Foldable articulated arm

摘要

It is described a foldable articulated arm comprising a first rod-shaped element, a second rod-shaped element and a third rod-shaped element foldable one another and at least three stretching element of the rod-shaped elements, arranged to form a system of four-bar linkages, further comprising a plurality of joint elements of the rod-shaped elements and the stretching elements and having, at the opposite ends, a retaining mechanism for a respective combining with a tube and an umbrella sheet, wherein the rod-shaped elements, the joint elements, the stretching elements and the retaining mechanism are all made integral in a single piece of plastic material constituting the foldable articulated arm.

主权项

1. A foldable articulated arm comprising:
a first rod-shaped element, a second rod-shaped element and a third rod-shaped element foldable one to another; at least three stretching elements connected to the rod-shaped elements to form a system of four-bar linkages, a plurality of joint elements connected to the rod-shaped elements and the stretching elements and having, at opposite ends, retaining means for a respective combining with a tube and an umbrella sheet, wherein the rod-shaped elements, the joint elements, the stretching elements and the retaining means are together constructed of a single piece of plastic material constituting the foldable articulated arm; wherein of the at least three stretching elements, a first stretching element has one free end and one opposite end hinged to the first rod-shaped element, a second stretching element has one end hinged to the first stretching element and one opposite end hinged to the second rod-shaped element and a third stretching element has one end hinged to the first rod-shaped element and one opposite end hinged to one end of the third rod-shaped element, and wherein the third stretching element comprises a flexible ribbon; a runner slidable on the second rod-shaped element and constraining the flexible ribbon of the third stretching element to the second rod-shared element; wherein the second stretching element comprises a flexible ribbon having one end combined with a back side of the second rod-shaped element and one end with the first stretching element.