Umbrella frame

Abstract

 A frame of an umbrella comprises a plurality of highly flexible plastic-made rib assemblies (1) pivotally connected to an upper nest (3) and a lower nest (4) of a shaft (2), wherein the rib assemblies (1) each includes a front rib (11), a front strut (12), a rear strut (13), a flexible rod (14), a mid rib (15) and a rear rib (16) that are pivotally connected in pairs, the upper nest (3) and the lower nest (4) are annularly formed on their respective outer surface with a plurality of notches (31,41), and the front rib (11) and the front strut (12) are pivoted positioned in the notches (31,41) by a highly flexible plastic pin (111), respectively.

Description

Field of the Invention

[0001] The present invention relates to an umbrella, and more particularly to an easily installable umbrella frame with high strength, wherein the sleeve is easily replaceable.

Description of the Prior Art

[0002] The ribs of a conventional umbrella are usually made of metal material, and the respective ribs are pivotally connected one another by copper pins or nails. After the ribs are connected to the upper and lower nests of the central shaft, a metal wire should be used to bind the respective ribs around the shaft. However, the copper pins for connecting the ribs are not only expensive, requiring complicated production process, but also are susceptible to rust. And if the ribs are rusted, they will have no sufficient strength to withstand bending and twisting caused by windy weathers or accidental impacts. In addition, binding the ribs around the upper and lower nests of the shaft with the metal wire is time-consuming and uneconomic.

[0003] The present invention has arisen to mitigate and/or obviate the afore-described disadvantages.

[0004] The primary objective of the present invention is to provide an easily installable umbrella frame, wherein the rib assemblies are pivotally engaged with the upper and lower nests.

[0005] The secondary objective of the present invention is to provide an antirust umbrella frame with high strength, wherein the rib assemblies are pivoted positioned in the notches by high flexible plastic made pins.

SUMMARY OF THE INVENTION

[0006] The present invention provides an umbrella frame as defined in the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS

[0007] 

Fig. 1 is a side view of an umbrella frame in accordance with a first embodiment of the present invention;

Fig. 2 is an exploded view showing the rib assembly in accordance with the present invention;

Fig. 3 is an exploded view showing the umbrella frame in accordance with the present invention;

Fig. 4 is an assembly view showing the rib assembly in accordance with the present invention;

Fig. 5 is an assembly view showing the upper and lower nests for the umbrella frame in accordance with the present invention;

Fig. 6 is an exploded view showing the lower nest and the sleeve thereof in accordance with the present invention; and

Fig. 7 is an exploded view showing the lower nest and the sleeve thereof in accordance with another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Referring to Fig. 1, a frame of an umbrella in accordance with a preferred embodiment of the present invention is shown and comprises a plurality of high flexible plastic-made rib assemblies 1 pivotally connected to an upper nest 3 and a lower nest 4 of a shaft 2. The rib assemblies 1, as shown in Fig. 2, each includes a front rib 11, a front strut 12, a rear strut 13, a flexible rod 14, a mid rib 15 and a rear rib 16 that are pivotally connected in pairs by high flexible plastic made pins 111, 121, 131, 141, 151 and 161. As shown in Figs. 3 and 4, the shaft 2 is provided at its top end with the upper nest 3 that is annularly formed with a plurality of notches 31. The respective front ribs 11 are pivotally locked in the notches 31 by using the pins 111, and then an upper ring 5 is mounted on the top surface of the upper nest 3. After that, a cover 6 is screwed to the top end of the shaft 12 to position the upper ring 5. The lower nest 4 is moveably mounted on the shaft 12 and located below the upper nest 3, in the peripheral surface of the lower nest 4 are annularly formed a plurality of notches 41 for engaging the pin 121 at the end of the front strut 12, and then a lower ring 7 is mounted onto the bottom surface of the lower nest 4.

[0009] With reference to Figs. 5-7□in the bottom of the lower nest 4 is formed a groove 42 for positioning of the ribs after the umbrella is fully opened, and to the lower periphery of the lower nest 4 is attached a sleeve 8. On the surface of the surface of the sleeve 8 can be arranged a press button.

Claims

1. A frame of an umbrella comprising a plurality of flexible plastic rib assemblies pivotally connected to an upper nest and a lower nest of a shaft, wherein each of the rib assemblies includes a front rib, a front strut, a rear strut, a flexible rod, a mid rib and a rear rib that are pivotally connected in pairs, the upper nest and the lower nest are annularly formed on their respective outer surface with a plurality of notches, and the front rib and the front strut are pivoted positioned in the notches by a flexible plastic pin, respectively

2. The frame of an umbrella as claimed in claim 1, wherein an upper ring is mounted on a top surface of the upper nest, and then a cover is screwed to the top end of the shaft to position the upper ring.

3. The frame of an umbrella as claimed in claim 1, wherein a lower ring is mounted onto a bottom surface of the lower nest.

4. The frame of an umbrella as claimed in claim 1, wherein a sleeve is attached to a lower periphery of the lower nest.

5. The frame of an umbrella as claimed in claim 4, wherein a press button is arranged on a surface of the surface of the sleeve.

Drawing