US3685843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulated chuck
Assignee: GW Murphy Industries Inc
•
Filing: 1970-01-12
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Granted: 1972-08-22
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Expires: 1990-01-12
Abstract
Abstract An insulated chuck is provided for a motor driven tool such as a portable electric drill. The chuck can be mounted on a spindle driven by the motor of the drill and its tool holding jaws separated from the motor driven spindle by an electrical insulating member which blocks passage of electrical current between the tool holding jaws of the chuck and the motor and/or user. In the preferred form as described, the insulating member is integrally molded partly within a receiver opening toward the proximal end of the chuck and the member completely surrounds the threaded end of the motor driven spindle. The insulating member extends to the outermost edge of the chuck at the proximal or spindle receiving end thereof and is internally threaded to receive the spindle. The insulating member includes a locking ring portion extending into an annular groove in the receiver wall and radial locking ribs for locking the member against axial or rotational movement relative to the remainder of the chuck. A steel nut is imbedded and locked in and surrounded by the insulating material at the proximal end of the chuck with the threads of the nut contiguous with threads in the insulating material.
Inventors
- 👤 Anthony Jacyno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:14
CPC Classifications
B; B23; B23B; B23B45/00; B23B45/02; B23B31/00; B23B31/02; B23B31/10; B23B31/12; B23B31/1207; H; H02; H02K; H02K7/00; H02K7/14; H02K7/145; Y; Y10; Y10S; Y10S408/00; Y10S408/71; Y10T; Y10T279/00; Y10T279/35; Y10T408/00; Y10T408/94; Y10T408/95
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
67 words
In a power tool having a housing and including a motor driven spindle of electrically conductive material for rotatably driving a chuck, a chuck comprising means for releasably receiving and securely holding a tool at its distal end to be rotated with the chuck and insulating means in the chuck and immovably affixed thereto for rotation therewith for electrically insulating said tool holding means from the spindle.
Claim 2
Dependent Claim
67 words
In a power tool having a housing and including a motor driven spindle of electrically conductive material for rotatably driving a chuck, a chuck comprising means for releasably receiving and securely holding a tool at its distal end to be rotated with the chuck and insulating means in the chuck and immovably affixed thereto for rotation therewith for electrically insulating said tool holding means from the spindle.
Claim 3
Dependent Claim
38 words
The device of claim 1 wherein said insulating means extends the width of the chuck to the outer edge of the chuck at the proximal spindle receiving end thereof for preventing spark jump between the chuck and spindle.
Claim 4
Dependent Claim
13 words
The device of claim 2 wherein the power tool includes an electric motor.
Claim 5
Dependent Claim
12 words
The device of claim 3 wherein said tool is a portable tool.
Claim 6
Dependent Claim
115 words
In a power tool having a housing and including a motor driven spindle of electrically conductive material for driving a chuck, a chuck comprising means for releasably receiving and securely holding a tool at its distal end to be rotated with the chuck and insulating means in the chuck for electrically insulating said tool holding means from the spindle, said insulating means extending the width of the chuck to the outer edge of the chuck at the proximal spindle receiving end thereof for preventing spark jump between the chuck and spindle, said power tool being a portable tool and including an electric motor, and means establishing an air gap between the chuck and tool housing.
Claim 7
Dependent Claim
115 words
In a power tool having a housing and including a motor driven spindle of electrically conductive material for driving a chuck, a chuck comprising means for releasably receiving and securely holding a tool at its distal end to be rotated with the chuck and insulating means in the chuck for electrically insulating said tool holding means from the spindle, said insulating means extending the width of the chuck to the outer edge of the chuck at the proximal spindle receiving end thereof for preventing spark jump between the chuck and spindle, said power tool being a portable tool and including an electric motor, and means establishing an air gap between the chuck and tool housing.
Claim 8
Dependent Claim
14 words
The device of claim 4 wherein said portable tool is a portable electric drill.
Claim 9
Dependent Claim
133 words
In a power tool having a housing and including a motor driven spindle of electrically conductive material for driving a chuck, a chuck comprising means for releasably receiving and securely holding a tOol at its distal end to be rotated with the chuck and insulating means in the chuck for electrically insulating said tool holding means from the spindle, said insulating means extending the width of the chuck to the outer edge of the chuck at the proximal spindle receiving end thereof for preventing spark jump between the chuck and the spindle, the insulating means being a member in a receiver of the chuck and extending from the receiver to define the proximal end of the chuck and including a metal female threaded male member embedded in and surrounded by the insulating member.
Claim 10
Dependent Claim
133 words
In a power tool having a housing and including a motor driven spindle of electrically conductive material for driving a chuck, a chuck comprising means for releasably receiving and securely holding a tOol at its distal end to be rotated with the chuck and insulating means in the chuck for electrically insulating said tool holding means from the spindle, said insulating means extending the width of the chuck to the outer edge of the chuck at the proximal spindle receiving end thereof for preventing spark jump between the chuck and the spindle, the insulating means being a member in a receiver of the chuck and extending from the receiver to define the proximal end of the chuck and including a metal female threaded male member embedded in and surrounded by the insulating member.
Claim 11
Dependent Claim
41 words
The device of claim 7 wherein the imbedded metal member is generally flush with the insulating material at the proximal end of the chuck for assisting in starting threading of the chuck on the spindle properly and without stripping of threads.
Claim 12
Dependent Claim
57 words
The device of claim 8 wherein the threads of the metal member extend contiguously with female threads in the insulating member and the insulating member completely surrounds the spindle and extends between the imbedded metal member and the remainder of the chuck and is coextensive with the outer edge of the chuck at the proximal end thereof.
Claim 13
Dependent Claim
46 words
The device of claim 9 wherein said insulating member includes an integral outwardly projecting ring portion received in a groove in the wall of the insert receiver for assisting in preventing axial movement of the insulating member relative to the electrically conductive portion of the chuck.
Claim 14
Dependent Claim
39 words
The device of claim 10 wherein the insulating material of the insulating member extends into a peripheral groove in the imbedded metal member to assist in preventing axial movement of the imbedded metal member relative to the insulating member.
Claim 15
Dependent Claim
38 words
The device of claim 11 wherein said insulating member includes radial projections received in radial grooves of the electrically conductive portion of the chuck for locking against relative rotation between the conductive metal portion and the insulating member.
Claim 16
Dependent Claim
30 words
The device of claim 7 wherein the imbedded metal member is a nut having corners imbedded in the insulating material and inhibiting relative movement of the nut and insulating material.
Claim 17
Dependent Claim
19 words
The device of claim 7 wherein said insulating member comprises a plastic member molded in situ within the receiver.
Claim 18
Dependent Claim
20 words
The device of claim 7 wherein said insert and insulating member are locked together against relative rotational and axial movement.
Claim 19
Dependent Claim
88 words
In a power tool having a housing and including a motor driven spindle of electrically conductive material for driving a chuck, a chuck comprising means for releasably receiving and securely holding a tool at its distal end to be rotated with the chuck and insulating means in the chuck for electrically insulating said tool holding means from the spindle, said insulating means including means for locking itself to an electrically conductive jaw bearing portion of the chuck and against axial and rotational movement relative to said conductive portion.
Claim 20
Dependent Claim
88 words
In a power tool having a housing and including a motor driven spindle of electrically conductive material for driving a chuck, a chuck comprising means for releasably receiving and securely holding a tool at its distal end to be rotated with the chuck and insulating means in the chuck for electrically insulating said tool holding means from the spindle, said insulating means including means for locking itself to an electrically conductive jaw bearing portion of the chuck and against axial and rotational movement relative to said conductive portion.
Claim 21
Dependent Claim
24 words
The device of claim 1 wherein the tool housing contains an electric motor and suitable wiring and the housing is of electrically nonconductive material.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |