Unitary adaptor for presser foot attachment

Adaptor for installing invisible type slide fasteners for use in combination with sewing machine presser foot attachments having a foot portion with spaced opposed recesses in the side edges thereof for accommodating reciprocable movement of a sewing machine needle when installing slide fasteners of non-invisible type without said adaptor, said adaptor being integrally formed of a resilient material and having a pair of laterally spaced, longitudinally extending, downwardly opening guide channels for receiving and guiding the coupling element chain of a slide fastener, said channel including an inclined surface engageable with the coupling chain to orient the same upright with respect to the tape of the slide fastener, and retaining means comprising laterally spaced post members extending upwardly from the adaptor and being laterally spaced apart a distance less than the distance between said opposed recesses, said post members having a cross sectional configuration to fit within said spaced opposed recesses in the side edges of said foot and being deflected apart or releasably fitting into said recesses and thereby resiliently gripping said presser foot to retain said adaptor in fixed position on said attachment.