US3646830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable ratio lever mechanism
Assignee: Individual
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Filing: 1970-06-01
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Granted: 1972-03-07
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Expires: 1990-06-01
Abstract
Abstract A variable ratio lever mechanism adaptable for use as a parking brake control pedal assembly. The mechanism includes a control lever pivotally connected to a support structure by a pair of links. The pivotal connections between the lever and first link and between the support structure and the second link have a common first axis; the pivotal connections between the lever and the second link and between the support structure and the first link have a common second axis. The mechanism provides a lesser mechanical advantage during initial application of the parking brake and a greater mechanical advantage following initial application.
Inventors
- 👤 Larry R Shrock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:12
CPC Classifications
B; B60; B60T; B60T11/00; B60T11/04; B60T11/08; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20558
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
131 words
A position responsive variable ratio lever assembly comprising a support member, a first link and first pivot means connecting said first link to said support member to pivot about a first axis, a second link and second pivot means connecting said second link to said support member to pivot about a second axis, a lever member connected to said first and second links and having a force applying portion and a fixed point thereon adapted to be connected to a load, said lever member being constructed to pivot about said first axis only during one portion of its displacement and about said second axis only during the remaining portion of its displacement, the mechanical advantage of said lever being greater during pivotal movement about one of said axes than the other.
Claim 2
Dependent Claim
131 words
A position responsive variable ratio lever assembly comprising a support member, a first link and first pivot means connecting said first link to said support member to pivot about a first axis, a second link and second pivot means connecting said second link to said support member to pivot about a second axis, a lever member connected to said first and second links and having a force applying portion and a fixed point thereon adapted to be connected to a load, said lever member being constructed to pivot about said first axis only during one portion of its displacement and about said second axis only during the remaining portion of its displacement, the mechanical advantage of said lever being greater during pivotal movement about one of said axes than the other.
Claim 3
Dependent Claim
132 words
A lever assembly comprising a first support means, a second support means spaced from said first support means being fixed in position relative thereto, a first axis intersecting said first support means, a second axis intersecting said second support means, said second axis being spaced from and substantIally parallel to said first axis, a first link connected to said first support means to pivot about said first axis, a second link connected to said second support means to pivot about said second axis, a third link having a first pivotal connection with said second link alignable with said first axis and a second pivotal connection with said first link alignable with said second axis, said third link including a lever member constructed to transmit a force from one portion thereof to another.
Claim 4
Dependent Claim
132 words
A lever assembly comprising a first support means, a second support means spaced from said first support means being fixed in position relative thereto, a first axis intersecting said first support means, a second axis intersecting said second support means, said second axis being spaced from and substantIally parallel to said first axis, a first link connected to said first support means to pivot about said first axis, a second link connected to said second support means to pivot about said second axis, a third link having a first pivotal connection with said second link alignable with said first axis and a second pivotal connection with said first link alignable with said second axis, said third link including a lever member constructed to transmit a force from one portion thereof to another.
Claim 5
Dependent Claim
72 words
A lever assembly according to claim 2 and including: stop means precluding movement of said third link about said second axis and permitting pivotal movement of said third link about said first axis during one portion of lever travel, said stop means also precluding pivotal movement of said third link about said first axis and permitting pivotal movement of said third link about said second axis during another portion of lever travel.
Claim 6
Dependent Claim
23 words
A lever assembly according to claim 2 and including: said lever member comprising a depending pedal for control of an automobile parking brake.
Claim 7
Dependent Claim
23 words
A lever assembly according to claim 3 and including: said lever member comprising a depending pedal for control of an automobile parking brake.
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) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |