Abstract: The present invention relates to a piston intended for a hydraulic radial piston motor and being of the type comprising an outer cam ring having an undulated inner cam surface, an inner cylinder block which is rotatable relative to the cam ring and has radially outwardly directed cylinders, a plurality of such pistons which move in said cylinders and cam rolls which rollingly run against the cam surface and are slidingly arranged against the respective pistons. The piston has an essentially cylindrical circumferential surface, an inner end surface and an opposite outer end surface, which is adapted to be slidingly arranged against the cam roll and therefore is formed with a groove-like recess, which in cross-section is essentially part-cylindrical, and with two lateral portions which extend around and partly surround the circumferential surface of the cam roll and via which reaction forces in the tangential direction of the cylinder block are transmitted between the cam roll and the cylinder block.

Abstract: A door for refrigerating and freezing chambers, comprising a door frame supporting one or more glass panes for exposing refrigerated or frozen goods in said chamber through the door. According to the invention, the door frame comprises a section (6) capable to support the glass (4) associated with the door (1) along only one vertical edge (7) of the glass (4), at which edge (7) the door (1) is intended to be hingedly suspended in a door case. An inner longitudinal cavity (10) is located along the entire length of the section (6), in which cavity (10) a torsion spring (11) extends substantially along the entire length of the section (6), which torsion spring (11) is capable to be locked at one end relative to the section (6) and at its other end relative to said door case.

Abstract: A heat exchanger for recovering the heat energy content in furnace waste gases and for recovering much of the dust entrained therewith includes a hollow duct through which the waste gases pass, and which contains first and second tube bundles arranged one after the other and a dust collection surface therebetween. The heat content in the waste gases is transferred to water passing through the two tube bundles and dust is deposited on the dust collection surface.