Circuit breaker lockout system with tie-receiving channels

Patent metadata

Field	Value
Publication number	US-9966205-B1
Application number	US-201715452608-A
Country	US
Kind code	B1
Filing date	Mar 7, 2017
Priority date	Mar 7, 2017
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

A lockout system for preventing a push-pull circuit breaker from being depressed while personnel work on de-energized electrical equipment. The lockout system includes an attachment member having a generally C-shaped collar defining a cylindrical recess integrated with a retainer member. The C-shaped collar is configured to resiliently expand in order to be positioned over and receive a cylindrical portion of an extended circuit breaker knob such that engagement of the circuit breaker is prevented. The retainer member includes a first channel member and a second channel member, each with a channel connected by a crossover channel that forms a continuous channel configured to receive a wire cable. Once inserted, the wire cable is firmly held in place by a locking chamber attached at each end of the wire cable, and thereafter, the lockout device can only be removed by a cutting the wire cable with a wire cutting tool.

First claim

What is claimed is:

1. A lockout device configured to be removably received over a cylindrical portion of a push-pull circuit-breaker knob, the lockout device comprising:
an attachment member having a generally C-shaped collar defining a cylindrical recess therein, the collar being configured to be resiliently expanded to be positioned over and receive the cylindrical portion of the circuit-breaker knob and then contract, in a manner that prevents the circuit breaker knob from being depressed to close the circuit breaker; and
a retainer member depending from and integrated into the attachment member, having a first channel member and a second channel member, each channel member having a channel that forms a cable channel configured to secure and hold in place a wire cable that, when threaded into the retainer member and tightened, holds the lockout device in place on the cylindrical portion of a push-pull circuit-breaker knob; and
a locking mechanism having a first passageway configured to accept and receive a first end of the wire cable and a second passageway configured to accept and receive a second end of the wire cable after its insertion into and through the cable channel.

2. The lockout device of claim 1 , wherein the attachment member and the retainer member of the lockout device are made from the group consisting of acrylonitrile butadiene styrene (ABS), polymethyl methacrylate (PMMA), polystyrene, and combinations of the foregoing.

3. The lockout device of claim 1 , wherein each channel of the first channel member and the second channel member includes a horizontal portion and a vertical portion, and the channel of the first channel member and the channel of the second channel member are connected by a crossover channel; and
wherein the first channel member, the second channel member, and the crossover channel all form the cable channel.

4. The lockout device of claim 3 , wherein the generally C-shaped collar includes a first free end attached to the first channel member and a second free end attached to the second channel member, wherein the generally C-shaped collar is enabled to flex apart at the first free end and the second free end to be positioned over and receive the cylindrical portion of an extended circuit breaker.

5. The lockout device of claim 4 , further including a gap separating the generally C-shaped collar of the attachment member at the first free end and the second free end, and separating the first channel member from the second channel member of the retainer member.

6. A lockout system for preventing actuation of a push-pull circuit breaker knob, the lockout system comprising:
a lockout device comprising:
an attachment member having a generally C-shaped collar defining a cylindrical recess therein, wherein the C-shaped collar resiliently expands to be positioned over and receive a cylindrical portion of the circuit breaker knob when extended and contracts when in position; and
a retainer member depending from and integrated with the attachment member, having a first channel member and a second channel member;

forming a cable channel in the retainer member and configured to secure and hold in place a wire cable having a first end and a second end; and
a locking mechanism having a first passageway configured to accept and receive the first end of the wire cable and a second passageway configured to accept and receive the second end of the wire cable.

7. The lockout system of claim 6 , wherein the locking mechanism includes a locking chamber having two passageways configured to receiving either the first end or the second end of the wire cable inserted therein and tightening the locking chamber on the locking device when the first end is pulled through one passageway and the second end is pulled through the other passageway.

8. The lockout system of claim 6 , wherein the wire cable is a flexible steel cable conforming to applicable U.S. Occupational Safety and Health Administration (“OSHA”) regulations.

9. The lockout system of claim 6 , wherein the locking mechanism includes two pull-to-tighten passageways, each configured to receive either the first end or the second end of the wire cable.

10. The lockout system of claim 6 , where the cable channel comprises a first channel in the first channel member, a second channel in the second channel member, and a crossover channel connecting the first channel and the second channel.

11. The lockout system of claim 10 , wherein the first channel includes a horizontal portion and a vertical portion, and the second channel includes a horizontal portion and a vertical portion.

12. The lockout system of claim 6 , wherein the generally C-shaped collar includes a first free end attached to the first channel member and a second free end attached to the second channel member, wherein the generally C-shaped collar is enabled to flex apart at the first free end and the second free end to be positioned over and receive a cylindrical portion of an extended circuit breaker.

13. The lockout system of claim 12 , further including a gap separating the generally C-shaped collar of the attachment member at the first free end and the second free end, and separating the first channel member from the second channel member of the retainer member.

14. A method of installing and removing a lockout system for preventing actuation of a push-pull circuit breaker knob, the method comprising:
disengaging the circuit breaker knob from a circuit breaker on a circuit breaker panel;
applying a lockout device having an attachment member and a retainer member about an actuating cylindrical portion of the disengaged circuit breaker knob, the attachment member having a generally C-shaped collar defining a cylindrical recess therein, the C-shaped collar being configured to be resiliently expanded to be positioned over and receive the actuating cylindrical portion and to contract when in position, and the retainer member having a cable channel formed therein and configured to secure and hold in place a wire cable having a first end and a second end;
threading the wire cable through the cable channel so that the first end of the wire cable extends beyond the first channel member and the second end of the wire cable extend beyond the second channel member;
pulling the first end of the wire cable through a first passageway in a locking chamber;
pulling the second end of the wire cable through a second passageway in the locking chamber until the locking chamber is firmly held against the lockout device; and
removing the locking device from the push-pull circuit breaker knob by cutting the wire cable with a wire cutting tool.

15. The method of claim 14 , wherein the C-shaped collar is wedged between a head portion of the circuit breaker knob and the circuit breaker panel to prevent the circuit breaker knob from being depressed to engage the circuit breaker.

16. The method of claim 14 , further comprising the step of attaching a tagout device to the locking device, the step comprising:
attaching an attachment means to the wire cable of the lockout device; and
attaching a tag to the attachment means.

17. The method of claim 16 , where the attachment means is a one-piece, all environment-tolerant nylon cable tie.

18. The method of claim 14 , wherein the wire cable is a flexible steel cable conforming to applicable U.S. Occupational Safety and Health Administration (“OSHA”) regulations.

19. The method of claim 18 , wherein the first passageway and the second passageway of the locking chamber are pull-to

Assignees

• Boeing Co

Inventors

• Dixon Robert Dean
• Swineford Thomas R

Classifications

• H01H9/20 Primary

  Interlocking, locking, or latching mechanisms · CPC title

• H01H9/287

  wherein the operating part is made inaccessible or more difficult to access by a lid, cover or guard, e.g. lockable covers · CPC title

• H01H71/1054 Primary

  Means for avoiding unauthorised release · CPC title

• H01H9/286

  making use of a removable locking part acting directly on the operating part (H01H9/281 takes precedence) · CPC title

• H01H73/56

  reset by push-button, pull-knob or slide · CPC title