HUB AND STRUT IN A RETICULATED FRAME
A plurality of hubs are joined to frame struts thereby forming a space frame structure, wherein the hubs have monolithic bodies with protruding joints adapted for receiving and joining with the frame struts using tubular sleeves. Axes of the joints are aligned to converge at a common point to avoid rotational moment forces on the hubs. The hubs are preferably fabricated by a 3D printing method in a structural material. In a method of the invention, the struts, joint diameters and joint lengths are sized and positioned to avoid interference between adjacent struts.
Application 61/503,323 filed Jun. 30, 2011; application Ser. No. 13/540,449 filed Jul. 2, 2012 and issued as U.S. Pat. No. 8,820,025B1 on Sep. 2, 2014. The prior patent discloses a similar invention to that which is disclosed herein. The inventor is common to both.
FIELD OF THE DISCLOSURE OF THE INVENTIONThe field of this invention relates to reticulated frame structures and space frames, and particularly to a novel hub capable of joining structural frame elements of such structures.
BACKGROUND AND PRIOR ART OF THE INVENTIONA reticulated frame is often referred to as a space frame because it is capable of covering large spaces with little interior support. It is typically a lightweight rigid structure having interlocking struts connected to hubs in a geometric pattern similar to a bridge truss. Like the well-known truss, such frames are strong because of the inherent rigidity of triangular beam arrangements where flexing loads and bending moments are transmitted as tension and compression vectors along the length of the beams. Such frames are common in building construction such as large roof spans in modern commercial and industrial buildings. Notable examples are the Stansted airport terminal in London, the Bank of China Tower, the Louvre Museum Pyramid, the Rogers Centre in Toronto, Ontario, and McCormick Place Lakeside Center in Chicago, Ill., USA. Large portable stages and lighting gantries are frequently built from such frames with octet trusses which are the structures of choice for holding signs above roads and in stadiums. The following documents have cited my prior patent U.S. Pat. No. 8,820,025B1 and are considered prior art in this application: US20150059263A1 and US9212479B1 to Devrim Pacaci, entitled “Supporting Framework Having Connection Hubs;” US20-150101645A1 to Garden Right, LLC, entitled “Dome Flubs, Dome Assembly Kits, and Dome Assembly Methods” CN106592762A to entitled Space assembling type bolt-column joint;“. CN106760235A to entitled Kind Of Multidirectional Adjustable Curved Surface Lighting Roof Grid System;” US20170167516A1 to Paul H. Mason, entitled “Strut Connector;”. US9731773B2 to Caterpillar Inc. entitled “-Node For A Space Frame;”. DE102016010883A1 to Technische Universitätm Chemnitz Variable, entitled “Connection Element,” CN110578370A to entitled “Bolt Ball For Steel Structure Connection;”. US20200109549A1 to Manuel Fernando and Bethencourt Cravid entitled “Lattice Structure”; and CNI 11042318A to , entitled “Single-Layer Aluminum Alloy Latticed Shell Box Type Modular Assembly Joint And Construction Process Thereof.”
SUMMARY OF THE INVENTIONIt should be recognized that the prior art does not teach a frame structure whereby frame elements converge to transfer loads to and from a common point at a hub thereby avoiding rotational moments in the hub. The invention teaches structure and methods whereby beam loads are transferred axially to hubs. This approach is beneficial in its ability to enable a direct load transfer between load bearing members mutually terminated within a common hub. The presently described hub is an essential joining element in the construction and operation of frames of the type described and shown. Uniquely, the hub is a one piece monolithic element functional as a node within a frame structure. In practice, a hub may be a terminal point within a frame structure, or it may join two or more struts of the frame. In one aspect of the presently described apparatus, the longitudinal axes of all struts which are joined to a single common hub pass through a common point. This avoids the possibility of force moments on, or within, the hub, important for passing tensile and compressive forces along the frame without unwanted stress being applied to the frame and without generating bending or shear forces on the struts or hubs. In another aspect of the invention, the axis of each strut is coaxial with a radius of a theoretical sphere of the hub body and may be selectively positioned within a range of angular positions all the while remaining co-radial with the theoretical sphere. Of course, this accounts for the benefit described in the preceding. In another aspect of the invention, the angular range of positions of each one of the struts relative to their connected hubs may be between 45° and 90°. In another aspect of the invention, each of the fasteners may have a threaded stud or a threaded entry and may be rotatable about its radially aligned axis thereby providing a simple and quick means for securely attaching one end of a strut to the fastener wherein the strut may be adapted for threadedly engaging the fastener. In another aspect of the invention, each one of the hubs may be rotatable enabling any position within a solid angle having a cone outer surface defined by the angular range of the possible extreme positions of the fastener. The details of one or more embodiments of these concepts are set forth herein and other features, objects, and advantages of these concepts will be apparent to those of skill in the art from this writing and drawings, and from the claims.
Embodiments of the invention are illustrated only as examples in the drawing figures accompanying this written description. Alpha-numerical call-outs are used to identify elements of the invention, wherein the same call-out refers to the same element as it may appear in various views of the figures.
In an embodiment of the invention, a frame structure (frame 5) is shown in
Embodiments of the subject apparatus and method of this invention have been described herein. Nevertheless, it will be understood that various modifications may be made without departing from the spirit and understanding of this disclosure. Accordingly, other embodiments and approaches are within the scope of the following claims.
Claims
1. A frame structure comprising:
- a plurality of struts engaged with a plurality of hubs;
- each of said hubs comprising a monolithic body with at least two integral hub joints integrally formed with said monolithic body; wherein each one of said hub joints is adapted for engaging an end of one of said struts; and wherein axes of said hub joints mutually converge.
2. The frame structure of claim 1 wherein at least one of said hub joints is an integral tubular projection extensive from said monolithic body.
3. The frame structure of claim 1 wherein said struts are of disparate sizes.
4. The frame structure of claim 3 wherein said hub joints are of disparate sizes corresponding to said disparate sizes of said struts.
5. The frame structure of claim 1 wherein at least one of said hubs is a product of a 3D printing method.
6. The frame structure of claim 1 wherein said end of said one of said struts is joined with one of said hub joints by a tubular sleeve.
7. The frame structure of claim 6 wherein said tubular sleeve is fastened to said one of said hub joints by an axially oriented fastener and to said strut by a transaxially oriented fastener.
8. A hub for integration into a frame structure said hub comprising:
- a monolithic body with at least two integral hub joints;
- wherein each one of said hub joints is adapted for engaging an end of a strut of said frame structure;
- and wherein axes of said hub joints mutually converge.
9. The hub of claim 8 Wherein at least one of said hub joints is a tubular projection relative to said monolithic body.
10. The hub of claim 9 wherein said hub joints are of disparate sizes.
11. The hub of claim 10 wherein said hub is a product of a 3D printing method.
12. A method of producing a frame structure wherein said method comprises:
- engaging a plurality of struts with a plurality of hubs;
- forming each one of said hubs into a monolithic body having at least two integral hub joints;
- adapting each one of said hub joints for engaging an end of one of said struts; and
- positioning said hub joints wherein axes of said hub joints mutually converge.
13. The method of claim 12 wherein said hub joints are produced as tubular projections of said monolithic body and said tubular projections are minimized in length.
14. The method of claim 13 wherein said struts are produced with disparate sizes.
15. The method of claim 14 wherein said hub joints are produced with disparate sizes corresponding to said disparate sizes of said struts.
16. The method of claim 12 wherein at least one of said hubs is produced by a 3D printing method.
17. The method of claim 12 wherein a tubular sleeve is positioned for joining said end of said one of said struts with said one of said hub joints.
18. The method of claim 17 wherein an axially oriented fastener is positioned for joining said tubular sleeve to said one of said hub joints.
19. The method of claim 17 wherein a transaxially oriented fastener is positioned for joining said tubular sleeve to said one of said struts.
Type: Application
Filed: Feb 4, 2022
Publication Date: Aug 10, 2023
Applicant: Oasys Technologies, Inc. (Wilmington, DE)
Inventor: Alexis Rochas (Los Angeles, CA)
Application Number: 17/665,155