Patent US4171132A successfully refreshed from Google Patents.
US4171132A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Infant walking trainer
Assignee: Aprica Kassai KK
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Filing: 1977-12-19
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Granted: 1979-10-16
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Expires: 1997-12-19
Abstract
Abstract An infant walking trainer can be folded by easy operation. The infant walking trainer includes a lower circular frame provided with a plurality of wheels, an upper circular frame confronting the lower circular frame, a lower supporting rod pivotally and rotatably projecting from the lower circular frame, and an upper supporting rod pivotally and rotatably depending from the upper circular frame. A connecting means connects the upper end of the lower supporting rod and the lower end of the upper supporting rod rotatably with each other. Lower and upper engaging grooves and lower and upper engaging portions are provided on the upper end of the lower supporting rod and on the lower end of the upper supporting rod respectively. An engaging member fixes the lower and upper supporting rods collinearly by being engaged with the lower and upper engaging portions, the engaging means being slidable with the lower and upper engaging grooves. A resilient engaged state maintaining member maintains the engaged state of the engaging member.
Inventors
- 👤 Kenzou Kassai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:12
CPC Classifications
A; A47; A47D; A47D13/00; A47D13/04; A47D13/043; F; F16; F16C; F16C11/00; F16C11/04; F16C11/10; Y; Y10; Y10T; Y10T403/00; Y10T403/32; Y10T403/32254; Y10T403/32262; Y10T403/32319; Y10T403/32393
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
238 words
An infant walking trainer, comprising: a lower circular frame provided with a plurality of wheels; an upper circular frame confronting said lower circular frame; a lower supporting rod pivotally and rotatably projecting from said lower circular frame; a first stopper provided on said lower circular frame and contacting the outer side of said lower supporting rod when in the engaged state, for limiting outward rotation of said lower supporting rod; an upper supporting rod pivotally and rotatably depending from said upper circular frame; a second stopper provided in the internal surface of said upper circular frame and contacting the outer side of said upper supporting rod when in the engaged state, for limiting outward rotation of said upper supporting rod; a connecting means connecting the upper end of said lower supporting rod and the lower end of said upper supporting rod rotatably with each other; at least one lower and one upper engaging groove and a lower and an upper engaging portion which are provided on the upper end of said lower supporting rod and on the lower end of said upper supporting rod, respectively; an engaging means for fixing said lower and upper supporting rods collinearly by engaging both said lower and upper engaging portions when in the engaged state, said engaging means being slidable with said lower and upper engaging grooves; and an engaged state maintaining means for maintaining the engaged state of said engaging means.
Claim 2
Dependent Claim
238 words
An infant walking trainer, comprising: a lower circular frame provided with a plurality of wheels; an upper circular frame confronting said lower circular frame; a lower supporting rod pivotally and rotatably projecting from said lower circular frame; a first stopper provided on said lower circular frame and contacting the outer side of said lower supporting rod when in the engaged state, for limiting outward rotation of said lower supporting rod; an upper supporting rod pivotally and rotatably depending from said upper circular frame; a second stopper provided in the internal surface of said upper circular frame and contacting the outer side of said upper supporting rod when in the engaged state, for limiting outward rotation of said upper supporting rod; a connecting means connecting the upper end of said lower supporting rod and the lower end of said upper supporting rod rotatably with each other; at least one lower and one upper engaging groove and a lower and an upper engaging portion which are provided on the upper end of said lower supporting rod and on the lower end of said upper supporting rod, respectively; an engaging means for fixing said lower and upper supporting rods collinearly by engaging both said lower and upper engaging portions when in the engaged state, said engaging means being slidable with said lower and upper engaging grooves; and an engaged state maintaining means for maintaining the engaged state of said engaging means.
Claim 3
Dependent Claim
79 words
An infant walking trainer according to claim 1 wherein said lower and upper engaging grooves are provided on both sides of said lower and upper engaging portions are provided on the portion of said respective lower and upper supporting rods facing the interior of said circular frames when in the engaged state, said engaging means is C-shaped in cross section, and both confronting tops of said C-shaped engaging means are slidably engaged with said lower and upper engaging grooves.
Claim 4
Dependent Claim
93 words
An infant walking trainer according to claim 2, wherein a stopping projection is provided at the bottom of said lower engaging portion of said lower supporting rod to contact with said engaging means in the engaged state thereof, and said engaged state maintaining means depends from the upper portion of said upper supporting rod to prevent the upward movement of said engaging means, said maintaining means being insertable into the cavity of said C-shaped engaging means when said engaging means is moved upwardly after pushing said maintaining means toward said upper supporting rod.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-15 | 1983-04-16 | 1983-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-15 | 1987-04-16 | 1987-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-15 | 1991-04-16 | 1991-10-16 | $7700.00 | Window Closed / Lapsed |