Abstract: A positive parking brake for a vehicle with a transmission output shaft having a pair of gears rotatable thereon. A hub is fixed to the shaft between the gears and a clutch sleeve is axially slidably splined to the hub periphery whereby the sleeve and hub may be selectively coupled to the clutch teeth or either gear. A sleeve shifter fork has an opening therethrough whereby a braking pawl may be operated by a cam and spring device so as to extend through the fork opening to engage brake teeth on the sleeve periphery and brake the vehicle.

Abstract: A park-lock mechanism for a vehicle transmission having a rotatable gear held against rotation by a pawl movable in two directions and being free of a pivot mounting. The pawl has arcuate surfaces which are contacted by a control member, for moving the pawl in a direction radially of the gear, and there is a sliding support for the pawl and a tension spring for positioning the pawl relative to the gear. The force of rotation of the gear itself is transmitted to the pawl, after initial release of the pawl by the control member, and thus further force on the control member is only a minimal amount since the force from the gear assists the movement of the control member after that initial control member movement.

Abstract: Disclosed is a mobile rack system intended for an efficient use of a limited space of store house and the like for storing books and other goods, having a plurality of mobile racks adapted to run along rails laid on the floor of the store house. The system incorporates at least one human-power driven pedal-actuated driving source. The driving source may be provided for each of the mobile racks or may be provided independently of the mobile racks for running along separate rails. The driving source has a pair of pedals, at least a pair of driving wheels, speed reduction transmitting means between the pedals and the driving wheels, and a saddle for the operator to sit on, the position of which being switchable in accordance with the direction of movement of the rack or the tractor.Braking means are provided for preventing the mobile racks from moving unintentionally, thereby to avoid accidents due to the collision of racks.

Abstract: A brake pawl having a tooth engageable with brake gear means is mounted so as to be biased in a direction to disengage the tooth from the brake gear means. The brake pawl is formed at a side thereof opposite to another side facing the brake gear means with a first cam portion. A spring-loaded parking cam having at a portion engageable with the first cam portion a second cam portion is slidably mounted on a fork shaft which is parallel with the output shaft of the transmission. The axial movements of the fork shaft due to the movements of a manually operated shift lever cause the engagement and disengagement of the second cam portion with and from the first cam portion to accomplish locking and unlocking of the output shaft.

Abstract: A spring-loaded cam plate is pivotally mounted on an outer inclined surface of a brake pawl having at its inner surface a tooth, the cam plate being pivotable relative to the brake pawl along the outer inclined surface. A driver operable control rod is formed with a cut out portion forming an wedge surface including a large inclined first section near the bottom of the cut out portion and a small inclined second section. The first and second sections are selectively engageable with a free end of the cam plate upon axial movement of the control rod to urge the brake pawl to disengage from or engage with the parking gear.

Abstract: An automatic brake for wheeled carriages is characterized by U-shaped rod brackets, with integral out turned ears having brake rods slidable, and spring biased outwardly therein. The rods are preferably right angular so that identical brackets can be used for the telescopable finger grip actuating mechanism. In baby carriages the finger grip is spaced only for adult hands. In wheel chairs the brakes are released by the finger grip of the pusher or by a lever actuated by the leg of the occupant. In shopping carts the brakes are released by the finger grip of the pusher or by a lever actuated by the up-swing of the rearward nesting gate.

Abstract: A combination transmission neutralizer and power train interlock system is disclosed which is operatively associated with a vehicle power train and transmission gear shift lever, and which includes an actuator mechanism having a single operable position for simultaneously engaging the interlock with the power train and moving and retaining the gear shift lever in its neutral position.

Abstract: A vehicle wheel lock assembly for enabling the operator of a vehicle having a frame to lock one or more of the four wheels, at will, when the vehicle power is inoperative, which includes a normally retracted reciprocal locking rod mounted on and movable transversely of said frame adapted when advanced to interlock with a wheel. The normally retracted reciprocal actuating rod mounted on said frame for longitudinal movement. The control housing within the vehicle supports a control lever which projects from the housing and is operatively connected to the actuating rod for effecting selective reciprocal movements thereof. Gear mechanism on the frame interconnects the locking rod and the actuating rod.

Abstract: A transmission device for a vehicle comprises a common linearly movable selector rod for selecting the drive mode of the transmission and for actuating a parking brake. The driving mode is determined by a rack formed on the rod and engageable with a pinion, and the parking brake is actuated by means of a lever controlled by a cam carried by the rod.

Abstract: A walker to aid an invalid is disclosed. The walker includes a frame mounted on at least one wheel to allow the walker to roll along the floor. The frame and at least one wheel have coacting lock-catch-and-release means arranged such that when the user pushes down on the frame the lock will release and allow the walker to roll a measured, predetermined distance and thereat lock. Further movement is prevented until the frame is released and pressure again applied.

Abstract: A park-lock mechanism for a transmission having a rotatable gear and a double lug latch pivotally mounted adjacent the gear and having its lugs spaced apart a distance different from that of the spacing of the teeth on the gear, whereby one of the lugs will always align with the gear teeth spacing for securing the gear against rotation. The latch is also supported on a lever which is under the influence of a control mechanism including a cam and a spring and a control rod.

Abstract: Spring-biased longitudinally movable pin means are mounted to be engageable with circumferentially spaced recesses around the inside faces of non-pivoting casters that are, in turn, positioned under the mid-portion of a rollable service cart so as to provide for an automatic braking system for such cart. Cam means provided to retract the springbiased braking pins from the caster recesses and manually operated linkage means extending from each end of the cart to connect to said cam means provide for a cart operator stationed at either end of the cart to release the braking system and thereby permit movement of the cart.

Abstract: A transmission park-lock mechanism having a transmission shaft and a toothed gear thereon. A latch is mounted on a shaft adjacent the gear and engages the gear teeth for restraining the gear and the transmission shaft from rotating. There is a shaft and a lever and a torsion spring, all for positioning the latch into and out of engagement with the gear teeth.