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An exercise rowing machine has a tubular center rail of generally rectangular shape secured to underlying frame members by carriage bolts that have their head slide-mounted in a T-slot formed on the underside of the rail. The rail is formed with side channel tracks for the rollers of the seat carria

An exercise rowing machine has a tubular center rail of generally rectangular shape secured to underlying frame members by carriage bolts that have their head slide-mounted in a T-slot formed on the underside of the rail. The rail is formed with side channel tracks for the rollers of the seat carriage. End plates on the rail serve as travel stops for the seat carriage and are mounted by screws passing into longitudinal grooves formed on the inside of the rail. A timer is housed in the rail.

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1. In combination, an elongated, generally rectangular, tubular rail for an exercise rowing machine formed with outwardly opening channels at opposite sides to provide a laterally spaced pair of roller tracks, and formed at the bottom with an externally exposed, longitudinal T-slot open at the en

1. In combination, an elongated, generally rectangular, tubular rail for an exercise rowing machine formed with outwardly opening channels at opposite sides to provide a laterally spaced pair of roller tracks, and formed at the bottom with an externally exposed, longitudinal T-slot open at the ends for receiving the head and neck of bolts projecting from the rail to make connection with frame members, said rail having a longitudinal slot in its top wall extending from one end of the rail a minor part of the length of the rail, a seat carriage with rollers tracking on the tracks, a timer housed within said rail and having a shaft projecting through said slot, said shaft having a pointer knob on its free end; and rowing arm means operatively associated with said rail. 2. A combination according to claim 1 in which a cover member is secured to the top wall of the rail and covers said slot, said cover member having time-indicating indicia adjacent the pointer knob. 3. In an exercise rowing machine, a frame assembly including an elongated, generally rectangular, tubular rail member formed with laterally projecting roller guide tracks along its length for a seat carriage and formed with a longitudinal T-slot along its length which is exposed at the bottom of the rail member and has open ends; same frame assembly also including a bottom support frame unit beneath the rail member; bolts each having an enlarged head retained by said T-slot and having a shank passing downwardly through said support frame unit, said bolts being adapted to be inserted into said T-slot only at its open ends; and rowing arm means pivotally connected to said frame assembly. 4. In an exercise rowing machine according to claim 3, mounting plates provided by said support frame unit and having said bolt shanks passing through holes in the mounting plates; and nuts threaded onto said bolt shanks and engaging the underside of said mounting plates. 5. In an exercise rowing machine according to claim 3, front and back lateral members of tubular stock provided by said support frame unit; mounting plates fixed to the top of said lateral members and each having a pair of holes therethrough positioned forwardly and rearwardly of the respective lateral member, said bolt shanks passing downwardly through said holes; and nuts threaded onto said bolt shanks and engaging the underside of said mounting plates, whereby the rail member is secured to the support frame. 6. An exercising rowing machine comprising: a frame assembly including a ground support structure and a central, longitudinal hollow rail of extruded aluminum resting on said support structure and presenting a bottom longitudinal T-slot along its length; a seat carriage mounted to roll along said rail above said support structure; said ground support structure including a rigid frame which is generally rectangular in plan view and has fixed thereon front and back mounting plates each having a pair of holes therethrough; a respective pair of carriage bolts for each pair of holes, each bolt having its head retained in said T-slot and having its shank kept from turning by the T-slot and extending through the respective hole, said bolts being adapted to be inserted into the T-slot only at an end of the T-slot; and nuts on the bolts and bearing against the underside of the mounting plates; and rowing arm means pivotally connected to said frame assembly. 7. An exercise rowing machine according to claim 6 in which said frame is made of round tubular stock and said mounting plates are welded thereto, each mounting plate being of generally rectangular configuration and having one of its diagonals parallel to said rail, the respective pair of holes in each mounting plate being spaced apart along said one diagonal a distance greater than the diameter of said tubular stock. 8. In an exercise rowing machine: an elongated, generally rectangular, tubular rail member formed with outwardly opening, longitudinal channels at two opposite sides to serve as roller tracks, said channels each having top and bottom concave faces; a seat carriage straddling said rail member from above and having a set of convex rollers on each side tracking on said roller track between said concave faces for fully supporting the seat carriage; roller stops on the ends of the rail member covering the ends of the roller tracks; rowing arm means operatively associated with said rail; and a support frame beneath the rail member and secured thereto such that said seat carriage is free to roll along the roller tracks between said roller stops. 9. In an exercise rowing machine: a seat carriage with rollers; a frame assembly including an elongated tubular track rail formed with laterally spaced roller tracks supporting the rollers of the seat carriage and formed with a bolt-retaining T-slot along its length which is exposed at the ends of the member; said frame assembly also including a sub-frame means engaging the track rail; bolts retained by the T-slot and extending into the sub-frame means; and rowing arm means pivotally connected to said frame assembly. 10. In an exercise rowing machine: a seat carriage with rollers; a frame including an elongated tubular member formed with roller tracks at opposite sides supporting the rollers of the seat carriage, and formed with longitudinal grooves exposed to the inside thereof and having a circumference more than a halfcircle; an end plate on the member in the path of the carriage; screws passing through the end plate into one end of the grooves to secure the end plate to the member; and rowing arm means pivotally mounted on the frame assembly. 11. In an exercise rowing machine: a frame assembly including a tubular rail member formed along its length with a top wall, a bottom wall, a pair of side walls, a pair of track flanges at opposite sides, and a pair of retaining flanges at opposite sides; a seat carriage having a seat support frame straddling the rail member and supported by two pairs of rollers tracking on the track flanges and closely underlying the retaining flanges; said rail member also being formed with a T-slot along its length; said frame assembly including sub-frame means engaging said rail member at opposite sides of the T-slot; fasteners retained by the T-slot and connected to the sub-frame means, said fasteners being shaped to pass into the T-slot only through an end of the T-slot; and rowing arm means pivotally mounted on the top frame assembly. 12. An exercise rowing machine comprising: a frame assembly including a tubular rail member formed uniformly along its length with a top wall, a bottom wall, a pair of side walls, a pair of track flanges at opposite sides adjacent the bottom wall, and a pair of retaining flanges at opposite sides adjacent the top wall; a seat carriage having a seat support frame straddling the rail member and supported by two laterally spaced pairs of support rollers, one pair at each side of the seat support frame, which track on the track flanges and closely underlie the retaining flanges, said roller and track flanges interfitting to keep the seat carriage tracking in a straignt path relative to the rail member, and said retaining flanges keeping the carriage from separating from the rail members; said frame assembly also including ground support means secured to the rail member in engagement with said bottom wall and cleared by the seat carriage; foot rest means on the frame assembly near one end of the rail member; stop means near the other end of the rail member and blocking the travel path of the rollers; and rowing arm means pivotally mounted on the frame assembly.