Abstract: Exerciser for strengthening the grip of the hand having a pair of handles which are removably mounted on the arms of a helical torsion spring in a manner permitting springs having different strengths or resistances to be used interchangeably with the handles. The handles can be constrained against rotation on the spring arms, allowed to rotate freely, or allowed to rotate to a limited degree, depending upon the needs of the user.

Abstract: Jump rope assembly comprising a rope, a handle at one end of the rope, an axially extending axle mounted in bearings within the handle for rotation about its axis, a gimbal head affixed to the axle at one end of the handle including a ring with a circular opening having an axis perpendicular to the axis of the axle, and a spherical ball of greater diameter than the opening pivotally seated against one side of the ring, with an end portion of the rope passing freely through the opening and being attached to the ball in a manner permitting the ball to pivot freely with respect to the axis of the opening as the gimbal head rotates about the axis of the axle.

Abstract: Jump rope assembly comprising a rope, a handle at one end of the rope, an axially extending axle mounted in bearings within the handle for rotation about its axis, a gimbal head affixed to the axle at one end of the handle including a ring with a circular opening having an axis perpendicular to the axis of the axle, and a spherical ball of greater diameter than the opening pivotally seated against one side of the ring, with an end portion of the rope passing freely through the opening and being attached to the ball in a manner permitting the ball to pivot freely with respect to the axis of the opening as the gimbal head rotates about the axis of the axle.

Abstract: Exerciser for strengthening the grip of the hand having a pair of handles which are removably mounted on the arms of a helical torsion spring in a manner permitting springs having different strengths or resistances to be used interchangeably with the handles. The handles can be constrained against rotation on the spring arms, allowed to rotate freely, or allowed to rotate to a limited degree, depending upon the needs of the user.

Abstract: An utility knife and method of blade removal in a utility knife comprising releasing a cam pressure using a lever on a fastener holding a first half and a second half of a handle of a utility knife; separating the first half and second half; and rotating the first half from the alignment with the second half to allow a blade to be removed are shown.