Locking mechanism for transformer enclosure door

Details Locking mechanism for transformer enclosure door Locking mechanism for transformer enclosure door

1997-11-17

2000-08-22

Dayoan, B.

Closure fasteners

Bolts

Screw

29234117, 411433, E05C 504

Patent

active

061060356

ABSTRACT:
A locking mechanism for a door, such as the door of a transformer enclosure, includes a rotatable threaded locking member secured to the door. The locking member is spring biased outwardly, and stationary engagement structure is provided for engaging the threaded locking member when the door attains a predetermined position as the door approaches its closed position. The engagement structure includes a pair of spaced apart engagement members, which are preferably threaded so as to engage the threads of the threaded member as the door is moved toward its closed position. The threaded locking member can than be pushed inwardly, and the engagement members are biased to provide a ratcheting mechanism to prevent the threaded locking member from being withdrawn from between the engagement members. The threaded locking member can than be turned to fully lock the door in its closed position and an auxiliary lock, such as a padlock, is then utilized in combination with the threaded locking member to prevent access to the head of the threaded locking member and to provide a backup lock for securing the door in its closed position.

REFERENCES:
patent: 971375 (1910-09-01), Hays
patent: 1856091 (1932-07-01), Dina
patent: 2401672 (1946-06-01), Tinnerman
patent: 2814324 (1957-06-01), Shur
patent: 3089330 (1963-05-01), Kerr
patent: 3194107 (1965-07-01), Ballard
patent: 3784727 (1974-01-01), Haubein
patent: 4113291 (1978-09-01), Cameron
patent: 4533786 (1985-08-01), Borgmeyer et al.
patent: 5739464 (1998-04-01), Adkins et al.
"High Performance Distribution Transformers" Product Guide, Bulletin No. 91016, Mar. 1992, Cooper Power Systems, Transformer Products, 1900 E. North Street, Waukesha, WI 53188-3899.
"Transformer Enclosures...Better Built for Superior Protection and Saftey", Bulletin No. TE-2 8/86/3M, 1986, Maysteel Corporation, Fabrication Division, 800 Horicon Street, Mayville, WI 53050.
"Primary Sectionalizing Enclosures & Ground Sleeves", undated, Maysteel Corporation, Columbus Division, 100 Continental Drive, Columbus, WI, 53925-0248.

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