Expansion fitting for electrical conduits

Claim 1

AN EXPANSION FITTING COMPRISING TWO ELEMENTS, ONE TELESCOPED WITHIN THE OTHER, AND A SPRING CLIP FOR HOLDING THEM IN ASSEMBLED RELATIONSHIP, EACH ELEMENT BEING TUBULAR AND HAVING CONNECTING MEANS AT ITS OUTER END WHEREBY IT MAY BE ATTACHED TO A CONDUIT OR THE LIKE, THE OUTER ELEMENT HAVING AN INTERIOR BEARING SURFACE AND THE INNER ELEMENT HAVING AN EXTERIOR BEARING SURFACE COMPLEMENTARY TO THE SAID INTERIOR SURFACE, THE INTERIOR SURFACE ON THE OUTER ELEMENT HAVING A GREATER AXIAL LENGTH THAN THE OUTER SURFACE OF THE INNER ELEMENT, WHEREBY THE SAID SURFACES MAY REMAIN IN ENGAGEMENT DURING TELESCOPING OF THE TWO ELEMENTS WITH RESPECT TO EACH OTHER, THE TWO SURFACES HAVING A CLOSE FIT AND THE SURFACE ON THE OUTER ELEMENT HAVING A SUFFICIENT LENGTH TO INHIBIT THE FORMATION OF FLAME PATHS, FROM INSIDE THE ELEMENTS TO THE OUTSIDE THEREOF, THE INNER ELEMENT BEING REDUCED IN DIAMETER OUTWARD OF ITS AFOREMENTIONED EXTERIOR BEARING SURFACE, TO PROVIDE A SHOULDER BETWEEN THE TWO SURFACE PORTIONS, THE INNER SURFACE OF THE OUTER ELEMENT ADJACENT ITS END HAVING A RECESS THEREIN; AND REMOVABLE STOP MEANS, THE SAME BEING CONTRACTIBLE TO FIT BETWEEN THE REDUCED EXTERIOR SURFACE ON THE INNER ELEMENT AND THE INNER SURFACE ON THE OUTER ELEMENT, AND THEN BEING EXPANDABLE INTO SAID RECESS TO BE SECURED AGAINST AXIAL MOVEMENT RELATIVELY TO THE OUTER ELEMENT, WHEREBY TO BE ENGAGEABLE WITH THE SHOULDER TO LIMIT EXTENSION OF THE TWO TELESCOPIC ELEMENTS, AND THE SAID RETAINING MEANS HAVING RESILIENT AND FIRM ENGAGEMENT WITH BOTH ELEMENTS TO ESTABLISH ELECTRICAL CONTACT FROM ONE ELEMENT TO THE OTHER.