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Publication numberUS205319 A
Publication typeGrant
Publication dateJun 25, 1878
Publication numberUS 205319 A, US 205319A, US-A-205319, US205319 A, US205319A
InventorsJames Tract
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Improvement in balloons
US 205319 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)



Patented Jun 25, 1878.







Specification forming part of Letters Patent No. 205,319, dated June 25, 1878; application filed December 1], 1877.

To all whom it may concern:

Be it known that I, JAMES TRACY, of Waltham, in the county of Middlesex and State of Massachusetts, have invented a new and Improved Balloon, of which the following is a specification The object of my invention is to so improve the construction of balloons as to enable an aeronaut to vary the capacity and buoyancy of his balloon for sustaining it at any desired altitude, and for ascendin gor descending, without the use of hydrogen or other gas for the purpose, simply by varying the space of vacuum.

The invention consistsin a balloon provided with ribs made of parts hinged together, said ribs being hinged with their upper ends to the upper end of a central shaft, and with their lower ends to a runner operated by a nut and hand-wheel on the threaded lower part of the central shaft, to expand and contract the balloon, as will be hereinafter described.

The accompanying drawingrepreseuts a vertical section of my improved balloon.

A is the. cover, made air-tight, of any suitable material. 13 are the ribs, made in parts, hinged together at b, to give flexibility for contracting and expanding the balloon, and hinged with their upper ends, at 01,, to a disk on the central shaft 0, and with their lower ends, at c, to the rim of the runner or sleeve D, surrounding the shaft 0. The lower end of the sleeve D is provided with a flange, d, in-

cased by or swiveled in an air-tight manner to the nut E, which works in thethreads on the shaft O,a"s shown in the drawing. The nut E is operated by the hand-Wheel e. F are the cords or lines, and G the steadying-ring for connecting the balloon with the car H.

The air is pumped out of the balloon, and the interior is vacuum. To increase or decrease the space of vacuum and the capacity and buoyancy of the balloon, it is only necessary to expand and contract it by turning the nut E up or down on the shaft 0, the sleeve D and ribs B being moved thereby similar to the runner and ribs of an umbrella.

- An air'pump may be connected with the balloon by a flexible tube to supply air for lessening its buoyancy when desired to descend, and increasing the same by rarefying the inclosed air for ascending.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- The combination, with cover A, of the ribs B, whose sections are hinged together at b, hinged at a to a disk on a central shaft, 0, and at c to the sleeve D, the latter being provided with a flange, d, swiveled to a nut, E, working on thread of said shaft, and operated by a hand-wheel, e, as shown and described.




Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4032086 *Oct 20, 1975Jun 28, 1977William Douglas CookeAerostats and aquastats
US4113206 *May 16, 1977Sep 12, 1978Wheeler David CLighter-than-air apparatus and method of utilizing same
US4758199 *Sep 28, 1987Jul 19, 1988Tillotson Frederick EToy balloon
US6016991 *Jan 24, 1997Jan 25, 2000Lowe, Jr.; Charles S.Evacuated rotating envelope aircraft
US6270036Sep 16, 1999Aug 7, 2001Charles S. Lowe, Jr.Blown air lift generating rotating airfoil aircraft
Cooperative ClassificationB64B1/00