Abstract: The control element according to the invention which for example can be in the form of a pushbutton switch or display element, is intended to be fastened to a front panel having at least one circular opening. It has a housing with an essentially cylindrical section and, at its front, a collar projecting radially outward and beyond the cylindrical section. The cylindrical section is provided with at least one all-around groove in which a ring of an elastically deformable material is present. When the control element is inserted into the front panel, it is fixed into the opening by virtue of the fact that a support surface of the collar rests on the front plate on the one hand and by the ring being pressed against the lateral surface of the groove by the lower edge of the opening on the other hand.

Abstract: The invention encompasses method and apparatus for cleaning screen used in screen printing machine for printing of solder paste onto a surface of a printed circuit board. The apparatus includes two upper and lower cleaning chambers 4, 5 which are provided on upper and lower sides of the screen 2 in opposed relationship with each other in such a manner that the two chambers are in watertight contact with the upper and lower surfaces 2A, 2B, of screen 2, respectively and are communicated with each other through openings 2C in the screen 2. The upper and lower cleaning chambers are essential components of the apparatus for carrying out cleaning the solder paste residue adhered to inner peripheral surfaces of the openings 2C in the screen 2 as well as the solder paste residue adhered to the upper and lower surfaces 2A, 2B from the screen 2. A wash liquid supply means is provided for supplying wash liquid into each of the chambers 4, 5 to wash away the past residues adhered to the screen 2.

Abstract: The cistern body has an interior in which fittings are to be accommodated. At least one functional part of the inflow or outflow fitting is integrated in the wall of the cistern body. The functional part is preferably a pipe which forms an overflow channel, an inflow channel or an installation channel. The cistern body is preferably produced by blow molding.

Abstract: The screwed cable gland has at least one lower part, a pressing part, and a union nut, which are each traversed by a respective hole and are to be pushed over the cable. The lower part can be connected to a housing in an electrically conducting manner and can be axially tensioned with the union nut. The pressing part and the sealing insert form one unit, wherein the sealing insert is arranged in the union nut and reduces the cross section of its hole with increasing axial tension between the lower part and the union nut. The screwed cable gland is characterized by inexpensive manufacture and simple assembly.