Locking device for locking two elements that are articulated relative to one another

Claim 1

A single roller locking device for locking a relative position of a stationary and a mobile element that are articulated relative to one another; said locking device comprising: a casing of an essentially trapezoidal shape connected to the stationary element; a rod with a central portion and two lateral guides of a reduced height relative to said central portion, said rod penetrating said casing; a member having a V-shape with a first and a second side portion, a top portion, and a bottom portion, said first side portion being connected to said casing and said second side portion having a cutout with a lower rounded portion and an upper straight portion extending at an angle of approximately 45° relative to the rod, said top portion having a fork with two arms for engaging therebetween said central portion of said rod in a locking position of said looking device; each said arm having a triangular recess with teeth, said recesses open to said top portion and facing each other; a toothed roller positioned within said recesses, said toothed roller cooperating with said teeth of said recesses and, in said locking position, pressed against said central portion of said rod; a spindle rotatably supported within said casing; a cam having a flat portion and a finger, said cam fixedly connected to said spindle and said flat portion cooperating with said upper straight portion; and a return spring connected with one end thereof to said casing and with the other end thereof to said spindle, with said finger disengaging said toothed roller from said rod upon rotation of said spindle with said cam against the force of said return spring.