JPH04269257A - Projecting arm for sunshade - Google Patents

Abstract

PURPOSE: To apply a tension to an awning cloth even when it is partially spread by eccentrically setting an hinge shaft of a folding arm which supports the cloth, with both arms connected together through a tensile spring and chain. CONSTITUTION: An axial core 24 of a pin 23 which hinges horizontally-bent folding arms 15 and 16 that support an awning cloth set on a window, etc., is eccentrically set by 'A' from arm's folding side end-surface 25. The arms 15 and 16 are connected together through a tensile spring 31 and chain 29. When the arms 15 and 16 are folded, a tension acts always. Thus, a tension is applied to an awning cloth even when it is partially spread.

Description

[Detailed description of the invention]

0001

FIELD OF INDUSTRIAL APPLICATION The present invention has two legs connected to each other by a pivot joint defining a pivot axis extending substantially vertically; at least one pretensioned spring is arranged on the inner leg on the side of the carrying device, which is connected to the carrier device by a pivot joint and to the ejector tube by a pivot joint;
The spring is connected in engagement with the outer leg outside the axis of rotation by a deflectable but longitudinally invariant transmission member, the transmission member being connected to the axis of rotation of the pivot joint. relating to the projecting arm of the sunshade, which is guided via a guide surface concentric with the sunshade, the at least one spring being connected at its end remote from the transmission element to the carrier device or to the inner leg; It is something.

0002

2. Description of the Related Art This type of protruding arm is widely used for so-called bendable arm sunshades. A spring mounted in at least one of the legs acts in the direction of extending the extrusion arm to tension the shade when the extrusion arm is extended, and in particular to tension the shade cloth sufficiently in the extended position of the extrusion arm. Guaranteed to make you nervous.

In the recently popular extension arms, the spring is constructed as a tension spring and the transmission element is correspondingly constructed as a tension transmission element. In the following, therefore, we will concentrate on tension springs and tension transmission elements, but in principle it is also possible to operate with compression springs having the opposite kinematic properties. This compression spring is also effective in eliminating the following drawbacks.

Conventionally, steel wire, steel bands, or chains have been used as the tension transmission member provided at the pivot joint.

The advantage of using chains is that they have a relatively narrow bending radius and there is no risk of breaking, especially after long-term use. On the other hand, the disadvantage of using chains to absorb and transmit the large amounts of elasticity required is that they are relatively bulky and that the use of chains imposes structural constraints.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a system that can exert a large extension force on the protruding arm, and in particular can obtain this large extension force even when partially expanding the sunshade. The purpose is to construct a protruding arm of the type mentioned at the outset.

[0007]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a structure in which the rotation axis is located on the inner side of the protruding arm so that the rotation axis is on the outside of the longitudinal extension line of the inner leg. It is characterized in that it is arranged between the leg and the outer leg, offset outwardly towards the bending area.

In other words, the pivot axis does not lie inside the extension of the inner leg, or in the inner longitudinal region as is conventional, but on the outside. The inner longitudinal side is the longitudinal side that lies in the bending region between the legs when the ejector arm is bent. This long side is usually opposite the outer narrow side of the shade fabric with respect to the whole shade.

Advantageously, the pivot axis lies approximately 5 to 15 mm, in particular approximately 8 mm, outside the inner longitudinal side.

[0010] If the tension transmission element is constructed by two chains running parallel to one another, the offset of the rotational axes is particularly advantageous.

[0011]

Embodiments Next, embodiments of the present invention will be described with reference to the accompanying drawings.

The sunshade shown in FIG. 1 has a carrier device 1 which is fixed to the wall of a house or the like. The carrier device 1 includes a winding shaft 4 rotatably supported by support plates 2 and 3. The winding shaft 4 can be driven in rotation in a known manner, and according to FIG. 1 can be driven in rotation using a self-braking transmission 5. The transmission 5 can be driven via a crankshaft 6 which can be suspended. It goes without saying that instead of the transmission 5 with the crank rod 6, a generally known electric drive, belt drive, etc. may be used. Furthermore, as a component of the carrier device 1, a carrier tube 7 with a square cross section is mounted between the support plates 2 and 3. A projecting arm 9 is attached to the carrier tube 7 in a so-called folding manner using a holding and tilting device 8 . Each of the protruding arms 9 is divided at the center and is provided with a pivoting member 10 whose axis is directed in the vertical direction. The ejector arms 9 are each pivotally connected to a suitable device 8 by a similar pivot 11 and are connected to the ejector tube 1 by means of corresponding pivots not shown in the drawings.
It is pivoted to 2. The ejector tube 12 can thus move in a plane common to the winding axis 4, while not carrying out any movement in a direction perpendicular to this plane.

A rectangular sunshade cloth 13 is fixed to the winding shaft 4. The sunshade cloth 13 can be wound onto or unwound from the winding shaft 4 by rotating the winding shaft 4 as described above. Sunshade cloth 13
is fixed to the ejector tube 12 in a known manner. A so-called ruffle decoration 14 is attached to the protruding tube 12. Carrying device 1, ejection arm 9 and ejection tube 1
2, the position of the ejector arm 9 is adjusted as follows when attached to the wall, that is, the surface stretched by the ejector tube 12 and the winding shaft 4 is positioned downward from the winding shaft 4. The position is adjusted so that it extends toward the ejector tube 12 at an angle with respect to the horizontal line.

As can be seen in FIGS. 2 to 5, each ejector arm 9 has an inner leg 15 and an outer leg 16. As can be seen in FIGS.

The inner leg 15 has a pivot plate 17 with a pivot hole 18 . The inner leg 15 is connected to the carrier device 1 via a pivot plate 17 .

A pivot portion 19 is provided on the outer surface of the inner leg portion 15.
is formed. As can be seen from FIG. 5, the pivot portion 19 includes two pivot plates 20 spaced apart from each other.
, 21.

A pivot portion 22 is similarly formed on the inner surface of the outer leg portion 16. The pivot portion 22 connects the pivot plates 20 and 2.
1. A pivot pin 23 passes through the pivot plates 20, 21 and the pivot portion 22 and defines a pivot axis 24.

As can be seen in particular from FIGS. 2 and 3, the pivot axis 24 is offset outwardly by both A with respect to the longitudinal side 25 of the leg 15 inside.

The pivot part 22 of the outer pivot axis 16 has a guide surface 26 which is offset rearwardly relative to the pivot parts 20, 21, as shown in broken lines in FIG. Information surface 26
As can be seen from FIG. 5, two chains 29 and 30, which are arranged one above the other and extend parallel to each other, are fixed using screw holes 27 and 28. chain 29,3
0 is deflected by the guide surface 26 as can be seen in FIG. That is, these chains 29, 30 have threaded holes 27,
It is connected to the outer leg 16 via 28, but extends inside the inner leg 15 and is connected there to a coiled tension spring 31 as shown in FIG.

The other inner end of the coil tension spring 31 is fixed to a fixing bolt 32. The fixing bolt 32 is fixed to the sealing member 34 via a screw 33.

The coil tension spring 31, or possibly two identical coil tension springs arranged one above the other, exerts a tension force on the chains 29, 30, which forces the outer leg 16 to rotate. A torque acts about axis 24 . This torque acts to extend the ejection arm 9 as shown in FIG.

In FIGS. 3 and 4, the active lever arm X1 or X2 is shown in both end positions, ie in a fully extended position and in a fully bent position. The effective lever arm X1 becomes smaller as the bending increases, and therefore the extension torque also becomes smaller.

According to the invention, by displacing the pivot axis 24 outwardly away from the inner longitudinal side 25 of the inner leg 15, an effective lever is created which guarantees a sufficient extension torque even in the flexed state. An arm X2 is provided. This is accomplished by using two thin chains parallel to each other instead of the conventional single relatively thick chain. The use of such a chain also has the additional advantage of being able to reliably transmit greater spring tension forces. On the other hand, the division of the tensile force into two chains divides the tensile force into two areas in the engagement region, resulting in a reduction in local loads and a symmetrical overall load. Next, advantageous configurations of the present invention will be listed.

(1) The rotation axis (24) is located on the inner longitudinal side (
25), characterized in that it is approximately 5 to 15 mm outward, preferably approximately 8 mm.

(2) A protruding arm characterized in that the tension transmission member is constituted by two chains (29, 30) extending parallel to each other and overlapping each other.

[0026]

According to the present invention, the change in ejection force can be optimized depending on the ejection distance. This means that the lever arm that exerts the elastic force on the outer leg is larger and thus provides a better torque, so that for the partially flexed position the effective lever arm can be adjusted to its maximum extent when the shade is fully extended. A suitable ejection force can be obtained even when the ejection force is smaller than the case.

By adopting a double chain configuration in which two chains extend overlapping each other, the diameter of the individual chains can be reduced and it is therefore very easy to shift the rotational axis outward. . For example, when using a single appropriately thick chain, it is not possible to shift the pivot axis outward to a significant extent, which would affect the ejection curve.

Furthermore, despite its thinness, this double chain configuration is capable of generating and transmitting large elastic tension forces.

[Brief explanation of the drawing]

1 is a perspective view of a bendable sunshade with a protruding arm according to the invention; FIG.

FIG. 2 is a longitudinal sectional view of the inner leg and pivot area of the ejector arm according to the invention;

3 is a view corresponding to FIG. 2 showing the pivot area in an extended state; FIG.

4 is a view corresponding to FIG. 3 showing the sunshade in a fully bent state; FIG.

5 is a side sectional view of the inner surface of the bending region of the portion illustrated in FIG. 3; FIG.

[Explanation of symbols]

9 Protruding arm 15
Inner leg 16 Outer leg 24 Rotation axis

Claims (1)

[Claims] Claim 1: Two legs connected to each other by a pivot joint defining a pivot axis extending substantially vertically, the legs being carried by the pivot joint. At least one pretensioned spring is arranged on the inner leg on the side of the carrier device, which is connected to the device and connected to the ejector tube by means of a pivot joint, the spring being flexible but not longitudinally Due to the direction-invariant transmission member,
the at least one spring is coupled in engagement with the outer leg outside the pivot axis, the transmission member being guided via a guide surface concentric to the pivot axis of the pivot joint; In the projecting arm of the sunshade, which is connected at the end of the spring remote from the transmission element to the carrier device or to the inner leg, the pivot axis (24) lies on the longitudinal side of the inner leg (15). (2
5), a pivot axis (24) between the inner leg (15) and the outer leg (16) of the ejector arm (9) extends outward towards the bending area. A protruding arm of an awning characterized by being arranged in a staggered manner.