US3814456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fork lift truck
Assignee: Bygg Och Transportekonomi BT AB
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Filing: 1972-11-17
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Granted: 1974-06-04
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Expires: 1992-11-17
Abstract
Abstract In a height-adjustable fork lift truck, or the like, having a forwardly projecting portion supported on rolling means, means is provided for selectively raising and lowering the forwardly projecting portion of the truck relative to the rolling means, the raising and lowering means including a fork arm carrying a rolling means and being pivotally connected to the forwardly projecting portion of the frame. A motion-transmitting mechanism is coupled to the frame and is pivotally connected to the fork arm via a second pivot means in order to impart rotation to the fork arm in a direction dependent upon the direction of motion of the frame of the truck relative to its support wheels in order to thereby correspondingly lift or lower the forwardly projecting portion of the frame. Each of the pivot means connecting the fork arm to the forwardly projecting portion and to the motiontransmitting mechanism comprises respective multiple-shear pivot junctions in order to improve the structural strength characteristics of the truck.
Inventors
- 👤 A Bryntse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:17
CPC Classifications
B; B62; B62B; B62B3/00; B62B3/04; B62B3/06; B62B3/0618; B62B3/0625; Y; Y10; Y10T; Y10T403/00; Y10T403/32; Y10T403/32606; Y10T403/32951
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
251 words
An elevating lift truck, or the like, comprising: a frame (8) mounted on wheels (3), said frame (8) having a forwardly projecting portion (7) supported on rolling means (17); means (1,2) for selectively moving said frame (8) upwardly and downwardly relative to said wheels (3); and means for selectively raising and lowering said forwardly projecting portion (7) of said frame (8) relative to said rolling means (17), said raising and lowering means including: a fork arm (14) carrying at least one rolling means (17) at one portion thereof; first pivot means (13) for pivotally connecting a second portion of said fork arm (14) to said forwardly projecting portion (7) of said frame (8); and a motion-transmitting mechanism (5,6,9,10,11,12) coupled to said frame (8) and pivotally connected (12) to said fork arm (14) via a second pivot means (12), said motion-transmitting mechanism imparting pivotal motion to said fork arm (14) about said first pivot means (13) in a direction dependent upon the direction of motion of said frame (8) relative to said wheels (3) in order to thereby correspondingly lift or lower said forwardly projecting portion (7); said first and second pivot means (12,13) each comprising respective multiple-shear pivot junctions, each multiple-shear pivot junction including: a pair of pivot elements, each pivot element comprising at least two extending elements (19,22) which are interleaved with the at least two extending elements of the other of its respective pair of pivot elements; and a pivot shaft passing through each of said interleaved extending elements.
Claim 2
Dependent Claim
251 words
An elevating lift truck, or the like, comprising: a frame (8) mounted on wheels (3), said frame (8) having a forwardly projecting portion (7) supported on rolling means (17); means (1,2) for selectively moving said frame (8) upwardly and downwardly relative to said wheels (3); and means for selectively raising and lowering said forwardly projecting portion (7) of said frame (8) relative to said rolling means (17), said raising and lowering means including: a fork arm (14) carrying at least one rolling means (17) at one portion thereof; first pivot means (13) for pivotally connecting a second portion of said fork arm (14) to said forwardly projecting portion (7) of said frame (8); and a motion-transmitting mechanism (5,6,9,10,11,12) coupled to said frame (8) and pivotally connected (12) to said fork arm (14) via a second pivot means (12), said motion-transmitting mechanism imparting pivotal motion to said fork arm (14) about said first pivot means (13) in a direction dependent upon the direction of motion of said frame (8) relative to said wheels (3) in order to thereby correspondingly lift or lower said forwardly projecting portion (7); said first and second pivot means (12,13) each comprising respective multiple-shear pivot junctions, each multiple-shear pivot junction including: a pair of pivot elements, each pivot element comprising at least two extending elements (19,22) which are interleaved with the at least two extending elements of the other of its respective pair of pivot elements; and a pivot shaft passing through each of said interleaved extending elements.
Claim 3
Dependent Claim
37 words
A truck according to claim 1 wherein said fork arm carries said at least one rolling means at one end portion thereof, and said first and second pivot means are located at the other end portion thereof.
Claim 4
Dependent Claim
19 words
A truck according to claim 2 wherein said first pivot means is located vertically below said second pivot means.
Claim 5
Dependent Claim
19 words
A truck according to claim 2 wherein said second pivot means is located vertically below said first pivot means.
Claim 6
Dependent Claim
24 words
A truck according to claim 1 wherein said at least one rolling means is pivotally connected to said one portion of said fork arm.
Claim 7
Dependent Claim
38 words
A truck according to claim 1 wherein said at least one rolling means comprises a pair of rolling elements mounted on a frame structure, said frame structure being pivotally connected to said one portion of said fork arm.
Claim 8
Dependent Claim
19 words
A truck according to claim 1 wherein said forwardly projecting portion is an elongated, forwardly extending, fork lift element.
Claim 9
Dependent Claim
65 words
A truck according to claim 1 wherein said forwardly extending portion comprises a pair of elongated, separated, forwardly projecting fork lift elements, each of which is supported on respective rolling means, and each of which comprises respective means for selectively raising and lowering said fork lift elements relative to said respective rolling means, each of said raising and lowering means comprising said multiple-shear pivot junctions.
Claim 10
Dependent Claim
39 words
A truck according to claim 1 wherein each of said pivot elements comprises at least three extending elements (19,22) which are interleaved with the at least three extending elements to the other of its respective pair of pivot elements.
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) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |