Hydraulic elevators; their design, construction, operation, care and management

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 Excerpt: ...thereafter through the wearing away or displacement of a part. If the car stops a short distance beyond the top and bottom floors, it is a sign that the stop valve has become worn along the edges that shut off the flow of water, and to restore the adjustment so that the car will stop even with the floors all that is necessary is to shorten the rod A" by means of the right-and-left coupling. If the car stops short of the top floor and runs below the bottom landing, it indicates that the lifting ropes have stretched, and, while the proper way to restore the adjustment is by shortening the ropes, a slight overrunning can be remedied by shifting the stops on the operating rod to the right, so that the crosshead will have to move farther from the cylinder to close the stop valve when the car is going upward, and less near to the cylinder when the car is descending. This last expedient cannot be resorted to in case much adjustment is required, however, because it will cause the piston to move out of the cylinder too far and strike the buffers, which would cause the elevator to stop even if the stop valve were not entirely closed. In fact, this adjustment cannot be made unless when the car stops at the top floor the piston buffer is not in contact with the stationary buffer; then the stops may be moved a distance less than the clearance between the buffers. It is possible for the adjustment to become changed so that the car will overrun the mark at the bottom floor only. This may be the case if the wear of the stop valve and the stretch of the ropes just offset each other. Such an occurrence is likely to be remote, because the stretch of the ropes is almost sure to be greater or less. In any case, if the car does not stop about the same distance below both la...