US770618A - waite - Google Patents

Description

No. 770,618. PATENTED SEPT. 20, 1904.

Gr. B. WAITE.

EXTENSIBLE GENTERING SUPPORT.

APPLICATION FILED JULY 5, 1904.

No MODEL.

Patented September 20, 1904.

PATENT OFFICE.

GUY B. WAITE, OF NEW YORK, N. Y.

EXTENSIBLE CENTERlNG-SUPPORT.

SPECIFICATION forming part of Letters Patent No.V 770,618, dated September 20, 1904.

Application filed July 5, 1904. Serial No. 215,329. (No model.)

To all whom, it may concern:

Be it known that I, GUY B. WAITE, acitizen of the United States, residing in the city, county, and State of New York, have invented certain new and useful Improvements in Extensible @entering-Supports Employed in the Construction of Arches, of which the following is a specification.

My invention relates to an improved form and construction of temporary centering-supports used in the construction of arches of concrete, masonry, and the like.

My present invention relates to the same general subject-matter as is disclosed in Letters Patent No. 724,146, granted to me March 31, 1903, being in the nature of an improvement upon the construction disclosed in the said patent. In accordance with the aforesaid patent I have extensively employed in the construction of arches a support for the lagging consisting of a pair of wooden ribs disposed side by side and each having lixed to one end a laterally-extending rest-piece, on which the adjacent end of the other rib is slidably supported with the ends of the rest-pieces or other extension members of the ribs stepped on the lower flange of the permanent I-beamsupports of the arch. I have found in practice that the ends of these rest-pieces or extension members usually leave considerable of a hole in the concrete when removed and being permanently secured to the ribs render necessary the use of separate sets of ribs and rest-pieces for arches of varying heights.

It is the object of my present invention to improve upon this construction in the way of presenting a smaller obstruction to the concrete illing and enabling the same ribs and rest-pieces to be employed in the construction of arches of varying heights.

To these ends my invention consists, generally stated, in the combination, with the centering-ribs and laterally-extending rest-pieces secured to the lower edges thereof at their opposite ends, of detachable suspension-hooks, secured to said rest-pieces and considerably narrower than the latter, adapted to engage the lower flange of the permanent I-beam or other supports of the arch, and thus support the ribs from the latter.

My invention further consists in a novel means for securing the rest-pieces to the ribs in such a manner as to insure against their accidental separation under unusual strain, such means consisting of a wire or strap in the form of a loop carried over and around the rib and secured to or near the rear end of the rest-piece, thus tying the latter to the rib by a tension member capable of resisting the maximum strains to which the ribs are ever subjected in practice.'

I have illustrated my invention in the accompanying drawings, wherein- Figure 1 is a vertical cross-section through that portion of an arched iireproof floor of concrete or the like lying between two adjacent I-beams, showing my improved centering structure in side elevation therein. Fig. 2 is a similar View, broken away intermediatethe I-beams, of a similar structure adapted for the formation of a low or iiat arch. Fig. 3 is a top plan View of Fig. 1, omitting the concrete and lagging. Fig. 4 is a perspective View of one end of the companion ribs and their supporting means; and Fig. 5 is a perspective view of the parts shown in Fig. 4 at a different angle, illustrating the means and manner of attachment of the rest-piece to the rib and of the hanger to the rest-piece.

Referring to the drawings, 10 designates the usual I-beams or gil-ders, constituting permanent supports for the arch.

11 designates an arched filling of concrete, cement, or other ireproof material. To support this material as it is laid in place, I employ a series of transverse ribs disposed side by side in pairs, said ribs being designated by 12 and themselves directly supporting the lagging-strips 13.

14 designates each of a pair of what I term rest-pieces, secu red to opposite ends, respectively, of the two ribs, each of said rest-pieces extending laterally of the rib to which it is secured suiiiciently to constitute a direct rest or support for the adjacent end of the other rib with capacity for the latter to slide thereover a limited distance to suit the distance between the I-beams, all as fully disclosed in my former patent above referred to.v

Heretofore and at present in the case of comparatively short ribs the rest-pieces may be and are secured to the latter by nailing or screwing them in place, as indicated at 15. In the case of long ribs and ribs subjected to unusually heavy loads, however, there is danger that the rest-pieces may break away from the ribs before the arch is completely filled in or set, and to obviate this danger one feature of my present improvement consists in the employment of a loop 16 of wire or strap metal, which is fitted around the rib with its lower ends passed through apertures in orl carried around the rear end of the rest-pieces and then turned inwardly and nailed, twisted together, or otherwise secured to or beneath the rest-piece, as plainly shown at 17 in Fig. 5. By this means that portion of the restpiece subjected to the greatest strains tending to disrupt it from the rib is securely united to the latter by a tension member easily capable of resisting such strains without interfering with the operation of the companion rib.

In order to support the ribs and rest-pieces from the I-beams, I employ narrow bent iron suspension hooks or hangers 18, which are nailed by their lower horizontal portions 18 to the under side of the outer end of the restpiece approximately coincident with the transverse center of the latter, as shown at 19 in `Figs. 1 and 5, their vertical portions lying opposite the end of the rest-piece and rib and their outer projecting lips 18b taking over the lower flange of the I-beam. As illustrated in Figs. 1 and. 2, these suspension-hooks will be made of varying heights, according to the various heights of arches to be served by the ribs, and with a given set of ribs and restpieces permanently secured thereto all that is necessary to adapt the ribs to an arch of any given height is to select from among the hooks such as are of the height required and nail or otherwise secure them to the restpieces, removing and replacing them by lower or higher hooks for subsequent uses as to the particular formation of subsequent arches may necessitate. The arch shown in Fig. 1 is a high arch, and consequently the hooks 18 required therefor are low or short. The arch served by the construction shown in Fig. 2 would be a low or flat arch, which would require the use of a long or high hook-18. Obviously intermediate arches would require hooks intermediate the dimensions represented in these two figures. The hooks as herein shown are narrow and rectangular in cross-section; but it is obvious that the vertical and upwardly-projecting portions of the hook would serve equally well if made of round metal. Preferably the vertical portion of the hook is carried up in direct face contact with the outer end of the rest-piece and rib to the extent that it follows thelatter, this disposition of the parts contributing to increased rigidity and strength of the structure as a whole. This, however, is not essential, and the upright member of the hook may be more or less separated fronrthe end of the rib to provide more space for lagging or concrete when desired.

While I have shown and described the upper bent ends of the hooks as adapted to take over and rest upon the iianges of the permanent I-beam supports and contemplate such as their principal mode of use, yet such a manner of supporting the hooks is not of the essence of the invention. In some cases side boards running parallel with the I-beams on either side of and suspended from the latter are employed, and in such cases the upper ends of the hooks would hook over the upper edges of such side boards. My invention also is not concerned with any particular form or contour of centering-ribs.l For convenience and brevity of illustration I have shown only plain rectangular ribs; but it is obvious that the herein-described rib supporting and suspending means are applicable to other forms of ribs, such as curved ribs or ribs having straight intermediate portions and rounded or cut-down ends.

I claim- 1. In a centering-support for arches, the combination with a pair of ribs disposed side by side and longitudinally adjustable relatively to each other, of rest-pieces secured to opposite ends of said ribs, respectively, each adapted to support the adjacent end of the companion rib, and suspension-hooks secured to said rest-pieces and extending upwardly and forwardly of the ends of the ribs, substantially as described.

2. In a centering-support for arches, the combination with a pair of ribs disposed side by side and longitudinally adjustable relatively to each other, of rest-pieces secured to the lower edges of said ribs at opposite ends thereof, respectively, each adapted to support the 4adjacent end of the companion rib, and narrow suspension-hooks secured to the under sides of said rest-pieces, and extending upwardly and forwardly of the ends of the ribs, substantially as described.

3. In a centering-support for arches, the combination with a rib and a rest-piece for the adjacent endof a companion rib extended laterally from the lower edge of said first-named rib, of means for securing said rest-piece to said rib consisting of a metal loop or band embracing said rib and rest-piece and constituting a tension-bond between said parts, substantially as described.

#1. In a centering-support for arches, the

IOO

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combination with a rib and a rest-piece for l sion-bond between said parts, substantially as the adjacent end of a companion rib extended laterally from the lower edge of said lil-stnarned rib, of means for securing said restpieee to said rib consisting of a metal loop 0r band embracing said rib and rest-piece through apertures in the latter and constitutingatenas described.

` GUY B. WAITE. Witnesses:

JESSE GRANT- ROE, LEONARD V. Ron.

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