Differential thread control of chuck gripping of work
OwnerFrank J. Brianinventor
Life of this patent
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Abstract
An apparatus for adjusting the grip of a tubular chuck upon work, the chuck receivable in a bore formed by a holder, and comprising a rotatable connector member having first and second thread connections for exerting force transmitted to the chuck; the head connections characterized as differential, whereby as the member is rotated, the chuck closes toward the work, with high mechanical advantage; the chuck defining a first axis; the connector member defining a second axis generally transverse to the first axis, the axes being non-interconnecting.
Claims12
Apparatus for adjusting the grip of a rotary tubular chuck upon work, the chuck receivable by a rotating holder, comprising in combination with said chuck:
- a) a rotatable connector member having first and second thread connections for exerting force transmitted to the chuck,
- b) said thread connections characterized as differential, whereby as said member is rotated, the chuck closes toward the work, with high mechanical advantage,
- c) said chuck defining a first axis of rotation,
- d) said connector member defining a second axis generally transverse to the first axis, said axes being non-interconnecting,
- e) said chuck having at least one slit therein which reduces in width as the chuck is urged toward the work, said connector member intersecting said slit,
- f) there being differential thread connections formed in the chuck at axially opposite sides of the slit, to interengage the connector differential thread connections,
- g) said differential threads configured to produce a net closing rate of said slit of no more than 0.00315 inches per turn of the connector member.
Apparatus for adjusting the grip of a rotary tubular chuck upon work, the chuck receivable by a rotating holder, comprising in combination with said chuck:
- a) a rotatable connector member having first and second thread connections for exerting force transmitted to the chuck,
- b) said thread connections characterized as differential, whereby as said member is rotated, the chuck closes toward the work, with high mechanical advantage,
- c) said chuck defining a first axis of rotation,
- d) said connector member defining a second axis generally transverse to the first axis, said axes being non-interconnecting,
- e) said chuck having at least one slit therein which reduices in width as the chuck is urged toward the work, said connector member intersecting said slit,
- f) one differential thread connection on the connector interfitting a corresponding thread on the chuck, at one side of the slit;
- and the other differential thread connector on the connector interfitting a corresponding thread on an insert in the chuck, and having separate threaded interengagement with the chuck,
- g) said differential threads on the connector member and on the chuck, and on the connector member and on the insert, being configured to produce a net closing rate of said slit of no more than 0.00315 inches per turn of the connector member.
Dependencies are inferred from the claim text.