Pullback motor: Difference between revisions
Andy Dingley (talk | contribs) clarify "coil" vs "spiral" |
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Pulling the car ''backward'' (hence the name) winds up an internal spiral spring; a flat spiral rather than a [[helix|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 (device)|ratchet]] and the car then rolls freely onward.<ref name="Darda, standard motor" |
Pulling the car ''backward'' (hence the name) winds up an internal spiral spring; a flat spiral rather than a [[helix|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 (device)|ratchet]] and the car then rolls freely onward.<ref name="Darda, standard motor">{{Cite web |
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|title=Darda standard Mega-motor |
|title = Darda standard Mega-motor |
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|url=http://www.onlytoys.com/toystore.taf?do=skudetail&sku=D11713 |
|url = http://www.onlytoys.com/toystore.taf?do=skudetail&sku=D11713 |
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|publisher=onlytoys.com |
|publisher = onlytoys.com |
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|deadurl = yes |
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|archiveurl = https://web.archive.org/web/20030423011846/http://www.onlytoys.com/toystore.taf?do=skudetail&sku=D11713 |
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|archivedate = 2003-04-23 |
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Most of these cars are otherwise free-rolling. Winding them up requires them to be pushed downwards, engaging the clutch.<ref name="Darda, standard motor" /> As the motor is only engaged for winding whilst held down, the complete winding must be completed in one pass, unlike the [[flywheel motor]]. A few motors have an internal [[one-way clutch]] that allows winding with a back-and-forth motion.<ref name="Darda, standard motor" /> |
Most of these cars are otherwise free-rolling. Winding them up requires them to be pushed downwards, engaging the clutch.<ref name="Darda, standard motor" /> As the motor is only engaged for winding whilst held down, the complete winding must be completed in one pass, unlike the [[flywheel motor]]. A few motors have an internal [[one-way clutch]] that allows winding with a back-and-forth motion.<ref name="Darda, standard motor" /> |
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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 (toy)|Darda]] use such a mechanism for their ''Stop'n'Go'' motor.<ref |
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 (toy)|Darda]] use such a mechanism for their ''Stop'n'Go'' motor.<ref>{{Cite web |
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|title=Darda Stop'n'Go replacement motor |
|title = Darda Stop'n'Go replacement motor |
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|url=http://www.onlytoys.com/toystore.taf?do=skudetail&sku=D11714 |
|url = http://www.onlytoys.com/toystore.taf?do=skudetail&sku=D11714 |
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|publisher=onlytoys.com |
|publisher = onlytoys.com |
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|deadurl = yes |
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|archiveurl = https://web.archive.org/web/20100829180913/http://www.onlytoys.com/toystore.taf?do=skudetail&sku=D11714 |
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|archivedate = 2010-08-29 |
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|df = |
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}}</ref> This is pre-wound, then releases automatically when shunted from behind. This allows [[relay race]]s to be set up with multiple cars. |
}}</ref> This is pre-wound, then releases automatically when shunted from behind. This allows [[relay race]]s to be set up with multiple cars. |
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Revision as of 00:31, 4 April 2018
A pullback motor (also pull back 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]
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 whilst held down, the complete winding must be completed in one pass, unlike the flywheel motor. A few 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.
References
- ^ May, James (2009). Toy Stories. London: Conway. p. 175. ISBN 9781844861071.
- ^ US 2795294, "Keyless device for winding up clockwork mechanism", issued 11 June 1957
- ^ a b c "Darda standard Mega-motor". onlytoys.com. Archived from the original on 2003-04-23.
{{cite web}}: Unknown parameter|deadurl=ignored (|url-status=suggested) (help) - ^ "Darda Stop'n'Go replacement motor". onlytoys.com. Archived from the original on 2010-08-29.
{{cite web}}: Unknown parameter|deadurl=ignored (|url-status=suggested) (help)
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