Abstract: A circular saw blade is formed with a plurality of strain compensating slots which include a number of inner slots extended outwardly from a central bore of the blade and a number of outer slots which are substantially parallel to the inner slots and respectively spaced therefrom in the radial direction and circumferential direction. Each outer slot partially overlaps the nearest inner slot in the radial direction. Each slot has a spiral or circular end portion.

Abstract: An arrangement for treating generally planar workpieces has two shafts provided on their endfaces with carriers for sets of tools. These sets can be moved with their carriers so that all tools of each set move relative to a center plane between the endfaces, and any one tool of the respective set can be placed into a position closest to the center plane during such movement of the entire set of tools.

Abstract: A butcher's meat saw has a housing from which extends a flat guide plate having an edge along which is slidable a blade reciprocated by an eccentric-type drive mechanism within the housing. Either the edge of the guide or the edge of the blade is formed with a groove and the other edge fits in this groove. One of these edges is furthermore formed with laterally opened notches so as to facilitate cleaning of the saw.

Abstract: The invention relates to a spiral saw blade wherein the teeth are divided into two or more groups with gaps or cut-outs between the groups of teeth, such gaps or cut-outs being void of teeth. The gaps or cut-outs are disposed diametrally opposite each other on the spiral saw blade, and, hence, on rotation the centrifugal forces go through the middle point of the saw blade and their maximum values are directed toward the groups of teeth respectively. Also, the invention provides teeth of varying heights with the first tooth of each group of least height and each succeeding tooth of progressively higher height, with a magnitude of height of the lowest compared to the highest no more than 2% of the diameter of the saw blade. The invention also provides a reinforcing salient in front of the first tooth of each tooth group which protects the first tooth from excessive stresses.