Clamping device for cables and the like

• US 4,250,348 A
• Filed: 12/29/1978
• Issued: 02/10/1981
• Est. Priority Date: 01/26/1978
• Status: Expired due to Term

• Current Assignee: Kitagawa Industries Company Limited (Nitto Kogyo Corporation)
• Original Assignee: Kitagawa Industries Company Limited (Nitto Kogyo Corporation)
• Inventors: Kitagawa, Hiroji
• Primary Examiner(s): Reynolds, B. A.
• Assistant Examiner(s): Tone, D. A.
• Application Number:
  US05/974,226
• Time in Patent Office: 774 Days
• Field of Search: 174/65 SS, 285/158, 285/161, 285/162, 285/217, 285/322, 285/343
• US Class Current: 174/655
• CPC Class Codes: F16L 5/06 by means of a swivel nut compressing a ring or sleeve
• CPC Class Codes: H02G 3/065 with means biting into the conductor-insulation, e.g. teeth-like elements or gripping fingers H02G3/0675, H02G3/0683 take precedence

Abstract

A locking device is disclosed, which comprises a hollow cylindrical body having a plurality of annularly disposed independent gripping pieces projected from one end thereof and a clamping pipe threadably engageable about the outer periphery of the cylindrical body about its side of the gripping pieces. An elastic packing pipe is provided by fitting in contact with the inner circumferential faces of the gripping pieces, and the clamping pipe is tapered about the inner circumferential face of an end portion thereof so that about the outer periphery of their top end portions, the gripping pieces can abut against and be pressed radially toward the center of the device by the tapered end portion of the clamping pipe. Also, means such as notches and/or projections directed opposite to the lead direction of the male screw of the cylindrical body are provided, by which the top end portions of gripping pieces and the tapered portion of the clamping pipe are mutually fixed. This locking device is advantageously used for locking a cable or the like to a fixing member such as a wall.

Claims

1. A locking device comprising essentially a hollow cylindrical body having a male screw formed about the outer periphery thereof and a clamping pipe having about the inner circumferential face thereof a female screw engageable with said male screw of the cylindrical body,

said cylindrical body having a plurality of annularly arranged independent gripping pieces projected from one side end of the body,

said gripping pieces including notched portions formed about the inner circumferential face of their portions excluding the top end portion to form elastic leg portions;

said elastic leg portions receiving a packing pipe fitted in the notched portion thereof, the respective ends of said packing pipe abutting onto the respective side walls of said notched portion of the gripping pieces,

said gripping pieces further having about the outer periphery at the top end portion thereof means for stopping and fixing the clamping pipe in the direction opposite to the lead direction of the male screw of the cylindrical body comprising a notch in the outer circumferential surface of each elastic leg portion,

said clamping pipe being formed about the inner circumference of one end portion thereof with a tapered portion to which the outer periphery of the top end portion of each gripping piece abuts, and having at said tapered portion at least one wedge-shaped member engageable with said notches on the gripping pieces in a ratchet-like manner,

wherein the clamping pipe is applied from the top end of the gripping pieces of the cylindrical body and threadably engaged with the cylindrical body, whereby top end portions of gripping pieces are pressed radially toward the center of the locking device to cause the packing pipe to undergo deformation to decrease in its diametral size, said top end portions being sized and spaced so as not to overlap each other,

an annular groove being formed at the side end portion of said notched portion and extending toward the cylindrical body, said annular groove being empty before deformation of said packing pipe and receiving therein an end portion of said packing pipe as the pipe undergoes deformation to decrease its diametral size.

2. A locking device according to claim 1, wherein said annular groove has a sectional configuration deeper radially toward the outside of the cylindrical body so that the packing pipe can be received within the groove more about its radially outer end portion than its other portion.

3. A locking device according to claim 1, wherein said gripping pieces have projections about the inner circumferential face of top end portions thereof.

4. A locking device according to claim 1, wherein said packing pipe is composed of a rubber having a high elasticity.

5. A locking device according to claim 1, wherein said packing pipe includes an annular projection extending radially toward the center of the locking device.

6. A locking device according to claim 1, wherein said cylindrical body has an engaging flange projected about the outer periphery thereof, at a longitudinaly intermediate portion thereof.

7. A locking device according to claim 1, wherein said cylindrical body has at its other end portion opposite of said one end a fixing means for securing the cylindrical body onto a fixing member.

8. A locking device according to claim 7, wherein said fixing means comprises a male screw threaded about the outer periphery of said its other end.

9. The locking device of claim 7 wherein said fixing means is a clamping nut threadably engaged to said other end of the cylindrical body.

10. The locking device of claim 7, wherein said fixing means comprises a female screw threaded on the inner periphery of said other end of the cylindrical body.

11. A locking device according to claim 1, wherein said gripping pieces are formed integrally with said cylindrical body.

12. A locking device according to claim 1, wherein both said cylindrical body including gripping pieces and said clamping pipe are composed of an insulation material.