US1314491A - Formwork-hanger for concrete building construction - Google Patents

Description

S. R. BERKOWITZ (NOW IBY JUDICIAL CHANGE OF NAME 8. R. BERKE). FORMWORK HANGER ron CONCRETE BUILDING CONSTRUCTION.

APPLICATION FILED MAY 28. 1919.

1,314,491. PatentedAug. 26,1919.

UNITED STATES PATENT OFFICE.

STEVEN ROSS BERKOWITZ, (NOW BY JUDICIAL CHANGE OF NAME STEVEN ROSS BERKE,) OF BROOKLINE, MASSACHUSETTS.

FORMWORK-HANGER FOR CONCRETE BUILDING CONSTRUCTION.

Application filed May 28, 1919.

To all whom it may concern:

Be it known that I. STEVEN Ross BERKowrrz, citizen of the United States, residing at Brookline, county of Norfolk, State of Massachusetts have invented a certain new and useful Improvement in Formwork- Hangers for Concrete Building Construction of which the following is a specification, reference being had therein to the accompanying drawings.

The invention relates to an improvement in metallic hangers for use in supporting a portion of the formwork used in concrete building construction. In setting up the formwork for use in constructing floors in concrete building construction, it is common to use hangers to support some of the formwork. After the concrete has become thoroughly set the supporting formwork is taken down and used in constructing another floor, and so on, building up one floor above another. The concrete does not usually become fully set sufficient to permit the entire formwork for the floor to be taken down until after about two weeks or so from the time the concrete is poured. It does, however, become sufliciently set usually in about twenty-four hours, more or less, to render it safe to take down a certain portion of the formwork if it were practical to do so without taking down the rest of the formwork. As the formwork and the hangers are usually constructed it is not possible to take down a portion only for a single floor and leave the rest, and therefore. the whole formwork for any floor has to remain until the entire concrete construction for that particular floor has become fully set, thus preventing the use of any of the tormwork used in connection with that particular floor for other use for a period of about two weeks. If it is desired to continue work by building up a second floor without the delay required by waiting for the first floor to become fully set an entirely independent outfit of formwork must be provided for use on the second floor and then again another outfit for the third floor, and so on.

The object of the .present invention is to provide a hanger to be used to support a certain portion of the formwork, namely the portion which is necessary for that, part of the concrete which becomes self-supporting in a short time, or at least which becomes sutficiently set, so that a portion of the form- Specification of Letters Patent.

Patented Au 26, 1919.

Serial No. 300.259. I

work can be removed after a comparatively short, period of time, and to make the hanger of such construction that it can be readily released and thereby release that portion of the form which is not required for the full period of time for the entire floor to become set without disturbing the portion of the formwork which is required for the full period of time. In that way the hanger and that portion of the framing which is released is immediately available for use for the second floor, and then the next day these parts can be used for the third floor, and so on.

The invention will be fully understood from the following description when taken in connection with the accompanying drawings, and the novel features thereof will be pointed out and clearly defined in the claims at the close of this specification.

In the drawings, Figure 1 is a plan view of a portion of tormwork showing the use of hangers embodying the invention, the portion of the work which is shown being that portion which is adjacent to and surrounds the head of a column.

Fig.2, is an elevational view, partly in section.

Fig. 3 is isometric view on an enlarged scale showing the use of one oi the hangers attached to a girder and showing one end of a joist supported by the hanger,

Fig. 4 is a view partly in section, showing how the hinged hanger can be released from the girder allowing it to be dropped down together with the portions of the formwork supported thereby.

Referring now to the drawings, 1 represents a vertical metal tubular casing having a funnel shaped upper end 2, which forms the. mold for one of the concrete columns, a flared head therefor being formed by pouring concrete into the tubular casing. The tormwork may be variously formed and shaped according to the notions of different builders. In the form of the formwork shown in the drawings, there are provided wooden posts 3, on top of which are laid transverse girders 4, and on top of the girders 4 are laid joists 5 on which in turn is laid thin metallic flooring 6. The hangers A which embody the invention, and which will be more particularly described hereinafter, are hooked over the girders 4. These hangers are formed with loops at their lower ends which receive and support the joists 7. The

joists 7 support the formwork for the drop panel. As shown in the drawings there are laid transversely of the joists 7 the smaller joists S, on which in turn. are laid the boards 9, and on top of the boards 9 there are laid short joists 10 which form a wall, shown in m Fig. 1, to permit the drop panel construction, so termed, of the concrete floor 11. The drop panel portion is directly over the head of the column, being of somewhat larger diameter than the diameter of the head of the column and permits a greater thickness of the floor at that point.

It is to be understood that the formwork shown and described is simply illustrative of one form employed, and is shown merely to illustrate the way in which the hanger is used. The design of the formwork may be varied however to suit the different conditions of the work.

The hanger A consists of three members, one of which is the loop member and the other two members of which are a pair of angle arms or hook members hinged to the loop member, as shown in Fig. 3. The loo-p member is somewhat U-shaped in front View, having two upright portions 1212 connected by a bottom portion 13 to form the base of the loop. Preferably thisloop member is made out of flat metal. The lower portions of the legs 1212 are turned upward from the base 13 so that their faces are parallel, or substantially parallel, with each other and in planes at right angles with the face of the girder 4, to which the hanger is to be attached. This allows the faces of said lower portions of the legs to lie parallel with the sides of the joist 7 which is supported in the loop. The upper portions 12 of the legs 12 are preferably twisted through 90 degrees, so that said upper portions lie in the same plane with each other and may lie flat against the side face of the girder 4, as will be plainly seen in Fig. 8. The two hook members which are preferably made of fiat metal are each bent at a right angle, so as to hook over a rectangular girder, each hook member having a horizontal arm 16 and a downwardly extending arm 15. These two arms 1616 are respectively pivotally connected with the arms 12 12 of the loop member. Preferably this pivoted connection is in the form of a hinge, the arm 16 being formed with a barrel portion 14 formed of a tongue extended at the end of the arm 16 rolled over to form the barrel, and the leg 12 being formed at its upper end with two ears rolled over to form the barrel portions 1919 between which the tongue barrel portion 14 is received and said barrel portions 1919 are connected with the barrel portion 14 by a hinge pin 17 so that the hook member can be swung up with relation to the loop member, as shown in dotted lines in Fig. 4.

The downwardly extending arm 15 of the hook member is preferably formed with holes to permit the said arm 15 to be attachedto the girder 4 by nails 21, as shown in Fig. 4, so as to prevent the angle arm from being tipped up while the load is applied to the hanger. The loop hanger preferably extends down below the girder 4 far enough so that the joist 7 can be slipped through the loop, as shown in Fig. 8. The loop is offset, however, from the girder so that it will hold the joist.7 even if the hanger does not extend below the girder.

The joists 8 can be laid on the joists 7 and the other portion of the frame previously described can be built up as will be plainly seen. 7

If the loop extends down below the girder 4 so far that the joists 7 would normally be be farther down below the girder 4 than is desired, a block 22 may be placed in the bottom of the loop'on which the joist 7 will rest instead of having the joist rest directly on the bottom of the loop. Preferably the block is held in place by a pin or screw. By varying the thickness of the block employed, the joist 7 may be brought up to any desired relation to the girder 4.

After the concrete has been poured and it has set for say a period of twenty-four hours, or whatever time is necessary for allowing it to become sufficiently set to permit the removal of a portion of the formwork, the nails 21 may be readily withdrawn, then the hook members comprising the'angle arms 16, previously referred to, can be swung back on the hinges into the dotted line position shown in Fig. 4, thus allowing the hangers to be lowered carrying with them the joists 7, the transverse joists 8 supported by the joists 7, the boards 9 supported on the joists S and the wall joists 10 which surround the drop panel. This will leave the joists 3 supporting the girders 4 and the joists 5 which are sufficient to sustain the concrete body of the floor during the remainder of the time required for it to become fully set. The hangers and the formwork thus released can now be used in connection with the construction of another floor, and in this manner a single set of formwork hangers may take the place of a number of sets which would otherwise be required.

What I claim is 1. A hanger for use in combination with framing for formwork in reinforced concrete building construction, said hanger comprising a metallic loop member to rece1ve and support a beam or the like, in comb nation with two angle arms hinged re spectively to the upper ends of the legs of the loop member, said angle arms being adapted to engage over the top of a supporting beam.

2. A hanger comprising a loop member having two upwardly extending legs in combination with two angle arms hinged respectively to the upper ends of said legs, said angle arms being adapted to engage over a supporting member.

3. A hanger comprising a U shaped member in combination with two angle arms hinged respectively to the upper ends of the legs of said U-shaped member.

4. A hanger comprising a member having a lower portion formed with a loop to receive and sustain a beam or the like and having two upwardly extending legs in combination with two angle members hinged respectively'to the upper ends of the legs of said loop member, the angle members being adapted to engage over a supporting member and to be turned on their hinges to re lease the hanger from engagement with the supporting member.

5. A hanger comprising a member having a lower portion formed with a loop to receive and sustain a beam or the like and having two upwardly extending legs in combination with two angle members hinged respectively to the upper ends of the legs of said loop member, the angle members being adapted to engage over a supporting member and to be turned on their hinges to release the hanger from engagement with the supporting member, said angle members being formed with holes to permit them to be attached to a supporting member.

6. A hanger for use in building construction comprising a U-shaped member formed of a single bar of fiat metal, the legs of the said U-member being turned up from the base thereof in such manner that the lower portions thereof have their flat faces toward each other, the upper portions being twisted in such manner that the faces of the two legs are in alinement with each other and in planes at right angles with the planes of the said lower portions, in combination with two angle members hinged respectively to ,the upper ends of the legs of the said U- shaped member.

7. A hanger for use 1n building construct1on eomprlsmg a U-shaped member formed of a single bar of fiat metal, the legs of the said U-mcmber being turned up from the base thereof in such manner that the lower portions thereof have their flat faces toward each other, the upper portions being twisted in such manner that the faces of the two legs are in alinement with each other and in planes at right angles with the planes of the said lower portions, in combination with two angle members hinged respectively to the upper ends of the legs of the said U- shaped member, the angle members consisting of angle plates bent to substantially right angular form having a horizontal arm and a downwardly depending arm to permit the hanger to engage over a supporting beam.

8. A hanger for use in building construction comprising a U-shaped member formed of a single bar of flat metal, the legs of the said U-member being turned up from the base thereof in such manner that the lower portions thereof have their flat faces toward each other, the upper portions being twisted in such manner that the faces of the two legs are in alinement with each other, and in planes at right angles with the planes of the said lower portions, in combination with two angle members hinged respectively to the upper ends of the legs of the said U-shaped member, the angle members consisting of angle plates bent to substantially right angular form having a horizontal arm and a downwardly depending arm to permit the hanger to engage over a supporting beam, said angle members being formed with means whereby they may be detachably secured to a support.

9. A hanger comprising a loop member having two upwardly extending legs in combination with two angle arms hinged respectively to the upper ends of said legs, said angle arms being adapted to engage over a supporting member, and a removable block in the bottom of the loop member whereby the height of the joist may be adjusted to suit the conditions of the work.

In testimony whereof I aflix my signature.

S. ROSS BERKOWITZ.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Iatents, Washington, D. 0.

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