Abstract: A U-bolt clamp assembly for securing together the annular overlap of a pair of telescoped engaging pipes having a U-bolt having a semi-circular bight portion terminating in a pair of legs having threaded ends. A saddle plate assembly includes a saddle plate having a concave seat of semi-circular shape and a pair of spaced keys at the upper ends of the saddle plate seat. The saddle plate assembly is apertured at its ends to receive the U-bolt legs. Opposed keyways upon the interior of the legs interlockingly receive the keys. Fasteners upon the U-bolt ends are tightly drawn into compressive engagement drawing together the U-bolt and saddle plate assembly. The U-bolt bight and the concave seat deform both pipes forming concentric annular channels therein and a bead in the outer pipe nested within the channel of the inner pipe so that the U-bolt and saddle are mechanically interlocked with the outer pipe and the pipes are annularly interlocked, secured and sealed throughout 360.degree..

Abstract: A belt buckle to which a plate-like tool can be attached. The belt buckle is constructed of a base plate and a fitting case covering the front side of the base plate so that a fitting space for fitting the tool therein is formed inbetween. In the fitting space, on the other hand, there is mounted a locking plate for holding the tool under its fitted condition. This locking plate is constructed of a retaining portion, which is made engageable with the engagement opening of the tool, and a pressure portion for pushing the back of the tool under its engaging condition to the front. When the tool is to be taken out of the fitting space, a finger is inserted through the aperture of the fitting case thereby to inwardly push the retaining portion of the locking plate so that the tool is extracted under the condition in which the retaining portion is disengaged to the back from the engagement opening of the tool.

Abstract: This invention concerns an installation for signalling the deposit of mail in a letter box, the letter box comprising a movable shutter member in front of a mail insertion slot and an access door for removal of the mail deposited in the letter box.