Abstract: A compression forceps with four bar linkage is formed of a stationary handle and jaw connected by a shank area; a moveable jaw; a moveable handle having the approximate shape of a bell crank with major and minor arms; and a connecting link member having first and second opposite ends. The four links are joined at pivots, with a first pivot connecting the major and minor arms of the moveable handle to the rear end of the shank area of the stationary handle and jaw. A second pivot connects the free end of the minor arm to a rear end of the moveable jaw. A third pivot connects a first end of the link to the front end of the shank area of the stationary handle and jaw. A fourth pivot connects the second end of the link to a middle area of the moveable jaw. The compound linkage thus formed operates the jaws with an increase of the relative inside angle between the jaws as the jaws close.

Abstract: A motor drives a hydraulic pump having a sealed fluid system with positively pressurized fluid reservoir. A tool head connected to the hydraulic pump has first and second shearing jaws, each with a respective a cutting edge and a workpiece seat. The first jaw is pivotally mounted to swing its cutting edge past the second cutting edge. A cushioning device carried by the second jaw is in the path of the first workpiece seat and retains the sheared portion of the workpiece.

Abstract: A punch tool provides two generally longitudinal handles joined by a transverse pivot pin that is carried in a resilient bushing. One of the handles defines a straight bore that houses a sliding punch die and further defines a support for a mating, stationary die. The second handle is joined to the sliding die such that relative movement between the handles causes the sliding die to move within the bore, toward or away from the stationary die. Flexibility of the bushing permits the pivot pin to shift its axis longitudinally of the tool while permitting straight movement of the sliding die.

Abstract: Cutting dies are mounted for parallel movement in a scissors-action handle assembly employing pivot pins mounted both forward and rearward of the pivot axis of the handles, and one of the engagement openings for a pivot pin in each die is longitudinally extended for necessary clearance. The cutting edges of the two dies are at one longitudinal end of the tool extending beyond the portion of the dies between the two pivot pins. Parallel action is guided by a pair of guide pins longitudinally spaced and to the maximum extend possible located in the plane of the die cutting edges. A compression spring is centrally located between the guide pins to bias the dies to open position. When the dies are of the kind adapted to trim venetian blind slat ends, one die aligns the blind slat by transverse ribs to the cutting edge.