US3640414A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Push-pull attachment for lift trucks
Assignee: Brudi Equipment Inc
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Filing: 1970-03-02
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Granted: 1972-02-08
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Expires: 1990-03-02
Abstract
Abstract A novel lazy tongs has offset pivotal connections between the arms of the linkage allowing the arms to fold together compactly in vertical positions. The lazy tongs linkage actuates a push frame for pushing a load off the forks of the lift truck. An adjustable length connection between the upper forward arm and the push frame allows the upper end of the push frame to be tilted backward in extended position of the linkage so that the thrust may be applied principally at the bottom of the load. Since the adjustable length arm is vertical in retracted position, the push frame is always vertical in retracted position regardless of its tilt in extended position. The rearward tilt of the push frame in extended position is also advantageous in grasping sheetlike pallets to pull a pallet load onto the forks of the truck. The lower edge of the push frame may be equipped with pallet grippers for this purpose.
Inventors
- 👤 Ronald A Brudi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:32
CPC Classifications
B; B66; B66F; B66F9/00; B66F9/06; B66F9/075; B66F9/12; B66F9/19; B66F9/195
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
145 words
In a lift truck having a load carriage mounted for vertical movement on a mast, a push frame for pushing a load off said carriage, and a pair of lazy tongs on opposite sides of said carriage for operating said push frame, each of said lazy tongs having an arm pivotally connected to a lower portion of said push frame and an arm movable in a vertical guide in said push frame above said pivotal connection, said last arm being a straight, rigid unitary member of a length to tilt said push frame backward as the push frame is extended, said two arms folding into side by side positions parallel with each other and parallel with said mast when the push frame is retracted, causing said push frame to retract to a position parallel with said mast regardless of the length of said last arm.
Claim 2
Dependent Claim
145 words
In a lift truck having a load carriage mounted for vertical movement on a mast, a push frame for pushing a load off said carriage, and a pair of lazy tongs on opposite sides of said carriage for operating said push frame, each of said lazy tongs having an arm pivotally connected to a lower portion of said push frame and an arm movable in a vertical guide in said push frame above said pivotal connection, said last arm being a straight, rigid unitary member of a length to tilt said push frame backward as the push frame is extended, said two arms folding into side by side positions parallel with each other and parallel with said mast when the push frame is retracted, causing said push frame to retract to a position parallel with said mast regardless of the length of said last arm.
Claim 3
Dependent Claim
26 words
The invention of claim 1 including a length adjustment in said last arm to vary the angle of tilt of said push frame in extended position.
Claim 4
Dependent Claim
62 words
The invention of claim 1, said lazy tongs having four arms connected together in pairs on offset pivots causing pairs of the arms to lie flat against each other in a common transverse plane of contact parallel with said mast, whereby said push frame is retracted to a position parallel with said mast regardless of its angle of tilt in extended position.
Claim 5
Dependent Claim
35 words
The invention of claim 1 including a cylinder and piston unit having one end connected with said pivotal connection on said push frame and its opposite end connected with an arm of said lazy tongs.
Claim 6
Dependent Claim
32 words
The invention of claim 1 including pallet clamp means on the lower end of said push frame for pulling a sheEtlike pallet onto said load carriages when said push frame is retracted.
Claim 7
Dependent Claim
183 words
In a lift truck having a load carriage mounted for vertical movement on a mast, a push frame for pushing a load off said carriage, a pair of lazy tongs on opposite sides of said carriage for operating said push frame, each of said lazy tongs having four arms connected together in pairs on offset pivots causing pairs of the arms to lie flat against each other in a common transverse plane of contact parallel with said mast, one of said arms being pivotally connected to a lower portion of said push frame and another of said arms being movable in a vertical guide above said pivotal connection, said last arm consisting of two parts which are adjustable relative to each other to either lengthen or shorten the arm to tilt said push frame either forward or backward in the extended position of the lazy tongs, and a cylinder and piston unit having one end connected with said pivotal connection on said push frame and its opposite end connected with an arm of said lazy tongs for extending and retracting said push frame.
Claim 8
Dependent Claim
183 words
In a lift truck having a load carriage mounted for vertical movement on a mast, a push frame for pushing a load off said carriage, a pair of lazy tongs on opposite sides of said carriage for operating said push frame, each of said lazy tongs having four arms connected together in pairs on offset pivots causing pairs of the arms to lie flat against each other in a common transverse plane of contact parallel with said mast, one of said arms being pivotally connected to a lower portion of said push frame and another of said arms being movable in a vertical guide above said pivotal connection, said last arm consisting of two parts which are adjustable relative to each other to either lengthen or shorten the arm to tilt said push frame either forward or backward in the extended position of the lazy tongs, and a cylinder and piston unit having one end connected with said pivotal connection on said push frame and its opposite end connected with an arm of said lazy tongs for extending and retracting said push frame.
References Cited (Backward Citations)
US2616578A
Cited
US3151755A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |