Patent TW-201736169-A (TW)
Title: Automatic detent of trolley wheel capable of automatically fixing the wheel when the trolley is at stationary and automatically releasing the wheel to allow the wheel to freely rotate when the trolley is pushed or pulled
Inventor: CHEN CHING-CHUNG
IPC: B62B5/06
Filed: 2016-04-01
Abstract: An automatic detent of trolley wheel comprises a handlebar set capable of slightly rotate along the axis; a detent rod device pushed by a spring; and a detent disc and various fixing seats capable of being fixed to the vehicle axle. The handlebar set comprises a handlebar fixing seat connected to the vehicle body, a handlebar rotatable along the axis fixed on the handlebar fixing seat, and a set of utmost stoppers limiting the rotating range of the handlebar and fixed on the vehicle body. The detent rod device comprises a detent rod having a rotating axis and an abutting pillar, a spring, a steel cable, a set of cable guiding rollers, and a detent rod fixing seat. The detent rod is connected to the detent rod fixing seat through the rotating axis. The detent rod fixing seat is fixed one the vehicle body and disposed with a spring fixing seat capable of fixing the spring and disposed with a slot hole passed by the steel cable. The spring is disposed between the spring fixing seat and the abutting pillar end of the detent rod to push the abutting pillar of the detent rod toward the detent disc. The rear of the abutting pillar end of the detent rod is connected with the steel cable which passes through the spring and the spring fixing seat to connect with the handlebar. The steel cable guiding wheels are placed at two sides of the steel cable to limit the steel cable at the centerline position and convert the displacement for the handlebar taking force into the pulling force of pulling the detent rod. The detent disc is a circle disc disposed on the wheel axle, in which a diameter is smaller than the wheel diameter. The circumference is disposed with several concave slots. The width of the concave slot is greater than the width of the abutting pillar of the detent rod so that the abutting pillar of the detent rod can be inserted into the concave slot. Its effect is that when the trolley is at stationary, the abutting pillar of the detent rod is inserted into the concave slot of the detent disc to restrict the rotation of the wheel. When using the handlebar to push or pull the vehicle, the handlebar is allowed to perform rotation motion along the axis, and the rotation magnitude is limited by the utmost stoppers. Most of the pushing force or the pulling force will be transmitted to the vehicle body through the handlebar axis and the utmost stoppers and are taken as the power. Moreover, a small portion of the force will pull the steel cable along the rotation direction during the rotation of the handlebar, and the applied force to the steel cable is converted into pulling force through the steel cable guiding wheels to pull up the detent rod and compress the spring, enabling the abutting pillar of the detent rod to leave the concave slot of the detent disc so that the wheel can freely rotate. When the applied force to the handlebar is vanished, the compressed spring will push the abutting pillar of the detent rod toward the concave slot of the detent disc to limit the rotation of the wheel so as to achieve the objective of automatically stopping the trolley.