Abstract: A chain tensioning device comprises a pair of arms 2, 3 which are pivoted together and urged apart, so that the arm 3 applies a tensioning force to a chain, by means of a block 9 biased by a compression spring 10 axially along the arm 2 in conjunction with links 14 coupled between the block 9 and the arm 3 and serving to pivot the arm 3 relative to the arm 2, in response to such spring biased axial movement of the block 9. A catch disc 12 and rod 6 arrangement is provided to prevent return movement of the spring loaded block 9 and hence collapse of the arm 3 under load reversals of the chain.

Abstract: A chain tensioning device comprises a pair of arms 2, 3 which are pivoted together and urged apart so that the arm 3 applies a tensioning force to a chain by means of a spring loaded cam block 5. A catch disc 9 and rod 8 arrangement is provided to prevent return movement of the spring loaded block and hence collapse of the arm 3 under load reversals of the chain.

Abstract: A locking mechanism for use in a tension providing device. The tension providing device has a first shaft with a threaded end portion disposed within the interior of a cylindrical casing and a second end with a slit groove formed therein. A second shaft of the tension providing device has a threaded end engaged with the threaded end of the first shaft and an end protruding from the casing for providing tension. Rotation of the first shaft by a spring results in translation of the second shaft with respect to the casing. The locking mechanism includes a stopper pin removably secured in a lid of the casing at a position spaced from the axis of the first shaft. The pin is movable into engagement with the slit groove to lock the first shaft.

Abstract: A belt tensioning apparatus for tensioning a belt that extends between a driving shaft and driven shaft which are immovably supported with respect to one another. There is a flat spring, the free end of which bears against one run of the belt at a point between the two shafts. The opposite end of the spring is rigidly fixed so as to orient the spring within the plane of the belt such that the spring elastically deflects the belt run into a taut condition. A second leaf spring supported for cooperation with another belt run. Plural flat springs backing up the first mentioned springs for increasing the force applied thereby to the belt runs.

Abstract: A wire guide is mounted with a bottom bracket at a bicycle and has a guide body having a guide groove, a support extending from the guide body axially of the bottom bracket, and a fixture narrow in width and of a circular arc shape, the fixture being provided in continuation of the extending end of support and approximately perpendicular thereto, so that one threaded bearing tubular member is screwed with one axial end of the bottom bracket to thereby fix the fixture thereto.

Abstract: A bumper structure for a vehicle or the like, having a relatively long extension and retraction travel whereby the bumper may be sufficiently extended when the vehicle is in motion to provide a relatively very large shock or impact absorption, the structure readily being capable of extension for example, of 20 inches or more, and capable of being designed to provide a progressive shock absorbing action of widely varying characteristics. The construction is such that relatively long extension and retraction may be achieved in a structure taking up relatively little if any greater longitudinal space than conventional bumper structures, and even less space than many of the "so-called" shock absorbing bumpers now being introduced, which results are accomplished by the use of chain structures which are rigid in compression but which may be passed around cooperable sprockets whereby unextended portions of the chains may extend transversely to the longitudinal axis of the vehicle.

Abstract: The guard retains the cable on a pulley of a cable control system that indes another pulley mounted on a pivotable radius arm for swingable movement relative to it. Usually, the swingable pulley is linked to a third pulley mounted on a hinged structural member which itself swings with the radius arm to and from `closed` or `open` positions. When the arc is wide, i.e. around 180.degree., conventionally mounted guards engage and bind the swinging cable. The present guard is an elongate member pivotally mounted on the radius arm. In the `closed` position, a retaining flange formed on the guard moves for cable retaining purposes into close proximity with the fixed pulley and the proximity or clearance can be adjustably fixed and locked by an eccentric stop. During the `opening` swing, the cable engages the guard which then pivots sufficiently to prevent the undesired binding. The pivotal range of the guard is restricted by a pin and slot arrangement.

Abstract: A front derailleur for a bicycle is of the link type and comprises four members of a fixing member, two linkage members and a movable member, one of the four members carrying a chain guard for preventing a driving chain from coming off a front gear. The chain guard comprises a mounting plate for mounting to one of the four members and at least one guard plate for preventing the chain from coming off of the gear.