| 摘要 |
264,144. Bethlehem Steel Co., (Assignees of Nieman, H. W.). Jan. 7, 1926, [Convention date]. Crossheads.-A formula for a mechanical movement is evolved from an analysis of the relations between a pair of force transmitting elements 12b, Fig. 3, and a double wedge 12<c> slidable upon a support 12a, the wedge being jammed against its support by a force transmitted by one of the elements 12<b> singly but being free to slide when the lateral components of forces transmitted by both elements balance or substantially balance one another. The mechanical principle involved is developed in numerous modifications. In a locomotive crosshead providing automatic adjustment for wear, shoes 11<b> sliding in guideways 11<e> are loosely engaged by studs 11<a2> on the piston rod 11<a> and carry rollers resting on spring-pressed wooges 11<c>. The wedges can slide to take up slack due to wear, and are responsive to simultaneous pressure of the rollers, but they are unyielding in rsponse to the oblique thrust of the connecting rod 11<a>. |
