Adaptor for windshield wiper arms

In an adaptor and windshield wiper assembly wherein a windshield wiper superstructure comprises a primary yoke having a pair of spaced substantially parallel walls on a portion of its length supporting therebetween transversely extending support means which slidably receive the adaptor, the yoke further including a pair of oppositely located apertures downwardly and longitudinally spaced from said support means and receiving therethrough a pin of a side pin style of wiper arm having a circumferential groove between its ends, the improvement wherein the adaptor has first coupling means receiving and retaining the pin and second coupling means securing the adaptor to the primary yoke in either a pre-assembled position or a fully assembled position;

• the adaptor comprising a pair of transversely spaced walls connected by a web extending therebetween, the spacing between the walls of the adaptor being selected to allow the adaptor to be inserted between said parallel walls of the yoke, said second coupling means comprising a first downwardly extending slot having a bottom end and a top end provided on each of the walls of the adaptor whereby the adaptor engages said support means upon downward relative movement of the adaptor into the yoke, the first slots each having first and second enlargements longitudinally spaced from each other between said ends, the first enlargement being spaced from the bottom end to retain the adaptor on said support means in a pre-assembled position with the adaptor partially inserted in the yoke such that the resulting yoke and adaptor assembly is disposed to receive a free end of a wiper arm, and the second enlargement being spaced from the top end to retain the adaptor on the support means in a fully assembled position with the adaptor fully inserted in the yoke such that the wiper arm is secured to the yoke;
• and
• said first coupling means comprising a pair of oppositely directed shoulders locating in said circumferential groove of the pin and provided on spaced parallel sides extending transversely between the walls of the adaptor, the sides terminating adjacent a second downwardly extending slot provided in each of the walls of the adaptor, the second slots each being parallel to the first slots and terminating in a third enlargement adapted to retain the pin in the fully assembled position, the third enlargement being spaced from the bottom of the adaptor so that the separation of the third enlargement from the apertures in the pre-assembled position of the adaptor corresponds to the separation between the first and second enlargements provided on the first slots.