US1829795A - Apparatus for molding cement blocks - Google Patents

Description

Nov. 3, 1931. E. v.1. GARVIN 1,829,795

APARATUS FOR MOLDING CEMENT BLOCKS Original Filed Jan. 15, 1926 2 Sheets-Sheet 1 grwwnto'p Nov. 3, 1931. E. J. GARVIN I 1,329,795

APPARATUS FOR MOLDING CEMENT BLOCKS I Original Filed Jan. 15, 1926 2 Sheets-Sheet 2 Patented Nov. 3, 1931 UNITED STA rss PATENT OFFICE EDWARD J. GARVIN, OF LOS ANGELES, CALIFORNIA, ASSIGNOB TO CONCRETE ENGINEERING & EQUIPMENT 00., OF OLARKSDA LE, ARIZONA, A CORPORATION OF ARIZONA APPARATUS FOR MOLDING CEMENT BLOCKS Application filed January 13, 1926, Serial No. 80,921. Renewed August 5, 1929.

' molding cement blocks and more particularly to. an apparatus for molding hollow cement,

. concrete or like material tile.

An object of this invention is to provide an apparatus for molding hollow concrete tile in which means are provided for feeding the material into the mold, tamping the material in the mold and for inverting and ejecting the molded tile from the mold upon the formation of the same.

Another object of this invention is to provide an apparatus for molding hollow concrete or cement tileinwhich cores are employed in a molding'box and which molding box and cores are, upon introduction of the material into the molding-box and tamping the same, inverted so as to permit the ejecting of the molded tile from the molding boxes, after which the molding boxes and cores are again raised or inverted to the elevated position.

i tile.

Another object of this invention is to provide an automatic tamping means for'tamping the material in the molding boxes around the cores so as to form the hollow concrete Another object of this invention is to provide a tile or block molding machine having a molding box unit and an automatic tamping unit which may be operated to tamp the concrete into the mold as the same is filled.

Another object of this invention is to provide a tile or block molding machine in which automatic tamping means are provided and means for automatically feeding the material into the molds during the operation of the tamping means. i

Another object of this invention is to provide a tile or block molding machine in which the blocks are formed, tampered in a moldingbox and subsequently ejected from the said box.

Other objects and advantages of this invention will be apparent from the following detailed description of a preferred embodiment thereof as illustrated in the accompanying drawings, in which drawings:

Figure 1 is a front elevation of an apparatus for molding cement blocks embodying this invention.

Figure 2 is a side elevation thereof, taken substantially on the line 2-2 of Figure 1.

Figure 3 is a top plan View thereof.

Figure l is a fragmental top plan view thereof, illustrating'the tamping means as removed.

Figure 5 is a sectional side elevation thereof, taken substantially on the line 5-5 of Figure 4, illustrating a cover board clamped in position prior. to inverting the molding box.

Figure 6 is a fragmental sectional end elevation illustrating the molding box, cores and blocks in the inverted position ready to eject the blocks therefrom and showing in dotted lines the blocks as ejected.

Figure ,7 is a fragmental perspective end view showing the movable ejecting frame unit as detached from the machine.

In the preferred embodiment of this invention, illustrated in the accompanying drawings, A illustrates a main frame unit in which an invertible molding box unit B and ejecting frame unit C are mounted and which frame unit A supports an automatically operated tamping unit D.

The frame unit A comprises a base 1 to which vertically extending uprights 2 are secured. The uprights 2 are secured at their upper ends to angle irons 3 at corner plates 4. Spaced uprights 5 are secured to the base 1 at their lower ends and at their upper ends to a hopper table 6. Braces 7 are provided which are secured to the table 6 and to the uprights 5. Braces 8 are secured to the base 1 and to the uprights 2. Longitudinally 'extending angle irons 9 are secured to the uprights 2 at points elevated from the base 1 and bearing supporting bars 10 are secured to the uprights 2at a point elevatedfrom the frame members 9.

Mounted within the frame unit A is a molding box unit B which comprises a molding box 11 which is supported upon a shaft 12. The shaft 12 is journaled in bearings 13 mounted upon the bearing bars 10 of the frame unit A. The molding box 11 is a rectangular box having no bottom and a partimolding box 11 is formed of sides 17 and ends 4 18 and is secured to angles 19 at its respective corners, which angles 19 also form guides for the ejector frame. Cores 20 are mounted within the chambers 15 and 16 and are preferably constructed and metal stamped so as to provide a lower tapered portion 21 and an upper or steeply inclined tapered portion 22 which terminates in an upper plate 23 which closes the cores at the upper end. The bottom of the cores 20 are provided with core clamps, 24 which core clamps 24 comprise base plates 25 and transversely extending bars 26 which are secured to the base plate 25by means of bolts. The bars 26 extend across the cores 20 of which there are preferably two mounted in each chamber 15 and 16 and hold the same in spaced relation within the said chambers. The bars 26 extend across the bottom ed es of the cores 20 so that the same are rigidly maintained in position. The bars 26 are clamped to the inwardly extending portions of the cores 20 by taking up on the bolts by means of which the bars 26 are secured to' the plate 25. The bars 26 extend across the overlapping portions 28 of the cores 20. The cores are maintained'spaced apart by means of the bolts which pass through the plate 25 and bars 26.

Secured to the over-lapping portions 28 of the cores 20 are ears 29 which'provide bearings through which the shaft 11 extends so that the cores 20 are frictionally mounted on bearings on theshaft 11.

The ejector frame unit C is preferably of the following construction and comprises longitudinal extending angle irons 30 which are spaced apart and which are secured at their opposite ends to lower guide irons 31, to

which guide irons 31 vertically extending ejector frame angles 32 are secured and to which vertically extending angle irons .32, second ide irons 33 are secured at points spaced rom the lowerguide irons 31. Secured tothe shaft 12 between guides 31 and 33 are cams 34, An ejector bottom 35 which forms a bottom for the core box 11 and is shaped to fit around the cores 20 is supported on studs 36. The studs 36 at their lower ends are secured to the longitudinally extending frame members 30 of the ejector unit C. I

Means are provided which are connected to and movable with the ejector frame unit C for clamping a cover-plate 37 over thechamhere 15 and 16 prior to the rotation of themolding box unit B-of the shaft 12. These clamp members preferably comprise T- shaped clamp bars 38 which are secured to pins 39, which pins 39 pass through transversely extending angle irons 40 and segmentalangle irons 41 which are secured to the angle irons 40. Compression springs 42 are mounted upon the pins 39 between the head 43 of the pin 39 and the segmental angle irons 41 and yieldablyurge the T- shaped clamp member 38 downward to clamp the cover-plate 37 against the upper edges of the sides and ends of the core-box 11. Plates 44 are secured to the angle irons 41 and extend inwardly and support spaced studs 45 which bear against the under-surface of the cover-plate 37 to cooperate with the .T- shaped latch members 38 to hold the coverplate 37 in position when theejector frame has been actuated to eject the molded blocks from the core box as'will hereinafter appear. Lugs 46 are secured to the upper front ends of the top of the molding box 11in position to engage the ends of the transversely extending angle irons 47 which are secured to the uprights 5 and are supported by means of posts 48 secured to transversely extending basewheels 50 is provided with handles 52 for rotating the cams 34 to invert the molding box 11 and to actuate the ejector frame unit C in the manner that will hereinafter be described.

Secured to the base-plates 49 are adjustable studs 53 which are positioned in spaced apart positions to receive the cover-plate 37 carrying the molded blocks or tile as the same have been ejected from the molding box 11. These studs 53 are adjustable in position so that the same may be adjusted accurately to the position to which the cores are ejected, by the ejector frame.

The automatic tamping unit preferably comprises a pair of tamping heads 54 which are secured-to transversely extending guide bars 55 which are mounted between the uprights 2, the guide bars 55 being spaced apart a distance equal to or slightly greater than the width of the uprights 2 so as to guide the said heads 54 during the reciprocation thereof. Angle irons 56'are secured across the guidemembers 55 in position toengage the inner edges of the uprights 2 and likewise act as guides for the tamping heads 54. Secured to the guide bars 55 are uprights 57 which are placed by bars 58 and are secured at their upper ends to a guide frame 59 which is similar in construction to the guide frame grovided by the guide members 55 and 56.

64 is driven upon anysuitable source ofv power, not shown. Lifter cam arms 65 are rigidly secured to the shaft 61 in position to engage the cam 60. The lifter cam arms 65 carry rollers 66 at their opposite ends so that upon rotation of the shaft 61, the rollers 66 of the roller cam arms engage the cams 60 to raise the tamper head 64. Upon further rotation of the lifter cam arms65, the rollers 66 pass under the cams 60 and permit the tamper heads 54 to fall by gravity to tamp the blocks within the molding box 11.

In order to support the tamping heads 54 in an elevated osition during the filling of the molds, latcli means are provided which preferably comprise a latch arm 67 which is rigidly secured to a latch shaft 68 which is mounted in brackets 69 which are secured to the frame unit A at the upper end thereof. Secured to the opposite end of the latch shaft 68 is a latch bar 70 which provides a latch shoulder 71 which is adapted to be engaged under the transverse extension of the angle iron 59 so as to hold the frame supporting the tamping heads 54 in an elevated position. The latch handle 67 is bent inwardly as illustrated at 72 and is adapted to be enga ed with a hookmember 7 3 which prevents ,t e latch handle 67 from being rotated forward out of reach of the operator of the machine, the latch member 70 being engaged under the shoulder 71 in a vertical position. The strain upon the latch member 70 is vertical so that when in a latching position there will be no tendency of the latch member 70 to become disengaged. a

The molding box unit has been illustrated as being adapted for forming two hollow or cored'concrete tile, however the molding box unit might be'varied at will to enable the formation of any suitable size and number of tile.

in order that the cases 20 may be changed at will and properly positioned upon the shaft 12, the bearings 13 are movably mounted on the shaft'12.

Means are provided for automatically feeding the concrete, cement, or the like into the molding box during the operation of the tamping unit D which means preferabl comprise an inclined chute 75 having an en arged receiving hopper-head 76 into which the material is dumped from a conveyor diagrammatically illustrated at 77.113 gate 78 is provided in the chute 75 so asto arrestthe delivery of the material when the tamping unit D is stopped during the ejecting of themolded product from the molding box unit B. The 'c'hute 75 extends to a position directlyl over the molding box unit B and over the tamping heads 54 which are hollow and delivers the material through and around the said heads 54 into the molding box unit. V

The operation of this machine is as follows: Concrete, cement or like material is fed from a hopper 75 of any desired or preferred construction into the molding box 11 or onto .fall into the concrete an the table 6 thereof, the concrete or like material being drawn from the table 6 by means of a board or other scraping means into the molding box 11 into spaces in the molding box around the molds 20. The latch handle 67 is then actuated to release the latch andermit the tamping heads 54 to fall. The pu ley 64 is driven from any suitable source of power to raise and permit the tam ing heads 54 to is thoroughly tamped within the molding box 11 around f the molds 20. After the tamping has been completed, the latch member 67 is swung into position so that the latch arm 70 engages the shoulder 71 which permits the latch lift-er means 65 to rotate without permitting the tamping heads to fall. A cover-plate 37 is then placed over the top of the molding box 11 and the T-shaped clamps 38 are rotated to engage the edges of the cover-plate 37 to hold the same securely in position. The op erator then rotates the cams 34 by means of handles 52, which rotation results in the revolving of the entire invertible molding box unit B and ejecting frame unit C from the position illustrated in Figure 5 to the posi-- The lugs 46 then engage the ends of the angle irons47 and prevent further rotation of the molding box unit B and ejecting unit C. On further-rotation of the cams 34 and the shaft 12, the shaft 12 rotates relative to the bearings 29. This causes the cams 34 to cause the ejecting unit C to move vertically by the engagement of the cams 34 with the guide arms 31 and 33. The molding unit B remains stationary and the angle irons 19 guide the ejecting unit asthe same are engaged with the angle irons 32. ,The vertical movement of the ejecting unit 0 causes the false bot tom 35 to be forced downwardly to push the molding blocks of tile from the molding box. Upon a rotation of 180 of the came 34, the e'ector unit C is paused to completely eject the molded blocks or tile from the moldin box 11 from the position illustrated in in! lines to the position illustrated in dotted lines in Figure 6, the cover-plate 37 eventually coming to rest upon the adjustable studs 53. The T-shaped clamps 38 are then released and the cam 34 is rotated inthe opposite direction to return the moldin box 11 and the ejecting unit C to the position illustrated iii Figure 5 so that the same are ready to receive another charge of material to mold anotherset of blocks.

The provision of the automatic tamping unitD,together with the upright molding box unit B and the chute 75 and the conveyor 77 while filling the p molding box has long been-sought as it enablesthe formationof a block of tile which is free from voids and may be easily and quickly removed from the molding box after formed.

Having fully described a preferred embodiment of this invention, it is to be understood that I do not wish to be limitedto the exact details herein set forth which may obviously be varied without departing from the spirit of my invention as set forth in the appended claims.

I claim:

1. In an apparatus of the class described, the combination of a frame unit, an invertible molding box mounted within the said frame, an ejector frame provided with a movable bottom for the said molding box unit, means for inverting the frame and box and means actuated by said inverting means for moving the said ejector unit vertically when the said molding'box unit has been inverted to eject the molded blocks from the said molding box unit.

2. In an apparatus'of the class described, the combination of a frame, a molding box unit mounted within the frame, a shaft, cores loosely supported on the said shaft, a movable bottom for the said molding unit and means mounted on the said shaft for supporting the said movable'bottom.

3.'In an apparatus of the class described, the combination of a frame-unit, a molding box unit mounted Within the said frame unit,

cores mounted within the molding box unit in upright position, a corner angle secured to thesaid molding box unit, and an ejecting unit adapted to be guided by the said 'corner angle.

block from the said molding box unit when the same is inverted.

7 In an apparatus of the class described, the combination of a molding box unit, an ejector unit, a shaft rotatably supporting the said units, cores mounted in the molding box, means journaled on said shaft and secured to said cores, means for rotating the sald shaft to invert the molding box unit, and

means operable on rotation of the shaft to actuate the said ejector unit to eject the molded product from the molding box unit. 8. In an apparatus of the class described, the combination of a frame unit, a molding box unit rotatably supported in the said frame unit, an automatic tamping unit adapted to automatically ta-mp the material in the said molding box unit while the same is being filled and while in the upright position, the said automatic tamping means ineluding a tamping head having a passage formed therethrough, hopper means for filling the said molding box unit through the said-passage, and means for rotating the molding box unit when the same is filled.

Signed at Los Angeles, California, this 31st day of December 1925.

I EDWARD J. GARVIN.

4. In an apparatus of the class described, 1

the combination of a frame unit,an invertible boxunit mounted within the said frame unit, an ejector frame unit, a cover-plate for the said moldin box unit, latch means for latching the sai cover-plate to the said ejector'frame unit, and means for moving the ejector frame unit with the said cover-plate for ejecting molded blo'cks from the said molding box unit when the said molding box unit is inverted.

- 5. In an'apparatus of the class described,

the combination of a molding box unit, an ejector frame unit having studs at its top, a cover-plate for the molding box unit adapt-' ed to be clamped on the sald studs, a movable bottom for the molding box unit, 811' ported by the ejector frame unit so that t e distance'between the movable bottom and cover-plate will remain the same while the molded block is being ejected from the molding box unit.

6. In' an apparatus of the 'class described, the combination of a frame unit,-a molding box unit supported on a shaft mounted in bearings in the said frame unit, the said

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