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US4058009A
Expired / Lapsed
US
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Arrangement for monitoring pneumatic tire inflation pressure
Assignee: Individual
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Filing: 1975-08-28
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Granted: 1977-11-15
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Expires: 1995-08-28
Abstract
Abstract A cylinder accommodates an elongated bellows tube one end of which is connected to the cylinder and another end of which has a piston sealingly mounted in it so that the piston can move with the bellows tube during expansion and contraction of the latter. The piston in part bounds a pressure chamber in the cylinder outside the bellows tube and is urged to a position in which it closes the chamber. Channels communicate the chamber with one or more tires so that the piston is subject to the inflation pressure of the tire and shifts in the cylinder under concomitant change in the axial length of the bellows tube when changes in the tire inflation pressure occur.
Inventors
- 👤 Hansruedi Etter-Felix
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:56
CPC Classifications
B; B60; B60C; B60C23/00; B60C23/005; B60C23/007; B60C23/02; B60C23/04; B60C23/0408; B60C23/0422; B60C23/0433; Y; Y10; Y10T; Y10T137/00; Y10T137/3584; Y10T137/3662
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
154 words
An arrangement for monitoring pneumatic tire inflation pressure, comprising a cylinder; an elongated bellows tube in said cylinder and having an end connected thereto and another end; a piston sealingly mounted in said other end and movable with said bellows tube during expansion and contraction of the same, said piston in part bounding a pressure chamber outside said bellows tube; and channel means for communicating said pressure chamber with a tire so that the piston is subject to the inflation pressure in the tire and shifts in said cylinder under concomittant change in the axial length of said bellows tube, in response to changes in the inflation pressure, said channel means including at least two channels each adapted to communicate with a different tire and each having an opening communicating with said pressure chamber, and said piston being movable to and from a position in which it blocks at least one of said openings.
Claim 2
Dependent Claim
154 words
An arrangement for monitoring pneumatic tire inflation pressure, comprising a cylinder; an elongated bellows tube in said cylinder and having an end connected thereto and another end; a piston sealingly mounted in said other end and movable with said bellows tube during expansion and contraction of the same, said piston in part bounding a pressure chamber outside said bellows tube; and channel means for communicating said pressure chamber with a tire so that the piston is subject to the inflation pressure in the tire and shifts in said cylinder under concomittant change in the axial length of said bellows tube, in response to changes in the inflation pressure, said channel means including at least two channels each adapted to communicate with a different tire and each having an opening communicating with said pressure chamber, and said piston being movable to and from a position in which it blocks at least one of said openings.
Claim 3
Dependent Claim
45 words
An arrangement as defined in claim 1, wherein said piston is provided with a sealing element which overlies and seals said at least one opening when said piston moves to said position in response to the pressure in said chamber dropping below a predetermined level.
Claim 4
Dependent Claim
17 words
An arrangement as defined in claim 1; further comprising biasing means biasing said piston towards said position.
Claim 5
Dependent Claim
15 words
An arrangement as defined in claim 3, wherein said biasing means comprises a biasing spring.
Claim 6
Dependent Claim
25 words
An arrangement as defined in claim 3; and further comprising regulating means for regulating the biasing force exerted by said biasing means upon said piston.
Claim 7
Dependent Claim
35 words
An arrangement as defined in claim 1; and further comprising connecting means for connecting said chamber with a source of compressed air, so that all tires communicating with said channel means may be inflated simultaneously.
Claim 8
Dependent Claim
33 words
An arrangement as defined in claim 1; and further comprising lamp means operative for indicating the presence of pressure in excess of a predetermined limit in a tire connected with said channel means.
Claim 9
Dependent Claim
174 words
An arrangement for monitoring pneumatic tire inflation pressure, comprising a cylinder; an elongated bellows tube in said cylinder and having an end connected thereto and another end; a piston sealingly mounted in said other end and movable with said bellows tube during expansion and contraction of the same, said piston in part bounding a pressure chamber outside bellows tube; channel means for communicating said pressure chamber with a tire so that the piston is subject to the inflation pressure in the tire and shifts in said cylinder under concomitant change in the axial length of said bellows tube, in response to changes in the inflation pressure; a rod extending axially through said tube and having one end portion connected to said piston, and another end portion; biasing means biasing said piston toward said position; and regulating means for regulating the biasing force of said biasing means, comprising a threaded element surrounding said rod outside said tube and having external threads meshing with threads in said cylinder, said biasing means bearing upon said threaded element.
Claim 10
Dependent Claim
174 words
An arrangement for monitoring pneumatic tire inflation pressure, comprising a cylinder; an elongated bellows tube in said cylinder and having an end connected thereto and another end; a piston sealingly mounted in said other end and movable with said bellows tube during expansion and contraction of the same, said piston in part bounding a pressure chamber outside bellows tube; channel means for communicating said pressure chamber with a tire so that the piston is subject to the inflation pressure in the tire and shifts in said cylinder under concomitant change in the axial length of said bellows tube, in response to changes in the inflation pressure; a rod extending axially through said tube and having one end portion connected to said piston, and another end portion; biasing means biasing said piston toward said position; and regulating means for regulating the biasing force of said biasing means, comprising a threaded element surrounding said rod outside said tube and having external threads meshing with threads in said cylinder, said biasing means bearing upon said threaded element.
Claim 11
Dependent Claim
14 words
An arrnagement as defined in claim 8, wherein said threaded element is a nut.
Claim 12
Dependent Claim
22 words
An arrangement as defined in claim 8, wherein said threaded element is a nut which can be turned from outside said cylinder.
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) | 1980-11-14 | 1981-05-16 | 1981-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-14 | 1985-05-16 | 1985-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-14 | 1989-05-16 | 1989-11-15 | $7700.00 | Window Closed / Lapsed |