Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 421
y impossible to throw thespring out of service. For the light andcheaper work, a single spiral spring (Fig.21), costing from 15 to 25 cents, can be used independently of the butt; it is easily unhooked when not needed. For the better grades of work and heavier doors, a spring check should be used… … Fig. 21. Common Type of Spiral Spring for Doors. Double=Acting Butts. The function of the double-acting buttis to allow the door to swing to both sides of the jamb. It is neces-sarily of the spring-butt type, above mentioned, but is double and is soset as to leave the door shut when at rest. There…
Architecture · Building · Carpentry
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