Patent US5280129A successfully refreshed from Google Patents.
Patent US5468005A successfully refreshed from Google Patents.
US5468005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foldable cart
Assignee: I-HANG YANG
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Filing: 1994-07-05
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Granted: 1995-11-21
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Expires: 2014-07-05
Abstract
Abstract A foldable cart comprises a handle, a pair of wheels pivotally mounted to the bottom respective ends of the handle, and a loading platform at the bottom of the cart in an opposite direction with respect to the wheels. The loading platform has a pair of conical gears at the rear respective ends adapted to engage with a pair of crown gears located at the bottom ends of the wheel frames to adjust the position of the loading platform with respect to the cart.
Inventors
- 👤 Ching S. Yang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:27
CPC Classifications
B; B62; B62B; B62B1/00; B62B1/10; B62B1/12; B62B2205/00; B62B2205/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
263 words
A foldable cart comprising a handle having two ends turned 90 degrees downwardly and pivotally connected to a pair of legs, a pair of U-shaped members at said pivotal connection of said handle and said legs, a pair of wheel frames and a loading platform being secured to the bottom portions of said legs, and the improvement comprising: said loading platform having a pair of fixturing housings at respective rear corners and a pair of guiding blocks secured in said fixturing housings, each of said fixturing housings having an aperture formed through an outer wall thereof, a rectangular recess formed in an inside surface of said outer wall and a bulge portion formed at top portion of an inner wall thereof, each said guiding block having conical gear teeth formed on a top portion thereof, a boss at one side disposed within said rectangular recess and having an aperture formed concentric with said guiding block and disposed in alignment with said aperture of said fixturing housing, each said wheel frame having a sleeve formed at a rear end portion thereof, said sleeve having an inner diameter slightly larger than an outer diameter of each said leg, a crown gear being integrally formed at a bottom portion of each said sleeve to be meshingly engaged with said conical gear teeth of a respective guiding block, a block being integrally formed on a bottom portion of each said wheel frame having a slanted flank disposed in engaged relationship with said bulge portion of said fixturing housing when said loading platform is in an extended position.
Claim 2
Dependent Claim
263 words
A foldable cart comprising a handle having two ends turned 90 degrees downwardly and pivotally connected to a pair of legs, a pair of U-shaped members at said pivotal connection of said handle and said legs, a pair of wheel frames and a loading platform being secured to the bottom portions of said legs, and the improvement comprising: said loading platform having a pair of fixturing housings at respective rear corners and a pair of guiding blocks secured in said fixturing housings, each of said fixturing housings having an aperture formed through an outer wall thereof, a rectangular recess formed in an inside surface of said outer wall and a bulge portion formed at top portion of an inner wall thereof, each said guiding block having conical gear teeth formed on a top portion thereof, a boss at one side disposed within said rectangular recess and having an aperture formed concentric with said guiding block and disposed in alignment with said aperture of said fixturing housing, each said wheel frame having a sleeve formed at a rear end portion thereof, said sleeve having an inner diameter slightly larger than an outer diameter of each said leg, a crown gear being integrally formed at a bottom portion of each said sleeve to be meshingly engaged with said conical gear teeth of a respective guiding block, a block being integrally formed on a bottom portion of each said wheel frame having a slanted flank disposed in engaged relationship with said bulge portion of said fixturing housing when said loading platform is in an extended position.
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) | 1998-11-20 | 1999-05-22 | 1999-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-11-20 | 2003-05-22 | 2003-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-11-20 | 2007-05-22 | 2007-11-21 | $7700.00 | Window Closed / Lapsed |