Patent ID: 6971292

Claim:
A fastener-driving tool assembly comprising: a fastener-driving member including a first end and a second end for driving a fastener, the first end of the fastener-driving member including a polygonal opening; and a coupling device including a first member and a second member, the second member having a polygonal first end securely engaged with the polygonal opening of the fastener-driving member and a second end, the first member including a first end for engaging with the second end of the second member and a second end, the second end of the first member including a polygonal engaging hole for engaging with one of an extension rod, a handle, and a polygonal first end of a second member of a similarly constructed coupling device, with the first end of the first member and the second end of the second member being pivotally connected, and with the first end of the first member being retained in a desired angular position relative to the second end of the second member, wherein the second end of the second member is arcuate and includes a plurality of teeth on a periphery thereof, with a pin hole extending through the second end of the second member, the first end of the first member defining a space for receiving the second end of the second member and allowing pivotal movement of the second end of the second member, a pin extending through the first end of the first member and the pin hole of the second member, wherein the first end of the first member includes a pair of lugs that define the space therebetween, wherein a receptacle is defined in a bottom wall delimiting the space and includes a first section distal to the lugs and a second section, the first section having a diameter smaller than that of the second section, an elastic element and an actuating member being received in the second section of the receptacle, the actuating member including a first end received in the second section of the receptacle and a second end received in the first section of the receptacle, the first end of the actuating member including a toothed portion engaged with the teeth of the second member under action of the elastic element.