527,998. Windscreen wipers. TRICO PRODUCTS CORPORATION. April 25, 1939, No. 12428. Convention date, Aug. 16, 1938. [Class 138 (i)] In a windscreen wiper of the pivoted arm type in which the wiper blade is readily detachable from the arm, the connection between the two parts is by a stud and slot. As shown, an elongated stud 9 on the wiper blade 1 is received by a slot 10 in the arm 2 and is retained therein by a spring 22 which closes the entrance 11 to the slot. The wiper blade is urged towards the windscreen by the spring 22 and is returned to normal position by the camming action of a ridge 24 in the spring engaging a groove 25 in the wiper blade, limited pivotal movement of the blade being allowed by the shank of the stud 9 engaging curved sides 12 of the slot 10. To permit disengagement of the stud from the slot, the spring 22 is disengaged from a shoulder 19 on the arm 2. In a modification, the stud is of bent sheet metal.