A tamper evidence device for a secure housing containing electronic circuits includes a zinc air cell and a bi-stable latch circuit connected to be powered by the cell. The zinc air cell requires a supply of oxygen for activation of the cell. Normally when the secure housing is intact and unbreached, a pad seals an aperture for ingress of oxygen to the cell and the cell does not generate any electrical power. However if the secure housing is opened or otherwise breached the pad is displaced and ...

Device for tamping the earth including two vibration systems each consisting of a pair of upper and lower driving rods and a spring mounted between the rods. Each of said upper driving rods is driven by the engine through a crank means so that they reciprocate alternately with each other. The movement of each of the upper driving rods is transmitted to the corresponding lower driving rod through said spring so that foot plates installed respectively at the lower end of each of the lower driving ...

A tamper-detection switch is built into a device such as an encoder for a gas or water meter. The switch has a contact arm biased to complete an alarm circuit, but this is prevented by a restraining post. On installation, an actuator is moved by contact with the meter to lift the contact arm free of the restraining post, at the same time restraining the arm from completing the circuit. If the encoder is subsequently moved away from the meter, a biasing spring causes the actuator to move out of t...

A vertically movable tamping head includes a pair of ballast tamping tool implements arranged for reciprocation in the direction of track elongation towards and away from each other. Each implement includes a rigid mounting support comprised of a vertically extending support arm in vertical alignment with a respective track rail and mounted for pivoting about an axis extending in the direction of the cross ties, a pair of wings extending transversely of the track symmetrically with respect to th...

A vibrating tamper with side-by-side engine section and tamper section connected by a suspension system including leaf springs. The tamper section includes a reciprocating leg terminating in a tamping plate. The engine section includes handles, an engine with a rotary drive shaft, and a transmission for converting the drive shaft rotary motion to reciprocating motion to be imparted to the tamper. A driven, eccentrically mounted roller cooperates with a lever forked at one end to embrace the roll...

Sheet alignment apparatus which registers a stack of sheets accurately and rapidly in a tray. A vibrating tamper member is moved into and out of contact with a stack of sheets urging the stack against a stop member momentarily before being withdrawn from the stack to effect alignment of the edges of the stack.

A plate adapted for being fixed to the end of a tamper arm and having a groove extending across the leading edge and up the side edges and in which blocks of a hard wear resistant material, such as a cemented hard metal carbide, are mounted and secured in place as by brazing.

A hand-guided vibration tamper, which is driven by a motor laterally cantilevered on the tamper head, is provided with guard plates covering its underside and lateral sides. The underside and lateral guard plates are connected to a housing for the motor, and the underside guard plate is fastened near its free end to the motor and/or an air circulation hood for the motor. Preferably, the underside guard plate is a thick-walled aluminum plate screwed together with the lateral guard plates and exte...

A tamper for a baler, as for waste paper, which includes a plunger movable downwardly into an auxiliary compression space above the compression space for the baler forwardly of the platen. The feed chute extends to the top of a feeding space at one side of the auxiliary space, the feeding space having an inclined side, so that the baler may be operated either with or without the tamper. Controls for the tamper and baler include limit switches and maintain the plunger in down position until the b...

A tamping machine including a motor, a crank driven by said motor over an appropriate mechanical transmission, a linkage connecting the crank to a vertically reciprocating plunger disc, a tamping foot disposed beneath the plunger disc, a housing encasing the crank, linkage and the upper end of the tamping foot, a first set of springs for urging the tamping foot to move in response to movement of the plunger disc, and a second set of springs for damping the shock forces created within the machine...