An indexing head has a plurality of co-axial discs rotatable relative to each other. A first disc carries an indexing pin receivable in a series of equi-angularly spaced recesses of a second disc. A third disc is angularly settable relative to the second disc by means of gauge blocks, and is lockable after setting by locking means. A tool shank can be releasably held in an axial bore of the first disc. When used in an oil bath of an erosion machine, the head is fitted with a bellows skirt to pre...

The invention relates to an actuator device for a motor vehicle speed-responsive system, the device being operable to actuate the throttle valve or the like of the internal combustion engine of the vehicle. The actuator device comprises a bellows device defining a first chamber partly bounded by a movable wall and a fixed wall, and communicating with two further chambers defined by associated housings carried by the said fixed wall. One of the further chambers contains a first electro-magnetic c...

A device for aiding in the location of a person or object comprises a balloon connected by a valve to a container for a pressurized gas lighter than air, all of which are disposed within a casing in which a tethering line for the balloon is disposed and held closed by a releasable strap and lid which also holds the valve closed and which is operative to permit escape of the balloon and gas container from the casing whilst simultaneously opening the valve to admit gas into the balloon whereby the...

An orthodontic device comprises means defining a passage for an arch wire and means defining a tension spring for bearing against the arch wire. The tension spring has a free end portion for bearing against the arch wire and is fixed at its other end relative to the rest of the device. The tension spring locks against the arch wire to prevent relative movement of the arch wire to the device toward the other end of the spring and yields to the arch wire to permit relative movement of the arch wir...

A device for use in gripping a flanged structural member comprises a pair of gripping members pivotally connected together about a first axis for movement towards and away from one another, a screw threaded connection operable to urge the gripping members together to clamp a flanged member therebetween, and each of the gripping members being provided with a jaw having a recess to receive a flange of the flanged structural member, each jaw being pivotable about an axis parallel to the first axis.

A clamping device for clamping to a parallel sided support, e.g. a desk top or shelf comprises an elongate base on which is rigidly mounted a first arm. A second arm is slidable on the base and carries a screw which engages the rear face of the base to define a pivot axis. A second screw is manually rotatable to engage the base and pivot the arm about the pivot axis until the edge of the face plate engages the base to lock the arm in position. By suitable pre-setting of the screw the arm locks w...

The device is attached to one end of a driving ram located on a mining machine, and comprises a locking ram operable independently of the driving ram. The locking ram is used to force an abutment into locking engagement with an abutment portion in the track on which the machine runs. The device may also include a stop and a guide to ensure that the abutment and abutment portion remain engaged until the locking ram is used to force them out of engagement.

1. In a missile guidance system, that improvement which comprises, a missile having a rotatable section, a fin on the section adapted to rotate the section as the missile passes through the air and to steer the missile when the cone section is braked, an optical slit on the section, an electrical generator rotated by the section, means responsive to radiation from a target received by said slit to short the generator, thus providing a brake on the section so that the fin will steer the missile t...

A clamping device for gripping a blade or leaf of material and adapted to be operated with one hand. The clamping device includes two opposed walls carrying magnetic elements to lock the walls together as a result of magnetic attraction and to separate the walls in response to magnetic repulsion therebetween. A third wall pivotally connects the first two walls to permit pivotal and parallel movement of the first two walls with respect to each other.

An anchor useful for attaching articles to a member of predetermined width including a support section, a pair of arms extending from the support section, each arm extending to an end away from the support section, a retainer at each of the ends of the arms being affixed so that as the arms are pushed onto a member of predetermined width, the retainers force the pair of arms apart and when the arms are pulled off the member of predetermined width, the retainers tend to grip the member of predete...