Abstract:
A metal fitting for fixing a precast concrete board comprises: a supporting metal member with one end portion secured to the board and with the other end portion provided with a first screw to move the board upward and downward through the supporting metal member and a second screw to move the board backward and forward through the supporting metal member; and an adjusting metal member including a base board which is secured to a building&#39;s structure, and a pair of third screws for moving the board rightward and leftward through the supporting metal member, so that the position adjustments of the board in the three directions can be achieved independently of one another.

Description:
A precast concrete board fixing metal fitting characterized by the provision of a support metal member including at one side portion an upward and downward adjusting screw extending vertically therethrough and a horizontally forward and backward adjusting screw having at least two nuts threaded thereon, and means provided at the other side portion for fastening said support metal member to the precast concrete board; and an adjusting metal member including upstanding plates mounted on a base board, horizontally securable to a building structure, at three side portions thereof except for that side portion confronting the precast concrete board, said plate confronting thhe precast concrete board having a notch extending from its upper portion, rightward and leftward adjusting screws of which distal ends are opposed to each other extending respectively through said right- and left-side plates, disposed perpendicular to the precast concrete board. 
     DETAILED DESCRIPTION OF THE INVENTION 
     1. Field of Industrial Utility 
     This invention relates to a metal fitting for fixing a precast concrete board (hereinafter referred to as &#34;PC board&#34;) to a building structure. 
     2. Prior Art 
     In most of the conventional PC board fixing metal fittings, for example, as disclosed in Japanese Utility Model Application (OPI) Nos. 134209/1977, 155806/1978 and 40507/1982, through holes are formed through a flange of an L-shaped metal part which is protruded horizontally from a surface of the PC board, and it is adapted to be fixed to a metal member, secured to a building structure such as a beam, by the use of bolts vertically inserted into the through holes. 
     PROBLEMS TO BE SOLVED BY THE INVENTION 
     In the installation of the PC board using the conventional fixing metal fittings, the adjustments of the vertically-disposed board in an upward/downward direction, a rightward/leftward direction parallel to the board surface and a forward/backward direction perpendicular to the board surface can not be made independently of one another. And, even in the case where the adjustment in one direction is only needed, the adjustments in all the directions have been required to be made from the beginning. 
     Therefore, the installation of the PC board using the conventional fixing metal fittings has required a lot of time and labor. 
     An object of this invention is to overcome the above problems of the prior art and to provide a fixing metal fitting which enables an easy adjustment of the position of a PC board when installing the PC board, thereby improving an installation efficiency. 
     MEANS FOR SOLVING THE PROBLEMS 
     This invention has been made in order to achieve the above object and is characterized by the provision of a support metal including at one side portion an upward and downward adjusting screw extending vertically therethrough and a horizontally forward and backward adjusting screw having at least two nuts threaded thereon, and means provided at the other side portion for fastening the support metal member to the precast concrete board; and an adjusting metal member including upstanding plates mounted on a base board, horizontally securable to a building structure, at three side portions thereof except for that side portion confronting the precast concrete board, the plate confronting the precast concrete board having a notch extending from its upper portion, rightward and leftward adjusting screws of which distal ends are opposed to each other extending respectively through the right- and left-side plates, disposed perpendicular to the precast concrete board. 
     OPERATION 
     The support metal member, which is fastened at the other side portion to the PC board and has the upward and downward adjusting screw and the forward and backward adjusting screw having at least two nuts threded thereon both of which screws are threadedly connected to the support metal at the one side portion thereof, is placed on the base board between the opposed distal ends of the rightward and leftward adjusting screws of the adjusting metal member in such a manner that the forward and backward adjusting screw is received in the notch formed in the plate confronting the PC board with the two nuts disposed respectively on the front and rear sides of the plate. 
     Then, the position adjustment in the vertical direction is carried out by turning the upward and downward adjusting screw. And, the position adjustment in the rightward/leftward direction is carried out by turning the rightward and leftward adjusting screws. Further, the position adjustment in the forward/backward direction is carried out by turning the nuts on the forward and backward adjusting screws to position the PC board in place, and the support metal member is clamped between the rightward and leftward adjusting screws, thereby firmly fixing the PC board in position relative to the building structure. 
    
    
     EMBODIMENT 
     The invention will now be described in detail by way of one embodiment thereof. 
     FIG. 1 is a plan view of one embodiment of this invention. 
     FIG. 2 is a partly cross-sectional, front elevational view. 
     FIG. 3 is a view taken along the line A--A of FIG. 2. 
    
    
     In FIGS. 1 to 3, the PC board fixing metal fitting 1 according to the present invention comprises a support metal member 2 and an adjusting metal member 3. Threadedly connected to the support metal member at one side portion thereof are an upward and downward adjusting screw 4 vertically extending therethrough, and a horizontally forward and backward adjusting screw 5 having two nuts 5a, 5a threaded thereon, with two washers 5b, 5b interposed between the two nuts. The support metal member has at the other side portion means for fastening it to a frame member 11a of the PC board 11, for example, by bolts 2a. 
     On the other hand, the adjusting metal member 3 includes upstanding plates mounted on a base board 6, horizontally securable, for example, to a beam 12 of a building structure, at three side portions thereof except for that side portion confronting the PC board. The confronting plate 7 confronting the PC board 11 has a notch 7a extending from its upper portion, and rightward and leftward adjusting screws 10, 10 are threadedly connected to and extending through the right- and left-side plates 9 and 8, disposed perpendicular to the PC board, with the distal ends of the rightward and leftward adjusting screws being opposed to each other. 
     The support metal member 2 is fastened to the PC board 11 beforehand. For the installation, as shown in FIG. 1, the side portion of the support metal member to which the upward and downward adjusting screw 4 and the forward and backward adjusting screw 5 are threadedly connected in place on the base board 6 between the distal ends of the rightward and leftward adjusting screws 10, 10 (At this time, one or both of the rightward and leftward adjusting screws 10, 10 have been loosened to increase the spacing therebetween) in such a manner that the forward and backward adjusting screw 5 is received in the notch 7a of the confronting plate 7. And, as shown in FIG. 2, the two washers 5b, 5b are disposed on the opposite sides of the confronting plate 7, and the nuts 5a, 5a are positioned on the outsides of the washers 5b, 5b, respectively. 
     In the case where the width of the notch 7a is narrow, the washers 5b may be omitted, but in the case where the width is large to obtain a large amount of adjustment in the rightward/leftward direction, it is better to interpose the washers 5b as is the case with this embodiment. 
     For effecting the position adjustments, the nuts 5a on the forward and backward adjusting screw 5 are loosened to be free from the confronting plate 7. Thereafter, first, for example, the upward and downward adjusting screw 4 is turned to carry out the position adjustment in the vertical direction. Then, one of the rightward and leftward adjusting screws 10, 10 is turned, and the other is turned in the opposite direction to carry out the position adjustment in the rightward/leftward direction. Then, one of the nuts 5a, 5a threaded on the forward and backward adjusting screw 5 is turned, and the other is turned in the opposite direction to carry out the position adjustment in the forward/backward direction, thereby positioning the PC board in place. With respect to the order of this positioning operation, the position adjustment may be started in any of the directions. 
     After the positioning is finished, the rightward and leftward adjusting screws 10 are tightened to firmly clamp the support metal member 2 therebetween, and the nuts 5a on the forward and backward adjusting screw 5 are tightened to firmly clamp the confronting plate 7 therebetween through the washers 5b, so that the PC board 11 is fixed in the above-mentioned position. 
     Owing to the weight of the PC board 11 and the tightening forces of the rightward and leftward adjusting screws 10 and nuts 5a of the forward and backward adjusting screw 5, a stable fixing on the base board 6 in the vertical direction is achieved. 
     Therefore, the PC board 11 can be readily and firmly installed in place. 
     ADVANTAGEOUS EFFECTS 
     As described above, with the use of the fixing metal fitting according to the present invention, the position adjustments in the upward/downward, rightward/leftward and forward/backward directions can be made independently of each other when the PC board is to be installed, which greatly improves the installation efficiency.