Abstract: A drilling tool for use in boring holes is formed of an axially elongated drilling member and a holder or input unit. The input unit laterally encloses the rearward end of the drilling member and is formed of at least two materials, one having a higher thermal conductivity than the other. The higher thermal conductivity material is in contact with the shank of the drilling member and extends radially outwardly to the outer surface of the input unit. The higher thermal conductivity material can have various shapes, for instance, that of a coil, spaced disks, a sleeve with inwardly extending webs or an inner sleeve and an outer sleeve spaced apart and joined by a flange-like web. The second material may be a plastic and can be fixed into holes or openings formed in the first material.

Abstract: A drilling tool for use in the tool holder of a drilling machine includes a drilling member and a holder input unit laterally enclosing the end of the drilling member which fits into the tool holder. The holder input unit is hollow and is non-rotatably connected to the drilling member. The input unit consist of an outer sleeve having a large radially outer surface spaced outwardly from the drilling member and webs extending between the drilling member and the sleeve. The outer surface of the sleeve is generally polygonal in cross section transverse to the axis of the drilling member and is shaped to fit into and contact the tool holder. The webs and sleeve of the holder input unit effect the transmission of heat from the drilling member.

Abstract: A drilling tool consists of a drill and a tubular shaped receiving part fitted onto the trailing end of the drill. The outer surface of the receiving part is shaped to fit into the chuck or retainer of a drilling device which rotates the drill. The inner surface of the receiving part and the juxtaposed surface on the trailing end of the drill are in locking engagement, however, under certain torque conditions the locking engagement will be released so that the receiving part can rotate relative to the drill. Preferably, the locking engagement is established by deflectable projections formed on at least one of the receiving part and the drill which seat into recesses formed on the juxtaposed surface of the other. Passageways are provided between the trailing end of the drill and the receiving part.

Abstract: In a copying machine a toner-image-bearing copy carrier moves in a predetermined direction along a predetermined path. A fixing arrangement fixes toner images by fusing the toner thereof. The fixing arrangement includes a heating winding having a plurality of turns and a holding arrangement for holding the heating winding. The holding arrangement comprises a plurality of discrete holding units each engaging and holding at least one respective one of the turns of the winding. The discrete holding units are arranged in two spaced groups. The turns of the heating winding extend in a plurality of stretches from one group of holding units to the other in the direction of the transport path and serve to heat the toner on copy carriers passing therealong.

Abstract: The copier includes a fixing arrangement for the heat-treatment of copying material by means of a heating device, and a blower operative for keeping the heat of the fixing arrangement away from heat-sensitive components of the copier, particularly the copying drum, by establishing a flow of cooling air travelling along a first predetermined flow path. The safety arrangement includes a diverting device activatable for diverting at least part of the flow of cooling air established by the blower away from the first flow path and into a second flow path leading through the interior of the fixing arrangement to effect cooling of the interior of the fixing arrangement. A detecting device detects copier malfunction. A control unit connected to the diverting device and to the detecting device is operative in response to detection of copier malfunction for activating the diverting device, to prevent copying material in the fixing arrangement from becoming damaged or ignited due to overheating.