AU684211B2 - Composite masonry block - Google Patents

Description

AUSTRALIA

Patents Act 1990 COMPLETE SPECIFICATION STANDARD PATENT Applicant: ANCHOR WALL SYSTEMS XNC Invention Title: COMPOSITE MASONRY BLOCK r o o s a r The following statement is a full description of this invention, including the best method of performing it known to us: 1 lr, I C- II COMPOSITE MASONRY BLOCK Field of the Invention This.invention relates generally to masonry blocks which may be used in the construction of landscaping elements. More specifically, the present invention relates to masonry block manufacturing processes and the resulting high strength masonry blocks which may be used to construct structures such as retaining walls of variable patterns.

Background of the Invention Soil retention, protection of natural and artificial structures, and increased land use are only a few reasons which motivate the use of landscape structures.

For example, soil is often preserved on a hillside by maintaining the foliage across that plane. Root systems from trees, shrubs, grass, and other naturally occurring plant life work to hold the soil in place against the forces of wind and water. However, when reliance on natural mechanisms is not possible or practical man often resorts to the use of artificial mechanisms such as retaining walls.

In constructing retaining wells many different materials may be used depending upon the given application. If a retaining wall is intended, to be used to support the construction of an interstate roadway, steel or a concrete and steel retaining wall may be appropriate. However, if the retaining wall is intended to landscape and conserve soil around a residential or 35 commercial structure a material may be used which compliments the architectural style of the structure such as wood timbers or concrete block.

I- 2 Of all these materials, concrete block has received wide and popular acceptance for use in the construction of retaining walls and the like. Blocks used for these purposes include those disclosed by Risi et al, U. S.

Patent Nos. 4,490,075 and Des. 280,024 and Forsberg, U.S. Patent Nos. 4,802,320 and Des. 296,007 among others. Blocks have also been patterned and weighted so that they may be used to construct a wall which will stabilize the landscape by the shear weight of the blocks. These systems are often designed to "setback" at an angle to counter the pressure of the soil behind the wall. Setback is generally considered the distance which one course of a wall extends beyond the front of the next highest course of the same wall. Given blocks of the same proportion, setback may also be regarded as the distance which the back surface of a higher course of blocks extends backwards in relation to the back surface of the lower wall courses. In vertical structures such as retaining walls, stability is dependent upon the setback between courses and the weight of the blocks.

For example, Schmitt, U.S. Patent No. 2,313,363 discloses a retaining wall block having a tongue or lip which secures the block in place and provides a certain S 25 amount of setback from one course to the next. The 0;Q* thickness of the Schmitt tongue or lip at the plane of the lower surface of the block determines the setback of the blocks. However, smaller blocks have to be made with smaller tongues or flanges in order to avoid compromising the structural integrity of the wall with excessive setback. Manufacturing smaller blocks having smaller tongues using conventional techniques results in a block tongue or lip having inadequate structural integrity. Concurrently, reducing the size of the 35 tongue or flange with prior processes may weaken and compromise this element of the block, the course, or even the entire wall. Previously, block molds were a.

3 used which required that the block elements such as a flange be ,,med from block mix or fill which was forced through the cavity of the mold into certain patterned voids within the press stamp or mold. The patterned voids ultimately become the external features of the block body. These processes relied on the even flow of a highly viscous and abrasive fill throughout the mold, while also not allowing for under-filling of the mold, air pockets in the fill or the mold, or any other inaccuracies which often occur in block processing.

The result was often that a block was produced having a well compressed, strong block body having weak exterior features. Any features formed on the block were substantially weaker due to the lack of uniform pressure applied to all elements of the block during formation. In turn, weaker exterior features on the outside of the block such as an interlocking flange could compromise the entire utility of the block if they crumble or otherwise deteriorate due.to improper formation.

The current design of pinless, mortarless masonry blocks generally also fails to resolve other problems such as the ability to construct walls which follow the natural contour of the landscape in a radial or 25 serpentine pattern. Previous blocks also have failed to provide a system allowing the use of anchoring mechanisms which may be affixed to the blocks without complex pinning or strapping fixtures. Besides being complex, these pin systems often rely on only one strand 30 or section of a support tether which, if broken, may completely compromise the structural integrity of the wall. Reliance on such complex fixtures often Sdiscourages the use of retaining wall systems by the every day homeowner. Commercial landscapers generally avoid complex retaining wall systems as the time and expense involved in constructing these systems is not supportable given the price at which landscaping 4 services are sold.

As can be seen the present state of the art of forming masonry blocks as well as the design and use of these blocks to build structure has definite shortcomings.

Summary of the Invention According to the present invention there is provided a composite masonry block comprising: a block body, said block body comprising a front surface and a back surface, said front surface and said back surface being substantially parallel to each other and separated by a distance comprising the depth of the block, a planar upper surface and a planar lower surface, said upper surface and said lower surface being substantially parallel to each other and separated by a distance comprising the height of the block, said lower surface having a smaller area than said upper surface, and opposed first and second side wall surfaces, said side wall surfaces 25 adjoining said block upper and lower o S surfaces, each said first and second side wall surfaces comprising a first part and a second part, each said side wall surface first part extending from said block front 30 surface and defining an included angle of *o more than 90° and less than 1800 with said front surface, each said side wall surface second part extending from the respective side wall surface first part to said block back surface; a flange extending from the block body \\MELsol\homeS\Lul l\Keep\30422-95-compo~ite-m onr-block.doe 3/09/97 4a below the plane of the block body lower surface and having a rear surface which is an extension of the block body back surface, said flange comprising a setback surface and a locking surface, said setback surface extending in a plane parallel to the block body upper and lower surfaces from a lower edge of the rear surface and adjoining said locking surface, said locking surface extending from the plane of said block body lower surface and adjoining said setback surface and said block body lower surface; and wherein the block body top surface and the block body side wall surfaces are generally continuous.

According to the present invention there is also provided a composite masonry block as described in the preceding paragraph made in a mould with an open top by a process comprising the steps of: i. filling the mould via its open top with 25 a masonry block mix comprising sand, •aggregate, and cement; ii. compacting the masonry block mix within the mould by the action of a 30 compression means pushed down on the masonry block mix through the open top of the mould, whereby the masonry block mix forms an uncured unit having the shape imparted to it by the mould and the compression means; -iii.stripping the uncured unit from the \\MELBO\homeS\Lulsa\Keep\30422-95-composlte-masonry-block.doc 3/09/97 4b mould; and iv. curing the uncured unit.

According to the present invention there is also provided a composite masonry block suitable for use in forming straight and serpentine retaining walls, said block comprising: a block body and an integral flange formed in a mould with an open top by a process comprising the steps of: i. filling the mould via its open top with a masonry block mix comprising sand, aggregate, and cement; ii. compacting the masonry block mix within the mould by the action of a compression means pushed down on the masonry block mix through the open top of the mould, whereby the masonry block mix forms an uncured unit having the shape imparted to it by the mould and the compression means; iii.stripping the uncured unit from the mould; and 30 iv. curing the uncured unit; and said block body comprising: i. an upper surface; ii. a lower surface which is generally parallel to the upper surface; \\MELBO\home \/O9laI9p\30422-95-c p ite-mIsonry-block.doc 3109/97 4c iii.a front surface which is generally perpendicular to the upper and lower surfaces; iv. a back surface which is generally perpendicular to the upper and lower surfaces, said front and back surfaces being separated by a distance comprising the depth of the block; v. a first side wall extending from the front surface to the back surface and extending from the upper surface to the lower surface, said first side wall being perpendicular to the upper and lower surfaces, and said first side wall including a planar first part extending from the front surface and defining an included angle of greater than 900 and less than 1800 with the front surface, and a planar second part S* between the side wall first part and the back surface; 25 vi. a second side wall opposed to the first side wall, said second side wall extending from the front surface to the back surface and extending from the upper surface to the lower surface, said second side wall being perpendicular to the upper and .ower surfaces, and said second side wall including a planar first part extending from the front surface and defining an included angle of greater than 900 and less than 1800 with the front surface, and a planar second part adjoining the \\MELBO I\home$\Lui a \Keep\30422 -45comosi e-masonry-block.doc 3/09,'97 ap 4d side wall first part and the back surface; vii.said block body lower surface b.i.ng formed by the compression means during the moulding process, and being substantially planar and substantially smooth as a result; and viii.said first and second block body side wa..ls being formed by corresponding vertical walls of the mould during the moulding process, and being substantially continuous; and said flange including a rear surface which is an extension of the back surface of the block body, and a forwardly facing locking surface which extends downwardly from the lower surface of the block body, the depth of said flange being the distance between its locking surface and its rear surface, measured in the plane of the lower surface of the block body.

According to the present invention there is also provided a serpentine retaining wall comprising at least a first lower course and a second upper course, each of said courses comprising a plurality of the composite masonry 30 blocks defined in the preceding paragraphs with adjacent blocks being positioned so that the side wall first part surfaces and the front surfaces of the blocks form a continuous multi-faceted front surface of the wall.

According to the present invention there is also provided a retaining wall comprising at least a first lower course and a second upper course, each of said courses \\I-LLOI\homeS\Luia.\keep\d3022-95-ompdo 3/09191 4e comprising one or more of the composite masonry blocks described in the preceding paragraphs, at least one anchoring matrix interposed between a portion of at least said first course block and a portion of at least said second course block wherein the lower surface of said second course block is positioned on top of the upper surface of said first course block, said block flange of said second course block being positioned adjacent and behind the block back surface of said first course, said anchoring matrix being distorted by said second course block flange and said matrix being fixed in position between the first and second courses by the distorted interposition of said matrix between said first and second course blocks and the weight of said second course.

as 4 a et e• e e t \\HELBO I\home \Lui sa\Keep\3O422-95-composite-masonry-bLock.doc 3/09107 5 Brief Description of the Drawings FIGURE 1 is a perspective view of a preferred embodiment of the mortarless retaining wall block in accordance with the present invention.

FIGURE 2 is a top plan view of the mortarless retaining wall block shown in Fig. 1.

FIGURE 3 is a side elevational view of a mortarless retaining wall block shown in Fig. 1.

FIGURE 4 is a perspective view of an alternative embodiment of the mortarless retaining wall block in accordance with the present invention.

FIGURE 5 is a top plan view of the mortarless retaining wall block depicted in Fig. 4.

FIGURE 6 is a side elevational view of the mortarless retaining wall block depicted in Figs. 4 and FIGURE 7 is a partially cut away perspective view of a retaining wall having a serpentine pattern constructed with one embodiment of the composite masonry block of the present invention.

FIGURE 8 is a partially cut away perspective view of a retaining wall constructed with one embodiment of the composite masonry block of the present invention showing use of the block with anchoring matrices laid into the ground.

FIGURE 9 is a cut away view of the wall shown in Fig. 8 taken along lines 9-9.

FIGURE 10 is a schematic depiction of one embodiment of the method of the present invention.

r I-- ~P ~C1~ 6 FIGURE 11 is a side elevational view of one embodiment of the masonry block mold in accordance with the present invention.

FIGURE 12 is a top plan view of the masonry block mold shown in Fig. 11 in accordance with the present invention. FIGURE 13 is an exploded perspective view of one embodimeht of the masonry block mold of the present invention showing application of the supporting bars, core forms, and stamp plate.

Detailed Description of the Preferred Embodiments Accordingly, the present invention provides a composite masonry block, structures resulting from this block, a masonry block mold for use in manufacturing the block of the present invention, and a method of using ~his mold. The present invention provides a mortarless interl.-oIing masonry block having a high structural ixi .egrity which may be used to construct any number of structures having a variety of patterns. Moreover, the block of the present invention is made through a process and mold which facilitates and enhances the formation of a high strength block with an interlocking element which also has a high structural integrity and allows the fabrication of various landscaping structures of high 25 strength.

Composite Masonry Block Referring to the drawings wherein like numerals represent like parts throughout several views, a S 30 composite masonry block 15 is generally shown in Figs.

1-3 and 4-6. One aspect of the present invention is a composite masonry block having an irregular trapezoidal shaped block body The block body generally comprises a front surface 22 and a back surface 24 which are substantially parallel to each other. The front 22 and back 24 surfaces are separated by a distance comprising the I 111 7 depth of the block. The block also has an upper surface 26 and a lower surface 28 soparated by a distance comprising the height of the block 15. The lower surface 28 generally has a smaller area proportion than the upper surface 26, Fig. 3.

The block also has a first 30 and second 31 sidewall separated by a distance comprising the width of the block, Figs. 2 and 5. The sidewalls adjoin the block upper and lower surfaces. Both sidewalls comprise a first and second part. The sidewall first part extend from the block front surface towards the back surface at an angle of no greater than ninety degrees in relationship to the block front surface. The sidewall second part adjoins and lies between the first part and the block back surface.

The block also has a flange 40 spanning the width of the block back surface 24 and extending from the block back surface 24 past the height of the block, Figs. 3 and 6. Generally, the flange comprises a setback surface 42 and a locking surface 44. The setback surface 42 extends from the lower edge of ,the flange in a plane parallel to the block upper 26 and lower 28 surfaces towards the block front surface 22 to adjoin the flange locking surface 44. The locking surface 25 extends from the plane of the block lower surface 28 and adjoins the setback surface 42.

"The first element of the composite masonry block of e. the present invention is the body of the block 20, Figs.

1-3. The block body 20 provides weight and physical 30 structure to the system in which the block is used.

Landscaping elements such as retaining walls often must be constructed of units which not only provide a structural impediment to resist the natural flow of soil, but must also provide the shear weight to withstand these forces. Moreover, the body of the block functions to provide the supporting surfaces which may 0 be used to seat an aesthetically pleasing pattern such i iia 111 1111111 I I 8 as that found on the front surface 22 of the block, Fig.

i. Finally the body of the block of the present invention provides a substrate for holding elements which help form an interlocking matrix with other blocks when used in a structure such as a wall. In particular, the block carries a flange 40 which assists in the interlocking function of the block.

Generally, the block may take any number of shapes in accordance with the present invention. Distinctive of the present invention is the ability to use the block seen in Figs. 1-3 and 4-6 to construct either straight or serpentine walls. Accordingly, the block of the present invention preferably has an irregular trapezoidal shape having a parallel front 22 and back surfaces 24, Fig. 2. The necessarily irregular nature of the trapezoidal block of the present invention comes from the blocks two part sidewalls 30, 31, Fig. 2.

As can be seen, the block body 20 generally has eight surfaces. The front surface 22 generally faces outward from the structure and may either have a plain or a roughened appearance to enhance the blocks aesthetic appeal. In fadt, the block front surface 22 may be smooth, rough, planar or nonplanar, single *e faceted or multi-faceted.

.i 25 The back surface 24 of the block generally lies parallel to the front surface 22. The top surface 26 generally lies parallel to the bottom surface 28. As .0o can be seen, Fig. 3, the upper surface has a greater depth across the block than the lower surface 28.

30 Generally, the difference in depth between the upper surface 26 and the block lower surface 28 is attributable to the position of the flange 40, extending ee 09 S in part from the lower surface of the block, Fig. 3.

The block body sidewall surfaces 30, 31 lie across 35 the width of the block, Fig. 2. The sidewalls of the r block body of the present invention allow for the construction of straight structures or serpentine I i I 9 structures and more particularly outside radius turns.

Accordingly, the block sidewalls are preferably of twopart construction. As can be seen in Fig. 2, the block sidewall first parts 34, 38 extend on either side of the block from the block front surface at an angle, alpha, of approximately ninety degrees toward the block back surface, Fig. 2.

Generally, at about one-fifth to about one-quarter of the depth of the block, the sidewall first part 38 joins the sidewall second part, Figs. 2 and 3. The sidewall second part 32, 36 generally continue further towards the back surface 24 of the block body.

Preferably, the sidewall second surfaces converge towards each other as these surfaces move towards the back surface of the block. The angle, beta, of the sidewall second preferably ranges in magnitude from about 30 degrees to about 60 degrees in relation to the block back surface, Fig. 2. This provides structures having a more aesthetically preferable or pleasing appearance by avoiding a "stepped" appearance which results from the adjacent placement of blocks having an extreme sidewall angle.

The two-part sidewalls allow for the construction of S" aligned, straight walls given the sidewall first part 25 which aligns with adjoining sidewall first parts of blocks in the same wall course, (see 34, 38, Fig. 8).

Optionally, the same embodiment of the block of the present invention allows the construction of aligned serpentine structure 45, Fig. 7.

30 Alternatively, the first part of the sidewall surfaces may have an angle, alpha, which is less than ninety degrees, Figs. 4-6. This embodiment of the block e* of the present invention may more preferably be used in the construction of serpentine structures such as that 35 shown in Fig. 7. In this instance, the block sidewall first part provides a block with a more aesthetically refined, rounded or multi-faceted front surface 22, Fig.

i 11 10 4. The sidewall second part in this embodiment of the block of the present invention also converge along angle, beta, towards the rear surface of the block allowing the construction of a structure similar to that shown in Fig. 7.

The block of the present invention also comprises a flange 40, Figs. 3 and 6. The flange 40 assists in providing an effective interlocking mechanism which stabilizes the structures made in accordance with the present invention. Moreover, the block mold and method of molding blocks of the present invention allow the formation of block elements, such as flange 40, having high structural strength. The processing simultaneously affords the construction of interlocking elements having minimal size. The result of flanges having such minimal size is a structure having minimal setback and maximum stability given the weight and proportions of the blocks used.

The flange 40 may take any number, of forms.

Preferably, the flange 40 spans the width the blocks back surface 24 and extends from the block back surface beyond the height of the block. Generally, the flange will extend beneath the lower surface of the block so that when stacked the flange 40 of each ascending block 25 will hang over and lock onto the back surface of the block of the adjacent block in the next lowest course, Fig. 9.

The flange 40 may comprise any number of surfaces to aid in seating and locking the block in place.

:30 Preferably, the flange has a setback surface 42 and a locking surface 44. The setback surface generally adjoins and extends from the lower edge of the flange in a plane parallel to the block upper and lower surfaces.

Adjoining the flange setback surface 42 and the block 35 lower surface 28 is the flange locking surface 44, Figs.

o 3 and 6.

eoThe width of the setback surface determines the 4 oooo The width of the setback surface determines the 11 amount that the blocks of each successive course will setback from blocks from the next lower course.

Generally, each successive course of blocks should setback far enough to maintain the stability of the soil behind the wall. In turn, flange 40 generally should be large enough to provide a high strength interlocking element, while remaining small enough to retain the stability of the wall. To this end, the width W of the setback surface 42, Figs. 3 and 6, generally ranges in width from about 1 inch to about 2 inches across its base. This width range provides minimal setback while ensuring the provision of a strong flange.

In its most preferred mode, the block of the present invention is suitable for both commercial and residential use by landscapers as well as homeowners for use in building landscape structures. In this instance, the block generally weighs from about 50 lbs. to about 100 lbs. and more preferably 65 lbs. to 75 lbs. and has a height of about 3 inches to 12 inches, and more preferably 3 inches to 6 inches, a width of about 12 inches to about 18 inches, and more preferably 14 inches to 16 inches, and a length of about 6 inches to about 24 inches and more preferably 14 inches to about 16 inches.

These measurements allow the maintenance of the 25 appropriate weight to width ratio Qf the block, provide S. a block weighted to allow manual transport by one person, and ensures optimal efficiency in the use of machinery.

30 Block Structures The composite masonry block 15 of the present invention may be used to build any number of landscape 0*00 structures. Examples of the structures which may be constructed with the block of the present invention are 35 seen in Figs. 7-9. As can be seen in Fig. 7, the o. composite masonry block of the present invention may be used to build a retaining wall 45 using individual ii 12 courses 47 to construct to any desired height. The blocks may be stacked in an even pattern or an offset pattern depending on the intended application.

Generally, construction of a structure such as a retaining wall 45 may be undertaken by first defining a trench area beneath the plane of the ground 48 in which to deposit the first course 49 of blocks, Figs. 7 and 8.

Once defined, the trench is partially refilled and tamped or flattened. The first course 49 of blocks is then laid into the trench, Fig. 8. The first course-of blocks may often comprise blocks which are laid on their back in order to define a pattern or stop at the base of the wall. As can be seen in Figs. 7-9, successive courses of blocks are then stacked on top of preceding courses while backfilling the wall with soil 48'. As stability is dependent upon weight and minimal setback, the miniml setback provided by the blocks of the present invention assists in further stabilizing even lighter weight blocks. This minimal setback adds to the stability of smaller size blocks by slowing the horizontal movement backward of the wall through the addition of successive courses.

As can be seen in Figs. 7 and 8 the blocks of the present invention allow for the production of serpentine 25 or straight walls. The blocks may be placed at an angle in relationship to one another so as to provide a serpentine pattern having convex and concave surfaces, Fig. 7. Moreover, depending on which embodiment of the block of the present invention is used, various 30 patterns, serpentine or straight, may be produced in any given structure.

One benefit of the blocks of the present invention is their two part sidewall. While the first part of the side wall has a right angle in relationship to the front 35 surface of the block 22, the second part of the block sidewalls converge or angle towards each other as the sidewall moves towards the back surface 24 of the block.

iC- -I I- 13 The converging second part of the block sidewalls allows the blocks to be set in a range of angles relative to adjacent blocks of the same course, Fig. 7.

Moreover, when a straight wall is desired, Fig. 8, the blocks of the present invention allow for the placement of the blocks flush against each other. As can be seen in Fig. 8, block sidewall first part surfaces 38 and 34 of two adjacent blocks are flush against one another. This allows for the construction of a wall having tighter block placement.

In contrast, if a more highly angled serpentine wall is desired the block depicted in Figs. 4-6 may be used.

This block comprises sidewall first parts 34, 38 which have an angle and which may be less than 90 As can be seen, the sidewalls first part 34, 38 effectively become the second and third faces along with the block front surface 22, of a three faceted front of the block. The lack of a 900 sidewall first part shortens the effective length of the block depicted in Figs.. 4-6. Thus, in angling the blocks of Figs. 4-6 the length of the sidewalls first part 34, 38 does not become a factor block placement. As a result blocks of the same relative size and weight may be used more efficiently given limited space.

As can be seen in Fig. 8, a supporting matrix 42 may be used to anchor the blocks in the earth fill 48' :°.-behind the wall. One advantage of the block of the present invention is that despite the absence of pins, the distortion created by the block flange 40 anchors 30 the entire width of the matrix 42 when pressed between two adjacent blocks of different courses, Fig. 9.

In this instance, a wall is constructed again by forming a trench in the earth. The first course 49 of the wall is seated in the trench and will be under soil 35 once the wall is backfilled. The blocks 15 are placed on a securing mat or matrix 42 which is secured within the bank 48' by deadheads 44. The deadheads 44 serve as 14 an additional stabilizing factor for the wall providing additional strength. The deadheads 44 may be staggered at given intervals over the length of each course and from course to course to provide an overall stability to the entire wall structure.

Block 4Molding the Blocks Another aspect of the present invention is the process for casting or forming the composite masonry blocks of this invention usij.ng a masonry block mold.

Generally, the process for making this invention includes block molding the composite masonry block by filling a block mold with mix and casting the block by compressing the mix in the mold through the application of pressure to the exposed mix at the open upper end of the block mold. Formation of the block of the present invention is undertaken with a stepped mold to ensure that the pressure applied to the entire block 15 is uniform across the body 20 and flange An outline of the process can be seen .in the flow chart shown in Fig. 10. Generally, the processes is initiated by mixing the concrete fill. Any variety of concrete mixtures may be used with this invention depending upon the strength, water absorption, density, and shrinkage among other factors desired for the given °concrete block. One mixture which has been found to be preferable includes cementatious materials such as cement or fly ash, water, sand, and gravel or rock.

However, other components including plasticizers, water 30 proofing agents, cross-linking agents, dyes, colorants, pigments etc. may be added to the mix in concentrations up to 5 wt-% depending upon the physical characteristics which are desired in the resulting block.

Blocks may be designed around any number of 35 different physical properties in accordance with ASTM S Standards depending upon the ultimate application for the block. For example, the fill may comprise from IY- 15 to 95% aggregate being sand and gravel in varying ratios depending upon the physical characteristics which the finished block is intended to exhibit. The fill generally also comprises some type of cementatious materials at a concentration ranging from 4% to 12%.

Other constituents may then be added to the fill at various trace levels in order to provide blocks having the intended physical characteristics.

Generally, once determined, the fill constituents may be placed in any number of general mixers including those commonly used by those with skill in the art for mixing cement and concrete. To mix the fill, the aggregate, the sand and rock, is first dumped into the mixer followed by the cement. After one to two and onehalf minutes, any plasticizers that will be used are added. Water is then introduced into the fill in pulses over a one to two minute period. The concentration of water in the mix may be monitored electrically by noting the resistance of the mix at various times during the process. While the amount of water may vary from one fill formulation to another fill formulation, it generally ranges from about 1% to about Once the fill is mixed, the fill is then loaded into a hopper which transports the fill to the mold 50 within the 25 block machine, Figs. 11 and 12.

e The mold 50 generally comprises at least four sides bordering a central cavity. As can be seen in Fig. 12, the mold generally has a front wall 58, a back wall 56, and a first 52 and second 54 opposing side. The S: 30 opposing sides (52, 54) are each generally stepped in area 53 having a depressed center length 54') and an elevated higher end adjacent the front and back walls, Fig. 11. The central cavity 55 is bordered by these walls.

I--

~a -C I I llli- -F~ 16 Core forms 62 may also be placed in the mold cavity prior to loading the ,old with block mix.

Generally, the core forms 62 may be supported by bars positioned across opposing first 52 and second 54 sidewalls and adjacent to the stepped regions 53 in each of these sidewalls.

Turning to the specific aspects of the mold, the mold functions to facilitate the formation of the blocks. Accordingly, the mold may comprise any material which will withstand the pressure to be applied to block fill by the head. Preferably, metals such as steel alloys having a Rockwell "C"-scale ranging from about 60-65 provide optimal wear resistance and the preferred rigidity. Generally, metals found useful in the manufacture cf the mold of the present invention include high grade carbon steel 41-40 AISI (high nickel content, prehardened steel), carbon steel 40-50 (having added nickel) and the like. A preferred material includes carbon steel having a structural ASTM of A36.

The mold of the present invention may be made by any number of means known to those of skill in the art.

Generally, the mold is produced by cutting the stock steel, patterning the cut steel, providing an initial weld to the patterned mold pieces and heat treating the 25 mold. Heat treating generally may take place at temperatures ranging from 1000 0 F. to 1400 0 F. for 4 to hours depending on the ability of the steel to withstand processing and not distort. After heat treating, final welds are then applied to the pieces of the mold.

30 Turning to the individual elements of the mold, the mold walls generally function according to their form by withstanding the pressure created by the press.

'Further, the walls measure the height and depth of the resulting blocks. Accordingly the mold walls must be 35 made of a thickness which will accommodate the processing parameters of block formation given a specific mold composition. Preferably, the mold walls I i s 3y-FIl 17 range in thickness from about 0.25 inch to about inches, preferably from about 0.75 inch to 1.5 inches.

Additionally, the mold sidewalls function to ensure that uniform pressure is applied throughout the entire block during formation. Uniform pressure on all block elements is ensured by retaining additional block fill or mix adjacent the mold front 56 and back 58 wall in areas 55A and 55B, which will be the area in which the block flange 40 (Figs. 3 and 6) is formed. By retaining mix in areas 55A and 55B, the same compression is applied to the mix which becomes the block body and to the mix which become_ the block flange. The application of uniform pressure to the block flange allows the construction of smaller blocks having smaller, stronger flanges. In turn, a smaller flange provides a block which results in a more vertical structure such as a wall having less setback from course to course and, as a result, greater stability over its height.

Generally, the mold sidewalls 52, 54 may take any form which provides this function. Preferably, the mold sidewalls 52, 54 are stepped 53 as can be seen in Figs.

11 and 12. Turning -o Fig. 11, mold sidewall 54 is .stepped twice across its length in region 53 to create a depressed central length 54' in the sidewall 54. In 25 Fig. 11, the mold 50 is shown during the actual block S. formation step, with the head 72 compressed onto the block fill in the mold The mold may preferably also comprise support bars 60 and core forms 62. The support bars 60 hold the core 30 forms 62 in place and act as a stop for block fill or mix which is retained in the elevated (or stepped) **region of the mold 50 thereby preventing the fill from flowing back into the area bordered by the depressed central lengths 52' and 54' of sidewalls 52 and 54.

35 Here again, the support bars may take any shape, size material composition which provides these functions.

As can be seen more clearly in Fig. 12, support bar Isa I~ B-LI~I~ l~rrC N I 18 is preferably long enough to span the width of mold resting on opposing sidewalls 52 and 54. Preferably the support bars 60 are high enough to restrict the flow of fill into the central area of the mold cavity Complementing this function, the support bars 60 are generally positioned in the depressed central areas 52' and 54' of the opposing sidewalls immediately adjacent stepped region 53, Fig. 12.

As can be seen in outline in Fig. 11, the core forms 62 are supported by bars 60 which span the width of the mold 50 resting on the opposing sidewalls 52, 54. The head 72 and head stamp 70 (also seen in ontline fFig.

11)) are patterned to avoid contact with the core forms 62 and support bars The core forms have a number of functions. The core forms 62 act to form voids in the resulting composite masonry block. In turn, the core forms lighten the blocks, reduce the amount of fill necessary to make a block and add a handle to the lower surface of the block which assists in transport and placement of the blocks.

In concert with these functions the cores may take any number of forms. Preferably, the core forms are approximately three inches square and penetrate from about 60% to about 80% of the blocks height and most S 25 preferably about 70% to 80% of the block height. Also S. preferred, as can be seen in the explodeO view provided in Fig. 13, the core forms 62 are affixed to the support bar 60 at insert regions 60A. These insert regions assist in positioning the cores and during processing, 30 reduce the build up of block mix or fill on the lower edge of the support bar 60. In turn, maintaining a support bar 60 clean of mix build up maintains the planarity of the lower surface of blocks formed in accordance with the present invention.

35 In operation, the mold 50 is generally positioned in ~oe a block molding machine atop a removable or slidable substrate 80, Fig. 13. The support bars 60 and core I bl I~UBLlilPY*A--~-- l~-ra~ 19 forms 62 are then placed into the mold 50. The mold is then loaded with block mix or fill. As configured in Fig. 12, the mold 50 is set to form two blocks simultaneously in "siamese" pattern. As will be seen, once formed and cured, the blocks may be split along the edge created by flange 51 generally along axis A.

Prior to compression the upper surface of the mold is scraped or raked with a feed box drawer (not shown) to remove excess fill. Scraping of the mold is preferably undertaken in a side-to-side direction in order to avoid contact with'the side bars 60. Also, removal of the excess fill from the mold by scraping from the side allows for the depressed central lengths 52' and 54' of the mold and does not disturb the fill at the stepped ends of the mold The mold is then subjected to compression directly by head 70 (shown in outline complete in Fig. 11 and in perspective in Fig. 13). Preferably the head 70 is patterned 74 to avoid the support bars 60 and co7e forms 62. Also, as can be seen in Fig. 13, the head preferably has an instep 75 which shape complements and results in, the formation of the block flange Instead of relying on the head to force block fill towards either end of the mold 50 into instep 75 to 25 create a flange, the mold 50 maintains fill in the stepped regions at either end of the mold 50. The fill in these regions comes into direct contact with instep immediately upon lowering of the head 70. As a S result, the fill in this stepped area is subjected to 30 the same pressure as the fill in other areas of the mold. This results in a flange 40 of the same structural strength as the other elements of the block cC as L1 i 20 Once the mold has been filled, leveled by means such as a feed-box drawer, and agitated, a compressicl mechanism such as a head converges on the exposed surface of the fill. The head acts to compress the fill within the mold for a period of time sufficient to form a solid contiguous product. The head 70, as known to those of skill in the art, is a unit which has a pattern which mirrors the blocks and core forms 62 and is complementary to that of the mold 50. Generally, the compression time may be anywhere from 1/2 to 3 seconds and more preferably about 1.5 to about 2 seconds. The compression pressure applied by the'head ranges from about 5000 to 8000 psi and preferably is about 7500 psi.

Once a compression period is over, the head in combination with an underlying pallet 80 acts to strip the blocks 15 from the mold 50. At this point in time, the blocks are formed. Any block machine known to those of skill in the art may be used. One machine which has been found useful in the formation of blocks in accordance with the present invention is a Besser V-3/12 block machine.

Prior to -compression the mold may be vibrated.

Generally, the fill is transported from the mixer to a i hopper which; then fills the mold 50. The mold is then agitated for up to two or three seconds, the time necessary to ensure that the fill has uniformly spread throughout the mold. The blocks are then formed by the compressing action of the head.

Once the blocks are formed, they may be cured through any means known to those of skill in the art.

Curing mechanisms such as simple air curing, autoclaving, steam curing or mist curing, are all useful methods of curing the block of the present invention.

Air curing simply entails placing the blocks in an 35 environment where they will be cured by the open air *0*t o over time. Autoclaving entails placing the blocks in a pressurized chamber at an elevated temperature for a ii-I ~asn 21 certain period of time. The pressure in the chamber is then increased by creating a steady mist in the chamber.

After curing is complete the pressure is released from the chamber which in turn draws the moisture from the blocks.

Another means for curing blocks is by steam. The chamber temperature is slowly increased over two to three hours and then stabilized during the fourth hour.

The steam is gradually shut down and the blocks are held at the eventual temperature, generally around 120 200°F. for two to three hours. The heat is then turned off and the blocks are allowed to cool. In all instances, the blocks are generally allowed to sit for twelve to twenty-four hours before being stacked or stored. Critical to curing operations is a slow increase in temperature. If the temperature is increased too quickly, the blocks may "case-harden." Case-hardening occurs when the outer shell of the blocks hardens and cures while the inner region of the block remains uncured and moist. While any of these curing mechanisms will work, the preferred curing means is autoclaving.

Once cured, the blocks may be split if they have been cast "siamese" or in pairs. Splitting means which may be used in the method of the present invention include a manual chisel and hammer as well as machines l. known to those with skill in the art for suci- purposes.

Splitting economizes the production of the blocks of the present invention by allowing the casting of more than 30 one block at any given time. When cast in pairs, the blocks 15, Fig. 13,, may be cast to have an inset groove created by flange 51 on their side surfaces between the two blocks. This groove provides a natural weak point or fault which facilitates the splitting action along 35 axis The blocks may be split in a manner which provides a front surface 22 which is smooth or coarse, single-faceted or multi-faceted, as well as planar or II- I I c 22 curved. Preferably, splitting will be completed by an automatic hydraulic splitter. Once split, the blocks may be cubed and stored.

The above discussion, examples, and embodiments illustrate our current understanding of the invention.

However, since many variations of the invention can be made without departing from the spirit and scope of the invention, the invention resides wholly in the claims hereafter appended.

S* o *0 6 *000 *0 0 -I lilrp~- sll

Claims (8)

1. 2. A composite masonry block suitable for use in forming straight and serpentine retaining walls, said block comprising: a block body and an integral flange formed in a mould with an open top by a process comprising the steps of: i. filling the mould via its open top with Sa masonry block mix comprising sand, aggregate, and cement; 25 ii. compacting the masonry block mix within '.*the mould by the action of a compression means pushed down on the masonry block mix through the open top of the mould, whereby the masonry block 30 mix forms an uncured unit having the shape imparted to it by the mould and the compression means; iii.stripping the uncured unit from the mould; and Siv. curing the uncured unit; and RAL f :\Luisa\Keep\J0422-95-compo ie-moanry-block.doc 3/09/17 rT 1 -s i I 25 said block body comprising: i. an upper surface; ii. a lower surface which is generally parallel to the upper surface; iii.a front surface which is generally perpendicular to the upper and lower surfaces; iv. a back surface which is generally perpendicular to the upper and lower surfaces, said front and back surfaces being separated by a distance comprising the depth of the block; v. a first side wall extending from the front surface to the back surface and extending from the upper surface to the lower surface, said first side wall being perpendicular to the upper and lower surfaces, and said first side wall including a planar first part S 25 extending from the front surface and defining an included angle of greater than 900 and less than 1800 with the front surface, and a planar second part between the side wall first part and A S 30 the back surface; vi. a second side wall opposed to the first side wall, said second side wall extending from the front surface to the back surface and extending from the urpper surface to the lower surface, said second side wall being \\MELBO1\hom.\Lu 8a\ eep\ /922-95-comp7y309/97 26 said second side wall being perpendicular to the upper and lower surfaces, and said second side wall including a planar first part extending from the front surface and defining an included angle of greater than 900 and less than 1800 with the front surface, and a planar second part adjoining the side wall first part and the back surface; vii.said block body lower surface being formed by the compression means during the moulding process, and being substantially planar and substantially smooth as a result; and viii.said first and second block body side walls being formed by corresponding vertical walls of the mould during the moulding process, and being substantially continuous; and said flange including a rear surface which 25 is an extension of the back surface of the block body, and a forwardly facing locking surface which extends downwardly from the lower surface of the block body, the depth So. of said flange being the distance between 30 its locking surface and its rear surface, measured in the plane of the lower surface of the block body.
2. 3. A composite masonry block defined in claim 1 made in a mould with an open top by a process comprising the steps of: H:\Lu Isa\Keep\30422-95-composi Ce-masoni-y-blockdo 3/0'/97 27 i. filling the mould via its open top with a masonry block mix comprising sand, aggregate, and cement; ii. compacting the masonry block mix within the mould by the action of a compression means pushed down on the masonry block mix through the open top of the mould, whereby the masonry block mix forms an uncured unit having the shape imparted to it by the mould and the compression means; iii.stripping the uncured unit from the mould; and iv. curing the uncured unit,
3. 4. The block defined in claim 1 or claim 3 wherein the front surface is perpendicular to the upper and lower surfaces.
4. 5. The block defined in any one of the preceding claims wherein the setback surface has a width ranging from 25 0.5 to 2 inches. a *q ea
5. 6. The block defined in any one of the preceding claims wherein the front surface is planar. 30 7. The block defined in any one of claims 1 to 4 wherein the front surface is coarse.
6. 8. A serpentine retaining wall comprising at least a first lower course and a second upper course, each of said courses comprising a plurality of the composite masonry blocks uefined in any one of the preceding claims with adjacent blocks being positioned so that the side wall H\LUid\Keep\30422-95-cmp osite-m.of y-blk.doc 3/09/97 i i -I i e n 28 first part surfaces and the front surfaces of the blocks form a continuous Julti-faceted front surface of the wall.
7. 9. The retaining wall defined in claim 8 wherein the block of said first course is vertically offset from the block of said second course. A retaining wall comprising at least a first lower course and a second upper course, each of said courses comprising one or more of the composite masonry blocks defined in any one of claims 1 to 7, at least one anchoring matrix interposed between a portion of at least said first course block and a portion of at least said second course block wherein the lower surface of said second course block is positioned on top of the upper surface of said first course block, said block flange of said second course block being positioned adjacent and behind the block back surface of said first course, said anchoring matrix being distorted by said second course block flange and said matrix being fixed in position between the first and second courses by the distorted interposition of said matrix between said first and second course blocks and the weight of said second course. 25 11. The retaining wall defined in claim 10 wherein said wall has a serpentine pattern.
8. 12. The retaining wall of claim 10 or claim 11 wherein the blocks of said first course are vertically offset from the blocks of said second course. Dated this 4th day of September 1997 ANCHOR WALL SYSTEMS INC. By their Patent Attorneys GRIFFITH HACK Fellows Institute of Patent Attorneys of Australia \\tEL3O t \home\LU i aKeep\3O422-95-compOI I te-in,iioriryblock.doc 4/09/07 I ABSTRACT A composite masonry block comprises a block body. The block body comprises a front surface and a back surface separated by a distance comprising the depth of the block, an upper surface and a lower surface separated by the distance comprising the height of the block, and first and second sidewall surfaces adjoining said block upper and lower surfaces. The first and second sidewall surfaces each comprise a first and second part. The sidewall first part surfaces extend from said block form surface at an angle of 90 degrees or less in relation to said block front surface. The sidewall second part surfaces adjoin and lie between the sidewall first parts and said block back surface and converge towards said block back surface. A flange is affixed to the block adjacent the rear surface and extends downwardly from the block body. The flange comprises a locking surface adapted to nest with the next lowest course of blocks, and the locking surface extends downwardly from the plane of the block lower surface. 0 6* a 000* 0 S S* S *0o lr ia