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593,875
gear-wheels loosely journaled on said shaft' and engaging rack-bars with said sash and provided with integral ratchet - wheels, and blocks seated to slide in the recesses of said 5 brackets, pawls pivoted in said recesses and having their inner ends in locking engage- ment with the rack-bars of the sash, and cams consisting of a sleeve provided with inclined faces, said cain journaled to the outer ends io of the sliding blocks and adapted to press the outer ends of the pawls together to remove their inner ends from locking engagement
with the ratchets, springs located in the re- cesses of the sliding block and adapted to force the outer ends of the pawls apart, arms 15 secured to said cans and links or rods con- nected to said arms, substantially as set forth. In testimony whereof I hereunto affix my signature in presence of two witnesses. LAUREN A. CROCKER. Witnesses: A. A. WHEATLEY, J L. EPHRAIM.