Tilted axle caster

Claim 1

IN A CASTER OF TILTED AXLE TYPE, A GENERALLY HOLLOW UNITARY SWIVEL BODY MEMBER MOLDED TO A MODIFIED THIN WALLED CUP-SHAPED FORM OF SUBSTANTIALLY GREATER HEIGHT THAN WIDTH AND CHARACTERIZED BY A CIRCULAR SUBSTANTIALLY DISC-LIKE VERTICAL CROSS WALL MERGING WITH AN ANNULAR SIDE WALL EXTENDING FROM THE PERIPHERY OF SAID CIRCULAR VERTICAL WALL AND TERMINATING IN AN ANNULAR EDGE DEFINING AN OPEN FACE IN A TILTED PLANE DISPOSED AT AN ANGLE TO THE VERTICAL WALL SUCH THAT THE OVERALL HORIZONTAL WIDTH DIMENSION OF THE CUP-SHAPED FORM VARIES PROGRESSIVELY FROM A MAXIMUM WIDTH AT THE UPPER EXTREMITY OF THE VERTICAL WALL OF A MINIMUM WIDTH AT THE LOWER EXTREMITY OF THE VERTICAL WALL, SAID BODY MEMBER HAVING INTEGRAL WALL MEANS LOCATD PRIMARILY WITHIN A LATERALLY OFF-CENTER REGION OF SAID HOLLOW SWIVEL BODY AND EXTENDING VERTICALLY MORE THAN ONE HALF THE HEIGHT OF SAID BODY MEMBER TO TERMINATE IN A LOWER PORTION THAT PROJECTS THROUGH AN ECCENTRIC REGION OF THE MEETING PLANE AND EXTENDING AT ITS UPPER AND BEYOND AND OUTSIDE OF SAID ANNULAR SIDE WALL TO DEFINE UPWARDLY OPENING GENERALLY CYLINDRICAL VERTICAL SWIVEL SOCKET, SAID SWIVEL BODY MEMBER HAVING INTEGRAL RIBS INTERNALLY ALONG ITS CROSS WALL AND EXTENDING BETWEEN SAID SIDE WALL AND THE SOCKET DEFINING INTEGRAL WALL MEANS, A UNITARY CASTER WHEEL MEMBER DISPOSED OVER AND IN OPPOSED CLOSING GENERALLY PARALLEL RELATION TO THE OPEN FACE OF SAID SWIVEL BODY MEMBER AND OF GENERALLY SYMMETRICAL THIN WALLED CUP-SHAPED FORM OF SUBSTANTIALLY GREATER HEIGHT THAN WIDTH AND CHARACTERIZED BY A SUBSTANTIALLY DISC-LIKE CIRCULAR CROSS WALL MERGING WITH A SIDE WALL OF UNIFORM WIDTH AND CONSTITUTING A TREAD FOR THE CASTER WHEEL MEMBER, THE LAST-NAMED SIDE WALL DEFINING A PLANAR OPEN FACE PARALLEL TO THE LAST NAMED CROSS WALL, SAID WHEEL MEMBER HAVING INTEGRAL RADIAL RIBS INTERNALLY ALONG ITS CROSS WALL AND MERGING WITH SAID SIDE WALL, SAID RADIAL RIBS BEING RECESSED FROM THE LAST NAMED OPEN FACE TO PROVIDE AN ANNULAR CLEARANCE POCKET FOR THE LOWER PORTION OF SAID SOCKET DEFINING INTEGRAL WALL MEANS, AN AXLE ELEMENT AND AN EMBRACING BEARING SLEEVE ELEMENT DISPOSED WITHIN AND BETWEEN THE SWIVEL BODY MEMBER AND WHEEL MEMBER EACH TO EXTEND CONCENTRICALLY AND PERPENDICULARLY TO SAID OPEN FACES, SAID AXLE ELEMENT HAVING ONE END FIXEDLY RETAINED BY A MOLDED INSERT IN THE CROSS WALL OF ONE OF SAID MEMBERS AND SAID BEARING SLEEVE ELEMENT HAVING ONE END INTEGRALLY MERGING WITH THE CROSS WALL AND RIBS OF THE OTHER OF SAID MEMBERS.