US3982616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Latch operated centrifugally released safety clutch for saws
Assignee: Textron Inc
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Filing: 1975-07-25
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Granted: 1976-09-28
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Expires: 1995-07-25
Abstract
Abstract A safety coupling for quickly disconnecting a cutting instrumentality from the power source of a hand-held power tool comprises a pawl on a rotating driving member engaging an abutment on a coaxial driven member. During normal operation a trip arm holds the pawl engaged. When the trip arm is tripped to release the pawl, a latch prevents reengagement of the pawl until reset.
Inventors
- 👤 Edward J. Bidanset
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:53
CPC Classifications
F; F16; F16D; F16D11/00; F16D11/02; F16D11/06; B; B27; B27B; B27B17/00; B27B17/08; B27B17/083; F16D67/00; F16D67/02
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
110 words
A safety coupling comprising a first rotatable member having at least one abutment, a second rotatable member adjacent said first rotatable member and coaxial therewith, pawl means pivotally mounted eccentrically on said second rotatable member for movement between a position in which it engages said abutment to provide a driving connection between said first and second rotatable members and a position in which it is disengaged from said abutment, first latch means for releasably holding said pawl means in engaged position, means for releasing said first latch means for movement of said pawl means to disengaged position and second latch means for thereupon preventing reengagement of said pawl means with
Claim 2
Dependent Claim
110 words
A safety coupling comprising a first rotatable member having at least one abutment, a second rotatable member adjacent said first rotatable member and coaxial therewith, pawl means pivotally mounted eccentrically on said second rotatable member for movement between a position in which it engages said abutment to provide a driving connection between said first and second rotatable members and a position in which it is disengaged from said abutment, first latch means for releasably holding said pawl means in engaged position, means for releasing said first latch means for movement of said pawl means to disengaged position and second latch means for thereupon preventing reengagement of said pawl means with
Claim 3
Dependent Claim
11 words
A safety coupling according to claim 1, comprising spring means for
Claim 4
Dependent Claim
76 words
A safety coupling according to claim 2, in which the center of mass of said pawl means is eccentrically located with respect to the pivot of the pawl means to provide centrifugal force acting in a direction to disengage said pawl from said abutment, said force being sufficient when said second rotatable member is rotated at or above a selected speed to overcome said biasing means and move said pawl means from engaged to disengaged position
Claim 5
Dependent Claim
34 words
A safety coupling according to claim 1, in which said pawl means comprises an annular member encircling the axis of rotation of said rotatable members and having a nose portion engageable with said abutment.
Claim 6
Dependent Claim
49 words
A safety coupling according to claim 4, in which said first latch means comprises a trip arm pivotally mounted on said second rotatable member and having a portion engageable with said annular member in latched position of said trip arm to retain said nose portion in engagement with said
Claim 7
Dependent Claim
49 words
A safety coupling according to claim 5 comprising means for biasing said trip arm to released position when said second rotatable member is stationary, the center of mass of said trip arm being eccentrically located with respect to the pivot of said trip arm to bias said trip arm
Claim 8
Dependent Claim
36 words
A safety coupling according to claim 5, in which said second latch means comprises a release arm pivotally mounted on said annular member for movement between an inactive position and an active position in which it
Claim 9
Dependent Claim
49 words
A safety coupling according to claim 7 comprising an actuating member movable between a release position in which it is engaged with said trip arm to release said annular member to disengage said nose portion from said abutment and a reset position in which it is engaged with said
Claim 10
Dependent Claim
36 words
A safety coupling according to claim 4, in which said second latch means comprises a release arm pivotally mounted on said annular member for movement between an inactive position and an active position in which it
Claim 11
Dependent Claim
35 words
A safety coupling according to claim 9 comprising means for biasing said release arm toward active position and means for retaining said release arm in inactive position when said pawl means is held in engaged
Claim 12
Dependent Claim
47 words
A safety coupling according to claim 10, in which said means for biasing said release arm comprises location of the center of mass of said release arm eccentrically of the pivot of said release arm to provide centrifugal force biasing said release arm toward active position when
Claim 13
Dependent Claim
71 words
A safety coupling according to claim 4, in which the center of mass of said annular member is located eccentrically with respect to the pivot of said annular member to provide centrifugal force when said second rotatable member is rotated, said centrifugal force acting in a direction to disengage said nose portion from said abutment of said first rotatable member when said annular member is released by said first latch means.
Claim 14
Dependent Claim
48 words
A safety coupling according to claim 12, comprising spring means for biasing said annular member in a direction to move said nose portion to a position for engaging said abutment, the bias of said spring means being less than said centrifugal force when said second rotatable member is
Claim 15
Dependent Claim
50 words
A safety coupling according to claim 1, comprising an actuating member movable between a release position for actuating said first latch means for movement of said pawl means to disengaged position and a reset position for actuating said second latch means for reengagement of said pawl means with said abutment.
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) | 1979-09-28 | 1980-03-29 | 1980-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-28 | 1984-03-29 | 1984-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-28 | 1988-03-29 | 1988-09-28 | $7700.00 | Window Closed / Lapsed |