US2684824A

US2684824A - Adjustable brace

Info

Publication number: US2684824A
Application number: US288839A
Authority: US
Inventors: Hillberg Bror
Original assignee: Superior Concrete Accessories Inc
Current assignee: Superior Concrete Accessories Inc
Priority date: 1952-05-20
Filing date: 1952-05-20
Publication date: 1954-07-27
Anticipated expiration: 1971-07-27

Description

July 27, 1954 a. 'HILLQBERG ADJUSTABLE BRACE s Sheets-Sheet 1 Filed May 20, 1952' July 27, 1954 B. HILLBERG ADJUSTABLE BRACE 5 Sheets-Sheet 2 Filed May 20, 1952 July 27, 1954 B. HILLBERG ADJUSTABLE BRACE 3 Sheets-Sheet 3 Filed May 20, 1952 Patented July 27, 1954 ADJUSTABLE BRACE Bror Hillberg,

Chicago, Ill., assignor to Superior Concrete Accessories, Inc, Chicago, 111., a corporation of Illinois Application May 20, 1952, Serial No. 288,839

The present invention relates generally to adjustable braces. More particularly the invention relates to that type of brace which is adapted for use in connection with the construction of a concrete building, serves, after a wall slab is placed neXt to a floor slab by a crane or like hoisting mechanism, to hold the wall slab in position while it is being secured in place, consists of a bracket with means for detachably securing it to the inner surface of the wall slab, a bracket with means for detachably securing it to the top surface of the floor slab, and a straight inclined or diagonally disposed strut between the two brackets, and has means whereby it may be longitudinally adjusted in order that the wall slab may be tilted outwards or inwards into any desired angular position with respect to the floor slab as a preliminary to securing it in place.

In connection with construction of a concrete building it is now common practice at the site of the building to form on the usual fill at the site a rectangular horizontally extending frame, then to pour concrete into the bottom portion of the frame interior for floor slab forming purposes, then to overlie the poured concrete with a film or layer of ncnadhesive material, and finally to pour concrete into the upper portion of the frame interior for wall slab forming purposes. After hardening or setting of the concrete and removal of the mold forming frame the concrete wall slab is swung upwards and manipulated into an upstanding position next to one edge of the fioor slab. After proper positioning of the wall slab the latter is suitably secured in place. The aforementioned practice or technique is inexpensive but requires the use of a brace of the aforementioned type in order to hold the wall slab in the desired angular position with respect to the floor slab while it is being secured in place.

One object of this invention is to provide an adjustable brace of the type under consideration which is an improvement upon, and has certain inherent advantages over, previously designed or proposed braces for the same purpose and is characterized by high efficiency and strength, facility of longitudinal adjustment and low cost of fabrication.

Another object of the invention is to provide an adjustable brace of the aforementioned type in which the wall slab engaging bracket is of simple and novel design and is connected to the upper end of the strut by a horizontal pivot element in order that it and the strut are capable of tilting relatively to one another in a vertical plane.

Another object of the invention is to provide 8 Claims. (Cl. 248354) an adjustable brace of the type under consideration in which the floor slab engaging bracket consists of a bottom member, a pair of spaced apart upwardly inclined side members at opposite sides of the bottom member, and a tiltable collar between the upper ends of the side members, and the means for efiecting longitudinal adjustment of the brace consists of 1) an elongated externally threaded element which is connected to the lower end of the strut, extends slidably through the tiltable collar and is in parallel relation with the strut, and (2) two wing nuts which are mounted rotatably on the elongated externally threaded element, are positioned at opposite sides of the collar and are so arranged that when the uppermost nut is tightened, after loosening of the lowermost nut, it causes the strut to slide upwards and effect outward tilting of the wall slab and when the lowermost nut is tightened, after loosening of the uppermost nut, it causes the strut to slide downwards and elfect inward tilting of the wall slab.

A further object of the invention is to provide an adjustable brace of the type and character under consideration in which the strut is so constructed that it possesses great durability and strength and the upper end of the elongated externally threaded element is connected to the lower end of the strut in a novel and simple manner.

A still further object of the invention is to provide an adjustable brace which is generally of new and improved construction and effectively and eflicicntly fulfills its intended purpose.

Other objects of the invention and the various advantages and characteristics of the present brace will be apparent from a consideration of the following detailed description.

The invention consists in the several novel fea tures which are hereinafter set forth and are more particularly defined by claims at the conclusion hereof.

In the drawings which accompany and form a part of this specification or disclosure and in which like numerals of reference denote corresponding parts throughout the several views:

Figure 1 is a perspective showing an adjustable brace embodying the invention in operative relation with a concrete wall slab and a concrete floor slab after placement of the wall slab next to the floor slab by an overhead crane;

Figure 2 is a fragmentary side elevation of the brace, the floor slab engaging bracket of the brace P being shown in section for illustrative purposes;

Figure 3 is a perspective of the wall slab engaging bracket;

Figure 4 s a perspective of the metallic plate which is connected to the upper end of the strut and together with the horizontal pivot element serves tiltably to connect the upper end of the strut to the wall slab engaging bracket;

Figure 5 is an enlarged transverse section taken on the line 55 of Figure 2;

Figure 6 is a fragmentary plan view of the brace, certain parts of the aforementioned metallic plate and the wall slab engaging bracket being shown in section for purposes of illustration;

Figure '7 is a perspective of the floor slab engaging bracket of the brace;

Figure 8 is a perspective of the elongated. externally threaded element constituting a part of the means for eifecting longitudinal adjustment of the brace; and

Figure 9 is a perspective of the tiltable collar and the two wing nuts.

The adjustable brace that is illustrated in the drawings constitutes the preferred form or embodiment of the invention. it is adapted for use in connection with a fi-OOZ' slab iii and a wall slab ii and serves, as described hereafter more in detail, to hold the wall slab ii in an upright position next to the floor slab While it is being secured in place in connection with the construction or formation of a concrete building. The fioor slab i9 is shown as resting on a fill or foundation l2 at the site where the building is to be erected. It is contemplated that in connection with fabrication of the building a rectangular horizontally extending frame (not shown) will be placed on the fill i2. After the frame is suitably secured or anchored in place concrete in plastic form is poured into the bot-- tom portion of the frame interior in order to form the floor slab iii. After pouring of the concrete for such slab a film or layer of nonadhesive material is applied to the top surface of the concrete. Thereafter concrete is poured into the upper portion of the frame interior in order to form the wall slab ll. Directly after pouring the concrete for the wall slab four bracket-like attaching members i3 are embedded in the corner portions of the-upper surface of the wall slab. After hardening or setting of the concrete for the two slabs the wall slab is connected by way or a harness i i to a cable supported hook equipped block 55 on a crane or other hoisting mechanism (not shown). As shown in Figure l, the harness it comprises a rigid horizontally extending harness member is and a pair of depending cables ll at the ends of the member. The harness member it is provided with a cable arrangement 53 whereby it is connected to the hook on the block it The central portions of the cables ll extend around depending sheaves is on the ends of the harness member 56 and the ends of such cables are provided with eye-bolts or clevises 20 whereby they may be connected to the bracket-like attaching mem bers IS on the corner portions of the wall slab l After the wall slab l l is attached to the hook equipped block it by the hardness i l it is first lifted by the aforementioned crane or other hoisting mechanism and then tilted into a substantially vertical position. After the tilting operation the wall slab is manipulated so as to position its bottom marginal portion in abutting relation with one of the side marginal portions of the floor slab, as shown in Figure l of the drawings. The wall slab H is provided with an anchoring device 2i and the floor slab it: is pro- Vided with an anchoring device 22. The anchoring device 2! comprises a nut-like member 23 and a lag screw 24 and is located at the upper portion or the wall slab when the latter is in its wall forming position. The nut-like member 23 is in the form of a wire helix. It is embedded in the wall slab directly inwards of the latters inner surface and embodies a plurality of L- shaped heavy wire legs 25 whereby it is maintained in firmly interlocked. relation with the concrete in which it is embedded. The lag screw 2 is arranged so that the threaded shank thereof is in screw threaded relation with the interior of the nutlike member 23 and its head is disposed a small distance away from the inner surface of the wall slab ii. It is contemplated that the nut-like member 23 of the anchoring device 2! will be embedded in the wall slab at the time the concrete for the latter is poured and that the lag screw E l will be connected to the nut-like member 23 after the wall slab is manipulated into its upstanding position as hereinbefore described. The anchoring device 22 comprises a nut-like member 26 and a lag screw 27 and is located at the central portion of the floor slab iii and in substantially the same vertical plane as the anchoring device ft. The nut-like member 26 is in the form of a wire helix. It is embedded in the floor slab directly beneath the top surface thereof and embodies a plurality of irregularly shaped heavy wire legs 28 whereby it is maintained in firmly interlocked relation with the concrete in which it is embedded. The lag screw 2'! is arranged so that the threaded shank thereof is in screw threaded relation with the interior of the nut like member 26 and its head is disposed a small distance above the top surface of the floor slab it. It is contemplated that the nutlike member 26 of the anchoring device 22 will be embedded in the floor slab at the time the concrete for the latter is poured and that the lag screw 2? will be connected to the nut-like member 2s after the Wall slab l l is manipulated into its upstanding position.

The brace is of unitary character and as its main components or parts comprises a wall slab engaging bracket 29, a floor slab engaging bracket 3i an inclined or diagonally disposed strut 3i between the two brackets and an adjustable connection 32 between the bracket 36 and the lower end of the strut 3 I.

The wall slab engaging bracket 29 is formed of steel or other suitable metal and comprises a flat rectangular vertically extending part 33 and a flat rectangular vertically extending part 34 at right angles to the part 33. The last mentioned part is adapted to fit flatly against the inner surface of the Wall slab ii and has in the upper portion of one side margin thereof a horizontally extending notch 35 for receiving the head-equipped end of the shank of the lag screw 2- 3, as best shown in Figure 6. The part 34. of the bracket 25 is connected to, and formed integrally with, the other side margin of the part 33. It projects away from the wall slab when the bracket 29 is in its operative position and embodies in its lower portion a hole 35. The latter, as shown in Figures 2 and 3, is disposed beneath the notch 35 in the bracket part 33. In connection with use of the brace after the wall slab is initially manipulated into place by the crane or other hoisting mechanism, the lag screw 24 of the anchoring device 2! is turned so as to shift it outwards to a limited extent with respect to the nutlike member 23. Thereafter the part 33 of the bracket 29 is placed against the inner surface of the wall slab H and is slid laterally until the head-equipped end of the shank of the lag screw 24 is seated in the notch 35. Thereafter the lag screw 24 is tightened until the bracket 29 is firmly clamped against the inner surface of the wall slab. The anchoring device 2| constitutes means for detachably clamping or securing the bracket 29 against the inner surface of the wall slab.

The floor slab engaging bracket 35} is formed of steel or other suitable metal and consists of a rectangular bottom member 37, a pair of spaced apart upwardly inclined side members 38 at opposite sides of the bottom member, and a collar 39. The bottom member 3i is of plate-like character and is adapted when in its operative position and viewed from above to extend at right angles to the wall slab l I and has in the end portion thereof that is nearer to the wall slab a laterally extending notch 40 for receiving the head-equipped end of the lag screw 21 of the anchoring device 22. In connection with use of the brace the lag screw 2'! is loosened to a small extent and then the bottom member 31 of the bracket 38, after being placed on the top surface of the floor slab Hi, is manipulated and shifted laterally in order to bring the head-equipped end of the lag screw 27 into seated relation with the notch 4U. Thereafter the lag screw is tightened in order firmly to clamp the bottom member 31 of the bracket 30 against the top surface of the floor slab. The anchoring device 22 constitutes means for detachably securing or clamping the bracket 39 to the top surface of the floor slab. The spaced apart side members 38 of the floor slab engaging bracket 39 are of strip-like character and are up wardly inclined in a direction away from the wall slab engaging bracket 29. The lower ends of the side members fit against, and are welded to, the end portions of the side edges of the bottom memher 3'! that are remote from the laterally extending notch 4d. The upper ends of the side mam here 38 are provided with aligned or coaxial transversely extending holes ll. The collar 35-3 is disposed between the upper ends of the side members 38 and embodies at the sides thereof integral outwardly extending coaxial trunnions 42 which are journalled in the holes ll and support the collar so that it is capable of tilting back and forth about a horizontal axis.

The strut 3| is upwardly inclined in the direcion of the wall slab H the brace is in its operative position and comprises a pair of coextensive side by side but laterally spaced wooden bars Q3. The latter are preferably in the form of 2 x 4s and are maintained in spaced apart relation by way of a series of equidistantly spaced wooden spacer strips 4'4 between the central portions of the inner or opposed side surfaces of the bars. Horizontally extending nut equipped l-OItS 45 extend through aligned transverse holes 46 in the bars 43 and serve to hold the bars in connected relation. In addition to the wooden bars 53 the strut 3| comprises an elongated metal- 118 plate 41. One end portion of this plate fits between the upper ends of the bars 43 and is secured in place by way of the two uppermost bolts 45. The central portions of the shanks of such bolts extend through holes 48 in said one end portion of the plate 4?. The other end portion of the plate projects beyond the end surfaces of the bars 43, fits against the lower portion of the part 34 of the wall slab engaging bracket 29 and is provided with a transverse circular hole 49 which is the same in size as, and registers with, the hole 36 in the bracket part 34. A pivot element 50 extends through the holes 36 and 49 and serves so to connect the bracket 29 and the upper end of the strut as to permit the latter to tilt relatively to one another in a vertical plane. Preferably the pivot element 50 is in the form of a rivet in order that it remains permanently in place. The end portion of the plate 41 that is clamped between the upper nds of the wooden bars 43 of the strut has the bottom edge thereof welded to the central portion of a transversely extending metallic strip 5|. As shown in Figure 5, the end portions of the strip 5| underlie the upper ends of the bars 43. Two nut equipped bolts 52 extend through holes 53 in the upper ends of the bars 43 and holes 54 in the end portions of the strip 5| and serve to hold said upper ends of the bars and the end portions of the strip in clamped relation.

The adjustable connection 32 of the brace com prises an elongated externally threaded element 55 and a pair of wing nuts 56 and 51. The element 55 is preferably in the form of a metallic tube and is connected to the lower end of the strut 3| by a metallic plate structure 58. It is disposed in parallel relation with the strut and. extends slidably through the tiltable collar 39. The metallic plate structure 58 is of unitary character and consists of a transversely extending plate 59, a longitudinally extending plate 5E and a transversely extending plate 6|. The The transversely extending plate 59 is welded to the upper end of the externally threaded element 55 and abuts directly against the lower end surfaces of the wooden bars 43. The longitudinally extending plate 60 fits between the lower ends of the bars 43 and has the lower end por-- tion thereof welded to the central portion of the transversely extending plate 59. The two lowermost bolts 45 extend through holes 62 in the longitudinally extending plate to and serve to hold the plate structure 58 in connected relation with the lower ends of the wooden. bars 43. The transversely extending plate 6| underlies the lower ends of the bars 43 and has its central portion Welded to the central portion of the lower edge of the longitudinally extending plate 69. Nut equipped bolts $3 extend through holes 66 in the lower ends of the bars 43 and holes 55 in the end portions of the transversely extending plate El and coast with the two lowermost bolts 45 fixedly to connect the plate structure 58 to the lower end of the strut 3|, The wing nuts 55 and 51 are mounted rotatably on the externally threaded element 55 and are positioned at opposite sides of the tiltable collar 39. The nut 58 located on the upper side of the collar and consists of a wire helix 66 and four L-shaped wings 57. The wings 5'! are disposed apart. They are preferably formed of metallic rods and cor1- sist of parts 58 and right anglehandle forming parts 69. The parts 63 of the wings extend lengthwise of the wire helix 66 and are welded to the outer periphery thereof. The right angle handle forming parts 69 are connected to, and extend outwards from, the upper ends of the parts 68. The inner periphery of the wire helix 66 forms an internal screw thread which is in threaded relation with the external screw thread on the elongated element When the wing nut 56 is turned so that it feeds downwards with respect to the element 55 it operates to slide the strut 3| upwards in a direction lengthwise of the strut. The nut 51 is located on the lower side of the collar 3% and consists of a wire helix l8 and four L-shaped wings ll. The wings ii are disposed 90 apart. They are preferably formed of metallic rods and consist of parts 12 and right angle handle forming parts it. The parts #2 of the wings Tl extend lengthwise of the wire helix ill and are welded to the outer periphery thereof. The right angle handle forming parts it are connected to, and extend out wards from, the lower ends of the parts 12. The inner periphery of the wire helix iii forms an internal screw thread which is in threaded rela" tion with the external screw thread on the elongated element 55. When the wing nut El is turned so that it feeds upwards with respect to the element 55 it operates to slide the strut 3i downwards in a direction lengthwise of the strut.

When, after manipulation of the wall slab H into the position shown in Figure l of the draw ings, it is desired to use the brace the bracket 29 is connected to the anchoring device 2i and the bracket 3!) is connected to the anchoring device 22 as heretofore described. As soon as the lag screws 24 and 2? are tightened the brace holds the wall slab H in fixed relation with the door slab it. If it is desired, as a preliminary to permanently securing the wall slab in place, to tilt the wall slab outwards, the wing nut is first loosened and thereafter the wing nut 56 is turned so as to feed it downward with respect to the externally threaded element 55. Such turning movement on the part of the wing nut it results in the strut 3| sliding upwards and effecting outward tilting of the wall slab. As

soon as the wall slab is tilted outwards to the desired extent the wing nut 5? is tightened against the lower side of the collar 39 in order positively but releasably to lock the strut in place. In the event it is desired to tilt or swing the wall slab inwards the wing nut 55 is loosened and the wing nut til is turned in such direction as to cause it to feed upwards with respect to the externally threaded element 55. Such turning movement on the part of the wing nut ii'i results in the strut 3i sliding downwards and eifecting inward tilting of the wall slab. As soon as the wall slab is tilted inwards to the desired extent the wing nut 55 is tightened against the upper side of the collar 39 so that it serves with the wing nut 5'5 securely but releasably to lock the strut against longitudinal displacement or movement. In connection with sliding movement of the strut by turning of the wing nuts the pivot element lit permits the upper end of the strut to tiit relatively to the wall slab engaging bracket and the collar 39 permits the lower end of the strut to tilt vertically relatively to the floor slab engaging bracket iii.

The herein described adjustable brace effectively and efficiently fulfills its intended purpose and, due to its particular construction, may be fabricated or produced at a comparatively low cost. It is both strong and durable and may be adjusted with facility due to the specific construction and design of the adjustable connection 32 consisting of the elongated externally threaded element 55 and the wing nuts 56 and 5?.

The invention is not to be understood as restricted to the details set forth since these may be modified within the scope of the appended claims without departing from the spirit and scope of the invention.

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

1. As a new article of manufacture, an adjustable brace adapted, after a wall slab is placed next to a fioor slab in connection with the construction of a concrete building, to hold the wall slab in position while it is being secured in place and comprising a first bracket provided with means for detachably securing it to the inner surface of the wall slab at a location above the floor slab, a second bracket provided with means for detachably securing it to the top surface of the door slab at a location away from the wall slab and embodying a collar mounted to tilt freely about a horizontal axis, a rigid upwardly inclined strut having horizontal pivot means between its upper end and the first bracket whereby it and said first bracket are free to tilt relatively to one another in a vertical plane, and an adjustable connection extending between the second bracket and the lower end of the strut and consisting of an elongated upwardly inclined externally threaded element extending through the collar, disposed in parallel relation with the strut, and having the upper end thereof connected fixedly to the lower end of the strut, and nut means mounted rotatably on the element and arranged in coacting relation with the collar, said connection being adapted when the nut means is turned in one direction so to coact with the collar as positively to slide the element and strut longitudinally in one direction with respect to the second bracket and when the nut means is turned in the opposite direction so to coast with said collar as positively to slide the element and strut longitudinally in the opposite direction with respect to said second bracket.

2. As a new article of manufacture, an adjustable brace adapted, after a wall slab is placed next to a floor slab in connection with the con struction of a concrete building, to hold the wall slab in position while it is being secured in place and comprising a first bracket provided with means for detachably securing it to the inner surface of the wall slab at a location above the door slab, a second bracket provided with means for detachably securing it to the top surface of the floor slab at a location away from the wall slab and embodying a collar mounted to tilt freely about a horizontal axis, a straight rigid upwardly inclined strut having horizontal pivot means between its upper end and the first bracket whereby it and said first bracket are free to tilt relatively to one another in a vertical plane, and an adjustable connection extending between the second bracket and the lower end of the strut and consisting of an elongated upwardly inclined externally threaded element extending slidably through the collar, disposed in parallel relation with the strut, and having the upper end thereof connected fixedly to the lower end of the strut, and a pair of wing nuts mounted rotatably on the element and disposed on opposite sides of the collar, said connection being adapted when one of the nuts is tightened against the collar after loosening of the other nut positively to slide the element and strut 1ongitudinally in one direction with respect to the second bracket and when the other nut is tightened against the collar after loosening of said one nut positively to slide the element and strut longitudinally in the opposite direction with respect to said collar.

3. As a new article of manufacture, an adjustable brace adapted, after a wall slab is placed next to a floor slab in connection with the construction of a concrete building, to hold the wall slab in position while it is being secured in place and comprising a first bracket provided with means for detachably securing it to the inner surface of the wall slab at a location above the floor slab, a second bracket provided with means for detachably securing it to the top surface of the floor slab at a location away from the wall slab and consisting of a bottom member, a pair of spaced apart upwardly extending side members with aligned holes at their upper ends and a collar disposed between the side members and having at the sides thereof horizontal trunnions journalled in said holes and serving to support the collar so that it is free to tilt about a horizontal axis, a rigid upwardly inclined strut having horizontal pivot means between its upper end and the first bracket whereby it and said first bracket are free to tilt relatively to one another in a vertical plane, and an adjustable connection extending between the second bracket and the lower end of the strut and consisting of an elongated upwardly inclined externally threaded element extending through the collar, disposed in parallel relation with the strut and having the upper end thereof connected fixedly to the lower end of said strut, and nut means mounted rotatably on the element and arranged in coacting relation with the collar, said connection being adapted when the nut means is turned in one direction so to coact with the collar as positively to slide the element and strut longitudinally in one direction with respect to the second bracket and when the nut means is turned in the opposite direction so to coact with the collar as positively to slide the element and strut longitudinally in the opposite direction with respect to said second bracket.

4. As a new article of manufacture, an adjustable brace adapted, after a wall slab is placed next to a floor slab in connection with the construction of a concrete building, to hold the wall slab in position whil it is being secured in place and comprising a first bracket provided with means for detachably securing it to the inner surface of the wall slab at a location above the floor slab, a second bracket provided with means for detachably securing it to the top surface of the floor slab at a location away from the wall slab and consisting of a bottom member, a pair of spaced apart upwardly extending side members with aligned holes at their upper ends and a collar disposed between the side members and having at the sides thereof horizontal trunnions journalled in said holes and serving to support the collar so that it is free to tilt about a horizontal axis, a rigid upwardly inclined strut having horizontal pivot means between its upper end and the first bracket whereby it and said first bracket are free to tilt relatively to one another in a vertical plane, and an adjustable connection extending between the second bracket and the lower end of the strut, consisting of an elongated upwardly inclined externally threaded element extending slidably through the collar, disposed in parallel relation with the strut, and having the upper end thereof connected fixedly to the lower end of the strut, and a pair of wing nuts mounted rotatably on the element, disposed on opposite sides of the collar and consisting of wire helixes and L-shaped wings fixed to the other peripheries of the helixes, said connection being adapted'when one of the nuts is tightened against the collar after loosening of the other nut positively to slide the element and strut longitudinally in one direction with respect to the second bracket and when the other nut is tightened against the collar after loosening of said one nut positively to slide the element and strut longitudinally in the opposite direction with respect to said second bracket.

5. As a new article of manufacture, an. adjustable brace adapted, after a wall slab is placed next to a floor slab in connection with the construction of a concrete building, to hold the wall slab in position while it is being secured in place and comprising a first bracket provided with for detachably securing it to the inner surface of the wall slab at a location above the floor slab, and embodying a part extending inwards at right angles to the wall slab, a second bracket provided with means for detachably securing it to the top surface of the floor slab at a location away from the wall slab and embodying a collar mounted to tilt freely about a horizontal axis, a rigid upwardly inclined strut comprising a pair of side by side spaced apart bars and an elongated plate having one end portion thereof clamped between the upper ends of the bars and its other end portion projecting thereabove, a horizontal pivot element extending transversely through said part of the first bracket and said other end portion of the plate and forming a pivotal connection whereby said first bracket and the upper end of the strut are permitted to tilt relatively to one another in a vertical plane, and an adjustable connection extending between the second bracket and the lower end of the strut, consisting of an elon gated upwardly inclined externally threaded ele ment extending through the collar disposed in parallel relation with the strut and having the upper end thereof connected fixedly to the lower end of the strut, and nut means mounted rotatably on the element and arranged in coacting relation with the collar said connection being adapted when the nut means is turned in one direction so to coact with the collar as positively to slide the element and strut longitudinally in one direction with respect to the second bracket and when the nut means is turned in the opposite direction so to coact with said collar as positively to slide the element and strut longitudinally in the opposite direction with respect to said second bracket.

6. As a new article of manufacture, an adjustable brace adapted, after a wall slab is placed next to a floor slab in connection with the construction of a concrete building, to hold the wall slab in position while it is being secured in place and comprising a first bracket provided with means for detachably securing it to the inner surface of the wall slab at a location above the floor slab, a second bracket provided with means for detachably securing it to the top surface of the floor slab at a location away from the wall slab and embodying a collar mounted to tilt freely about a horizontal axis, a rigid upwardly inclined strut having horizontal pivot means between its upper end and the first bracket whereby it and said first bracket are fre to tilt relatively to one another in a vertical plane and comprising a pair of side by side spaced apart bars, and an adjustable connection extending between the second bracket and the lower end of the strut, consisting of an elongated upwardly inclined externally threaded element extending through the collar and provided at its upper end with a longitudinally extending plate fitting between, and in clamped relation with, the lower ends of the bars, and nut means mounted rotatably on the element and arranged in coacting relation with the collar, said connection being adapted when the nut means is turned in one direction so to coact with the collar as positively to slide the element and strut longitudinally in one direction with respect to the second bracket and when the nut means is turned in the opposite direction so to coact with the collar as positively to slide the element and strut longitudinally in the opposite direction with respect to said second bracket.

7. As a new article of manufacture, an adjustable brace adapted, after a wall slab is placed next to a floor slab in connection with the construction of a concrete building, to hold the wall slab in position while it is being secured in place and comprising a first bracket provided with means for detachably securing it to the inner surface of the wall slab at a location above the fioor slab and embodying a part extending inwards at right angles to the wall slab, a second bracket provided with means for detachably securing it to the top surface of the floor slab at a location away from the wall slab and embodying a collar mounted to tilt freely about a horizontal axis, a rigid upwardly extending strut comprising a pair of side by side spaced apart bars and an elongated plate having one end portion thereof clamped between the upper ends of the bars and its other end projecting therebeyond, a horizontal pivot element extending transversely through said part of the first bracket and said other end portion of the plate and forming a pivotal connection whereby said first bracket and the upper end of the strut are permitted to tilt relatively to one another in a vertical plane, and an adjustable connection extending between the second bracket and the lower end of the strut and consisting of an elongated upwardly inclined externally threaded element extending through the collar, disposed in parallel relation with the strut, and provided at its upper end with a longitudinally extending plate fitting between, and in clamped relation with, the lower ends of the bars, and nut means mounted rotatably on the element and arranged in coacting relation with the collar, said adjustable connection being adapted when the nut means is turned in one direction so to coact with the collar as positively to slide the element and strut longitudinally in one direction with respect to the second bracket and when the nut means is turned in the other direction so to coact with said collar as positively to slide the element and strut longitudinally in the opposite direction with respect to said second bracket.

8. As a new article of manufacture, an adjustable brace adapted, after a wall slab is placed next to a iioor slab in connection with the construction of a concrete building, to hold the wall slab in position while it is being secured in place and comprising a first bracket provided with means for detachably securing it to the inner surface of the wall slab at a location above the floor slab and embodying a part extending inwards at right angles to the wall slab, a second bracket provided with means for detachably securing it to the top surface of the floor slab at a location away from the wall slab and consisting of a floor slab engaging bottom member, a pair of spaced apart upwardly extending side members with aligned holes in their upper ends and a collar disposed between the side members and having at the sides thereof horizontal trunnions journalled in said holes and serving to support the collar so that it is free to tilt about a horizontal axis, a straight rigid upwardly inclined strut comprising a pair of side by side spaced apart bars and an elongated plate having one end portion thereof clamped between the upper ends of the bars and its other end portion projecting therebeyond, a horizontal pivot element extending transversely through said part of the first bracket and said other end portion of the plate and forming a pivotal connection whereby said first bracket and the upper end of the strut are permitted to tilt relatively to one another in a vertical plane, and an adjustable connection extending between the second bracket and the lower end of the strut and consisting of an elongated upwardly inclined externally threaded tubular element extending slidably through the collar and provided at its upper end with a fixed longitudinally extending plate fitting between, and in clamped relation with, the lower ends of the bars, and a pair of wing nuts mounted rotatably on the element, disposed on opposite sides of the collar and con sisting of wire helixes and L-shaped wings fixed to the outer peripheries of the helixes, said adjustable connection being adapted when one of the nuts is tightened against the collar after loosening of the other nut positively to slide the element and strut longitudinally in one direction with respect to the second bracket and when the other nut is tightened against the collar after loosening of said one nut positively to slide the element and strut longitudinally in the opposite direction with respect to said second bracket.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 578,594 Bond Mar. 9, 1897 2,259,378 Heidkamper Oct. 14, 1941 2,388,308 Court Nov. 6, 1945 2,436,799 Frost Mar. 2, 1948'