Patent US2818985A successfully refreshed from Google Patents.
Patent US3889980A successfully refreshed from Google Patents.
US3889980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Three-point attachment device particularly for a tractor
Assignee: Walterscheid GmbH
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Filing: 1974-03-13
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Granted: 1975-06-17
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Expires: 1994-03-13
Abstract
Abstract A three-point tractor hitch comprising an upper guide member and two lower guide members spaced therebelow has a coupling hook pivotally mounted on the upper guide member and also axially adjustable with respect to the upper guide member. The lower guide members are also provided with coupling hooks and are resiliently spaced but relatively movable with respect to the upper coupling hook.
Inventors
- 👤 Hubert Geisthoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:08
CPC Classifications
A; A01; A01B; A01B59/00; A01B59/06; A01B59/066; A01B59/067; A01B59/002; A01B59/004; A01B59/006
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
88 words
A three-point hitch for tractors comprising an upper guide member of variable length including a carrier member, cross bars mounted on said carrier member, a pair of lower guide members below said upper guide member, linkage means pivotally connected to said cross bars for interconnecting said upper and lower guide members, coupling hooks on each of said lower guide members and said carrier member, and said linkage means including means for resiliently supporting said upper guide member in spaced but relatively moveable relationship to said lower guide members.
Claim 2
Dependent Claim
88 words
A three-point hitch for tractors comprising an upper guide member of variable length including a carrier member, cross bars mounted on said carrier member, a pair of lower guide members below said upper guide member, linkage means pivotally connected to said cross bars for interconnecting said upper and lower guide members, coupling hooks on each of said lower guide members and said carrier member, and said linkage means including means for resiliently supporting said upper guide member in spaced but relatively moveable relationship to said lower guide members.
Claim 3
Dependent Claim
22 words
A three-point hitch as claimed in claim 1 wherein the upper guide member coupling hook is pivotally mounted on said carrier member.
Claim 4
Dependent Claim
29 words
A three-point hitch as claimed in claim 1 and means for axially positioning said upper guide member hook with respect to the longitudinal axis of said upper guide member.
Claim 5
Dependent Claim
36 words
A three-point hitch as claimed in claim 1 wherein said carrier member includes a movably mounTed a tubular slide member and said coupling hook mounted on said slide member so that said hook is adjustable axially.
Claim 6
Dependent Claim
31 words
A three-point hitch as claimed in claim 3 and means for retaining said upper guide member hook in at least one position in which said hook can withstand only traction forces.
Claim 7
Dependent Claim
21 words
A three-point hitch as claimed in claim 4 wherein said cross bars extending outwardly from opposite sides of said slide member.
Claim 8
Dependent Claim
50 words
A three-point hitch as claimed in claim 1 and comprising locking means on said coupling hooks, means for retaining said upper guide member hook in at least one position in which said hook can withstand traction forces, and means for actuating simultaneously said locking means and said hook retaining means.
Claim 9
Dependent Claim
19 words
A three-point hitch as claimed in claim 4 and spring means connected between slide member and said carrier member.
Claim 10
Dependent Claim
31 words
A three-point hitch as claimed in claim 4 and cross bars extending laterally in opposite directions from said upper guide member, said slide member being adjustably mounted on said cross bars.
Claim 11
Dependent Claim
46 words
A three-point hitch as claimed in claim 1 and comprising a connecting tube on said upper guide member, said upper guide member hook having a fork joint and pivotally mounted on said tube for pivoting movement about an axis transverse to the opening of said hook.
Claim 12
Dependent Claim
54 words
A three-point hitch as claimed in claim 1 and a beam comprising a central portion and extension members protruding from both ends thereof, means for connecting said upper guide member to said central portion, and means including a telescoping tube and an angle member for connecting said extension members to said lower guide members.
Claim 13
Dependent Claim
35 words
A three-point hitch as claimed in claim 11 and means for pivotally connecting said extension members to said angle members, and means for limiting the relative movement between said extension members and said angle members.
Claim 14
Dependent Claim
53 words
A three-point hitch as claimed in claim 7 wherein said locking means on said upper coupling hook comprises a lever pivotally mounted on said hook such that an arm of said lever lockingly secures an element disposed in the hook opening, and an operating chain connected to the other arm of said lever.
Claim 15
Dependent Claim
72 words
A three-point hitch as claimed in claim 1 and a connecting tube on said upper guide member, a ratchet shaft within said connecting tube, pawl means movably mounted on said connecting tube and engagable with said ratchet shaft to position such shaft with respect to said connecting tube, and an operating lever on said connecting tube and disengaging said pawl means from said ratchet shaft upon pivoting movement of said operating lever.
Claim 16
Dependent Claim
82 words
A three-point hitch as claimed in claim 14 and a spindle shaft threadedly engaged within the end of said ratchet shaft away from said coupling hook, and means on said spindle shaft for retaining said spindle shaft against rotation within said ratchet shaft and spring means within said ratchet shaft bearing against a portion of said connecting tube and against a portion of said ratchet shaft to urge said ratchet shaft away from said coupling hook upon disengagement of said pawl means.
Claim 17
Dependent Claim
34 words
A three-point hitch as claimed in claim 15 and an annular indicator means on said spindle shaft to define the limit of axial movement of said spindle shaft with respect to said ratchet shaft.
Claim 18
Dependent Claim
29 words
A three-point hitch as claimed in claim 10 and comprising a frame interconnecting said lower guide members, and adjustable bar means adjustably fastening said connecting tube with said frame.
Claim 19
Dependent Claim
59 words
A three-point hitch as claimed in claim 1 wherein said linkage means has at its pivotal connection an arcuate member with a plurality of notches therein: a slidable sleeve on each of said cross bars and having a locking latch thereon engageable with one of said notches to lock in position the width adjustment of said lower guide members.
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) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |