US3558146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Keyless chuck
Assignee: Individual
•
Filing: 1968-04-02
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Granted: 1971-01-26
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Expires: 1988-04-02
Abstract
Abstract A keyless chuck assembly, wherein the chuck grips the tool shank solely as a result of the torque produced by the resistance of the workpiece to the turning movement of the chuck. In a first embodiment, the gripping members are preferably shaped in the form of a wedge which is laterally displaced by the torque against one side of the slot and simultaneously cammed into permanent gripping engagement with the cylindrical surface of the tool shank, the side of the slot serving as a stop for limiting the gripping pressure between the shank and the wedge. In a second embodiment, the gripping members are preferably shaped in the form of a triangle, the sides of which terminate opposite the base in a pair of opposed gripping ears. Either a clockwise or counterclockwise torque will laterally displace the second gripping member against one of the sides of the slot and simultaneously cam one of the gripping ears into permanent gripping engagement with the cylindrical surface of the tool shank. Each side of the slot serves as a stop for limiting the gripping pressure between the shank and the associated gripping ear of the triangular gripping member.
Inventors
- 👤 Dale Martin Mayers
- 👤 Duane D Cook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:23
CPC Classifications
B; B23; B23B; B23B31/00; B23B31/02; B23B31/10; B23B31/12; B23B31/1207; B23B31/1215; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17128; Y10T279/17171; Y10T279/17179; Y10T279/19; Y10T279/1986
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
357 words
In a keyless chuck assembly having a plurality of gripping means located at equal angular distances from each other about a common axis and adapted to grip a tool shank inserted therein along said axis, the improvement therein which comprises: each of said gripping means including a jaw simultaneously movable both longitudinally and transversely of said common axis, axis; said jaw having an open slot extending longitudinally of its inner edge parallel to said common axis; a gripping member mounted in said open slot for free movement laterally of said common axis adapted to engage and permanently grip said tool shank solely as a result of being laterally displaced by the torque produced by the resistance of a workpiece to the turning movement of the tool shank; said gripping member is formed in the general shape of an elongated triangle, said triangle including: a base; a pair of opposed, longitudinally extending faces terminating opposite said base in a pair of opposed, longitudinally extending gripping ears, each of said gripping ears having a gripping edge parallel to said common axis; a pair of diagonal axes extending between said gripping ears and a portion of said base longer than the cross-sectional length of either of said faces; whereby said gripping member is cammed into permanent gripping engagement with said tool shank upon being laterally displaced in either a clockwise or counterclockwise direction by said torque, one of said gripping ears engaging and gripping said tool shank upon clockwise displacement of said gripping member and the other of said ears engaging and gripping said tool shank upon counterclockwise displacement of said gripping member; and stop means for limiting the lateral displacement of said gripping member so that a predetermined amount of pressure is exerted between said tool shank and said gripping member when they are in permanent gripping engagement, said stop means comprising both sides of said slot, one side of said slot serving to locate said one gripping ear upon clockwise displacement of said gripping member and the other side of said slot serving to locate said other of said gripping ears upon counterclockwise displacement of said gripping member.
Claim 2
Dependent Claim
357 words
In a keyless chuck assembly having a plurality of gripping means located at equal angular distances from each other about a common axis and adapted to grip a tool shank inserted therein along said axis, the improvement therein which comprises: each of said gripping means including a jaw simultaneously movable both longitudinally and transversely of said common axis, axis; said jaw having an open slot extending longitudinally of its inner edge parallel to said common axis; a gripping member mounted in said open slot for free movement laterally of said common axis adapted to engage and permanently grip said tool shank solely as a result of being laterally displaced by the torque produced by the resistance of a workpiece to the turning movement of the tool shank; said gripping member is formed in the general shape of an elongated triangle, said triangle including: a base; a pair of opposed, longitudinally extending faces terminating opposite said base in a pair of opposed, longitudinally extending gripping ears, each of said gripping ears having a gripping edge parallel to said common axis; a pair of diagonal axes extending between said gripping ears and a portion of said base longer than the cross-sectional length of either of said faces; whereby said gripping member is cammed into permanent gripping engagement with said tool shank upon being laterally displaced in either a clockwise or counterclockwise direction by said torque, one of said gripping ears engaging and gripping said tool shank upon clockwise displacement of said gripping member and the other of said ears engaging and gripping said tool shank upon counterclockwise displacement of said gripping member; and stop means for limiting the lateral displacement of said gripping member so that a predetermined amount of pressure is exerted between said tool shank and said gripping member when they are in permanent gripping engagement, said stop means comprising both sides of said slot, one side of said slot serving to locate said one gripping ear upon clockwise displacement of said gripping member and the other side of said slot serving to locate said other of said gripping ears upon counterclockwise displacement of said gripping member.
Claim 3
Dependent Claim
81 words
A keyless chuck assembly as claimed in claim 1, wherein the angle between the respective sides of said slot and faces of said triangular gripping member is determined so that the pressure exerted between said tool shank and the respective gripping ears of said gripping member when in permanent gripping engagement is directed along a line at a predetermined angle to a line drawn normal to the tangent at the point where said respective gripping ears permanently engage said tool shank.
Claim 4
Dependent Claim
61 words
A keyless chuck assembly as claimed in claim 2, wherein the longitudinally extending faces of said gripping member are disposed at an angle to the respective sides of the slot so that when in permanent gripping engagement the pressure exerted between the tool shank and the respective gripping ears is directed along one of said diagonal axes of said gripping member.
Claim 5
Dependent Claim
17 words
A keyless chuck assembly as claimed in claim 2, wherein said predetermined angle is between 1* -l5*.
Claim 6
Dependent Claim
15 words
A keyless chuck assembly as claimed in claim 4, wherein said predetermined angle is 5*.
References Cited (Backward Citations)
US2215621A
Cited
US2811366A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |