Abstract: A muzzle break which directs propelling gases rearward and upward to reduce both recoil and muzzle jump. The gases are redirected by curved vanes which extend from a tapered central bore whose diameter decreases in the shooting direction.

Abstract: A saw blade for cutting a slot in a workpiece has two toothed sections, one at either end of the blade. The two sections lie in different—preferably perpendicular—planes. A slot is formed in a workpiece by first cutting one side of the slot with the toothed section at the front of the blade, and then cutting the bottom of the slot with the toothed section at the rear of the blade. A untoothed section between the two sets enables one to transition between the cutting directions, without having to turn the saw.

Abstract: Spherical articles such as breath mints are released one at a time from a container by depressing a button, which simultaneously opens a first flow regulator and closes a second flow regulator in series with the first. When the button is released, the first flow regulator opens and the second flow regulator closes. The first flow regulator is preferably a pair of opposed weirs, and the second flow regulator is preferably a pair of parallel pillars.

Abstract: Spherical articles such as breath mints are released one at a time from a container by depressing a button, which simultaneously opens a first flow regulator and closes a second flow regulator in series with the first. When the button is released, the first flow regulator opens and the second flow regulator closes. The first flow regulator is preferably a pair of opposed weirs, and the second flow regulator is preferably a pair of parallel pillars.

Abstract: A chair has a seat back with removable front and rear upholstered covers. The covers are held to the back by hidden release levers which prevent unauthorized removal of the covers.

Abstract: A closure for a beverage bottle contains a valve which one opens by sucking on a spout or nipple extending from the closure. The valve is normally closed, so the beverage is safely contained even it is a carbonated beverage at superatmospheric pressure. The valve is moved to its open position by a diaphragm exposed to atmospheric air on one side and to the suction on the other side. Once beverage begins to flow, the valve provides a pressure-regulating function to control the flow rate.

Abstract: A chair has a seat back with removable front and rear upholstered covers. The covers are held to the back by hidden release levers which prevent unauthorized removal of the covers.

Abstract: A can opener that has a circumferential support member that is manipulable by a user for axial rotation about a can. The circumferential support member has generally curved inner surface generally corresponding to the shape of the can. A cutting blade is mounted to the circumferential support member and includes a shearing portion configured for shearing at least a shearable portion of a can wall of the can against an opposing portion of the can that faces substantially axially, upon the axial rotation of the circumferential support member about the can.

Abstract: A golf driver head has a double-walled hosel contained wholly within the head. The hosel includes an inner tube into which a club shaft may be inserted, and an outer tube situated around the inner tube and having a clearance defining an annular space between the inner tube and the outer tube. An annular bridge extends across the annular space, interconnecting the inner tube and the outer tube, and the space between the inner and outer tubes is filled with an elastomeric damping material.

Abstract: A variable pitch boat prop includes a hub fixed to the prop shaft, a sleeve surrounding the hub and having bearings which receive stub shafts from a plurality of blades. The stub shafts pivot in the bearings, so that the blade pitch can change. Pinion teeth formed on the stub shafts mate with respective toothed racks fixed to the hub and disposed at an acute angle to the hub axis. The center of pressure of each blade is offset downstream from the stub shaft axis, so that dynamic pressure on the blades tends to decrease blade pitch, while the rack and pinion tend to increase blade pitch. These opposing moments are at equilibrium at different blade pitches, according to the speed of the boat and the prop shaft torque. Blade pitch increases automatically as speed increases, and decreases at load increases.