US3252469A

US3252469A - Collapsible hyperbolic paraboloid umbrella

Info

Publication number: US3252469A
Application number: US336931A
Authority: US
Inventors: George H Peake
Original assignee: Individual
Current assignee: Individual
Priority date: 1964-01-10
Filing date: 1964-01-10
Publication date: 1966-05-24
Anticipated expiration: 1983-05-24

Description

y 1966 G. H. PEAKE 3,252,469

COLLAPSIBLE HYPERBOLIC PARABOLOID UMBRELLA Filed Jan. 10, 1964 3 Sheets-Sheet 1 INVENTOR.

GEORGE H. PEAKE BY 42% @ZZLQ y 1966 G. H. PEAKE 3,252,469

COLLAPSIBLE HYPERBOLIC PARABOLOID UMBRELLA Filed Jan. 10, 1964 5 Sheets-Sheet 2 INVENTOR.

GEORGE H. PEAKE May 24, 1966 G. H. PEAKE COLLAPSIBLE HYPERBOLIC PARABOLOID UMBRELLA 5 Sheets-Sheet 5 Filed Jan. 10, 1964 b. W K 2 9 W 7 F HT I 1 F w a v G w 8 8 I I F w w L. (fill.

INVENTOR- GEORGE H- PEAKE United States Patent 3,252,469 QULILAISIBLE HYPERBOLIC PARABOLOID UMBRELLA George II. Pealre, 4 Fawn Ridge, Fairfax, Calif. Filed Jan. 10, 1964, Ser. No. 336,931 9 Claims. (Cl. 13520) This invention relates to umbrellas and more particularly to umbrellas of the collapsible type and still more particularly to such umbrellas having the configuration of a hyperbolic paraboloid. i

Generally speaking, umbrellas of the prior art have been in the shape of an inverted saucer or bowl wherein pliable material is stretched over a plurality of struts, the struts providing the shape of the umbrella itself. While such umbrellas have received much commercial success in the past, they are clearly plagued with certain disadvantages. Among these disadvantages is the fact that the prior art umbrella takes the shape of an air foil such that during gusts of high wind the umbrellas are frequently inverted. Moreover, due to the shape of the umbrella the run-ofi of rain occurs about the entire periphery such that any portion of the user's body extended beyond this periphery is subjected not only to 'the normal rain but also to the run-01f from a substanprovide an improved umbrella structure.

It is a more particular object of this invention to provide an umbrella structure having the configuration of a hyperbolic paraboloid.

It is another object of this invention to provide an umbrella structure of the aforementioned character in which the shape of the hyperbolic paraboloid is maintained by applying tension between the edges of a rectangular membrane of pliable resilient material.

It is still another object of this invention to provide an umbrella structure of the aforementioned character which is collapsible.

It is still another object of this invention to provide an umbrella structure of the aforementioned character which may be mounted in an adjustable position about a vertical mast secured thereto.

It is still another object of this invention to provide an umbrella structure of the aforementioned character which is further adjustable to vary the depth of the hyperbolic paraboloid configuration.

These and other objects and features of the invention will become more clearly apparent upon a review of the following description in conjunction with the accompanying drawing, in which:

FIGURE 1 is an elevational view of an umbrella structure in accordance with one embodiment of .the invention;

FIGURE 2 is a perspective view of the frame, mast and strut members of the umbrella structure shown in FIGURE 1;

FIGURE 3 is a view similar to FIGURE 2 but showing the frame in partially collapsed position;

FIGURE 4 is an elevational view of an umbrella structure of FIGURE 1 shown in fully collapsed position with the membrane wrapped about the frame;

FIGURE 5 is a perspective View of the articulated coupling means employed between the various frame members of the umbrella structure shown in FIGURE 1;

FIGURE 6 is an elevational view of one portion of 3,252,469 Patented May 24, 1966 the coupling member and a sectional view through its associated frame member;

FIGURE 7 is a perspective view similar to FIGURE 2 but showing an alternative embodiment of the invention;

FIGURE 8 is a plan view of a frame showing still another embodiment of the invention;

FIGURE 9 is a detailed plan view showing means for coupling the ends of the frame members of the embodiment shown in FIGURE 8;

FIGURE 10 is a view taken along the lines 1010 of FIGURE 9;

FIGURE 11 is a detailed view partly in section, showing means for urging the frame members outwardly apart from each other in the embodiment shown in FIGURE 8;

FIGURE 12 is a plan view of a frame for still another embodiment of the invention;

FIGURE 13 is a view taken along the lines 1313 of FIGURE 12; and

FIGURE 14 is a detailed sectional view of the area encircled by the line 1414 of FIGURE 13.

Referring to the drawing, FIGURES 1 to 6 show a first embodiment of the invention wherein like members are designated by like reference numerals throughout. The embodiment of FIGURES l to 6 includes four frame members 11, '13, 15 and 17, each comprising elongated rods or tubes. The

various frame members

11, 13, 15 and 17 are coupled together at their ends one to the other by a fully articulated coupling 19. The coupling 19 includes a pair of hinge knuckles 21 but instead of the usual hinge leaves, there are included a pair of threaded studs 23. The knuckles 21 are pivotally joined by means of a pintle 25 and the studs 23 are received by internally threaded collars 26. The collars in turn are secured at the ends of the frame members 11 as best seen in FIGURE 6.

Thus it is seen that the articulation of the coupling member not only permits the usual hinge coupling movement provided by the pintle 25 but also permits the

various frame members

11, 13 and 17 to rotate with respect to each other. While rotation of the frame members with respect to each other will, of course, cause some longitudinal extension or contraction of the knuckles 21 with respect to their associated frame members, it should be clear that this axial movement will be relatively slight when the rotation of the frame members is limited to something less than With the configuration of frame members and coupling devices as above described, it is apparent that

opposite frame members

11 and 15, as well as

opposite frame members

13 and 17 may be skewed with respect to each other asshown in FIGURES 1 and 2. It should likewise be apparent, that in plan view the dimensions of the frame member and coupling device configuration will be somewhat smaller when opposite frame members are skewed than would be the case if all members were in the same plane.

To the configuration of

frame members

11, 13, 15 and 17 and coupling means 19, is attached a membrane of pliable resilient material such as fabric, plastic or rubber sheeting. The dimensions of this membrane 27 are selected to be smaller than configuration defined by the

various frame members

11, 13, 15 and 17 and the coupling means 19 when these members all lie in a common plane and the membrane itself is in relaxed condition. The membrane 27 is affixed to the

frame members

11, 13, 15 and 17 such as by sewing a deep hem at the edges of the membrane to provide a tubular opening for each of the frame members. The frame members may be inserted into the tubular openings prior to connecting the coupling means 19 or alternatively, may

be sewn to the frame members in place after the couplings have been connected.

In a device as thus far described, including only the frame members, the coupling means and the pliable membrane, the frame members will be urged into an intensively skewed relationship to the point that the membrane 27 is completely relaxed. Thus it is necessary to provide means for urging the frame members outwardly apart from each other to place the membrane 27 in tension. Such means in the embodiment shown in FIGURES 1 to 6 include strut means such as the

rods

29, 31, 33 and 35. Each of the

rods

29, 31, 33 and 35 are pivotally connected to the centers of one of the

frame members

11, 13, 15 and 17. The other ends of the rods are connected to pivot means 37 slidably engaged on a mast 39. The pivot means 37 incorporates an elongated collar 41. These rods are not only pivotally connected to the

frame members

11, 13, and 17 but are also rotated about the axis of the

rods

29, 31, 33 and 35 themselves. Such a rotatable connection may be of the same type shown in FIGURE 6 with respect to the frame member connector 19. Secured to the top of the elongated collar 41 are four radially extending wings 43. The ends of the

rods

29, 31, 33 and 35 are each pivotally secured to one of the wings 43. Thus each of the

rods

29, 31, 33 and 35 are permitted to rotate about their pivotal connection at the wings 43 in planes defined by each of the respective rods themselves together with the mast 39. Moreover, the pivotal coupling between the

rods

29, 31, 33 and 35 and the various frame members -11, 13, 15 and 17 are such that each of the frame members are pivoted about their connection in a plane defined by their respective frame member and rod.

While the elongated collar 41 is permitted to slide axially of the mast 39, means are provided to prevent rotation of the collar with respect to the mast. Such means may take the form of an elongated axial slot 45 on the mast 39 together with an internally extending detent (not shown) on the inner surface of the collar 41. Any alternative means for permitting axial movement of the collar 41 while preventing rotation with respect to the mast may be employed.

Means are also provided for releasably locking the elongated collar 41 and thus the entire pivot means 37 at various positions axially extended along the mast 39. Such means are preferably in alignment with the elongated slot 45. A matching pin 49 may be resiliently urged toward the mast such that when the pin is in registry with one of the openings 47 it extends therethrough to prevent axial movement of the collar. A lever 51 may be provided to urge the pin 49 out of engagement with any of the openings 47 to selectively permit slidable movement of the collar 41 and the entire pivot means 37.

Four braces 53, 55, 57 and 59 are pivotally secured to the top of the mast 39 from a stationary wing-type pivot member 61. The other ends of each of these braces is pivotally secured to one of the

rods

29, 31, 33 and 35.

Thus it is apparent that as the pivot means 37 is raised upon the mast 39, the

rods

29, 31, 33 and 35 diverge tending to place them in a horizontal plane thereby urging the

frame members

11, 13, 15 and 17 outwardly apart from each other and placing the membrane 27 in tension. While the outward movement of the frame members is sufiicient to place the membrane 27 in tension it is insufiicient to urge the frame members to an outward extension comparable to their position if all were in a common plane. Thus the configuration formed with the pivot member 37 in its uppermost position is such as shown in FIGURE 1 with the frame members askew with respect to each other and the membrane 27 formed into a hyperbolic paraboloid.

With the umbrella structure in such a configuration as shown in FIGURE 1, it is apparent that the above mentioned disadvantages of the common umbrella of the prior art are obviated. Thus run-off from rain captured by the umbrella is dispensed only at the two lowermost corners of the hyperbolic paraboloid configuration. Moreover, the configuration can be rotated such that the upwardly extending corners are faced into the wind whereby the forces exerted by the wind will tend to urge the umbrella downward rather than into an inverted position as is common with the prior art umbrella. In addition, only four relatively smooth corners are formed by the structure whereby the umbrella is far less hazardous to those in its vicinity.

Moreover, the umbrella may be collapsed by merely lowering the pivot member 37 along the mast 39, as shown particularly in FIGURE 3. As the member 37 is lowered even further than is shown in FIGURE 3, the

frame members

11, 13, 15 and 17 assume substantially parallel relationship to the mast 39 such that the membrane 27, which upon collapse of the umbrella is completely relaxed, may be wrapped about the frame members as shown in FIGURE 4.

As the frame member is collapsed in the position shown in FIGURE 3, the coupling means 19 permits the indi vidual frame members to fold upon themselves. Moreover, since the

rods

29, 31, 33 and 35 are connected to the respective frame members 11, '13, 15 and 17 to permit rotation only in a plane defined by the respective rods and frame members, the individual frame members also rotate with respect to each other at the articulated coupling means 19. Thus, referring to FIGURE 5 as the umbrella structure is collapsed the

frame members

11 and 13 will not only close upon each other but will also rotate upon each other in a direction generally indicated by the arrows.

While the embodiment shown in FIGURES 1 to 6 employs a rod urging each of the

frame members

11, 13, 15 and 17 in an outward direction, it should be apparent that merely rods urging only two opposite ones of the frame members would be sufficient. The additional rods in the embodiment of FIGURES 1 to 6 serve primarily to stabilize the hyperbolic paraboloid structure on the mast.

If it is desired to vary the depth of the hyperbolic paraboloid, either of two adjustments are possible. The most obvious adjustment is in the degree in which the pivot means 37 is raised along the mast. A second adjustment is provided by the threaded studs 23 of the coupling means. By extending the coupling means the membrane 27 is placed in greater tension thereby deepening the hyperbolic paraboloid configuration.

Referring to FIGURE 7, an alternative embodiment of the invention is shown wherein elements similar to those expressed earlier employ like reference numerals. Generally speaking, the embodiment shown in FIGURE 7 is identical to the embodiment shown in FIGURES 1 to 6 with the exception that the

braces

55a and 59a are not merely pivotally connected to their associated

rods

31 and 35 but are also slidably connected by means of a slidable sleeve 63. In addition, wing nuts 65 serve to lock the slidable sleeve in any position axially along the

rods

31 and 35.

Thus in the embodiment shown in FIGURE 7 the angle of the hyperbolic paraboloid structure may be varied with respect to the mast 39 such for example, as shown in FIGURE 7 wherein one side of the umbrella structure is pitched upwardly while the other side is pitched substantially downwardly with respect to the top of the mast 39.

Referring to FIGURES 8, 9, 10 and 11, still another embodiment of the invention is shown. In this instance each of the frame members 11a, 13a, 15a and 17a are joined each to the other by coupling means 19. Means different from that shown in the embodiment of FIG- URES l to 6 are provided to urge the individual frame members apart from each other. In the present instance each of the frame members includes a pair of elongated slots 67 provided with enlarged openings 69.

Strut means 71 are connected between adjacent ones of the arms of the various frame members and are connected to the frame members at the elongated slot 67 by means of shouldered pins 73. Each of the pins are threaded in opposite directions and are received by the threaded tube 75 to operate in the manner of a turnbuckle. Thus upon rotating the tube 75 the shouldered arms 73 are spread apart thereby urging the associated frame members outwardly with respect to each other. While the embodiment of FIGURES 8 to 11 is shown employing four of the strut means 71 it is apparent that only two of the strut means will perform the function, any two of the strut means disposed in adjacent corners being adequate.

