Torque limiting device for insulated plug
View Patent ↗An insulated plug for use in a high voltage device includes a torque limiting bolt, including a first hex element, a second hex element, and a shearable shaft element. Alternatively, an insulated plug assembly for use in a high voltage device includes an insulated plug having a torque limiting bolt, where the torque limiting bolt includes a first hex element attached to the insulated plug and a second hex element attached to the first bolt head via a shearable connector, the assembly further including a separate BIP cap.
1. A plug assembly comprising:
an insulative plug body having an end extent;
a first hex nut extending from said end extent of said plug body;
a second hex nut extending from said first hex nut and removably shearable therefrom upon application of torque thereto in excess of a given value; and
a cap seatably attached to said plug body and covering said end extent upon said removal of said second hex nut from said first hex nut.
2. A plug assembly of claim 1 , wherein said cap includes a hex nut accommodating chamber and an annular skirt radially outwardly therearound, said chamber accommodating said first hex nut therein and said skirt surrounding said end extent of said plug body upon said removal of said second hex nut from said first hex nut.
3. A plug assembly of claim 2 , wherein said chamber includes chamber walls engagable with a hex head of said first hex nut.
4. A plug assembly of claim 3 wherein said chamber walls include an inwardly directed resilient male for releasably engaging said hex head and said first hex nut.
5. A plug assembly of claim 3 , wherein said cap includes an opening formed therein for removing said cap from said plug.
6. A plug assembly of claim 3 , wherein said second hex nut includes an elongate shaft attached to one end of said hex head of said first hex nut and a second hex head at the opposite end thereof.
7. A plug assembly of claim 6 , wherein said shaft of said second hex nut is shearable at a location adjacent said hex head of said first hex nut.
8. A plug assembly of claim 1 , further comprising a cup surrounding at least a portion of said second hex nut.
9. A plug assembly of claim 8 , wherein said cup is removable upon removal of said second hex nut from said first hex nut.