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(11)    Patent No :    AP 1998   
(21)    Application No :    AP/P/2005/003421   
(22)    Filing Date :    29.04.2004   
(24)    Date of Grant &    30.04.2009   
           
(45)    Publication :

(30)  Priority Data       
(33) Country    (31) Number    (32) Date
US    10/425,934    30.04.2003
US    10/824,490    15.04.2004

(84)    Designated State

GH   T Z   ZM
 

(73) Applicant(s)

ESCO CORPORATION, 2141 N.W. 25th Avenue, Portland,

OR 97210,
United States of America

(72) Inventors

BRISCOE Terry L, United States of America


(74) Representative

HONEY & BLANCKENBERG
 

(51)    International  Classification   E02F 9/28 (2006.01)


(54)    Title

Releasable coupling assembly

(57)    Abstract

A lock (10) that includes a wedge (12) and spool (14) are used to releasably secure separable components of an assembly together. The wedge (12) and spool (14) are threadedly coupled together to drive the wedge into and out of an opening in the assembly without hammering or prying. The direct coupling of the wedge (12) and spool eliminates the need for bolts, washers, nuts and other hardware so as to minimize the number of pans. As a result, the lock is inexpensive to make, easy to use, and unlikely to become inoperative because

of lost or broken parts or due to fines or other difficulties encountered in harsh digging environments. Further, the wedge (12) can be driven into the assembly to provide the degree of tightness necessary for the intended operation and/or to re -tighten the assembly after incurring wear during use. A


(56)  Documents Cited :    US 5 964 547 A

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