High voltage insulator for electrical components having telescoping insulative sleeves

• US 4,481,380 A
• Filed: 08/26/1982
• Issued: 11/06/1984
• Est. Priority Date: 08/26/1982
• Status: Expired due to Fees

• Current Assignee: Alden Products Co.
• Original Assignee: Alden Research Foundation
• Inventors: Swaffield, John D., Wood, Theodore H.
• Primary Examiner(s): Prescott, A. C.
• Assistant Examiner(s): TONE, DAVID
• Application Number:
  US06/411,704
• Time in Patent Office: 803 Days
• Field of Search: 174/52 PE, 174/DIG. 8, 174/91, 337/186, 338/256, 338/257, 338/275, 264/272.15, 264/272.18, 29/855, 29/856, 29/858, 29/859
• US Class Current: 174/520
• CPC Class Codes: B29C 70/72 Encapsulating inserts having non-encapsulated projections, e.g. extremities or terminal portions of electrical components B29C70/742 takes precedence
• CPC Class Codes: B29L 2031/3412 Insulators
• CPC Class Codes: H01B 19/00 Apparatus or processes specially adapted for manufacturing insulators or insulating bodies manufacture of porcelain for electric insulation C04B33/26
• CPC Class Codes: H01C 1/032 plural layers surrounding the resistive element H01C1/028 takes precedence
• CPC Class Codes: H02G 1/145 Moulds
• CPC Class Codes: Y10S 174/08 Shrinkable tubes
• CPC Class Codes: Y10T 29/49171 with encapsulating

Abstract

A high voltage electrical component can be insulated by placing such component into a first sleeve of preformed insulative material dimensioned to receive and telescope over the component. An internal abutment in the first sleeve positions the component for reception of both the first sleeve and component by a second sleeve of preformed insulative material dimensioned to receive and telescope over the first sleeve and component within. An internal abutment in the second sleeve further secures and centers the component and the first sleeve for subsequent encapsulation by insulative materials used with injection molding to form an outer insulative jacket. Once encapsulated within the insulative jacket the telescoping sleeves form a convoluted path outwardly from the component to the exterior of the jacket thereby minimizing high volt leakage.

Claims

1. An insulated high voltage electrical component comprising:

a first sleeve of insulative material telescoping over the component;

a second sleeve of insulative material telescoping over the first sleeve, the first sleeve including an abutment engaging one end of the component and the second sleeve including another abutment engaging the other end of the component; and

a body of insulative material molded around the sleeves to hold the sleeves in telescoped position, the telescoped sleeves forming a convoluted path outwardly from the component.

2. An insulated component according to claim 1 wherein the body has an opening to the second sleeve intermediate the ends thereof and at the end of the convoluted path.

3. An insulated component according to claim 1 wherein the convoluted path is longer than the axial path to the exterior of the body.

4. An insulated component according to claim 1 wherein the component has axial lead wires along which there is a potential leakage path shorter than the convoluted path.

5. An insulated component according to claim 1 wherein the body is of molded thermoplastic material.

6. A method for insulating a high voltage electrical component comprising:

inserting the electrical component into a first sleeve of insulative material telescoping over the component with an abutment on the first sleeve engaging one end of the component;

telescoping the first sleeve and electrical component into a second sleeve of insulative material with an abutment on the second sleeve engaging the opposite end of the component;

encapsulating the sleeves with insulative material to form a molded body confining the sleeves and electrical component in telescoped position.