Builder's hardware; a manual for architects, builders and house furnishers . s makes of locks are described, later on. The ordinary form of latch is made with a V-shaped bevel,the long side of the bevel striking against the Robinson, of Boston, was, it is believed, the first topatent an anti-friction strike, as it is called. Figure 286 illus-trates the construction of his device, which is incorporatedinto all of the locks which he is simply an application of theprinciple of the old bell-lever action of the anti-friction strike isto raise the latch-bolt from t
Builder's hardware; a manual for architects, builders and house furnishers . s makes of locks are described, later on. The ordinary form of latch is made with a V-shaped bevel,the long side of the bevel striking against the Robinson, of Boston, was, it is believed, the first topatent an anti-friction strike, as it is called. Figure 286 illus-trates the construction of his device, which is incorporatedinto all of the locks which he is simply an application of theprinciple of the old bell-lever action of the anti-friction strike isto raise the latch-bolt from the bed of thelock and carry it back without frictionon the sides. Actual tests have beenmade proving that it requires less force,acting directly on the side of the anti-friction strike, to force the lever back,than is required to push back the latch by straight pressureagainst the apex of the bevel. Figure 287 shows a form of anti-friction strike used by sev-eral other manufacturers. There is no difference in principlebetween this and the Robinson make, though the appear-. Fig. PAyrez-iep to LOCK CAJE 287. Anti-frhStrike. LOCKi 179 ance is a little different, the Robinson strike being in thecentre of the bolt, while the others are on one side, also in Robinsons strike the pin is on the latch and the slot in the Chapter XI.
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Keywords: ., bookcentury1800, bookdecade1890, bookidbuildershard, bookyear1890
