Foundry mold and core blowing machine

Claim 2

A continuous flow sand additive mixer for foundry sand forming machines comprising a source of dry sand, a drive motor, a sand valve, means to adjust the extent of opening of said sand valve to control the sand flow rate, an additive valve, and means operative to control the flow from said mixer by controlling the operation of said motor, sand valve, and additive valve.

Claim 3

A mixer as set forth in claim 1 including timer operated switch contacts for said motor and said sand valve, and relay operated contacts for said additive valve, whereby the motor, sand valve and additive valve will be energized simultaneously when said mixer is turned on, and the latter will be deenergized before said motor and sand valve when said mixer is turned off to stop the flow therefrom.

Claim 4

A continuous flow mixer for foundry sand forming machines comprising vertically oriented chambers, a source of dry sand, a sand valve controlling flow of sand from said source to the top chamber, means to adjust the extent of opening of said sand valve to control the sand flow rate, rotatable mixing arms in said chambers, a drive motor for said arms, and a sand additive metering device operative to meter an additive into one of said chambers.

Claim 5

A continuous flow mixer for foundry sand forming machines comprising vertically oriented chambers, a source of dry sand, a sand valve controlling flow of sand from said source to the top chamber, means to adjust the extent of opening of said sand valve to control the sand flow rate, rotatable mixing arms in said chambers, a drive motor for said arms, and a sand additive metering device operative to meter an additive into one of said chambers.

Claim 6

A mixer as set forth in claim 3 wherein said additive is a liquid and said metering device comprises a metering cylinder having a reciprocating plunger therein.

Claim 7

A mixer as set forth in claim 4 including drive means for said plunger operative initially to retract the same to draw liquid from a container and then extend the same to force liquid into one of said chambers.

Claim 8

A mixer as set forth in claim 3 including a sand flow sensor between said sand valve and said top chamber, and means to deenergize said motor if the sensor indicates the absence of sand flow.

Claim 9

A mixer as set forth in claim 3 including a cylindrical housing for each chamber, part of which is vertically hinged to provide access to the interior of each chamber.

Claim 10

A mixer as set forth in claim 3 including a scraper blades in each chamber moving closely adjacent the bottom wall of each chamber.

Claim 11

A mixer as set forth in claim 3 wherein said arms are substantially in the form of a convolute with the outer ends thereof trailing substantially behind the inner ends and moving adjacent the bottom of each chamber thereby to plow the sand radially outwardly.

Claim 12

A mixer as set forth in claim 3 wherein each arm extends to the peripheral wall of each chamber to require the sand to tumble over each arm.

Claim 13

A mixer as set forth in claim 3 wherein said arms are of increased uniform height at the outer ends thereof, the trailing upper edge of each being relieved to provide a relatively thin top edge.

Claim 14

A continuous flow sand additive mixer for foundry sand forming machines comprising a source of dry sand, a drive motor, a sand valve, an additive valve, means operative to control the flow from said mixer by controlling the operation of said motor, sand valve, and additive valve, a sand flow sensor on the exit side of said sand valve, a sand flow timer, and means interlocking said sand flow sensor and sand flow timer to stop said mixer after a predetermined interval on failure to obtain a predetermined sand flow

Claim 15

A continuous flow sand additive mixer for foundry sand forming machines comprising a source of dry sand, a drive motor, a sand valve, an additive valve, means operative to control the flow from said mixer by controlling the operation of said motor, sand valve, and additive valve, a sand flow sensor on the exit side of said sand valve, a sand flow timer, and means interlocking said sand flow sensor and sand flow timer to stop said mixer after a predetermined interval on failure to obtain a predetermined sand flow

Claim 16

A continuous flow sand additive mixer for foundry sand forming machines comprising a source of dry sand, a drive motor, a sand valve, an additive valve, means operative to control the flow from said mixer by controlling the operation of said motor, sand valve, and additive valve, said additive being a resin, and a catalyst valve, and means operative to open and close said catalyst valve with said resin valve.

Claim 17

A continuous flow sand additive mixer for foundry sand forming machines comprising a source of dry sand, a drive motor, a sand valve, an additive valve, means operative to control the flow from said mixer by controlling the operation of said motor, sand valve, and additive valve, said additive being a resin, and a catalyst valve, and means operative to open and close said catalyst valve with said resin valve.

Claim 18

A continuous flow sand additive mixer for foundry sand forming machines comprising a source of dry sand, a drive motor, a sand valve, an additive valve, means operative to control the flow from said mixer by controlling the operation of said motor, sand valve, and additive valve, and selector switches for said drive motor, sand valve and additive valve, each switch having a run and test condition, means operative to connect the control elements for said motor, sand valve and additive valve in series through said selector switches in the run condition thereof, and means operative to energize said motor, said valve and additive valve directly when said switches are in test condition.

Claim 19

A continuous flow sand additive mixer for foundry sand forming machines comprising a source of dry sand, a drive motor, a sand valve, an additive valve, means operative to control the flow from said mixer by controlling the operation of said motor, sand valve, and additive valve, and selector switches for said drive motor, sand valve and additive valve, each switch having a run and test condition, means operative to connect the control elements for said motor, sand valve and additive valve in series through said selector switches in the run condition thereof, and means operative to energize said motor, said valve and additive valve directly when said switches are in test condition.

Claim 20

A continuous flow sand additive mixer for foundry sand forming machines comprising a source of dry sand, a drive motor, a sand valve, an additive valve, and means operative to control the flow from said mixer by controlling the operation of said motor, sand valve, and additive valve; said mixer including vertically oriented stages, each stage having rotatable mixing arms and a common shaft through said stages driven by said drive motor to which said arms are connected.

Claim 21

A continuous flow sand additive mixer for foundry sand forming machines comprising a source of dry sand, a drive motor, a sand valve, an additive valve, and means operative to control the flow from said mixer by controlling the operation of said motor, sand valve, and additive valve; said mixer including vertically oriented stages, each stage having rotatable mixing arms and a common shaft through said stages driven by said drive motor to which said arms are connected.

Claim 22

A mixer as set forth in claim 15 including a cylindrical housing for each stage, part of which is hinged to provide access to the interior of each stage.

Claim 23

A mixer as set forth in claim 15 including scraper blades in each stage moving closely adjacent the bottom wall oF each stage.

Claim 24

A mixer as set forth in claim 15 including a discharge opening for each stage, each discharge opening being radially elongated and off set slightly in a contrarotative direction of said mixing arms from the opening of a preceding stage.

Claim 25

A mixer as set forth in claim 15 wherein said arms are substantially in the form of a convolute with the outer ends thereof trailing substantially behind the inner ends and moving adjacent the bottom of each stage thereby to plow the sand radially outwardly.

Claim 26

A mixer as set forth in claim 15 wherein each arm extends to the peripheral wall of each stage to require the sand to tumble over each arm.

Claim 27

A mixer as set forth in claim 15 wherein said arms are of increased uniform height at the outer ends thereof, the trailing upper edge of each being relieved to provide a relatively thin top edge.

Claim 28

A mixer as set forth in claim 15 wherein said additive is a resin, an air-over-resin storage tank, and means operative to control the pressure of such air to control the flow rate of such resin.

Claim 29

A mixer as set forth in claim 15 wherein said additive is a resin including a catalyst valve, said catalyst valve and sand valve being operative to admit sand and catalyst to the first stage, and said additive valve being operative to admit resin to the next stage.

Claim 30

A mixer as set forth in claim 15 including three stages, each stage having two mixing arms and two scraper blades rotating therein.

Claim 31

A mixer as set forth in claim 25 wherein said additive is a resin, a resin storage tank, a catalyst valve, a catalyst storage tank, a flush tank, and manually operable valve means operative selectively to connect said resin and catalyst valves to said flush tank.

Claim 32

A mixer for foundry sand forming machines comprising vertically oriented chambers, a source of dry sand, a sand valve controlling flow of sand from said source to the top chamber, rotatable mixing arms in said chambers, a drive motor for said arms, a sand additive metering device operative to meter an additive into one of said chambers, said additive being a liquid, and said metering device comprising a metering cylinder having a reciprocating plunger therein, drive means for said plunger operative initially to retract the same to draw liquid from a container and then extend the same to force liquid into one of said chambers, and a pneumatically operated piston-cylinder assembly operative to retract and extend said metering plunger.

Claim 33

A mixer for foundry sand forming machines comprising vertically oriented chambers, a source of dry sand, a sand valve controlling flow of sand from said source to the top chamber, rotatable mixing arms in said chambers, a drive motor for said arms, a sand additive metering device operative to meter an additive into one of said chambers, said additive being a liquid, and said metering device comprising a metering cylinder having a reciprocating plunger therein, drive means for said plunger operative initially to retract the same to draw liquid from a container and then extend the same to force liquid into one of said chambers, and a pneumatically operated piston-cylinder assembly operative to retract and extend said metering plunger.

Claim 34

A mixer as set forth in claim 26 including timer means operative to reciprocate said metering plunger, said timer means being settable to control the frequency of operation of said metering device.

Claim 35

A mixer as set forth in claim 27 wherein said additive includes two parts, an a metering device for each part operative to meter such parts into the top and next to the top chamber.