Universal joint comprising a pair of crown gear elements confined within a slotted casing

In a universal joint comprising a driving gear and a driven gear each provided with a respective crown gear cluster and a shaft, and a slotted casing confining said driving gear and said driven gear in meshing engagement, said casing comprising an elongated slot through which the shaft of said driven gear projects and along which said driven gear may be moved angularly from a first position in which said driving gear and driven gear are in-line, and a second position in which said driving gear and driven gear are substantially at right angles to one another, the improvement in combination therewith comprising:

• a guide element captive on said driven gear and disposed within said casing, and at least one channel formed in said casing and receiving said guide element, said guide element guiding said driven gear in movement from said first position to said second position.