US1991013A

US1991013A - Method and apparatus for coating the interior of mold surfaces

Info

Publication number: US1991013A
Application number: US607210A
Authority: US
Inventors: Irl R Cline
Original assignee: Western Brick Co Ltd
Current assignee: Western Brick Co Ltd
Priority date: 1932-04-23
Filing date: 1932-04-23
Publication date: 1935-02-12
Anticipated expiration: 1952-02-12

Description

I. R, CLlNE Feb. 12, 1935.

METHOD AND APPARATUS FOR COATING THE INTERIOR OF MOLD SURFACES Filed April 23, 1932 Patented Feb. 12, 193,5

METHOD AND APPARATUS FOR COATING THE INTERIOR OF MOLD SURFACES Irl R. Cline, Danville, Ill., assignor to Western Brick Company, Danville, 111., a corporation of Illinois 0 Application April 23, 1932, Serial No. 907,210

Claims.

This invention relates to a new and improved method and apparatus for coating the interior of V mold surfaces with a slipping agent and more particularly to a method and apparatus for moistening mold surfaces to cause the adhesion of such slipping agent.

The slipping agent is usually natural sand.

In some cases it is also the function of the slipping agent to produce a texture or color on the brick surface.

With some types of natural sands, the sand ing of the molds is easily accomplished by passing the damp molds through a sand bath where sufficient sand adheres to them to produce the desired results. With other types, such as those made from crushed, burned brick-difficulties are encountered because the sands do not adhere to the molds in sufiicient quantities. Such sands, being somewhat more absorbent, require more moisture. in the molds to provide the necessary capillary adhesion.

Efforts have been made to overcome the diiiiculty by applying additional moisture in the form of a water spray to the inside of the molds. The results of such efforts have not been fully efiective because of difficulties inobtaining a satisfactorily uniform atomization and distribution of the water.

According to the present invention, jets of steam are directed upon the molds. This steam condenses upon contact with the mold surfaces.

which are relatively cool and usually slightly moist from previous use. 1

It is an object of the present invention to provide a new and improved method for sanding molds or the like.

It is afurther object to provide an apparatus for carrying out the improved method.

It is also an, object to provide method and apparatus for directing a jet of steam upon a mold surface. Y

It is an additional object to provide a method Figure 2 is a fragmentary section taken on 1 collect in the pipe above thevalve 34 and below line 2-2 of Figure 1;-and

Figure 3 is a perspective view showing a mold."

portions being broken away to clearlyshow the structure. 1 1

Referring first to Figure 3,. the molds used comprisefront and back strips 11 which are alike, the mold being interchangeable as to these two faces. The mold is provided with a plurality of partitions 12 which dividevthe mold into seven compartments 13. Thus each mold will contain seven formed-blanks for bricks.

Each compartment 13 is closed by a bottom member 14. It is to be noted that partitions 12 do not extend down as low as the bottom members 14 so that recesses 15 are formed on the under side of the mold. The front and back members 11 extend downlower than the partition members 12.

The brick sanding machine. shown in Figure 1 includes a loading slide 16 which extends upon an angle and is adapted to receive a plurality of the brick molds 1'7. These molds are placed in contactwith each other and move down the slide 16 by gravity. The sanding machine is driven through the shaft 18 carrying the. large wheel 19. This shaft 18 carries the cylindrical member 20 about which passes the continuous belt 21. This belt also passes about the enlarged

rotating shafts

22 and 23 and contacts with an edge of the disc ends 24'of the sanding drum. Sand is loosely piled as indicated at 25 within the pocket or cavity formed between the ends 24 of the sanding drum and closed at its lower side and left hand side as seen in Figure 1, by

the continuous belt 21. The molds 17 pass down from slide 16 on to. the continuous belt 21 and are carried by that beltup around until they incline inwardly, when they are caught upon the discharge arms 26. It will be understood that they reach these arms upside down and that surplus sand will fall out of the molds upon and between the arms 26, where it will be returned to the mass of sand 25 in the machine. From their position on the arms 26 the molds are removed by the operator to be placed in the brick v molding machine.

In order to properly coat the molds with moisture beforethey enter the sanding area of the machine, I have provided the steam header 27 secured to the frame member 39 of the sanding machine. The header 27 is fed with steam through the hose 28 which is connectedto the valve 29. This valve 29 is connected by pipe 3 0 to the steam main 31. 'The steam main 31 is provided with an ordinary type. of control valve which closes off the end of the main from the pipe portion 33 which connects to the source of steam supply. The lower end of the main 31 is controlled by valve'34 which may be opened todischarge any condensed water which may allow steam to pass to hose 28 and header 27. The header 27 is provided with a plurality of discharge pipes 37Qwhich are closed except' for openings drilled at" angles therein adjacent the ends 38. These pipes 37, as best shown in Figure 2, are so located as to each be above a median portion of a brick receiving cavity 13 in the mold 17. It will be apparent from Figures 1 and 2 that the valve handle 35 is so located as to normally fit within a recess 15 below the partition member 12 between brick forming cavities. It is of sufiicient length, however, to be struck by'the front and back strips 11 of the molds as they pass down the slide 16.

In the operation of the apparatus the shaft 18 is rotated to cause continuous movement of the belt 21. Molds are fed into the slide 16 so as to keep the slide normally filled to a point above the discharge pipes 37. The valve handle 35, as shown in Figure 1, is normally in its clockwise position, which means that the valve 29 is open. The valve 32 is opened an amount sufilcient to permit a flow of steam such as to give the desired discharge from the pipes 37. This steam discharge into the brick cavities will bring the steam into contact with the cool walls of these cavities and the steam will immediately condense on the walls, forming the desired film of moisture.

As the molds 17 move downwardly on the slide 16, the boards 11 will engage-the handle 35 and move it in the counterclockwise direction so that no steam will be discharged as the top edges of the boards 11 pass under the discharge pipes 37. This prevents waste of steam and also prevents the' undesirable adhesion of sand to the upper edges of the mold. As soon as the boards 11.- have passed over the handle 35, the spring 36 will move the handle 35 .in the clockwise direction to restore the valve 29 to the open posi tion, thus causing a discharge of steam into the brick holding cavities of the succeeding molds 17. The steam discharge nozzles are closely adjacent the molds and preferably clear the upper edges of the molds by approximately a quarter of an inch.

The amount of steam admitted'is controlled by an adjustment of the valve 32. The water trap in the pipe above the valve 34 assures having dry steam at the discharge pipes insuring a uniform film of moisture over the entire mold surface. With this-apparatus a suificiently accurate control is had so that a uniform and satisfactory sanding of the brick is' had. This method not only enables the application of a heavier and more uniform coat of sand, but also permits the use of larger grains of sand which is a decided advantage in producing desired surface textures. This process permits the use of a greatvariety of sands, both natural sands and those formed by crushing various materials which could not be used with prior methods and makes possible a development of wider ranges in textures and wall efifects.

While I have shown and described one pre ferred method and apparatus for carrying out my invention. these are to be understood to be illustrative only as the method and apparatus may both be varied to meet difiering conditions and requirements and I contemplate such changes and modifications as come within the spirit and scope of the appended claims.

taining a plurality of brick cavities, which comprises moving a continuous series of molds, injecting steam into each mold cavity at one point in its path of movement, and cutting off the steam flow as the mold edges pass the steam jet point.

2. The method of applying sand to brick molds or the like, which comprises directing a jet of steam against the inner mold surface, tumbling sand into the mold cavities and dumping excess sand by gravity from the mold cavities.

3. The method of applying sand to brick molds or the like, which comprises directing a separate jet of dry steam against the inner surface of each brick cavity, tumbling sand into the mold cavities, and dumping excess sand by gravity from the mold cavities.

4. Apparatus for moistening brick molds or the like, which comprises a mold guideway, a series. of steam jet pipes adjacent the mold path on the guideway, means for supplying steam to the jet pipes, and means for controlling he steam supply.

5. Apparatus for moistening brick molds or the like, which comprises a mold guideway, a series of steam jet pipes adjacent the mold path on the guideway, means for supplying steam to the jet pipes, and means actuated by movement of molds on the guideway for controlling the steam supply.

6. Apparatus for moistening brick molds or the like, which comprises a mold guideway, a series of steam jet pipes adjacent the mold path on the guideway, means for supplying steam to the jet pipes. a valve for controlling the amount of steam supply and a steam cut-ofl valve actuated hy movement of molds on the guideway.

'7. Apparatus for moistening brick molds or the like,.which comprises a mold guideway, a series of steam jet pipes adjacent the mold path on the guideway, means for supplying steam to the jet pipes, a valve for controlling the amount of steam supply and a steam cut-oil valve, said valve being normally opened and having a bandle extending into the path of molds on the guideway whereby said molds actuate the handle to cut off steam as mold edges pass adjacent the steam jet pipes.

8. Apparatus for sending brick molds or the like, comprising means for supplying steam to the mold cavities, means for introducing sand into said cavities, and means for removing excess sand.

9. Apparatus for sanding brick molds or the like, comprising a steam header having a plurality of jets, means for causing molds to pass adj :nfi said jets. means for supplying sand to the molds after they have passed under the ets.

10. Apparatus for sanding brick molds or the like, comprising a steam header having a plu- 't-; of jets, means for supplying steam to the ts, m. ns for controlling the supply of steam.

or causing molds to pass adjacent said means for supplying sand to the molds af ter they have passed under the jets, and means IRL R, CLINE.