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A material supply assembly for use with a spraying device, which material supply assembly includes a housing of stiff material comprising a side wall having a top end defining an opening into a recess defined by the housing; and a pre-filled container comprising a stiff annular lip adapted to be pos

A material supply assembly for use with a spraying device, which material supply assembly includes a housing of stiff material comprising a side wall having a top end defining an opening into a recess defined by the housing; and a pre-filled container comprising a stiff annular lip adapted to be positioned along the top end of the side wall, and a flexible portion fixed to the annular lip and adapted to extend into the cavity in the housing when the annular lip is positioned along the top end of the side wall. The flexible portion has an inner surface defining a cavity, and a quantity of material is within the cavity in the flexible portion. A polymeric membrane extends across and is sealed to the annular lip to retain the material in the cavity. The material supply assembly also includes an adapter assembly having a through opening, at one end of which is a transverse portion including a peripheral part adapted for engagement with the annular lip positioned on the top end of the container, and at the other end of which is a portion adapted to engage the inlet port of a liquid spraying device. Means are provided for securing the peripheral part to the housing with the annular lip therebetween. A piercing structure projects from the central portion and has a distal end portion adapted to pierce the membrane as the peripheral part is engaged with the annular lip positioned on the top end of the housing.

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1. A material supply assembly for use with a spraying device, the material supply assembly comprising:a housing of stiff material comprising a side wall having a top end, said side wall having an inner surface defining a recess in said housing, and said top end of said side wall defining an opening

1. A material supply assembly for use with a spraying device, the material supply assembly comprising:a housing of stiff material comprising a side wall having a top end, said side wall having an inner surface defining a recess in said housing, and said top end of said side wall defining an opening into said recess;a pre-filled container comprising a stiff annular lip adapted to be positioned along the top end of said side wall, a flexible portion fixed to the annular lip and adapted to extend into the cavity in the housing when the annular lip is positioned along the top end of the side wall, said flexible portion having an inner surface defining a cavity in said flexible portion opening through the annular lip, a quantity of material within the cavity in the flexible portion, and a polymeric membrane extending across and sealed to said annular lip to retain the material in the cavity;an adapter assembly having a through opening, having at a first end a transverse portion including a peripheral part adapted for engagement with the annular lip positioned on the top end of said container, and having at a second end a portion adapted to engage the inlet port of the material spraying device;means adapted for securing the peripheral part to the housing with the annular lip therebetween, anda piercing structure projecting from said transverse portion having a distal end portion adapted to pierce the membrane as the peripheral part is engaged with the annular lip positioned on the top end of the housing. 2. An assembly according to claim 1 wherein said material is paint. 3. An assembly according to claim 1 wherein said material is a liquid adhesive. 4. An assembly according to claim 1 wherein said material is a liquid sealing material. 5. An assembly according to claim 1 wherein said material is abrasive granules. 6. An assembly according to claim 1 wherein said material is a powder. 7. An assembly according to claim 1 wherein the piercing structure includes an outlet portion having a through central opening and having a periphery firmly engaged with a surface defining the through opening in the adapter assembly, a second opposite end comprising a conical piercing point adapted to pierce through the membrane sealed across the annular lip, and an inlet portion between said outlet portion and said piercing point projecting from said outlet portion and past the peripheral part of the transverse portion, the inlet portion having inlet passageways spaced around its periphery that communicate with the through opening in the outlet portion. 8. An assembly according to claim 7 wherein the filter assembly includes a filter screen extending across the inlet passageways. 9. A method for supplying material to be sprayed for a spraying device, said method comprising the steps ofproviding a pre-filled container by the steps ofproviding a stiff annular lip, and a flexible portion fixed to the annular lip having an inner surface defining a cavity in said flexible portion opening through the annular lip,placing a predetermined quantity of the material to be sprayed within the cavity in the flexible portion, andsealing a polymeric membrane across the annular lip to retain the material in the cavity;providing a housing of stiff material comprising a side wall having a top end and an inner surface defining a recess in the housing, with the top end of the side wall defining an opening into the recess;positioning the pre-filled container on the housing with the flexible portion in the recess in the housing and the annular lip on the top end of the side wall;providing an adapter assembly having a through opening between first and second ends, a transverse portion at the first end including a peripheral part adapted for engagement with the annular lip positioned on the top end of the container, and an end portion at the second end adapted to engage the inlet port of the spraying device;providing a piercing structure projecting from the central portion of the adapter assembly that has a distal end portion adapted to pierce the membrane of the pre-filled container as the peripheral part is engaged with the annular lip positioned on the top end of the housing;engaging the peripheral part of the adapter assembly with the annular lip positioned on the top end of the housing so that the projecting piercing structure pierces the membrane of the pre-filled container; andsecuring the peripheral part to the housing with the annular lip therebetween. 10. A method according to claim 9 wherein said step of providing the pre-filled container is performed at a location remote from the other steps of the method. 11. A method according to claim 9 wherein said material is paint. 12. A method according to claim 9 wherein said material is a liquid adhesive. 13. A method according to claim 9 wherein said material is a liquid scaling material. 14. An assembly according to claim 9 wherein said material is abrasive granules. 15. An assembly according to claim 9 wherein said material is a powder.