Patent US3893580A successfully refreshed from Google Patents.
US3893580A
Expired / Lapsed
US
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Side and front tiltable lift truck mast
Assignee: Doosan Bobcat North America Inc
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Filing: 1973-12-12
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Granted: 1975-07-08
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Expires: 1993-12-12
Abstract
Abstract A lift truck mast supported from the truck frame by a main pair of universal connectors such as spherical bearings, a pair of tilt cylinders connected to the mast and to the truck by pairs of universal connectors for tilting the mast forwardly of the truck on said main pair of connectors, a side tilt cylinder connected to the mast for tilting the mast transversely of the truck on said main pair of connectors, and a side shift cylinder for actuating the mast laterally of the truck.
Inventors
- 👤 Daryl W Stevens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:33
CPC Classifications
B; B66; B66F; B66F9/00; B66F9/06; B66F9/075; B66F9/08; B66F9/082; B60; B60G; B60G2204/00; B60G2204/10; B60G2204/11; B60G2300/00; B60G2300/02; B60G2300/022; B60G2400/00; B60G2400/60
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
161 words
In a lift truck having an upright mast assembly mounted from one end of the truck, first bearing means comprising a pair of transversely spaced universal type bearings supported from the truck and supporting the mast assembly for arcuate movement both longitudinally and transversely of the truck, forward tilt means connected to the mast assembly for actuating it arcuately on said first bearing means in a direction longitudinal of the truck, second bearing means connecting said forward tilt means to the truck and to the mast assembly such that said tilt means pivots generally transversely of the truck during transverse arcuate movement of said mast assembly on said first bearing means, and side tilt means for actuating said mast assembly in said transverse arcuate movement on said first bearing means, at least a portion of said forward tilt means being connected to said mast assembly by means movable longitudinally relative to the mast assembly during side tilting movements of the mast.
Claim 2
Dependent Claim
161 words
In a lift truck having an upright mast assembly mounted from one end of the truck, first bearing means comprising a pair of transversely spaced universal type bearings supported from the truck and supporting the mast assembly for arcuate movement both longitudinally and transversely of the truck, forward tilt means connected to the mast assembly for actuating it arcuately on said first bearing means in a direction longitudinal of the truck, second bearing means connecting said forward tilt means to the truck and to the mast assembly such that said tilt means pivots generally transversely of the truck during transverse arcuate movement of said mast assembly on said first bearing means, and side tilt means for actuating said mast assembly in said transverse arcuate movement on said first bearing means, at least a portion of said forward tilt means being connected to said mast assembly by means movable longitudinally relative to the mast assembly during side tilting movements of the mast.
Claim 3
Dependent Claim
29 words
A lift truck as claimed in claim 1 wherein said first bearing means are spherical bearings and said second bearing means comprises at least a pair of spherical bearings.
Claim 4
Dependent Claim
43 words
A lift truck as claimed in claim 1 wherein said forward tilt means comprises a pair of transversely spaced hydraulic cylinder means connected to the truck and to opposite sides of the mast assembly each by a pair of said second bearing means.
Claim 5
Dependent Claim
52 words
A lift truck as claimed in claim 3 wherein the one tilt cylinder means comprises said portion of the tilt means which is connected to the mast by the relatively movable means and the other tilt cylinder means is connected tO the mast by relatively immovable means during side tilting mast movements.
Claim 6
Dependent Claim
33 words
A lift truck as claimed in claim 1 wherein said side tilt means comprises a hydraulic cylinder means connected to the mast assembly which extends upwardly adjacent one side of the mast assembly.
Claim 7
Dependent Claim
43 words
A lift truck as claimed in claim 5 wherein said mast assembly can be disassembled from said truck following disconnection of said forward tilt means from the mast assembly or from the truck, and disconnection of said first bearing means from the truck.
Claim 8
Dependent Claim
61 words
A lift truck as claimed in claim 1 wherein said first bearing means are slidably mounted on a transverse shaft means inwardly of the ends thereof, said shaft means being supported from the truck, and side shift means being connected to said mast assembly for actuating it on said first bearing means along said shaft means and laterally of the truck.
Claim 9
Dependent Claim
23 words
A lift truck as claimed in claim 7 wherein said side shift means comprises a hydraulic cylinder means supported from said shaft means.
