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In a portable shelter frame, a frame support is selectively articulable between an erected state and a collapsed state. The frame support includes a central frame member; a pair of upper arcuate frame members rotatably coupled to the ends of the central frame member, each pair of frame upper frame m

In a portable shelter frame, a frame support is selectively articulable between an erected state and a collapsed state. The frame support includes a central frame member; a pair of upper arcuate frame members rotatably coupled to the ends of the central frame member, each pair of frame upper frame members being selectively moveable between a first, fixed position when the frame support is in the erected state and a second, fixed position when the frame support is in the collapsed state; and a pair of lower arcuate frame members rotatably coupled to the other ends of the upper arcuate frame members, each pair of frame lower frame members being selectively moveable between a first, fixed position when the frame support is in the erected state and a second, fixed position when the frame support is in the collapsed state. A frame assembly may include two more of the frame supports, purlin assemblies interconnecting the frame supports, respectively, each purlin assembly including first and second purlin members rotatably coupled about a purlin mid-joint, a first end of the purlin assembly being pivotally coupled to one of the frame supports, and a second end of the purlin assembly being pivotally coupled to another frame support, the purlin assembly being selectively lockable in an extended position when the frame is in the erected state, the purlin members being rotatable to a folded position when the frame is in the collapsed state.

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1. A frame support for a portable shelter frame, the frame support being selectively articulable between an erected state and a collapsed state, the frame support comprising: a central frame member;a pair of upper arcuate frame members;a pair of first joints each coupled to one end of the central fr

1. A frame support for a portable shelter frame, the frame support being selectively articulable between an erected state and a collapsed state, the frame support comprising: a central frame member;a pair of upper arcuate frame members;a pair of first joints each coupled to one end of the central frame member, and respectively to one end of each of the pair of upper arcuate frame members, so that the upper arcuate frame members are rotatably coupled to the central frame member, and so that each pair of upper arcuate frame members is selectively moveable between a first, fixed position when the frame support is in the erected state and a second, fixed position when the frame support is in the collapsed state;a pair of lower arcuate frame members; anda pair of second joints each coupled respectively to the other ends of the pair of upper arcuate frame members, and to one end of each of the pair of lower arcuate frame members, so that respective ones of upper and lower arcuate frame members are rotatably coupled to each other, and so that each pair of lower arcuate frame members is selectively moveable between a first, fixed position when the frame support is in the erected state and a second, fixed position when the frame support is in the collapsed state,wherein the second joints each include a guide pin and an arcuate slot, wherein the guide pin travels within the arcuate slot as the lower arcuate frame member moves between the first, fixed position and the second, fixed position. 2. The frame support of claim 1, wherein the first joints and the second joints each comprise a pivot pin assembly defining an axis of rotation of the respective joints. 3. A frame assembly comprising at least first and second frame supports according to claim 1, the frame assembly further comprising a plurality of purlin assemblies interconnecting the first and second frame supports,each purlin assembly including first and second purlin members rotatably coupled about a purlin mid-joint, and each purlin assembly being selectively lockable in an extended position when the frame is in the erected state, the purlin members being rotatable to a folded position when the frame is in the collapsed state,the purlin assemblies being pivotally coupled to the first frame support and the second frame support at their respective first and second joints. 4. The frame assembly of claim 3, wherein each purlin assembly further comprises a sleeve slidably associated with the first purlin member, the sleeve being selectively positionable to lockingly engage the purlin assembly mid-joint. 5. The frame assembly of claim 3, wherein the first purlin member is rotatable about the axis of rotation of the first respective joint. 6. The frame assembly of claim 5, wherein the first purlin member is rotatable about a second axis of rotation normal to the axis of rotation of the first respective joint. 7. The frame assembly of claim 6, wherein the second purlin member is rotatable about the axis of rotation of the second respective joint. 8. The frame assembly of claim 6, wherein the first purlin member is rotatable about a second axis of rotation normal to the axis of rotation of the first respective joint, and wherein the second purlin member is rotatable about a third axis of rotation normal to the axis of rotation of the second respective joint. 9. The frame assembly of claim 3, wherein the first joints each include a guide pin and an arcuate slot, wherein the guide pin travels within the arcuate slot as the upper arcuate frame member moves between the first, fixed position and the second, fixed position, and wherein each guide pin has a lug at one end thereof for coupling to one of the purlin assemblies. 10. A frame assembly comprising at least first, second, and third frame supports according to claim 1, the first and second frame supports being positioned at opposite ends of the frame assembly, and the third frame support being positioned between the first and second frame supports, the frame assembly further comprising a plurality of purlin assemblies interconnecting the first, second, and third frame supports,each purlin assembly including first and second purlin members rotatably coupled about a purlin mid-joint, and each purlin assembly being selectively lockable in an extended position when the frame is in the erected state, the purlin members being rotatable to a folded position when the frame is in the collapsed state,some of the purlin assemblies being pivotally coupled to the first frame support and third frame support at their respective first and second joints, and the other purlin assemblies being pivotally coupled to the second frame support and the third frame support at their respective first and second joints. 11. The frame assembly of claim 10, wherein each of the first joints for the first and second frame supports includes a guide pin and an arcuate slot, wherein the guide pin travels within the arcuate slot as the upper arcuate frame member moves between the first, fixed position and the second, fixed position, and wherein each guide pin has a lug at one end thereof for coupling to one of the purlin assemblies. 12. The frame assembly of claim 10, wherein each of the first joints for the third frame support includes a guide pin and an arcuate slot, wherein the guide pin travels within the arcuate slot as the upper arcuate frame member moves between the first, fixed position and the second, fixed position, and wherein each guide pin has a lug at opposite ends thereof for coupling to two of the purlin assemblies. 13. The frame assembly of claim 10, further comprising two or more additional frame supports according to claim 1, the additional two or more frame supports also being disposed between the first and second frame supports, the frame assembly further comprising additional purlin assemblies according to claim 10, the additional purlin assemblies interconnecting the two or more additional frame supports to the first, second, and/or third frame supports at their respective first and second joints. 14. A frame support for a portable shelter frame, the frame support being selectively articulable between an erected state and a collapsed state, the frame support comprising: a central frame member;a pair of upper arcuate frame members;a pair of first joints each coupled to one end of the central frame member, and respectively to one end of each of the pair of upper arcuate frame members, so that the upper arcuate frame members are rotatably coupled to the central frame member, and so that each pair of upper arcuate frame members is selectively moveable between a first, fixed position when the frame support is in the erected state and a second, fixed position when the frame support is in the collapsed state;a pair of lower arcuate frame members; anda pair of second joints each coupled respectively to the other ends of the pair of upper arcuate frame members, and to one end of each of the pair of lower arcuate frame members, so that respective ones of upper and lower arcuate frame members are rotatably coupled to each other, and so that each pair of lower arcuate frame members is selectively moveable between a first, fixed position when the frame support is in the erected state and a second, fixed position when the frame support is in the collapsed state,wherein the first joints each include a guide pin and an arcuate slot, wherein the guide pin travels within the arcuate slot as the upper arcuate frame member moves between the first, fixed position and the second, fixed position. 15. The frame support of claim 14, the first joints comprise outer and inner guide plates, each of the outer and inner guide plates having a guide pin bore with a cross section having an arcuate portion and a flat portion, and wherein the guide pin has a cross section corresponding to that of the guide pin bore, so that the guide pin is prevented from rotating in the guide pin bore as the guide pin travels within the arcuate slot. 16. A frame support for a portable shelter frame, the frame support being selectively articulable between an erected state and a collapsed state, the frame support comprising: a central frame member;a pair of upper arcuate frame members;a pair of first joints each coupled to one end of the central frame member, and respectively to one end of each of the pair of upper arcuate frame members, so that the upper arcuate frame members are rotatably coupled to the central frame member, and so that each pair of upper arcuate frame members is selectively moveable between a first, fixed position when the frame support is in the erected state and a second, fixed position when the frame support is in the collapsed state;a pair of lower arcuate frame members; anda pair of second joints each coupled respectively to the other ends of the pair of upper arcuate frame members, and to one end of each of the pair of lower arcuate frame members, so that respective ones of upper and lower arcuate frame members are rotatably coupled to each other, and so that each pair of lower arcuate frame members is selectively moveable between a first, fixed position when the frame support is in the erected state and a second, fixed position when the frame support is in the collapsed state,wherein an arc length of an arcuate slot of the second joints is greater than an arc length of an arcuate slot of the first joints. 17. A joint for connecting two arcuate frame members, the joint comprising: at least first and second plate members;a pivot pin assembly defining an axis of rotation between the first and second plate members; anda guide pin associated with the first plate member and an arcuate slot disposed in the second plate member, wherein the guide pin travels within the arcuate slot as one of the two arcuate frame members moves between a first, fixed position and a second, fixed position,wherein the at least first and second plate members include a guide pin bore with a cross section having an arcuate portion and a flat portion, and wherein the guide pin has a cross section corresponding to that of the guide pin bore, so that the guide pin is prevented from rotating in the guide pin bore as the guide pin travels within the arcuate slot. 18. The joint of claim 17, wherein each guide pin has a lug at one end thereof for coupling to a purlin assembly. 19. The joint of claim 17, wherein each guide pin has a lug at opposite ends thereof for coupling to respective purlin assemblies.