Abstract: A catmaran has a U-shaped mast, and either a triangular lateen sail, or a four-sided lug sail, and provisions for rowing, allowing the catamaran to be propelled either by sails or by oars.

Abstract: A cylindrical spacing ring spaces apart bicycle chainrings. The cylindrical spacing ring preferably encompasses a plurality of threaded fasteners which secure the chainrings to a bicycle crankarm means.

Abstract: A bicycle workstand is mounted to a support structure, such as a wall or post. The workstand includes a handlebar support, which has two spaced-apart, concave-upward nests for supporting the bicycle's handlebars, and a saddle engagement means, mounted above, which positions the bicycle saddle in close proximity to the support structure.Thus, the bicycle is mounted vertically with its wheels extending out from the support structure, with the front wheel above the floor, free to turn, and with the center of the rear wheel at about eye level.The bicycle workstand can also serve as an economical storage rack.

Abstract: A bicycle crank arm has an internal flange with a plurality of mounting holes for receiving mounting fasteners. The internal flange allows the crank arm to be wider, which lends it to being cast out of a light alloy, such as magnesium or aluminum, producing a stronger and more rigid crank arm of reduced weight. Also, the mounting fasteners and the internal flange are hidden from sight, enhancing the appearance of the crank arm.

Abstract: A headset for bicycle having external forks. The headset allows the use of small standard sealed radial ball bearings, and allows for easy fork replacement by removing and replacing only two screws. Ball bearings with outer and inner races are inserted into bearing bores of the head tube of a bicycle frame. A pair of internally threaded bushings insert through the bearing inner races and are drawn together by a stud. Fasteners, such as screws, insert through mounting holes in spaced-apart mounting brackets of the external forks and engage the two bushings to secure the forks to the headset.

Abstract: A bearing seal device seals the end of a ball bearing mechanism having an inner race engaging a cylindrical shaft, a plurality of balls, and an outer race. A flat elastic sealing ring abutts the inner race, which is inset, and bears against a sealing surface of the outer race. A circumferential seal engages and forms a seal on the shaft and abutts and forms a seal with the sealing ring. A bias means presses the circumferential seal against the sealing ring, which is deformed into a cup shape, and forms a seal with the sealing surface of the outer race.

Abstract: A freewheel mechanism for bicycles includes a side plate which is easily removed, allowing a sprocket to be quickly replaced without removing the body of the freewheel mechanism from the hub of the bicycle. Since they are not needed in racing, and to facilitate sprocket changes, ball bearings are not used. In the usual manner, a pawl means, and a pawl spring means are disposed between the sprocket and the freewheel body, allowing the sprocket to turn one way only in relation to the freewheel body.

Abstract: A pantograph guide pulley mechanism directs a bicycle chain onto a selected rear sprocket. A floating take-up pulley is linked to a resilient rod to provide chain tension and to take up and play out chain as required.

Abstract: A locking key prevents a slotted boss, which is secured to a spindle by a pinch bolt, from working its way off the spindle, or, in some cases, from twisting excessively in relation to the spindle.The locking key is positioned within the slot of the boss, has a hole which the pinch bolt goes through, and has a tang which engages a hole in the spindle, thus forming a loose link between the spindle and the pinch bolt. An anti-rotation tab of the locking key prevents the locking key from rotating about the pinch bolt, and prevents the tang from coming out of the tang hole in the spindle. To remove the boss, the pinch bolt must be withdrawn. The device is applicable to splined, serrated, keyed, or cylindrical spindles mounting corresponding bosses.

Abstract: A two-piece crankshaft for a bicycle having a chain drive. One crank arm is welded to one end of a tubular, cylindrical spindle having a spline at its other end. The other crank arm is welded to an internally-splined boss which engages the splined end of the spindle. A pinch bolt secures the splined arm. A sprocket mounting pad having a threaded central mounting hole is welded intermediate the ends of one of the crank arms. A conventional bicycle sprocket having a central hole and a radially located driving slot slips onto the crankshaft spindle, abutts the mounting pad, and is secured to it by a bolt. The spindle is mounted in ball bearings inserted in bearing bores of the bicycle frame, and spacers are disposed between the crank arms and the bearings to position the two arms away from the frame.

Abstract: A chain engagement slot for bicycle sprockets, which enables a bicycle chain to be shifted from a smaller sprocket to a larger sprocket mounted next to it on a common cluster body. The chain partly enters the chain engagement slot, causing sufficient contact between the chain and the next sprocket tooth to enable the chain to be seated on the larger sprocket.

Abstract: An outboard ball bearing support for a bicycle pedal having a pedal spindle with an open, tubular outboard end. A shoulder bushing inserts into the open end of the pedal spindle. A drawbolt member having a head portion slips through the ball bearing's inner race, passes through the shoulder bushing, and engages internal threads in the pedal spindle near its inboard end. The drawbolt secures the bearing inner race and the shoulder bushing to the open end of the pedal spindle.