Canvas shaft holder

Abstract

The invention relates to a canvas shaft holder for an awning having a canvas shaft, on which an awning canvas can be wound, and having at least one shaft end piece, which is inserted into the canvas shaft in an axial end region thereof, wherein the shaft end piece is connected to the canvas shaft in a force-fitting manner. A pressing part, which is inserted axially into the canvas shaft, is movable relative to the shaft end piece and / or to the canvas shaft in the axial direction of the canvas shaft between a clamping position and a release position and, in the clamping position, exerts a radial pressing force on the shaft end piece and clamps the latter against an inner wall of the canvas shaft. The canvas shaft holder has at least one clamping bar which is guided through the pressing part and the shaft end piece and by means of which the pressing part is movable from the release position into the clamping position.

Description

[0001] Roller shaft holder

[0002] The invention relates to a fabric shaft holder for an awning with a fabric shaft on which an awning fabric can be wound up, and with at least one shaft end piece which is inserted into the fabric shaft in an axial end region of the fabric shaft, wherein the shaft end piece is non-positively connected to the fabric shaft, wherein a pressing part which is inserted into the fabric shaft is displaceable relative to the shaft end piece and / or to the fabric shaft in the axial direction and / or in the circumferential direction of the fabric shaft between a tensioned position and a release position and, in the tensioned position, exerts a radial pressing force on the shaft end piece and tensions it against an inner wall of the fabric shaft.

[0003] The roller shaft is a central component of the awning and must be both rotatable and held in a stable position so that the awning fabric can be unwound from the roller shaft and wound onto the roller shaft reliably and precisely.

[0004] There are known designs of fabric shaft holders in which the shaft end piece is inserted axially into the tubular fabric shaft with elastic deformation on one end face. The shaft end piece, which is oversized compared to the interior diameter of the fabric shaft, is pressed into the fabric shaft and thus, once inserted, is force-fitted to the fabric shaft. The shaft end piece must be sufficiently firmly seated in the fabric shaft to prevent it from working loose during its service life, particularly as a result of alternating loads. Furthermore, the inserted shaft end piece must not impair the technical functions of the awning. An improperly inserted or incorrectly seated shaft end piece can, for example, lead to increased noise when the awning fabric is extended and retracted.

[0005] It is common practice to axially secure the shaft end piece from outside the roller shaft with screws or rivets after it has been inserted. Optionally, the shaft end piece can be glued to the roller shaft once it has been inserted. These solutions are complex and therefore disadvantageous.

[0006] DE 10 2014 003 499 A1 shows a front-end bearing for a fabric shaft, which includes a clamping bushing that can be pressed against the inner wall of the hollow fabric shaft by mutually adjusting the clamping bushings. The clamping bushing has a conical contact surface and several expansion ribs distributed around its circumference. Additionally, a telescopic, spring-loaded support is provided to rotatably mount the fabric shaft. This design is structurally very complex and fragile.

[0007] The object of the invention is to provide a fabric shaft holder of the type mentioned, with which both a high holding force between the shaft end piece and the fabric shaft and simple assembly of the shaft end piece are ensured in a structurally simple manner.

[0008] This object is achieved according to the invention by a cloth shaft holder with the features of claim 1. It is also provided that a pressing part, which is preferably inserted axially into the cloth shaft, is displaceable relative to the shaft end piece and / or to the cloth shaft in the axial direction and / or in the circumferential direction of the cloth shaft between a clamping position and a release position and in the clamping position exerts a radial pressing force on the shaft end piece and clamps it against an inner wall of the cloth shaft.

[0009] In order to bring the pressing part into the tensioning position in a simple manner, it is provided according to the invention that the cloth shaft holder has at least one tensioning rod, preferably made of steel, which is guided through the pressing part and the shaft end piece and with which the pressing part can be displaced from the release position into the tensioning position.

[0010] Preferably, the tension rod extends in the axial longitudinal direction of the fabric shaft.

[0011] According to the invention, during pre-assembly, the pressing part, which is preferably made of plastic, can be loosely connected to the shaft end piece, which is also preferably made of plastic, so that both can also be pre-produced as a single component. For installation, this component assembly must be inserted axially, with the pressing part first, into the preferably tubular fabric shaft, with the shaft end piece located on one end of the fabric shaft in the axial direction of the fabric shaft, which is preferably made of steel. After insertion, the pressing part, in its release position, has a certain amount of play with respect to the shaft end piece and the fabric shaft.

[0012] After the pressing part and the shaft end piece have been inserted into the fabric shaft, preferably with elastic deformation of the shaft end piece, the pressing part is axially displaced from outside the fabric shaft into the tensioned position in a tensioning process, whereby it spreads the shaft end piece and tensions it radially against the inner wall of the fabric shaft. Any corrections during assembly can be made according to the invention by releasing the pressing part from the tensioned position towards the release position. Due to the pressing force, the shaft end piece can no longer detach itself from the fabric shaft. No further fastening means are required to hold the shaft end piece in the fabric shaft, and the pressing force is sufficiently great to reduce the noise generated when the awning fabric is extended and retracted.

[0013] According to the invention, the shaft end piece is tensioned by means of the clamping part only after both are inserted into the fabric shaft, whereby the shaft end piece does not have to be inserted into the fabric shaft with excessive force. Within the limits of component tolerances, the shaft end piece can only deform to the extent that it sits securely in the fabric shaft. Furthermore, the shaft end piece does not need to be screwed or glued to the fabric shaft. According to the invention, the tensioning process can be repeated or corrected regularly or as needed during maintenance. Disassembly of the fabric shaft holder is also possible.

[0014] The pressure part sits further into the interior of the fabric shaft than the shaft end piece, so that the pressure part is pulled towards the shaft end piece when the tension rod is partially pulled out of the fabric shaft. Preferably, the tension rod is prepared with the pressure part and the shaft end piece as a common component and inserted into the interior of the fabric shaft so that a section of the tension rod protrudes beyond the fabric shaft or protrudes from the shaft end piece in a tangible manner. The position of the pressure part can be adjusted manually from outside the fabric shaft using the tension rod when the component assembly consisting of the pressure part, the tension rod and the shaft end piece is inserted into the fabric shaft and the pressure part is still in the release position.

[0015] According to an advantageous aspect of the invention, the tension rod can be provided with an anti-twist device, which secures the tension rod to the contact pressure part in a rotationally fixed manner. When the tension rod is pulled out of the roller tube by means of a screw connection, the anti-twist device prevents the tension rod from twisting relative to the contact pressure part.

[0016] Optionally, it can be provided that the tensioning rod has a threaded section with which a tensioning element can be brought into engagement, wherein the tensioning rod can be displaced in the axial direction of the cloth shaft by means of the tensioning element.

[0017] The tensioning element can, for example, be a screw nut that engages with the threaded portion of the tension rod, which is designed as an external thread. This allows the tension rod to be pulled out of the fabric shaft with a sufficiently high pull-out force.

[0018] According to an advantageous embodiment of the invention, it can be provided that the tension rod has a bearing pin, preferably made of steel, in a bearing area arranged outside the fabric shaft, with which bearing pin the fabric shaft can be rotatably mounted in a bearing. Preferably, it can optionally be provided that the tension rod and the bearing pin are designed as a one-piece and in particular monolithic component. In this way, the tension rod also serves to rotatably mount the fabric shaft. Optionally, both the bearing pin and the tension rod can have a feedthrough that reaches into the interior of the fabric shaft. This allows optional devices to be introduced into the fabric shaft from outside the fabric shaft or the fabric shaft holder. These can be, for example, electrical cables for servo motors or other electronic components that may be useful for the function of the awning.

[0019] In order to reduce the probability of the tensioning element coming loose, according to an advantageous embodiment of the invention, the shaft end piece can have a locking element on a side facing away from the cloth shaft, with which the tensioning element can be locked in the tensioned position of the pressing part and in particular serves as an anti-twist device.

[0020] This can be a clamp, a pin, a small screw, or something similar, which, for example, acts as a clamping element to secure the nut against loosening from the external thread. Alternatively, the locking device can be a self-locking nut.

[0021] In order to apply the contact pressure evenly to the shaft end piece, it can advantageously be provided that the contact pressure part has at least partially a conical contact pressure surface in the axial direction of the cloth shaft, with which the shaft end piece can be spread radially.

[0022] When the clamping position is reached, the shaft end piece is spread apart by the conical contact surface and pressed against the inner wall of the fabric shaft until the required contact force is achieved and existing component tolerances are sufficiently corrected. The conical contact surface reduces excessive stress peaks that could act on the shaft end piece, making it easy to move the contact piece from the release position to the clamping position and vice versa.

[0023] Preferably, the shaft end piece has a pressing recess on a shaft side facing the interior of the fabric shaft, into which the pressing part can be inserted. Optionally, the pressing recess can also have a conical pressing surface that rests against the pressing surface of the pressing part in the clamped position.

[0024] The contact recess allows the contact surfaces of the contact part and the shaft end piece to lie against each other over a large area, so that good force transmission is achieved in order to reliably fix the shaft end piece in the cloth shaft.

