Patent US3758827A successfully refreshed from Google Patents.
US3758827A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric ignition device
Assignee: US Philips Corp
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Filing: 1972-05-30
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Granted: 1973-09-11
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Expires: 1992-05-30
Abstract
Abstract A piezo-electric ignition device which comprises a housing in which are incorporated one behind the other a piezo-electric element, a hammer and a spring cooperating with the hammer. A plastic-elastic damping disk is arranged between the hammer and the element. Braking means inhibit the movement of the hammer in the direction of the spring.
Inventors
- 👤 J Schroder
- 👤 H Ganser
- 👤 H Oepen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:46
CPC Classifications
G; G03; G03B; G03B15/00; G03B15/02; G03B15/03; G03B15/04; G03B15/0452; G03B15/0463; F; F21; F21K; F21K5/00; F21K5/02; F21K5/023; F23; F23Q; F23Q3/00; F23Q3/002
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
142 words
A piezoelectric ignition device comprising, a cylindrical housing, an electrically insulated piezoelectric element having electrodes and being disposed within said housing, a hammer movable within said housing towards the piezoelectric element, a spring arranged to urge the hammer in a direction to provide a striking pulse to the piezoelectric element, a disk formed of a plastic elastic material which is softer than the material of the hammer and positioned between the piezoelectric element and the hammer, braking means secured to the hammer and in contact with the inner wall of the housing so as to provide a substantially smaller resistance to the movement of the hammer in the direction towards the piezoelectric element than in the opposite direction away from said element, and opening means for relieving the air pressure developed between the hammer and the piezoelectric element during a striking pulse.
Claim 2
Dependent Claim
142 words
A piezoelectric ignition device comprising, a cylindrical housing, an electrically insulated piezoelectric element having electrodes and being disposed within said housing, a hammer movable within said housing towards the piezoelectric element, a spring arranged to urge the hammer in a direction to provide a striking pulse to the piezoelectric element, a disk formed of a plastic elastic material which is softer than the material of the hammer and positioned between the piezoelectric element and the hammer, braking means secured to the hammer and in contact with the inner wall of the housing so as to provide a substantially smaller resistance to the movement of the hammer in the direction towards the piezoelectric element than in the opposite direction away from said element, and opening means for relieving the air pressure developed between the hammer and the piezoelectric element during a striking pulse.
Claim 3
Dependent Claim
68 words
An ignition device as claimed in claim 1 wherein said braking means comprise at least one ring member secured to the hammer and made of a synthetic material, the outer circumference of the ring engaging the inner wall of the housing and the ring being secured to the hammer in a manner to provide said smaller resistance to the hammer movement in the direction of the piezoelectric element.
Claim 4
Dependent Claim
68 words
An ignition device as claimed in claim 2 wherein said ring is located in an annular recess in the hammer so that the major part of the ring surface closest to the piezoelectric element is supported by the hammer surface whereas a major part of the opposite surface of the ring is unsupported whereby the ring is free to flex when the hammer moves towards the piezoelectric element.
Claim 5
Dependent Claim
57 words
An ignition device as claimed in claim 2 further comprising a second ring movable in a direction parallel to the hammer movement and secured to one end of said spring, said second ring being located within the housing so as to be contacted by the hammer for movement thereby in a direction away fRom the piezoelectric element.
Claim 6
Dependent Claim
43 words
An ignition device as claimed in claim 2 wherein said braking means further comprises a second ring member secured to the hammer at an area axially displaced from the first ring and with its outer circumference engaging the inner wall of the housing.
Claim 7
Dependent Claim
67 words
An ignition device as claimed in claim 1 further comprising an insulating tube within the housing and with the piezoelectric element located within the insulating tube, and said pressure relieving means comprises an air hole in the housing in the area where the hammer strikes the plastic disk thereby to prevent compression of the air within the housing when the hammer is moved towards the piezoelectric element.
Claim 8
Dependent Claim
57 words
An ignition device as claimed in claim 1 wherein the housing is made of an electric conductor material and said electrodes include a first electrode connected to a point on the piezoelectric element and a second electrode connected to the housing, said piezoelectric element having one surface in electric contact with the inner surface of the housing.
Claim 9
Dependent Claim
41 words
An ignition device as claimed in claim 1 wherein said braking means comprises at least one check valve arranged in the wall of the housing and located on the side of the hammer that is opposite to the hammer striking face.
Claim 10
Dependent Claim
16 words
An ignition device as claimed in claim 2 wherein said disk is composed of polyvinyl chloride.
References Cited (Backward Citations)
US2717589A
Cited
US3271624A
Cited
US3298421A
Cited
US3384786A
Cited
US3449637A
Cited
US3464531A
Cited
US3523201A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |