Backlash free seat adjuster

In an articulated mounting for seats having angularly adjustable backrest, particularly for use in motor vehicle seats, including a stationary hinge part assigned to the seat and a reclinable hinge part assigned to the backrest, a pivot axle for connecting the hinge parts, and an angular position adjuster and arrester in the form of wobble gears including an inner gear connected to one hinge part and being rotatable about said pivot axle, an outer gear connected to the other hinge part and being rotatable about an eccentric member coupled for rotation with the pivot axle, a combination comprising a non-circular coupling section on said pivot axle;

• said eccentric member being a separate piece having an eccentric recess, two opposite walls of said recess slidably engaging corresponding sides of said non-circular coupling to permit radial displacement of the eccentric member on said coupling section;
• means for adjusting and arresting the eccentric position of said eccentric member relative to said coupling section of said pivot axle;
• and wherein said pivot axle includes two separate sections divided along a plane perpendicular to the central axis of said axle, one of said axle sections being integrally connected with a rectangular pin defining said coupling section, said eccentric member being a circular disk having an eccentric rectangular recess engaging with its two opposite walls said rectangular pin and permitting radial movement in the direction of its other two walls, and the other axle section having a central rectangular recess matching said rectangular pin.

In an articulated mounting for seats having angular adjustable backrest, particularly for use in motor vehicle seats, including a stationary hinge part assigned to the seat and a reclinable hinge part assigned to the backrest, a pivot axle for connecting the hinge parts, and an angular position adjuster and arrester in the form of wobble gears including an inner gear connected to one hinge part and being rotatable about said pivot axle, an outer gear connected to the other hinge part and being rotatable about an eccentric member coupled for rotation with the pivot axle, a combination comprising a non-circular coupling section on said pivot axle;

• said eccentric member being a separate piece having an eccentric recess, two opposite walls of said recess slidably engaging corresponding sides of said non-circular section to permit radial displacement of the eccentric members on said coupling section;
• means for adjusting and arresting the eccentric position of said eccentric member relative to said coupling section of said pivot axle;
• and wherein said pivot axle is a one-piece axle defining at each end thereof an axle section and a coupling section therebetween, said coupling section including two opposite parallel coupling surfaces and an abutment surface arranged perpendicularly to the coupling surfaces in the central range of the axle, said eccentric member being a C-shaped disk defining a recess having two opposite flat surfaces matching said coupling surfaces on said axle, said adjusting means being arranged between said abutment surface of said intermediate range and the bottom of the recess of said C-shaped eccentric ring.

In an articulated mounting for seats having angularly adjustable backrest, particularly for use in motor vehicle seats, including a stationary hinge part assigned to the seat and a reclinable hinge part assigned to the backrest, a pivot axle for connecting the hinge parts, and an angular position adjuster and arrester in the form of wobble gears including an inner gear connected to one hinge part and being rotatable about said pivot axle, an outer gear connected to the other hinge part and being rotatable about an eccentric member coupled for rotation with the pivot axle, a combination comprising a non-circular coupling section on said pivot axle;

• said eccentric member being a separate piece having an eccentric recess, two opposite walls of said recess slidably engaging corresponding sides of said non-circular coupling section to permit radial displacement of the eccentric member on said coupling section;
• means for adjusting and arresting the eccentric position of said eccentric member relative to said coupling section of said pivot axle;
• and wherein said pivot axle is a one-piece axle defining two lateral sections and a coaxial coupling section, said coupling section having two opposite coupling surfaces extending in the direction of eccentricity, a radial boring connecting said coupling surfaces and adapted for slidably guiding a spring-biased adjusting member, said eccentric member being in the form of a collar surrounding said coupling section and having a larger inner diameter than is the other diameter of said coupling section, said spring-biased adjusting member abutting against the inner wall of said collar and holding the latter in the eccentric position.