Abstract:
The invention provides apparatus and methods for injecting fluid such as sealing and balancing fluid into tires while they are inflated and mounted on wheels and especially for two tires mounted on a dual rim wheel. The invention overcomes problems of limited access to the valve stems and includes tools for bending the stem in place to facilitate application of the apparatus.

Description:
This is a continuation in part of U.S. patent application Ser. No. 09/039478 filed Mar. 16, 1998, incorporated herein by reference. 
    
    
     BACKGROUND OF THE INVENTION 
     This invention relates to apparatus for introducing sealing and balancing fluid into pneumatic tires and more particularly to devices for doing so while the tire remains pressurized and even mounted beside another tire on a vehicle. 
     U.S. Pat. No. 4,308,766 issued Jan. 5, 1982 to Myers reviews the problems inherent in introducing fluid sealant into a tire through the valve stem and the advantages of being able to do this without first deflating the tire. It discloses a device for unscrewing and removing the valve core, injecting the fluid, and replacing the valve core while the tire remains inflated. 
     One of the most important applications for such a device is on heavy duty trucks. The tires are mounted in a parallel pair on a dual tire rim. The valve stems are both mounted so that they extend toward one another on a common side. Access to the stems is through small openings in the wheel. 
     Myers teaches a structure with a laterally extending fluid inlet tube adjacent the stem connector that could not pass through the small openings to access the stems. It would be most useful to have a tool which can be used to inject sealing and/or balancing fluid into tires while they remain inflated and mounted on a dual tire rim wheel. 
     In Applicant&#39;s parent application Ser. No. 09/39478 filed Mar. 16, 1998 apparatus and method for injecting sealing and blancing fluid into already pressurized tires are described, in which separate elements must be serially attached and removed to perform the various steps required in the process. Improvements herein disclosed incorporate the various elements into a manifold, to reduce the number of parts and greatly simplify the process so that it may be employed by users with less training and skill. 
     SUMMARY OF THE INVENTION 
     It is accordingly an object of the invention to provide tools 
     that will enable a user to inject fluid into tires while they are mounted on dual rims and inflated. It is a further object that they provide means to unscrew the valve core, remove the valve core from a fluid injection path to provide a passage for the fluid unobstructed by the valve core, reinsert and screw in the valve core after the fluid has been injected, and all while the tire is inflated on a dual rim with limited access to the valve stem. 
     These and other objects, advantages and features of the invention will become more apparent when the detailed description is studied in conjunction with the drawings, in which like reference characters designate like elements in the various drawing figures. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a sectional view of two tires mounted on a dual wheel. 
     FIG. 2 is an exploded view of a tire valve stem bender. 
     FIG. 3 is a side elevation view of the valve stem bender bending the stem of an outboard tire while the tire is pressurized. 
     FIG. 4 is a top view of the first manifold mounted on an outboard tire valve stem. 
     FIG. 5 is a sectional detail of a portion of the manifold of FIG. 4. 
     FIG. 6 is a top view of the second manifold for use with an inboard tire valve stem. 
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
     Referring now first to FIGS. 1-3, a dual rim wheel 30 such as those mounted on heavy duty trucks is shown with an inboard tire 31 and an outboard tire 32 mounted on the wheel. Valve stems 33 and 34 are positioned at access apertures 38,44 to provide access for pressure testing and inflation at the valve stem ports 35. The angle of the stems may make it difficult to remove the valve cores 36 and pump sealant therein because access is so limited by the small apertures. It may be necessary to bend the valve stems of one or both tires while the tires are mounted and pressurized to permit the manifolds of the invention to be applied to the valve stems. The stems may be bent in place to the positions indicated by phantom lines 13 by use of the stem bender 40 of the invention. The bender 40 comprises an elongate stem bending lever 41 having a handle 42 at a first extremity and a stem receiving cylindrical passage 43 at a second extremity for receiving therethrough the free end of the valve stem. The cylindrical passage 43 is pivotally mounted on an axle 46 orthogonal to the long axis of the lever 41 to adjust the angle as required. The adjustable angle is fixed by means of the splined connection 47 cooperating with the inner gear 39 that is held in place by hairpin 57 through hole 58 in the axle 46. 
     The bender 40 may also include valve stem holder 48 having an elongate shaft 49, a handle 50 at one end and a stem engaging member 51 at another end that is pivotally mounted on axle 46 by adjustable angle means as described for the bending lever 41. The stem engaging member 51 has a slot 53 that is open at both ends and one side so that it may be easily placed on a stem close to the rim to hold the stem steady while bending the stem with lever 41. The holder is then easily removed from the bent stem. Because the bend forms between the holder 48 and the lever 41, the lever 41 is easily pulled free of the straight free end of a bent stem. This bender may also be employed to bend a stem to facilitate application of a compressed air chuck or a tire pressure gauge. 
     When the wheel holds the stem securely, holder 48 may not be required when bending the stem with the bender lever 41. 
     Referring now to FIGS. 4 and 5, apparatus and method for introducing tire sealant and balance fluid into the outboard tire through tire valve stem 34 will be described using first manifold 1. Manifold 1 has an anterior portion 2 that is small enough in dimension to fit through the first access aperture while holding the manifold by the posterior portion 3. Anterior portion 2 has a first body member 4 with an elongate straight bore 5 open at a first end that is provided with a quick release hydraulic sealing connector 6 of the type well known in the art, in which pulling on the outer knurled sleeve 26 disengages the connector from its grass on the outer threads of the stem 34. The bore 5 is closed at a second end by a wall 7 with an axial hole 8 therethrough. An elongate control shaft 9 extends through hole 8 and has a first shaft end 10 outside the bore and a second shaft end 11 within the bore having a valve core engaging element 12. Element 12 has two resilient prongs 27 with chamfered edges 28 adjacent a central gap for receiving the rectangular extending portion 37 of valve core 36. O-ring 45 seals the bore to the shaft 9 providing a freely translating and rotating seal so that the valve engaging element 12 may be advanced through the bore and the valve port onto the valve core and rotated to unscrew the core and then pull the core and element back through the bore until the sleeve 29 swaged on the shaft butts up against washer 52. This puts the core in the storage position 15. In practice, the air presure in the tire usually blows the core and shaft to this position. Since the shaft end 10 is inaccessible to the operator, control means 14 is provided to enable an operator at the posterior portion to rotate and translate the control shaft with knurled control element 18 attached to the secondary shaft 16 that is supported by a channel 52 in body member 4. Gear pair 17 causes the control shaft to rotate opposite to the secondary shaft and to translate together. 
     When the core has been stored at position 15, sealant fluid may be pumped into the tire through the connector 22 and control valve 21 attached to tubular passage 20 that is in communication with the axial bore 5 through lateral bore 19 without interference from the core. After dispensing the fluid, valve 21 is closed and air supply valves 23 and air gauge 24 are used to blow any sealant in the lines into the tire with an air supply attached to connector 25. Then the core is moved into the stem port and screwed tightly in place and manifold 1 removed. 
     Referring now to FIG. 6, apparatus and method for injecting tire sealant and balance fluid into the inboard tire through valve stem 33 will now be disclosed. 
     A second manifold 54 has an anterior portion 56 that is small enough to pass through the first and second access apertures of the wheel. It has an elongate tubular body member 57 with s straight through axial bore 58 that is open at a first end that has a quick connect hydraulic connector 59 that seals to the threaded outer surface of the valve stem port. It is much like the connector of the first manifold except that it is provided with a remote release assembly 60 for retracting the sleeve and releasing the connector from the posterior portion 56 away from the wheel when the operation is finished. 
     The body member 57 is connected to the posterior portion 56 by sealing connector 68 aligning the axial bore 58 with coaxial passage 61 in the posterior portion. The passage 61 terminates in wall 62 that has an axial hole therethrough that is sealed by an O-ring as described for the first manifold. An elongate control shaft 63 operated by knurled knob 65 is slidable within the bore 58 and passage 61 and terminates in core engaging element 64 for engaging, unscrewing, and moving the core to the storage position 66. A valve 74 with a through bore and a quick connector 75 may optionally be provided so that the core may be removed and replaced if desired without deflating the tire. A lateral bore 67 in the posterior portion communicates between the axial passage 61 and valve 69 and connector 70 to a supply of sealant fluid and also to valves 71, gauge 72 and connector 73 to a supply of compressed gas or air as described supra. 
     The above disclosed invention has a number of particular features which should preferably be employed in combination although each is useful separately without departure from the scope of the invention. While I have shown and described the preferred embodiments of my invention, it will be understood that the invention may be embodied otherwise than as herein specifically illustrated or described, and that certain changes in the form and arrangement of parts and the specific manner of practicing the invention may be made within the underlying idea or principles of the invention within the scope of the appended claims.