Abstract:
Safety cabinet for filling self-contained breathing apparatus bottles comprising a housing body with high-strength walls, openable on its front and top sides and forming a work surface fitted with a plurality of tapered rubber rollers, linked at their narrow ends and arranged to form a bed of supporting rollers for the bottles to be filled, arranged horizontally and to which the respective filling taps are attached. The housing body is closed using a vertical front door and a horizontal top door.

Description:
[0001]    This application is a 371 of PCT/ES2008/000423 filed Jun. 11, 2008, which application is incorporated by reference. 
     
    
     OBJECT OF THE INVENTION 
       [0002]    This invention is in reference to a safety cabinet for filling self-contained breathing apparatus bottles. 
       FIELD OF THE INVENTION 
       [0003]    This is the field of conditioning (filling) of bottles of compressed air or other gases used in the self-contained apparatus used in underwater activities and in special work on the surface. 
       BACKGROUND OF THE INVENTION 
       [0004]    For the filling of compressed air bottles, installations equipped with safety resources, especially passive, are known, of great resistance and sturdiness, designed for the prevention of accidents resulting from possible leaks of said fluid and of breakage of the recipients themselves and which, due to their characteristics, are commonly known as bunkers. The construction and maintenance of said installations is, obviously, very elevated. 
         [0005]    On the market there is a type of cabinet for the filling of bottles in which the bottles are inserted in vertical position and must be adjusted carefully in their orientation so that the filling can be done correctly. Normally, the cabinet in question accepts one type or size of bottle for filling (except in the case of readaptation), preferably, and this is not possible for paired bottles in what is known in the specialty as “twin bottles”. Moreover, given the configuration of the installation, the operators of the cabinet in question are forced to adopt uncomfortable and tiring postures in their work. 
         [0006]    There is, therefore, a need to dispose of a cabinet for the filling of compressed air bottles which eliminates the disadvantages mentioned. 
       BRIEF DESCRIPTION OF THE INVENTION 
       [0007]    Bearing in mind the disadvantageous aspects of the previously known types of filling machines, which have been stated above, a cabinet has been designed which is easy to use with all types of bottles and for different values of filling air pressure. Characteristically, the bottles are inserted into the machine in horizontal position, which facilitates their handling and positioning for the filling phase. 
         [0008]    The structure of the new cabinet is very sturdy, explosion proof, and the operators have effective bodily protection, thus complying with the law on job risk prevention. 
         [0009]    To facilitate the explanation, this description is accompanied with drawings showing, for illustrative and non-limiting purposes, a case of realization of a safety cabinet for the filling of air bottles used in self-contained breathing apparatus according to the principles of the claims. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0010]      FIG. 1  shows a new safety cabinet in a closed state. 
           [0011]      FIG. 2  shows the cabinet in an open state, prepared for use. 
           [0012]      FIGS. 3 and 3  bis represent the internal configuration of the new safety cabinet for the filling of two pairs of bottles ( 16 ), ( 17 ), which in the example are, respectively, twin bottles and a pair of separate bottles, simultaneously or not. 
           [0013]      FIG. 4  shows the new cabinet with its front door ( 2 ) open and the filling tap ( 30 ) at rest. 
           [0014]      FIG. 5  shows the new cabinet with the front door ( 2 ) closed and the filling tap ( 30 ) in operation. 
           [0015]      FIGS. 6 and 7  show the new cabinet adapted for the filling, in each operation, of two bottles ( 16 ), ( 17 ): in said examples, twin bottles ( FIG. 6 ) and a pair of separate bottles of greater size ( FIG. 7 ), respectively. 
           [0016]      FIG. 8  is a detail in perspective of the unit of rollers for support of the bottles ( 16 ), ( 17 ) for filling them in horizontal position. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0017]    The elements designated with numbers in the drawings correspond to the parts indicated as follows. 
         [0018]    The cabinet described consists of a box-shaped body ( 1 ) in general orthoedric shape, with walls made of a material of great resistance (in order to support, in case of the explosion of one or more bottles of compressed air, the stresses resulting from this incident). 
         [0019]    Body ( 1 ) opens on its front vertical face and on its upper base, by which its utilization is verified and where the two doors ( 2 ), ( 3 ) for access to the interior are located. 
         [0020]    Door ( 2 ) moves vertically on the plane of the front face, and is operated by a mechanism for its elevation and descent, which will be described. 
         [0021]    Door ( 3 ) moves horizontally on the upper base of the body  1 , sliding with rollers ( 3   a ) on two lateral guides, and equipped with two handles ( 4 ) for manual movement. 
         [0022]    The movement of door ( 3 ), apart from the manual method indicated, can likewise be carried out with an electromechanical device that is known, such as with a nut ( 39 ), a lead screw and an electric motor ( 40 ). The door can also be folding or other type. 
         [0023]    The operating mechanism of the front door ( 2 ) includes an electric motor ( 5 ), actuator of a transversal axle-shaft ( 6 ), the ends of which, sustained by bearings ( 7 ), carry the conical cog wheels ( 8 ), meshed with other wheels ( 9 ) attached to the lateral and vertical spindles ( 10 ). 
         [0024]    The spindles ( 10 ), in their turning, determine the vertical movement of the nuts ( 11 ), attached to the supports ( 12 ) fixed to the front door ( 2 ) and which will produce the vertical movement of the same. 
         [0025]    Conventionally, the heads of the spindles ( 10 ) rest with bearings ( 13 ) on the supports ( 14 ) on the upper and lateral parts of the body ( 1 ). 
         [0026]    The vertical movement of the front door ( 2 ) could likewise be carried out with pneumatic or hydraulic cylinders, chain and/or belt mechanisms and similar. 
         [0027]    The grease pump ( 15 ), located on one of the exterior sides of the body ( 1 ), serves for maintenance of the device, especially of the spindles ( 10 ). 
         [0028]    Bottles ( 16 ), ( 17 ) which are to be filled with compressed air are inserted in horizontal position into the cabinet. Initially, they are allowed to rest on a transversal roller ( 41 ), located on the upper edge of the front door ( 2 ) and are then deposited by horizontal pushing, according to  FIGS. 3 to 8 , on sets of rollers ( 18 ), ( 19 ) of rubber or similar material, of low hardness and conical shape, associated two by two at their smaller bases (defining shapes of the known “diavolo”). This characteristic ensures the stability and virtual immobility of the bottles ( 16 ), ( 17 ) during the filling operation; it likewise ensures that no scratching occurs or other aggressions on the outer surface of the bottles ( 16 ), ( 17 ). 
         [0029]    Rollers ( 18 ), ( 19 ) are mounted on fixed horizontal shafts ( 20 ), parallel and equidistant, sustained by the side faces ( 21 ), ( 22 ) of a common support ( 23 ) in a low box shape. Inside of it there is a partition ( 24 ) parallel to the faces ( 21 ), ( 22 ); thus, there is a section in E shape, which is passed through by the shafts ( 20 ). 
         [0030]    One part ( 18 ) of the rollers can turn freely on the shaft sections ( 20 ) (fixed) located between the face ( 21 ) and the partition ( 24 ), and cannot move axially. 
         [0031]    Another part ( 19 ) of the rollers is first contained inside of a support ( 27 ) in the shape of a channel of rectangular section, the side faces of which, provided with perforations ( 28 ), are passed through by the same fixed shafts ( 20 ). 
         [0032]    The space defined between the partition ( 24 ) and the face ( 22 ) of the support ( 23 ) is greater in width than the distance between the face ( 21 ) and the partition ( 24 ) itself; thus, the length of the shaft sections ( 20 ) in this space is greater than that of each conical roller pair ( 19 ) and their support ( 27 ). 
         [0033]    For this reason, support ( 27 ) can move, always parallel to itself, leaving exposed equivalent sections of the shafts ( 20 ). Consequently, the distances between the roller pairs ( 18 ), ( 19 ) mounted on the shafts ( 20 ) can be modified at will, according to the diameters of the bottles ( 16 ), ( 17 ) placed horizontally on them. 
         [0034]    Alternatively, instead of the elastic rollers ( 18 ), ( 19 ) mentioned, forming a unit of support for the bottles ( 16 ), ( 17 ) oriented horizontally, a shelf or drawer could be used, sliding horizontally on guides and forming “beds” or elongated entries for receiving and sustaining the bottles ( 16 ), ( 17 ). 
         [0035]    The bottles ( 16 ), ( 17 ) remain with their taps ( 29 ) located on the front, upper and inner part of the body ( 1 ) of the cabinet ( FIG. 4 ), and for their filling, receive the coupling of the filling taps ( 30 ) ( FIG. 5 ), disposed in number of four, according to  FIGS. 3 and 3   bis , or of two, according to  FIGS. 6 and 7 . 
         [0036]    The filling taps ( 30 ) ( FIGS. 4 and 5 ) are fed through respective flexible tubular hoses (conduits) ( 31 ), associated to an air collector ( 32 ) to which, in turn, the air intake ( 25 ) is connected, pertaining to the installation of an air compressor not shown in the drawings. Conventionally, suitable purgers will be used. 
         [0037]    The new cabinet has a control panel ( 26 ) which includes an emergency switch ( 33 ) ( FIG. 7 ), a filling gauge ( 34 ), a compressor filling switch ( 35 ), a stop switch ( 36 ), and switches ( 37 ), ( 38 ) for the vertical movement of the front door ( 2 ) and the horizontal movement of the upper door ( 3 ) simultaneously. The control panel ( 26 ) mainly occupies an upper part of the body ( 1 ). 
         [0038]    The passive safety of the described cabinet with respect to occasional explosions due to the release of air at high pressure and breakage of bottles ( 16 ), ( 17 ) is guaranteed by the sturdiness of the walls of the body ( 1 ) and of the doors ( 2 ), ( 3 ), made mainly of iron plate of a suitable thickness. The objective is the personal safety of the users of the filling cabinet. 
         [0039]    On the inner, lower and rear parts of the body ( 1 ) ( FIGS. 4 and 5 ) there is a tube or camera ( 42 ) ( FIG. 5 ) with escape openings for the shock wave which would be produced in the case of explosion or breakage of one or more high-pressure air bottles ( 16 ), ( 17 ). 
         [0040]    To be included among the advantages of the filling cabinet described are, in addition to its safety and ease of use, its portability and the possibility of simultaneously filling bottles ( 16 ), ( 17 ) of different types and at different values of air pressure. It is not necessary to lift and maintain an upper door which may injure the user of the cabinet if it falls, or use pins or other auxiliary elements to position said upper door, as is the case with other types of cabinets for filling bottles. 
         [0041]    All that does not affect, alter, change or modify the essence of the cabinet described will be variable by the holder of this patent, for the purposes of the protection provided by the same. Modifications may not be introduced by other persons with the purpose of eluding the protection of this patent, without authorization of the holder.