Number wheel counters

A counter comprising

• (A) a plurality of successive coaxial number wheels;
• (B) a different ring of gear teeth on each number wheel;
• (C) a different transfer means on each number wheel;
• (D) transfer pinions respectively disposed intermediate successive number wheels;
• (i) each pinion meshing with a ring of gear teeth on one of the number wheels adjacent thereto and adapted to engage transfer means on the preceding number wheel during rotation of said preceding number wheel thereby partially to rotate said one of the number wheels;
• and
• (E) drive means intermittently actuable to rotate a first one of the number wheels thereby to effect counting of the counter;
• (i) characterised in that there is provided
• (F) a shock resistance member freely movable relative to an element of the drive means and so positioned as to oscillate freely in the path of said element in the event of a shock tending to cause movement of the element, the shock resistance member thereby serving to interfere with shock induced movement of the element to inhibit shock induced operation of the counter, but offering negligible resistance to movement of the drive means in normal counting, wherein the drive means includes reciprocally movable pawl means, characterised in that the shock resistance member is positioned as to oscillate freely in the path of said pawl means.