US3558094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle seat having optimum angular motion characteristics
Assignee: Bostrom Seating Inc
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Filing: 1969-07-16
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Granted: 1971-01-26
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Expires: 1989-07-16
Abstract
Abstract A seat having a cushion part, a base part, a spring means biasing the cushion part vertically away from the base part, guides restraining the relative movement of the cushion with respect to the base in both lateral and fore and aft directions, and forward and rear shock absorbers divided into upper and lower compartments by pistons and respectively connected to the forward and rear portions of the cushion part. The upper surface area of the piston of the rear shock absorber is equal to the area of the lower surface of the piston of the forward shock absorber multiplied by the ratio of the respective distances from the knee point of a seat occupant to the front portion of the cushion part and from the knee point of a seat occupant to the rear portion of the cushion part. A connection tube joins the lower compartment of the forward shock absorber and the upper compartment of the rear shock absorber.
Inventors
- 👤 Arthur O Radke
- 👤 Donald J Zach
- 👤 Garth O Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:00
CPC Classifications
B; B60; B60N; B60N2/00; B60N2/50; B60N2/502; B60N2/505; B60N2/52; B60N2/525; B60N2/527
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
248 words
A seat comprising: a. a cushion part having front and rear portions; b. a base part; c. a spring means biasing said cushion part vertically away from said base part; d. guides that restrain movement of said cushion part with respect to said base part in lateral and fore and aft directions; e. a first forward shock absorber connecting said front portion of said cushion part to said base part and comprising a piston which divides a cylinder into upper and lower compartments; f. a first rear shock absorber connecting said rear portion of said cushion part to said base part and comprising a piston which divides a cylinder into upper and lower compartments, and the area of the upper surface of said rear piston is equal to the area of the lower surface of said forward piston multiplied by the ratio of the respective distances from a point ahead of the front edge of said cushion part generally in the area of the knee of a seat occupant to the front portion of said cushion part, and from the same knee point to the rear portion of said cushion part; and g. a first connection tube between said lower compartment of said forward shock absorber and said upper compartment of said rear shock absorber, whereby both of said portions of said cushion part move at substantially the same angular velocity about the aforesaid knee point during oscillation of said cushion part with respect to said base part.
Claim 2
Dependent Claim
248 words
A seat comprising: a. a cushion part having front and rear portions; b. a base part; c. a spring means biasing said cushion part vertically away from said base part; d. guides that restrain movement of said cushion part with respect to said base part in lateral and fore and aft directions; e. a first forward shock absorber connecting said front portion of said cushion part to said base part and comprising a piston which divides a cylinder into upper and lower compartments; f. a first rear shock absorber connecting said rear portion of said cushion part to said base part and comprising a piston which divides a cylinder into upper and lower compartments, and the area of the upper surface of said rear piston is equal to the area of the lower surface of said forward piston multiplied by the ratio of the respective distances from a point ahead of the front edge of said cushion part generally in the area of the knee of a seat occupant to the front portion of said cushion part, and from the same knee point to the rear portion of said cushion part; and g. a first connection tube between said lower compartment of said forward shock absorber and said upper compartment of said rear shock absorber, whereby both of said portions of said cushion part move at substantially the same angular velocity about the aforesaid knee point during oscillation of said cushion part with respect to said base part.
Claim 3
Dependent Claim
40 words
The seat of claim 1 further characterized in that said upper compartments of said shock absorbers surround the piston shafts and said lower compartments of said shock absorbers are on the opposite sides of said pistons from said piston shafts.
Claim 4
Dependent Claim
143 words
The seat of claim 2 further characterized in that a second rear shock absorber connects said rear portion of said cushion part to said base part and comprises a piston which divides a cylinder into upper and lower compartments, both of said rear shock absorbers are positioned laterally opposite each other beneath said cushion part, and the area of the lower surface of said piston of said first rear shock absorber equals the area of the upper surface of said piston of said second rear shock absorber, and a second connection tube joins the lower compartment of said first rear shock absorber to the upper compartment of said second rear shock absorber, and a third connection tube connects the lower compartment of said second rear shock absorber to an airtight hydraulic fluid accumulator precharged with hydraulic fluid and with a quantity of gas.
Claim 5
Dependent Claim
39 words
The seat of claim 3 further characterized in that there is a valve in said second connection tube whereby hydraulic fluid can be added or withdrawn, thereby changing the relative levels of said pistons within said forward shock absorbers.
Claim 6
Dependent Claim
38 words
The seat of claim 2 further characterized in that a second connection tube connects the lower compartment of said rear shock absorber to an airtight hydraulic fluid accumulator precharged with hydraulic fluid and with a quantity of gas.
Claim 7
Dependent Claim
112 words
The seat of claim 5 further characterized in that a second forward shock absorber connects said front portion of said cushion part to said base part and comprises a piston which divides a cylinder into upper and lower compartments, both of said forward shock absorbers are positioned laterally opposite each other beneath said cushion part; and the area of the lower surface of said piston of said second forward shock absorber equals the area of the upper surface of said piston of said first forward shock absorber, and a third connection tube joins the lower compartment of said second forward shock absorber to the upper compartment of said first forward shock absorber.
Claim 8
Dependent Claim
39 words
The seat of claim 6 further characterized in that there is a valve in said third connection tube whereby hydraulic fluid can be added or withdrawn thereby changing the relative levels of said pistons within said forward shock absorbers.
Claim 9
Dependent Claim
25 words
The seat of claim 5 further characterized in that there is a valve in said accumulator through which hydraulic fluid may be injected or withdrawn.
Claim 10
Dependent Claim
148 words
The seat of claim 8 further characterized in that there is a shunt means dividing said first connection tube into upper and lower segments, and a third connection tube divided by said shunt Means into an upper segment connecting the upper compartment of said forward shock absorber to said shunt means and a lower segment connecting the lower compartment of said rear shock absorber to said shunt means, and said shunt means in a first position provides a passageway between said upper and lower segments of said first connection tube and a separate passageway between said upper and lower segments of said third connection tube, and in a second position said shunt means provides a passageway interconnecting said upper segments of said first and third connection tubes and said lower segment of said first connection tube and blocks flow in said lower segment of said third connection tube.
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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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |