Patent US5467855A successfully refreshed from Google Patents.
US5467855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ramp weight-reducing assembly
Assignee: Assa Abloy Residential Group Inc
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Filing: 1994-06-29
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Granted: 1995-11-21
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Expires: 2014-06-29
Abstract
Abstract A ramp weight-reducing assembly which reduces the weight of a ramp manually lifted up to the working surface of a vehicle bed by an operator to then couple the ramp with the bed to maintain the ramp in load-bearing position. The assembly is simple in design, easy to manufacture and low in cost which will allow the manufacturer to offer the assembly to the majority of ramp users at a minimal price. The ramp weight-reducing assembly includes a ramp and a ramp connector, modified to accept a weight-reducing spring assembly between the ramp and ramp connector legs. The spring assembly includes a piston rod coupled to the ramp having a stop, inserted into a main compression spring which is then inserted into a hole in a support bar that spans the two connector legs running parallel to each other. The spring assembly also includes two supplemental springs attached to plates between the ramp and ramp connector. The springs cooperate to reduce the weight lifted by an operator raising or lowering the ramp.
Inventors
- 👤 Birk C. Sorensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:38
CPC Classifications
B; B60; B60P; B60P1/00; B60P1/43; B60P1/431
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
140 words
A ramp weight-reducing assembly for use with a front portion of a ramp having a predetermined weight to reduce the weight manually lifted by an operator raising said front portion to a working surface, said weight-reducing ramp assembly comprising: a ramp connector pivotally connected to said ramp; weight reducing means for reducing the weight lifted by an operator when raising said from portion of said ramp, by applying a biasing force to the ramp and connected between said ramp and ramp connector; engaging means for connecting said front portion of said ramp to said working surface; whereby said weight reducing means opposes the force of said predetermined weight of said ramp by applying said biasing force before and during a period when said operator manually lifts said ramp and engages said front portion of said ramp with said working surface.
Claim 2
Dependent Claim
140 words
A ramp weight-reducing assembly for use with a front portion of a ramp having a predetermined weight to reduce the weight manually lifted by an operator raising said front portion to a working surface, said weight-reducing ramp assembly comprising: a ramp connector pivotally connected to said ramp; weight reducing means for reducing the weight lifted by an operator when raising said from portion of said ramp, by applying a biasing force to the ramp and connected between said ramp and ramp connector; engaging means for connecting said front portion of said ramp to said working surface; whereby said weight reducing means opposes the force of said predetermined weight of said ramp by applying said biasing force before and during a period when said operator manually lifts said ramp and engages said front portion of said ramp with said working surface.
Claim 3
Dependent Claim
100 words
The ramp weight reducing assembly of claim 1 wherein said weight reducing means includes a support bar rotatably connected to said ramp connector formed with a bore traversing a longitudinal axis of said support bar; a piston rod having a top end pivotally connected to said ramp and a bottom end telescopically traversing said bore; a stop located proximate to the piston rod top end; a main spring maintained concentrically about the longitudinal axis of said piston rod between said stop and said support bar whereby said main spring applies a biasing force between said stop and said support bar.
Claim 4
Dependent Claim
56 words
The ramp weight-reducing assembly of claim 1 wherein: each of said respective supplemental springs includes a first end connected to said ramp connector and a second end extending towards said ramp such that during said initial lifting period said second end engages said ramp and applies said biasing force between said ramp connector and said ramp.
Claim 5
Dependent Claim
57 words
The ramp weight-reducing assembly of claim 1 wherein: each of said respective supplemental springs includes a first end connected to said ramp and a second end extending towards said ramp connector such that during said initial lifting period, said second end engages said ramp connector and applies said biasing force between said ramp connector and said ramp.
Claim 6
Dependent Claim
33 words
The ramp weight-reducing assembly of claim 2 wherein said main spring is rotatable between a stored position parallel with said ramp and an operational position to oppose the force of the ramp weight.
Claim 7
Dependent Claim
62 words
The ramp weight-reducing assembly of claim 1 wherein said engaging means includes hooks connected on the end of said front portion of said ramp, hook receiving apertures formed in said working surface and said front portion of said ramp having a weight greater than the biasing force of weight reducing means to maintain said hooks in overlying engagement with said hook apertures.
Claim 8
Dependent Claim
67 words
The weight-reducing assembly of claim 1 wherein said weight reducing means includes respective supplemental springs, each positioned between said front portion of said ramp and said ramp connector, such that said respective supplemental springs apply said biasing force throughout an initial period when said ramp and said ramp connector are in a generally parallel position to reduce the weight of said ramp manually lifted by said operator.
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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) | 1998-11-20 | 1999-05-22 | 1999-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-11-20 | 2003-05-22 | 2003-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-11-20 | 2007-05-22 | 2007-11-21 | $7700.00 | Window Closed / Lapsed |