Abstract: A hair trimmer has a shear blade assembly mounted in a frame and composed of a stationary blade and a reciprocating blade which slides on the stationary one. One or more biasing springs are interposed between the frame and the reciprocating blade to urge the same into proper contact with the stationary blade. A pivoted lever is interposed between the spring(s) and the reciprocating blade and serves to divert the biasing force to particular portions of the blades, such as the cutting edge, where it is needed while at the same time relieving other portions so that overall friction between the blades is reduced.

Abstract: Disclosed herein is a hair clipper including a housing, a motor located in the housing and including a shaft having a drive member thereon, and a blade set connected to the housing. The blade set includes a lower blade connected to the housing, and a movable blade assembly including a thin planar movable upper blade member and a shoe member including a planar body having a groove formed in its upper surface, a notch therein, and laterally spaced wall portions on opposite sides of the notch and extending upwardly from the upper surface. The movable blade assembly also includes a yoke member secured between the upper surface of the movable blade member and the shoe member, the yoke member including first and second laterally spaced walls extending upwardly through the notch and being engaged by the drive member to cause reciprocating movement of the movable blade assembly relative to the fixed blade.

Abstract: A hedge trimmer has at least one moveable blade and a second blade. The second blade has trapezoidal teeth. The first blade has rectangular teeth which have a broadened end portion, but, contrary to the prior art, the teeth of the first blade are at least twice as long as those of the second blade. As in the prior art hedge trimmers, the broadest part of each tooth is defined by two juncture points, one on each side of the tooth. For additional safety, in accordance with the invention, the maximum distance between adjacent juncture points of adjacent teeth is 14 mm.

Abstract: A hair trimming head for slow rate hair trimming and thinning having a stationary blade with cutting teeth and a movable blade with cutting teeth, the blades being mounted in effective cutting relation with the teeth of the movable blade projecting beyond the ends of the teeth on the stationary blade, whereby hair first engages the teeth of the movable blade and is agitated and fed in controlled manner between the movable teeth into cutting engagement with the teeth of the stationary blade.The relative longitudinal positioning of the two blades is non-critical, it being necessary only to position the blades such that the effective cutting lengths of the teeth on the stationary blade lie within the limits of the effective cutting lengths of the teeth of the movable blade. The effective cutting length of the teeth of the stationary blade is of the order of about one or two times the diameter of human hair, thereby providing control over the amount of hair cut so overcutting and uneveness are avoided.

Abstract: In a hair cutting and grooming apparatus, a blade set having comb teeth which overlap the cutter teeth to a very limited extent in order to minimize the amount of hair engageable with and adapted to be cut by the reciprocating action of the cutting teeth. Guide means provided between the comb and cutter of the blade set accurately limit the overlap of tips of the cutter with the gullets of the comb teeth to a dimension of on the order of 0.005 to 0.020 inches.

Abstract: A trimming unit with stationary and axially movable cutters, and a coupling member which drives the movable cutter, and helical springs disposed at either side of the coupling member for urging the cutters against each other, and for urging the movable cutter to return to its neutral position.

Abstract: An electric hair trimmer for use as a home appliance having cutters covered by a flap which in the closed condition resiliently presses against a movable trimming cutter, and in the open condition allows removal of the cutters for cleaning.

Abstract: This invention teaches a convertible portable electric tool having a common power housing and different operating tool output pieces which can be releasably secured to said power housing without the need of any tools. Each of the tool output pieces has a stationary element and a movable element supported by the stationary element. The power housing has an exposed drive element which can cooperate with and drive the movable element when the statonary element is properly positioned relative to the housing. The stationary element in turn is sized to cooperate with the housing to cover the exposed drive element and be accurately positioned and held in place against the housing. Flexible fingers cantilevered integrally from the housing have free end flexture parallel to the stationary element, and further have projections on the finger ends that interlock with the positioned stationary element to hold it operatively in place relative to the housing.