Injector

Claim 2

In combination with a spray gun including a handle and a muzzle and means for controlling the flow of a liquid through said muzzle, an injector comprising: a main body portion, a flow passage formed through said main body portion for accommodating the flow under pressure of a first liquid through said passage, means mounting said main body portion on said gun with said passage communicating with said muzzle whereby said flow of said first liquid through said passage is controlled by said spray gun flow controlling means, means for injecting a second liquid into said passage, means for transmitting said pressure of said first liquid to said second liquid to pressurize said second liquid for injection into said passage, valve means controlling injection of said second liquid into said passage, valve actuating means for selectively actuating said valve means, said spray gun flow controlling means and said valve actuating means being located adjacent each other and said handle and thereby simultaneously actuatable by a hand gripping said handle.

Claim 3

The injector of claim 1 wherein: said passage has a venturi-shaped portion, and said second liquid injecting means interconnects with said passage at said venturi-shaped portion thereof.

Claim 4

The combination of claim 1 wherein said pressure transmitting means includes: a pressure transmitting chamber, means interconnecting said pressure transmitting chamber and said passage at a first point along said passage, and means interconnecting said pressure transmitting chamber and said passage at a second point along said passage for the injection of said second liquid into said passage.

Claim 5

The injector of claim 3 wherein: said second point along said passage is downstream of said first point along said passage.

Claim 6

The injector of claim 4 wherein: said passage includes a venturi-shaped portion adjacent said second point therealong.

Claim 7

The injector of claim 3 further comprising: a transparent sight gauge communicating with said second point along said passage upstream thereof for indicating flow of said second liquid to said second point along said passage.

Claim 8

The injector of claim 3 wherein: said main body portion is provided with port means communicating with said second point along said passage through which said second liquid flows to said second point along said passage.

Claim 9

The injector of claim 7 further comprising: a metering valve for regulating the rate of flow through said port means.

Claim 10

The injector of claim 7 further comprising: calibrating means communicating with said port means upstream of said second point along said passage.

Claim 11

The injector of claim 1 further comprising: removable orifice means received in said passage for controlling the flow of said first liquid through said passage.

Claim 12

The combination of claim 1 wherein: said valve actuating means comprises trigger means pivotably mounted on said main body portion and attached to said valve means for actuation thereof.

Claim 13

The injector of claim 11 wherein: a portion of said trigger means straddles said main body portion.

Claim 14

The injector of claim 1 wherein: said main body portion comprises an upper section and a lower section.

Claim 15

The injector of claim 13 wherein: said passage is formed in said lower section, and said upper and lower sections are provided with interconnected port means in communication with said flow passage.

Claim 16

The injector of claim 1 wherein said pressure transmitting means comprises: a liquid tight canister of generally cylindrical configuration, and a generally cylindrical diaphragm received in said canister and dividing said canister into first and second pressure chambers.

Claim 17

The injector of claim 15 wherein: the volume of said diaphragm is substantially equal to the volume of said canister.

Claim 18

The injector of claim 15 wherein: the volume of said canister is at least twice as great as the volume of said diaphragm.

Claim 19

The injector of claim 15 further comprising: drainage grooves formed in an inner surface of said canister in said first chamber thereof.

