Ventilation – Workstation ventilator – Movable
Reexamination Certificate
1999-11-23
2001-12-25
Joyce, Harold (Department: 3749)
Ventilation
Workstation ventilator
Movable
C219S137410, C454S049000
Reexamination Certificate
active
06332837
ABSTRACT:
The present invention relates to an arrangement for removing gas, smoke, solid particles, such as sparks and the like, in connection with welding and/or cutting burning.
On conducting different types of welding work gases and smoke are formed which are harmful to the person who performs the working operation Particularly on the welding of dissimilar metal alloys gases will be formed which are dangerous to the health. In addition gases and smoke which are formed will reduce visibility in the welding area.
On cutting metal various types of cutting machines and cutting burners are used. Also in these working processes gases and smoke are formed which are harmful, in addition to there being formed large quantities of sparks, which are small, very warm particles. Microparticles are also Formed which are too small to be seen, and these are transported by air currents into the body of the worker where they cause great harm.
It is therefore necessary to remove these gases and particles in an effective manner. Various methods have been tested. For example the general circulation in the building can be increased. However this creates other problems, such as noise, drafts and high energy consumption.
Another solution is to use point suction which is mounted above the welding/cutting point and which has as an object to suck in the gases/particles which are formed. However the problem is not solved satisfactorily since the gases/particles are sucked from the working area and upwards to the point auction, that is to say past the person who performs the work.
NO-63259 describes a work table which is used in welding work and the like, where the board per se is equipped with openings, and where the gases are sucked downwards through the openings by a suction flow which is arranged on the under side of the board.
NO-143:35 describes a broken through work board for cutting operations where there is arranged beneath the board a suction arrangement. Furthermore the suction box is provided with means for the reduction of the speed of jets/sparks, and means for cooling.
The solutions referred to are both designed for permanent mounting in for example plant halls. Both of the solutions are large and complicated constructions, and cannot be easily moved from one working location to another.
The present invention aims therefore to reduce or solve the afore-mentioned problems which are connected with welding/cutting. More specifically, this involves producing an effective system for removing gases/particles, together with a system for the reduction of the speed of sparks, and the cooling of these, and furthermore that the system is constructed with a low net weight and small dimensions, so that the arrangement is mobile and can be moved in a simple manner from one working location to another.
An embodiment of the present invention is characterised by the arrangement comprising in the main two parts, which can be easily latched together, namely an outer housing and an inner part, wherein the outer housing comprises means for drawing off air-borne pollutants, together with means for cooling both the outer housing and the inner part, and where the inner part is adapted to reduce the energy of the spark particles which are formed. Another embodiment is characterised by the arrangement being detachably fastened to the material which is to be welded/cut, and that the welding/cutting takes place within said arrangement, the arrangement being provided with openings, for conducting through equipment for welding and cutting, together with transparent sheets which are positioned in the arrangement so that the working operation can be controlled/performed from the outside of the arrangement.
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V. Reidar
Wilk Vidar
Carella Byrne et al.
Hand Francis G.
Joyce Harold
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