Micro-adjustable and quick-locking adaptor for electrical junction box

An adaptor for electrical junction box comprising:

• a split sleeve insertable through a wall opening of a box wall of a junction box, and coupled on a cable connector;
• a plurality of resilient chucking members each integrally formed on the sleeve and sloping rearwardly upwardly from the sleeve to be resiliently compressibly engaged with the wall opening;
• each said chucking member having a plurality of ratchet teeth gradationally formed on the chucking member, whereby upon a forward insertion of the adaptor into the wall opening of the junction box, the split sleeve will be resiliently fastened on the cable connector, and the wall opening will be firmly engaged with the ratchet teeth to stably lock the adaptor and the cable connector on the box wall to prevent a backlash movement of the adaptor and the cable connector;
• said adaptor including:
• said split sleeve generally formed as a cylindrical shape and insertable through the wall opening of the box wall and releasably coupled to a front tube portion of the cable connector, a leading edge portion formed on a front end of the sleeve to be contiguous to a front arrow-head portion of the cable connector, and said plurality of resilient chucking members each integrally resiliently formed on the sleeve and sloping rearwardly upwardly from the leading edge portion towards a trailing edge portion of the sleeve to be resiliently compressibly engaged with the wall opening, a notch circumferentially cut out in the sleeve and diverging rearwardly from the leading edge portion towards the trailing edge portion, a pair of ridge portions formed on each said chucking member and respectively juxtapositioned to the notch and each said ridge portion having said plurality of ratchet teeth gradationally formed on the ridge portion;
• having each tooth of the ratchet teeth forwardly sliding over a rim of the wall opening when forwardly inserting the front tube portion of the cable connector through the wall opening, and each said tooth rearwardly retarded by the rim of the wall opening, thereby limiting a backlash movement of the adaptor and the cable connector as coupled with the adaptor.