. The Street railway journal . Cabe anti-friction ball-bearing hangers which consist of two spherical rollersrunning in a cylindrical tube or track. They cannot jamor get out of the track. The pneumatic door operating device is one patented byJ. E. Osmer, master mechanic of the Northwestern Ele-vated, and was described in the Street Railway JournalOct. 13, 1906, and Feb. 9, 1907. It consists of two cylindersin line, one of smaller diameter than the other, and havinga common piston. This piston carries a rack, engagingwith a geared sector to which is attached the operatingarm through a slot in
. The Street railway journal . Cabe anti-friction ball-bearing hangers which consist of two spherical rollersrunning in a cylindrical tube or track. They cannot jamor get out of the track. The pneumatic door operating device is one patented byJ. E. Osmer, master mechanic of the Northwestern Ele-vated, and was described in the Street Railway JournalOct. 13, 1906, and Feb. 9, 1907. It consists of two cylindersin line, one of smaller diameter than the other, and havinga common piston. This piston carries a rack, engagingwith a geared sector to which is attached the operatingarm through a slot in the bottom of the cylinder valve is located at the end of the larger cylinder. Toclose the door, air from the control line of the brake systemat 70 lb. pressure is admitted to the end of the small orhigh-pressure cylinder through a supply pipe from thevalve. The large cylinder has a free exhaust to the at-mosphere through a pin valve which is wide open at thebeginning of the stroke. An eccentric on the sector, how-. DETAILS OF DOOR-OPENING MECHANISM ever, is connected to this pin valve and so adjusted thatduring the last 6 in. of the movement of the door the pinvalve closes and throttles the exhaust of the large cylinder,thereby cushioning the door as it comes against the open the door, the air supply is cut off and the largeand small cylinders are connected by a port in the allows the volume of high-pressure air in the smallcylinder to expand and equalize in the large an equalized pressure on both sides the piston tendsto move into the small cylinder because of the difference inarea on which the same equalized pressure is applied. Asthe piston moves toward the end of the small cylinder itblanks the large by-pass port through which the air flowsin equalizing, leaving only a small port through which theremainder of the air can pass over to the other side. Thisgives the same cushion effect at the end of the stroke as thepin valve used
Size: 1862px × 1341px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
