Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS3252173 A
Publication typeGrant
Publication dateMay 24, 1966
Filing dateDec 11, 1963
Priority dateDec 11, 1963
Publication numberUS 3252173 A, US 3252173A, US-A-3252173, US3252173 A, US3252173A
InventorsEli I Robinsky
Original AssigneeEli I Robinsky
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Continuously extensible and roll-up structure
US 3252173 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

y 1966 E- 1. ROBINSKY I 3,252,173

Filed Dec. 11, 1965 ATTORNEY 3,252,173 CONTINUOUSLY EXTENSIBLE AND ROLL-UP STRUCTURE Eli I. Robinsky, 301 Jedburgh Road, Toronto,

Ontario, Canada Filed Dec. 11, 1963, Ser. No. 329,847

2 Claims. (Cl. 14-27) This invention relates to .a portable floating structure such as a bridge. More particularly this bridge is continuously extensible and can be easily rolled up and transported to a new site where it can be unrolled. I

Numerous types of portable floating bridges have been previously proposed and are in use. However, these bridges are constructed of many sections which have to be assembled at each new site and disassembled each time they are moved. Also these bridges have considerable bulk in their disassembled form and require much handling and space each time they are moved.

The bridge of this invention is made of a continuous strip of preformed resilient material such as steel or plastic which can be quickly and easily rolled, preferably on a drum, and unrolled. Very little asembling is required and the bridge is extended across the stream by simply unrollingfrom a drum on the shore or the bank.

This invention is founded upon the use of a resilient strip of material, such as spring steel, which can be wound onto a flat drum. However, when the strip is unwound the preformed curled edges which have been lying flat in the rolled up torm reform into two tubes which provide longitudinal rigidity and buoyancy. Transverse rigidity is provided by a lamina of corrugated material which is fixed to the flexible strip but which can also be rolled up longitudinally.

The accompanying drawings illustrate an embodiment of the invention in which,

FIGURE 1 illustrates the bridges partially rolled on a drum and extending out .to float on the water,

FIGURE 2 is a fragmentary exploded end portion of the bridge to show the cap which is used to seal the end of the bridge which is projected over the water.

FIGURE 3 is the land end of the bridge.

The bridge illustrated comprises a strip of thin resilient material 10 which is formed so that the edges are coiled into two longitudinal tubes 11a and 11b which will provide longitudinal rigidity and buoyancy and lamina of flexible corrugated material 12 which may be fixed to the thin flexible strip by means such as spot welding with the corrugations running transversely across the material '10 to provide transverse rigidity. The corrugated lamina 12 is of such a width as to preterably cover the space between the tubes 11a, \l lb and can be used as roadway A United States Patent F I 3,252,173 Patented May 24, 1966 for vehicles or a walk for persons. On rolling up the bridge as shown in FIGURE 1, the tubes 11:; and -L1b uncoil and flatten permitting the bridge to be rolled up to form a cylinder. This may be done on a drum (FIG. 1) operated by hand cranks 20, 21, the drum being mounted near the shore or bank. On unrolling the bridge it extends across the river and floats as illustrated. In order to prevent the bridge from flooding an end cap 113 is fitted over the end which will be projected over the water.

FIGURE 2 illustrates details of a suitable end cap. A metal casing 14 of the correct size to tfit over the end of the bridge is titted with a gasket 15 of suitable material such as rubber. Thexcasing .14 is formed with a core '16 which, with the casing, forms a slit 17 along the bottom edges of the cap into which the end 118 of the base of the bridge between the tubes lla and 1r1b may fit with a fluid tight seal, and the core also forming casing wells t19a and 4191) into which the ends of the tubes 11a and il lb will tit against the gasket [15 with a fluid tight seal.

A suitable means of attaching the end caps to the bridge would be by the use of pairs of complemental mating brackets 20., each being punched to receive bolts 23, one bracket of each pair being welded-to the end of the bridge and the other attached to the end cap.

What I claim as new and desire to protect by Letters Patent of the United States is:

1. A portable floating structure comprising a continuous strip of thin resilient material termed with the longitudinal edges coiled transversely to form a scalable tube along each lateral edge to provide fluid tight buoyancy chambers and longitudinal rigidity, said tubes being capable 'of uncoiling when said strip is rolled up to form a cylinder, a lamina of corrugated material fixed to the resilient strip between the tubes, said lamina providing transverse rigidity and being capable of being rolled longitudinally with said strip when rolled up and an end cap at the end of the structure in sealing engagement with the end of each of said tubes to forma water free compartment.

2. A portable floating structure 'as claimed in claim 1 wherein the thin resilient strip is spring steel.

References Cited by the Examiner UNITED STATES PATENTS JACOB L. NACKENOF'F, Primary Examiner.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2905282 *May 14, 1956Sep 22, 1959Miller Arthur SCollapsible tubular semi-rigid rod
US3144104 *Aug 3, 1961Aug 11, 1964Dehavilland Aircraft CanadaCoilable tube device
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3300910 *Dec 10, 1965Jan 31, 1967Peter IsaacReelable structural members
US3371453 *Aug 3, 1964Mar 5, 1968Dehavilland Aircraft CanadaCassette stem device
US3385397 *Jul 18, 1966May 28, 1968Eli I. RobinskyExtensible-retractile structure
US3466685 *Aug 28, 1967Sep 16, 1969Robinsky Eli IContinuously extensible and roll-up reinforced structure
US3696568 *Oct 28, 1970Oct 10, 1972Fairchild Hiller CorpCollapsible, extendible double tubular structure
US3808625 *Aug 10, 1972May 7, 1974Fowler WDevice for transferring personnel to and from a vessel
US4047257 *May 21, 1976Sep 13, 1977Lawrence Peska Assoc., Inc.Life saving apparatus
US4106149 *Jun 7, 1977Aug 15, 1978Barracudaverken AbInflatable floating bridge, laid out by inflating longitudinal hoses in the bridge
US4681482 *Apr 4, 1986Jul 21, 1987Fried. Krupp Gesellschaft Mit Beschrankter HaftungRollable temporary roadway and apparatus for rolling up an installed temporary roadway
US6602574 *May 28, 1999Aug 5, 2003Rolatube Technology LimitedExtendable, rollable member
US6904722Feb 21, 2001Jun 14, 2005The United States Of America As Represented By The Secretary Of The NavyElongated truss boom structures for space applications
US6920722Apr 14, 2004Jul 26, 2005The United States Of America As Represented By The Secretary Of The NavyElongated truss boom structures for space applications
US7546654Aug 8, 2006Jun 16, 2009Mordehay CarmelMobile compression and tension bridge and shelter structure
US8393581 *Nov 22, 2011Mar 12, 2013Composite Technology Development, Inc.Collapsible structures
US9045205 *Mar 14, 2013Jun 2, 2015Global Polymer Industries, Inc.Floatable boat ramp
US9617696 *Mar 19, 2015Apr 11, 2017The United States Of America As Represented By The Secretary Of The ArmyLightweight universal gap crossing device and method of use
US20040194397 *Apr 14, 2004Oct 7, 2004Brown Michael A.Elongated truss boom structures for space applications
US20070234490 *Aug 8, 2006Oct 11, 2007Mordehay CarmelMobile compression and tension bridge and shelter structure
US20110159755 *Nov 12, 2010Jun 30, 2011Moritz DufnerAid system, in particular for use in ice rescue
US20140270959 *Mar 14, 2013Sep 18, 2014Jody L. LemmeFloatable boat ramp
US20150144740 *Nov 26, 2014May 28, 2015Composite Technology Development, Inc.Extendible boom
USD751498Oct 8, 2014Mar 15, 2016Composite Technology Development, Inc.Trifold solar panel
USD754598Oct 8, 2014Apr 26, 2016Composite Technology Development, Inc.Trifold solar panel
USD755118Oct 8, 2014May 3, 2016Composite Technology Development, Inc.Trifold solar panel
USD755119Oct 8, 2014May 3, 2016Composite Technology Development, Inc.Trifold solar panel
CN104963270A *Jun 18, 2015Oct 7, 2015湖州升浙绿化工程有限公司Retractable bridge body
CN104963270B *Jun 18, 2015Mar 8, 2017浙江升浙建设集团有限公司一种可伸缩的桥体
CN104963272A *Jun 18, 2015Oct 7, 2015湖州升浙绿化工程有限公司Novel bridge body
CN104963272B *Jun 18, 2015Jan 25, 2017浙江升浙建设集团有限公司一种桥体
CN104963273A *Jun 18, 2015Oct 7, 2015湖州升浙绿化工程有限公司Telescoping bridge
CN106120536A *Jul 4, 2016Nov 16, 2016天津经天航空科技有限公司一种便捷充气气囊
EP0134352A1 *Sep 1, 1983Mar 20, 1985KAISER ALUMINUM & CHEMICAL CORPORATIONRapidly deployed assault vehicle surfacing or trackway system
U.S. Classification14/27, 52/108, 244/905, 14/2.4
International ClassificationE04C3/00, E01D15/20
Cooperative ClassificationE04C3/005, Y10S244/905, E01D15/20
European ClassificationE01D15/20, E04C3/00B