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US3811338A Expired / Lapsed US ⏱️ 0.0 years remaining

Latch mechanism

Assignee: Garden Way Inc
•
Filing: 1972-11-20
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Granted: 1974-05-21
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Expires: 1992-11-20
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Abstract

Abstract A vehicle mounted lift assembly having latch mechanisms for latching pivoted lift arms in an uplift position whereby an implement, particularly a powered rotary mower, connected to the lift arms can be automatically latched in an elevated position while other implements are being raised or lowered by the lift assembly. The latch mechanisms each include a pivotal and an axially translatable bolt having a non-circular end portion which is slidably received in a complementary non-circular opening when in an arm latching position. The bolt is manually movable to an unlatched position with the non-circular portion moved axially out of engagement with the non-circular opening, and with the bolt then being pivoted about its axis to preclude registration of the non-circular portion with the non-circular opening. A combination torsion-compression spring is prestressed to normally exert a compressive force tending to hold the bolt in latching position, and to normally exert a torsional force tending to pivot and maintain the bolt in its unlatched position. A cam face on the latch bolt automatically locks the associated lift arm in raised position in response to movement of the lift arm into its raised position only if the bolt has been pivoted to its latching position.

Inventors

  • 👤 J Federspiel

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-07 19:44
CPC Classifications
B; B60; B60P; B60P1/00; B60P1/04; B60P1/28; B60P1/283; A; A01; A01D; A01D2101/00; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20576; Y10T74/20636

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 146 words
A latch mechanism in the lift assembly of a vehicle adapted to latch a lift arm of the assembly in a raised position, the mechanism comprising: support means for supporting the latch mechanism on the chassis of the vehicle, an elongated latch member having first and second longitudinally spaced ends, a cam face at the first end of the latch member, and spring means for urging the latch member in a first longitudinal direction to a latching position wherein the first end of the latch member can latch the aforementioned lift arm in a raised position, the latch member being manually movable against the resilient force of the spring means in a second longitudinal direction to an unlatched position, the latch member being rotatable while in the unlatched position, said spring means additionally applying a torsional force for holding the latch member in the unlatched position.
Claim 2
Dependent Claim 146 words
A latch mechanism in the lift assembly of a vehicle adapted to latch a lift arm of the assembly in a raised position, the mechanism comprising: support means for supporting the latch mechanism on the chassis of the vehicle, an elongated latch member having first and second longitudinally spaced ends, a cam face at the first end of the latch member, and spring means for urging the latch member in a first longitudinal direction to a latching position wherein the first end of the latch member can latch the aforementioned lift arm in a raised position, the latch member being manually movable against the resilient force of the spring means in a second longitudinal direction to an unlatched position, the latch member being rotatable while in the unlatched position, said spring means additionally applying a torsional force for holding the latch member in the unlatched position.
Claim 3
Dependent Claim 79 words
A latch comprising; a latch bolt having a pivot axis and including a non-circular body portion and a transverse abutment surface, means for mounting said body for limited translatory movement along said pivot axis and for limited pivotal movement about said axis, and resilient means connected between said bolt and said mounting means for normally urging said bolt along said axis toward a latching position and for urging said bolt to pivot about said axis toward an unlatched position.
Claim 4
Dependent Claim 79 words
A latch comprising; a latch bolt having a pivot axis and including a non-circular body portion and a transverse abutment surface, means for mounting said body for limited translatory movement along said pivot axis and for limited pivotal movement about said axis, and resilient means connected between said bolt and said mounting means for normally urging said bolt along said axis toward a latching position and for urging said bolt to pivot about said axis toward an unlatched position.
Claim 5
Dependent Claim 122 words
A latch according to claim 2 wherein said mounting means includes a guide member disposed transversely of said axis for defining a transverse abutment and a non-circular opening complimentary to said non-circular body, said bolt being selectively movable into either a translatory position wherein said non-circular body is slidably received in said non-circular opening for allowing said resilient means to resiliently translate said bolt into said latching position, or in a pivotal position wherein said non-circular body is withdrawn from said non-circular opening for causing said resilient means to transversely twist about said axis and maintain said transverse abutment surface of said bolt in engagement with said transverse surface of said mounting means to resiliently lock said bolt in said unlatched position.
Claim 6
Dependent Claim 16 words
A latch according to claim 3 wherein said non-circular body and said non-circular opening are square.
Claim 7
Dependent Claim 22 words
A latch according to claim 2 wherein said resilient means is a single spring which is prestressed in both compression and torsion.

References Cited (Backward Citations)

US1718995A Cited
US3141493A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-05-20 1977-11-19 1978-05-21 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-05-20 1981-11-19 1982-05-21 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-05-20 1985-11-19 1986-05-21 $7700.00 Window Closed / Lapsed

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