A pullback motor (also pull back, pull back and go or pull-back) is a simple clockwork motor used in toy cars. A patent for them was granted to Bertrand 'Fred' Francis in 1952 as a keyless clockwork motor.[1][2]
Pulling the car backward (hence the name) winds up an internal spiral spring; a flat spiral rather than a helical coil spring. When released, the car is propelled forward by the spring. When the spring has unwound and the car is moving, the motor is disengaged by a clutch or ratchet and the car then rolls freely onward.[3] Often the clutch mechanism is geared so that the pullback distance needed to wind the spring is less than the distance the spring is engaged propelling forward.
Most of these cars are otherwise free-rolling. Winding them up requires them to be pushed downwards, engaging the clutch.[3] As the motor is only engaged for winding while held down, the complete winding must be completed in one pass, unlike the flywheel motor. Some motors have an internal one-way clutch that allows winding with a back-and-forth motion.[3]
Some pullback motors, usually intended for racing in pairs, have used a catch and release mechanism to retain their springs. These may be wound separately, then launched together by releasing their spring triggers. Darda use such a mechanism for their Stop'n'Go motor.[4] This is pre-wound, then releases automatically when shunted from behind. This allows relay races to be set up with multiple cars.
A few pullback motors are used in toys other than cars. The K'Nex construction toy has such a motor, as have some later Meccano sets.
The very simplest of these motors may use a stretched rubber band as a linear spring, rather than a coil spring. These are bulky and less powerful but require little manufacturing sophistication: coil springs, although apparently simple, demand a highly developed steel metallurgy. For this reason, these toys are usually home- or crafts made.
^May, James (2009). Toy Stories. London: Conway. p. 175. ISBN 9781844861071.
^US 2795294, Francis, Bertram F., "Keyless device for winding up clockwork mechanism", published 1957-06-11
^ abc"Darda standard Mega-motor". onlytoys.com. Archived from the original on 2003-04-23.
^"Darda Stop'n'Go replacement motor". onlytoys.com. Archived from the original on 2010-08-29.
A pullbackmotor (also pull back, pull back and go or pull-back) is a simple clockwork motor used in toy cars. A patent for them was granted to Bertrand...
perpetual motor that revolves the kinetic energy. As the flywheel, unlike the spring of a pullbackmotor, is continuously rotating and not held, the motor may...
mechanical motor, or to create automata. These may be either key-wound, as were many 20th-century model trains, or a simpler pullbackmotor. Most photographic...
Fury design by adding larger, more highway friendly front rubber, more pullback on the handle bars and classic, cruiser styled fenders; and the Interstate...
version has rider floorboards, different shaped silencers (mufflers) and 'pullback' handlebars. More colour choices were added and the pillion seat was modified...
unofficial term commonly used to differentiate it from the "Special," which has pullback bars, a teardrop tank, and other differences in appearance). The Es and...
Fury design by adding larger, more highway friendly front rubber, more pullback on the handle bars and classic, cruiser style fenders. The Interstate took...
possibly coming to an end. For the decade, the Dow saw a rather substantial pullback for a negative return from 11,497.12 to 10,428.05, a loss of a 9.3%. During...
offering the XS Eleven "Special" (SF Model). The XS Eleven Special sported pullback buckhorn handlebars, a stepped seat, a 16-inch rear wheel, a smaller capacity...
crisis. Turkish banking authorities warned state-run banks against the pullback of loans from the larger financial sectors. Turkey's economy resumed its...
inaugural member of the Combat Robot Hall of Fame. It also has its own pullback toy, pullback minibot and DVD. Team Chaos had a small rivalry with Team Mace....
Israel and Syria to reach an agreement on separation of their troops and a pullback within the Golan Heights. Lightning struck and killed four teenage girls...
Santillana. "SoftBank Puts Blockchain Investments On Ice As Part Of Startup Pullback". Forbes. Retrieved 25 February 2023. "Accounting for Intercorporate Investments:...
say NBC News, March 16, 2024 Joann files for bankruptcy amid consumer pullback, but plans to keep stores open CBS News, March 18, 2024 Fritze, John; Devan...
Rocket III Classic 2294 2006-2007 Rider floorboards, different mufflers, 'pullback' handlebars, more comfortable passenger seat Rocket III Tourer 2294 2007-2007...
Schwirtz, Michael; Engelbrecht, Cora; Specia, Megan (7 May 2022). "Russian Pullback Seen Near Kharkiv, Despite Victory Day Push for Gains". The New York Times...
critical minerals hold on Africa". Reuters. Mining Journal "The [Ivanhoe] pullback investors have been waiting for", Aspermont Ltd., London, UK, February...