US3662703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tire underinflation telltale device
Assignee: Individual
•
Filing: 1970-09-03
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Granted: 1972-05-16
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Expires: 1990-09-03
Abstract
Abstract A casing with two compartments has in one cylinder compartment a plunger, and in the other compartment a replaceable spray can which has some sliding freedom therein, with the plunger being on one side subjected to air pressure which is always the same as the air pressure in an associated tire, and being on its other side subjected to the force of a preloaded spring which will displace the plunger when the tire pressure drops below a given safe minimum pressure. The can is provided with a normally closed valve which is depressible for opening, and the plunger will, on displacement, move the can with its valve against an abutment to thereby depress and open the valve for discharge of a telltale spray from the can and its passage through a tube against the tire to form a readily perceptible telltale mark or blot thereon.
Inventors
- 👤 Richard M Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:02
CPC Classifications
B; B60; B60C; B60C23/00; B60C23/02
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
151 words
An underinflation telltale device for a pneumatic tire with a valve stem on a vehicle wheel, comprising a casing mounted on said wheel and having a compartment and a cylinder chamber with an end; a plunger in said chamber, with said chamber end being in communication with said valve stem so as to hold the same air pressure as the tiRe; preloaded spring means in said chamber tending to displace said plunger against the compressed air in said chamber end; a tire-marking device, including a spray can in said compartment and conduit means for directing spray from the can against said tire, said can containing an aerosol suspension of gas and telltale liquid, and having a normally closed spray discharge valve depressible for opening; and means acting to depress said valve on plunger displacement by said spring means when the air pressure in said chamber end drops below a certain pressure.
Claim 2
Dependent Claim
151 words
An underinflation telltale device for a pneumatic tire with a valve stem on a vehicle wheel, comprising a casing mounted on said wheel and having a compartment and a cylinder chamber with an end; a plunger in said chamber, with said chamber end being in communication with said valve stem so as to hold the same air pressure as the tiRe; preloaded spring means in said chamber tending to displace said plunger against the compressed air in said chamber end; a tire-marking device, including a spray can in said compartment and conduit means for directing spray from the can against said tire, said can containing an aerosol suspension of gas and telltale liquid, and having a normally closed spray discharge valve depressible for opening; and means acting to depress said valve on plunger displacement by said spring means when the air pressure in said chamber end drops below a certain pressure.
Claim 3
Dependent Claim
61 words
An underinflation telltale device as in claim 1, in which said compartment has an internal abutment, said can has in said compartment sliding freedom to and from said abutment, said valve faces and is aligned with said abutment, and said means act on said plunger displacement to slide said can toward said abutment for depression of said valve by said abutment.
Claim 4
Dependent Claim
45 words
An underinflation telltale device as in claim 2, in which said abutment is an end part of said conduit means, and said valve has a central discharge duct which on depression of said valve is in communication with said end part of said conduit means.
Claim 5
Dependent Claim
40 words
An underinflation telltale device as in claim 3, in which said endpart of said conduit means has a seat on which said valve, when depressed, is seated with a sealing fit to keep spray from the interior of said compartment.
Claim 6
Dependent Claim
89 words
An underinflation telltale device as in claim 3, in which said compartment is cylindrical and coaxial with said chamber and separated therefrom by a partition in said casing, with said partition forming part of said one chamber end and one end of said compartment, said compartment having another end carrying said end part of said conduit means, said can has an axial sliding fit in said compartment, and said means provide a shank on said plunger extending with a sealing sliding fit through said partition and into said compartment.
Claim 7
Dependent Claim
39 words
An underinflation telltale device as in claim 5, in which said chamber is closed at its end opposite to said one end thereof, and said spring means is a compression spring interposed between said plunger and opposite chamber end.
Claim 8
Dependent Claim
64 words
An underinflation telltale device as in claim 5, in which said chamber is closed at its end opposite to said one chamber end, said spring means is a compression spring, and there is further provided an adjustment screw threadedly received in said opposite chamber end and carrying in said chamber a spring retainer, with said compression spring being interposed between said plunger and retainer.
Claim 9
Dependent Claim
54 words
An underinflation telltale device as in claim 5, in which said other compartment end is open through which to slide said can into and from said compartment, and there is further provided a cover releasably attached to said casing to close said other compartment end, and carrying said end part of said conduit means.
Claim 10
Dependent Claim
24 words
An underinflation telltale device as in claim 8, in which said cover is threadedly received by said casing to close said other compartment end.
Claim 11
Dependent Claim
110 words
An underinflation telltale device as in claim 5, in which said means further provide a snap-over device in said compartment between said can and partition, with said device having an element resiliently snappable into first and second positions in which it is in the path of said shank on said plunger displacement and holds said can into an active position in which its valve is depressed, respectively, with said element being snapped from said first position over into said second position by said shank on said plunger displacement, and said element will on said snap-over from said first position to said second position slide said can into said active position.
Claim 12
Dependent Claim
66 words
An underinflation telltale device as in claim 10, in which said snap-over device includes diametrically opposite notch formations in the inner periphery of said compartment, and said element is a leaf spring anchored with its ends in said notch formations and being oppositely curved in said first and sEcond positions, with said leaf spring passing through S-flexure on snap-over from either position to the other position.
Claim 13
Dependent Claim
83 words
An underinflation telltale device as in claim 11, in which said other compartment end is open through which to slide said can into and from said compartment, with said can, on slide-in into said compartment, snapping said leaf spring from said second position into said first position when the tire pressure is above said certain pressure, and there is further provided a cover releasable attached to said casing to close said other compartment end, and carrying said end part of said conduit means.
Claim 14
Dependent Claim
110 words
An underinflation telltale device as in claim 2, in which said compartment is laterally displaced from said chamber, said plunger has opposite faces, of which one face is subjected to the air pressure in said chamber end, and said means provide a shank on the other face of said plunger, and a lever pivoted in said casing and having opposite ends of which one end is floatingly pivotally connected with said plunger shank, and the other end projects into said compartment, with said lever being on said plunger displacement swung to slide said can with said other lever end toward said abutment for depression of said valve by said abutment.
Claim 15
Dependent Claim
46 words
An underinflation telltale device as in claim 13, in which there is further provided in said chamber an apertured collar through which said plunger shank extends with sliding freedom, and said spring means is a compression spring interposed between said collar and said other plunger face.
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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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |