Chapter XXXIII: Section 40: GEARING, VARIOUS DEVICES IN (not otherwise classed)

=711. Conical rotatory gear.= Applied to reaping machines. See also Pan Screen, No. 1264.

=712. Triangular eccentric,= used to obtain a pause of one-third revolution at each end of the stroke.

=713. Face plate worm gear.=

=714. Double rack and pinion gear.=

=715. Double gear wheels.=

=716. Eccentric gearing;= the wheel ~A~ being fixed on a crank pin in the driving wheel ~B~, drives the dotted gear at a speed proportionate to the diameters of the wheels ~A~ and the driven wheel.

=717 & 718. Forms of epicyclic or planet gear.= Several modes of driving these may be employed by fixing one or other of the three wheels, the other two revolving. See Differential Gear, Section 31.

=719. Multiple trammel gear.= The pinion is half the diameter of the wheel, and makes two revolutions to one of the wheel.

=720. Trammel crank gear;= the crank revolves once to two double strokes of the rod.

=721. Knight’s noiseless gearing,= for two shafts running in opposite directions. Each shaft has two equal cranks at right angles, which are coupled by links to rocking arms, which are also coupled in pairs.

=722. Eccentric variable speed toothed gear.=

=723. Scroll bevil gear.=

=724. Segment reversing gear,= to obtain two speeds in portions of one revolution, and in opposite directions. See Reversing Gear, Section 74.

=725. Snail wheel,= or scroll ratchet.

=726. Combined spur and bevil wheel.=

=727. Double screw gear,= for steering gear, &c.

=728. Angular ball-jointed crank motion.=

=729. Crank gearing= between two shafts running in the same direction. See No. 187. The cranks should be similar to Nos. 174 or 175.

=730. Snail worm gear.=

=731. Diagonal engine or pump,= with bevil gear revolving motion and three or more cylinders.

=732. Angle coupling= on Dr. Hooke’s principle. See No. 292.

=733. Worm and crown gear.= Used in chaff machines; useful to obtain a slow feed on two shafts in opposite directions.

=734. Ball wheel,= with limited angular traverse gearing into one or two pinions.

=735. Scroll and rack.=

=736. Variable speed gear,= from an elliptical or other irregular-shaped driving wheel, combined with a tied idle intermediate wheel.

=737. Spring friction grip wheels.=

=738. Intermittent reversible feed motion.= The pinion is of leather, and drives the segment till it runs out of gear; when the machine is reversed it travels an equal distance the opposite way.