US2709291A - Molds for use in building walls - Google Patents

Description

y 3 1955 J. M. H-ARKNESS arm. 2,709,291

MOULDS FOR USE IN BUILDING WALLS 4 Sheets-Sheet 1 Filed Feb 9, 195g Inventor I z Maxims-s Attorney Joy/v MIN/ELI. I /fiAK/VESS 640066 Kerri;

By Mu I 7 O 1 mwv. 1 9 I I6 n9 3 F n J .9 P v. 3/ I 3 3 7 v r l w May 31, 1955 J M. HARKNESS ETM. 2,709,291

. noun-0s FOR USE IN BUILDING WALLS 4 Sheets-Sheet 2 Filed Feb. 9, 1950 May 31, 1955 J, M. HARKNESS ETAL MOULDS FOR USE IN BUILDING WALLS Filed Fb. 9, 1950 I37 I FIG. 3. /03 //3 24 4 Shee'ts-Sheet 3 6508476 6221 wen law! By M Attorney y 31, 1955 J. M. HARKNESS EI'AL 2,709,291

MOULDS FOR USE IN BUILDING WALLS Filed Feb. 9, 1950 v 4 Sheets-Sheet 4 s aw-4 1 Attorney MOLDS FOR USE EN BUILDING WALLS John Maxwell Harkness, Eltharn, London, and George Kettelwell Harkness, Bexley, England Application February 9, 1950, Serial No. 143,306

Claims priority, application Great Britain March 22, 1945 Claims. (Cl. --131) This application is a continuation-in-part of our United States application Ser. No. 653,830, filed March 12, 1946, of British application 7,289/45, filed March 22, 1945 (now British Patent 594,897), and of our prior United States application Ser. No. 10,238, filed February 24, 1948, claiming priority of British application 16,811/46, filed lune 3, 1946 (now British Patent 612,871) under Public Law 68 Stat. 940, approved August 8, 1946.

This invention relates to moulds for use in the construction of walls which are formed in situ in successive sections, the mould after being used to form one section being removed and placed in position to form the next adjoining section. It is an object of this invention to provide an improved mould for use in the construction of such walls, which latter may be formed of concrete or of any other suitable material which can be moulded and which will then set so as to have a suflicient degree of hardness and strength. All such materials are to be considered as being comprised within the term concrete which will he used hereinafter for the sake of convenience.

A more particular object of the invention is the provision of such a mould which is designed for use in the construction of hollow or cavity walls and one which offers advantages over known forms of mould.

It is a further object of this invention to provide a mould comprising a frame structure a core and a pair of side mould plates which are movably carried by said frame structure for movement between an inner moulding position and an outer position to permit of the mould being readily removed from a moulded section of wall without damaging the latter while the concrete or other material is still soft.

Yet another object of the invention is the provision of such a mould wherein novel means are provided whereby the core is rigidly supported in the correct position-in the mould.

Another object of the invention is the provision of such a mould wherein the core and the frame structure are so constructed that the mould with the core can readily be removed from a formed section of wall without the core tending to stick in or to damage the wall section and without involving the use of an expandable core which is, of necessity, complicated and expensive to construct.

A still further object of the invention is the provision of such mould which may be provided with a core of angular shape such that the mould may be used for forming a corner of the wall or a wall junction without interrupting the central cavity of the wall.

With the above end in View it is one of the specific objects of this invention to provide a mould for use in forming a corner section of a cavity wall wherein the said mould includes a core having a longitudinal section extending to one end of the mould and a transverse section extending to one side of the mould, means being provided for closing the other of the ends of the mould ice to form the return portion of the outer side of the wall.

It is a further object of the invention to provide a mould which is adapted to be used for the construction of walls which meet at a T junction and to this end it is yet another object of the invention to provide a mould having a core of T-shape to form the central cavity in a section of Wall at such a junction.

A still further object of the invention is the provision of two forms of mould having T-shaped cores which are differently formed such that by using the two moulds alternately for the construction of successive courses the joints between the sections in the courses may be staggered or broken with respect to each other.

Another object of this invention is the provision of a mould having one or more end plates by means of which one or both of the ends of the mould may be closed, either completely or on one side only of the core, if required.

A further object of the invention is the provision of such a mould having improved means for securing the end plates in position, which means are simple and rapid to operate, both when fitting the end plates and when removing the latter from the mould, and are not liable to have their operation obstructed by concrete, dirt, or the like.

A still further object of the invention is the provision of a mould having means for positively positioning the side plates in their inner moulding positions and for eliminating any tendency for the side plates to move away from these positions during the filling of the mould with concrete and the tamping of the latter to consolidate it.

The above and other objects and advantages of the invention will be more fully explained in the following description, taken in conjunction with the accompanying drawings. These drawings show a number of embodiments of the invention.

In the drawings:

Figure l is a perspective view of a mould constructed in accordance with the invention which is intended to be used for constructing a straight section of a cavity wall, such as an outer wall of a house;

Figure 2 is a side elevational view of the mould shown in Figure 1;

Figure 3 is a plan view of the mould of Figures 1 and 2;

Figure 4 is a section taken on the line IViV of Figure 2;

Figure 5 is a detail horizontal section taken on the line VV of Figure 2;

Figure 6 is a perspective view showing a modified form of mould which is designed to be used where two walls meet in the form of a T, such as at the junction of a party or dividing wall with an outer wall;

Figure 7 is a perspective view showing another form of mould which is intended to be used at a T junction alternately with the mould of Figure 6 in order to obtain a staggering of the joints between the wall sections in successive courses of the walls;

Figure 8 is a plan view of the core of the mould shown in Figure 7;

Figure 9 is a detail sectional view showing part of the mould and core of Figures 7 and 8;

Figure 10 is a perspective view of another form of mould which is intended for use in the construction of wall corners, such as at the outer corners of a house;

Figure 11 is a detail sectional view showing a modification.

Referring to the drawing and more particularly to Figures 1 to 5 the mould shown comprises a frame structure consisting of two end frames 1101 which are attached to each other in parallel, spaced-apart relationship by means of two pairs of longitudinal bars 102. The ends of these bars are threaded and they are attached to the end frames 101 by means of nuts 103.

Each end frame 101 is of inverted U-shape having two outer side legs 104 which depend from the ends of an upper cross-bar 105, and an intermediate leg 106 which depends from the bar 105 between the legs 104. The bars 102 are connected to the legs 104.

The mould is provided with two side mould plates 107 which form the outer side surfaces of the wall section. Each of these side plates 107 is movably mounted in the frame structure, being carried on two pairs of swinging arms 108. These arms are pivotally connected at their inner ends to lugs 109 which are mounted on or, preferably, formed integrally with the side plates 107.

At their outer ends the arms 108 are rigidly attached to tubes 110 which are rotatably mounted on the longitudinal bars 102. It will thus be seen that the side plates 107 can be moved from their inner moulding position which is best shown in Figure 5, upwardly and outwardly to a position in which they are clear of the moulded section of wall. This enables the mould to be removed from the wall section easily without damaging the concrete while the latter is still soft.

The above construction in which the arms 103 are rigidly secured to the tubes 110 offers important advantages in that the side plates 107 are effectively controlled during their movement and are accurately positioned in their inner moulding positions without risk of any angular tilting such as might occur if independentlymounted or loosely connected arms were used for supporting the side plates. The tubes 110 provide very rigid connections between the arms 108. During the movement of the plates 107 they are always maintained substantially parallel to the central longitudinal plane of the mould.

It will be noted that the ends of the side plates 107 project beyond the end frames 101. The reasons for and the advantages of this arrangement will be explained in due course.

In order to limit the downward movement of the side plates 107 and thus to define the inner moulding positions thereof, each plate 107 is provided at one, or preferably, both ends with a projecting tooth 112 which is adapted to engage a lug 113 provided on the end frame 101 when the side plate is in its moulding position. In this position the arms 103 are horizontal so that the internal pressure of the concrete in the mould does not produce any direct force on the plates 107 tending to move them away from the moulding position.

It has been found, however, that during the filling of the mould and the tamping of the concrete there is a risk of the side plates 107 working upwardly away from their moulding position. members 114 may be provided for retaining the plates 107 in their moulding positions. Such locking members may be provided at one or both ends of the plates 107.

It will be noted that in the drawings only one of the side plates 107 has been shown as being provided with a locking member.

Each locking member 114 is pivotally mounted on a side arm 104 of one of the end frames 101 by means of a bolt or stud 115. The locking member 114 is formed with a V-shaped cutout 116 (Figure 4), the upper surface 117 of which is adapted to engage the upper surface 118 of the tooth 112 in order to prevent any upward movement of the side plate 107 until after the locking member 114 has been released. The surface 117 of the member 114 is preferably so shaped as to provide a camming or wedging engagement with the surface 118 of the tooth 112.

In order to avoid this, locking.

aspects of this invention, to provide means for causing the members 114 automatically to engage the teeth 112 to lock the side plates 107 when the latter are moved to their moulding position. For this purpose each locking member 114 may be acted upon by a leaf spring 119 the lower end of which is attached by means of a rivet or screw 120 to a stud 121 provided on the end frame. As the side plate 107 is moved downwardly to its moulding position the locking member 114 is forced outwardly by the engagement of the end of the tooth 112 against the face 122 of the locking member. 112 reaches the recess 116 the member 117 automatically locks the tooth against upward movement.

To release the side plates 107 the locking members 114 are disengaged from the teeth 112.

In order to facilitate the raising of the side plates 107 and the lifting of the mould from a formed section of till While it would be possible to operate the locking smooth and continuous surfaces.

wall, each plate 107 is provided with a handle 124. To lift the mould from a formed section of wall the workman, after releasing the locking members 114, grasps the handles 124 and raises them. This has the effect, firstly of moving the side plates 107 upwardly and outwardly away from their moulding position and then of lifting the mould bodily.

in the construction of Figures 1 to 5 the mould is provided with a central straight core 126 the purpose of which is to form a longitudinal cavity in a straight length of wall. This core is mounted on end supported by the intermediate legs 106 of the end frames 101 in manner which will be described.

The core 126 comprises two side panels 127 and a top plate 128. Its lower end may, if desired, be closed by means of a bottom plate (not shown) which may be secured in position by welding or other means. The ends of the core may be open since they fit against the legs 106.

The ends of the side panels 127 of the core extend beyond the ends of the top plate 128 so that they project past the sides of the legs 106, and beyond the outer faces of the end plates 101, by the same amount as do the side mould plates 107. This construction of the core 126 provides an accurate and secure positioning of the core with respect to the end frames 101 and ensures that the sides of the core have smooth and continuous moulding surfaces for the full ettective length of the core. Furthermore, the projection of the side panels 127 of the core and of the side mould plates 107 beyond the end frames 101 offer important practical advantages in use. In the first place it makes it possible for the mould to be easily positioned against the end of the last-formed section of wall with the projecting ends of the side plates 107 and of the side panels 127 of the core overlapping the previous section of the wall by the necessary small amount to ensure that the mould is correctly positioned and that the wall will be formed with the necessary Without an overlap there would be irregularities at the joints between the sections, While there would be a risk of concrete escaping from the mould and falling into the wall cavity.

A further advantage of the above construction of core is that it enables the mould to be used for building a wall the end of which abuts against the side of an existing Wall. This could not be done satisfactorily if the ends of the side plates 107 and of the side panels 127 of the core did not project, since they would be prevented from abutting against the surface of the existing wall by reason of the various projections (such as the ends of the rods 102 and the nuts 103) which exist on the outer sides of the end frames 101. Even if the end frame were made perfectly flat and free from projections, it would often be difiicult to fit a flat end plate sufficiently closely against an existing wall owing to irregularities on the surface of the latter.

Each of the intermediate legs 106 is formed or pro vided on its inner surface with two projecting lugs 130 and 131 (Figure 4) which provide additional means When the tooth for the attachment of the core 126 to the legs. The lugs 130 are so positioned that the top plate 123 of the core rests on them. Thus the core 126 is positively held in its correct position by the engagement of the top plate 128 on the lugs 130 and against the inner faces of the legs 106 and by the sides 127 of the core engaging on opposite sides of the legs 106. For further security, however, additional means may be provided for connecting the core to the legs 106, such as screws 132 passed through the side panels of the core into the lugs 130 and 131.

As is best shown in Figure 4 both the core 126 and the legs 106 are downwardly tapered so as to be narrower at the bottom than at the top. This greatly facilitates the removal of the mould without damaging the newlyformed secion of wall and avoids any need for using an expanding core. The reason for this is that as soon as the mould and core are raised the sides of the core separate from the concrete of the wall section.

It will also be noted that the engagement of the ends of the side panels 127 against the tapering sides of the legs 106 prevent the core from moving upwardly in the mould, apart from the attachment provided by the screws 132.

When forming the first section in a course of the wall it is necessary that both ends of the mould should be closed, while when forming further sections means must be provided for closing one end of the mould, the other end thereof being fitted to the end of the previously formed section. It is accordingly one of the objects of this invention to provide a mould having one or more removable end plates of novel and improved form.

The mould of Figures 1 to 5 is shown as having one of its ends closed by means of a single end plate 135, while its other end is closed by means of two separate end plates 136 which are fitted on opposite sides of the core 126. The construction and attachment of these end plates will now be described and in this connection reference should also be had to Figure which shows the outer sides of an end frame 401 and of an end plate 435 which are precisely similar to the frame 151 and end plate 135.

For the attachment of the end plates 135 or 136 (Figures 1 to 5 or 435 (Figure 10) the lower ends of the legs 104 and 106 (Figures 1 to S) and 404 and 406 (Figure 10) are formed with external ribs 137 and 437 to which lip members 139 and 439 are attached by any suitable means such as by screws 141 and 441, the object of this being to provide channels 143 and 443 for the reception of locating members (to be referred to hereinafter) which are provided on the lower ends of the end plates. If desired, the separate members 133 and 439 could be replaced by lips formed integrally with the ribs 137 and 437.

Since the end plates 135 and 435 are identical the construction and mounting of the end plate 135 only will be described, reference being made to the Figure 10 only when necessary to illustrate the details of the construction of the plates.

The end plate 135 consists of an upper part 145 from which two plate sections 146 depend. The inner faces of the sections 146 are inset with respect to the inner face of the part 145 so that when the part 145 is fitted to the outer face of the end frame 101 the inner faces of the sections 146 are flush with the inner face of the end frame. This affords advantages when the end plate 135 is used with a mould having a core of a different shape, such as will be referred to hereinafter.

The sections 146 of the end plate 135 may be provided on their inner faces with ribs 147 to form keys or recesses in the wall sections, whereby the bonding between successive sections of the wall is improved.

The sections 146 of the plate 135 are provided along their lower edges with projecting flanges 148 (which are similar to the flanges 448 of Figure 10). In the construction shown in the drawings the aforesaid locating members take the form of pins 149 and 150 which are cast into the flanges 148, but, if desired, these pins may be formed integrally with the flanges. It will be noted that the central pin 150 extends between the two flanges 148 and thus provides a connection between the lower ends of the sections 146 of the end plate.

In order to locate the end plate accurately with respect to the end frame 101 the latter is formed with two apertures or sockets 151 which are adapted to be engaged by studs 152 projecting from the part of the plate 135. These studs 152 prevent the end plate 135 from moving upwardly until after its upper end has been moved outwardly away from the end frame 101.

To prevent this outward movement and thus to secure the plate 135 to the end frame, the plate 135 is provided with a locking member 153. This locking member consists of a metal plate which is slidably mounted on the part 145 of the end plate 135. For this purpose the part 145 is provided with apair of projecting studs 154 (corresponding to the studs 454 of Figure 10) which pass through a vertical slot formed in the locking plate 153 and which carry, at their outer ends, a retaining plate 156. The bottom edge of the locking plate 153 is rolled outwardly around a small metal bar to provide a handle 157 by means of which the locking plate can easily be operated.

To release the end plate 135 it is merely necessary to raise the locking plate 153 by means of the handles 157 in order to disengage the upper lip 158 of the locking plate from the top of the end frame 101. The plate 135 can then be moved outwardly to disengage the studs 152 from the sockets 151, after which it is lifted to disengage the pins 149 and from the channels 143.

in certain cases, such as when starting a course of wall from the frame of a window, door or the like, it may be desired to close one side of the mould only and to leave the other open in order that the concrete may bond directly with the frame. For this purpose two half mould plates 136 may be provided for closing an end of the mould. These two half plates 136 are, in effect, the two halves of a single plate such as 135, with the exception that the cross part 145 is replaced by two sep arate top parts 160, while the central pin 150 is divided so that each plate 136 has a pair of pins 161 projecting from the opposite ends of its bottom flange 162.

Each of the top parts is provided with a stud corresponding to one of the studs 152 and has its own locking plate 163 which is narrower than, but otherwise similar to, the locking plate 153.

It will thus be seen that an end of the mould may be completely closed by fitting the two half plates 136, or one side only of the mould may be closed by fitting one of these plates.

Figure 6 shows a mould the frame structure (including the end frames 201) and side plates 207 of which are identical with those of the mould shown in Figures 1 to 5. Furthermore, the mould is shown with one of its ends closed by means of a single end plate 235 (similar to the plate 135) and with its other end closed by two half plates 236 which are similar to the half plates 136.

The mould of Figure 6 is, however, provided with a core 201 which differs from the core 126 in that it is of T-shape for use at a T junction, such as occurs when a dividing or party wall meets the outer wall of a house.

The core 226 thus comprises a longitudinal section 270, the ends of which are constructed in a similar manner to the ends of the core 126 and are attached to the intermediate legs 206 of the end frames 201 in the manner already described with reference to Figures 1 to 5. At an intermediate portion of its length, such as at its mid-point, the core 226 also includes a transverse portion 271, the length of which is such that when the corresponding side plate 207 is in its inner moulding position it fits closely against the end of the section 271 of the core. Thus when a section of wall is formed in the mould the section 271 will form a lateral extension of the central wall cavity which will ensure that when a party or dividing wall is constructed opposite this extension of the cavity, using the mould of Figures 1 to 5, there will be a continuous cavity formed extending from one portion of the wall into the other.

The longitudinal section 270 of the core 226 is tapered downwardly in a similar manner to the core 126, while the section 271 is also formed with a similar downward taper. This ensures that the mould and core can easily be raised clear of the formed section of wall.

Figures 7 to 9 show yet another form of mould which is intended to be used in conjunction with the mould of Figure 6 when forming a T junction in a wall.

The mould of Figures 7 to 9 comprises a frame structure consisting of two end frames 301 and 375 which are connected together by longitudinal bars 302 in a similar manner to the end frames 101 and 201 of the moulds already described.

The end frame 301 is similar to the end frame 101 in all respects and comprises outer legs 304 and a central leg 306. The end frame 375, however, is providedwith outer side legs 376 only, the central leg being omitted in the construction shown.

The mould also comprises side plates 307 which are generally similar to the plates 107 and which are mounted on the bars 302 in a like manner by means of swinging arms 308 which are secured to tubes 310 rotatably mounted on the bars 302. The downward movement of the side plates 307 is limited by the engagement of projecting teeth 312 provided on the plates 307 against studs 313 provided on the end frames 301 and 375, while locking members 314, similar to the members 114, may be provided for preventing the side plates from working up during the filling of the mould.

The mould is provided with a core 326, which in this construction is of T-shape differing from that of Figure 6. The core 376 comprises a longitudinal section 377 which is joined with a transverse section 378. The length of this latter section corresponds to the width of the mould when the side plates are closed.

The free end of the longitudinal section 377 is constructed in a similar manner to the ends of the core 126 and it is attached to the leg 306 in the same way. With the present construction, however, it is necessary to provide other means for supporting the other end of the core 326, for which purpose the ends of the transverse section 378 are provided with projecting arms 379 which pass through vertical slots 380 formed in the side plates 307 and which are secured at their outer ends to vertical support members 381. These members: 381 are forked at their upper and lower ends and fit between the tubes 310 on the bars 302. In this way the transverse section 378 of the core 326 is supported at its opposite ends while the length of the slots 380 allows of the movement of the side plates 307.

The sections 377 and 378 of the core 326 are downwardly tapered to facilitate the removal of the mould.

As shown in Figure 7 the end of the mould occupied by the frame 375 is closed by means of a single end plate 383 the lower portion of which is continuous across the full width of the mould. Apart from this fact and from thefact that the end plate is not provided with any ribs corresponding to the ribs 147, the plate 383 is generally similar to the plate 135 and it is attached to the end frame in a like manner.

It would be possible to replace the end frame 375 with a three-legged frame similar to the frame 101 or 301 and to use an end plate similar to the plate 135, except for the omission of the ribs 147, since the construction of the end plate 135 is, as has been described, such that the inner faces of the sections 146 are coplanar with the inner faces of the end frame 101. Consequently a smooth continuous outer surface would be given to the wall.

When constructing a T junction in a wall one course is formed using the mould of Figure 6 in the manner already described, while in forming the second course the mould of Figures 7 to 9 is used. Owing to the fact that the section 377 of the core 326 is of greater length than the section 277 of the core 226 the joints between the sections of the party or dividing wall will be staggered in successive courses, as also will be the joints between the sections in the outer wall, since the section 3780f the core 326 is shorter than the section 270 of the core 226. It will be appreciated that the distance between the transverse section 378 of the core 326 and the inner face of the end plate 383 is equal to the distance between the face of the core section 270 and the corresponding side plate 207. In other words it corresponds to the thickness of the outer side or leaf of the wall.

Figure 10 of the drawing shows yet another form of mould which is intended for use in the construction of corners.

The frame structure of this mould is similar to that of the mould shown in Figures 7 to 9 and comprises one end frame 401, having outer legs 404 and an intermediate 406, and a second end frame 475 which is provided with outer legs 476 but with no central leg. In this case the mould is shown as having one of its ends closed by means of an unbroken end plate 483 which is similar to the end plate 383, while its other end is closed by means of double end plate 435 which is similar to the plate of Figure l and many of the constructional features of i which have already been described.

The end frames 461 and 475 are connected together by means of longitudinal bars 402 and the mould is provided with side plates 407. These latter are mounted in the frame structure in the same manner as the side plates of the other moulds and may be provided with locking members similar to the members 114.

In the construction of Figure 10 the mould is provided with a core 426 which is of L-shape, comprising a longitudinal section 485 corresponding to the section 377 of the core 326 of Figure 7, and with a transverse section 486 corresponding to one half of the core section 378. Both sections of the core 426 are downwardly tapered as in the other constructions.

The end of the section 485 is connected with the leg 406 in the manner described with reference to Figures 1 to 5 while the end of the core section 486 is supported in the same way as one of the ends of the transverse section 378 of the core 326. That is the core section 486 is provided with a projecting arm which passes through a slot formed in one of the side plates 407 and which is attached to a support member 481 (corresponding to the member 381) which is fitted between the tubes 410 of the longitudinal bars 402. Thus the core 426 is supported at both its ends.

The use of the mould of Figure 10 will be clear frdfn the preceding description.

In order to cover right and left handed corners and also to enable the joints in successive courses to be staggered, it is preferred to provide two corner moulds one having a left-handed core as shown in Figure 10 and the other having a right-handed core. Owing to the fact that the sections 485 and 486 of the cores are of different lengths, if a mould having a left-handed core is used for forming the corner section in one course and if a mould having a right-handed core is used for forming the corner section in the next course, then the joints between the sections of the wall will be staggered between the successive courses.

The moulds which have been described are intended to be supported in part by the core resting on wall ties fitted on the previous course and extending across the wall cavity. It would, however, be possible to provide According to the modification shown in Figure 11,

which is applicable to any of the forms of mould which have been described, the side plates (one of which is indicated in Figure 11 at 507) may be provided with projections or fillets 590 extending along their inner faces just above the lower edges 591 of the side plates.

These fillets are triangular in section having their lower faces 592 perpendicular to the side plates 507, while their inner faces 593 are inclined at an acute angle to the face of the side plates.

The horizontal lower faces 592 of the fillets are intended to rest on the edges of the previous course so as to support the mould, while the inclined faces 593 of the fillets ensure that little or no disfigurement of the finished wall is caused by the shallow grooves which the fillets leave in the wall. In fact these grooves often enhance the appearance of the wall, while if the wall is to be plastered they serve to provide a key for the plaster.

The fillets 590 may extend for the full length of the side plates or they may be shorter than the latter, being provided only near the ends of the plates.

It will be apparent that the invention provides a mould which is of simple and robust construction and one which is rapid and efficient in use. The mould can easily be constructed of standardised parts and it if an important feature of this invention that the majority of the parts used are the same in more than one form of mould. This reduces the cost of production. If necessary also one form of mould could be converted into one or another form. Thus, if necessary the core 126 of Figure 1 could be removed and replaced by the core 226 of Figure 2.

The moulds of the invention could be constructed of any suitable material but it is preferred to construct the end frames, the side plates and also the end plates out of cast aluminium alloy. Alternatively, they could be formed of sheet steel or of other sheet metal.

While we have described various preferred embodiments of the invention it is to be understood that these are given by way of example only and the invention is not limited to these particular embodiments. Various modifications are possible without departing from the scope of the invention as set forth in the appended claims.

We claim:

1. A mould for use in the construction of cavity walls which are cast in situ in successive sections comprising a pair of end frames and longitudinal frame members connecting said end frames together into a self-supporting frame structure, a pair of spaced side mould plates movably carried by said frame structure for movement from an inner moulding position to an outer position, a core carried by said frame structure for forming a mould cavity in the desired wall and at least one end plate carried by said frame structure for closing at least one end of said mould cavity, each of said end frames including an upper cross member and a pair of outer legs depending therefrom and an intermediate depending leg located between said outer legs, said core including a pair of side panels which extend beyond the intermediate leg of at least one of said end frames so as to project externally off said one end frame, said core also including a transverse core section extending toward at least one of said mould plates, at least said one mould plate having a positioning slot, said transverse core section having positioning means for holding it in a desired position in said mold cavity including at least one arm member extending from said core section and engaging said positioning slot and connected to at least one of said longitudinal frame members.

2. A mould as claimed in claim 1, said core including its said transverse cross section constituting a T-shaped core for forming a T junction between two walls, said transverse core section extending from the end of a longitudinal section of the core towards both side mould plates, each mould plate having a positioning slot and each at the opposite ends of said transverse core section having at least one arm member extending from said transverse core section and engaging the positioning slot of the adjacent side plate and connected to the associated opposite longitudinal frame member.

3. A mould as claimed in claim 1, the similarly oriented outer legs of the two end frames having movable locking elements and the adjacent regions of the adjacent mould plate having projecting locking elements arranged for establishing detachable interlocking engagement with said movable locking elements when said mould plate is moved to its inner moulding position.

4. In a mould for use in the construction of cavity walls which are cast in situ in successive sections: a pair of end frames and longitudinal frame members connecting said end frames together into a self supporting frame structure, a pair of spaced side mould plates projecting with their opposite ends beyond said end frames and movably carried by said frame structure for movement from an inner moulding position to an outer position, a core carried by said frame structure for forming a cavity in the cast wall, at least one end plate carried by said frame structure for closing at least one end of said mould cavity, each of said end frames including an upper cross member and a pair of outer legs depending therefrom, at least one of said end frames including an intermediate depending leg located between said outer legs, said core including a pair of side panels which extend beyond the intermediate leg of at least one of said end frames so as to project externally off said one end frame, said end plate including plate sections fitting between the outer sides of said side panels and the inner sides of said side plates for closing said one end of said mould cavity, said core also including a transverse core section extending toward at least one of said mould plates, said core also having an edge region fitting against the inner side of the intermediate leg of said one end frame which intermediate leg has an inward locking projection underlying the edge region and carrying the adjoining end of said core, said side plate toward which said transverse core section extends being provided with a vertical slot and said mould comprising an arm attached to said transverse section at one end extending through said slot and connected to at least one of said longitudinal members at the other end.

5. In a mould for use in the construction of cavity walls which arecast in situ in successive sections: a pair of end frames and longitudinal frame members connecting said end frames together into a self supporting frame structure, a pair of spaced side mould plates projecting with their opposite ends beyond said end frames and movably carried by said frame structure for movement from an inner moulding position to an outer position, a core carried by said frame structure for forming a cavity in the cast wall, at least one end plate carried by said frame structure for closing at least one end of said mould cavity, each of said end frames including an upper cross member and a pair of outer legs depending therefrom, at least one of said end frames including an intermediate depending leg located between said outer legs, said core including a pair of side panels which extend beyond the intermediate leg of at least one of said end frames so as to project externally off said one end frame, said end plate including plate sections fitting between the outer sides of said side panels and the inner sides of said side plates for closing said one end of said mould cavity, said core also including a transverse core section extending toward at least one of said mould plates, said core also having an edge region fitting against the inner side of the intermediate leg of said one end frame which intermediate leg has an inward locking projection underlying the edge region and carrying the adjoining end of said core, said core being of T-shape for forming a T junction between two walls, said transverse section of the core extending from the end of the longitudinal section thereof towards both 1 1 side plates, said side plates containing vertical -slots, a pair of arms one at each end of said transverse section, each of said arms extending through the slot on the adjacent side plate, means at the outer ends of each of said arms for connecting same to the adjacent longitudinal members of said frame structure.

1,173,166 Britton Feb. 29, 1916 Mumford Dec. 29, 1914 10 12 "Van" Guilder Nov. 6, 1917 Scruby 'et a1. July 18, 1922 League Dec. 26, 1922 Browne et a1 Nov. 20, 1923 Dille -Apr. 6, 1926 Seiler June 14, 1927 FOREIGN PATENTS Great Britain Jan. 14, 1943 Great Britain Nov. 21, 1947 Great Britain Nov. 18, 1948

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