Abstract: A proportional speed control arrangement (100) is disclosed for use with vehicles requiring variable velocities of operation. Specifically, the arrangement is utilized with a traction motor apparatus (101) to provide velocity adjustments to a service type of vehicle via electronic circuitry responsive to signals generated from an interface controller (102). The interface controller (102) comprises acceleration switches (KI, KD) and an enabling switch (KE) which are responsive to activation thereof by external means to establish velocity command signals. The velocity command signals control the application of energizing signals to the motor apparatus. A requisite velocity is maintained by deactivation of the acceleration switches while correspondingly maintaining activation of the enabling switch.

Abstract: A solid fuel burning stove (10) includes a firebox (11) having an insulated bottom chamber in which fuel is burned. The bottom chamber includes an insulated bottom surface (72) and walls (18, 20, 22, 24) which provides for heat retention when fuel is burned therein thereby creating high temperatures. The bottom chamber of the firebox (11) is divided from a top chamber by a horizontally extending baffle (46) which directs flow of exhaust gases from the bottom to the top of the firebox (11). The exhaust gases are burned in the top portion of the firebox (11) by means of the heat generated within the lower chamber and the introduction of fresh combustion air. This fresh combustion air is drawn in through an orificed pipe (49) extending along the length of the firebox.

Abstract: A metal heat recuperation wheel (12) wherein a number of structural metal spokes (38) extend radially from the core (22) through or along the metal heat exchange medium (36) into a heavy metal rim (30) to provide thermal stability necessary for gap seals (18, 20) on the rim and face of the wheel.

Abstract: A pendulously supported proof mass accelerometer wherein a pulse generator applies periodic pulses to a bridge circuit comprising variable resistors and pick-off capacitors to generate a restoring current to maintain the proof mass in a null position. The variable resistors of the bridge circuit provide a means of varying the null position of the proof mass to achieve substantially balanced linear operation of the accelerometer circuitry. A bias compensation circuit applies a correction current to an output circuit which is equal in magnitude and opposite in direction to output current produced by static bias factors of the accelerometer.

Abstract: Wire tensioning apparatus comprises a holder for a reel of wire and first and second tensioning elements arranged to be supported adjacent one end of a held reel. Each tensioning element has at least one annular surface, the annular surfaces on the two elements co-operating to define a non-linear circular passage along which a wire may pass generally radially inwardly, the wire entering the passage at any point in the 360.degree. arcuate extent of the passage. One element has a central aperture, so that wire may spill off a held reel, enter the non-linear passage and leave through the central aperture, tension being imparted by the wire following a zig-zag path as the wire passes through the passage.

Abstract: A workbench filtering station (10) includes a generally open interior in which a plurality of filter bags (50) are disposed to partially clean a gas stream. The gas stream is communicated to the bag filters (50) through an air intake (46). The air intake (46) is in the form of perforations in the side walls (44) of the filtering station (10). The station (10) includes HEPA-filters (60) which receive the partially-cleaned air from the bag filters (50). The HEPA-filters (60) clean the air to a clean-room environment. A fan (30) draws a constant volume of air through the filtering station (10) and exhausts the clean air into the room. In operation, a constant volume of air is drawn into the filtering station through the side intake panels. The air is communicated to a first filter station which is in the form of bag filters. The air is then passed through a HEPA-filter stage for further cleaning and exhausted to the room.

Abstract: A seaming machine for securing a batten to a roof rib includes a housing (24) having two longitudinal sections (25, 29) which are pivotably secured together about a vertical axis. A cam locking arrangement is provided at the rear of the housings to lock the housing sections (25, 29) together when the machine is positioned on a roof rib. The cam locking arrangement includes a pair of vertically spaced cams (102, 104) which engage a pin (50) disposed in one of the housing sections (25). The seaming machine comprises three pairs of horizontally disposed rollers (52, 54, 56) which progressively bend a flange on a batten against a roof rib, with the rollers engaging the sides of the roof rib to drive the machine along the rib. Vertical pinch rollers (76) are provided between the second and third stage horizontal rollers (54, 56) to crimp the flange on the batten against the roof rib. In this way, a secure and waterproof connection of the batten to the roof rib is provided.

Abstract: A leaf spring suspension assembly (12) for a truck or trailer (18) includes a plurality of leaf springs (20) arranged in a vertical relationship. The leaf springs (20) are mounted to a vehicle through a trunnion assembly (28) which permits for flexure of the ends of the springs (20) to which wheels (16, 18) are attached. The ends of the leaf springs (20) are mounted in an axle connection (26) comprising a housing. The lower leaf (64) of the leaf spring assembly (20) is seated against a base plate (52) of the axle connection (26) and is restrained against movement relative thereto by pairs of pins (90) or cups (72) disposed between the spring (64) and the base plate (52). Cups (74) or pins are also disposed between adjacent springs of the leaf spring assembly (20) to restrain longitudinal movement therebetween.

Abstract: A top access cabinet (12) includes a cover (18) pivotably mounted thereto by a hinge and lever arrangement which permits the cover to pivot and slide with respect to the cabinet so that the cover can drop behind the rear wall of the cabinet when the cover is opened. Hinges (54) mount the cover (18) to the cabinet (12) along the rear wall (22) of the cabinet (12). Elongate slide members (60, 62) supported by the hinges (54) slidably mount channel members (56, 58) secured to the underside of the cover. Lever arms (32) disposed on each side of the cover (18) are mounted between the side walls (24, 26) of the cabinet and the cover. When the cover is raised, the lever arms (32) displace the cover (18) relative to the cabinet so that the channel (56, 58) members slide over the slide members (60, 62).