rotary driver. There is provided for a controlled speed surgical driver an automatically releasable chuck for grasping tools of a very small diameter such as the wire used in bone pinning. In a driver having a conventional high-speed drive motor and speed reduction means, there is provided a frustro conical ramp, of generally circular cross section, and diverging outwardly toward the working end of the tool. A wire carrier is arranged for longitudinal sliding movement in the end of said tool and having a portion thereof projecting beyond said tool. Said wire carrier receives the wire centrally therethrough and carries three gripping devices which act between the wire and said ramp. Two of said gripping devices are preferably of ball shape and the third thereof is of generally disk shape with a rounded periphery whereby to project between said balls and engage a wire or other tool of small diameter. Resilient means push said carrier against said ramp and same is manually retractable therefrom. Thus, by manually retracting the carrier, the wire may be inserted, will be normally held firmly in place by said balls and disk and may be again removed by manually retracting said carrier against said resilient means.
REFERENCES:
patent: 1026567 (1912-05-01), Delihanty
patent: 1056076 (1913-03-01), Wiard
patent: 2959422 (1960-11-01), Manos
patent: 3398965 (1968-08-01), Cox
patent: 3674281 (1972-07-01), Hedrick
patent: 3718340 (1973-02-01), Stewart
patent: 3975032 (1976-08-01), Bent et al.
Eaton Russell K.
Richmond James W.
Hafer Robert A.
Stryker Corporation
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