Referring to FIGURES 12 to 14 still another embodiment of the invention is shown wherein

frame members

11b, 13b, 15b and 17b are joined together at their ends by coupling means 19. The means for urging the frame members outwardly with respect to each other simply includes a single strut 77 having outward ends 79 and 81 secured to the

frame members

13b and 17b, respectively, together with a central tubular member 83. The

members

79 and 81 are each connected by oppositely threaded

members

85 and 87 to the central member 83. Thus upon rotation of a central member 83 the

frame members

13b and 17b may be spread apart. Upon spreading the

members

13b and 17b apart it is apparent that the members l lb and 15b Wi-ll likewise be spread when a membrane such as a membrane 27 is connected to the frame members. This is due to the fact that the tensioned membrane, seeking to reduce its size to its relaxed dimension will cause members 1312 and 17b to become skewed with respect to each other thereby carrying the frame members 11b and 15b also in a skewed direction. Thus the membrane will conform with the shape of the hyperbolic paraboloid.

Itis apparent that a new and improved structure has been provided which is suitable not only for the ordinary functions of an umbrella of the rain protection type but also as a beach umbrella or free standing structure. Moreover, it should be apparent that two or more of the umbrella structures described may be joined to form tent-like structures which are easily collapsible. The structure could also be used as a sail, a kite or other type of air foil due to its hyperbolic paraboloid shape.

I claim:

1. An umbrella structure comprising four rigid frame members, fully articulated coupling means connecting the ends of each of the frame members one to another for pivotal and rotational movement with respect to each other, a pliable resilient membrane secured along the length of each of the frame members, said membrane in relaxed condition being smaller in dimension than a planar quadrangle defined by said four frame member-s and the articulated coup-ling means and means secured intermediate the ends of at least two of said frame members for urging the frame members outwardly apart from each other.

2. An umbrella structure as defined in claim 1 together 3. An umbrella structure as defined in claim 1 wherein said means for urging the frame members outwardly apart from each other comprises first strut means connected between a first and second one of said frame members for urging said first and second frame members apart, said first and second frame members being adjacent to each other, andsecond strut means connected between said second one and a third one of said frame members, for urging said second and third frame members apart, said second and third frame members being adjacent to each other.

4. An umbrella structure as defined in claim 1 wherein said means for urging the frame members outwardly apart from each other comprises strut means secured at the center of two opposite frame members, said strut means including means for enlarging the distance be tween the ends thereof to apply a force tending to spread said opposite frame members.

5. An umbrella structure as defined in claim 4 wherein said strut means comprises an extensible linear rod.

6. An umbrella structure as defined in claim 4 wherein said strut means comprises first and second rods, one end of each of said rods being connected to the center of one of said opposite frame members and pivot means connecting the other ends of each of said rods.

7. An umbrella structure as defined in claim 6 together with an elongated mast, first and second braces, each having one end pivotally connected to said mast, the other end of each of said braces being pivotally connected to one of said rods at points intermediate the ends of said rods, said pivot means being axially slidably received by said mast, and means for releasably locking said pivot means at least one axial position along said mast.

8. An umbrella structure as defined in claim 7 wherein the connection of said pliable resilient membrane to the umbrella structure is to said frame members only.

9. An umbrella structure as defined in claim 7 wherein said other end of each of said braces is pivotally and slidably connected to one of said rods at points intermediate the ends of said rods, and means for releasably locking said other ends of the braces to prevent sliding movement along their respective rods.

References Cited by the Examiner UNITED STATES PATENTS 882,960 3/1908 Peterson 211- 178 2,274,139 2/1942 Goldthwait et a1. 21117-8 2,747,749 5/1956 Shore et a1 211178 2,794,556 6/1957 Lego 211178 2,963,031 12/1960 Carroll -7.1 X 3,060,949 10/1962 Moss 135-1 .HARRISON R. MOSELEY, Primary Examiner.

REINALDO P. MAC-HADO, Examiner.

L. J. SANTISI, Assistant Examiner.

Claims

1. AN UMBRELLA STRUCTURE COMPRISING FOUR RIGID FRAME MEMBERS, FULLY ARTICULATED COUPLING MEANS CONNECTING THE ENDS OF EACH OF THE FRAME MEMBERS ONE TO ANOTHER FOR PIVOTAL AND ROTATIONAL MOVEMENT WITH RESPECT TO EACH OTHER, A PILABLE RESILIENT MEMBERANE SECURED ALONG THE LENGTH OF EACH OF THE FRAME MEMBERS, SAID MEMBRANE IN RELAXED CONDITION BEING SMALLER IN DIMENSION THAN A PLANAR QUADRANGLE DEFINED BY SAID FOUR FRAME MEMBERS