Abstract: A pipe jointing unit includes a cylindrical joint in which is accommodated a pipe, a ring-shaped seal member positioned in the joint, an elastic connecting member positioned in the joint and holding the pipe and the ring-shaped seal member in the joint, and a guide member detachably connected to the joint. The guide has an annular guide portion which is disposed circumferentially between the inner surface of the edge portion of the joint and the outer surface of the pipe. The pipe is thus restricted from swinging in the radial direction relatively against the joint and the reliability of the resistance force against pulling the pipe out of the connecting member by vehicle vibration, an increase of the internal pressure of the pipe and the like is improved.

Abstract: A laminating blow molding method for making a hollow article includes steps of: laminating a resin sheet on an outer surface of a parison extruded from a path between a die head and a core; sandwiching the parison with the resin sheet between a pair of mold pieces constituting a mold while heating the mold to a temperature exceeding softening temperatures of the resin sheet and the parison, one of the mold pieces having shifting members at side portions thereof; closing the mold so that the parison with the resin sheet is held inside the mold, and moving the shifting members to the other of the mold pieces so that overhangs at both ends of the parison and resin sheet are pressed rearwardly to shift rearwardly burrs which are pressed out from the mold; and blowing the parison to perform blow molding. Thereafter, the mold is cooled and the molded article is taken out. In the method, a front side of the molded article is formed smoothly.

Abstract: A vehicle height control system including a shock absorber having an air chamber, an air compressor connected with the shock absorber through an air supply conduit, an air drain conduit connected the air supply conduit, an air drain valve in the air drain conduit and which is opened so as to discharge to the atmosphere, air stored in the air chamber and the air supply conduit, a cut-off valve disposed between the shock absorber and the air compressor in the supply conduit and which is closed so as to store the air in the air chamber, and a controller which controls an operation of the air compressor, the air drain valve and the cut-off valve so as to control the amount of air stored in the air chamber, wherein the air drain valve remains opened for a predetermined time during which operation of the air compressor is started and the cut-off vale is opened after the air compressor is started.

Abstract: An improved process and apparatus for blow molding of engineering plastic materials, using a mold and an extrusion machine with a die for producing a hollow plastic parison to be partially received in the mold. An extrusion operation and a preblowing operation with air from the die into the parison are concurrently commenced at a high extrusion speed and a low air pressure, with a material remaining in the die being integrated with an upstream portion of a preceding parison prepared in a preceding blow molding run, to complete the downstream parison. The upstream portion has a closed and free lower end prepared in the preceding run. The apparatus is provided with a pinching and cutting device for self-adhering and separating the completed parison above and in the vicinity of the mold to prepare the above mentioned closed free end.

Abstract: A blow molding die includes a housing, and a mandrel with a core integrated therewith, combined to form a vertically extending annular melt passage communicating with a hole formed at its top portion for feeding a plasticized resin melt from an extruder, and terminating at die lips formed at its free bottom end. The mandrel has a pair or grooves symmetrical relative to its axis, formed at its peripheral surface so as to have hanger type profiles in its front developed view, and connecting to each other at lower ends thereof. The feed hole opens to the symmetrical hanger type grooves at top and central points thereof. Each groove has an arced surface and a cross-sectional area decreasing in a direction from the top and central point to the lower end.

Abstract: An improved injection blow molding machine has an melt accumulator or melt metering chamber and a vertically extending oval type die communicating therewith for injecting an elliptical annular parison through the die, which is to be blow molded to produce a hollow double wall type article. The oval type die includes a die housing and a mandrel mounted therein to define a melt passage therebetween having a die lip or opening of a four sided elliptical annular profile at a free lower end of the die. The accumulator is in direct contact with the mandrel, and/or the die housing is enlarged in a horizontal direction at a lower end portion thereof. Preferably the enlarged lower end portion is formed by a plate part fixed to a block part forming an upper portion of the die housing.

Abstract: A blow molding process of producing molded articles including the steps of extruding a parison of the plasticized material from a die into a gap between mold halves while the mold is open and blowing gas into the parison, while the mold is closed, to have the parison form a molded hollow article within the mold. The parison is heated before molding by heating the inner shell contoured parts of the mold at the surfaces thereof and the plasticized material at the outer surface by using an instantaneous radiation heater disposed in the mold half gap to partially encompass the parison while the mold is open and the inner shell contoured part is heated by a heating medium passed through the heat medium passages. The molded article is cooled by cooling the mold at the inner shell contoured parts thereof by flowing a cooling medium through the heat medium passages of the mold while the mold is closed. The cooling of the mold occurs alternately with the heating of the mold by the heating medium.

Abstract: A cleaning machine includes a frame having wheels, a suction blower having an air inlet and an air outlet and mounted on the frame, an intake opening communicating with the air inlet of the suction blower for sucking dirt containing relatively large dirt such as fallen leaves and relatively small dirt such as dust together with air by the sucking force generated by the suction blower, a dirt separator communicating with the air outlet of the suction blower by means of a duct for separating the dirt from the air blown out from the suction blower, and a dirt receptable for collecting the relatively large dirt separated by the dirt separator, and the dirt receptacle detachably attached under the main separator.

Abstract: A cleaning machine includes a frame having wheels, a suction blower having an inlet and an outlet mounted on the frame, an intake opening communicated with the inlet of the suction blower for sucking dirt containing relatively large dirt such as fallen leaves and relatively small dirt such as dust together with air, a main separator for separating the relatively large dirt, a subseparator for separating the relatively small dirt from the air having passed through the main separator, and a dirt receptacle made of an air-impermable material detachably attached under the main separator through a pivoting rod which is pivotably mounted to the frame so as to support the receptacle to the main separator and a clamp member for securing the dirt receptacle to the main separator.

Abstract: An apparatus for blow-molding a hollow double wall type article using a mold incorporated with a heating and cooling system. The mold consists of male and female mold halves, each composed of an outer shell area having a contoured cavity surface part and an inner heat insulating area defined within the outer shell area. The cavity surface part is made of mainly of a metallic material having a high thermal conductivity, and the inner heat insulating area is provided therein with a reinforcing block for reinforcing the outer shell area against a blow molding pressure and a mold clamping pressure. The inner heat insulating area provides a substantial thermal insulation against a transmission of heat thereto from the cavity surface part. The reinforcing block may be formed of a non-metallic material having a low thermal conductivity. Preferably, the block is permeably porous so that it provides heat medium passages for the heating and cooling system.