The engineer's sketch-book of mechanical movements, devices, appliances, contrivances and details employed in the design and construction of machinery for every purpose - Thomas Walter Barber

[2505]. Revolving worm for operating a belt shifting bar, locking it at the same time.

[2506]. Worm gear may be thrown out or in by moving the wheel sideways on its shaft.

[2507]. Bolt and slot device for gearing two wheels together on one shaft, used on lathe headstocks.

[2508]. Half nut for throwing out of gear, with screw, and fitted with spring to take up the wear of the nut.

[2509]. Sliding shaft for winch or other gear, to shift the pinion out of gear or change to another speed (as in [No. 2293]).

[2510]. Another method of locking a sliding shaft in or out of gear.

(See also [p. 194].)

[2511]. Variable belt drive by elliptic pulley.