Kuhlman Corporation

Kuhlman Electric Corporation

John L Fisher

Joe E Curtis, Jr

Clair E Piatt

Herbert J Macemon

John E Cloyd

Richard W Martin

Ronald F Dornbrock

James D Richerson

Randall L Schlake

Stephen D Smith

William R Fortenberry

J Donald Richerson

Kenneth E Marrett, Sr

Hubert L Mohney

Thomas H Aishton

Paul H Winbigler

Richard W Wiedo

J Richard McClelland

Vance Martin

James F Rafferty

A fuse holder (2) for use in electrical apparatus includes a tubular body (6) having outer and inner ends (10, 16). A first electrical contact element (22) and a mounting flange (8) are secured to the inner and outer ends, preferably using resilient retaining rings (53, 68) engaging circular grooves (52, 20; 62, 20) formed in the opposed surfaces. A tubular second electrical contact element (32) is secured within the tubular body and preferably has a flexible electrical terminal strap (24) which extends out through an opening (23) formed in the tubular body. Fluid-tight seals are provided between the inner surface (14) of the tubular body and the outer surfaces (46, 58, 30) of the first and second electrical contact elements and the mounting flange assembly by using pairs of O-rings (38, 50 and 70); an adhesive (39) is also used to secure these elements to the body.

Method for assembling a fuse holder

Fuse holder and method for assembling

A toroidal electrical transformer having a low voltage coil, a high voltage coil and an annular magnetic core is disclosed. The preferred low voltage and high voltage coils are each continuous and form an arcuate elongated passage therethrough. The preferred annular magnetic core is wound in place in said arcuate elongated passage substantially from a continuous strip of magnetic material resulting in a toroidal transformer with continuous windings and a continuous wound core. Various components and sub-assemblies are also disclosed along with various apparatus and methods for producing such toroidal electrical transformers, its components and its sub-assemblies.

Apparatus and method for winding a strip of material into an arcuate

The invention is directed to a formed metal blocking, for mounting within wedge-shaped gaps between coils of a toroidal transformer, including butterfly-shaped top and bottom core blockings. The blockings are formed from identical stampings, each stamping having a pair of U-shaped coil-engaging faces joined along their inner legs by a center web. The stampings are joined back to back and have a number of flanges which are bent over for securing the stampings to one another. The stampings have an apertured tab at the end of the center web used to form a lifting eye for the top blocking. With the bottom blocking, the tabs are folded over for mounting to a base plate. The outer legs of the U-shaped faces are longer than the inner legs and center web to create a gap in the electric path surrounding the core.

Formed metal core blocking method

The invention is directed to a formed metal blocking, for mounting within wedge-shaped gaps between coils of a toroidal transformer, including butterfly-shaped top and bottom core blockings. The blockings are formed from identical stampings, each stamping having a pair of U-shaped coil-engaging faces joined along their inner legs by a center web. The stampings are joined back to back and have a number of flanges which are bent over for securing the stampings to one another. The stampings have an apertured tab at the end of the center web used to form a lifting eye for the top blocking. With the bottom blocking the tabs are folded over for mounting to a base plate. The outer legs of the U-shaped faces are longer than the inner legs and center web to create a gap in the electric path surrounding the core.

Formed metal core blocking

A toroidal electrical transformer having a low voltage coil, a high voltage coil and an annular magnetic core is disclosed. The preferred low voltage and high voltage coils are each continuous in substantial part over their length and form an arcuate elongated passage therethrough. The preferred annular magnetic core is wound in place in said arcuate elongated passage substantially from a continuous strip of magnetic material. Various components and sub-assemblies are also disclosed along with various apparatus and methods for producing such toroidal electrical transformer, its components and its sub-assemblies.

Toroidal electrical transformer and method of producing same

A toroidal electrical transformer having a low voltage coil, a high voltage coil, and an annular magnetic core is disclosed. The preferred low voltage and high voltage coils are each fabricated in two semitoroidal sections which together form an arcuate elongated passage therethrough. Two bobbin halves are inserted into the semitoroidal sections of the low and high voltage coils and are joined to form a cylindrical bobbin within the arcuate elongated passage. The preferred annular magnetic core is wound onto the bobbin within the arcuate elongated passage substantially from a continuous strip of magnetic material resulting in a toroidal transformer with continuous windings and a continuous wound core. Various components and sub-assemblies are also disclosed along with various apparatus and methods for producing such toroidal electrical transformers, its components and its sub-assemblies.

Apparatus and method for winding a toroidal magnetic core onto a bobbin

A toroidal elecrical transformer having a low voltage coil, a high voltage coil and an annular magnetic core is disclosed. The preferred low voltage and high voltage coils are each continuous and form an arcuate elongated passage therethrough. The preferred annular magnetic core is wound in place in said arcuate elongated passage substantially from a continuous strip of magnetic material resulting in a toroidal transformer with continuous windings and a continuous wound core. Various components and sub-assemblies are also disclosed along with various apparatus and methods for producing such toroidal electrical transformers, its components and its sub-assemblies.

Apparatus and method for winding a magnetic core for toroidal transformer

Apparatus and method for fabricating a high voltage winding for a

Apparatus and method for fabricating a low voltage winding for a

An improved magnetic core for an electrical transformer, and a method and apparatus for forming the core, are disclosed wherein the corners of core windows are configured to decrease the magnetic path length, thereby reducing the core losses and the amount of material necessary to construct the core. One exemplary embodiment includes a core window opening having an outer corner radii that are larger than the inner corner radii. Alternatively, the core window may have corners of a non-constant radii, with the outer corners having a more gradual or gentle curvature. These and other disclosed embodiments also enhance the ease of assembly of the transformer core and thus decrease or eliminate damage to the magnetic material during assembly.

Transformer core and method and apparatus for forming same

A fuse holder for a transformer comprising a generally tubular housing secured at one end to the transformer end wall and enclosing the fuse. A tapered resilient adapter sleeve is disposed within the outer end of the housing and carries a bushing well for a high voltage line adapter. The adapter sleeve seals the housing interior. An annular clamp secured to the transformer wall holds the adapter sleeve and fuse holder housing in place. The inner end of the air type fuse is connected to the transformer primary winding by a helical coil spring compressed between a projection on the fuse and a stainless steel tube. The fuse and bushing well are removable by detaching a clamp ring on the outside of the transformer and slipping the parts out through the adapter sleeve and housing. The construction permits immersion of the air type fuse and insures isolation and de-energization of the internal transformer parts upon opening of the fuse.

Fuse holders for transformers

A coolant displacement material for a liquid cooled transformer consisting of a plurality of glass spheres having one or more closed voids to provide a specific gravity which is greater than oil so that the glass spheres remain submerged without need for securing devices and is substantially less than the specific gravity of solid glass material so as to not unnecessarily contribute to the weight and consequent shipping cost of the coolant displacement material and the completed transformer assembly. The spheres provide venturi-like flow passages which enhance thermal transfer between the transformer and the coolant by increasing the flow velocity of the coolant to break down surface-effect thermal barriers. The glass spheres are sufficiently small in size to conform to a substantial portion of the space between the transformer and tank. The wall thickness of the spheres at their exterior surface is sufficiently great so that the glass spheres are substantially non-disintegrating during loading of the spheres into the tank.

Growing community of inventors

Lexington, KY, United States of America

John L Fisher