US4736944A
Expired / Lapsed
US
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Exercise rowing machine frame structure
Assignee: M&R Industries Inc
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Filing: 1986-10-09
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Granted: 1988-04-12
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Expires: 2006-10-09
Abstract
Abstract An exercise rowing machine has a frame structure with a center track rail, front and rear cross-members supporting the track rail, and a U-frame connected to the track rail and the front cross-member. The front cross-member is a one-piece molded part providing a seat for the track rail, saddles for a pivot shaft for foot plates, clevises for pivotal connection to hydraulic cylinder units which are pivotally connected to rowing arms in turn pivotally connected to the U-frame, sockets for receiving the U-frame, and supports for front transport wheels.
Inventors
- 👤 Jeffrey B. Johnson
- 👤 Allan F. Strickland
- 👤 Daniel R. Moon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:33
CPC Classifications
A; A63; A63B; A63B22/00; A63B22/0076; A63B22/0025; A63B2022/0041; A63B2022/0082; A63B2022/0084
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
270 words
In an exercise rowing machine: an elongated center rail member having front and rear ends and being formed along its underside with a T-slot having a leg portion exposed at its lower end and a cross-arm portion at the top of the leg portion; a one-piece front cross-member having a rearwardly facing central socket and a rearwardly projecting central ledge continuing from the bottom face of the central socket, said central ledge having a central opening therethrough, a forward end portion of said rail member resting on said ledge and extending into said central socket with its T-slot registering with said central opening; a one-piece rear cross-member providing an upper central support wall having a central hole therethrough and providing an upstanding rear wall at the back of said central support wall; a rear end portion of said rail member resting on said central support wall with said upstanding rear wall covering the rear end of the rail member and said central hole registering with said T-slot; front and rear bolts in said T-slot, each having an enlarged head confined in the cross-arm portion of the T-slot and having a shank extending through the leg portion of the slot, the front bolt shank extending downwardly through said central opening in the ledge and the rear bolt shank extending downwardly through said central hole in said central support wall, and said front and rear bolts having nuts threaded onto their shanks and bearing against the undersides of said ledge and central support wall; and a seat carriage slidably mounted on said rail member for travel between said front and rear cross-members.
Claim 2
Dependent Claim
270 words
In an exercise rowing machine: an elongated center rail member having front and rear ends and being formed along its underside with a T-slot having a leg portion exposed at its lower end and a cross-arm portion at the top of the leg portion; a one-piece front cross-member having a rearwardly facing central socket and a rearwardly projecting central ledge continuing from the bottom face of the central socket, said central ledge having a central opening therethrough, a forward end portion of said rail member resting on said ledge and extending into said central socket with its T-slot registering with said central opening; a one-piece rear cross-member providing an upper central support wall having a central hole therethrough and providing an upstanding rear wall at the back of said central support wall; a rear end portion of said rail member resting on said central support wall with said upstanding rear wall covering the rear end of the rail member and said central hole registering with said T-slot; front and rear bolts in said T-slot, each having an enlarged head confined in the cross-arm portion of the T-slot and having a shank extending through the leg portion of the slot, the front bolt shank extending downwardly through said central opening in the ledge and the rear bolt shank extending downwardly through said central hole in said central support wall, and said front and rear bolts having nuts threaded onto their shanks and bearing against the undersides of said ledge and central support wall; and a seat carriage slidably mounted on said rail member for travel between said front and rear cross-members.
Claim 3
Dependent Claim
33 words
In an exercise rowing machine according to claim 1, said rear cross-member having an integral key extending upwardly into the leg portion of said T-slot with said leg portion serving as a keyway.
Claim 4
Dependent Claim
36 words
In an exercise rowing machine according to claim 1, said front and rear cross-members each having an integral key extending upwardly into the leg portion of said T-slot with said leg portion serving as a keyway.
Claim 5
Dependent Claim
32 words
In an exercise rowing machine according to claim 1, in which said front cross-member has a bottom ridge between said end sockets with grooves therealong to interfit with a flexible anti-skid strip.
Claim 6
Dependent Claim
157 words
In an exercise rowing machine, an elongated, front cross-member having front and rear sides, said front cross-member being formed integrally with: a rearwardly facing center support ledge for receiving the forward end of a longitudinal center rail adapted to have a seat carriage roll therealong; a pair of end sockets near the ends of the cross-member for receiving the forward ends of a U-shaped frame member connected to the center rail; a pair of clevises directly above said end sockets for pivotally receiving a pair of cylinder units connected to the U-shaped frame member; and a pair of rearwardly facing saddles positioned between said center support ledge and said end sockets for receiving a shaft extending along said cross-member from said saddles forwardly of said center support ledge for pivotally mounting a pair of foot plates at opposite sides of the center rail, with the forward end of the center rail retaining said shaft in said saddles.
Claim 7
Dependent Claim
157 words
In an exercise rowing machine, an elongated, front cross-member having front and rear sides, said front cross-member being formed integrally with: a rearwardly facing center support ledge for receiving the forward end of a longitudinal center rail adapted to have a seat carriage roll therealong; a pair of end sockets near the ends of the cross-member for receiving the forward ends of a U-shaped frame member connected to the center rail; a pair of clevises directly above said end sockets for pivotally receiving a pair of cylinder units connected to the U-shaped frame member; and a pair of rearwardly facing saddles positioned between said center support ledge and said end sockets for receiving a shaft extending along said cross-member from said saddles forwardly of said center support ledge for pivotally mounting a pair of foot plates at opposite sides of the center rail, with the forward end of the center rail retaining said shaft in said saddles.
Claim 8
Dependent Claim
28 words
In an exercise rowing machine according to claim 5, in which said center support ledge has an opening therethrough for receiving a fastener depending from the center rail.
Claim 9
Dependent Claim
42 words
In an exercise rowing machine according to claim 5, in which said front cross-member also has integral stop walls located between said pair of saddles and said pair of clevises for giving endwise confinement to a shaft occupying said pair of saddles.
Claim 10
Dependent Claim
47 words
In an exercise rowing machine according to claim 5, in which said front cross-member also has integral stop flanges projecting rearwardly below said pair of saddles to limit downward movement of a pair of foot pedals pivotally mounted on a shaft received in said pair of saddles.
Claim 11
Dependent Claim
37 words
In an exercise rowing machine according to claim 5, in which said front cross-member provides a second pair of saddles aligned with said first-mentioned pair of saddles and located between the latter and said center support ledge.
Claim 12
Dependent Claim
62 words
In an exercise rowing machine according to claim 9, in which said front cross-member also has integral stop walls located between said first-mentioned pair of saddles and said pair of clevises for giving endwise confinement to a shaft occupying said pairs of saddles, said first-mentioned pair of saddles being spaced from said stop walls and said second pair of recesses by gaps.
Claim 13
Dependent Claim
29 words
In an exercise rowing machine according to claim 5, in which said front cross-member has spaced side supports for receiving a transport wheel shaft directly forward of said sockets.
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) | 1991-04-12 | 1991-10-12 | 1992-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-12 | 1995-10-12 | 1996-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-12 | 1999-10-12 | 2000-04-12 | $7700.00 | Window Closed / Lapsed |