| 摘要 |
<p>. A frame is vertically movable, the frame being arranged to carry out a full stroke to pick up still standing bowling pins and a partial stroke to place pins on the surface of a bowling alley; to control the length of the stroke, and provide for soft stopping of the frame at the terminal end of its stroke, a stroke control and limit lever is selectively positionable in interfering relation with respect to the downward movement of the frame. The interference position of the control and limit lever is externally controllable, for example by a magnet, the lever being further connected to a hydraulic dashpot. When in interfering position, the frame, upon its downward stroke, impinges on the control and limit lever which can deflect, the dashpot gradually braking the downward movement until the deflection limit of the limit lever is reached, for example at the end position of the dashpot.</p> |
