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Publication numberUS3580358 A
Publication typeGrant
Publication dateMay 25, 1971
Filing dateAug 8, 1969
Priority dateAug 8, 1969
Publication numberUS 3580358 A, US 3580358A, US-A-3580358, US3580358 A, US3580358A
InventorsYamamoto Masatada
Original AssigneeYamamoto Masatada
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Safety escape bag
US 3580358 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

United States Patent [72] Inventor Masatada Yamamoto No. 2 Koujimachi Building 4-2, Koujimachi, Chiyoda-ku, Tokyo, Japan [21] Appl. No. 848,523

[22] Filed Aug. 8, 1969 [45] Patented May 25, 1971 [54] SAFETY ESCAPE BAG 1 Claim, 3 Drawing Figs.

US. Cl

Field of Search 182/48 A62b l/20 [56] References Cited UNITED STATES PATENTS 391,051 10/1888 Jones 193/25 906,412 12/1908 Griffin 193/25 3,348,630 10/1967 Yamamoto 182/48 Primary Examiner-Reinaldo P. Machado Attorney-Browdy & Neimark ABSTRACT: A safety escape chute having a series of pliant tubular columns connected by resilient portions made of spiral mesh so that when a first escaper is in the chute his weight so defonns the spiral mesh resilient portions downwardly that a second escaper cannot pass therethrough and thus cannot collide with the first escaper at the bottom of the chute.



INVENTOR ATTORNEYS SAFETY ESCAPE BAG This invention relates to a safety escape bag used for refugees when the building is on fire.

The main object of the invention is to provide a safety escape bag characterized by the functions that any collision is surely prevented between refugees who are falling or descending in confusion through-the extended bag.

Another object of the invention is to provide a safety bag characterized by the function that any refugee will be forcibly and automatically checked for a while in the bag when the forerunner is still descending.

Now, with these and other features of the invention, further descriptions will be set forth substantially below in the illustrations, drawings and appended claims:

FIG. 1 is a perspective view of a safety escape bag installed over the building, carrying out an embodiment of the invention.

FIG. 2 is an enlarged view of the bag showing a novel function thereof.

FIG. 3 another enlargement of the bag showing the same function thereof in detail.

Referring to' FIG. 1, a slender, cylindrically formed, safety escape bag 2 is hanging over the building 1 vertically with the entrance or way in suitably installed on the uppermost window. The lowermost portion 3 of the bag 2 is formed with a closed flat bottom 4 which surely serves to prevent any fallingdown refugee from being directly crashed against the ground.

Also, the cylindrical bag is adapted to have a diameter to slide down the refugees narrowly, and being made of tough cloth, to slow down the falling speed of the refugees slightly by friction thereof. Said lowermost portion 3 of the bag 2 is mounted on the cylindrical side with exits 5, 5' which enable the refugees to get off the closed flat bottom 4. Said cylindrical bag 2 has one or more than two collision-checking or -stopping means 6 which form one of the major novelties of the invention. As clearly seen in FIGS. 2 and 3 together with FIG. 1, the tempo rary stopping means 6, in each, consists of a short cylindrical body of spiral mesh, just like that of fishnet, quite different from what is called cloth substance, to be positioned suitably to make one of the compartments of said bag. As the upper and lower dually threaded-out rims 7, 8 of the mesh stopping means are loaded with considerably strong and heavy weights of the refugees, the rim portions may be connected by means of bonding cements or reinforced by special mounting patches.

Thus, in actual operations, when the refugees go down through said safety escape bag 2, being made of cloth with the narrow diameter, causes the friction against the falling-down refugees, whereby their own-weights falling actions will be decreased in speed, to enable them to reach the bottom 4 at a safely reserved speed. Further, when the initial refugee passes down through said temporary stopping means of spiral mesh, he will be considerably checked in speed to continue to fall down safely until he reaches weighing said bottom 4 to urge said cylindrical bag 2 to extend itself downward, as shown by dotted lines in FIG. 1, because the bag is suspended over the building. Then, the slight extension of said cylindrical escape bag 2 decreases the diameter R to R1, to such an extent that the following refugee will be checked down temporarily by the stopping means 6 while the initial is still on said flat bottom before he is freed to fall down again as soon as the initial or forerunner gets off out of the optional exit of the lowermost portion thereof, to make the extended bag lose the loading pull therefrom.

