Patent US3801068A successfully refreshed from Google Patents.
US3801068A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic folding landing gear
Assignee: KOGEN IND Inc
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Filing: 1972-12-22
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Granted: 1974-04-02
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Expires: 1992-12-22
Abstract
Abstract A folding landing leg assembly for a tractor trailer or the like. The assembly has a main leg pivoted on a bracket with a telescoping foot-carrying portion having a traveling nut engaged by a screw journalled axially in the main leg. The screw is driven by a hand crank through a crankshaft coaxial with the main leg pivot axis and gearing. The main leg is also connected to the bracket by a pair of link arms, the lower link arm being secured to a transverse shaft journalled in the main leg. A cam on this shaft is engagable by a transverse pin on the foot-carrying portion to automatically fold the leg assembly when the footcarrying portion is elevated by operating the hand crank.
Inventors
- 👤 P Kopas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:23
CPC Classifications
B; B60; B60S; B60S9/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
133 words
In a vehicle, a folding landing leg assembly comprising a tubular main leg member pivoted to the vehicle for swinging movement from an elevated position to a substantially vertical position, a foot-carrying member telescopically received in said main leg member, a nut member secured on said foot-carrying member, a screw member longitudinally journalled in said main leg member and threadedly engaging said nut member, means to rotate said screw member, whereby to move said foot-carrying member longitudinally in said main leg member, linkage means connecting the main leg member to the vehicle, and cooperating pin and cam means on the foot-carrying member and the linkage means to drivingly operate said linkage means so as to swing said main leg member responsive to longitudinal movement of the foot-carrying member in the main leg member.
Claim 2
Dependent Claim
133 words
In a vehicle, a folding landing leg assembly comprising a tubular main leg member pivoted to the vehicle for swinging movement from an elevated position to a substantially vertical position, a foot-carrying member telescopically received in said main leg member, a nut member secured on said foot-carrying member, a screw member longitudinally journalled in said main leg member and threadedly engaging said nut member, means to rotate said screw member, whereby to move said foot-carrying member longitudinally in said main leg member, linkage means connecting the main leg member to the vehicle, and cooperating pin and cam means on the foot-carrying member and the linkage means to drivingly operate said linkage means so as to swing said main leg member responsive to longitudinal movement of the foot-carrying member in the main leg member.
Claim 3
Dependent Claim
38 words
The folding landing assembly of claim 1, and wherein the means to rotate said screw member comprises a transverse drive shaft journalled in the main leg member, and means drivingly coupling said drive shaft to the screw member.
Claim 4
Dependent Claim
25 words
The folding landing leg assembly of claim 2, and wherein said coupling means comprises a gear train between said drive shaft and said screw member.
Claim 5
Dependent Claim
28 words
The folding landing leg assembly of claim 2, and wherein the transverse drive shaft is coaxial with the pivotal connection of the main leg member to the vehicle.
Claim 6
Dependent Claim
35 words
The folding landing leg assembly of claim 4, and wherein said coupling means comprises a pinion gear on the drive shaft and a beveled gear on the screw member meshingly engaged with said pinion gear.
Claim 7
Dependent Claim
38 words
The folding landing leg assembly of claim 1, and wherein said linkage means comprises an upper link arm pivotally connected to the vehicle and a lower link arm connecting the main leg member to the upper link arm.
Claim 8
Dependent Claim
75 words
The folding landing leg assembly of claim 6, and wherein said pin and cam means comprises a pin element on the foot-carrying member and a cam in the main leg member rigidly connected to the lower link arm and having a cam slot in which the pin element is engagable, the slot being shaped to rotate the lower link arm relative to the main leg member responsive to the engagement of the pin element therewith.
Claim 9
Dependent Claim
52 words
The folding landing leg assembly of claim 7, and wherein the connection of the lower link arm to the main leg member comprises a transverse shaft element rigidly connected to the lower link arm and journalled transversely in the main leg member, said cam being rigidly secured on said transverse shaft element.
Claim 10
Dependent Claim
57 words
The folding landing leg assembly of claim 8, and wherein the top end of the cam is formed with a locking slot and the foot-carrying member is provided with an abutment element engagable in said locking slot when the foot-carrying member is extended downwardly after being rotated to a substantiaLly vertical position with the main leg member.
Claim 11
Dependent Claim
52 words
The folding landing leg assembly of claim 9, and wherein the link arms are substantially channel-shaped, the lower link arm being nestingly receivable in the upper link arm and the main leg member being nestingly receivable in the lower link arm when the main leg member is in its uppermost elevated position.
Claim 12
Dependent Claim
32 words
The folding landing leg assembly of claim 1, and wherein said foot-carrying member is at times telescopically movable relative to said main leg member without interengagement of said pin and cam means.
Claim 13
Dependent Claim
37 words
The folding landing leg assembly of claim 11, and wherein the telescopic movement of the foot-carrying member without interengagement of said pin and cam means occurs when said main leg member is in said substantially vertical position.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |