Static structures (e.g. – buildings) – With lifting or handling means for primary component or... – Position adjusting means; e.g. – leveling
Patent
1987-02-19
1988-03-29
Murtagh, John E.
Static structures (e.g., buildings)
With lifting or handling means for primary component or...
Position adjusting means; e.g., leveling
522381, 52280, 52283, 52483, F04B 558
Patent
active
047335092
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to the installation of ceilings, floors and partition walls in a movable partition system, and more particularly to a movable partition system for clean rooms which allows the volume of a room to be changed and which provides for improved utilization of the space above a ceiling.
2. Background Art
To date, clean rooms which are utilized in hospitals or factories, have had a form of construction in which a partitioned room is bounded by a ceiling, a floor and partition walls having no irregularity or gaps in order to prevent bacteria or dust from clinging thereto and to facilitate the cleaning of the inner surfaces of the room. The prior art has effected certain problems and there has been a demand for improvement in several aspects, as described below.
The ceiling of this type of clean room has a uniformly flat ceiling surface (that is, the lower surface of the ceiling; hereinafter referred to with this meaning) which is constituted by ceiling panels having smooth surfaces which are disposed close to each other without any gap between adjacent panels, thereby covering the entire area of the ceiling. However, these panels are secured by nails, screws or frames, so that the ability to maintain the cleanliness is apparently reduced due to corrosion of th heads of screws and the like or the irregularities formed by the same. On the other hand, on the reverse surface of the ceiling (that is, the upper surface of the ceiling; hereinafter referred to with this meaning), the ceiling panels are fixed to stiffeners which are secured to hanger bolts suspended from beams or the like, thus being in a so-called suspended state. It is considered to be dangerous for a person to step on these ceiling panels (to allow his body weight to bear on them). At the same time, there is often a need for work associated with the installation of certain equipment to be facilitated, for instance, wiring and piping for a newly installed machine, and there are certain types of equipment which are more suitably installed on the reverse surface of the ceiling than in the room. Therefore, a type of ceiling panel is needed which is capable of bearing the weight of workers, machines and equipment, and of withstanding the vibrations caused during installation work while workers are working on the ceiling in an ordinary manner rather than walking with extremely care.
It is also required that a strong ceiling panel device, which might satisfy these requirements, is able to provide a sufficient space for work of the above-described kinds to be carried out. A system in which hanger bolts are disposed at small intervals is unsatisfactory in this regard. Furthermore, it is preferable to adopt a type of hanger bolt which can be moved both vertically and horizontally in position, since even when they are few in number it is important that they are not positioned in places where equipment may be installed or workers will be working.
It goes without saying that it is primarily necessary in a clean room system to maintain cleanliness: specifically it must be air-tight, free from any risk of contamination, and capable of being cleaned easily and perfectly.
A ceiling panel in a movable partition system which satisfies these requirements is extremely heavy and the size of this type of panel in the form generally employed is large (e.g., 1000 mm.times.2000 mm). As an ideal solution, therefore, there has been a demand for improvements in the stability of this type of panel when mounted, as well as in the degree of safety and ease with which the installation work may be carried out.
It is common to stress the need for good lighting systems in clean rooms, but the cleanliness of the ceiling surface has always been regarded as a primary factor, and the installation of lighting fixtures tends to be a secondary concern, often resulting in the formation of undesirable projections on the ceiling.
A further requirement is to allow for rearrangement of the space within a clean room by installing partition walls in
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Comany Co., Ltd.
Murtagh John E.
Rudy Andrew Joseph
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