US3789213A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Counterbalanced lamp
Assignee: SONNEMAN R ASS Inc
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Filing: 1973-04-24
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Granted: 1974-01-29
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Expires: 1993-04-24
Abstract
Abstract A lamp having an elevated, freely movable light boom counterbalanced, by a weight located adjacent the lamp base. The weight is attached to a lever pivotally mounted on the lamp base. The lever is connected to an end of the light boom by means of a cable and pulley arrangement. Thus, inadvertent disengagement of the weight or its movement presents an optimum, minimum safety hazard.
Inventors
- 👤 R Sonneman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:18
CPC Classifications
F; F21; F21S; F21S6/00; F21S6/005; F21S6/006; F21V; F21V21/00; F21V21/14; F21V21/26
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
132 words
A lamp comprising a boom having opposite first and second operative ends, a light supported adjacent said first boom operative end, an upright support in supporting connection beneath said boom at a location between said boom first and second operative ends so as to maintain said light normally in an elevated position, a counterweight to said boom supported on said upright support at a remote location below said supporting connection to said boom adjacent the base of said upright support, and a pulley means operatively arranged on said upright support between said counterweight and said boom operatively interconnecting in counterbalancing relation said counterweight and said boom second operative end, whereby movement of said counterweight caused by boom movement is confined to an optimum safe area adjacent the base of said upright support.
Claim 2
Dependent Claim
132 words
A lamp comprising a boom having opposite first and second operative ends, a light supported adjacent said first boom operative end, an upright support in supporting connection beneath said boom at a location between said boom first and second operative ends so as to maintain said light normally in an elevated position, a counterweight to said boom supported on said upright support at a remote location below said supporting connection to said boom adjacent the base of said upright support, and a pulley means operatively arranged on said upright support between said counterweight and said boom operatively interconnecting in counterbalancing relation said counterweight and said boom second operative end, whereby movement of said counterweight caused by boom movement is confined to an optimum safe area adjacent the base of said upright support.
Claim 3
Dependent Claim
26 words
A lamp as defined in claim 1 wherein said counterweight includes a pivotally mounted lever and a weight supported on the free end of said lever.
Claim 4
Dependent Claim
50 words
A lamp as defined in claim 2 wherein said pulley means includes upper and lower pulleys journalled on said upright support and a cable connected at one end to said boom second operative end, threaded about said pulleys, and connected at said other end to said lever of said counterweight.
Claim 5
Dependent Claim
41 words
A lamp as defined in claim 3 wherein said cable is disposed in looped arrangement about said pulleys so as to maximize frictional engagement therewith, to thereby contribute to maintaining the equilibrium of said boom in each position of movement thereof.
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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |