US 4,907,924 A · Backward starting locknut

Abstract

A backward starting locknut comprises a polygonal-shaped metal nut having a threaded axial bore extending from a front end face normal thereto toward a recess formed in an opposite or backside of the nut body. A locking insert of resilient plastic material having a threaded bore aligned with that of the nut is seated in the recess and includes an annular, thick wall portion secured within the recess and an annular, thin wall portion integrally joined to the thick wall portion and extends outwardly from the recess and is provided with a threaded bore. The metal nut includes an annular wall section defining the recess and the wall section is deflected radially inwardly to compress the thick wall portion of the plastic insert and thereby constrict an inner portion of the threaded bore in order to establish a prevailing torque when a threaded rod is fully engaged in the bore of the insert. The outwardly extending, annular, thin wall portion of the insert permits a threaded rod to be threadedly engaged in the bore from the backside of the locknut so that the locknut can be started onto the threaded rod from the backside and threaded for a distance on the rod before prevailing torque is encountered as the rod end reaches the constricted inner, thick wall portion of the plastic insert.

Claims17

Dependent claims

A backward starting locknut, comprising:

a polygonal-shaped, metal nut having a threaded axial bore extending from an end face normal thereto toward a recess formed on an opposite end;
and
a locking insert of resilient plastic material having a threaded bore aligned with that of said nut and having an annular, thick wall portion mounted in said recess and an annular, thin wall portion projecting outwardly of said recess around said threaded bore;
said nut having an annular wall section defining said recess and deflected inwardly to compress said thick wall portion of said insert radially inwardly to constrict an inner portion of said threaded bore of said insert for establishing a prevailing torque when a threaded element is engaged therein.

1 more element

In combination with a threaded rod having a non-removable enlargement spaced from an outer threaded end portion and a metal element mounted on said rod having a face normal thereto to be adjustably positioned in relation to said enlargement;

a backward threaded locknut, comprising:
a polygonal-shaped metal nut having a threaded axial bore engaged with said threaded rod and an outer end face normal to said rod engaging said face of said metal element for maintaining a selected interval between said metal element and said enlargement on said rod, said nut having an annular recess around said rod facing said enlargement for containing a locking insert;
a locking insert of resilient plastic material mounted in said recess and secured to said metal nut against axial and rotational displacement, said insert having a threaded bore engaged by said rod and including a thick wall portion in said recess and a thin wall portion extending axially outward of said recess toward said enlargement;
said nut having an annular wall section defining said recess with an outer opening facing said enlargement and deflected radially inwardly to exert pressure on said thick wall portion of said insert to constrict an inner portion of said threaded bore for providing a prevailing locking torque between said locknut and said rod to maintain said selected interval.

1 more element

Dependencies are inferred from the claim text.

Backward starting locknut

Life of this patent

Backward starting locknut

Life of this patent

Abstract

Claims17