Builder's hardware; a manual for architects, builders and house furnishers . Fig. 206. Shaws Sash-fast. Nichols & Fig. 207. Davis Sash-fast. Sise, GibsonBellamy, Agents. & Co. tion shown by the figure. The only spring used is one whichpushes out B when A is released. This sash-fast is very. Fig. 208. Byams Sash-fast. Byam, Stewart & Baker. nicely made, and is about as good a self-locking form asis in the market. It has an added advantage in that it locks 136 BUILDERS HARDWARE. Chapter VIII. Sash-fastswhich lock indifferent posi-tions. fT^I itself before the sash is entirely closed, the post, C
Builder's hardware; a manual for architects, builders and house furnishers . Fig. 206. Shaws Sash-fast. Nichols & Fig. 207. Davis Sash-fast. Sise, GibsonBellamy, Agents. & Co. tion shown by the figure. The only spring used is one whichpushes out B when A is released. This sash-fast is very. Fig. 208. Byams Sash-fast. Byam, Stewart & Baker. nicely made, and is about as good a self-locking form asis in the market. It has an added advantage in that it locks 136 BUILDERS HARDWARE. Chapter VIII. Sash-fastswhich lock indifferent posi-tions. fT^I itself before the sash is entirely closed, the post, C, beingdouble notched on the face so that A will slip down andwedge the hook B when the window is within about a quarterof an inch of being closed. It will be observed that the lock-ing is effected entirely by the piece A. B is brought over thehook on the lower sash merely in order to draw the meeting-rails more closely together. The Byam sash-fast, Figure 208, is a very simple deviceacting entirely by gravity, the central bent lever being socounterbalanced that the lower arm will always project overthe lower sash. The section will show how this lever ishung. VII. Sash-fasts which loch in different positions. Thedifficulty with all sash-fasts of this description is that, of nece
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