US 1765729 A
Description (OCR text may contain errors)
June 24, 1930- w. F. LA MORTE 1,765,729
STRUT USED IN CONCRETE FIREPROOFING Filed Jan. 1:. 1928 A TTORNE Y5.
- 1o crete envelope;
Patented June 24, 1930 PATEN'T OFFICE WILLIAM 1*. LA mourn, or New YORK, N.- Y.
STRUT USED IN CONCRETE FIREPROOFING Application filed January 13, 1928. Serial No. 246,408.
This invention relates to the art of insulating metal beams or girders by enclosing the same in a concrete envelope, and particularly has to do with means for providing a strut to be interposed between the base of a beam or girder and a suitable soflit board.
Inmodern building construction beams and girders are employed, and it is customary to enclose such beams or girders in a con- The result is accomplished by enclosing such beams or girders-within suitable forms and in constructing said forms there is employed what is known as a soflit board lying parallel with the base of the beam or girder to be enclosed. This sot-- fit board forms the base of theform and it is necessary that it should be spaced from the base of such'form by a predetermined dimension. In like manner the walls of the form must be spaced apart from the beam or girder a predetermined dimension.
In work ofthis nature it has been customary to establish the position of said soflitboard or of said side walls by interposing a block of wood nailed to the sofiit board, and
the walls of the form have been suitably sustained by their association with other portions of the form.
This invention relates to an instrument by which said spacing operation may be accomplished with celerity and economy, and the instrument is suitable for use primarily to space apart the soflit board and the. base of a beam or girder, but it may be employed to space apart the walls of a form with reference to the girder, or for any other use or purposein this connection.
The instrumentalities referred to are illustrated in the accompany-ing drawings, the parts being indicated by numerals, like numerals designating like parts.
Figure 1 is a horizontal sectionof a beam or girder enclosed within a suitable form illustrating the strut ofthis invention, as in- 45. terposed between the base of the beam or girder and the soflit boa-rd.
Figure 2 is a perspective view of the strut which is the subject matter of this invention.
Figure 3 is a perspective view illustrating another form of strut construction.
Referring to Figure 1, 1 indicates the web of the beam or girder, 2 the top fla and 3 the bottom flange thereof. 4 is a. so t board forming the base of the form,'whi1e 5 is a cross-axial support interposed cross-axially of said boards at suitable intervals longitudinal thereofl'to serve as a support therefor. 6 is'a wire passingover the top of the beam or girder and through apertures in the soflit board and also through the supporting no I bar 5. These wire supports are usually spaced apart by several feet. 7 is a. platform adapted to support the form. 8 and 8 are vertical walls of the form, and 9 and!) are horizontal walls, while the dotted line 10 :5 indicates the oint to which the concrete is permitted to 11 the form.
11 is the 'shankor stem of the spacing instrument. It isprovided with a head l2'and a point 13, while 14 is a detent integral with sald shank and interposed intermediate said point and head. 1 The length of the shank between the points 13 and 14, as 16, is'variable to suit the thickness of the wood forming the sofiit board 4 and the support 5, but it may be 7 V of any suitable length to sustain itin a vertical position. The space between the head 12 and the detent'14 is a predetermined dimension sufficient to satisfy the requirements with respect to the thickness of the fireproofso ing envelope lyin between the base of the a beam and the so tbozird. The illustration of Figure 3 is the same as that'of 2 9 with the exception that instead ofa disk-14,1 V a bar 15 may be constructed perpendicular 85, to. the axis of the shank, to'serve thepurpose j of a detent, in like manner as the detent-14.--
f The operation of the device is asfollows. When the walls andlatform 8 and 9 of the form are constructe they rest on the platform 7.- The strut 11 is then driven into the soffit board, as by a hammer engaging the head, preferably in a position axial o the soflit board,-and it may also pass through the support 5 until the detent=14 comes'in contact and predetermined dimension between the upper surface of the sofiit board and the lower surface of the beam or girder. The wire 6 is then passed through suitable holes in the soflit board 4 and sup rt 5 and run over the 5 top of the beam2, an tightened by any suitable means, so that the sofiit board is drawn into position with respect to the base of the beam, as far as the strut 11 will permit such movement. The strut therefore performs the definite function of spacing apart the base of the beam and the upper face of the soflit board.
When the concrete is poured into the mold in the usual way, the head 12 and detent 14 and the shank between the same are enclosed within the concrete envelope, and remain imbedded therein. To remove the form, the wire 6 is cut at some point below the sup port 5 and strai htened out, so thatthe sup= port and the so t board may be withdrawn, The ends of the wire 6 and the nail section 16 may be then cut ofi by any suitable means, while the wire 6 and the strut remain imbedded in the concrete.
As previously stated, these struts are preferably arranged in a line adjacent the axis of the soflit boards, and they may be spaced apart any predetermined dimension, but they may be employed as indicated in the drawing at the oint where the soffit board is supported y wires, or otherwise, as the circumstances of the case may require.
It will be obvious that this form of strut a may be employed in analogous positions in the building up of concrete forms, and the dimension of the strut, and the dimension of w the nail end may be determined by the cir-=' 1 cumstances of each case, without departing w from the spirit ofthe' invention.
Claim: l 4
In an assembly of thecharacter described, a strut. comprising a shank provided at one end with a headand at the opposite end with a point, and rovided" intermediate its head i and point wit an integral cross axial detent 'ada ted to limit thethrust of the shank a pre etermined dimension and likewise to es- 4 tablish a predetermined dimension between said detent and said head, in combination with a girder which it is desired toenclose in corn crete, a form board in which the shank is driven to seat the detent againstthe face of the formboard, and means, independent of the strut, for supporting the form board in cooperative relation to the irderwith the head of the shank iii end abutting engagement withthe girder to space the form board said" predetermined dimension from the m girder.
' Signed by me at New York city, N. L, this 12th day of January, 1928. y WILLIAM F. LA MORTE;