Patent Publication Number: US-4148198-A

Title: Refrigeration charging and sealing device

Description:
I have invented a new and novel refrigeration charging and sealing device. My device will reduce the need for a large variety of fittings for filling and charging refrigeration devices. My device will permit the use of one unit to service a large plurality of refrigeration units with a minimal consumption of materials. 
    
    
     My invention can be understood in view of the accompanying figures. 
     FIG. 1 is a perspective view of part of my device prepared for charging a refrigeration unit. 
     FIG. 2 is a top view of a swage block for use in conjunction with the components of FIG. 1. 
     FIG. 3 is a side view in partial section of the swage block of FIG. 2 with the swaging tool about to be inserted in the swage block. 
     FIG. 4 is the section of the swage block of FIG. 2 taken in the plane 4--4. 
    
    
     With regard to FIG. 1, a refrigeration unit 10 having a process tube 12 extending from the compressor 14 can have the compressor 14 charged with refrigerating fluid by inserting in the distal opening 16 of the process tube 12 a long capillary tube 18 of approximately 0.125 inch outside diameter and silver brazing the end of the capillary tube 18 to the process tube 12. The capillary tube 18 can be of long length with a Schraeder fitting 20 at the distal end of the capillary tube 18 for connection to the charging device. 
     After charging the refrigeration unit 10 the long capillary tube 18 is no longer needed but the process tube must be sealed and therefore the proximal end of the capillary tube 18 can be severed from the length of the capillary tube 18, thereby retaining a long length of capillary tube connected to a standard Schraeder fitting 20 which can then be reused for recharging many other refrigeration units such as 10. 
     With regard to FIGS. 2, 3, and 4, after the proximal end of the capillary tube 18 has been severed from the length of the capillary tube 18 the capillary tube proximal end must be sealed. If approximately four inches of capillary tube 18 are allowed to remain attached to the process tube 12 the capillary tube tip 18 can be inserted into a shaftway 22 in a swage block 24 in which a perpendicular threaded shaft 26 has been formed in which the threaded end 28 of a shaft 30 can be inserted and rotated by a handle 32 in order to drive a rounded tip 34 against the capillary tube 18 and against the anvil base 36 formed in the swage block 24 to seal the capillary tube 18. This sealing operation can be carried out at several points along the length of the capillary tube tip 18 to insure proper sealing of the capillary tube 18. 
     Having described a preferred embodiment of my invention, it is understood that various changes can be made without departing from the spirit of my invention, and, I desire to cover by the appended claims all such modifications as fall within the true spirit and scope of my invention.