Abstract: A chain saw guide bar has a pair of elongated chain guide plates, which are superimposed with each other and receive a saw chain. Positioning slots extend in the longitudinal direction of the guide plates and receive a pair of fixing stud bolts that project from the main body of the chain saw. A chain-tightening device, which is incorporated into the guide bar, includes a pulley carried by the guide plates in a fixed position distally of the guide slots. One end of a flexible wire is connected to the pulley. The other end of the flexible wire is connected to a circular ring that is slidably received between the guide plates with an opening thereof at least partly registering with the positioning slots. The ring is received on one of the fixing stud bolts. An intermediate portion of the wire is turned partway around a returning member that is stationarily located on a portion of the guide bar proximally of the fixing stud bolt that receives the ring.

Abstract: In order to permit two halves of a hand tool to be quickly separated and then reconnected following an operation such as gaining access to, storing or exchanging a cutting blade, tool or the like, a connector is arranged to require rotation only through about 90° to achieve disconnection/connection. The connector has an engagement/locking feature which can pass through an elongate/shaped opening on one of the two halves, and then be prevented from passing back therethrough when the rotational angle of the connector is changed with respect to the opening and rotates the engaging/locking feature into engagement with an external surface surrounding the elongate/shaped opening.