Patent US4085477A successfully refreshed from Google Patents.
US4085477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flue and chimney cleaners
Assignee: Individual
•
Filing: 1977-05-13
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Granted: 1978-04-25
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Expires: 1997-05-13
Abstract
Abstract A tool for cleaning flues or chimneys which has surface-engaging scrapers, levers for displacing the scrapers into engagement with the surfaces to be cleaned, and a resilient connector between the levers and an actuator therefor. The tool may be so made as to interchangeably accommodate scrapers of different sizes and shapes, and the blades may be made adjustable so that the same set of scrapers can be used in cleaning chimneys or flue surfaces of different dimensions.
Inventors
- 👤 Charles H. Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:15
CPC Classifications
F; F23; F23J; F23J3/00; F23J3/02; F23J3/026
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
135 words
A tool for cleaning chimneys, flues, and the like comprising: a support opposed depending arms pivotally fixed at their upper ends to opposite ends of said support; scrapers having outwardly facing scraping edges fixed to the lower ends of said arms; inwardly extending levers pivotally secured at their outer ends to the lower ends of said depending arms; an actuator rectilinearly displaceable relative to said support; and a spring fixed at one end to said actuator; the other end of said spring pivotally connecting together the inner ends of said levers, whereby rectilinear displacement of said actuator relative to said support will effect pivotal movement of said arms relative to said support with said spring providing a resilient connection therebetween to aid in the prevention of binding between the scrapers and a structure being cleaned.
Claim 2
Dependent Claim
135 words
A tool for cleaning chimneys, flues, and the like comprising: a support opposed depending arms pivotally fixed at their upper ends to opposite ends of said support; scrapers having outwardly facing scraping edges fixed to the lower ends of said arms; inwardly extending levers pivotally secured at their outer ends to the lower ends of said depending arms; an actuator rectilinearly displaceable relative to said support; and a spring fixed at one end to said actuator; the other end of said spring pivotally connecting together the inner ends of said levers, whereby rectilinear displacement of said actuator relative to said support will effect pivotal movement of said arms relative to said support with said spring providing a resilient connection therebetween to aid in the prevention of binding between the scrapers and a structure being cleaned.
Claim 3
Dependent Claim
24 words
A tool as defined in claim 1 in which said support has a tubular stem and said actuator is slidably supported in said stem.
Claim 4
Dependent Claim
29 words
A tool as defined in claim 1 in which said scrapers are oriented transversely of said arms and wherein said scrapers are adjustable in length in said transverse direction.
Claim 5
Dependent Claim
83 words
A tool as defined in claim 3 in which each of said scrapers is composed of a pair of blades, in which there are elongated slots in said blades, and in which the means for fixing said scrapers to said arms comprise threaded members fixed relative to said arms and relative to which said blades can be slid to vary the length of the scrapers and retainers threaded on said members for fixing said blades in the positions to which they are adjusted.
Claim 6
Dependent Claim
16 words
A tool as defined in claim 1 in which the scrapers have straight, continuous scraping edges.
Claim 7
Dependent Claim
16 words
A tool as defined in claim 1 in which the scrapers have arcuate, continuous scraping edges.
References Cited (Backward Citations)
US518638A
Cited
US1315849A
Cited
US1392202A
Cited
US1543018A
Cited
US1582309A
Cited
FR1006779A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-24 | 1981-10-24 | 1982-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-24 | 1985-10-24 | 1986-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-24 | 1989-10-24 | 1990-04-25 | $7700.00 | Window Closed / Lapsed |