. Electric railway review . nts. Thepiston rod end is so shaped as to engage with a trip hammer,(8) and moves this over the center position past the pivotpoint (9). When the pressure in the cap chamber abovethe diaphragm increases-, the piston is forced downward, com-pressing the spring. The hammer being forced by the piston rod past thedead center, and aided by a spring (13) in housing (11) de-livers a sharp blow to the yoke, carrying the contact blades(16) through which the current is opened and closed, whichare made of bronze metal and well insulated against shortcircuit or ground. The copp
. Electric railway review . nts. Thepiston rod end is so shaped as to engage with a trip hammer,(8) and moves this over the center position past the pivotpoint (9). When the pressure in the cap chamber abovethe diaphragm increases-, the piston is forced downward, com-pressing the spring. The hammer being forced by the piston rod past thedead center, and aided by a spring (13) in housing (11) de-livers a sharp blow to the yoke, carrying the contact blades(16) through which the current is opened and closed, whichare made of bronze metal and well insulated against shortcircuit or ground. The copper tips (14) are quickly separatedand the arc completely extinguished by the powerful magneticfield. These contact tips are of liberal area, presenting largeradiating surface. A separating shield prevents the arcjumping across when the circuit is broken. As the air pressure is reduced, the compressed springat once commences to return to its former position; the pis-ton ro<l again comes in contact with the trip hammer and. Allis-Chalmers Type OB Pneumatic Governor With InsulatingBlock Removed. Insulating Block. One of the chief merits of this device is the simplicityof design. There are no small ports, slides or check valves,such as have ever been a source of trouble in the ordinaryautomatic governor. It is also very positive in its example, the switch arm. engaged by the pressure pistonis held in contact by our special spring device until the in-stant of the quick snap break, and this, together with apowerful magnetic blow-out made in accordance with thelatest designs, prevents sparking or burning of contacts andconsequent pitting. The type OB governor is light, compact and substan-tial; suited to severe continuous service. Its merits maybe better understood from a careful reading of the followingdetailed description. Construction and Operation. A sectional view of the type OB governor is shown here-with. The main body (1) contains a compression spring (4)and p
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectstreetr, bookyear1906
