Page:Popular Science Monthly Volume 88.djvu/531

 Ladder Tipi)ed With Mule's Feet

���This ladder has feet like a mule, and that is why it can be safely tilted in any position. Four cupped pieces of rubber, secured by means of stout pins, swing on the ends of the ladder. They have just enough play to fit any inequalities of the ground or surface against which the lad- der is placed

��NOT c\'ery ladder will stand with perfect safety at almost any angle on rough and unexen ground or on a polished surface. The one shown in the illustrations will, because of the tips which are placed on cither end.

����The mule is among the most sure- footed of animals. From his feet the inventor has taken his cue and made a ladder-tip like a mule's foot. The tip is metal and rubber; the rubber grips the surface on which the ladder rests.

��A

��A New Quick -Acting Wrench QUICK-ACTIXC; wrench invented by Fred G. Rockwood, Mendota,

���with the threads of the movable jaw and tightens it with no loss of time.

The center bar is screw- threaded on

��Wis., has a mo\a- ble jaw which may be released with (he screw-threads ot the jaw-actuating shaft and ([uickK slid into engage- ment with the nut to be loosened. The actuating- shaft then engagcb

��WM

�■■B k'^^"' - ..^^^^1

�m

�.

�■ 0-fiii

■ ■' ■".' ^ ^

�m

�iiLL^H

�■A^tf

�IB

��Upper pictures show movable jaw, loose,

and being locked. Lower picture shows

the wrench used on piping

503

��two sides. To move the slidable jaw quickh', the screw-threads ol the center bar are shifted so that they do not engage the slidable jaw. To lock the jaw, the operator gives the collar a turn.

�� �