Injection pump assembly for aerosol containers

Claim 2

A pump assembly for removing a liquidlike substance from an external container and injecting said liquidlike substance into a conventional aerosol container, the improvement comprising: a housing means; first means for connecting said housing means to said external container; second means, spaced apart from said first connecting means for connecting said housing means to said aerosol container; a pumping means located within said housing means, said pumping means including an inlet means and an outlet means; first liquid flow path means located within said housing wherein said first liquid flow path provides a means for transferring said liquid from said liquid container to said inlet means; second liquid flow path means located within said housing between said outlet means and said aerosol container, said second liquid flow path means being adapted to cooperate with the valve of said aerosol container to effect a vacuum seal and to allow a vacuum to be drawn in said pumping means; a check valve means located within said first liquid flow path means for controlling the flow of liquid therethrough; and locking means for locking said housing means to said aerosol container while said assembly is in operation.

Claim 3

The assembly of claim 1, wherein said pumping means comprises a pumping chamber located within said housing means, said pumping chamber having its top end open and its bottom end reduced to an elongated nozzle; and a plunger piston slidably positioned within and in sealing engagement with the wall of said pumping chamber.

Claim 4

The assembly of claim 2 which includes spring biasing means for biasing said plunger piston in one direction.

Claim 5

The assembly of claim 2, wherein said check valve means is adapted to be actuated by the presence of said liquidlike substance within said pumping chamber in order to close said inlet.

Claim 6

The assembly of claim 2, in which said nozzle is adapted to enter the valve of said aerosol can and to cooperate with said valve to create an atmospheric seal, permitting a vacuum to be drawn in said pumping chamber, the length of said nozzle being insufficient to open said valve.

Claim 7

The assembly of claim 2, in which said locking means comprises a cylindrical sleeve attached to the lower end of said housing means and a locknut threadedly engaging said housing means and encircling said sleeve, said nut being provided with a plurality of flexible undercut wings which are outwardly biased into locking engagement with said aerosol container by axial relative movement of said sleeve on rotation of said nut.

Claim 8

The assembly of claim 2, in which said plunger is provided with a plurality of radially extending lock lugs and said body is provided with a plurality of longitudinal slots in which said lugs ride, said lugs and slots cooperating to limit the upward travel of said plunger.

Claim 9

The assembly of claim 2, in which said plunger has a longitudinal bore, the upper end of which serves as the inlet to said pumping means, a movable sealing ball within said bore which cooperates with the upper end of said bore to seal said inlet, and a plug inserted into the lower end of said bore to limit the free movement of said ball, said plug being provided with openings permitting the flow of liquid from said bore into said pumping chamber.

Claim 10

A pump assembly for removing a liquidlike substance from an external container and injecting said liquidlike substance into a conventional aerosol container, the improvement comprising: a housing means; first means for connecting said housing means to said external container; second means spaced apart from said first connecting means for connecting said housing to said aerosol container; a pumping means located within said housing means, said pumping means including a pump chamber, a plunger slidably mounted in said chamber, and inlet means and outlet means for said chamber; first liquid flow path means located within said housing wherein said first liquid flow path provides a means for transferring said liquid from said liquid container to said inlet means, said first liquid flow path means including a bore in said plunger communicating with said pumping chamber through passage means formed in an end of said pumping chamber and capable of being operably connected with said liquid container; second liquid flow path means located within said housing between said outlet means and said aerosol container, said second liquid flow path means including a nozzle adapted to be placed in sealed communication with the valve assembly of a pressurized aerosol container, such that a vacuum may be produced by said pumping means whereby said liquidlike substance can be drawn into said chamber and forced into said pressurized aerosol container through the valving assembly of said container; check valve means located within said first liquid flow path means wherein said check valve means includes a valve seat formed in the upper region of said bore, and a movable sealing ball carried in said bore for engagement with said seat whereby said liquid substance is free to enter said chamber, but backflow of said liquidlike substance upon operation of said pumping means is precluded; and locking means for locking said housing means to said aerosol container while said assembly is in operation.

Claim 11

A pump assembly for removing a liquidlike substance from an external container and injecting said liquidlike substance into a conventional aerosol container, the improvement comprising: a housing means; first means for connecting said housing means to said external container; second means spaced apart from said first connecting means for connecting said housing to said aerosol container; a pumping means located within said housing means, said pumping means including a pump chamber, a plunger slidably mounted in said chamber, and inlet means and outlet means for said chamber; first liquid flow path means located within said housing wherein said first liquid flow path provides a means for transferring said liquid from said liquid container to said inlet means, said first liquid flow path means including a bore in said plunger communicating with said pumping chamber through passage means formed in an end of said pumping chamber and capable of being operably connected with said liquid container; second liquid flow path means located within said housing between said outlet means and said aerosol container, said second liquid flow path means including a nozzle adapted to be placed in sealed communication with the valve assembly of a pressurized aerosol container, such that a vacuum may be produced by said pumping means whereby said liquidlike substance can be drawn into said chamber and forced into said pressurized aerosol container through the valving assembly of said container; check valve means located within said first liquid flow path means wherein said check valve means includes a valve seat formed in the upper region of said bore, and a movable sealing ball carried in said bore for engagement with said seat whereby said liquid substance is free to enter said chamber, but backflow of said liquidlike substance upon operation of said pumping means is precluded; and locking means for locking said housing means to said aerosol container while said assembly is in operation.