Builder's hardware; a manual for architects, builders and house furnishers . as burglar-proof as would ordinarily be desirable. The onlyobjection to it is that theconnection between the leverand the locking-post does notallow for much shrinkage inthe sash. V. Cam sash-fasts of winch Fig-ure 199 is a type, are quitedifficult to represent by a drawing. The action of the Flg • lves SasMast- H-B-ives& is as follows: The levers are fastened to the lower the upper lever is turned, the lower, or locking lever, is first thrown out until re- leased from the hook on theup
Builder's hardware; a manual for architects, builders and house furnishers . as burglar-proof as would ordinarily be desirable. The onlyobjection to it is that theconnection between the leverand the locking-post does notallow for much shrinkage inthe sash. V. Cam sash-fasts of winch Fig-ure 199 is a type, are quitedifficult to represent by a drawing. The action of the Flg • lves SasMast- H-B-ives& is as follows: The levers are fastened to the lower the upper lever is turned, the lower, or locking lever, is first thrown out until re- leased from the hook on theupper sash, and then drawnaround and in toward thehub, until both levers are ona line with the edge of thesash, the upper lever movingthrough 180 degrees, whilethe lower lever is moved only90 degrees. Though the ac-tion sounds complicated, thesash-fast is perfectly simplein its construction, and thereis nothing about it that can Fig. 200. Plan ot inside of Figure 199. c -i get out ot order, or evenwear loose, except by such excessive use as would practi- Chapter Cam Sush-fasts. 132 B UILDERS HARD WARE. Chapter VIII. Self-locking Sash-fasts. cally never be given it in a house. There are no springsabout it, consequently it has no automatic action, and in un-locking, care must be taken that the locking lever is turnedclear around, as otherwise it will project beyond the meeting-rail and catch on the sash-muntins. This is really the onlyobjection to it. Figure 200 illustrates the internal construc-tion of this sash-fast. Figure 201 is a very similar sash-fast manufactured by P. &F. Corbin. It differs only in the internal, eccentric arrange-ment. The Reading Hardware Company also manufactures asash-fast very much like the Ives. VI. Self-locking sash-fasts. The Boston sash-fast fliesopen of itself, unless properly locked. Many people believethat a sash-fast should lock itselfthe moment the sash is drawndown, so as to leave no chancesof the windows being unlocked,and, according
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