Chicago Fire Department historian Ken Little

Ken Little, a beloved historian of the Chicago Fire Department and a retired senior fire alarm operator, passed away this week at the age of 84. Known for his deep knowledge of Chicago's firefighting history, Ken co-authored four volumes on the history of Chicago firehouses with Father John McNalis. He also led bus tours that brought the city’s rich fire department legacy to life for many visitors. Ken was a devoted husband, father, grandfather, brother, and uncle. He is survived by his children: Kenneth, Robert (Kimberlee), Stephen (Rhonda), Philip (Lee), Richard, Raymond, Mary Ellen (Steve) Cooper, Anna (Ron) Stargardt, and Rita (Rich) Carlson, as well as his late son Thomas. He leaves behind grandchildren Timothy, Christine, Kevin, and Jenna, and many nieces and nephews. A loving and caring man, Ken touched the lives of everyone he met. A visitation will be held on Monday, December 11, from 3 p.m. to 9 p.m. at Cumberland Chapels, located at 8300 W. Lawrence Ave., Norridge. Friends and family are invited to gather at St. Michael Church, 1633 N. Cleveland Ave., Chicago, at 10:15 a.m. on Tuesday for a Mass of Christian Burial at 10:30 a.m. The interment will be private at All Saints Cemetery on Wednesday. Ken was not only a historian but also a dedicated teacher at Wright Junior College, where he shared his passion for Chicago history with students. In lieu of flowers, donations can be made to the Fire Museum of Greater Chicago, located at 517 Senon Dr., Lemont, Illinois 60439–4093. For more information, call (708) 456-8300 or visit www.cumberlandchapels.com. According to a report from chicagolocal.cbs.com, Father John McNalis, the Fire Department Chaplain, often spoke of Ken's remarkable memory and storytelling ability. "He never forgot anything," McNalis said. "He knew all the details, could rattle off names, times, and companies that responded. He had an incredible way of bringing history to life." McNalis also recalled that their collaboration on the four-volume firehouse history took 16 years, and during those years, Ken was always full of energy and stories. "Phone calls with him would often start with, 'Do you have a minute?' And if you said yes, you’d end up talking for 30 to 45 minutes. You'd look at the clock and wonder what you were even talking about in the first place." From chicagofd.org, there's a video showing Ken at work in the old Main Fire Alarm Office — watch the first 16 seconds to see a glimpse of his long career. The video is a touching tribute to a man who spent his life preserving the history of the Chicago Fire Department.

Air Cylinder Barrel

FESTO standard Aluminum Pneumatic Cylinder Tube for Pneumatic Cylinder

FESTO cylinder is composed of Cylinder Barrel, end cover, piston, piston rod, and sealing components.

The inner diameter of the FESTO cylinder barrel represents the magnitude of the cylinder output force. The piston should slide smoothly back and forth inside the cylinder, and the surface roughness of the cylinder should reach Ra0.8um. For steel pipe cylinders, the inner surface should also be plated with hard chromium to reduce frictional resistance and wear, and to prevent rusting. In addition to using high carbon steel pipes, the cylinder barrel material is also made of high-strength aluminum alloy and brass. Small cylinders use stainless steel pipes. Cylinders with magnetic switches or cylinders used in corrosion-resistant environments should use materials such as stainless steel, aluminum alloy, or brass for the cylinder barrel. FESTO cylinder piston adopts a combination sealing ring to achieve bidirectional sealing, and the piston and piston rod are connected by rivets without nuts.

FESTO cylinder end caps are equipped with intake and exhaust ports, and some also have buffer mechanisms inside the end caps. The end cover on the rod side is equipped with a sealing ring and a dust ring to prevent air leakage from the piston rod and prevent external dust from entering the cylinder. A guide sleeve is installed on the end cover of the rod to improve the guiding accuracy of the cylinder, withstand a small amount of lateral load on the piston rod, reduce the downward bending of the piston rod when it extends, and extend the service life of the cylinder. The guide sleeve usually uses sintered oil containing alloy and forward leaning copper castings. In the past, malleable cast iron was commonly used for end caps. To reduce weight and prevent rust, aluminum alloy die-casting was often used, and brass material was used for micro cylinders.

FESTO cylinder piston is a pressurized component in the cylinder. To prevent air leakage between the left and right chambers of the piston, a piston sealing ring is installed. The wear-resistant ring on the piston can improve the guidance of the cylinder, reduce the wear of the piston sealing ring, and reduce frictional resistance. Wear resistant rings are made of materials such as polyurethane, polytetrafluoroethylene, and synthetic resin for fabric clamping. The width of the piston is determined by the size of the sealing ring and the necessary length of the sliding part. The sliding part is too short, which can easily cause early wear and jamming. The materials commonly used for pistons are aluminum alloy and cast iron, while pistons for small cylinders are made of brass. The FESTO cylinder piston rod is the most important load-bearing component in the cylinder. High carbon steel is usually used, with a surface treated with hard chrome plating, or stainless steel is used to prevent corrosion and improve the wear resistance of the sealing ring. FESTO cylinder seals: The sealing of components in rotary or reciprocating motion is called dynamic sealing, while the sealing of stationary parts is called static sealing.

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