Patent US1934481A successfully refreshed from Google Patents.
Patent US3610672A successfully refreshed from Google Patents.
US3610672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum-operated lift plate rim
Assignee: Cascade Corp
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Filing: 1970-04-23
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Granted: 1971-10-05
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Expires: 1990-04-23
Abstract
Abstract A vacuum-operated lift plate assembly including a curved main plate, an elongate resilient rim extending in a continuous course around the main plate defining a mouth for the lift plate assembly, a shear pad secured to the main plate and a contactoperated valve mounted on the main plate. The rim comprises an outer platform having a resilient facing, adapted to contact an object to be lifted, and a continuous mounting flange connected to the platform by an outwardly inclined wall. A plurality of supporting ribs, spaced at regular intervals on the outside of the rim, interconnect the outer platform, the inclined wall, and the mounting flange. The mounting flange is sealingly retained to the main plate by elongate segments located between the ribs. The segments are secured in position by bolts extending through holes in the segments and the main plate.
Inventors
- 👤 Harlan D Olson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:55
CPC Classifications
B; B66; B66F; B66F9/00; B66F9/06; B66F9/075; B66F9/12; B66F9/18; B66F9/181
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
135 words
A vacuum-operated lift plate assembly including a main plate, a rim extending in a continuous course that defines a mouth of said lift plate assembly, fastening means securing said rim to one side of said plate, said rim comprising a mounting flange, a platform having one sealing side, a wall connecting said mounting flange and said platform with said platform being arranged substantially over said mounting flange on the same side of said wall as said mounting flange with said sealing side facing away from said main plate to contact load objects, a plurality of ribs spaced at intervals around the outside of said rim, each rib connected to the mounting flange and the platform to support the platform and deter inward folding thereof, and means for evacuating the mouth of said lift plate assembly.
Claim 2
Dependent Claim
135 words
A vacuum-operated lift plate assembly including a main plate, a rim extending in a continuous course that defines a mouth of said lift plate assembly, fastening means securing said rim to one side of said plate, said rim comprising a mounting flange, a platform having one sealing side, a wall connecting said mounting flange and said platform with said platform being arranged substantially over said mounting flange on the same side of said wall as said mounting flange with said sealing side facing away from said main plate to contact load objects, a plurality of ribs spaced at intervals around the outside of said rim, each rib connected to the mounting flange and the platform to support the platform and deter inward folding thereof, and means for evacuating the mouth of said lift plate assembly.
Claim 3
Dependent Claim
42 words
A lift plate assembly as described in claim 1, wherein said wall is outwardly inclined with respect to said main plate and said ribs are secured to said wall to support the platform against lateral movement into the mouth of said assembly.
Claim 4
Dependent Claim
37 words
An assembly as described in claim 2, wherein the mounting flange, the wall, and the platform are fabricated of a resilient material and wherein the surface of said platform includes a portion formed of soft resilient rubber.
Claim 5
Dependent Claim
43 words
An assembly as described in claim 1, wherein said fastening means comprise a plurality of elongate washers said washers being positioned adjacent said mounting flange between said ribs, and means for clamping said washers in fixed position with respect to said main plate.
Claim 6
Dependent Claim
192 words
A lift plate assembly including a main plate forming the back of the assembly; a resilient rim extending in a continuous course that defines a mouth of the lift plate assembly; fastening means securing said rim to one side of said main plate; said rim comprising a mounting flange, a platform having at least one sealing side with a strip of soft, resilient, elastomeric material secured thereto, a wall connecting said mounting flange and said platform, said wall being outwardly inclined with respect to said main plate; said platform being arranged substantially over said mounting flange on the same side of said wall as said mounting flange with the strip facing away from the main plate, positioned to contact load objects; a plurality of ribs arranged at intervals around the outside of said rim, said ribs being attached to the platform, the mounting flange, and the wall; said fastening means comprising a plurality of washers, said washers being located adjacent said moUnting flange between said ribs, and means for clamping said washers in fixed position with respect to said main plate; and means for evacuating the mouth of said lift plate assembly.
Claim 7
Dependent Claim
192 words
A lift plate assembly including a main plate forming the back of the assembly; a resilient rim extending in a continuous course that defines a mouth of the lift plate assembly; fastening means securing said rim to one side of said main plate; said rim comprising a mounting flange, a platform having at least one sealing side with a strip of soft, resilient, elastomeric material secured thereto, a wall connecting said mounting flange and said platform, said wall being outwardly inclined with respect to said main plate; said platform being arranged substantially over said mounting flange on the same side of said wall as said mounting flange with the strip facing away from the main plate, positioned to contact load objects; a plurality of ribs arranged at intervals around the outside of said rim, said ribs being attached to the platform, the mounting flange, and the wall; said fastening means comprising a plurality of washers, said washers being located adjacent said moUnting flange between said ribs, and means for clamping said washers in fixed position with respect to said main plate; and means for evacuating the mouth of said lift plate assembly.
References Cited (Backward Citations)
US3291518A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |