US2621670A - Means to facilitate the opening of umbrellas of reducible length - Google Patents

Description

Dec. 16, 1952 H. WUSTER 2,621,670

MEANS TO FACILITATE THE OPENING OF UMBRELLAS OF REDUCIBLE LENGTH Filed Nov. 7, 1950 Fig.1 Fig.2

IN V EN TOR.

HE INK/ca M03715 rc.

Patented Dec. 16, 1952 MEANS TO FACILITATE THE OPENING OF UMBRELLAS OF REDUCIBLE LENGTH Heinrich Wiister, Vienna, Austria Application November 7, 1950, Serial No. 194,477 In Austria November 10, 1949 2 Claims. (Cl. 135-22) the ribs often do not spread but the rib sections telescope back into each other. To prevent this, devices have been provided which give the rib structure a certain resilient initial opening bias so that the ribs come into an initial position in which the force exercised on them by the spreaders has a sufiiciently large component acting in the sense of the spreading movement of the ribs.

The invention provides a particularly simple device of this type, which consists, according to the main feature of the invention, of a pressure disk of resilient material, preferably of sheet steel, which is firmly supported or clamped in the crown of the umbrella, and the rim of which cooperates with projections provided at the inner rib sections adjacent to their linking points, in such a manner as to exercise on said ribs a force whereby they are urged apart. The pressure disk is preferably of slight convexity for improved spring action.

Distinguished by its great simplicity, the structure according to the invention provides the advantage of simple assembly and invariably reliable service through a long period of use.

The accompanying drawings illustrate an umbrella embodying the invention by way of example.

Fig. 1 being a longitudinal sectional View taken through the crown of the umbrella with the upper portions of the ribs linked thereto; and

Fig. 2 showing on a greatly reduced scale the rib structure in its closed position, with its initial opening which is achieved by the means provided by the invention.

In Fig. 1, numeral l designates the top part of this stick, on which the crown 2 is stuck. The inner ends of the ribs or rib sections 3 are linked or bound in the manner known to the crown. Each rib or rib section 3 has a projection 4 which coacts with the free rim of a disk 5, which in the embodiment shown by way of example is centrally supported in the crown by means of the nut 6, which also serves for locating the crown 2 at the end of the stick. The disk 5 is of resilient material, preferably of sheet steel, so that it exercises on the projections 4 a resilient pressure whereby the ribs or rib sections are moved into an initial angular position, so that, as can be seen from Fig. 2, the rib structure is given a resilient initial opening. This affords the advantage that the spreaders 7 attack at the ribs 3 with a sufficiently large angle a at the beginning of the spreading movement, so that as the runner 8 is passed upwardly a sufliciently large component of force is produced which acts on the ribs in the sense of their spreading movement, whereby the opening of the ribs is facilitated. In umbrellas of reducible length it is ensured, moreover, that as the runner is passed upwardly the rib sections cannot telescope into each other but are being spread in their extended position.

What I claim is:

1. In a collapsible umbrella comprising a telescopic stick, a crown fixed to said stick, and telescopic ribs linked to said crown, the provision of a projection on each rib adjacent to its linking point and a resilient sheet steel pressure disk connected to the crown and having a free rim portion which is adapted to bear on said projections when the ribs are in a folded position and to exercise pressure on said ribs to urge them apart.

2. In a collapsible umbrella comprising a telescopic stick, a crown fixed to said stick, and telescopic ribs linked to said crown the provision of a projection on each rib adjacent to its linking point and a resilient sheet steel pressure disk connected to the crown and having a free rim portion which is adapted to bear on said projections when the ribs are in a folded position and to exercise pressure on said ribs to urge them apart, said disk being upwardly convex when unstressed.

' HEINRICH WUSTER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,708,214 Burris Apr. 9, 1929 2,443,772 Mappin June 22, 1948 FOREIGN PATENTS Number Country Date 532,375 Great Britain Jan. 22, 1941 625,783 Germany Feb. 15, 1936

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