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MECHANICAL LOCKOUT DEVICE

IP.com Disclosure Number: IPCOM000242976D
Publication Date: 2015-Sep-04
Document File: 4 page(s) / 66K

Publishing Venue

The IP.com Prior Art Database

Abstract

A mechanical lockout device for a load interrupter switch (LIS) is disclosed. The device has a bar shaped body with a hook and an upper locking hole. The hook engages with the upper locking hole in an operator casting of the LIS and the bar shaped body traps the handle shaft in the open position. Subsequently, the device is padlocked to prevent inadvertent operation. The device adds positive LOTO functionality to an electrically operated LIS. Also, the mechanical lockout device design may be incorporated into conventional handles.

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MECHANICAL LOCKOUT DEVICE

BACKGROUND

 

The present disclosure relates generally to lock-out-tag-out (LOTO) locks and more particularly to a device for facilitating LOTO for a load interrupter switch.

Generally, a load interrupter switch (LIS) is applied with power fuses and other protective devices to provide circuit protection. An LIS has a current interrupting rating, under specific circuit conditions, equal to the continuous current rating of the switch at rated voltage.

Various LIS are provided in enclosures or cubicles and are operable externally from one side of the cubicle. Such LIS are further equipped with a quick make and quick break mechanism to open and close the switch. The switch may be actuated via a permanently attached handle or may be motor operated having a removable handle.  The removable handle does not fit tightly enough to function as an effective lockout means and the LIS does not provide other acceptable lockout mechanism for LOTO purposes.

It would be desirable to have an improved mechanical lockout means for this type of LIS.

BRIEF DESCRIPTION OF DRAWINGS

Figure 1 depicts an isometric view of a mechanical lockout device for a load interrupter switch (LIS).

Figure 2 depicts a cross-sectional view of the mechanical lockout device.

Figure 3 is an isometric view of a hook of the mechanical lockout device.

Figure 4 depicts a modified LIS handle that serves both as a handle and the mechanical lockout device described herein.

DETAILED DESCRIPTION

A mechanical lockout device for a load interrupter switch (LIS) is disclosed. The device is designed to facilitate the Lock-Out-Tag-Out (LOTO) of an LIS. The LIS may be motor operated or manually operated.  The device engages with a mechanically operated handle shaft of the LIS.  Figure 1 depicts an isometric view of the mechanical lockout device.

Figure 1

Figure 2 depicts a cross-sectional view of the mechanical lockout device.  The device has a bar shaped body (1) with a...