发明授权
US5358447A Bowling ramp 失效
保龄球场

Bowling ramp
摘要:
A new and improved bowling ramp useful for acceleration and directional control of a bowling ball by handicapped, disabled, weak and infirm persons of all ages includes a sloping guide track having a lower end adapted to rest on a bowling alley surface and an upper end having a horizontal segment adapted to support a bowling ball at rest. Portable legs are pivotally interconnected at their upper ends to support the upper end of the guide track and a lower end of each leg is adapted to engage the bowling surface in non-slipping engagement to provide lateral stability. The sloping guide track includes a frictional web surface on the downwardly sloping rails of the guide track for causing the bowling ball to spin and provide gyroscopic stability for the bowling ball as it is discharged down the ramp.
公开/授权文献
信息查询
0/0