Builder's hardware; a manual for architects, builders and house furnishers . a complete bolt, and also shows oneform of internal arrangement. When the bolt is thrown, theshoulder on the follow, B, is turned so as to bring it verynearly on a line with the centre of rotation of the spindle, thuslocking the bolt. The spring, C, tends to keep the shoulderfrom rising. The simplest and most ingenious mortise door-bolt whichhas come to our attention is the one manufactured by Sargent& Greenleaf, designatedas the Gem mortise-bolt, Figure 57. It con-sists simply of a solidbolt completely fillingthe dia
Builder's hardware; a manual for architects, builders and house furnishers . a complete bolt, and also shows oneform of internal arrangement. When the bolt is thrown, theshoulder on the follow, B, is turned so as to bring it verynearly on a line with the centre of rotation of the spindle, thuslocking the bolt. The spring, C, tends to keep the shoulderfrom rising. The simplest and most ingenious mortise door-bolt whichhas come to our attention is the one manufactured by Sargent& Greenleaf, designatedas the Gem mortise-bolt, Figure 57. It con-sists simply of a solidbolt completely fillingthe diameter of the bolt-case. The coggedspindle works over theteeth cut across the last tooth towardsthe back of the bolt issmaller and projects lessthan the others, and thelast cut is wider than theintermediate ones; sothat when the bolt isthrown the cogged spin-dle wedges into the widecut and locks the bok,making it practically im-possible to throw it back by external pressure. The beautyof this bolt is, there is nothing about it that can possibly get Chapter Fig. 56. Cylindrical Door-bolt. Ireland Mfg. Co,
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Keywords: ., bookcentury1800, bookdecade1890, bookidbuildershard, bookyear1890
