Abstract: A device for embossing the edge of round blanks, in particular coins, has a forming wheel which is provided with roll-forming segments. The forming wheel has associated abutment elements which may likewise be mounted on forming wheels. A positioning device guides the round blanks, in coordination with the equally directed synchronous rotation of the forming wheels between the forming wheels and, after edge embossing has taken place out of the wheel interspaces.

Abstract: An improved stability canvas tensioning picture frame which is formed by a plurality of abutting frame members is provided with a tapered screw and facing tapered channels in the abutting frame members, with each of the abutting frame members having a semi-circular slot adapted to receive an apertured disk in a mild interference fit, with the single apertured disk providing longitudinal and lateral stability between the abutting frame members when the screw is screwed down into the tapered channel to move the abutting members away from each other.

Abstract: A canvas tensioning picture frame formed by a plurality of adjacent frame members having complementary first and second half-cavities formed in the ends thereof, a complementary half-bore extending between the first and second cavities, a first disk having a central aperture, a second disk having a central aperture, and a frusto-conical screw having a head sized to be received by the central aperture of the first disk. The first disk is disposed within a first cavity formed of the two first half-cavities of adjacent frame members and is manually rotatable therein. The second disk is disposed within a second cavity formed of the two second half-cavities of adjacent frame members and is firmly engaged therein to limit relative movement of adjacent frame members. The frusto-conical screw is turned by rotating the first disk and thus driving the frusto-conical screw downwardly into a bore formed by the two complimentary half-bores of adjacent frame members.

Abstract: A tensioning stretched-canvas frame and method of use is disclosed characterized by the end portion of adjacent frame members having complementary cavities formed therein which receive a spring insert adapted to persistently force the frame members apart against the retention of canvas stretched taut thereover. The spring insert resists both rotation within the cavities and bending in the plane of the frame, accordingly making the assembled frame resistent to twisting between the frame members, distortion of the frame area, and warping of the frame's plane. A disposable bridging member may be temporarily used to maintain the frame members in abutting contact against the spring forces during initial stretching of the canvas.