Abstract:
A metering head for delivering a liquified fuel gas in different combustion chamber sections of a tool and including an inlet ( 8 ), at least two outlets ( 16, 17 ), and at least one metering valve ( 5, 5   a   , 5   b ) connecting the inlet ( 8 ) with the at least two outlets ( 16, 17 ).

Description:
BRIEF DESCRIPTION OF THE DRAWINGS: 
     The drawings show: 
     FIG. 1 a cross-sectional view of a metering head according to the present invention with a metering valve and two outlets and with the head inlet connected with a gas bottle; 
     FIG. 2 a cross-sectional view of the metering head shown in FIG. 1 with the cross-section taken at an angle of 90° to the cross-section shown in FIG. 1; 
     FIG. 3 a cross-sectional view of a metering head according to the present invention with two metering valves arranged in a longitudinal direction of a gas bottle with which the metering head is connected, and two outlets; 
     FIG. 4 a cross-sectional view of a the metering head shown in FIG. 3 with the cross-section taken at an angle of 90° to the cross-section shown in FIG. 3; 
     FIG. 5 a cross-sectional view of a the metering head according to the present invention with two metering valves arranged transverse to a longitudinal direction of a gas bottle, with which the metering head is connected, and two outlets; 
     FIG. 6 a cross-sectional view of a the metering head shown in FIG. 5 with the cross-section taken at an angle of 90° to the cross-section shown in FIG. 5; 
     FIG. 7 a view showing the metering head as shown in FIG. 5 at an increased scale; 
     FIG. 8 a view showing the metering head as shown in FIG. 6 at an increased scale; and 
     FIG. 9 a partial cross-sectional view showing the region of inlet and outlet of the metering valve. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     In the embodiment of a metering head according to the present invention, which is shown in FIG. 1, the metering head  1  is fixedly secured on a gas bottle  2  containing liquified fuel gas. For securing of the metering head  1  on the bottle  2 , there are provided, in the lower region of the metering head  1 , resilient hooks  3  which extend downwardly from the lower portion of the metering head  1  and engage beneath a circumferential head  4  of the upper end side of the gas bottle  2 . 
     Inside of the metering head  1 , there is located a metering valve  5  a longitudinal axis  6  of which coincides with a longitudinal axis  7  of the gas bottle  2 . A ventilation chamber (not shown) of the metering valve  5  has its inlet side connected with hollow pin  8  which extend from a bottom  9  of the metering head  1 . When the metering head  1  is secured on the gas bottle  2 , the hollow pin  8  engages in the outlet valve of the gas bottle  2 , opening the valve. Liquified gas flows from the gas bottle  2  through the hollow pin  8  into a channel  10  of the metering valve  5 , reaching the metering chamber of the metering valve  5 . The metering chamber of the metering valve  5  is constantly filled through its inlet with the fuel gas when the metering head  1  is secured on the gas bottle  2  and is not actuated. The outlet of the metering chamber of the metering valve  5  remains closed and becomes open only when needed, with the inlet of the metering chamber being closed for a short time. 
     The outlet of the metering chamber of the metering valve  5  is connected with an annular channel  12  by an outlet channel  11  of the metering valve  5  and a connection channel  13 . Two transverse channels  14  and  15  open, respectively, into two spout-out nozzles  16  and  17 . 
     The annular channel  12 , the connection channel  13 , and the transverse channels  14  and  15  are all located in a cap portion  18  of the metering head  1 . The lower region of the cap portion  18  circumscribes the metering head chamber containing the metering valve  5  and the bottom member  19  of the metering head  1  which carries the metering valve  5 . The bottom member  19  is displaceable along the longitudinal axis  6  of the metering valve  5 . The hooks  3  and the hollow pin  8 , which were discussed above, are provided on the bottom member  19  and, e.g., are formed integrally therewith. 
     The outlet channel  11  of the metering valve  5  extends along the metering valve axis  6  and is dischargeable in a correspondingly extending portion of the connection channel  13 . When the gas bottle  2  is lifted and the bottom member  19  is pushed into the cap portion  18 , an outer flange  20  of the metering valve  5  is lifted, which results in the inlet valve of the metering valve  5  being closed and the outlet valve of the metering valve  5  being open, with a metered volume of the liquefied fuel gas reaching the spout-out nozzles  16 ,  17 . The spout out. nozzles  16 ,  17  are located in cylindrical members  21 ,  22  connected with the cap portion  18 . The cylindrical members  21 ,  22  are provided with outer sealing rings  23 ,  24 , respectively, and therewith are sealingly inserted in corresponding openings formed in the wall of a combustion chamber of a setting tool. The cap portion  18  is fixedly connected to this wall. The longitudinal axes  25 ,  26  of the spout-out nozzles  16 ,  17 , which form outlets of the metering head  1 , extend transverse to the longitudinal axis  6  of the metering valve  5 . Upon lowering of the gas bottle  2 , the bottom member  19  which is fixedly connected with the gas bottle  2  as described above, also moves downwardly. The downward movement of the bottom member  19  results in closing of the outlet of the metering chamber  5  and opening of its inlet, and the metering chamber of the metering valve  5  is again filled with the liquified fuel gas. 
     FIGS. 3-4 show a second embodiment of the metering head according to the present invention. In FIGS. 3-4, the elements of the metering head  1  identical with those shown in FIGS. 1-2, are designated with the same reference numerals and will not be further described. 
     The embodiment of the metering head  1  shown in FIGS. 3-4 differs from that shown in FIGS. 1-2 in that the metering head  1  has two metering valves  5   a  and  5   b  the longitudinal axes  6   a  and  6   b  of which are spaced from each other and extend parallel to the longitudinal axis  7  of the gas bottle  2 . The metering head  1  is fixedly secured on the gas bottle  2 , and the bottom member  19  is not displaceable relative to the cap portion  18 . The metering chambers  27   a ,  27   b  of the two metering valves  5   a ,  5   b  are thereby permanently and simultaneously filled with the liquified fuel gas through the hollow pin and the channel  10  provided in the bottom number  19 . The inlets  30   a ,  30   b  of the metering chambers  27   a ,  27   b  of the valves  5   a ,  5   b  remain open, as it, particularly can be seen in FIG.  3 . 
     Outlets  28   a  and  28   b  of the metering chambers  27   a ,  27   b  of the metering valves  5   a ,  5   b  are still closed in the position shown in FIG.  3 . The outlets  28   a  and  28   b  are connected, respectively, via the connection channels  11   a ,  11   b , with transverse channels  29   a ,  29   b  which, in turn, open into nozzles  16 ,  17 , respectively. The connection channels  11   a ,  11   b  are connected with the transverse channels  29   a ,  29   b  at the edges of the transverse channels  29   a ,  29   b . When with the stationary cap member  18 , the gas bottle  2  is pushed in the direction toward the cap member  19 , the bottom member  19  is displaced partially thereinto. This results in closing of the inlets  30   a ,  30   b  of the metering chambers  27   a ,  27   b  and in opening of the outlets,  28   a ,  28   b . This provides for the flow of the liquified fuel gas toward the nozzles  16 ,  17 . Upon release of the gas bottle  2 , the bottom member  19  moves out of the cap member  18  which results in closing of the outlets  28   a ,  28   b  of the metering chambers  27   a ,  27   b  and in opening of the respective inlets  30   a ,  30   b . With this process, the members  21 ,  22 , in which the nozzles  16 ,  17  are located, are fixedly secured in the wall of the combustion chamber of the setting tool, whereby the cap member  18  is fixedly positioned. 
     The structure of the metering valve itself will be discussed in more detail below with reference to FIG.  9 . 
     A third embodiment of a metering head  1  according the present invention is shown in FIGS. 5-8. In this embodiment, the metering valves  5   a ,  5   b  are so arranged that their longitudinal axes  6   a ,  6   b  extend transverse to the longitudinal axis  7  of the gas bottle  2 . In FIGS. 5-8, the elements of the metering head  1  identical with those of FIGS. 1-4 are again designated with the same reference numerals and will not be discussed in detail. 
     In the embodiment shown in FIGS. 5-8, the metering chambers  27   a ,  27   b  of the metering valves  5   a ,  5   b  are connected, as in the previous embodiments, with the hollow pin  8  via the channel  10 . The metering chambers  27   a ,  27   b  become filled with the liquified fuel gas when the outlet  28   a ,  28   b  are not in communication with the metering chambers  27   a ,  27   b  and are quali closed. In this case, no fuel gas flows to the nozzles  16 ,  17 . The outlet channels  11   a ,  11   b , which are connected with outlets  28   a ,  28   c , at their rear end, open into a front plate  18   a  of the cap member  18 , with the channels  11   a ,  11   b  being sealed relative to the plate  18 . 
