Patent US4318346A successfully refreshed from Google Patents.
US4318346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biased traveling crane drive
Assignee: Individual
•
Filing: 1979-11-16
•
Granted: 1982-03-09
•
Expires: 1999-11-16
Abstract
Abstract An overhead suspension load transporting trolley which is suspended from a track, such as the flange of an I beam, which has a drive wheel suspended below a carriage, which wheel is biased against the I beam by a counterweight on the opposite end of a lever from the drive wheel.
Inventors
- 👤 Charles E. Sessum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:55
CPC Classifications
B; B61; B61B; B61B13/00; B61B13/04; B66; B66C; B66C9/00; B66C9/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
125 words
A bridge crane for mounting onto two substantially parallel I-beams comprising two trolleys each comprising: a carriage mounted on wheels adapted to ride on a respective I-beam, a suspension frame extending from each said carriage and below each said carriage having a lever pivotally mounted to each said suspension frame and having a drive wheel mounted to each said lever toward one end thereof and a counterweight mounted toward the opposite end thereof, said counterweight tending to urge said drive wheel toward said carriage at a constant force to provide the only force causing each said drive wheel to engage each said I-beam, a connecting frame connecting said trolleys and a drive means mounted to said connecting frame and operably connected to each drive wheel.
Claim 2
Dependent Claim
125 words
A bridge crane for mounting onto two substantially parallel I-beams comprising two trolleys each comprising: a carriage mounted on wheels adapted to ride on a respective I-beam, a suspension frame extending from each said carriage and below each said carriage having a lever pivotally mounted to each said suspension frame and having a drive wheel mounted to each said lever toward one end thereof and a counterweight mounted toward the opposite end thereof, said counterweight tending to urge said drive wheel toward said carriage at a constant force to provide the only force causing each said drive wheel to engage each said I-beam, a connecting frame connecting said trolleys and a drive means mounted to said connecting frame and operably connected to each drive wheel.
Claim 3
Dependent Claim
20 words
The bridge crane according to claim 1 wherein said lever is pivotally mounted between said drive wheel and said counterbalance.
Claim 4
Dependent Claim
19 words
The bridge crane load transporting trolley according to claim 1 wherein drive wheels are powered by a common source.
Claim 5
Dependent Claim
23 words
The bridge crane load transporting trolley according to claim 3 wherein said common source is connected to said drive wheels by a shaft.
References Cited (Backward Citations)
DE239422C
Cited
DE432859C
Cited
US2317689A
Cited
US2617365A
Cited
US2608163A
Cited
US3518947A
Cited
US3698326A
Cited
US3854406A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-03-08 | 1985-09-07 | 1986-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-08 | 1989-09-07 | 1990-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-08 | 1993-09-07 | 1994-03-09 | $7700.00 | Window Closed / Lapsed |