US4576352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exercise treadmill
Assignee: AJAY ENTERPRISES Corp A CORP OF
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Filing: 1982-09-27
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Granted: 1986-03-18
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Expires: 2002-09-27
Abstract
Abstract A treadmill exercising apparatus of the inclineable slider bed type in which the apparatus frame at its head end is equipped with a cross member that is coupled to a pair of spaced apart threaded screw members for changing the inclination of the treadmill frame, in which the coupling of the frame cross member to the respective threaded screw members is by way of special nut assemblies that each include a tubular member or shell fixed to the respective ends of the frame cross member, a lower nut member that is keyed to the tubular member involved at that end of the cross member, and is in load transmitting relation to the screw member it engages, and on which, the respective tubular members rest, and an upper nut member that is keyed to the respective tubular members for lost motion movement relative thereto, but which is not in load transmitting relation to the respective screw members, whereby the upper nuts are free to float longitudinally of the respective screw members to accommodate tolerance variations in the formation of the threading of the latter.
Inventors
- 👤 Ralph Ogden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:09
CPC Classifications
A; A63; A63B; A63B22/00; A63B22/0015; A63B22/0023; A63B22/02; A63B22/0235; A63B22/0242; A63B22/0257; A63B22/0285
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
267 words
In a screw and nut load support device, including a rotatable rectilinear screw member including an externally threaded portion, means for supporting the screw member in an upright position against loads acting longitudinally and downwardly of said screw member, a load bearing nut assembly threadedly mounted on said screw member threaded portion in load transmitting relation thereto for applying to said screw member loads acting longitudinally and downwardly of said screw member, means for rotating said screw member about its said longitudinal axis for threadedly shifting said nut assembly longitudinally of said screw member threaded portion, and means for holding said nut assembly against rotation with said screw member, the improvement wherein said nut assembly comprises: a tubular member received about said screw member threaded portion and including means for applying to same said loads acting downwardly of said screw member, a first nut member threadedly received on said screw member threaded portion, said nut member being keyed to said tubular member adjacent the lower end of said tubular member against rotational movement relative thereto, and a second nut member threadedly received on said screw member threaded portion, said second nut member being keyed to said tubular member above said first nut member for lost motion movement thereof longitudinally of said tubular member and against rotational movement relative to said tubular member, with said tubular member being in load transmitting relation to said first nut member to the exclusion of said second nut member, and said first nut member being in threaded load transmitting relation to said screw member to the exclusion of said second nut member.
Claim 2
Dependent Claim
267 words
In a screw and nut load support device, including a rotatable rectilinear screw member including an externally threaded portion, means for supporting the screw member in an upright position against loads acting longitudinally and downwardly of said screw member, a load bearing nut assembly threadedly mounted on said screw member threaded portion in load transmitting relation thereto for applying to said screw member loads acting longitudinally and downwardly of said screw member, means for rotating said screw member about its said longitudinal axis for threadedly shifting said nut assembly longitudinally of said screw member threaded portion, and means for holding said nut assembly against rotation with said screw member, the improvement wherein said nut assembly comprises: a tubular member received about said screw member threaded portion and including means for applying to same said loads acting downwardly of said screw member, a first nut member threadedly received on said screw member threaded portion, said nut member being keyed to said tubular member adjacent the lower end of said tubular member against rotational movement relative thereto, and a second nut member threadedly received on said screw member threaded portion, said second nut member being keyed to said tubular member above said first nut member for lost motion movement thereof longitudinally of said tubular member and against rotational movement relative to said tubular member, with said tubular member being in load transmitting relation to said first nut member to the exclusion of said second nut member, and said first nut member being in threaded load transmitting relation to said screw member to the exclusion of said second nut member.
Claim 3
Dependent Claim
47 words
The improvement set forth in claim 1 wherein: said tubular member gravitationally rests on said first nut member, and said second nut member is free to float longitudinally of said tubular member to accommodate tolerance variations in the formation of the external threading of said screw member.
Claim 4
Dependent Claim
20 words
The improvement set forth in claim 2 wherein: said tubular member is free of bonding to both said nut members.
Claim 5
Dependent Claim
31 words
The improvement set forth in claim 1 wherein: said screw member and said tubular member are formed from metal, with said nut members being formed from a non-metallic self lubricating material.
Claim 6
Dependent Claim
21 words
The improvement set forth in claim 1 wherein: said threading of said screw member threaded portion is defined by rolled threading.
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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) | 1989-03-17 | 1989-09-16 | 1990-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-17 | 1993-09-16 | 1994-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-17 | 1997-09-16 | 1998-03-18 | $7700.00 | Window Closed / Lapsed |