Patent US3665176A successfully refreshed from Google Patents.
US3665176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic flashlamp unit
Assignee: GTE Sylvania Inc
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Filing: 1971-02-18
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Granted: 1972-05-23
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Expires: 1991-02-18
Abstract
Abstract A multilamp photographic flashlamp unit, the lamps of which are of the percussive primer type, having self-contained firing elements each in the form of a self-latching folded torsional spring. The spring is shaped as a hairpin having two segments joined at the top by a bight with a supporting foot projecting from the lower end of one of the segments and a striker projecting from the bottom of the other segment for firing an associated lamp. One of the segments has a deformation just above the striker which tends to engage the other segment for stabilizing both the cocked position and arc of travel of the striker.
Inventors
- 👤 John W Shaffer
- 👤 Thomas B Mcdonough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:52
CPC Classifications
G; G03; G03B; G03B15/00; G03B15/02; G03B15/03; G03B15/04; G03B15/0478; G03B15/0489; F; F21; F21K; F21K5/00; F21K5/02; F21K5/023
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
139 words
In a photographic flashlamp unit having a plurality of percussively-ignitable flashlamps with primer tubes depending therefrom mounted on a base, a folded torsional firing spring for eaCh of said lamps disposed on said base, said firing spring comprising a substantially hairpin torsional section having two segments joined by a bight, a striker projecting from one of said segments, a supporting foot projecting from the other of said segments, and a catch formed at the tip of said foot, said striker crossing said foot and bearing against the segment from which said foot projects with said catch restraining said striker in a cocked condition, and one of said segments having a deformation located substantially adjacent to said striker between said bight and said striker, said deformation retaining said striker in firm engagement with the segment from which said foot projects.
Claim 2
Dependent Claim
139 words
In a photographic flashlamp unit having a plurality of percussively-ignitable flashlamps with primer tubes depending therefrom mounted on a base, a folded torsional firing spring for eaCh of said lamps disposed on said base, said firing spring comprising a substantially hairpin torsional section having two segments joined by a bight, a striker projecting from one of said segments, a supporting foot projecting from the other of said segments, and a catch formed at the tip of said foot, said striker crossing said foot and bearing against the segment from which said foot projects with said catch restraining said striker in a cocked condition, and one of said segments having a deformation located substantially adjacent to said striker between said bight and said striker, said deformation retaining said striker in firm engagement with the segment from which said foot projects.
Claim 3
Dependent Claim
73 words
The combination of claim 1 in which said deformation in one of said segment tends to engage the other of said segments whereby said striker is retained in pivotal engagement with the segment from which said foot projects during cocking of said striker and, upon release of said striker from said catch, the travel of said striker is controlled to define a substantially circular arc about the segment from which said foot projects.
Claim 4
Dependent Claim
30 words
The combination of claim 1 in which the diameter of said bight of said spring is equal to or less than 3 1/2 times the wire diameter of said spring.
Claim 5
Dependent Claim
34 words
The combination of claim 1 in which the lateral excursion of said deformation is greater than one-half the wire diameter of said spring and less than four times the wire diameter of said spring.
Claim 6
Dependent Claim
19 words
The combination of claim 4 in which said deformation is formed in the segment from which said striker projects.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |