Abstract: A device for facilitating the alignment of heavy workpieces at a machine table or the like, comprising a housing capable of being arranged below the workpiece at the machine table. A pendulum support is arranged in the housing so as to have a limited tilting movement to all sides and equally can be moved between a rest position and support position where it supports the workpiece. The pendulum support is arranged so that it can be selectively raised and lowered. Further, there is provided a mechanically adjustable support which is guided so that it can be raised and lowered. The mechanically adjustable support is guided in the housing between a rest position and a support position where it supports the workpiece instead of the pendulum support.

Abstract: Clamp capable of mechanical clamping and optionally useful for providing especially high electrical conductivity having a pair of juxtaposed clamping jaws for gripping an object. One important use of the clamp is to grip an article through which high current is required to flow as, for example, in electric welding. At least one of the jaw blocks is of deep case-hardened cold rolled steel, and when used for high electrical conductivity, is copper coated. The face of this block is provided with concentric teeth which bite into the article. The outer faces of the teeth are perpendicular to the surface of the article being gripped. This inhibits skidding of the clamp and also provides good electrical contact where needed, even in the presence of rust or corrosion. The circular shape of teeth permits rotation or oscillation of the clamp during the clamping operation, which facilitates cleaning of the engaged surfaces and enhances electrical conductivity.

Abstract: A clamp is disclosed comprising a frame having two rigid supports spaced mutually apart along an axis and a screw threadedly mounted to one of the supports for axial movement along the axis. A first pressure contact member is pivotably mounted to an end of the screw between the two frame supports. A yoke is pivotably mounted to the other of the two supports for rotary movement about the axis with two yoke arms straddling the axis. A second pressure contact member is mounted to each of the two yoke arms for rotary movement between the two frame supports aside the frame axis.

Abstract: A power semiconductor assembly in which two metallic heat sinks with inner planar surfaces clamp between these surfaces a housing of a power semiconductor therein at a set clamping pressure. The casing has planar surfaces against which the inner planar surfaces of the heat sinks are clamped. Three threaded rod assemblies are assembled in three sets of recesses on the heat sinks controlling the pressure applied to the semiconductor assembly. Each heat sink has three recesses communicating with outer surfaces thereof aligned axially with corresponding similar recesses of the other heat sink. The rod assemblies each have a pair of threaded rods joined coaxially by a molded element made of, for example, porcelain, or a resin epoxy such as "Araldite", or a mica-glass composition. Nuts are threaded on the two rods and a calibrated elastic washer on one rod hold the entire assembly at the desired clamping pressure.

Abstract: A jaw adapter for use with exceptionally thick stock is provided for a clamp in which two jaws are moved along rails relative to each other to clamp boards between them. Such jaw adapter includes a pair of parallel plates with face plate supporting arms to abut and extend above a jaw of the clamp, and includes rollers rotatably mounted in the plates to extend transversely of the rails and support the jaw adapter thereon.

Abstract: A screw clamp having a clamp body provided with a pair of leg portions defining a slot therebetween, a jaw comprising a screw rod disposed on one of said leg portions and adapted to be advanced into or retreated from the slot, and a swivel jaw oppositely disposed on the other leg portion and adopted to be swiveled wherein either one of said jaws are resiliently mounted on the associated leg portion by means of a spring for providing friction between the thread surfaces of the screw rod and its mating threaded hole to thereby prevent the screw rod from being loosened under the influence of unintentional external force such as vibration.

Abstract: A hold down device is disclosed suitable for an edge planing machine for working sheet metal. The hold down device has a plurality of hold down elements arranged in the direction of movement of the sheet metal and in a laterally overlapping relation. A plurality of piston cylinder units are provided and a single hydraulic cylinder is associated with and connected to each element for pressing it down against the sheet metal to be worked. The lateral surfaces of the elements facing the plate edge are in alignment with each other. The piston rod of the hydraulic drives are connected to the middle of each element for swivel action. The individual elements may either have an essentially rhomboidal or Z-shaped plan view. A further improvement adds spring forces and guidance to the hold down action.

Abstract: An adjustable self-aligning locator for supporting a plurality of parts in their proper relative position for assembly and/or clamping to a machine bed and the like. The locator includes a support member having a base leg with a cam locking device for engagement with a T-slot on the machine bed and an upright leg with a side extension portion having an arcuate groove therein. An angle member having a matching arcuate shaped protuberance at one end in engagement with the arcuate groove in the upright leg extension provides an adjustable angle working face for contact with the workpiece.

Abstract: A clamping fixture for rectangular workpieces is formed by a pair of oppositely directed cylindrical chuck jaws, each mounted so as to be freely rotatable about a longitudinal axis. Each of the chuck jaws has a cut-out sector extending along its length, which forms a seat for the workpiece and which is defined by a pair of extending surfaces set at right angles to each other and intersecting in a common edge extending co-axially with the axis of rotation of the chuck jaws. Each of the chuck jaws is provided with a longitudinal slot extending inwardly from the intersection of the seat surface and terminating short of the opposite wall, so as to provide an integral web connecting the seat surfaces.

Abstract: A substantially table-like member transversely defining a T-shape is pivotally connected by its leg portions to the end portion of one jaw of a clamp. An article engaging surface of the adapter is provided with one or more recesses for engaging irregular surfaces to be gripped by the clamp. The T-shape of the adapter secures one jaw of the clamp to a workpiece engaging tool by inverting the adapter and slidably inserting it into a T-shaped slot.

Abstract: A fixture for holding parts to be joined together featuring clustered arrangements of pressure applying members. An interconnected yet independent mounting of individual pressure applying members enables a distributed pressure to be applied over a contacted area of a work surface, irrespective of whether such area is flat or curved. Single point pressure is applied uniformly to multiple pressure points. In an illustrated embodiment, clusters of pressure applying members are suspended within a generally C-shaped fixture which includes a cam lever manipulative to apply and to release pressure effects.

Abstract: There is provided a clamp which is well suited for use as a lifting clamp for lifting and moving materials of assembly in a shipyard, etc. and as a pulling jig in welding and other operations. The clamp comprises a clamp body including a shackle for engagement with a pulling device and a slot for receiving an article, and a pair of jaws provided on the leg portions of the clamp body on the opposite sides of the slot to grip the article in the slot, one of said jaws consisting of a screw rod and the other jaw consisting of a swivel jaw with a spherical surface, whereby when the article clamped in the slot by the pair of jaws tends to slide in any direction with respect to the clamp body, the article is more positively gripped by the pair of jaws.