As described above, this safety escape bag according to an embodiment of the invention is characterized in that any refugee who is confused to jump into the bag, is surely checked halfway by one of said temporary stopping means 6 from the forerunner to be safely protected against any possible collision from behind; in that said cylindrical spiral mesh means 6 is quite low in production cost as said fishnet like materials may be employed for; and in that any multiple application of said collision-stoppin means 6' with a regular interval, will assure more safety lan ings for the refugees without regard to said diameter R or R1.

In the drawings and specifications, 1 have set forth a preferred embodiment of the invention, and although special expressions or terms are employed for the embodiment, they are only used therefor in an illustrative or descriptive sense, and not for the purposes of limitation, the scope of the invention being defined by the appended claim.


1. An escape device comprising an elongated tubular body adapted to be supported at its one end in a position to extend vertically downwardly and including an opening at its upper end for receiving an escaper, a closed flat bottom at its lower end for catching thereon the escaper who has fallen through the body and an opening provided laterally to the wall of said elongated tubular body adjacent to its lower end for the escaper to exit from the body, and means to prevent the fall through said tubular body of a second escaper while a first escaper is in said escape device,

said tubular body comprising a series of pliant tubular columns having diameters sufficient for allowing an escapr to pass through and connected by resilient portions made of spiral meshes, said resilient portions comprising said means to prevent the fall of a second escaper, each said resilient portion having a diameter smaller than those of the tubular columns and being radially expandable to such an extent that the free fall and downward speed of an escaper are resisted and reduced, each said resilient portion being longitudinally expandable to such an extent that it can completely prevent the fall of the second escaper therethrough when the first escaper has been caught on the closed flat bottom and his weight is added to the device, thereby preventing two escapers from colliding each other at the lower end of the device.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US391051 *Apr 24, 1888Oct 16, 1888 Retarding-tube for cash-carriers
US906412 *Feb 15, 1908Dec 8, 1908James Shafer GriffinFruit-picker.
US3348630 *Dec 17, 1965Oct 24, 1967Masatada YamamotoEscape device
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3762507 *May 20, 1971Oct 2, 1973Starr JShock absorbing safety line
US3977495 *Apr 16, 1975Aug 31, 1976Societe Soberal S.A.Rescue apparatus
US4005762 *Jul 2, 1975Feb 1, 1977Societe Soberal S.A.Rescue apparatus
US4398621 *May 6, 1981Aug 16, 1983Baker Ralph TFire escape
US4580659 *Jun 27, 1985Apr 8, 1986Baker Safety Equipment, Inc.Combination fire escape tube and rescue vehicle
US4582166 *May 24, 1985Apr 15, 1986Baker Safety Equipment, Inc.Fire escape having guide wire mechanism
US4583616 *May 24, 1985Apr 22, 1986Baker Safety Equipment, Inc.Portable fire escape
US4705141 *Oct 15, 1985Nov 10, 1987Splaine Constance KCompact fire escape
US4743007 *Dec 5, 1985May 10, 1988Free Motion Designs CorporationRecreational device for producing the thrill of a series of consecutive free falls
US5060753 *Jan 30, 1991Oct 29, 1991Sherlene HopkinsFire escape chute
US5209323 *Jul 23, 1992May 11, 1993Sherlene HopkinsInterior fire escape chute for a building
US5562184 *Jul 11, 1995Oct 8, 1996Yung-Ho; HsuApparatus for high-rise escape slow descending tube
US8316991 *Aug 30, 2004Nov 27, 2012Viking Life Saving EquipmentDevice of an evacuation system
US20070119654 *Aug 30, 2004May 31, 2007Akselsen Bjorn TDevice of an evacuation system
WO1992003189A1 *Aug 23, 1991Mar 5, 1992Ghassan NehailiApparatus for controlling a descent of a person or an object
WO1998031424A1 *Jan 21, 1997Jul 23, 1998Cerberus Res & Dev Inst IncEmergency evacuation system
U.S. Classification182/48
International ClassificationA62B1/20, A62B1/00
Cooperative ClassificationA62B1/20
European ClassificationA62B1/20