Abstract: Provided is a hacksaw comprising a front cavity in a tang of the frame, a resilient member having one end fastened in one side of the cavity, a handle for receiving the tang and a top opening aligned with the cavity, a pivotal lock lever disposed in the opening and comprising an arm and an end urging member (e.g., cam), a blade inserted through the cavity and the tang into the handle. A thin portion of the urging member is disposed proximate the resilient member and the resilient member is disengaged from the blade when the arm is disposed in a forward position. To the contrary, a thick portion of the urging member is pressed down on the resilient member for fastening a back of the blade when the arm is disposed in a rearward position.

Abstract: An acoustic absorptive splitter consisting of two absorptive faces separated by a single on-quarter wavelength cavity support is disclosed as an equal substitute for a multi-layered splitter containing a central septum. This construction takes advantage of the reflective properties of the absorptive face sheets to support standing waves in the tuning cavities and in the duct cross modes. The utilization of these design principles permits significant silencer size and weight reduction. It also permits reduced splitter manufacturing costs by elimination of two layers of materials, difficult internal bonding and improvements in quality.

Abstract: A cutting shear which is formed of a pair of members pivotally mounted in a scissors arrangement. Each member has a jaw member and a handle member, and within one of the handle members is mounted an internal chamber which is closeable by a removable cap located at the outermost end of this handle member. A bail is mounted on the cap and is to be connectable with the opposite handle member to lock the cutting shear in a closed position. One of the jaw members includes a cutting blade with the cutting blade having a cutting edge which is mounted non-parallel to its jaw member.