Abstract: There is herein described a tool for accurately aligning a plurality of plates on a plaque board, the tool including a plurality of plate-holding finger members adjustably positionable along an elongated arm member which is itself adjustably positionable along a pivotal portion of an elongated guide member, the arm member along with its finger members being pivotally movable upwardly to facilitate the placement and replacement of plate boards on a base plate of the tool without the danger of scratching the boards.

Abstract: There is herein described a blanking press in which a punch is moved upwardly under pressure to engage a sheet workpiece and pass through a punch-conforming die plate aperture, the press housing including a product retrieving and operator-viewing opening in the upper end thereof to allow an operator to directly view the alignment of the workpiece relative to the die opening and the operation of the press by looking in a downward direction.

Abstract: A heat dissipating skateboard wheel assembly on which an elongate cylindrical tire formed from an elastomeric material is so supported that when the tire is subjected to axially directed forces of substantial magnitude, the end portions of the tire will not tend to cold flow, but will instead temporarily deform into circular confined spaces defined on the assembly. The external surface of the tire preferably has circumferentially and axially spaced grooves extending thereinto, with the grooves cooperating to define a number of independently deformable islands therebetween. The islands, as they sequentially roll into pressure contact with a flat supporting surface deform three-dimensionally due to the combined weight of the skateboard and user to which they are subjected. The islands, as they so deform, are forced into maximum surface frictional contact with the supporting surface, and the skateboard is accordingly less inclined to slip laterally when the user of the skateboard is negotiating a sharp curve.