[0025] According to an advantageous embodiment of the invention, the shaft end piece can be provided with a plurality of expanding ribs arranged at a distance along the circumference of the shaft, which are radially expanded in the clamping position by means of the contact pressure. The expanding ribs can, for example, be formed by recesses in the shaft end piece, protruding tongue-like from the shaft end piece in the axial direction of the cloth shaft.

[0026] According to a particularly advantageous embodiment of the invention, the shaft end piece can be provided with at least one guide element, with which the pressing part is mounted in the tensioned position in a rotationally fixed manner relative to the shaft end piece and which is intended to guide the pressing part during its axial displacement. In this way, wedging or jamming of the pressing part and the shaft end piece can be prevented. As a result, the tensioning rod can be mounted in a rotationally fixed manner relative to the roller tube via the anti-twist device with the pressing part, and the pressing part can be mounted in a rotationally fixed manner relative to the roller tube via the anti-twist device with the shaft end piece.

[0027] The invention is illustrated below by way of example using schematic representations. They show:

[0028] Fig. 1 is a side view of a cloth shaft holder according to the invention,

[0029] Fig. 2 shows the section AA according to Figure 1,

[0030] Fig. 3 the cloth shaft holder according to Figure 2 with the inserted shaft end piece and

[0031] Fig. 4 the shaft end piece with the pressing part in an axial view.

[0032] Figure 1 shows a cloth shaft holder 10 with a tubular cloth shaft 11, wherein in an axial end region 13 of the cloth shaft 11 a shaft end piece 12 is partially inserted into the cloth shaft 11 for its assembly.

[0033] Figure 2 shows that the essentially cylindrical shaft end piece 12 is partially inserted into an interior space 19 of the fabric shaft 11 during its assembly in a direction RI of an axial longitudinal axis L of the fabric shaft 11. The shaft end piece 12 has a conical pressing recess 20 with a conical pressing surface 15 on a shaft side 18 facing the interior space 19 of the fabric shaft 11. Furthermore, the shaft end piece 12 has an axial through-bore 30.

[0034] On the inner shaft side 18 of the shaft end piece 12, a pressing part 14 with a conical pressing surface 17 is arranged, which can be inserted into the pressing recess 20 of the shaft end piece 12, wherein the pressing part 14 is in a release position in Figure 2, in which it is spaced apart from the shaft end piece 12 and thus disengaged. The pressing part 14 also has an axial through-bore 31, which, with the through-bore 30 of the shaft end piece 12, forms a continuous through-bore that extends from the interior 19 of the cloth shaft 11 to an outer bearing area 24, which is located on an outer side of the shaft end piece 12 facing away from the cloth shaft 11.

[0035] In the release position, the pressing part 14 is loosely connected to the shaft end piece 12 via a tensioning rod 22 extending in the direction of the longitudinal axis L of the cloth shaft 11. The tensioning rod 22 extends through the through holes 30, 31 of the pressing part 14 and the shaft end piece 12 and protrudes from the shaft end piece 12 on the outer side of the shaft end piece 12 in the outer bearing area 24. The tensioning rod 22 engages with an anti-twist device 23 in a recess in a rear area of ​​the pressing part 14 and is thus secured against twisting relative to the pressing part 14.

[0036] Figure 3 shows a further sectional view of the fabric shaft holder 10, in which the pressing part 14 is in a clamped position, wherein the pressing part 14 is drawn into the pressing recess 20 by means of the tensioning rod 22 in the axial direction R2 of the longitudinal axis L. For this purpose, the tensioning rod 22 has an external thread 26 in the bearing area 24, which engages with a clamping nut 27. Upon actuation of the clamping nut 27, the tensioning rod 22 can be displaced along the axial longitudinal axis L of the fabric shaft 11 through the through-bore 30, 31, whereby the pressing part 14 is also displaced from the release position into the clamped position.

[0037] In the clamping position, the pressing part 14 rests with its pressing surface 17 on the pressing surface 15 of the pressing recess 20 of the shaft end piece 12 and presses against the shaft end piece 12 with a radial pressing force P. The pressing force P spreads the shaft end piece 12 radially apart in the area of ​​the pressing recess 20, whereby these areas are pressed against an inner wall 16 of the cloth shaft 11, so that the shaft end piece 12 is held releasably and force-fittingly in the cloth shaft 11.

[0038] In order to additionally secure the clamping nut 27 against loosening, a locking element 28 is inserted into the clamping nut 27.

[0039] The tensioning rod 22 has, in its outer end region in the bearing area 24, a section which is designed as a bearing pin 25. When the shaft end piece 12 is fastened in the fabric shaft 11 by the pressing part 14 being in the tensioned position, the shaft end piece 12 can be rotatably mounted together with the fabric shaft 11 by means of the bearing pin 25 in a bearing 32 shown only schematically. In this way, the tensioning rod 22 also serves to rotatably mount the fabric shaft 11. Figure 4 shows the shaft end piece 12 with the pressing part 14 in an axial view. The shaft end piece 12 has a plurality of expanding ribs 21 around its circumference, some of which are cut out of the shaft end piece 12 by means of recesses. The expansion ribs 21 extend in the direction of the axial longitudinal axis L away from the shaft end piece 12 and are radially expandable on the shaft side 18 of the shaft end piece 12.

[0040] If a pressing part 14 is inserted into the shaft end piece 12 in the direction of the axial longitudinal axis L on the shaft side 18, the pressing part 14 spreads the spreading ribs 21 radially away from the shaft end piece 12 with its pressing surface 17, which are thus pressed against the inner wall 16 of the cloth shaft 11, so that the shaft end piece 12 is fixed in the cloth shaft 11 by means of the pressing force exerted by the pressing part 14.

[0041] To improve the insertion of the pressing part 14 into the shaft end piece 12, the latter has a plurality of axially extending guide elements 29 extending around its circumference, which engage in corresponding recesses in the pressing part 14. If the pressing part 14 is transferred from the release position in the direction of the axial longitudinal axis L and the shaft end piece 12 into the clamping position, the guide elements 29 guide the displacement and secure the pressing part 14 against wedging or rotation relative to the shaft end piece 12.

Claims

Patent claims 1. A fabric shaft holder (10) for an awning, comprising a fabric shaft (11) on which an awning fabric can be wound, and comprising at least one shaft end piece (12) which is inserted into an axial end region (13) of the fabric shaft (11), wherein the shaft end piece (12) is non-positively connected to the fabric shaft (11), wherein a pressing part (14) which is inserted into the fabric shaft (11) is displaceable relative to the shaft end piece (12) and / or to the fabric shaft (11) in the axial direction and / or in the circumferential direction of the fabric shaft (11) between a tensioned position and a release position and, in the tensioned position, exerts a radial pressing force (P) on the shaft end piece (12) and tensions it against an inner wall (16) of the fabric shaft (11), characterized in that the fabric shaft holder (10) has at least one tensioning rod (22),which is guided through the pressing part (14) and the shaft end piece (12) and with which the pressing part (14) can be displaced from the release position into the clamping position., 2. Fabric shaft holder according to claim 1, characterized in that the tension rod (22) extends in the axial longitudinal direction (L) of the fabric shaft (11).

3. Fabric shaft holder (10) according to claim 1 or 2, characterized in that the tension rod (22) has a bearing pin (25) in a bearing area (24) arranged outside the fabric shaft (11), with which the fabric shaft (11) can be rotatably mounted in a bearing is .

4. Fabric shaft holder (10) according to claim 3, characterized in that the tension rod (22) and the bearing pin (25) are designed as a one-piece component.

5. Fabric shaft holder (10) according to one of claims 1 to 4, characterized in that the tensioning rod (22) has a threaded portion (26) with which a tensioning element (27) can be brought into engagement, wherein the tensioning rod (22) can be displaced in the axial direction of the fabric shaft (11) by means of the tensioning element (27).

6. Fabric shaft holder (10) according to claim 5, characterized in that the shaft end piece (12) has a locking element (28) on a side facing away from the fabric shaft (11), with which the tensioning element (27) can be locked in the tensioning position of the pressing part (14).

7. Fabric shaft holder (10) according to one of claims 1 to 6, characterized in that the tensioning rod (22) has an anti-twist device (23) with which the tensioning rod (22) is mounted in a rotationally fixed manner relative to the pressing part (14).

8. Fabric shaft holder (10) according to one of claims 1 to 7, characterized in that the pressing part (14) in the axial direction of the fabric shaft (11) at least partially has a conical pressing surface (17) with which the shaft end piece (12) can be spread radially.

9. Fabric shaft holder (10) according to one of claims 1 to 8, characterized in that the shaft end piece (12) has, on a shaft side (18) facing an interior space (19) of the fabric shaft (11), a pressing recess (20) into which the pressing part (14) can be inserted.

10. Fabric shaft holder (10) according to one of the preceding claims, characterized in that the shaft end piece (12) has a plurality of spreading ribs (21) arranged spaced apart over a shaft circumference, which are radially spread in the clamping position by means of the contact pressure (P).

11. Fabric shaft holder (10) according to one of the preceding claims, characterized in that the shaft end piece (12) has at least one guide element (29) with which the pressing part (14) is mounted in the clamping position in a rotationally fixed manner to the shaft end piece (12) and which is provided to guide the pressing part (14) during its axial displacement.

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