US2539917A - Form for molding precast concrete window frames - Google Patents

Description

T. L. M KINLEY FORM FOR MOLDING PRECAST CONCRETE WINDOW FRAMES Jan. 30, 1951 5 Sheets-Sheet 1 Filed April 19, 1949 Fie.4.

INVENTOR.

Tom L. MS'KINLEY,

A TTOLNEY- Jan. 30, 1951 T. L. MOKINLEY 21,539,917

FORM FOR MOLDING PRECAST CONCRETE WINDOW FRAMES Filed April 19, 1949 5 Sheets-Sheet 2 f 52 {I 3 3 5.2

Z40 a T 41 F 6 [I 23 34 E8 8 INVENTOR. THOMAS L. M K\NLEY,

LATQL A TTORNEY Jan. 30, 1951 T. L. M KINLEY FORM FOR MOLDING PRECAST CONCRETE WINDOW FRAMES Filed April 19, 1949 5 Sheets-Sheet 5 Fica.8.

6:6 "llh J INVENTOR. THOMAS L. M KINLEY FiehioQ A rrore/vEY.

Patented Jan. 30, 1951 UNITED STATES FATENT 'OFFICE FOR-M FOR MOLDING PRECAST CONCRETE WINDOW FRAMES Thoin'as L. McKinley, Miami, Fla.

Application April 19,1949, Serial No. 88,467

stop ribs for the attachment of stock size metal windows and embedded anchor bolts for the attachment of the metal frame and the conventional Venetian blind guide.

Another object or the invention resides in the novel construction of the form, having side and end channels and a two part core member-held in predetermined spaced relation to the side and end channels, together with the novel manner of removing the forms after the concrete has sufficiently hardened without danger of chipping or in any other way injurin "the cast product.

Another and novel object or the invention resides in the manner or accurately positioning anchor bolts to project into the space to be occupied by the concrete.

Another and important object of the invention resides in a sectional and collapsible concrete frame mold adapted to form "a multiple number of precast window frames by the employment of eXtended outer header and sill channels for the reception of 'a plurality -'of core members and spacers between the core 'I'n'emb'ers corresponding in cros section configuration to the jain b channels and the novel manner of retaining the ever'al parts in operative position against movement during the pouring of the concrete.

Various other important objects and advah tages of the invention will readily present themselves during thecourse or the following description, reference being had to the accompanying drawings, wherein is illustrated the preferred embodiments of the device.

Referring to the drawings:

Figure l is a plan view of an assembled form ready for pouring concrete,

Figure 2 is a side elevation thereof,

Figure 3 is an enlarged fragmentary section illustrating a manner or supporting an anchor bolt,

Figure 4 is an enlarged vertical and tore'short 2 ened section through "a concrete window frame as formedby the invention,

Figure 5 is a transverse section taken on line E 5 of Figure 2,

Figure 6 is a longitudinal section taken on line 6-43 of Figure 1,

Figure 7 is "a fragmentary perspective View of two adjacent ends of outer side and end channels,

Figure 8 is a modified form "of the invention illustrating a multiple form,

Figure 9 is a fragmentary section takenon line e e of Figure 8 and,

Figure 10 is a fragmentary transverse section through a side channel on Figure 8, with a separator member in spaced relation.

Like numerals are employed to designate like parts throughout the several figures of the drawmgs.

Referring specifically to the drawings, the numeral 5 indicatesa lower core member, as a whole, generally rectangular in shape and the numeral 5 indicates a co-acti'ng core member as a whole, adaptedto rest upon the lower member 5, in use.

The core member 6 is likewise generally rectangular in shape. The core members '5 and 9 present an open frame, the upper member li resting upon the member 5, while the member 5 is reinforced and supported upon a suitable tablahot shown, such as the well known vibrating table. The core members are formed of a suitable gauge sheet metal.

The core member 5, see particularly Figures 5 and 6, is provided with inclined side walls I, an incli'ned header wall 8 and an inclined sill wall 9. The walls 1 provide a predetermined angular wall or jamb it to the finished frame, illustrated in Figure 4, while the walls 8 and 9 provide a predetermined angular finished surface to the header it and sill l2 of the frame of Figure 4. Each of the side walls l, 8 and 9 are out turned at their lower ends to form relatively wide horizontal shelf extensions i3, of a width determined by the inner facing i i of the cast frame of Figure 4. The material is then bent downwardly on an angle of ninety degrees to form a vertical wall it, then bent "inwardly to form a horizontal wall it and then upwardly parallel with the wall l5, as at It, terminating at the first bending of the side walls, where the terminal edge is welded, 'at E8. The box-like structure formed by the walls l3, l5, l6 and it, extends entirely around the core memher 5, providing a very rigid support for the core and associated elements against downwardly flexing due to the weight of the mass of concrete poured in the form. The walls I and 8 adjacent their upper portions, are further inclined inwardly at an angle from the walls 7 and 3, as at it, for forming a bevelled face 25 on the inner surface of the frame of Figure 4. From the bevel 55, the material of the core is bent upwardly on an angle parallel with the walls I and 3 to form an annular supporting flange 2|. The wall 9, adjacent its top, is bent inwardly at an abrupt angle to form a horizontal ledge 22 and then upwardly at an angle corresponding to the angle of and parallel with the wall 9, as at 23, where it joins the flange 25 at either side, thus describing a generally rectangular frame. The ledge 22 provides a relatively abrupt shoulder 2 for the frame of Figure l, against which the conventional tile sill finish is abutted.

The flanges 2i and 23 provide a supporting rest for the upper core member 6. The core member is of generally channel shape, having a. downturned vertical flange 25, having outside dimensions that permit of a relatively close lit with the opening formed by the flanges 2i and 23. The material of the core is then pressed outwardly to form a horizontal wall section 25, that extends beyond the outer edges of the flanges 2| and 23 a distance correspondin to the required depth of abutment rib 21 for the cast window, as in Figure 4. From the wall 25, see Figure 5, the core material is bent upwardly and outwardly at an angle, as at 28, to provide bevelled side jambs for the cast window. The material of the core 5, as in Figure 6, is bent upwardly and inwardly at an angle, as at 29, to form an inward bevel 36 for the head portion of the cast window of Figure 4, as a means of preventing a flow of Water toward the metal sash.

From the wall 26 and opposite to the wall 29, the material of the core 6 is bent upwardly and outwardly at an angle, as at 3!, to provide a bevelled outer sill portion 32 for the frame of Figure 4. Each of the walls are joined at their corners, by welding into a unitary structure while the material is bent inwardly to form a horizontal top portion 33, terminating in a downwardly extending annular flange 34. The several flanges and novel bending of the side walls provides a very rigid structure against warping or twisting and will maintain its shape under most severe handling.

It becomes necessary to the installation of metal sash in precast window frames, to provide a means of attachment for the sash and, to provide for this contingency, a plurality of anchor bolts are provided, to be cast in the frame. Similar bolts are provided for attachment of the conventional guide channels for Venetian blinds. The anchor bolts, see particularly Figure 3, are preferably T--shap;d, as at 35, having a hollow screw-threaded shank 35, for the reception of form mounting screws 31. For the blind guides, the walls I are provided with equally spaced openings 38 for the passage of the screws 37, and for the sash attaching anchors, the flanges 2!, 23 and 25 are aligned drilled for the passage of the screws 37. In use, the anchor bolts 35 are positioned over the openings and securely held by the screws 37, as clearly shown in Figures 3, 5 and 6, with the bolts extending into the opening for the reception of the concrete. The screws 31 employed in mounting the anchor bolts for the sash, serve, not only to support the bolts, but further serve to prevent displacement of the upper core member 6 from its position of rest upon the lower core member 5.

. 42 and 33, having inner walls parallel with the wall 40 and 4| and connected with the walls 40 and 4! by angle walls 44 and 45. The ribs, in use, provide channels around the entire frame, as at it, in Figure 4. The purpose of the channels in the frame is to provide interlocking mortar joints between the frame and the main walls of the building. Each wall 40 and M, at its upper edge, is bent outwardly to form a horizontal wall 41, that has its terminal edge bent downwardly to form a vertical flange 48. The lower portion of each wall 46 and ll is turned inwardly to form horizontal walls 49 and 59, adapted to rest, in use, upon the walls I3. The width of the walls 45} and 53 corresponds to the upper width of the walls l3 and in use, with the side forms resting upon the walls IS, the walls 50 and 4| lie flush with the walls l5, thus placing the entire weight of the concrete mass upon the box-like structure defined by the walls l3, l5, l6 and IT. A plurality of shortplates 5| are welded to the plates 55 and project upward beyond the walls l3 to serve as a means of preventing distortion outwardly of the side forms under the pressure of the concrete. Each end form member is cut away for the width of its rib at each end to permit snug engagement with the corresponding rib of the side forms. Each end member is provided with hook bolts 52 adapted to engage in openings 53 formed in the horizontal walls 41 of the side forms.

In use, the core member 5 is placed in position upon a suitable table, such as a vibrator, with its box-like base resting firmly and evenly thereon. The anchor bolts for the blind guides are then placed in position. The upper core memher 6 is then placed upon the flange 2| and the anchor bolts for the sash assembled. The outer forms 38 and 39 are then placed in position, with their lower walls 49 and 50 resting upon the walls l3 and held against spreading by the plates 5|. The placin of the side forms in position, causes the hook bolts to engage in their respective openings 53, thus securely locking the upper corners of the outer forms together. Concrete, of a suitable mix is then poured into the form and the whole vibrated to produce a dense mass. After suflicient time has elapsed to permit hardening, the upper core member 6 is released, by first removing the screws 31, after which it mav be easily lifted from its position. The screws 3'! for the blind guide anchors are likew se removed and the unit is ready for removal from the core 5 and the removal of the side forms.

It is essential, that means be provided to give an initial lifting of the cast frame and its side forms, in order to release the side forms from their retaining plates 5! and to permit disenga ement of the hook bo ts 52. To assist in this lifting, levers 5 3, hin ed upon cross pins 55 are mounted in the boxing of the lower core member 5, to swing in a, vertical plane. These levers are preferablv mounted, one at each corner of the boxing and project outwardly of the boxing, where they are provided with foot engaging ends 56, for engagement by the foot of the operator.

5, The inner ends of the levers are curved and terminate in a vertical rod that projects through openings formed in the wall it for engagement with the underside of the walls 45 and 59-. Pres sure upon the foot engaging ends 56, causes the rods 5? to raise the outer form su-fliciently far, carrying with it the cast frame, to permit the outer forms to be moved outwardly from their engagement with the plates 51. After the side. forms have thus been released, they may be disengaged with each other and the cast frame is now ready for removal from the lower core to a place of curing. since the anchor bolts are embedded in the cast frame, they will be ready at all times for the assembly of the sash and the blind guides. The device is now ready for cleaning and reuse. The boX-iike support for the lower core presents a very rigid base that supports the entire weight of the forms and the mass of concrete poured therein and permits of the forms being supported on a structure other than a flat table, without warping or twisting, while the plates 5i and the hook bolts prevent side expansion of the outer forms. The inclined wails l, 8 and 9 permit ready and unobstructed removal of the cast frame from the core 5.

Figures 8, 9 and 10 illustrate a multiple form, employing identical core forms 5 and 5. Outer lamb forms 36, identical with the forms 38 are employed at each end of the structure. the form as a whole is extended in length to accommodate a plurality of core members, it follows, that the header and sill outer forms $9 must of necessity be of greater length. In all other respects, the forms 39' are identical as to cross sectional shape. The outer forms 38 and 39 are held at their corners by the same hook bolts 52, while the same retaining plates 5! are employed to prevent spreading of the forms. In using this form of the invention, the core members are assembled and placed side to side in abutting relation, see Figure 9. The jamb for is 33' are then placed in position upon their re spective plates it. Since it is not practicable to employ the jamb forms 33 between the respec tive core assemblies, spacer forms 58 are employed. These spacer forms extend the entire width between the forms 39 and are likewise cut away at 59 to engage over the ribs 43' of the forms 39. Hook bolts to, welded to the upper edges of the spacers 58, project outwardly and are adapted, at assembly to engage in openings 5i, formed in the forms 39'. Each spacer has a duplicate face, and comprises a double ribbed wall (52, corresponding to the ribs formed on the outer forms 38' and 39'. Lower horizontal extensions 53, project outwardly to compl tely overlie the walls It.

After the lamb forms til have been placed in position, as before stated, the spacers are arranged in a corresponding manner and the forms 39 are then positioned upon their respective plates it, behind the plates 5| and the several hook bolts connected in their respective openings. The form is now ready for pouring. will be apparent, that the hook bolts 65.! will prevent any spreading of the side forms 39. In other respects, the form is rigidly held against warping or twisting under the weight of the concrete mass. shown in this latter form of the invention, may obviously be employed, if desired.

It will be apparent from the foregoing, that an exceptionally novel and highly rigid form has been provided for the casting of concrete window ince The lifting levers 54, while not frames or the like. The construction permits of a quick and easy assembly of the several parts anda removal of the finished product with a. minimum of effort. The forms are constructed: in a simple manner calculated to give the proper and desirable contour to the frame, yet will read-. ily disengage themselves from the cast frame without injury thereto. The device is very strong, relatively cheap to manufacture and ishighly eflicient in use, resulting in the produc tion of a considerably larger number of frames in a given time.

It is to be understood, that the invention is not limited to the precise structural details shown, but that it includes within its purview, whatever changes fairly come within either the terms or the spirit of the app-ended claims.

Having described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A sheet metal concrete form comprising a generally rectangular lower core member open at top and bottom and having inwardly inclined side and end walls and an annular angular flange ofiset inwardly from the side walls, said core having its lower portion bent outwardly to form an annular horizontal supporting base, said base bent to box-like shape for rigid support of the core, a co-acting upper core member of sheet metal formed rectangular in shape and open at top and bottom, said upper core member provided with a depending flange adapted to be positioned within the flange of the lower core member, said upper core member overlying the upper end of the lower core member and having inclined side and end walls, outer spaced side and end forms cooperating with the core members and having vertical walls pressed inwardly throughout their length to form mortar grooves in the concrete, said outer forms being of a height corresponding to the joint height of the cores, said outer forms having their lower ends bent in wardly to form horizontal support plates of a width corresponding to the base, hook bolts for connecting the outer forms at their corners and retaining plates carried by the base to prevent lateral movement of the outer forms.

2. A concrete form of sheet metal comprising a lower core member and a upper core member superimposed thereon, the lower core member having side and end walls having their lower ends bent to form a box-like base having a horizontal supporting surface projecting beyond the walls throughout its circumference, the side walls of the lower core adjacent their tops being bent inwardly at an abrupt angle and terminating in an inwardly offset flange parallel with the side walls, one end wall bent inwardly adjacent its top at approximately a right angle and then bent upward to correspond to the flange, the said cores open at top and bottom, said upper core corresponding in shape to the lower core and having a flat top and a depending flange adapted to engage within the flange area of the lower core, said upper core having two side and one end wall inclined outwardly and one end wall inclined inwardly, said upper core open at top and bottom, said flanges overlapping and provided with aligned openings, screw devices passing through the openings, side and end forms adapted to cooperate with the cores and comprising vertical walls having a horizontal wall bent therefrom at their lower ends of a width corresponding to the width of the supporting surface of the base, the upper longitudinal edges of the forms bent to channel form outwardly, said form Walls pressed inwardly throughout their length to form longitudinally extending ribs, the ribs of the ends and sides being in registry, hook bolts for locking the corners of the outer forms together, stop plates carried by the base and projecting upwardly above the base for overlying the lower ends of the outer forms and a plurality of lifting devices carried by the base for engagement with the horizontal walls of the side forms.

3. A form for molding precast window frames comprising a core and outer side forms, said core and said forms made of sheet metal, said core formed in two parts and separable, said core being of generally rectangular shape in top plan and having flat inwardly inclined side wall terminating at their lower ends in box-like bases extending entirely around the core and projecting outwardly therefrom with a flat horizontal top, the outer side forms having vertical side wall pressed inwardly throughout their length to form ribs, certain of the outer form side wall cut away to fit the rib of its adjacent side wall, hook bolts carried by certain of the side forms, with other of the side forms being provided with openings for the reception of the hook bolts, the side forms having their lower ends bent inwardly at a right angle to form horizontal support plates, said plates being of a width corresponding to and adapted to be supported upon the flat top of the base, stop plates welded to the base and overlying the lower portions of the side forms and lifting devices carried by the base for engagement with the support plates, said form being demountable from a casting therein.

4. A form for precast concrete window frames comprising a lower rectangular core open at top and bottom and an upper core rectangular in shape to be superimposed on the lower core, the lower core having inwardly inclined side walls terminating at their lower ends in a box-like l reinforced base extending entirely around the core and having a fiat horizontal supporting face extending beyond the core, the said walls terminating at their upper ends in an inwardly offset fiange parallel with the side walls, said upper core having inclined side walls terminating in depending flange adapted to engage within the flange of the lower core, said flanges provided with aligned openings for the reception of screw devices, the upper portion of the upper core bent inwardly and downwardly to channel form having a flat top, separable side forms spaced from the cores and provided with horizontal supporting plates to be supported upon the base, upstanding vertical side walls carried by the plates and having their upper edges bent outwardly and downwardly to form a flat surfaced channel top, the vertical side walls throughout their length being pressed inwardly to form wide ribs spaced intermediate the height of the walls, the ribs of two side forms being cut away to engage over the ribs of the adjacent form, hook bolts carried by certain of the forms for engaging in openings formed in the adjacent forms, stop plates carried by the base to partially overlie the vertical walls of the side forms, lifting levers pivotally supported in the base and projecting outwardly thereof, foot pedals carried by the levers, lifting rods formed on the levers and adapted to project through openings formed in the supporting face and anchor bolts supported outwardly of the inclined walls of the lower core adjacent the lower ends.

5. A form for the multiple casting of concrete window frames comprising a plurality of two part demountable core members superimposed one upon the other, said core members provided with an extended reinforced base entirely around each one and adapted to be arranged side by side with their adjacent bases in abutting relation, a pair of outer side forms spaced from the outermost cores and provided with lower foot extensions wholly supported upon the adjacent bases, a pair of outer spaced elongated end forms extending between the side forms and provided with lower foot extensions wholly supported on the bases of the plurality of cores, means for locking the corners of the outer forms together, means carried by the several bases to prevent displacement of the foot extensions therefrom, wide ribs formed upon the side forms and projecting inwardly toward the cores, spacer forms positioned between the abutting cores and extending from one end form to the other, hook bolts carried by the spacers for engagement within openings formed in the end forms, said spacers provided with oppositely extending wide ribs throughout their lengths corresponding to the ribs of the outer forms and co-extensive therewith, the ends of the spacers being cut away to engage ove the ribs of the end forms, the oppositely extending ribs of the spacer forms being an equal distance from the cores as the side form ribs, foot extensions carried by the spacer forms upon opposite sides for completely overlying the adjacent bases of the cores and wholly supported on the bases, each side of the spacer forms being identical in size and cross-sectional area to the side and end outer forms.

THOMAS L. McKINLEY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 877,874 Tsanoff Jan. 28, 1908 1,051,568 Emtman Jan. 28, 1913 1,479,298 Hatch Jan. 1, 1924 1,569,513 McClain et a1. Jan.12 1926 2,228,123 McMurray Jan. 7, 1941

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