US3071834A

US3071834A - Molding apparatus

Info

Publication number: US3071834A
Application number: US18034A
Authority: US
Inventors: Lawrence F Tumey
Original assignee: FMC Corp
Current assignee: FMC Corp
Priority date: 1960-03-28
Filing date: 1960-03-28
Publication date: 1963-01-08
Anticipated expiration: 1980-01-08

Description

Jan. 8, 1963 F. TUMEY MOLDING APPARATUS 4 Sheets-Sheet 1 Filed March 28, 1960 mvzmon LAWRENCE a ruusv ATTORNEY Jan. 8, 1963 F. TUMEY MOLDING APPARATUS 2 t e e h s s t e e h S 4 Filed March 28, 1960 INVENTOR LAWRENCE F. TUMEY ATTORNEY Jan. 8, 1963 L. F. TUMEY 3,071,834

MOLDING APPARATUS Filed March 28. 1960 4 Sheets-Sheet :5

F'I E l mvsfiron uwasuoz-F. TUMEY ATTORNEY United States Patent 3,071,834 MOLDING APPARATUS Lawrence F. Tumey, Lakeland, Fla., assignor to FMC Corporation, a corporation of Delaware Filed Mar. 28, 1960, Ser. No. 18,034 2 Claims. (Cl. 25-121) The present invention relates to mold forms, and more particularly to forms for casting concrete structural members.

In the casting of concrete structural members, such as concrete piles or channel beams, mold forms are usually employed which are open at the top for reception of the fluid concrete mix. When the concrete mix has set and the molded product is to be removed from the mold, it must be possible to establish clearance between the product and the side walls of the mold. Such stripping clearance heretofore has usually been obtained by a device connected to the upper end of the mold side wall and adapted to draw the side wall away from the molded product. However, an undue expenditure of time and labor is required for the operation of a stripping device of this type.

It is an object of the present invention to provide improved molding apparatus.

Another object is to provide an improved mold which facilitates the stripping of a molded product therefrom.

Another object of the invention is to provide an im proved mold which reduces to a minimum the time and labor required to strip a molded product therefrom.

These and other objects andadvantages of the invention will become apparent from the following description thereof, taken in conjunction with the accompanying drawings, in which:

FIG. 1 is an end elevation, with the end wall removed,

of a mold for simultaneously casting two concrete piles,

one mold side wall and locking means therefor being shown in phantom in stripping position.

FIG. 2 is a partial plan of the apparatus of FIG. 1.

FIG. 3 is a partial side elevation of the apparatus of FIGS. 1 and 2.

FIG. 4 is an end elevation, with the end wall removed, of a modified form of mold of the present invention.

FIG. 5 is an end elevation, with the end wall removed, of another modification of the mold of the invention, two operative positions thereof being shown for the two mold sections, respectively.

FIG. 6 is .a partial plan of the apparatus of FIG. 5.

FIG. 7 is a partial side elevation of the apparatus of FIGS. 5 and 6.

Referring to the drawings, and particularly to FIGS. 1, 2, and 3, a double mold 10 is shown for use in casting two square concrete piles. The mold 10 is preferably of metal construction, and is divided into two sections 11 and 11", each being shown in closed-mold position and having therein a cast pile 12. The mold 10.is supported upon a mounting base 14 constructed of a pair of angle members 15 spaced transversely of the mold 10 and extending longitudinally thereof. The base 14 includes also a plurality of transversely extending angle members 16, each having one flange 17 secured infvertical position by any suitable means to corresponding ends of the angle members 15, the other flange 18 of each angle member 16 being uppermost and extending horizontally. The angle members 15 are bolted to legs 19 supported upon a cast ing bed 20 or other suitable surface. A

Two mold forms 24 are supported on the flanges 18 in spaced, parallel relation. Each of the forms 24 has a flat bottom wall 26 and vertical inner side walls 27, the latter being interconnected at spaced intervals longitudinally thereof by a series of gusset plates 28. welded 3,071,834 Patented Jan. 8, 1963 thereto. An inverted channel member 29 rests upon the upper ends of the gusset plates 28 and is likewise welded to the inner side walls 27 of the mold forms 24 with its upper, flat face substantially level with the upper edges of the walls 27. Each mold form 24 includes also an outer side wall 30 integral with the associated bottom wall 26. The corners between the

side walls

27, 30 and the associated bottom wall 26 are filleted, as indicated at 31. The upper edges of the walls 30 are turned outward to form flanges 32.

A plurality of spaced apart locking devices 34 are associated with each of the mold side walls 30. As best shown in FIG. 1, each of the locking devices 34 comprises a substantially L-shaped bracket 35 formed of angle iron and including a first, generally vertically extending leg 36 having a flange 38 welded to the outer surface of associated mold side wall 30, and a second leg 40 projecting laterally outward from the lower end of said first leg 36 with one flange 41 of the leg 40 in a plane which is inclined slightly from the horizontal.

A bearing bracket 42 is mounted on the horizontal flange 18 of one of the angle members 16, below the outer end of the leg 40 of each locking bracket 35. The bearing brackets are secured in place by bolts 43 which, as seen in the case of the mold section 11' extends through slots 44 in said flange 18, which slots are elongated transversely of the mold 10, thus making it possible to adjust the bracket 42 toward or away from the associated mold form. Each bearing bracket 42 is of channel shape, and 'a shaft 45 mounting .a cam 46 extends between and is rotatably journaled in the side walls thereof, as best seen in FIG. 3. A handle 47 is secured to one end of each shaft 45 for rotation of the associated cam 46 into a position to engage the camming surface 48 thereof with the inclined flange 41 of the associated locking bracket 35. The camming surface 48 is provided with a toe portion 48a and a heel portion 48b. When in'such position, the cam 46 serves, through said locking bracket 35, to support the outer mold side wall 30 in position for a moldingoperation. Theside wall 30 when so supported is at an angle of substantially 90 with respect to the bottom wall 26 of the mold form and is substantially parallel to the associated inner side Wall 27. Each cam 46 is rotatable by the respective handle 47 into a position of disengagement from the associated flange 41. The positions of the cam and handle upon disengagement are shown in phantom at 46a and 4711, respectively, in FIG. 1.

Each of the mold side walls 30 is constructed so as to have a normal or open-mold position, in which-it extends at an angle slightly greater than with respect to the associated mold bottom wall 26, as shown at 30a. Since each of the forms 24 is constructed of metal plate having "some degree of flexibility and resiliency, the respective side wall 30 can readily be moved into closed'mold position by movement of the associated cam 46 into engaged position, and will, under its own inherent resiliency, return to its normal or open-mold position 30a when the cam is disengaged. It is to assure that each side wall 30 can be made perpendicular to the respective bottom wall 26 when in closed position that the bearing brackets 42 are so mounted as to be horizontally adjustable, as hereinabove described.

It will be realized that any number ofthe locking devices 34 can be associated with each of the mold side walls30, depending upon the length of the latter. Two of the locking devices associated with each side wall are shown in FIG. 2.

The operation of the apparatus of FIGS."l-3 will be described with particular reference to the mold section 11'. The mold side wall is initially in its open-mold position shown at 30a,"and the cam 46 is in its disengaged position shown at 46a, the'handle 47 being in the raised position shown at 47a. The handle 47 is first rotated outward and downward, rotating the shaft 45 and cam 46 to bring the toe 48a of the cam into engagement with the flange 41 at' point 50. As rotation of the cam is continued, upward pressure is exerted against the leg 40, and the mold side wall 30 is forced inward, toward closedmold position, with resultant flexing of the mold form in, and possibly adjacent, the fillet 31 joining the wall 30 to the bottom 26. Rotation of the cam 46 is continued until the toe 48a thereof reaches the point 51, at which time the cam heel 48b will come into contact with the flange 41 at 52. The side wall 30 will thus be locked in closed-mold position, the bearing bracket 42 having previously been adjusted laterally of the supporting angle member flange 18 so that the mold side wall 30 will be perpendicular to the bottom wall 26 when the cam heel reaches this position.

When all of the locking devices 34 have been thus operated, fluid concrete mix is poured into the mold forms 24 for casting of the two beams 12'. After the concrete has set, the cams 46 of the several locking devices 34 are returned to their released positions as shown at 46a, by rotation of the handles 47 thereof upward and inward, as indicated at 47a. The mold side walls 30 will then re siliently return to their open-mold positions as shown at 30a and the beams 12 can be stripped from the mold.

A modified form of the mold of the invention, for the casting of a channel beam, is shown in FIG. 4. A mold form 54 of inverted channel shape is mounted upon a base 55, which may be similar in structure to the mounting base 14. Looking devices 56, similar to the locking devices 34, are positioned on the mounting base 55 and are associated with the side walls 58 of the form 54 similarly to the manner in which the locking devices 34 are associated with the side walls 38 of the mold forms 11. A gusset 59 reinforces the angle bar structure of each locking device 56.

One or more members 60 are removably mounted by any suitable means on the inner surface of each side wall 58, for the formation of any desired number of shear key recesses in the side wall of the concrete beam to be cast. Removability of the members 60 is desirable, in case the mold side walls 58 do not spring back sutficiently far when in open-mold position to permit clearance of the members 60 by the cast concrete beam during removal of the latter from the form.

Operation of the apparatus of FIG. 4 is similar to that of FIG. 1, and will therefore not be specifically described.

FIGS. 5, 6 and 7 illustrate a further modification of the mold of the invention, this form being for the formation of two octagonal concrete piles 65. It comprises a mold 70 mounted upon a base 72 similar in structure to the

bases

14 and 55, said mold being divided into two

sections

74 and 74. Inasmuch as said mold sections are identical in structure, only the section 74 will be specifically described. However, corresponding reference numerals are applied to both sections 74 and 74'.

The mold section 74 is comprised of a mold form 80 having a bottom wall 82, two

lower corner walls

84 and 86, and two generally vertically extending

side walls

88 and 90, these walls being adapted to form five of the sides of an octagonal concrete pile. The side wall 88 is at its upper end formed with an outwardly extending flange 91, and the side wall 90 is rigidly connected to the corresponding wall of the other mold section 74' by an inverted channel member 92 and a plurality of gusset plates 92a. The

side walls

88 and 90 are provided adjacent their upper edges with opposed, inwardly projecting

lips

93 and 94, respectively.

Two longitudinally extending

upper mold elements

96 and 98 of triangular cross section are mounted on a plurality of frames 99, each comprising two

vertical side members

100 and 102, respectively, connected together by cross members 104. The frames 99 are suspended by means of chains 106 connected to the cross members 104 and to a crane or other suitable suspension means (not shown). Each of the

elements

96 and 98 has a lower inclined wall 108 adapted to form one of the upper corner walls of the octagonal pile 65, and an upper inclined wall 110, at the intersection of which walls is mounted a triangular sealing strip 112 having a lower surface 114 aligned with the wall 108. A similar triangular strip 115 is mounted at the intersection of the wall 108 with the third vertical wall 116 of each mold element, said strip 115 having a lower surface 117 in alignment with the wall 108.

An angle member 118 is secured along one of its flanges 120 to the lower corner wall 84 of the form 80, the other flange 122 of said angle member extending laterally outward from the wall 84. A plurality of reinforcement webs or gussets 124 are mounted between the flange 122 and the side wall 88 and flange 91.

A plurality of bearing brackets 128 are mounted at spaced intervals longitudinally of the base 72 below the flange 122. A cam 130 is rotatably mounted in each bracket 128 and is operated by a handle 132 connected thereto, said bearing bracket, cam, and handle being similar in construction and manner of operation to the bearing bracket 42, cam 46, and handle 47, respectively, of the modification described above in connection with FIGS. 1 to 3. When the cam 130 is in its retracted position, the corner wall 84 and side wall 88 occupy their openmold positions due to the inherent resiliency of the metal of which they are formed. To prepare the mold 70 for use in casting a pair of columns 65, the mounting frames 99 are first lowered into positions such as that shown in the case of the mold section 74 with the

side members

100 and 102 resting on the flange 91 and the channel member 92, respectively. The sealing strips 115 are at this time in register with inner surfaces of the

lips

93 and 94, respectively, and

mold elements

96 and 98 are in place for formation of the upper corners of the octagonal pile 6 5. The several cams 130 are then rotated upward and inward by means of the handles 132 and into their effective positions as shown in the case of the mold section 74'. The resultant upward pressure on the flanges 122 of the angle members 118 cause movement of the

walls

84 and 88 into the closed-mold positions as shown for the mold section 74. Pressure exerted by the lips 93 on the associated sealing strips 115 causes a shifting of the frame 99 in the direction of the lip 94, and the

lips

93 and 94 then tightly engage the strips 115. Fluid concrete mix may then be poured into the complete mold form. After the concrete has set, the cams 130 are rotated back to their inoperative positions, permitting the

walls

84 and 88 to spring back into open-mold positions. The mounting frames 99 are then shifted a short distance toward the respective lips 93 for disengagement of the strips 115 from the lips 94, and then moved upward to raise the

mold elements

96 and 98. The cast columns 65 then can be stripped from the mold forms '74 and 74.

While three embodiments of the present invention have been shown and described herein, it will be understood that the apparatus is capable of further modification and variation without departing from the principles of the invention, and that the scope of the invention should be limited only by the scope and proper interpretation of the claims appended hereto.

The invention having thus been described, what is believed to be new and desired to be protected by Letters Patent is:

l. A mold for casting concrete structural elements comprising a rigid base structure, an elongated channel shaped mold mounted on said rigid base structure, said mold having a bottom wall formed of relatively flexible sheet metal with said bottom wall being attached to and stiffened along its length by said base structure, said mold having a first side wall mounted on said base structure a and a second side wall formed of relatively flexible sheet metal jointed to and unitary with said bottom wall, said -mined spacing, laterally projecting levers fixed to the stiffening legs of said second side wall and inclined at an acute angle outwardly and upwardly to said base structure, and actuating means located below said levers and mounted on said base structure extension means and in contact with said levers for flexing said resilient hinge to decrease the spacing of the upper edges of said side walls and bring said second side wall into a closed-mold position, said actuating means being laterally adjustable to adjust the closed mold position of said second side Wall.

2. A mold for casting concrete structural elements comprising a rigid base structure, an elongated channel shaped mold mounted on said rigid base structure, said mold having a bottom wall formed of relatively flexible sheet metal with said bottom wall being attached to and stiifened along its length by said base structure, said mold having a first side wall mounted on said base structure and a second side wall formed of relatively flexible sheet metal jointed to and unitary with said bottom wall, said rigid base structure having extension means projecting laterally past said second side wall said second side wall being stiffened by longitudinally spaced rigid legs that extend substantially from the lower edge of the wall to its upper edge, the junction of said stiffened side and bottom walls forming a resilient hinge, said hinge normally positioning said second side wall in an open'mold position wherein the upper edges of said Walls have a predetermined spacing, laterally projecting levers fixed to the stiffening legs of said second side walls and inclined at an acute angle to said base structure, and actuating eccentric cam means mounted on said base structure extension means for rotation about axes parallel to said second side wall and contacting the under surfaces of said levers for flexing said resilient hinge to decrease the spacing of the upper edges of said side walls and bring said second side wall into a closed-mold position, said eccentric cam means being laterally adjustable toward and away from said second side wall to adjust the closed mold position thereof, and a flat heel portion formed on each of said cam means and adapted to be in contact with its associated lever when said second side wall is in closed mold-position to prevent accidental release of said cam means due to internal pressure against said second side wall.

References Cited in the file of this patent UNITED STATES PATENTS 555,345 Smallwood Feb. 25, 1896 607,214 Carroll July 12, 1898 742,019 Goodwin Oct. 20, 1903 799,493 Pfeifier Sept. 12, 1905 1,456,286 Snow May 22, 1923 1,705,201 Nagel Mar. 12, 1929 1,762,440 Howe June 10, 1930 1,849,889 Straub Mar. 15, 1932 2,306,107 Henderson Dec. 22, 1942 2,495,100 Henderson June 17, 1950 2,662,262 Wollard Dec. 15, 1953 2,771,656 Swenson Nov. 27, 1956 2,892,339 Flower June 30, 1959, 2,949,657 Anson Aug. 23, 1960 FOREIGN PATENTS 435,197 Germany Oct. 8, 1926 538,098 Great Britain July 21, 1941

Claims

1. A MOLD FOR CASTING CONCRETE STRUCTURAL ELEMENTS COMPRISING A RIGID BASE STRUCTURE, AN ELONGATED CHANNEL SHAPED MOLD MOUNTED ON SAID RIGID BASE STRUCTURE, SAID MOLD HAVING A BOTTOM WALL FORMED OF RELATIVELY FLEXIBLE SHEET METAL WITH SAID BOTTOM WALL BEING ATTACHED TO AND STIFFENED ALONG ITS LENGTH BY SAID BASE STRUCTURE, SAID MOLD HAVING A FIRST SIDE WALL MOUNTED ON SAID BASE STRUCTURE AND A SECOND SIDE WALL FORMED OF RELATIVELY FLEXIBLE SHEET METAL JOINTED TO AND UNITARY WITH SAID BOTTOM WALL, SAID RIGID BASE STRUCTURE HAVING EXTENSION MEANS PROJECTING LATERALLY PAST SAID SECOND SIDE WALL, SAID SECOND SIDE WALL BEING STIFFENED BY LONGITUDINALLY SPACED RIGID LEGS THAT EXTEND SUBSTANTIALLY FROM THE LOWER EDGE OF THE WALL TO ITS UPPER EDGE, THE JUNCTION OF SAID STIFFENED SIDE AND BOTTOM WALLS FORMING A RESILIENT HINGE, SAID HINGE NORMALLY POSITIONING SAID SECOND SIDE WALL IN AN OPEN-MOLD POSITION WHEREIN THE UPPER EDGES OF SAID WALLS HAVE A PREDETERMINED SPACING, LATERALLY PROJECTING LEVERS FIXED TO THE STIFFENING LEGS OF SAID SECOND SIDE WALL AND INCLINED AT AN ACUTE ANGLE OUTWARDLY AND UPWARDLY TO SAID BASE STRUCTURE, AND ACTUATING MEANS LOCATED BELOW SAID LEVERS AND MOUNTED ON SAID BASE STRUCTURE EXTENSION MEANS AND IN CONTACT WITH SAID LEVERS FOR FLEXING SAID RESILIENT HINGE TO DECREASE THE SPACING OF THE UPPER EDGES OF SAID SIDE WALLS AND BRING SAID SECOND SIDE WALL INTO A CLOSED-MOLD POSITION, SAID ACTUATING MEANS BEING LATERALLY ADJUSTABLE TO ADJUST THE CLOSED MOLD POSITION OF SAID SECOND SIDE WALL.