Patent US3581840A successfully refreshed from Google Patents.
US3581840A
Expired / Lapsed
US
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Hydraulically operable locking mechanism for tilt cab vehicles
Assignee: ORSCHELN BRAKE LEVER Manufacturing Co
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Filing: 1969-10-10
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Granted: 1971-06-01
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Expires: 1989-10-10
Abstract
Abstract Improved hydraulically operable means for locking together the sections of a tilt cab vehicle, characterized by the provision of a jam-responsive means preventing movement of the locking mechanism to the completely locked condition when the cab section is twisted or cocked slightly from the fully seated position relative to the chassis frame. In the preferred embodiment, in addition to the known link means and bellcrank cam means for operating a hook member between fully locked, safety and fully released positions relative to a fixed pin member, a clevis member is provided that is operable when the tilt cab section is improperly oriented relative to the chassis frame for preventing erroneous movement of the spring-biased bellcrank cam means to the fully locked condition.
Inventors
- 👤 Charles M Hirst Jr
- 👤 Eugene C Lipshield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:44
CPC Classifications
B; B62; B62D; B62D33/00; B62D33/06; B62D33/063; B62D33/067; B62D33/07; B62D33/071
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
291 words
In a tilt cab lock assembly for contiguously locking together a pair of housings, including a transverse pin secured to one of said housings; a hook member; link means connecting said hook member with the other one of said housings, said hook member having at one end a hook portion adapted for locking engagement with said pin, said link means being pivotable from a first position in which the hook member is in locked engagement with said pin to a second position in which the hook member is axially displaced to a safety position immediately opposite but spaced from said pin; hook spring means biasing said hook member in the pin-locking direction relative to said link means; and actuator means for initially pivoting said link means from the first position to the second position to axially displace the hook member from the locked position to the safety position, and for subsequently pivoting the hook member relative to said link means from the safety position to a completely released position relative to said pin, said actuator means including a linearly operable actuator member, and bellcrank cam means pivotally connected between said actuator member and that end of said link means that is pivotally connected with said hook member, respectively; and main spring means for biasing said actuator means to pivot said link means toward the first position; the improvement which comprises jam-responsive means operablE to maintain said link means in the second position when the housings are in slightly spaced relation and when the hook member is maintained by engagement with said pin in an intermediate jammed position between the locked and released positions, thereby preventing undesired axial movement of said hook member in the locking direction relative to said second housing.
Claim 2
Dependent Claim
291 words
In a tilt cab lock assembly for contiguously locking together a pair of housings, including a transverse pin secured to one of said housings; a hook member; link means connecting said hook member with the other one of said housings, said hook member having at one end a hook portion adapted for locking engagement with said pin, said link means being pivotable from a first position in which the hook member is in locked engagement with said pin to a second position in which the hook member is axially displaced to a safety position immediately opposite but spaced from said pin; hook spring means biasing said hook member in the pin-locking direction relative to said link means; and actuator means for initially pivoting said link means from the first position to the second position to axially displace the hook member from the locked position to the safety position, and for subsequently pivoting the hook member relative to said link means from the safety position to a completely released position relative to said pin, said actuator means including a linearly operable actuator member, and bellcrank cam means pivotally connected between said actuator member and that end of said link means that is pivotally connected with said hook member, respectively; and main spring means for biasing said actuator means to pivot said link means toward the first position; the improvement which comprises jam-responsive means operablE to maintain said link means in the second position when the housings are in slightly spaced relation and when the hook member is maintained by engagement with said pin in an intermediate jammed position between the locked and released positions, thereby preventing undesired axial movement of said hook member in the locking direction relative to said second housing.
Claim 3
Dependent Claim
55 words
Apparatus as defined in claim 1, and further wherein said actuator means includes an actuator connecting link pivotally connected between said actuator member and said bellcrank, and third spring means biasing the pivotal connection between said cam means and said actuator connecting link in a direction to pivot said link means toward said first position.
Claim 4
Dependent Claim
127 words
Apparatus as defined in claim 2, wherein said link means are pivotally connected at one end with an intermediate portion of said hook member, and further wherein said jam-responsive means includes stop means connected with the pivotal connection between said cam means and said actuator connecting link for engaging the end of the hook member remote from said hook portion to limit the pivotal movement of said hook member in the unlocking direction relative to said link means, whereby owing to the biasing force of said third spring means and the jammed engagement between said pin and the hook portion of said hook member, rolling movement of said bellcrank cam means in a direction causing pivotal movement of said link means toward the first position is prevented.
Claim 5
Dependent Claim
69 words
Apparatus as defined in claim 3, wherein said stop means comprise a U-shaped clevis member the leg portions of which straddle the remote end portion of said hook member and are pivotally connected with the pivotal connection between said actuator connecting link and said cam means, the base portion of said U-shaped clevis member defining a stop surface adapted for engagement by the remote end of said hook member.
Claim 6
Dependent Claim
44 words
Apparatus as defined in claim 4, and further including means for limiting the extent of pivotal movement of said clevis member about its pivotal connection with said actuator connecting link and said cam means relative to the said remote end of said hook member.
Claim 7
Dependent Claim
41 words
Apparatus as defined in claim 5, wherein said limiting means comprise pin and slot means including a pin member extending from the remote end of said hook member through a corresponding slot contained in the base portion of said clevis member.
Claim 8
Dependent Claim
52 words
Apparatus as defined in claim 2, wherein said link means are pivotally connected at one end with an intermediate portion of said hook member, and further wherein said hook spring means comprise tensile spring means connected between the end of said hook member remote from said hook portion and said actuator means.
Claim 9
Dependent Claim
33 words
Apparatus as defined in claim 4, wherein said hook spring means comprises a compression spring arranged between the base portion of said clevis member and the said remote end of said hook member.
Claim 10
Dependent Claim
53 words
Apparatus as defined in claim 2, wherein said actuator member is arranged for reciprocation in an opening contained in said second housing, and further wherein said mainspring means comprise compression spring mans arranged externally of said second housing for cooperation between said second housing and the free end of said actuator member, respectively.
Claim 11
Dependent Claim
35 words
Apparatus as defined in claim 9, wherein said actuator means further includes piston and cylinder hydraulic motor means for displacing said actuator member in the hook-releasing direction against the biasing force of said mainspring means.
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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |