Book 3 — Pneumatic Door Check Made of Bicycle Pump

This Neat and Effective Door Check was Made of an Old Bicycle Pump and a Strip of Iron, Shaped and Polished

A door was provided with a heavy coiled spring that caused it to slam shut, and in order to overcome this nuisance, a check was made from an old bicycle pump. The fittings being worked out neatly, did not mar the appearance of the woodwork. Band iron, ¹⁄₈ by 1¹⁄₂ in., was used for the fittings. A clamp, as detailed, was made to hold the end of the pump cylinder. A bracket, 5¹⁄₂ in. long, of similar iron was fastened to the door, as shown, with screws, and the clamp bolted to it. The end of the plunger was extended and bent at a right angle, so as to pivot in a small angle bracket attached to the trim, as shown in the front view. An air-release hole was provided, as indicated, so that the air was freed from the cylinder gradually as the door closed, thus preventing slamming.—P. P. Avery, Garfield, New Jersey.