     The outlet channels  11   a ,  11   b  are connected with the nozzles  16  and  17 . The cylindrical members  21 ,  22 , which house the nozzles  16 ,  17 , respectively, are formed integrally with the front plate  18   a  and have inner channels  16   a ,  17   a  which lead from the nozzles  16 ,  17  to the outlets channels  11   a ,  11   b . The connections between the front plate  18   a  and the outlet channels  11   a ,  11   b  are fluid-tight, at least in the edge region of the outlet channels  11   a ,  11   b . The front plate  18   a  extends transverse to the longitudinal axes  6   a ,  6   b  of the metering valves  6   a ,  6   b , with the cylindrical members  21 ,  22  being inserted in respective openings in the combustion chamber wall. The bottom member  19  is fixed to the gas bottle  2  and is displaceable toward the front plate  18   a  in accordance with the operational cycle of the setting tool the combustion chamber of which has to be filled with the fuel gas through the nozzles  16 ,  17 . The operation of the drive mechanism of the bottom member  19  along the axes  6   a ,  6   b  or  25 ,  26  can be controlled by the control unit of the setting tool. 
     With the bottom member  19  remaining stationary, i.e., in position in which it is not pushed toward the front plate  18 , the liquified fuel gas flows from the gas bottle  2  into the metering chambers  27   a ,  27   b  via the hole pin  8  and the channel  10 . The inlets  30   a ,  30   b  are open, as can be seen in FIG.  8 . The outlets  28   a ,  28   b  are located outside of the respective metering chambers  27   a ,  27   b  and are closed. Springs  31   a ,  31   c , which are supported against the bottom member  19 , bias the valve tappets  32   a ,  32   b  permanently into a position in which the inlets  30   a ,  30   b  remain open. On the other hand, the outlet channels  11   a ,  11   b , which sit on the valve tappets  32   a ,  32   b , are supported against the front plate  18   a . When the bottom member  19  is pushed toward the front plate  18   a , the measuring chamber housings  33   a ,  33   b , which are connected with the bottom member  19 , are displaced therewith and close respective inlets  30   a ,  30   b . The housings  33   a ,  33   b  are displaced past the outlets  28   a ,  28  so the later are located inside the respective metering chambers  28   a ,  28   b . The fuel gas, which fills the metering chambers  27   a ,  27   b , flows therefrom via the outlets  28   a ,  28   b  and the outlet channels  11   a ,  11   b  to the nozzles  16 ,  17 . Upon release of the bottom member  19 , the measuring chamber housings  33   a ,  33   b  move downward, closing the outlets  28   a ,  28   b . The springs  31   a ,  31   b  retain the valve tappets  32   a ,  32   b  in a position in which the inlets  30   a ,  30   b  remain open. 
     FIG. 9 shows an axial cross-sectional view of the metering valve. The valve tappet  32   a  carries a cylinder  37  provided with the outlet channel  11   a  and the transverse channel defining the outlet  28   a . The housing  33   a  define the metering chamber  27   a  and is provided with a resilient sealing  34  in which the valve tappet  32   a  is received. A flange  20   a  holds the housing  33   a  in engagement with the bottom member  19 . The free end of the outlet channel  11   a  is in contact with the front plate  18   a  of the cap member  18 . The cylinder  37 , in which the outlet channel  11   a  is formed, is biased against the front plate  18   a  by the spring  31   a  supported against the bottom member  19  and acting on the valve tappet  32   a.    
     FIG. 9 shows a position of the metering chamber housing  33   a  relative to the outlet channel  11   a , in which the transverse outlet channel  28   a  is located inside of the metering chamber  27   a . In this position, the outlet  28   a  is open so that the fuel gas, which fills the metering chamber  27   a , can flow through the channels  28   a  and  11   a . Upon release of the bottom member  19 , the flange  20   a  is pulled relative to the valve tappet  32   a  or the outlet channel  11   a  rearwardly, with the flange  20   a  being pulled, with respect to the transverse channel  28   a , leftwards until it is located behind the outlet  28   a  (the transverse channel). Thereby the outlet  28   a  becomes closed. Simultaneously or shortly thereafter, the resilient sealing  34  of the metering chamber housing  33   a  is displaced over the chambered rear edge  35  of the cylinder  37 , whereby a clearance is formed between the edge  35  and the resilient sealing  34  through which the fuel gas can flow into the chamber  27   a  through the inlet  30   a  which is defined by the formed clearance. The downward movement of the flange  20   a  is limited by a stop  36  provided on an outerside of the cylinder  37 . 
     Though the present invitation was shown and described with references to the preferred embodiments, such are merely illustrative of the present invention and are not to be construed as a limitation thereof and various modifications of the present invention will be apparent to those skilled in the art. It is therefore not intended that the present invention be limited to the disclosed embodiments or details thereof, and the present invention includes all variations and/or alternative embodiments within the spirit and scope of the present invention as defined by the appended claims.