US 12,291,293 B2
Caravan mover system
Ben Hawkins, Ipswich (GB); Jonathan Harrison, Ipswich (GB); and Yuxian Tao, Aberdeen (GB)
Assigned to Purple Line Limited, (GB)
Appl. No. 17/431,420
Filed by PURPLE LINE LIMITED, Ipswich (GB)
PCT Filed Feb. 19, 2020, PCT No. PCT/GB2020/050399
§ 371(c)(1), (2) Date Aug. 16, 2021,
PCT Pub. No. WO2020/169972, PCT Pub. Date Aug. 27, 2020.
Claims priority of application No. 1902281 (GB), filed on Feb. 19, 2019.
Prior Publication US 2022/0081047 A1, Mar. 17, 2022
Int. Cl. B60D 1/00 (2006.01); B60K 1/02 (2006.01); B60K 7/00 (2006.01); B62D 11/04 (2006.01); B62D 59/04 (2006.01); G05D 1/00 (2006.01)
CPC B62D 59/04 (2013.01) [B60K 1/02 (2013.01); B60K 7/0007 (2013.01); B62D 11/04 (2013.01); G05D 1/0016 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A control system for controlling a plurality of caravan movers mounted on a caravan wherein each caravan mover comprises:
drive means comprising a brushed motor; and
a lateral roller wherein the lateral roller is arranged to move in an engagement direction between a first position and a second position and, in which, in the second position the lateral roller is arranged to be urged against a ground contacting surface of a wheel of the caravan in order to transmit the drive from the drive means to the wheel,
wherein a control unit is arranged to independently vary the speed of each brushed motor to enable a gradual change of speed of each brushed motor and wherein the control unit comprises speed compensation system whereby the power supplied to each brushed motor changes in proportion to the load detected on the associated brushed motor, so as to maintain a desired motor speed under variable load.