US3589541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Load handling in forklift trucks
Assignee: Individual
•
Filing: 1969-02-20
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Granted: 1971-06-29
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Expires: 1989-02-20
Abstract
Abstract A slope-piling arrangement for a forklift truck in which one of the lifting forks has its vertical leg movably engaged with the fork apron so that the fork leg, during movement relative to the apron, is constrained to move vertically, and in which a power drive mechanism is connected between the apron and the fork for moving the fork relative to the apron.
Inventors
- 👤 Thomas N Melin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:33
CPC Classifications
B; B66; B66F; B66F9/00; B66F9/06; B66F9/075; B66F9/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
219 words
Slope-piling apparatus for a forklift truck having a fork apron extending transversely of the length of the truck and a pair of load-bearing forks carried by the apron and extending forwardly of the chassis from the apron in spaced relation to each other, each of the forks having a vertical leg and a horizontal leg, the slope-piling apparatus comprising means mounting the vertical legs of the forks to the apron for guided movement vertically relative to each other including a substantially horizontal elongate hanger bar for each fork aligned substantially perpendicular to the fork horizontal legs and fixed to the upper end of the vertical leg of the corresponding fork adjacent the end of the bar opposite from the other fork, means pivotally mounting the other end of each bar to the apron, linkage means coupled between the hanger bars remote from said pivotally mounting means arranged to cause one fork to move vertically relative to the apron in response to vertical movement of the other fork relative to the apron an equal amount in the opposite direction, and controllable power means connected between the apron and the linkage means for moving the linkage means in such manner as to move the hanger bars equally and to move the forks equally vertically in opposite directions relative to the apron.
Claim 2
Dependent Claim
219 words
Slope-piling apparatus for a forklift truck having a fork apron extending transversely of the length of the truck and a pair of load-bearing forks carried by the apron and extending forwardly of the chassis from the apron in spaced relation to each other, each of the forks having a vertical leg and a horizontal leg, the slope-piling apparatus comprising means mounting the vertical legs of the forks to the apron for guided movement vertically relative to each other including a substantially horizontal elongate hanger bar for each fork aligned substantially perpendicular to the fork horizontal legs and fixed to the upper end of the vertical leg of the corresponding fork adjacent the end of the bar opposite from the other fork, means pivotally mounting the other end of each bar to the apron, linkage means coupled between the hanger bars remote from said pivotally mounting means arranged to cause one fork to move vertically relative to the apron in response to vertical movement of the other fork relative to the apron an equal amount in the opposite direction, and controllable power means connected between the apron and the linkage means for moving the linkage means in such manner as to move the hanger bars equally and to move the forks equally vertically in opposite directions relative to the apron.
Claim 3
Dependent Claim
205 words
Slope-piling apparatus for a forklift truck having a fork apron extending transversely of the length of the truck and a pair of load bearing forks carried by the apron and extending forwardly of the chassis from the apron in spaced relation to each other, at least one of the forks having a vertical leg which is movable relative to the apron, the slope-piling apparatus comprising means mounting the vertical leg of the one fork to the apron for guided movement vertically relative to the other fork including a substantially horizontal elongate hanger bar for the one fork connected at one end thereof to the upper end of the vertical leg of the one fork, means pivotally mounting the other end of the hanger bar to the apron at a location on the apron between the forks, linkage means coupled to the hanger bar remote from said pivotally mounting means arranged to cause the one fork to move vertically relative to the apron, and controllable power means connected between the apron and the linkage means for moving the linkage means in such manner as to pivotally move the hanger bar to move the one fork vertically in relation to the apron and to the other fork.
