| 摘要 |
1,078,872. Wrenches. BYRON JACKSON Inc. March 8, 1966 [April 1, 1965], No. 10147/66. Heading B4W. [Also in Division E1] A gripping surface on a die member or on the surface of a tool comprises an elongated surface having a middle portion m comprising transversely adjacent longitudinally extending ridges and end portions e 1 , e 2 comprising generally diamond shaped ridges. The ridges are developed by forming two groups of V-shaped grooves superimposed upon and intersecting each other, adjacent grooves in each group defining an arc on a chord of a circle. In one group the circular arcs a 1- a 7 are developed from equal radii r 1- r 7 having centres c 1 -c 7 equidistantly displaced along the centre line CL. The centres of the second group of arcs are located on the common centre line CL opposite those of the first group, on the other side of the surface or die. In a modification the centres of each group of arcs are located at a common centre, the centres being located on each side of the surface on a common centre line perpendicular to the longitudinal axis. The tops of the ridges may be pointed or flat. The sides of a groove may be disposed at 90 degrees. |
