The present invention relates to umbrella technology and more particularly, to an umbrella frame bending structure for two-fold inverted umbrella, which uses bending devices to limit the extending distance of the main ribs when the umbrella is opened, causing the main ribs to curve.
In a conventional inverted umbrella, the main ribs of the umbrella frame are loaded with spring members. When the umbrella frame is opened, the spring members are compressed so that the elastic restoring forcer of the spring members forces the main ribs to curve. The loading of these spring members greatly increases the cost of the umbrella frame and complicates its installation. Further, the spring members will fail to work normally due to elastic fatigue after a long use.
The present invention has been accomplished under the circumstances in view. It is therefore the main object of the present invention to provide an umbrella frame bending structure for two-fold inverted umbrella having the advantages of low cost, simple structure and ease of installation, which has bending devices are arranged on the umbrella frame thereof such that when the main ribs and auxiliary ribs of the umbrella frame are opened, the auxiliary ribs limit the opening distance of the main ribs, causing the main ribs to curve.
To achieve this and other objects of the present invention, an umbrella frame bending structure for two-fold inverted umbrella comprises an umbrella shaft assembly, an umbrella frame and a plurality of bending devices. The umbrella shaft assembly comprises an umbrella shaft, a handle connected to one end of the umbrella shaft, and a runner sleeved onto the umbrella shaft and movable back and forth along the umbrella shaft from an opposite end of the umbrella shaft remote from the handle. The umbrella frame comprises a plurality of main ribs, a plurality of auxiliary ribs, and a plurality of stretchers. Each main rib comprises a first main rib segment and a second main rib segment pivotally connected together. The first main rib segment has a distal end thereof connected to the opposite end of the umbrella shaft remote from the handle. Each auxiliary rib has one end thereof connected to the runner. Each stretcher has one end thereof connected to the runner, and an opposite end thereof connected to the first main rib segment of one respective main rib. Each bending device comprises a stop block and a position-limiting member. The stop block is protruded from the second main rib segment of one respective main rib between two ends thereof so that the second main rib segment defines a sliding portion between the distal end thereof and the respective stop block. The position-limiting member comprises a channel slidably coupled to the sliding portion of the second main rib segment of one respective main rib, and an engagement portion protruded from an inside wall of the channel. The auxiliary rib has the distal end thereof connected to the position-limiting member of one respective bending device. When the umbrella frame is closed, the first main rib segments and second main rib segments of the main ribs are received together and disposed close to the umbrella shaft. When the umbrella frame is opened to move the runner along the umbrella shaft in direction away from the handle, the stretchers push the first main rib segments of the main ribs to cause extension of the respective second main rib segments in direction away from the umbrella shaft, and the stop blocks are forced to stop against the engagement portions of the respective position-limiting member to further keep the first main rib segments and the second main rib segments to position near a parallel state, thereafter the stretchers are forced to move the pivot connection areas between the first main rib segments and the second main rib segments, causing the first main rib segments and the second main rib segments to curve.
Other advantages and features of the present invention will be fully understood by reference to the following specification in conjunction with the accompanying drawings.
Referring to
The umbrella shaft assembly 1 comprises an umbrella shaft 11, a handle 13 connected to one end of the umbrella shaft 11, and a runner 12 is sleeved onto the umbrella shaft 11 and displaced back and forth away from the other side of the handle 13. The runner 12 comprises an upper nest 121 disposed at one side thereof remote from the handle 13, and a lower nest 122 disposed at an opposite side thereof.
The umbrella frame 2 comprises a plurality of main ribs 21, a plurality of auxiliary ribs 22, a plurality of stretchers 23, a plurality of connection rods 24 and a plurality of elastic members 25. Each main rib 21 comprises a first main rib segment 211 and a second main rib segment 212 pivotally connected together. The first main rib segment 211 has the distal end thereof connected to the umbrella shaft 11. Each auxiliary rib 22 has one end thereof pivotally connected to the lower nest 122 of the runner 12 of the umbrella shaft assembly 1. Each stretcher 23 has one end thereof connected to the runner 12, and an opposite end thereof connected to the first main rib segment 211 of one respective main rib 21. Each connection rod 24 has one end thereof connected between the first main rib segment 211 and second main rib segment 212 of one respective main rib 21, and an opposite end thereof conned between the two ends of one respective auxiliary rib 22. The elastic members 25 are respectively connected between the connection rods 24 and the stretchers 23.
The bending device 3 comprised a plurality of stop blocks 31 and a plurality of position-limiting members 32. Each stop block 31 protrudes from the second main rib segment 212 of one respective main rib 21 of the umbrella frame 2 between two ends thereof so that the second main rib segment 212 defines a sliding portion 213 between the stop block 31 and the distal end thereof. Each position-limiting member 32 comprises a channel 321, and an engagement portion 322 protruded from an inside wall of the channel 321. By means of the channel 321, the position-limiting member 32 is sleeved onto the sliding portion 213 of one respective main rib 21. The distal end of each auxiliary rib 22 is connected to one respective position-limiting member 32.
The canopy 4 comprises an outer canopy cloth 41 fastened to the main ribs 21 at a top side, a plurality of outer tips 43 equiangularly affixed to a border edge of the outer canopy cloth 41 for the connection of the distal ends of the second main rib segments 212 of the main ribs 21, an inner canopy cloth 42 fastened to the auxiliary ribs 22 at a bottom side, and a plurality of inner tips 44 equiangularly affixed to a border edge of the inner canopy cloth 42 for the connection of the distal ends of the auxiliary rib 22.
Please refer to
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