Claim 4
Dependent Claim
205 words
Slope-piling apparatus for a forklift truck having a fork apron extending transversely of the length of the truck and a pair of load bearing forks carried by the apron and extending forwardly of the chassis from the apron in spaced relation to each other, at least one of the forks having a vertical leg which is movable relative to the apron, the slope-piling apparatus comprising means mounting the vertical leg of the one fork to the apron for guided movement vertically relative to the other fork including a substantially horizontal elongate hanger bar for the one fork connected at one end thereof to the upper end of the vertical leg of the one fork, means pivotally mounting the other end of the hanger bar to the apron at a location on the apron between the forks, linkage means coupled to the hanger bar remote from said pivotally mounting means arranged to cause the one fork to move vertically relative to the apron, and controllable power means connected between the apron and the linkage means for moving the linkage means in such manner as to pivotally move the hanger bar to move the one fork vertically in relation to the apron and to the other fork.
Claim 5
Dependent Claim
190 words
Slope-piling apparatus for a forklift truck having a fork apron extending transversely of the length of the truck and a pair of load-bearing forks carried by the apron and extending forwardly of the chassis from the apron in spaced relation to each other, each of the forks having a vertical leg and a horizontal leg, the slope-piling apparatus comprising means mounting the vertical legs of the forks to the apron for guided movement vertically relative to each other including substantially horizontal elongate hanger bar means for the forks aligned transversely of the apron substantially perpendicular to the fork horizontal legs and at its opposite ends to the upper end of the vertical leg of the corresponding fork, means pivotally mounting the hanger bar means to the apron between the fork vertical legs, linkage means coupled to the hanger bar means remote from said pivotally mounting means arranged to cause the forks to move vertically relative to the apron in opposite directions, and controllable power means connected between the apron and the linkage means for moving the linkage means to move the forks vertically in opposite directions relative to the apron.
Claim 6
Dependent Claim
190 words
Slope-piling apparatus for a forklift truck having a fork apron extending transversely of the length of the truck and a pair of load-bearing forks carried by the apron and extending forwardly of the chassis from the apron in spaced relation to each other, each of the forks having a vertical leg and a horizontal leg, the slope-piling apparatus comprising means mounting the vertical legs of the forks to the apron for guided movement vertically relative to each other including substantially horizontal elongate hanger bar means for the forks aligned transversely of the apron substantially perpendicular to the fork horizontal legs and at its opposite ends to the upper end of the vertical leg of the corresponding fork, means pivotally mounting the hanger bar means to the apron between the fork vertical legs, linkage means coupled to the hanger bar means remote from said pivotally mounting means arranged to cause the forks to move vertically relative to the apron in opposite directions, and controllable power means connected between the apron and the linkage means for moving the linkage means to move the forks vertically in opposite directions relative to the apron.
Claim 7
Dependent Claim
159 words
Slope-piling apparatus for a forklift truck having a fork apron extending transversely of the length of the truck and a pair of load-bearing forks carried by the apron and extending forwardly of the chassis from the apron in spaced relation to each other, at least one of the forks having a vertical leg which is movable relative to the apron, the slope-piling apparatus comprising means mounting the vertical leg of the one fork to the apron for guided movement vertically relative to the other fork, linkage means coupled to the vertical leg of the one fork and operable to move the one fork vertically relative to the apron, and controllable linear motion power means disposed at the top of the apron with the line of action thereof oriented substantially horizontal and connected between the apron and the linkage means for operating the linkage means to move the one fork vertically relative to the apron and to the other fork.
Claim 8
Dependent Claim
159 words
Slope-piling apparatus for a forklift truck having a fork apron extending transversely of the length of the truck and a pair of load-bearing forks carried by the apron and extending forwardly of the chassis from the apron in spaced relation to each other, at least one of the forks having a vertical leg which is movable relative to the apron, the slope-piling apparatus comprising means mounting the vertical leg of the one fork to the apron for guided movement vertically relative to the other fork, linkage means coupled to the vertical leg of the one fork and operable to move the one fork vertically relative to the apron, and controllable linear motion power means disposed at the top of the apron with the line of action thereof oriented substantially horizontal and connected between the apron and the linkage means for operating the linkage means to move the one fork vertically relative to the apron and to the other fork.
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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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |