Abstract: A rotary cutter, in the nature of a milling cutter, especially for agglomerated foam plastic, has a body with a concentric surface of revolution onto which are brazed block-like carbide cutting elements. The cutting edges of circumferentially adjacent cutting elements lie on lines spaced apart circumferentially by between 0.60 in. (15 mm.) and 0.165 in. (17 mm.), and the kerfs of such cutting elements overlap. The cutting elements are received in shallow axially extending grooves in the body; their axial locations are established by reference to lines scribed around the body at uniform axial intervals.

Abstract: The rotor of a disc brake apparatus for bicycles comprises a spider that flatwise overlies the outer face of one spoke flange on a wheel hub and is secured by spokes that have their hook portions extending through it and that spoke flange. A flat annular disc has radially inwardly projecting tabs that are secured to the spider and hold the disc in axially spaced relation to the spokes. A U-shaped caliper body straddles an edge portion of the disc. On a shorter leg the body has a fixed brake pad; on its longer leg it carries a movable brake pad that has a compound motion for self-energization. The body is movable in directions parallel to the wheel axis and is carried, in part, by a cup-shaped adapter coaxial to the wheel shaft and confined between a bearing cone for the wheel and an adjacent frame portion. Portions of the body straddle an elongated frame member to confine the body against rotation around the adapter.

Abstract: A pair of telescoped inner and outer tubes together provide a post-like handle that is mounted on the gunwale of a boat. The outer tube is fixed to the top of the gunwale and projects down through a hole in the gunwale, and the inner tube which forms the actual handle slides in the outer tube between a lowered inoperative position beneath the gunwale to a raised operative position standing erect and rising to a convenient height above the gunwale. A spring-pressed latch moves with the inner tube and snaps into an annular groove that is fixed with respect to the outer tube and located directly above the gunwale, to secure the inner tube against either upward or downward movement. A resiliently manually actuated loop located in the annular groove enables the latch to be dislodged from the groove when it is desired to lower the handle.

Abstract: In an electric motor having an external motor cooling fan mounted outboard of one of its rotor shaft bearings, the cup-shaped enclosure for said fan conventionally has its side wall radially spaced from a part of the frame to cooperate therewith in defining an annular outlet through which air from said fan is guided axially across the motor exterior, all around the same. According to the invention, that outlet is substantially blocked, as by an arcuate air barrier strip, to convert the fan enclosure into a plenum chamber from which pressurized air is forced through the motor interior for substantially greater cooling effectiveness.

Abstract: End portions of the choke valve shaft project outside the carburetor mixing passage duct. One end portion is connected with an actuator mechanism that is responsive to either engine speed or manifold pressure. The other projects into a cylindrical chamber on the carburetor body that houses a spirally coiled bimetal strip having its inner end connected with the shaft, its outer end engageable with circumferentially spaced abutments. The chamber is communicated with the crankcase breather and also with the mixing duct through a flapper valve, so that the bimetal is subjected to the temperature of vented crankcase vapors.

Abstract: A funnel securable to the uncovered top of a receptacle containing dry pulverized material is provided with an encircling skirt which coacts with the funnel to define a relatively closed zone encompassing the discharge mouth of the funnel. A hole in the skirt near its junction with the funnel enables that zone to be connected with a source of suction, so that upon inversion of the receptacle to which the funnel is secured, an open-topped container placed in said zone beneath the discharge mouth of the funnel can be filled with dry pulverized material from the receptacle without creating an objectionably dusty environment.

Abstract: In an apparatus to hold and transport a drum, by gripping its chime, a gripper bracket to hold a drum, being installed with the main gripping and releasing mechanism to play the leading role, is suspended by a lifting bracket through a spring and also supported vertically freely through a pin-elliptical hole joint.The mechanism, to play the leading role, consists of a gripper bracket, a pair of gripping levers, each of which having a gripper jaw to grip a chime of a drum and a connecting lever, being pin jointed with each other to make a quadrilateral link mechanism.

Abstract: A security locking device for dead-bolt door locks which is distinguished by a shroud that encompasses and grips the dead-bolt actuator at the inside of the door, and is rotatably mounted in a base secured to the inner face of the door, with a handle portion on the shroud exposed to enable the shroud -- and hence the dead-bolt actuator -- to be manually turned. A spring biased security bolt slidably mounted in the base engages a cylindrical side surface of the shroud and snaps into a keeper recess in that surface when the shroud is turned to the position at which the dead-bolt is in its projected door-locking position. A manually rotatable cylinder with an eccentric lug at its inner end to engage one or the other of a pair of opposing shoulders on the security bolt is mounted in the base and operable from inside the door to enable retraction of the security bolt and to selectively hold the security bolt in either its projected operative position or its retracted inoperative position.

Abstract: Driverless vehicles move in one direction along a path divided into blocks. Movement command signals are radiated from plural elongated radiators per block, arranged end-to-end, the last in each block a departure radiator wholly within the block. A receiver in each vehicle comprises a memory element established in active condition by a momentary "clear" signal and maintained in active condition by a continuous succession of movement command signals. A departure radiator emits no movement command signals while the block directly ahead of it is occupied, but it emits a "clear" signal and continuous movement command signals when that block is safe for entry. Only departure radiators emit "clear" signals; hence, a vehicle which slides into an occupied block cannot continue moving in that block.

Abstract: A concrete transporting and placing vehicle wherein the frame of the material receiving body is slidably seated on a sub-frame that is fixed to the chassis of a truck, for movement by a hydraulic cylinder, about a fixed vertical axis, either to the left or the right, from a centered transport position aligned with the truck chassis to a diagonal discharge position in which the material discharge mouth at the rear of the body is at one side or the other of the vehicle; depending upon whether the body frame was shifted to the left or the right; and wherein upon return of the body frame to its transport position, a locking pin automatically engages to releasably hold the body frame in its transport position, the locking pin being automatically retracted to release the body frame for movement from its transport position, concomitantly with pressurization of the cylinder to effect such movement.

Abstract: A pincer-like tool for attaching a selected slotted plastic head to the shank of a key and for detaching the head therefrom. The tool has a pair of pivotally connected members, one of which provides the body of the tool and has opposite flat-surfaced sides, each of which is designed to receive and hold a slotted plastic head in position to have the shank of a key forced into its slot or expelled therefrom -- depending upon which of the two sides of the body the head is placed on -- by the advance of a carriage that is slidably mounted on the body; the other one of the pivotally connected members being a short and long armed bell crank lever having its short arm drivingly connected with the carriage and its long arm overlying a handle on the body to form a pair of pincers which, upon being gripped and squeezed together, advance the carriage.

Abstract: A wide beam floodlight fixture by which the light from a lamp bulb that radiates light in all directions away from its axis, directs that light in a wide well defined beam. The fixture comprises a housing with a transparent front wall, and opposite opaque top, bottom and side walls. A curved reflector in the rear of the fixture housing embraces the lamp bulb and directs its light out of the transparent front wall. The top and bottom walls of the fixture have aligned access ports through either of which the lamp bulb may be removed and replaced. A socket housing removably attached to the bottom wall of the fixture housing closes the bottom access port and has the socket for the lamp bulb base shock-resistantly mounted therein. The access port in the top wall of the fixture housing is closed by a removable cover, from the underside of which a flanged ring is resiliently supported to embrace the upper end portion of the lamp bulb.

Abstract: An electric strike type door lock in which the strike tongue is releasably held in its latch bolt securing position by a ball seated in a bore in a wall of the housing in which the strike tongue is mounted. Toggle linkage holds the ball in an operative position projecting from the mouth of the bore and into a pocket in the adjacent surface of the strike tongue, when the toggle linkage is in an extended condition with its knee joint slightly across dead center. A low powered solenoid operatively connected with the knee joint of the toggle, initiates collapse of the toggle and thereby enables the ball to be expelled from the pocket in the strike tongue by door opening force transmitted through the latch bolt onto the strike tongue.

Abstract: A small gasoline engine with a relatively inaccessible crankcase oil fill port is equipped with an elongated funnel member having its bottom sealingly secured in that port. A removable cap for the funnel member comprises a suction chamber having a transparent side wall and the interior of which is communicated with a depending tube that has its bottom end at the prescribed minimum oil level. With adequate crankcase oil, depression and release of a downwardly displaceable, upwardly biased top wall of the suction chamber draws oil into it to be visible through its transparent wall. The interior of the transparent wall is cleaned of residual oil by a wiper moving in unison with the displaceable wall.

Abstract: A rotary cutter type key cutting machine for duplicating keys in which the V-shaped notches that define the bitting are obliquely oriented both left and right. Identical vises mounted on a hinged carrier which swings about an axis parallel to that of the rotary cutter, grip the pattern key and the key blank and present the same respectively to a position-identifying stylus and the rotary cutter. The vises are rotatable in unison about their connections with the carrier, permitting them to be so oriented that as the carrier is swung towards the axis of the cutter, the bitted and about-to-be-bitted edges of the pattern key and the key blank are either parallel to the cutter axis or inclined with respect thereto in one direction or the other depending upon the direction the vises have been rotated.

Abstract: A rotary power mower in which the cutter blade is fixed to the bottom of a cup-shaped rotor, freely rotatably suspended from a carriage that is slidably mounted for fore and aft movement beneath the deck of the mower chassis. The carriage is spring-urged to a position in which the outer face of the side wall of the cup-shaped rotor is frictionally engaged with a brake shoe fixedly carried by the mower chassis, to hold the cutter blade against turning; and a deadman control mounted on the handle of the mower and operatively connected with the carriage enables the operator to move the carriage against the force of the spring to a position in which the inner face of the side wall of the cup-shaped rotor is tangent to and frictionally engaged with the periphery of a drive wheel fixed to the engine drive shaft.

Abstract: A combination clutch and brake for rotary power mowers of the type wherein the blade is fixed to a spindle driven by the engine through an endless belt type drive transmission. A medially pivoted lever has an idler roll at one end to engage and tension the belt and thereby activate the drive transmission when the lever is rocked in one direction and a claw at its other end which, upon movement of the lever in the opposite direction, engages the notched periphery of a brake disc encircling the blade spindle and frictionally engaged with a companion disc that is fixed with respect to the spindle. The lever is spring-biased in the direction to engage the brake disc and thereby stop blade rotation concomitantly with deactivation the drive transmission whenever a deadman control on the mower handle is released.