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'471,199
its head, of a lower member having a vertical notch of the width of said head, the opposing walls of said notch having recesses closed at their outer ends and opening through the up- 5 per side of said member, an upper member hinged at its rear end to the lower and hav- ing a similar notch, tongues on the arms of the upper member passing into said recesses and having rounded lower faces with rubber ro packing secured thereon, and a spring se- cured in the bottom of the notch of the lower member and having a shoulder in its body
passing through and engaging the upper mem- ber when the latter is lowered, the upper end of the spring being curved forwardly, sub- 15 stantially as hereinbefore described. In testimony that I claim the foregoing as my own I have hereto affixed my signature in presence of two witnesses. DAVID WILMER TANNER. Witnesses: M. P. MooDY, D. J. BYNUM.