Abstract: A method of mining utilizing a reciprocating drive, in which a tooth is driven along a relatively straight path over an ore surface in one direction of movement so as to cut a groove therein, and then a wheel is substituted in place of the tooth and is rolled within the groove in the opposite direction, the wheel having a radially wedge-shaped circumferential edge portion which applies laterally outward and downward crumbling forces to the groove walls.Both the tooth and the wheel may be incorporated into a unitary wheel assembly as a single tool, by attaching the tooth to a point on the circumference of the wheel. The tool is then locked against rotation during its powered drive stroke in one direction, when the tooth engages the groove, but during its stroke in the other direction is released to permit rotation of the wheel.The method provides for working a number of parallel grooves concurrently, with wheels being utilized only in alternate ones of the grooves.

Abstract: An adjustable reclining chair includes a seat and back supporting frame having a pair of rocker or rocker-shaped members. The rocking action of the rocker members is, however, restrained by a restraint mechanism. A drive mechanism is utilized to move the restraint mechanism, in either a forward or a rearward direction, to adjust the angle at which the chair reclines.

Abstract: A key cutting machine for making coded cuts in a key blank having interchangeable depth control attachments as well as interchangeable punch and die attachments, so that any type of standard key may be cut simply by utilizing the appropriate set of attachments.