Screws, a rack-and-pincer device and a release mechanism
Notes on quadruple-thread screws, a crank-driven toothed rod with pincers, and a triggering device
The sheet gathers a range of machine elements: a long threaded screw or worm running across the top with hoppers, gear wheels, a toothed rack, pincers, a crank, an arched caliper-like tool and a coiled spring. A note above the main drawing specifies that each of the screws is to be quadruple-threaded. On the left a crank turns a toothed rod carrying pincers, marked to be set lower, while on the right a device is captioned as a means of releasing or triggering. Several additional mechanisms on the sheet are not covered by the transcription.
On this page
Quadruple-thread screws
A note over the principal drawing prescribes that each of these screws must be made in four threads, that is with a quadruple (four-start) thread, presumably to spread the load or speed the travel.
Crank, toothed rod and pincers
On the left a device combines a crank, a toothed rod (rack) and pincers. A caption numbered "2" notes that this element must be set lower.
Release / triggering device
On the right a mechanism is captioned as a way of releasing or triggering, showing how a held part is let go on demand.