| 摘要 |
A C-shaped frame having an upper horizontal portion, a vertical side portion, a lower horizontal portion and an open side with an elongated, threaded presetting screw vertically slidable in a vertical screw slide sleeve on the forward extremity of the upper horizontal portion in axial alignment with a valve spring seat mounted on the forward extremity of the lower horizontal portion. A tiltable lever medially mounted on and above the upper horizontal portion and pivotally connected at its forward extremity to an actuating nut threaded on the presetting screw above the screw slide sleeve. A handle member pivoted on the vertical side portion in the plane of the frame and a toggle link connecting the rear extremity of said tiltable lever to the handle member so that vertical movement of the handle member will impart vertical movement to the presetting screw to compress the valve spring between the valve seat and the presetting screw without rotation of the latter.
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