US3643976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Latch for draft arm extension
Assignee: Deutz Allis Corp
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Filing: 1970-10-19
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Granted: 1972-02-22
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Expires: 1990-10-19
Abstract
Abstract An extendible draft arm including an extendible member telescoping in a base member with a latch to retain the draft arm in its retracted position.
Inventors
- 👤 Robert C Haupt
- 👤 Donald E Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:10
CPC Classifications
A; A01; A01B; A01B59/00; A01B59/06; A01B59/061; A01B59/063
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
153 words
A latch for use in an extendible draft arm of a tractor three-point hitch comprising, a lower draft arm including a draft link adapted for connection to a tractor, a draft arm extension telescoping within said draft link, hook means on the inner end of said draft arm extension defining a latch engaging surface normal to the axis of said extension, a latch on said draft link for moving normally to the axis of said link and latching said extension in a contracted position in said draft link including, a latch housing connected to said draft link, a latch block slidably moving in said draft link, a latch handle extending through said latch housing connected to said latch block, means resiliently biasing said latch block to a latched position engaging the hook of said draft arm extension, a retainer on said housing for selective positioning to retain said latch in an unlatched position.
Claim 2
Dependent Claim
153 words
A latch for use in an extendible draft arm of a tractor three-point hitch comprising, a lower draft arm including a draft link adapted for connection to a tractor, a draft arm extension telescoping within said draft link, hook means on the inner end of said draft arm extension defining a latch engaging surface normal to the axis of said extension, a latch on said draft link for moving normally to the axis of said link and latching said extension in a contracted position in said draft link including, a latch housing connected to said draft link, a latch block slidably moving in said draft link, a latch handle extending through said latch housing connected to said latch block, means resiliently biasing said latch block to a latched position engaging the hook of said draft arm extension, a retainer on said housing for selective positioning to retain said latch in an unlatched position.
Claim 3
Dependent Claim
47 words
A latch for use in an extendible draft arm of a tractor three-point hitch as set forth in claim 1 including a retainer pin, on said latch handle means, a retainer sleeve in said retainer engaging said retainer pin to maintain said latch in an unlatched position.
Claim 4
Dependent Claim
82 words
A latch for use in an extendible draft arm of a tractor three-point hitch as set forth in claim 1 wherein said retainer includes a sleeve defining an axial slot positioned for rotatably moving around said latch handle, a sleeve handle on said retainer sleeve for rotating said sleeve around said latch handle, protruding means on said latch handle for reception in said slot to permit said latch to engage when said means is received in said slot of said retainer sleeve.
Claim 5
Dependent Claim
66 words
A latch for use in an extendible draft arm of a tractor three-point hitch as set forth in claim 1 wherein said latch includes a stem on said latch handle, a pin positioned in said stem and extending radially therefrom, a sleeve embracing said stem and defining an axial slot adapted for reception of said pin to permit said latch to move into the latch position.
Claim 6
Dependent Claim
95 words
A latch for use in an extendible draft arm of a tractor three-point hitch as set forth in claim 1 wherein said draft link defines a central opening, said hook on said draft arm extension defines a transverse latch engaging surface for engaging said latch block the full width of said opening, means defining a lateral surface on said latch block extending the full width of said opening in said draft link to thereby provide engaging surfaces of said latch block and said hook throughout the width of the central opening of said draft link.
Claim 7
Dependent Claim
120 words
A latch for use in an extendible draft arm of a tractor three-point hitch as set forth in claim 1 wherein said draft arm extension defines a locking surface on the side of said draft arm extension, a recessed portion on the side of said draft arm extension extending for a substantial portion on the side of said draft arm extension, a stop element positioned on the side of said draft link and extending into said recessed portion of said draft arm extension, said hook means and latch thereby defining the retracted position of said draft arm extension and said stop element engaging said locking surface of said draft arm extension defining the extended position of said draft arm extension.
Claim 8
Dependent Claim
100 words
A latch for use in a draft arm of an extendible tractor three-point hitch as set forth in claim 1 wherein said draft link defines an opening extending on the downwardly through the upper wall of said draft link for the reception of said latch block, an inner surface defined by the upper wall of said draft link, said retainer defining a sleeve of greater vertical dimension than the hook engaging portion of said latch block to thereby retain the latch block above the lower inner surface of the upper wall of said draft link when said latch is retracted.
Claim 9
Dependent Claim
86 words
A latch for use in an extendible draft arm of a tractor three-point hitch as set forth in claim 1 wherein said draft link defines a vertical opening forming vertical surface on said draft link, said hook of said draft arm extension defines a parallel surface with the surfaces of said opening, said latch block defines parallel surfaces on the surfaces engaging said hole of said draft link and the hook of said draft arm extension to thereby Reduce rotational torque created on said latch block.
Claim 10
Dependent Claim
59 words
A latch for use in a draft arm of an extendible tractor three-point hitch as set forth in claim 1 wherein said hook means on said draft arm extension defines a ramp adapted for engaging said latch block to permit said hook to ride under said latch block when said draft arm extension is contracted within said draft link.
Claim 11
Dependent Claim
55 words
A latch for use in an extendible draft arm of a tractor three-point hitch as set forth in claim 1 wherein said draft arm extension defines an intermediate recessed lateral portion to permit lateral movement of the draft arm extension when the extension is extended from the draft link to facilitate coupling to an implement.
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) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |