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Publication numberUS778416 A
Publication typeGrant
Publication dateDec 27, 1904
Filing dateFeb 29, 1904
Priority dateFeb 29, 1904
Publication numberUS 778416 A, US 778416A, US-A-778416, US778416 A, US778416A
InventorsRobert C Kyle
Original AssigneeRobert C Kyle
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Frame for plastic beams.
US 778416 A
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Description  (OCR text may contain errors)

No. 778.416.l




ATTORNEYS Patented December 27, 1904.



v53]?ECIFICA'IION forming part of Letters Patent No. 778,416, ddated December 27, 1904.

, Applioaimied February 29, 1904. serai No. 195,705:

T all whom, t may concern:

. Re it known that I, ROBERT c. KYLE, a cia,

zen of the United States, residing at Columbus, in the county of Franklin and State of Ohio, have `invented a certain vnew and useful Improvement in Frames for Plastic Beams, of which the following is a specification.

My invention relates to an improvement in skeleton frames for concrete beams or stringers. y

The object of my invention is to provide a frame that maybe perfectly alined.

A particular novel feature resides in channel-bars in which the concrete deposits, thus securely tying itself -to the frame.

Finally, the object of the invention is to provide a device of the character described which 'will be strong, durable, and efficient, comparas igned to remain intact.

tively simple and inexpensive to construct, and one in which the parts are specially de- With the above and other objects `in view the invention consists of the novel details of construction and operation, a preferable embodiment of which is described in the specification, and illustrated in the accompanying drawings, whereiny y Figure 1 is a side elevation. Fig. 2 is a top plan view, and Fig. 3 is a transverse sectional view taken on the line a; of Fig. 2.

In the drawings the numeral 1 designates the end plates of any suitable shape and formed, preferably, of sheet metal. .The plates are connected centrally at their tops and bottoms by two longitudinal channel-bars 2 by means'of angle-irons 3, which are riveted to the plates and the-bars. The beams are disposed with their channel-openings upward, and thus when the concrete is molded around the frame it will ll in the channels and when set constitute a tie between itself and the bars. It is obvious that this formation will greatly stiffen the beam, especially against lateral y, strains. The channel-bars 2 are connected by strap-irons 4, disposed at intervals and inclined from the center of the frame. These irons 4 are bent or otherwise formed with feet 5, by which they are secured tothe bars by any suitable means, such as rivets. It is to be understood that the stralpirons 4 may be disposed at various angles and that the arrangement shownin the drawings is merely a preferable way of disposing the same. Asa 'further means of connecting the plates 1 .I employ longitudinally-disposed cables formed with eyes 6 at each end, which engage hooks 7,

passed through the plates and formed with screw-threaded shanks 8, which project beyond the plate. Nuts 9 are threaded on the Shanks 8 and bear against the outer surfaces of the plates l, so that by tightening up the nuts the cables may be stretched and placed under tension. The cables are preferably arranged in three` series, as indicated at 10, 11, and 12. The cables '10 are disposed alongQthe bottom of the frame at equal distances on each side of thelower bar 2 in a horizontal planef- The second series of cables 11 extend centrally of the length of the frame and are equidistantlydisposed on each side of the center thereof. The cables 12 are secured to the hooks 7, arranged along the top of the plates, and are caught under gage-hooks 13, extending upwardly from a plate 14, extending transversely 'acrossv the center of the frame and secured upon the top of the lower channel-beam 2.

It is to be observed that should it be desired to curve'the beam or frame that by causing suitable pressure to be exerted on the cables 12 the lower beam 2 would be bowed or curved upward through the agency of the hooks 13 and the plate 14. This might be accomplished through any suitable means.

Itis apparent that the hollow frame is held stiff and rigid and that by tightening or loosening the nuts 9 any one of the. cables may be relaxed or stretched.

In using my frame in connection with a and resisting excessive strains.

I do not wish to limit my invention to the exact details of descriptionV and operation or to the specific purpose for which the device is used, as I may employ the same in various 'arts and construct it from several materials IOC) without departing from the spirit thereof and wholly within the scope of my claims.

Having now fully described my invention, what I claim, and desire to secure by Letters Patent, is-

1. A skeleton Jframe for plastic structures, comprising longitudinal channel bars into which the plastic material is molded,end plates supporting the channels, stiening means disposed between the channels, and iiexible tensioned means connecting the end plates.

2. In a frame for plastic beams, end plates, channel-bars extending one abovel the other between the end plates, cables connecting the end plates, and means carried by the end plates for tensioning the cables.

3. In a frame for plastic beams, end plates, longitudinal channel-bars extending from one plate to the other, stiiening means disposed between the longitudinal bars, and flexible tensioned means connecting the end plates.

4. In a frame for plastic beams, end plates,

rigid means connecting the end plates, cables extending between the end plates, :uljustable means carried by the plates and engaging the cables, and means for adjusting the said ad justable means to place tlie cables under tension.

A skeleton frame for plastic structures comprising, a pair of end plates, longitudinal channel-bars connecting the upper and lower ends of tlie plates, strap-irons extending bc tween the bars and connected to the saine, screw-hooks carried by tlie plates, cables extending between Llie plates and engaging the books, gage-hooks disposed across the vtraine and engaging some of the cables, and means carried by tlie screw-hooks for placing the cables under tension.


In presence ot'v C. C. SHEPHERD, A. L. PirnLrs.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3003217 *Feb 25, 1957Oct 10, 1961Ben C Gerwick IncApparatus for manufacturing prestressed concrete members
US3270471 *Oct 10, 1961Sep 6, 1966Prescon CorpPost-tensioning apparatus for prestressing concrete
US3300921 *Nov 13, 1961Jan 31, 1967Prescon CorpPost-tensioned prestressed concrete members
US3778946 *Dec 21, 1970Dec 18, 1973Woodco LtdTruss and method of making same
US6226944Apr 5, 1999May 8, 2001Mouchel Consulting LimitedReinforced structural member
US6389766 *Mar 2, 2000May 21, 2002Charles Paul JacksonDevice for increasing the strength of spanning structural lumber
US6735916Mar 8, 2001May 18, 2004Mouchel Consulting LimitedReinforced structural member
Cooperative ClassificationE04C3/09