Abstract: An improved filtration candle comprises at least one filtration candle, wherein each filtration candle comprises an elongated filtration sleeve including a threaded male neck on one distal end thereof, an elongated perforated casing including attachment members on one distal end adapted to removably attach to the one distal end of the filtration sleeve, and three supports located on an opposite distal end extending radially inward to a center axial point thereof, such that the perforated casing is adapted to slide over a substantial length of the filtration sleeve until an opposite distal end of the filtration sleeve makes contact with the three supports and the attachment members are attached to the one distal end of the filtration sleeve. An inspection cap removably attached to the opposite distal end of the perforated casing is adapted to be removed when inspection of the filtration sleeve is desired.

Abstract: A multi-floor building construction system for progressively constructing floors on load-bearing means of a foundation as the occupational need to do so arises and while sub-floors can be occupied. A permanent roof structure is displaceably supported over an uppermost floor of at least an upper one of one or more occupational floor spaces. Extensible load support means is secured in the roof structure until the completion of the mufti-floor building. The extensible load support means rests upon the uppermost floor to support the total load of the permanent roof structure. The extensible load support means is extendible downwardly to push against the uppermost floor to raise the permanent roof structure. Adjustable hoisting means is secured inside the permanent roof structure for lifting floor sub-assemblies fabricated in the construction zone using the extensible load support means while simultaneously raising the permanent roof structure.

Abstract: A multi-floor building construction system and method for progressively constructing floors on the building, as the occupational need to do so arises and while some floors can be occupied, is described. A permanent roof structure is displaceably supported over at least an occupational first floor space constructed on the foundation. Extensible load support elements are secured in the roof structure and adapted to rest upon the load-bearing means to support a total load of the permanent roof structure. The extensible load support means are operated in synchronization. Extensible occupants elevators service the occupational floor space. A wall enclosure is secured inside and about the permanent roof structure.

Abstract: A belt tensioner comprises a belt trained on a drive pulley driven by a drive unit mounted on a base supported on an air-spring bellows linearly extendable under fluid pressure from a collapsed position to an extended position to cause joint movement of the base, the drive unit and the drive pulley and thereby change the tension in the belt. A pressure regulator is operatively connected to the air-spring bellows for regulating the fluid pressure in the air-spring bellows such as to maintain the tension substantially constant in the belt during use.

Abstract: A belt tensioner comprises a belt trained on a drive pulley driven by a drive unit mounted on a base supported on an air-spring bellows linearly extendable under fluid pressure from a collapsed position to an extended position to cause joint movement of the base, the drive unit and the drive pulley and thereby change the tension in the belt. A pressure regulator is operatively connected to the air-spring bellows for regulating the fluid pressure in the air-spring bellows such as to maintain the tension substantially constant in the belt during use.

Abstract: A portable panel of partitioning a building space, which panel is aesthetic, practical in use and not very expensive to manufacture. This panel comprises two wall units both having the same surface area. The units are mounted end to end and externally covered with a single piece of cloth fixed to their internal periphery. The wall units are closed once against the other with the piece of cloth acting as a hinge, such closing advantageously dissimulating the fixation of the piece of cloth onto the wall units and thus avoiding the use of a decorative mask. The panel also comprises at least one passage provided in at least one of the wall units for operatively installing the panel in the building space in a removable manner. In addition, the portable panel may further comprise a sound insulating sheet provided on its both sides with a covering layer of not compressed material for improving the acoustic efficiency of the whole panel.