US3659733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Narrow aisle attachment
Assignee: Security Pacific Business Credit Inc
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Filing: 1970-12-11
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Granted: 1972-05-02
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Expires: 1990-12-11
Abstract
Abstract An attachment for conventional industrial lift trucks to enable the truck to work in narrow aisles and manipulate pallets in front of and to both sides of the truck, utilizing a crossed sixbar linkage and side shifter mechanism.
Inventors
- 👤 Stuart W Sinclair
- 👤 Monroe J Dennis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:38
CPC Classifications
B; B66; B66F; B66F9/00; B66F9/06; B66F9/075; B66F9/12; B66F9/14; B66F9/147
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
134 words
A narrow-aisle attachment for use with a lift truck, including: a load-support tree, an inner pair of symmetrical arms pivotally attached to the tree, an outer pair of generally symmetrical arms pivotally attached to the ends of the inner arms, the outer arms being overlapped, a front plate pivotally attached to the outer pair of arms, work-engaging means attachable to the plate, the tree, arms and plate comprising a pivoted six-bar linkage, rotating means mechanically interconnecting each of the inner arms and the tree to rotate the arms relative to the tree, latch means selectively interconnecting each of the outer arms to the plate, means for selectively actuating the latch means, side-shifter means supporting the tree for selective shifting of the tree transversely to the truck, and means for selectively actuating the side-shifter means.
Claim 2
Dependent Claim
134 words
A narrow-aisle attachment for use with a lift truck, including: a load-support tree, an inner pair of symmetrical arms pivotally attached to the tree, an outer pair of generally symmetrical arms pivotally attached to the ends of the inner arms, the outer arms being overlapped, a front plate pivotally attached to the outer pair of arms, work-engaging means attachable to the plate, the tree, arms and plate comprising a pivoted six-bar linkage, rotating means mechanically interconnecting each of the inner arms and the tree to rotate the arms relative to the tree, latch means selectively interconnecting each of the outer arms to the plate, means for selectively actuating the latch means, side-shifter means supporting the tree for selective shifting of the tree transversely to the truck, and means for selectively actuating the side-shifter means.
Claim 3
Dependent Claim
21 words
The invention of claim 1, including: equalizer means interconnecting the load support tree and side-shifter means to prevent relative twisting therebetween.
Claim 4
Dependent Claim
23 words
The invention of claim 1 wherein the rotating means includes hydraulic motors pivotally interconnected between the tree and each of the inner arms.
Claim 5
Dependent Claim
12 words
The invention of claim 1 wherein the side-shifter means includes primary means.
Claim 6
Dependent Claim
21 words
The invention of claim 4 wherein the means for selectively actuating the side-shifter means includes telescoping primary and secondary motor means.
Claim 7
Dependent Claim
49 words
The invention of claim 1 wherein the latch means includes locking cams on the plate which engage catches on the outer arms, and wherein the means for selectively actuating the latch means includes cam-locking fingers which engage the locking cams at selective positions of actuaTion of the side-shifter means.
Claim 8
Dependent Claim
145 words
The improvement in a six-bar linkage type narrow-aisle attachment for use with an industrial truck having a side-shifting mechanism, the improvement providing 90* rotation of the work-engaging means to both sides of the truck, including: a load-supporting tree operatively attached to the side-shifting mechanism, the tree providing one link in the six-bar linkage, an inner pair of symmetrical arms pivotally connected to the tree and providing two links in the six-bar linkage, an outer pair of generally symmetrical arms, one each pivotally connected to each inner arm and providing two links in the six-bar linkage, a work-engaging means providing a link in the six-bar linkage, the outer pair of arms being overlapped and pivotally connected with the work-engaging means, latch means selectively locking each of the outer arms to the work-engaging means, means for selectively unlocking the latch means, and means for pivoting the links.
Claim 9
Dependent Claim
145 words
The improvement in a six-bar linkage type narrow-aisle attachment for use with an industrial truck having a side-shifting mechanism, the improvement providing 90* rotation of the work-engaging means to both sides of the truck, including: a load-supporting tree operatively attached to the side-shifting mechanism, the tree providing one link in the six-bar linkage, an inner pair of symmetrical arms pivotally connected to the tree and providing two links in the six-bar linkage, an outer pair of generally symmetrical arms, one each pivotally connected to each inner arm and providing two links in the six-bar linkage, a work-engaging means providing a link in the six-bar linkage, the outer pair of arms being overlapped and pivotally connected with the work-engaging means, latch means selectively locking each of the outer arms to the work-engaging means, means for selectively unlocking the latch means, and means for pivoting the links.
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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |