Cast Iron Spring-Style Sash Lock, Pat. 1879 Item # R0871
The early spring-style sash lock shown here was first patented in 1869 by George McGregor and George Voll, and subsequently assigned to Hopkins & Dickinson who popularized it during the 1870s (and took several manufacturers to court over perceived patent violations). The patents were continually improved, this version being offered after 1879.
Clarance Howard Blackall in his chapter on sash locks in the 1889 book “Builder’s Hardware describes this type of lock thusly: “The lever is on the lower sash hooking under a tooth on the upper sash which is beveled so as to draw the sashes more closely together. A strong spring about the axle of the lever tends to throw it open while a small bolt inside the lever locks into a concealed catch on the post or axle of the lever. The bolt ends in a knob and is fitted with a spring which keeps it pressed tightly towards the center so that the lever is caught and held when it is turned clear around through 90 degrees. On pulling the knob, the catch is released and the lever flies open.”
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