A New Automatic Window-catch (or Sash Fastener) Securer.

摘要

10,121. Page, J. H. C. May 1. Sash fastenings.-The ordinary pivoted-arm sash fastening is automatically retained in the fastened position by means of a crescent-shaped hook e pivoted at f to the sash rail, for fastenings already in use, but pivoted to the plate d in new fastenings. To prevent rattling, the point of the hook may engage serrations h in the arm a.