Claim 10
Dependent Claim
58 words
A lift truck as claimed in claim 8 wherein said mast assembly can be disassembled from said truck by disconnecting said transverse shaft means from the truck, and disconnecting said forward tilt means from the mast assembly or from the truck, both said side shift and side tilt means being connected to and carried by said mast assembly.
Claim 11
Dependent Claim
43 words
A lift truck as claimed in claim 1 wherein said mast assembly can be disassembled from said truck following disconnection of said forward tilt means from the mast assembly or from the truck and disconnection of said first bearing means from the truck.
Claim 12
Dependent Claim
16 words
A lift truck as claimed in claim 1 wherein said universal type bearings are spherical bearings.
Claim 13
Dependent Claim
136 words
In a lift truck having an upright mast assembly mounted from one end of the truck, first bearing means comprising a pair of transversely spaced spherical bearings supported from the truck and supporting the mast assembly for arcuate movement both longitudinally and transversely of the truck, forward tilt means connected to the mast assembly for actuating it arcuately on said first bearing means in a direction longitudinal of the truck forwardly and rearwardly of a central position, second bearing means connecting said forward tilt means to the truck and to the mast assembly such that said tilt means pivots generally transversely of the truck during transverse arcuate movement of said mast assembly on said first bearing means, and side tilt means for actuating said mast assembly in said transverse arcuate movement on said first bearing means.
Claim 14
Dependent Claim
136 words
In a lift truck having an upright mast assembly mounted from one end of the truck, first bearing means comprising a pair of transversely spaced spherical bearings supported from the truck and supporting the mast assembly for arcuate movement both longitudinally and transversely of the truck, forward tilt means connected to the mast assembly for actuating it arcuately on said first bearing means in a direction longitudinal of the truck forwardly and rearwardly of a central position, second bearing means connecting said forward tilt means to the truck and to the mast assembly such that said tilt means pivots generally transversely of the truck during transverse arcuate movement of said mast assembly on said first bearing means, and side tilt means for actuating said mast assembly in said transverse arcuate movement on said first bearing means.
Claim 15
Dependent Claim
50 words
A lift truck as claimed in claim 12 wherein said second bearing means comprises spherical bearings, and said forward tilt means comprises a pair of hydraulic tilt cylinder means connected to the truck and to opposite sides of the mast assembly each by a pair of said second bearing means.
Claim 16
Dependent Claim
40 words
A lift truck as claimed in claim 12 wherein at least a portion of said forward tilt means is connected to said mast assembly by means movable longitudinally relative to the mast assembly during side tilting movements of the mast.
Claim 17
Dependent Claim
50 words
A lift truck as claimed in claim 1 wherein the said connecting means of said tilt means to said mast assembly includes a connecting member supported from one of the universal type bearings at one end and secured to said portion of said forward tilt means at the other end.
Claim 18
Dependent Claim
38 words
A lift truck as claimed in claim 15 wherein said connecting member is generally L-shaped, the horizontal portion thereof being secured to said universal type bearing and the vertical portion thereof being secured to said forward tilt means.
Claim 19
Dependent Claim
27 words
A lift truck as claimed in claim 15 wherein guide means is secured to one outer lower side portion of the mast for receiving said connecting member.
Claim 20
Dependent Claim
26 words
A lift truck as claimed in claim 17 wherein said guide means moves with said mast during side tilting thereof and relative to said connecting member.
Claim 21
Dependent Claim
35 words
A lift truck as claimed in claim 15 wherein said sIde tilt means is operatively connected at its one end to said one of the universal type bearings and its other end to the mast.
Claim 22
Dependent Claim
41 words
A lift truck as claimed in claim 1 wherein guide means is secured to the one outer lower side portion of the mast assembly for guiding the mast assembly during said longitudinal movement relative to said portion of said tilt means.
Claim 23
Dependent Claim
65 words
A lift truck as claimed in claim 1 wherein said portion of said forward tilt means comprises a first mast tilt actuator means connected at one side of said mast, said tilt means including also a second mast tilt actuator means connected to the other side of the mast by means not movable longitudinally relative to the mast during side tilting movements of the mast.
References Cited (Backward Citations)
US3515301A
Cited
US3490633A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |