Abstract: The invention disclosed is an improved scrim means for use in a breathing gas filter assembly which includes a pleated web filter medium. The improved scrim means is of a non-woven microorganism resistant synthetic polymeric material of sufficient rigidity to provide substantially continuous support to maintain the pleats of the filter medium in substantially uniformly spaced relationship, to expedite fluid flow in the plane of the web and to minimize nesting of the filter medium.

Abstract: A one piece frame or channel for a work support which is usable during building or construction principally as a support at ground level or as a scaffold at elevated levels regardless of whether the surface is even, irregular or constitutes different heights. The channel is used in pairs to form the work support. A plurality of legs are conveniently made from two-by-fours which are clamped to the channel at a suitable height in conformance with the ground so as to set the plank horizontally which plank extends across the pair of laterally spaced channels. Top brackets are interlocked in the top portion of the channels to engage and to hold the plank in assembled position.A clamp is carried on leg portions of the channel on an axle journaled in punched support lugs. A spring biases the clamp to engage the legs. Teeth are formed on the clamp to secure the legs in adjusted position.

Abstract: A one piece frame for carrying a platform made from a unitary channel adapted to releasably receive a plurality of support legs. Adjustable top brackets mountable in the channel for supporting the platform connect to the frame to affix thereto.Bracing members on the frame prevent lateral shifting of the support legs. The channel at the leg is notched or recessed to permit a clamp to engage standard and substandard legs commonly made from two (2)-foot-by-four (4)-foot wood. Also, the clamps are provided with a plurality of teeth angularly disposed to engage the adjacent leg substantially perpendicular.

Abstract: A tool guide for providing a stationary support for a portable power tool such as an electric drill. When the lower portion of the device is clamped between the vise jaws of a portable workbench and vise, an electric drill slidably mounted on the device may be used to drill either perpendicular or angular holes in a workpiece positioned on top of the vise jaws. An adjustable depth stop operatively associated with the slideway of the device provides accurate depth control. The device may also be used independently in order to add accuracy to free hand drilling for both perpendicular and angular holes.