Claim 20

An injector comprising: a main body portion having upper and lower sections, means defining a passage through said lower section of main body portion for the flow of a first fluid under pressure through said passage, means for interconnecting said passage with a source of said first liquid under pressure, a removable, cylindrically shaped orifice member received in said passage for controlling the flow therethrough, means defining a first opening through said lower section of said main body portion into said passage upstream of said orifice member, a liquid-tight canister having a flexible diaphragm mounted therein and dividing said canister into first and second pressure chambers, conduit means interconnecting said first opening and said first pressure chamber, means defining a second opening into said lower section of said main body portion at a point spaced from said passage, a second conduit interconnecting said second chamber and said second opening to permit the passage of a second liquid from said second pressure chamber into said second opening, first port means formed in said upper portion of said main body portion, a transparent sight gauge interposed between and interconnecting said second opening and said first port means for permitting observation of the flow of said second liquid therethrough, second liquid flow regulating means disposed in said first port means for regulating the flow of said second liquid therethrough, second port means formed in said lower section of said main body portion and communicating with said first port means in said upper section of said main body portion and said passage through said lower section of said main body section at a point downstream of said first opening, valve means controlling the flow of said second liquid through said second port means into said passage, said passage including a venturi-shaped portion for sucking said second liquid from said second port means into said passage, trigger means straddling said main body portion and interconnected to said valve means for controlling actuation of said valve means, latch means for engaging said trigger means and holding said valve in an open position thereof, and a calibration opening formed in said lower section of said main body portion in communication with said second port means.

Claim 21

An injector comprising: a main body portion having upper and lower sections, means defining a passage through said lower section of main body portion for the flow of a first fluid under pressure through said passage, means for interconnecting said passage with a source of said first liquid under pressure, a removable, cylindrically shaped orifice member received in said passage for controlling the flow therethrough, means defining a first opening through said lower section of said main body portion into said passage upstream of said orifice member, a liquid-tight canister having a flexible diaphragm mounted therein and dividing said canister into first and second pressure chambers, conduit means interconnecting said first opening and said first pressure chamber, means defining a second opening into said lower section of said main body portion at a point spaced from said passage, a second conduit interconnecting said second chamber and said second opening to permit the passage of a second liquid from said second pressure chamber into said second opening, first port means formed in said upper portion of said main body portion, a transparent sight gauge interposed between and interconnecting said second opening and said first port means for permitting observation of the flow of said second liquid therethrough, second liquid flow regulating means disposed in said first port means for regulating the flow of said second liquid therethrough, second port means formed in said lower section of said main body portion and communicating with said first port means in said upper section of said main body portion and said passage through said lower section of said main body section at a point downstream of said first opening, valve means controlling the flow of said second liquid through said second port means into said passage, said passage including a venturi-shaped portion for sucking said second liquid from said second port means into said passage, trigger means straddling said main body portion and interconnected to said valve means for controlling actuation of said valve means, latch means for engaging said trigger means and holding said valve in an open position thereof, and a calibration opening formed in said lower section of said main body portion in communication with said second port means.

Claim 22

In combination with a liquid-tight canister having a diaphragm separating said canister into first and second chambers, means for withdrawing a first liquid from said first chamber while filling said second chamber with a second liquid comprising: a flow line connected at both ends with a supply of said first liquid, means for pumping said first liquid through said flow line, means defining a venturi-shaped section of said flow line opening downstream in the direction of flow through said flow line, conduit means interconnecting said first chamber of said canister and said venturi-shaped portion of said flow line, a supply of said second liquid, and a conduit means interconnecting said supply of said second liquid and said second chamber of said canister, whereby as said first liquid is pumped through said flow line said venturi portion thereof sucks said first liquid from said first chamber of said canister and causes said second liquid to flow from said source thereof into said second chamber of said canister.

Claim 23

In combination with a liquid-tight canister having a diaphragm separating said canister into first and second chambers, means for withdrawing a first liquid from said first chamber while filling said second chamber with a second liquid comprising: a flow line connected at both ends with a supply of said first liquid, means for pumping said first liquid through said flow line, means defining a venturi-shaped section of said flow line opening downstream in the direction of flow through said flow line, conduit means interconnecting said first chamber of said canister and said venturi-shaped portion of said flow line, a supply of said second liquid, and a conduit means interconnecting said supply of said second liquid and said second chamber of said canister, whereby as said first liquid is pumped through said flow line said venturi portion thereof sucks said first liquid from said first chamber of said canister and causes said second liquid to flow from said source thereof into said second chamber of said canister.