Builder's hardware; a manual for architects, builders and house furnishers . r-spring. at an allo]e rather than strictly vertical, and in- agoner & ° ^ clined towards the latch of the door so that whenthe door opens the spring acts both by resistance to compres-sion lengthwise and by the uncoiling effect of the wire. The Star DooVan WagWilliams Co Door-Spring Star Spring. BUILDERS HARDWARE. Chapter VI. Engine-houseSpring spring can be tightened in the same manner as the spring buttspreviously described, by turning the upper spindle to whichthe spring is attached, the pin A holding the spindle
Builder's hardware; a manual for architects, builders and house furnishers . r-spring. at an allo]e rather than strictly vertical, and in- agoner & ° ^ clined towards the latch of the door so that whenthe door opens the spring acts both by resistance to compres-sion lengthwise and by the uncoiling effect of the wire. The Star DooVan WagWilliams Co Door-Spring Star Spring. BUILDERS HARDWARE. Chapter VI. Engine-houseSpring spring can be tightened in the same manner as the spring buttspreviously described, by turning the upper spindle to whichthe spring is attached, the pin A holding the spindle in posi-tion. Figure 117 illustrates another form of door-spring notunlike the foregoing in principle, though in this the spring actsentirely by its resistance to a twisting strain. In the cut,the lower screw-plate and hubs are shown drawn slightly awayfrom the spring spindle, so as to exjsose the ratchets whichhold the spring at any desired tension. Figure 118 is a very strong form of direct-acting spring, in-tended to be used on fire-engine-house doors. As shown bv. Fig. I I 7. Reliance Door-spring. Chicago Spring-Butt Co.
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