US 4,361,944 AGranted

Barrel lock ferrule extractor

OwnerEarle B. Hamiltoninventor

Life of this patent

Estimating the term…

Loading patent…

Abstract

An extractor for the flanged tubular ferrule which surrounds the head of the barrel lock of a kilowatt-hour meter comprises an actuating screw and a two-piece clamp. The clamp has a threaded hole and two recesses of different diameters, the larger of which is adapted to fit around the flange of the ferrule and the smaller of which is adapted to fit around the body of the ferrule. To remove the ferrule, the two pieces of the clamp are fitted over the ferrule and then fastened together by bolts. Then the actuating screw is screwed into the clamp until the inner end of the screw abuts against the head of the barrel lock which is inside the tubular ferrule. Continued rotation of the actuating screw in a tightening direction causes the clamp to move outwardly on the threads of the screw and in so doing the captive ferrule is pulled out of the cover housing. Following removal of the ferrule, the barrel lock itself may be removed by a barrel lock extractor, preferably of the type described in my U.S. Pat. No. 4,060,884, granted Dec. 6, 1977.

A ferrule extractor tool for extracting a tubular ferrule from the cover housing of a kilowatt-hour meter which has a split locking ring having outwardly extending end extensions at the location of the split which are screwed together and covered by said cover housing, said cover housing being provided with a barrel lock for preventing removal of said cover housing, said barrel lock having a cylindrical head portion which is covered by said ferrule, said ferrule having an annular rib at its inward end located within said cover housing, said ferrule having an annular flange at its outer end located outside said cover housing, said ferrule extractor tool comprising:

a. a two-piece clamp comprised of two halves adapted to be mated together;
b. each half being provided with a semi-circular threaded portion at one end, a first semi-circular recess portion at the other end, and a second semi-circular flange-receiving recess between said first recess and said threaded portion;
c. said clamp halves being adapted to be bolted together to form a clamp, said clamp having a threaded hole of circular cross section at said one end, a circular first recess having a diameter corresponding to the outside diameter of said tubular ferrule at said other end, and an enlarged circular second recess between said first recess and threaded portion, said second recess having a diameter corresponding to said flange of said ferrule;
and
d. an elongated actuating screw of circular cross section adapted to be threaded into said threaded hole of said clamp, said screw being adapted to be rotated inwardly through said threaded hole of said clamp and into the hollow center bore of said tubular ferrule, the inner end of said screw coming into abutting position against the head of said barrel lock, continued rotation of said screw in the tightening direction causing said clamp to move outwardly on the threads of said screw thereby pulling said ferrule outwardly, thereby to remove said ferrule from said cover housing of said meter.

2 more elements

Abstract

Claims3