Patent US3740020A successfully refreshed from Google Patents.
US3740020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lift beam retaining means
Assignee: McNeil Corp
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Filing: 1971-06-11
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Granted: 1973-06-19
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Expires: 1991-06-11
Abstract
Abstract A lifting beam for a jack of the one end lift type has slidable end sections and a latch arrangement for holding them in place to prevent accidental removal.
Inventors
- 👤 L Arnes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:25
CPC Classifications
B; B66; B66F; B66F13/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
119 words
A lifting jack comprising a column, a carriage supported on the column for vertical movement, said carriage including a fixed horizontal tubular beam section having opposite open ends, movable end beam sections telescoped respectively inside of the opposite ends of said fixed beam section and extending through said open ends, and latch means for interconnecting the movable sections and the fixed sections and operative to prevent movement of the movable sections out of said open ends, said latch means comprising a movable latch element mounted in said fixed beam section and fixed latch elements mounted in said movable beam sections, said movable element comprising a plate having hooks thereon and said fixed elements comprising pins engaged by the hooks.
Claim 2
Dependent Claim
119 words
A lifting jack comprising a column, a carriage supported on the column for vertical movement, said carriage including a fixed horizontal tubular beam section having opposite open ends, movable end beam sections telescoped respectively inside of the opposite ends of said fixed beam section and extending through said open ends, and latch means for interconnecting the movable sections and the fixed sections and operative to prevent movement of the movable sections out of said open ends, said latch means comprising a movable latch element mounted in said fixed beam section and fixed latch elements mounted in said movable beam sections, said movable element comprising a plate having hooks thereon and said fixed elements comprising pins engaged by the hooks.
Claim 3
Dependent Claim
20 words
A lifting jack as set forth in claim 1 wherein said pins are horizontally mounted in said movable beam sections.
Claim 4
Dependent Claim
28 words
A lifting jack as set forth in claim 2 wherein the latch plate is mounted so that the weight thereof holds it in engagement with said latch pins.
Claim 5
Dependent Claim
23 words
A lifting jack as set forth in claim 3 including a guide pin for said latch plate supported in said fixed beam section.
Claim 6
Dependent Claim
23 words
A lifting jack as set forth in claim 4 wherein said guide pin is fixed to the latch plate and movable with it.
Claim 7
Dependent Claim
48 words
A lifting jack as set forth in claim 5 wherein said fixed beam section has an opening in the bottom thereof, said guide pin slidably extending through said bottom opening and being accessible outside the beam section to provide a means for manually lifting and disconnecting the latch.
Claim 8
Dependent Claim
38 words
A lifting jack as set forth in claim 6 wherein said fixed beam section has an opening in the top thereof in alignment with said opening in the bottom, said guide pin slidably extending through said top opening.
Claim 9
Dependent Claim
86 words
A lifting jack comprising a column, a carriage supported on the column for vertical movement, said carriage including a fixed horizontal tubular beam section having opposite open ends, movable end beam sections telescoped respectively inside of the opposite ends of said fixeD beam section and extending through said open ends, and movable common latch plate means extending between and directly interconnecting the movable sections to each other and to the fixed sections and operative to prevent movement of the movable sections out of said open ends.
Claim 10
Dependent Claim
86 words
A lifting jack comprising a column, a carriage supported on the column for vertical movement, said carriage including a fixed horizontal tubular beam section having opposite open ends, movable end beam sections telescoped respectively inside of the opposite ends of said fixeD beam section and extending through said open ends, and movable common latch plate means extending between and directly interconnecting the movable sections to each other and to the fixed sections and operative to prevent movement of the movable sections out of said open ends.
Claim 11
Dependent Claim
29 words
A jack as set forth in claim 8 wherein said latch means is constructed and arranged so that the force of gravity holds the latch means in latched condition.
Claim 12
Dependent Claim
106 words
A lifting jack comprising a column, a carriage supported on the column for vertical movement, said carriage including a fixed beam section having an end, a movable end beam section slidably mounted on said end and having a latch pin, and a movable latch member engageable with the latch pin for connecting the movable section to the end section and operative to prevent separation of the sections, yieldable means urging the latch member to latching position, and guide means movably connecting the latch member to the fixed beam section for guided movement transverse to the direction of sliding of the movable section in the fixed section.
Claim 13
Dependent Claim
106 words
A lifting jack comprising a column, a carriage supported on the column for vertical movement, said carriage including a fixed beam section having an end, a movable end beam section slidably mounted on said end and having a latch pin, and a movable latch member engageable with the latch pin for connecting the movable section to the end section and operative to prevent separation of the sections, yieldable means urging the latch member to latching position, and guide means movably connecting the latch member to the fixed beam section for guided movement transverse to the direction of sliding of the movable section in the fixed section.
Claim 14
Dependent Claim
40 words
A jack as set forth in claim 10 wherein the latch member and the latch pin are mounted so that the weight of the latch member provides said yieldable means and holds it in latching engagement with the latch pin.
Claim 15
Dependent Claim
46 words
A jack as set forth in claim 11 wherein said latch member comprises the only obstruction to removal of the movable sections from the fixed section so that upon overcoming the weight of the latch member the movable member may be removed from the fixed member.
Claim 16
Dependent Claim
44 words
A jack as set forth in claim 10 wherein said latch member comprises the only obstruction to removal of the movable section from the fixed section so that when the member is in unlatched position the movable section is removable from the fixed section.
Claim 17
Dependent Claim
34 words
A jack as set forth in claim 10 wherein said guide means comprises a guide pin fixed to the latch member, said fixed beam section having hole means therein slidably receiving the guide pin.
Claim 18
Dependent Claim
19 words
A jack as set forth in claim 14 wherein said yieldable means comprises the weight of said latch member.
References Cited (Backward Citations)
US2867409A
Cited
US3302927A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |