US3070341A - Shore head - Google Patents

Description

Dec. 25, 1962 Filed July 18, 1960 H. S. MORRISON SHORE HEAD 6 Sheets-Sheet 1 Dec. 25, 1962 H. s. MORRISON SHORE HEAD Filed July 18, 1960 6 Sheets-Sheet 2 IN V EN TOR.

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SHORE HEAD Filed July 18, 1960 6 Sheets-Sheet 6 United States Patent Ofilice 3,070,341 Patented Dec. 25, 1-962 3,070,341 SHORE HEAD Hugh Shannon Morrison, Caracas, Venezuela (7458 Kingston Ave, Chicago 49, ill.) Filed July 18, 1960, Ser. No. 43,404 7 Claims. (Cl. 248-357) multiplicity of temporarily erected mold sections known as pans. The pans, which may be taken down after the concrete hardens and which may be re-used on the next floor to be poured, are held in place for pouring upon portable shoring devices which generally have: a base which engages a firm supporting surface below the level of the floor to be poured; a column, usually of adjustable length, secured to the base; and a shore head which engages the pans, holding each at the proper height in an inverted position. Various types of pans have been designed and used. Standard nail-down pans of generally C shape cross-section are made either with or without integral flanges. Domes, or the dome-type of pan are also popular. The underside of a floor poured with standard pans is an essentially flat surface broken by a multiplicity of parallel joists depending therefrom. The underside of a floor poured in dome-type pans has a waffle surface. My invention is particularly adapted for use with domes, but has a degree of usefulness with standard pans, which will be explained later.

In constructing a multi-story building, a foundation is first prepared. Then enough pans are erected to form a mold structure for the floor immediately above. The pans are supported on portable shores, which are usually cross braced. It is necessary that many shores be used in order to obtain the necessary support. When the concrete has been poured and has sufliciently hardened, the bracing and shores are removed, and the pans taken down. The disassembled form-work is then transported up to the newly hardened first level and reassembled to serve as a mold for the second level. The entire process of pouring the concrete; allowing it to harden; tearing out the bracing, shores and pans; carrying them to the next level and reassembling them is repeated again and again until the required number of stories has been erected.

Heretofore, dome type pans have been used in flange to flange abutting relationship, the width of the concrete joist being governed by the combined width of the abutting flanges and the depth of said joists being governed by the height of the dome sides. Domes are made in varying depths (dome side heights) for pouring slabs with joists corresponding to said depths. Each set of pans, however, was useful for pouring only one depth of joist. A set of pans is expensive, so expensive that a full set of pans corresponding to all the useful joist sizes is not within the reach of many small contractors. If they desire to construct a building which requires a joist of a size that cannot be produced with the pans they own, they must borrow or lease the proper size of pans, lose their opportunity to bid, or, if they have pans capable of pouring a joist larger than what is needed, run up their concrete consumption and erection cost by using too deep a pan. Clearly, it would be an advantage to have some method of making a single set of pans do the work of many sets of different sizes, for it would save material, give small contractors a better chance ofbidding successfully on jobs requiring odd-size pans, and reduce the overhead of larger contractors who can afford many sets, but who would not be required to buy so many if such a method were available. Therefore it is an object of this invention to provide a shoring device. for pouring with one set of pans, slabs with a plurality of different joist sizes.

Because of the repetitive nature of erecting and disassembling the great number of shores which are used in pouring a slab floor (as many as one every ten inches in each direction, in extreme cases) seemingly small improvements in the ease with which the form work can be assembled may result in saving such expense and labor when multiplied by the many repetitions. Therefore, i t is an object of this invention to provide a shoring device for supporting pans, said shoring device being rugged, of comparatively light weight and easy to erect.

It is a further object of this invention to provide an easily erectible shoring device provided with means for quickly adjusting it to proper height. I

Still another object of this invention is to provide a shore headhaving an improved joist rest for temporary supporting joists which govern the depth of the poured concrete joist in the mold by means of slip-in timbers supported between the pans and directly upon said temporary supporting joist. I i

I have found that the above objects and other objects, which can be discerned from reading the following disclosure, are obtained by my novel shore head. My shore head is a device which is intended to be mounted at the upper end of a columnar support, the columnar support and shore head together constituting a shoring device for erecting and temporarily supporting molding pans in a convenient fashion which will be explained further as this specification unfolds. In its broader aspects, my shore head includes a sleeve having upper and lower ends. To bers which project generally upwards, the bracket menibers which project generally upwards, the brackets members being long enough to project above the upper end of the sleeve. To each of the brackets is secured a pan sup, porting quadrant. It will appear from reading subsequent portions of this. disclosure that the word quadrant is used herein to refer not only to the shape which corre-. sponds to the dictionary definition of quadrants, but also other shapes which will adequately serve the intended purpose of the quadrants described herein.

The quadrants are secured to the above-mentioned brackets in such a manner that the quadrants are spaced apart from one another laterally and in such a manner. that the quadrants are substantially perpendicular to the longitudinal axis of the sleeve. On each of the quadrants is some sort of means to secure a molding pan thereto, It will be shown that the invention includes not only shore heads in which all the quadrants are at the same elevation but also shore heads in which one or more quadrants are at a different elevation than the rest.

The shore head is also provided with a joist rest. The joist rest engages the top of the columnar support. It. furnishes a platform or base atop the column which can be used to support joist-depth-controlling members inserted between the adjacent walls of neighboring pans. The joist-depth-controlling members block off an arbitrarily selected portion of the volume between 'pans, thus limiting the depth of the concrete joists which will result when the concrete is poured.

The ordinary, but not necessarily exclusive, mode of fashioning the depth controlling members is to first stand temporary joists on edge across the joist rests so that the upper edge of each temporary joist protrudes upward into the space between the pans; Sofiit members are then installed along the tops of the temporary joists. The soffits lay fiat on the temporary joists and abut the walls of the pans on each side, thus blocking off a portion of the space between the pans and controlling the depth of the concrete joists poured therein.

In various embodiments of my invention, including the embodiment more fully described hereinafter, the sleeve is secured to the column in such a manner that it may adjust upwards and downwards. Thus the height of the quadrants, which are attached to the sleeve, may be varied with respect to that of the joist rest. Such variation of the relative elevations of the quadrants and the joist rest provides a convenient way of adjusting the depth of concrete joist poured in a given set of pans as will be more fully shown hereinafter.

It should be understood that in describing my invention in connection with a suggested mode of using it, I do not intend to limit the invention which actually resides in the shore head itself. The suggested mode of use reflected in the above description is given only for the purpose of 'this invention with the aid of the drawings in which like numerals in the various figures refer to like parts.

In the drawings:

FIGURE 1 is a perspective view of an embodiment of my invention, said embodiment being provided with means for height adjustment.

' FIGURE 2 is a top plan view showing the pattern of pan mounting holes reproduced in each quadrant of the shore head.

FIGURE 3 is a sectional view through the column axis of the shoring device, schematically representing pans on the shore head with a temporary sofiit and joist between said pans and supported by the joist rest.

' FIGURE 4 is a detail of the pan securing means.

FIGURE 5 is a broken top plan view of a dome-type pan specially adapted for use with the shoring device of FIGURES 1-3, showing the four mounting holes in which the pins for securing the pan may be mounted.

FIGURE 6 is a broken side view of the pan shown in FIGURE 5.

FIGURE 7 is a broken detail view of a shore locator in engagement with a quadrant such as is found on my shoring device.

FIGURE 8 is a horizontal section taken through the shore head immediately above the joist rest.

FIGURE 9 is a view of the top of the shore head showing a modified quadrant and pan locating arrangement.

, FIGURE 10 is a sectional view of the modified quadrant with pan-positioning and locking means of FIGURE 9.

FIGURE 11 is a detail view of the shore locator in position in a hole in one quadrant of a shore head.

Referring now to FIGURE 1, the base is a steel plate 10 which rests upon the ground or other surface. At the center of said plate, there is a socket 11 'of a ball and socket connector, the ball portion 13 of said connector being secured to a hexagonal nut 14 through which is passed a bar 15. The ends of the bar protrude a short distance from opposite sides of the nut 14 and serve as a means of hand-turning the nut and a threaded rod 16 secured to said nut and projecting upwards from it. The threaded rod 16 is received in the core of the lower end 'of the column 18 which has corresponding emale threads. The purpose of the nut, protruding bar, threaded rod and corresponding threaded core in the column is, of

course, to provide a means of adjustment in the overall height of the shoring device. Of course, it would be pos sible to do away with this adjusting means and have a plain ball and socket base. It would also be possible to provide a rigid base, or to replace the ball and socket joint with some other joint capable of adapting to slight deviations from a right angle between the floor and the shoring device. However, in most applications, it is desirable to have some flexibility and adjustability between the base and the columns of the shore. Therefore, while I have chosen to illustrate my invention with an embodiment incorporating these features, it should be understood that omission of them does not constitute a departure from the spirit of my invention.

The column illustrated herein by way of example is a tube 18 which has female threads in its bottom end to receive the threaded rod of the adjusting screw. Of course, if some other means of adjustment were resorted to, the lower end of said tube would have to be adapted to properly connect with it.

Along a portion of the length of the tube 18 is a series of spaced apart holes 21 drilled through the tube perpendicular to its longitudinal axis. These holes match a corresponding hole 22 drilled in the sleeve 27, said sleeve 27 being of sufiicient interior diameter to fit over and telescope up and down the tube 13 (in order to provide adjustment of the pan height). A locking pin 23 of a diameter slightly less than the diameter of the holes in the tube 18 and sleeve 27, is provided for insertion through the holes 21 and 22.

Above the sleeve 27 is a quadranted surface 28 disposed in a plane perpendicular to the column for engaging pans supported by the shoring device. Each of said quadrants is supported on sleeve 27 by supports 30. Looking down upon the shore head from the top along a line of sight coinciding with the longitudinal axis of the column as in FIGURE 2, it is to be observed that the quadranted surface 28 consists of four equal partial quadrants 31, 32, 33 and 34, each of the four quadrants being separated from those adjacent it by rectangular spaces, the widths 35 and 36 of which are preferably somewhat larger than the thickness of the wooden planks which are utilized as temporary supporting joists for soffits. Sofiits have been previously used in conjunction with one way joist type pans to control the depth of the concrete joists poured with the aid of such pans. With my shoring device it is not only possible to pour one way joists with sofiits, but even more importantly, it is possible to employ soffits in two way joist construction with domes.

Supporting each of the partial quadrants 31, 32, 33 and 34 is a vertically disposed structural steel angle having sides 30 which are welded along their heel to sleeve 27 so that each angle is separated by of are about the circumference of sleeve 27. Each of the sides 36 is secured beneath its respective quadrant by welding, so that the surface of each side 30 is flush with a straight side 37 of the quadrant and also perpendicular to the lower surface of the quadrant. By virtue of this fact every side 30 is in a plane parallel to the plane occupied by the nearest side 30 on an adjacent quadrant. The space between said parallel sides is of a uniform width which is equal to the distance between the straight sides 37 of adjacent quadrants. The supports are notched, leaving an angled side 40 to give hand room in the space beneath the apex of each quadrant (see FIGURE 1).

In the above description of the shore head, I have described in great detail the spatial relationships which I prefer to maintain between the various quadrants and their supports, since it is believed that the above detailed explanation will aid those who wish to practice my invention in fabricating an embodiment thereof which will perform in accordance with the objects set forth herein. However, it should be emphasized that there would be no departure from the invention in making minor alterations of the shore head such as substituting square plates or tri angular plates for the partial quadrants. Another obvious change which might be made is the replacement of the structural steel angle supports with heavier fiat supports for each quadrant. Although welding is preferred, other well-known means of fastening may be used. The spacing between the quadrants may be altered, to any width which corresponds to the thickness of the temporary wooden supporting joists to be used. Moreover, a shoring device could be constructed in which two of the adjacent quadrants shown in the above description are omitted entirely to make a shore useful for supporting form work along one edge thereof where space might be limited and where the shore would be called upon to support only two pans, thus making the omitted quadrants superfluous. Similarly, a shore device could be constructed having only a single quadrant, said shore device being useful for supporting the corner of the shore work, at which point it would be called upon to support only one corner of a single pan, thus rendering the three omitted quadrants superfluous. None of the abovementioned changes would constitute a departure from the scope of this invention. This application likewise comprehends a shore head in which two adjacent quadrants are at a different elevation than the other two for fabricating form-work having one or more depressed rows of pans.

The joist rest is for use in conjunction with soffits and temporary wooden supporting joists therefor. In this type of form-work, depicted in FIGURE 3. the domes 41 are spaced apart so that a timber functioning as a soffit 42 may be positioned horizontally in the space between the vertical sides of adjacent domes 41. Its purpose is two-fold. The sofiit may be provided with a series of hair-pin anchors 43 which protrude upwardly into the poured concrete. After the concrete has hardened, the soffits are removed, leaving the shanks of the hair-pin anchors protruding downward from the concrete joist to serve as anchoring means for expanded metal lath which will support a plastered ceiling. The second function of the soffits is to mold the bottom of the poured concrete joist, since the sofiit fills upon the entire Width of the space between adjacent domes preventing concrete from leaking past them.

A temporary wooden supporting joist 44 is shown in FIGURE 3. The top edge of the temporary wooden joist engages the underside of the soffit. The joist rest engages the lower edge of the temporary joist. providing temporary support for said joist and said soffit.

The joist rest of this embodiment consists of a cylindrical member 45 telescoped within the supporting column of the shoring device. Said member 45 may befabricated of tubular stock and welded to a cruciform platform 46 which has dimensions such that it just fits in the space between the shore head quadrants 31, 32, 33, 34 and their supports 30. Because of this, the quadrant supports 30 are also able to serve as guides for the joist rest, which is supported upon the upper extremity of the column 18. The joist rest is provided with holes 49 for nailing down the temporary joists.

In each quadrant of tne shoring device is a set of 14 holes driled or punched therein according to a pattern. This pattern is reproduced uniformly in every quadrant of said shoring device, using the projected axis of the column as a reference point. Thus, in every quadrant there are 14 holes, 51-64, each of which has a mate on every other quadrant in exactly the same position. The same pattern of holes is to be reproduced upon every shoring unit in use on the same project. These holes are used in conjunction with locator frames, which are employed in setting up and positioning the shoring and in conjunction with the locking of the domes to the shore heads.

The aforesaid holes fulfill their dome locking function (see FIGURE 4) by serving as receptacles for a down wardly projecting pin 67 on each corner of a every dome 41, said pin occupying the same relative position with respect to its respective corner as is occupied by every other pin on every corner of every dome in use on the same portion of the project. It will be observed that the flange 70 of the dome in FIGURE 5 is drilled in four different places at every corner to provide four different mounting holes A, B, C and D at every corner of each dome for varying the position of the demountable pin 67. FIGURE 6 shows a side elevation of the same dome shown in FIGURE 5, in which holes A, B, C and D are shown in phantom through flange 70.

Proper location of the many shores employed in building up a form-work must be achieved prior to installation of the domes upon the shores. Means are provided for properly locating the shores with respect to one another. Shore locators shown in FIGURES 7 and 11 are provided for use in conjunction with the holes 51-64 in the shore heads 31-34. The frames are preferably fabricated of round bar stock of a diameter slightly less than that of the holes in the quandrants. Two pieces of bar stock 73 and 74- are criss-crossed and welded at their junction point 75. Stiffeners 76 and 77 may be welded on to promote rigidity. The ends of the criss-crossed bars 73 and 74 are bent from the plane of the frame, form'- ing four fingers 81, 82, 83 and 84, which point in the same direction, and which occupy the same position in space with regard to one another as do the four downwardly projecting pins on each of the domes which are to be set up on the shores.

In order to erect the shoring, a workman puts up a bent. A bent is a group of four braced shores. He begins by first erecting one shore and bracing it. Then one of the fingers 83 on the shore locator is placed in a hole 56 in a first shore quadrant 34. A second shore (not shown) is put up using a second finger 82 on the locator frame as a guide. The second finger 82 is secured to the second shore by placing the finger 82 in the hole 56 in one quadrant of said second shore, said hole corresponding to the hoe 56 in quadrant 34, thus maintaining the second shore in proper position. The second shore is then fastened down and braced. The first and second shores, being fastened and braced now rigidly secure the shore locator against motion in a horizontal p ane. With the shore locator held in this manner, it is not at all difficult to correctly position a third and a fourth shore by moving a third shore into position beneath the third finger 81 of the locator frame, inserting finger 81 in the hole 56 of one quadrant on the third shore, fastening down the shore and bracing it, after which the fourth shore may be positioned properly. With the four shores rigidly secured in proper position, more shore locators may be employed to erect additional sets of sho es in rows radiating from the bent until there are enough shores in place to hold the required number of domes.

The pins 67 in the dome flanges 70 are all set in one position, A, B, C, or D, depending on the choice of which quadrant hole shall be used. If quadrant hole 51, S5, 59 or 63 is to be used, the pins are pre-positioned at A (see FIGURES 3 and 5). The pins are moved to. B for hole 52, 56, 60 or 64 or to position C if hole 533, 57 or 61 is to be used. The pins are pre-positioned at D if hole 54 or 58 or- 62 is to be used. Since the holes designated as 56 are being used in this description (see FIGURE 7) all the pins 67 in the dome flanges 70 are pre-positioned at B before the domes are installed. Now each of the shore locators may be rep aced one by one with a dome, inserting each pre-positioned pin 67 in the hole 56 on one quadrant of each of four different shores.

The shore heads have been adjusted to the proper height prior to their erection. This operation was accomplished by removing the pin 23 of FIGURE 1 and raising or lowering the sleeve 27 on tube 18 until the joist rest 46 is at the proper elevation with respect to the quadranted surface 28 and replacing the pin 23..

Because the elevations of the joist rests and the temporary joists resting thereon control the depth of the soffit below the tops of the domes, the elevation of the joist rest with respect to the quadranted surface 28 controls the depth of the poured concrete joist.

Since the erected shores have been properly preadjusted for shore-head height with respect to the joist rest, and the pans have been put in place, temporary supporting joists 44 may be inserted in the spaces between the quadrants 31, 32, 33 and 34. On top of the temporary joists 44 are placed the sofiits 42. The form work is properly positioned for the pouring of concrete. The significance of using a pattern of holes is that it establishes a plurality of fixed positions corresponding to a similar number of dome spacings. By domespacng, I refer to the width between the sides of two adacent domes at flange height. This feature, along with the means explained above for controlling the depth of the soflit, allow the same set of domes to be used for any width and depth concrete joist within the limits inherent in the placement of the holes 51-64 and the scope of adjustment on the joist rest 46. It is also possible to pour joists of full pan depth by utilizing extremely thin soflits of paper, wood, plastic, sheet metal and the like, by presetting the height of the shore heads so that the tops of the temporary joists 44 are flush with the flanges of the pans 41. The thin soflits are simply laid on top of the flat surface presented by the flush flanges and temporary joists therebetween, thus making it possible to utilize substantially the full depth of the joist-forming portions of the pans.

Another advantage of my shoring device is that it makes possible the accurate placement of a set of pans for the pouring of a concrete floor having concrete joists of preselected dimensions without resorting to ordinary means of measurement during the process of erecting the form-work. Since the separation between the pans is controlled by which holes in the quadrants are to receive the pan-securing pins, and since this separation determines the width of the bottom of a concrete joist poured therein, it is possible to list in tabular form the various holes and pin positions corresponding to various concrete joist dimensions. For instance, the following table of values was derived on the basis of a pattern of quadrant holes 51-64 similar to the pattern shown in FIGURE 2. All values in said table are expressed in centimeters. Each consecutively higher hole number corresponds to a lessening of the separation between adjacent pans by 0.50 centimeter, and column III gives the separation between adjacent pans measured pin to pin, if the pin to pin separation is assumed to be 13.40 when the pins are in position A and in holes 51. Numerals in column II identify holes shown in FIGURE 2, and the letters in column I identify the position of the mounting pins 67 in the flanges 70 of the pans, The pitch of the 40 cm. deep pan sides is assumed to be :1 and the center of each of the pins 67 is at a distance of 1.3 centimeters from the nearest wall of its respective pan. If it is desired to pour a concrete floor with joists having a bottom width and a depth corresponding to one of the pairs of dimensions in column IV, it is necessary only to mount the demountable pan-securing pins 67 in the holes in the pan flanges designated by the letter appearing opposite said dimensions in column I. The pans are then secured to the shoring devices by inserting each of the pins 67 in one of the quadrant holes bearing the number found in column III opposite the selected dimensions. When this has been done, the proper separation of pans for a floor with joists of the selected dimensions has been achieved, and the wood joist and soffits may then be installed. Concrete poured in mold-work thus assembled will yield a floor with joists of the preselected dimensions. The arrangement described by this table allows one set of domes to be used in the pouring of 16 different sizes of concrete joist.

I II III IV I Joist Pm positron Hole Pin separadimensions number tion (width times depth) 51 I3. 40 16 X40 52 12. 16x35 53 12. 40 16 30 54 11. 90 16.5X25 55 11. 40 14x40 56 10. 90 14 35 57 10. 40 14 X30 58 9. 90 14. 5X25 59 9. 40 12x40 60 8. 90 12X35 61 8. 40 12X30 62 7. 90 12. 5X25 63 7. 40 10X 10 64 6. 90 10X35 64 6. 90 11x30 64 6. 90 11. 5X25 It should be clearly understood that these values are purely illustrative and are not in the least intended to be limitative, for it is obvious that one could make slight alterations in the position of the holes and pins, or alter the pattern of holes, or both, thus changing the above table of values without departing from the spirit of my invention.

It is also possible to alter the means of securing the pans to the shore heads. Instead of a pattern of holes, a quadrant 91 could be provided with a radial slot 90 along its center-line. Then each pan 41 would be provided with a pin 92 at each corner, said slot being adaptable to receive said pin. Beneath the quadrant 91, a locking plate 93 and wing nut assembly 94 could be provided to restrain the pin at a preselected point along the length of said slot, in which the pin could be secured by a cotter pin, as in the embodiment shown in FIGURE 4. It is apparent that in work of a routine nature, it would be possible to utilize a shoring device retaining the adjustable feature in the joist rest, but in which the pan spacing was non-adjustable. For instance, a single hole could be provided in each quadrant as shown in FIGURE 3, and a single pin could be provided in each pan as shown in FIGURE 9. Or the pin could be placed on the quadrant and the hole in the pan. Or it might be possible to resort to some securing means which employed some other arrangement of pins and holes, or even some type of fastening entirely ditferent from pins and holes. Just from the few illustrative examples given above, it is possible to see how one skilled in the art could make many alterations in the device without departing from the scope of my invention and it is my intention to include within the scope of my invention all such modifications which fall within the scope of the appended claims.

I claim:

1. A shore head suitable for combination with a columnar support to produce a vertical shoring device useful for erecting and supporting molding pans used in systems of joist-type concrete slab construction, said shore head comprising:

(a) a sleeve having upper and lower ends;

(b) four bracket members secured to the exterior of said sleeve and projecting generally upwards, said bracket member being long enough to project above the upper end of said sleeve;

(0) four pan-supporting quadrants, each secured to one of said brackets in a manner such that said quadrants are laterally spaced apart from one another and are all substantially perpendicular to the longitudinal axis of said sleeve;

(d) means on each of said quadrants to secure a molding pan; and

(e) a joist rest, including a generally horizontal surface and a dependent member adapted to engage said columnar support whereby joist-depth controlling members may be supported between said pans at arbitrarily selected elevations.

2. A shore head according to claim 1 wherein said sleeve is telescopically mounted on said columnar support, and locking means are associated with said sleeve whereby a variety of degrees of telescopic extension of said sleeve with respect to said columnar support may be obtained and maintained.

3. A shore head according to claim 2 wherein said sleeve is a tube and said columnar support is a tubular member telescoped within said tube and wherein said joist rest comprises a horizontal cross and a vertically disposed support member secured to said cross and depending therefrom to engage said tubular member.

4. A shore head according to claim 1 wherein said securing means on said quadrants each include radially disposed slots and locking plate means cooperatively associated therewith.

5. A shore head according to claim 1 wherein said securing means on said quadrants each include a plurality of pin receiving apertures in each quadrant, said apertures being located at progressively greater distances from the axis of said sleeve.

6. A shore head suitable for combination with a columnar support to produce a vertical shoring device useful for erecting and supporting molding pans used in systems of joist type concrete slab construction, said shore head comprising:

(a) a cylindrical sleeve having upper and lower ends;

(b) four bracket members secured to the exterior of said sleeve and projecting above said upper end;

() four pan-supporting quadrants, each secured to one of said brackets in a manner such that said quadrants are laterally spaced apart from one another and are all substantially perpendicular to the longitudinal axis of said sleeve;

(d) means on each of said quadrants to secure a molding pan thereto;

(e) means for locking said sleeve at diiferent heights on said columnar support, with said columnar support being telescopically received within said sleeve; and

(f) a joist rest including a generally horizontal cross member and a vertically disposed dependent support member therefor, said support member engaging said columnar support and said cross member being of lesser dimensions than the spacings between said quadrants, whereby joist-depth controlling members may be supported at varying relative elevations with respect to said quadrant surfaces, by adjusting the position of said sleeve upwards and downwards on said columnar support.

7. A shore head according to claim 6 wherein said sleeve is tubular.

References Cited in the file of this patent UNITED STATES PATENTS 1,258,409 Hill Mar. 5, 1918 1,719,528 Beckley et a1. July 2, 1929 2,257,196 Schneider Sept. 30, 1941 2,775,019 Bemis Dec. 25, 1956 2,894,312 Jones et al. July 15, 1959 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No 3,,O70 34l December 25 1962 Hugh Shannon Morrison It is hereby certified that error appears in the above numbered patent requiring correction and that the said Letters Patent should read as corrected below.

Column 2, line 40 after ""To insert the exterior of the sleeve are secured four bracket mem- 3 line 42 strike out "hers which project generally upwards the brackets mem-"H Signed and sealed this 23rd day of July 1963,

(SEAL) Attest:

ERNEST w. SWIDER DAVID LADD Attesting Officer Commissioner of Patents

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