Patent ID: 6334345
Filing Date: 2002-01-01
Classification: B60R,Y10T

Abstract:
A multi-sectional extendible lock structure for steering wheels comprising:a base portion having an inner space formed therein and having a fixing hook on the tailing end thereof; a middle rod section telescopically extending in said inner space of said base portion and also having an inner space with a fixing hook in opposition to said fixing hook on said base portion; a tailing rod section telescopically extending in said inner space of said middle rod section; a core rod extending in said tailing rod section and forming engagement between said middle rod section and said tailing rod section; a lock barrel provided on said base portion with a locking pin thereof extending into said inner space of said base portion to make engagement with said middle rod section; thereby, when said middle rod section is pulled out of said base portion, said fixing hooks are adapted to fixedly mounted on said steering wheel, then by pulling said tailing rod section out of said middle rod section, said steering wheel is locked in a car against rotation; an end wall is provided on an opening of said inner space of said base portion; and an engaging ring is formed on a root portion of said middle rod section to provide engaging action to prevent said middle rod section from dropping off said base portion; said lock barrel is fixedly provided near said opening of said base portion, said locking pin of said lock barrel is extended into said inner space of said base portion to make a stopping action against said root portion of said middle rod section to prevent said middle rod section from retracting into said base portion; said core rod is extended in an inner space of said tailing rod section, one end of said core rod is extended through a sleeve to an end face of said root portion of said middle rod section, a spring member is provided between to abut against said sleeve and said core rod to endue said core rod with a pushing force toward said end face of said root portion of said middle rod section; said core rod is provided with a stop pin on the opposite side of said sleeve to the side that said spring member is abutted against, in order to prevent loosening of said core rod; said tailing rod section is extended between said middle rod section and said core rod, a root portion of said tailing rod section is provided with through holes for inserting therein engaging beads, an annular groove is provided on the front end of said middle rod section for dropping therein said beads, while a protruding head is formed on the front end of said core rod in cooperation with a block provided on the bottom of said inner space of said base portion and is adapted for abutting said core rod, when said tailing rod section is pulled out of said middle rod section, said engaging beads on a root portion of said tailing rod section are pushed into said annular groove from said protruding head formed on said front end of said core rod, said engaging beads thus provide engaging function for said middle rod section and said tailing rod section to prevent said tailing rod section from retracting into said middle rod section, thereby, said lock can be completely stretched out; when said middle rod section is completely retracted to the bottom of said inner space of said base portion, said block provided on said bottom of said inner space of said base portion presses said core rod in said tailing rod section to move said core rod toward the front end of said tailing rod section, such that said protruding head formed on the front end of said core rod moves over the position where said engaging beads are; then said engaging beads drop onto a straight shank of said core rod, at the same time, they get off said annular groove of said middle rod section to release engagement between said middle rod section and said tailing rod section.