US3918734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Collapsible structure
Assignee: Lawrence Wilson and Son Ltd
•
Filing: 1974-03-04
•
Granted: 1975-11-11
•
Expires: 1994-03-04
Abstract
Abstract A collapsible structure comprising a bottom X-like frame composed of two interpivotted rigid members, and a pair of side X-like frames each composed of two interpivotted rigid elements and each pivotally connected to the bottom X-like frame, the members of each side frame being interconnected for relative movement about two axes of rotation, a foldable handle connected to the interpivotting point of the members of said bottom X-like frame, and means to maintain the structure in an erected position in which the side X-like frames are located in generally vertical planes, release of said means and movement of said handle towards said bottom X-like frame causing relative movement between the members of the bottom X-like frame and between the members of the side X-like frames, and movement of the side frames towards one another, so that said members lie in juxtaposed positions in generally parallel planes. In its application to a baby carriage the structure will carry a collapsible seating unit and wheels and brake/stabiliser assemblies.
Inventors
- 👤 Angus Christopher Firth
- 👤 Frederick John Sheldon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:54
CPC Classifications
A; A61; A61G; A61G5/00; A61G5/08; A61G5/0808; A61G5/085; A61G5/0891; A61G5/10; A61G5/12; A61G5/121; B; B62; B62B; B62B7/00; B62B7/04; B62B7/06; B62B9/00; B62B9/08; B62B9/082; B62B2205/00; B62B2205/02; B62B2205/20; B62B5/00; B62B5/04; B62B5/049; B62B7/004
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
228 words
In a collapsible structure of the type having 1. a pair of side frames, each side frame including two members pivotally interconnected intermediate their ends to form an Xlike foldable frame, corresponding members of the two side frames being spaced apart and substantially parallel to each other in the erected state of the structure, 2. a bottom frame having two members connected intermediate their ends by pivotal means to form an X-like foldable frame, the bottom frame extending between the two side frames and being pivotally connected to the members thereof whereby folding of the members of the bottom frame is accompanied by folding of the members of the side frames, and 3. means for locking the structure in its erected state, the improvement wherein the means for locking the structure in its erected state comprises a. a latch bar extending between and attached to a member of each side frame, b. a handle support pivotally connected to the pivotal means of the bottom frame whereby the handle support can be swung toward and away from the latch bar, c. a handle pivotally secured to the handle support whereby the handle can be moved toward and away from the bottom X-like frame, and d. a latch carried on the handle support, the latch being adapted to engage the latch bar to lock the structure in its erected state.
Claim 2
Dependent Claim
228 words
In a collapsible structure of the type having 1. a pair of side frames, each side frame including two members pivotally interconnected intermediate their ends to form an Xlike foldable frame, corresponding members of the two side frames being spaced apart and substantially parallel to each other in the erected state of the structure, 2. a bottom frame having two members connected intermediate their ends by pivotal means to form an X-like foldable frame, the bottom frame extending between the two side frames and being pivotally connected to the members thereof whereby folding of the members of the bottom frame is accompanied by folding of the members of the side frames, and 3. means for locking the structure in its erected state, the improvement wherein the means for locking the structure in its erected state comprises a. a latch bar extending between and attached to a member of each side frame, b. a handle support pivotally connected to the pivotal means of the bottom frame whereby the handle support can be swung toward and away from the latch bar, c. a handle pivotally secured to the handle support whereby the handle can be moved toward and away from the bottom X-like frame, and d. a latch carried on the handle support, the latch being adapted to engage the latch bar to lock the structure in its erected state.
Claim 3
Dependent Claim
30 words
The improvement according to claim 1, wherein the handle is secured to the latch bar in a manner permitting the handle to rotate about the latch bar as an axis.
Claim 4
Dependent Claim
57 words
a bottom frame having two members connected intermediate their ends by pivotal means to form an X-like foldable frame, the bottom frame extending between the two side frames and being pivotally connected to the members thereof whereby folding of the members of the bottom frame is accompanied by folding of the members of the side frames, and
Claim 5
Dependent Claim
57 words
a bottom frame having two members connected intermediate their ends by pivotal means to form an X-like foldable frame, the bottom frame extending between the two side frames and being pivotally connected to the members thereof whereby folding of the members of the bottom frame is accompanied by folding of the members of the side frames, and
Claim 6
Dependent Claim
30 words
The improvement according to claim 2, wherein the latch bar is pivotally attached to each side frame by means permitting the side frames to pivot relative to the latch bar.
Claim 7
Dependent Claim
115 words
means for locking the structure in its erected state, the improvement wherein the means for locking the structure in its erected state comprises a. a latch bar extending between and attached to a member of each side frame, b. a handle support pivotally connected to the pivotal means of the bottom frame whereby the handle support can be swung toward and away from the latch bar, c. a handle pivotally secured to the handle support whereby the handle can be moved toward and away from the bottom X-like frame, and d. a latch carried on the handle support, the latch being adapted to engage the latch bar to lock the structure in its erected state.
Claim 8
Dependent Claim
115 words
means for locking the structure in its erected state, the improvement wherein the means for locking the structure in its erected state comprises a. a latch bar extending between and attached to a member of each side frame, b. a handle support pivotally connected to the pivotal means of the bottom frame whereby the handle support can be swung toward and away from the latch bar, c. a handle pivotally secured to the handle support whereby the handle can be moved toward and away from the bottom X-like frame, and d. a latch carried on the handle support, the latch being adapted to engage the latch bar to lock the structure in its erected state.
References Cited (Backward Citations)
US1869205A
Cited
US2174268A
Cited
US2573106A
Cited
US3024035A
Cited
US3217839A
Cited
US3390893A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |