DK2764189T3

DK2764189T3 - Spring take-up cone for a torsion spring with a torque-transmitting leg bent inward or outward

Info

Publication number: DK2764189T3
Application number: DK12781051.3T
Authority: DK
Inventors: Jochen Birwe
Original assignee: Brand Kg
Priority date: 2011-10-06
Filing date: 2012-10-08
Publication date: 2018-04-09
Also published as: EP2764189B1; PL2764189T3; EP2764189A1; DE202011051560U1; WO2013050614A1

Description

TECHNICAL FIELD OF THE INVENTION

The invention relates to a spring mounting cone comprising the features of the preamble of independent claim 1, a use of such a spring mounting cone as well as to an arrangement comprising such a spring mounting cone.

Particularly, such a spring mounting cone is provided for connecting one end of a sectional door spring serving for weight compensation in an industrial or garage sectional door. This means that the spring mounting cone is used as a so-called fixed cone for fixing a spring end to a rotationally fixed support or as a tension cone for pre-tensioning and fixing the other spring end with regard to and to a shaft which is to be torsional-elastically supported by the torsion spring.

PRIOR ART A spring mounting cone comprising the features of the preamble of independent claim 1 is known from US 2001/0039761 A1. This spring mounting cone is intended for being pressed into a spring end of a torsion spring whose spring wire ends with a torque-transmitting leg bent radially inward. For this purpose, the torque-transmitting leg is at first inserted into a swell of an opening in a circumferential surface of the spring mounting cone, wherein the main axis of the spring mounting cone runs at an angle with regard to the spring axis of the torsion spring. Afterwards, the main axis is aligned coaxial with regard to the spring axis, and the spring cone is pressed with its circumferential surface into the spring end until the torsion spring abuts against a projection adjacent the circumferential surface, which points radially outward and runs around the entire circumferential surface. Here, two flanks offset with regard to the opening in circumferential direction enter between the spring winding of the torsion spring. This mounting of the known spring mounting cone requires force and is only possible with a comparatively small axial extension of the circumferential surface. When this known spring mounting cone is made as a fixed cone, two diametrically opposing, projections pointing radially outward follow to the running around projection in axial direction, fixation holes for mounting the fixed cone to a rotationally fixed support being provided in the projections pointing radially outward.

Even in another known fixed cone comprising the features of the preamble of independent claim 1, two diametrically opposing protrusions pointing radially outward are provided axially adjacent to a circumferential surface, fixation holes for mounting the fixed cone to a rotationally fixed support being provided in the two protrusions pointing radially outward. These fixation holes have no defined position with regard to the circumferential surface. For fixing the spring end of a torsion spring on this known fixed cone, it is intended to heat up the end of its spring wire and to then press it into the opening in the circumferential surface to form a torque-transmitting leg engaging into this opening. This procedure is also comparatively laborious but is applied to a large extent.

In a spring mounting known from DE 43 41 309 C1, two diametrically opposing, radially running fixation holes with internal threads are provided adjacent to the circumferential surface which is to be inserted into the spring end of a torsion spring to be fixed. Fixation screws for two holding elements engage into these fixation holes. The one holding element grips from the outside between the two first windings of the torsion spring to support it axially. The second holding element comprises an opening which is parallel to a through hole for the fixation screw, and a torsion transmitting leg bent radially outward of the spring wire of the torsion spring is guided through the opening to support the torsion spring in circumferential direction. A torque-transmitting leg pointing outward may be formed without problem already during production of the torsion spring, and there is no need to form it with high efforts at large wire sizes afterwards a spring mounting cone has already been inserted into the spring end. No flanks are provided on the circumferential surface of this known spring mounting cone. Thus, the circumferential surface may easily be axially pushed into the spring end. However, two holding elements have then to be mounted with one fixation screw each. Further, due to its multi-part construction, the known spring mounting cone is expensive in production and stockkeeping. A further spring mounting cone for a spring end of a spiral-shaped torsion spring comprising a torque-transmitting leg bent radially outward is known from EP 1 331 415 B1. Here, a flank-free area of the circumferential surface which serves for supporting the torsion spring at its inner circumference is overlapped by a corbelling retaining element which has an opening for receiving the torque-transmitting leg. This opening is delimited in at least one direction around the circumferential surface by a stopper surface for the torque-transmitting leg. The retaining element with the stopper surface is an area of a single shaped part which also forms the circumferential surface of the spring mounting cone. If the opening is only delimited in only one direction around the circumferential surface by a stopping surface of this shaped part, a locking element is attachable to the retaining element such that it closes the opening in the direction opposing the stopping surface. This locking element is a safety pin which engages into a fitting hole in the retaining element. In mounting this known spring mounting cone, at least with greater wire sizes and correspondingly higher stiffnesses of the torsion spring, it proves to be laborious to insert the torque-transmitting leg into the opening in the retaining element as the torque-transmitting leg collides with those parts of the retaining element corbelling beyond the opening when a flank which protrudes from the circumferential surface diametrically opposite to the retaining element is simply axially screwed between the spring windings of the torsion spring. Further, this known spring mounting cone, due to the retaining element corbelling above the circumferential surface, is comparatively expensive in its manufacture although it is one part except of the locking element in form of a simple safety pin. A spring mount for a torsion spring which is assigned to a shaft of a door, particularly a sectional door or the like, is known from DE 20 2009 001 535 U1. Here, a straight torque-transmitting leg is fixed by means of force and shape fit at or to the spring mount. This straightly made torque-transmitting leg runs tangentially with regard to the adjacent final winding of the torsion spring. It is enclosed by a clamping element and thus fixed to a flange of the spring mount. For this purpose, a hole is provided in the flange which runs parallel to the spring axis of the torsion spring at a radial distance to a mounting stub of the spring mount which supports the torsion spring at its inner circumference. The mounting stub is provided with a flank engaging between the two last spring windings in an area shortly in front of that point at which the spring end departs from the remainder of the torsion spring. A multi-part spring mount which, adjacent to a mounting stub, has a flange comprising bores running at a radial distance to the mounting stub is known from WO 90/15216. The bores are, on the one hand, provided for connecting the flange to a counter piece which is rotationally fixed on a shaft to be supported in a desired rotational position. On the other hand, the screws used here secure an axial holding element for a final winding of the torsion spring on the mounting stub or serve as a stop in circumferential direction for a torque-transmitting leg radially protruding beyond the adjacent spring windings.

PROBLEM OF THE INVENTION

It is the problem of the invention to improve a spring mounting cone comprising the features of the preamble of independent claim 1, at an as low expense as possible, to be able to also use it with torsion springs which have a torque-transmitting leg bent radially outward at their spring end.

SOLUTION

The problem of the invention is solved by a spring mounting cone comprising the features of independent claim 1, a use of such a spring mounting cone according to claim 13 as well as an arrangement including such a spring mounting cone according to claim 14. Preferred embodiments of the spring mounting cone according to the invention and of the arrangement according to the invention are defined in the dependent claims.

DESCRIPTION OF THE INVENTION

In a spring mounting cone according to the invention, a stop anchoring hole is provided in a projection, that points radially outward and that is axially adjacent to the circumferential surface, at a radial distance to the adjacent circumferential surface, the stop anchoring hole being designed for anchoring a stop for a torque-transmitting leg of the torsion spring bent outward. This stop anchoring hole is always provided, e.g. also if a spring end of a torsion spring having a torque-transmitting leg bent inward is fixed on the spring mounting cone according to the invention. The additional efforts unnecessarily spent in this case in manufacturing the new spring mounting cone is overcompensated by the simplified stockkeeping when using the new spring mounting cone both for torsion springs with torque-transmitting legs bent inward at their spring ends and for torsion springs with torque-transmitting legs bent outward at their spring ends. In opposite direction this also applies to the additional effort spent for the opening in the circumferential surface if the new spring mounting cone is used together with the stop for fixing a spring end of a torsion spring having a torque-transmitting leg bent outward.

In the spring mounting cone according to the invention, the stop anchoring hole in the projection preferably has a radial minimum distance to the adjacent circumferential surface which is as high as a maximum wire size of the torsion spring to be fixed. A radial maximum distance of the stop anchoring hole to the adjacent circumferential surface is typically twice the maximum wire size of the torsion spring. The maximum wire size of the torsion spring determines the minimum height of the stop for a torque-transmitting leg bent outward of the torsion spring above the circumferential surface and thus also the suitable minimum height of the stop anchoring hole for anchoring the stop. At the same time, the stop anchoring hole should not be too high above the circumferential surface as this would result in unfavorable relationships of levers in supporting the torque-transmitting leg in circumferential direction and require a projection projecting further in radial direction and thus a higher amount of material for the spring mounting cone according to the invention.

Preferably, the stop anchoring hole in the projection for anchoring the stop is oriented parallel to the main axis of the spring mounting cone. Thus, independently on the pitch direction of the torsion spring, optimum conditions are provided for supporting the stop in circumferential direction.

Further, it is preferred that the stop anchoring hole is a through hole to use the full wall thickness of the projection for supporting the stop. In any case, the stop anchoring hole may already be formed in manufacturing the spring mounting cone by, for example, casting. Alternatively it may be drilled-in afterwards.

Further, it is preferred that the stop anchoring hole is provided with an internal thread. Then, a cylinder screw may be provided for being screwed in the stop anchoring hole, its head serving as the stop. This means that, in the new spring mounting cone, the stop for the torque-transmitting leg bent outward may be provided by a simple cylinder screw if needed. With regard to stockkeeping, this is extraordinarily cost-efficient, particularly as such a cylinder screw is a standard part. Further, installing the stop in form of the head of the cylinder screw only requires a minimum effort. Particularly, the stop is not yet in the way of the torque-transmitting leg pointing outward when inserting the circumferential surface of the spring mounting cone in a screwing way but only installed later by screwing-in the cylinder screw.

At least, if the stop anchoring hole and thus a stop for the torque-transmitting leg anchored therein is provided in circumferential direction in the same circumferential area as the flank protruding from the circumferential surface and engaging between spring windings of the torsion spring, there is no danger that the torque-transmitting leg sidesteps the stop in axial direction away from the projection.

Preferably, the new spring mounting cone also has a further flank in a circumferential area diametrically opposing the at least one flank, which also protrudes from the circumferential surface between spring windings of the respective torsion spring or is screwed between the spring windings in mounting the spring mounting cone.

In the new spring mounting cone, the stop anchoring hole or the projection in which the stop anchoring hole is provided may be provided in the same circumferential area as the opening in the circumferential surface. In this case, the stop is above the opening. This has no negative effect on its function. However, the additional material of the projection may be used for reinforcing the spring mounting cone which is locally weakened by the opening in the circumferential surface. In any case, in the new spring mounting cone, the projection may just be provided locally so that the projection with the stop anchoring hole may, for example, just rise radially above the adjacent circumferential surface by more than half of the maximum wire size of the torsion spring over a circumferential area of less than 90°. In other words, in the new spring mounting cone, the projection is normally not intended as an axial stop for the spring end.

To avoid slipping or sliding of the spring windings off the circumferential area of the spring mounting cone according to the invention, a plurality of web-shaped axial protrusions may protrude from the conical circumferential surface. The protrusions may be a few millimeters in height and taper off towards the inner end of the circumferential surface. They make the circumferential surface non-circular and thus provide support for the spring windings which are narrowed down with torsion load on the spring. Preferably, there are four protrusions uniformly distributed over the circumferential surface.

In the spring mounting cone according to the invention, further holes may be provided for rotating the spring mounting cone with the spring end of the torsion spring with regard to a rotary mounted shaft extending through the torsion spring and for fixing the spring mounting cone with the spring end of the torsion spring to the shaft. This means that the spring mounting cone may be directly made as a tension cone. Alternatively, further holes in the spring mounting cone may be provided for fixing the spring mounting cone with the spring end of the torsion spring to a rotationally fixed support. This corresponds to making the spring mounting cone according to the invention as a fixed cone.

Preferred enhanced embodiments of the invention appear from the claims, the description and the drawings. The advantages of features and of combinations of several features mentioned in the description are exemplary only and may alternatively or cumulatively come into effect without these advantages having to be mandatorily achieved by all embodiment of the invention.

With regard to their number, the features mentioned in the claims and the description are to be understood in that exactly this number or a higher number than the mentioned number is existing without the need of explicitly using the term "at least". If, for example, one element is mentioned, this is to be understood in that exactly one element, two elements or more elements are existing. These features may be supplemented by further features, or may be the only features of which the respective product consists.

The reference numerals included in the claims are no limitation of the scope of the subject-matter protected by the claims. They only serve for making the claims understandable easily.

SHORT DESCRIPTION OF THE DRAWINGS

In the following, the invention is further explained and described by means of preferred embodiment examples depicted in the figures.

Fig. 1 is a side view of a spring mounting cone according to the invention made as a tension cone in which some hidden lines are depicted as dashed line.

Fig. 2 is an axial section through the spring mounting cone according to Fig. 1.

Fig. 3 is a perspective front view of the spring mounting cone according to Figs. 1 and 2.

Fig. 4 is a perspective back view of the spring mounting cone according to Figs. 1 and 2.

Fig. 5 is a perspective back view of a spring mounting cone according to the invention made as a fixed cone.

Fig. 6 is a perspective explosion view of a further spring cone according to the invention made as a tension cone and of a spring end of a torsion spring having a torque-transmitting leg bent inward.

Fig. 7 shows the spring end according to Fig. 6 fixed to the tension cone according to

Fig. 6 in a perspective view.

Fig. 8 is a perspective explosion view of the tension cone according to Figs. 6 and 7, of a spring end of a torsion spring having a torque-transmitting leg bent outward and of a cylinder screw as a stop for this torque-transmitting leg.

Fig. 9 is a perspective view of the assembled parts according to Fig. 8.

DESCRIPTION OF THE DRAWINGS

The spring mounting cone 1 depicted in Figs. 1 to 4 is provided for a spring end of a spiralshaped torsion spring which is not depicted here as such. The goal is to fix the spring end to the spring mounting cone 1 in a direction of a main axis 2 of the spring mounting cone 1 in a rotationally fixed way to transmit torques between the spring and a structure to which the spring mounting cone 1 is fixed. This structure which is not depicted in the drawings may be a rotationally fixed support or a rotary-mounted shaft rotational-elastically supported by means of the torsion spring.

The spring mounting cone 1 depicted in Figs. 1 to 4 is intended for the latter purpose and is thus also designated as a tension cone 3. Here, a cylinder bore coaxial with regard to the main axis 2 is provided for the shaft, threaded holes 6 for fixing screws 20 being provided in a wall 5 of the cylinder bushing 4. Further, cylinder-shaped blind holes 7 which run radially with regard to the main axis 2 are provided for inserting tensioning tools to rotate the spring mounting cone 1 with a spring end fixed thereto with regard to the respective shaft. This serves for the purpose of applying a pre-tensioning force prior to fixing the spring mounting cone 1 to the shaft.

On the other hand, the spring mounting cone 1 depicted in Fig. 5 is a fixed cone 1 and thus has axial threaded holes 22 for fixing screws (not depicted here) in a front face 23 at its far end.

With regard to fixing the spring end of the torsion spring to the spring mounting cone 1, the tension cone 3 according to Figs. 1 to 4 and the fixed cone 21 according to Fig. 5 are shaped equally. Thus, each comprises a circumferential surface 8 which is inserted into the spring end and supports the spring end at the inner circumference of the torsion spring. Due to the slightly conical shape of the circumferential surface 8 which, however, does not need to run over the entire arc of a circle around the main axis 2, the spring mounting cone 1 has its name. Flanks 9 and 10 protrude from the circumferential surface 8, which, in inserting the circumferential surface 8 into the spring end, are screwed between the spring windings of the torsion spring. The flanks 9 and 10 are diametrically opposite to each other with regard to the main axis 2, and the flank 9 comprises an interruption. This means the flank 9 consists of two partial flanks at a distance in circumferential direction. Adjacent to the flank 9, an opening 11 is provided in the circumferential surface 8 which is delimited in circumferential direction by a torque-transmitting rim 12. The spring wire at the spring end of the torsion spring may be bent into the opening 11 to form a torque-transmitting leg which abuts against the torque-transmitting rim. The spring mounting cone 1 is, however, also suitable for use with torsion springs which have a torque-transmitting leg bent outward at their spring end. For such a torque-transmitting leg, a cylinder screw 13 is screwed into an internal thread 14 which is provided above the circumferential surface 8 in a stop anchoring hole 15 in a projection 16 pointing radially outward adjacent to the circumferential surface 8, after arranging the spring end on the spring mounting cone 1. The head 17 of the cylinder screw 13 then forms a stop for the torque-transmitting leg, which is anchored in the stop anchoring hole 15 with the shaft 18 of the cylinder screw 13 via the internal thread 14. This stop only gets in the way of the torque-transmitting leg bent outward when the spring mounting cone 1 with the flanks 9 and 10 has already been screwed into the spring end. That the torque-transmitting leg gets out of the way of the stop 19 in form of the head 17 of the screw 13 is avoided by the adjacent flank 9. The projection 16 only projects locally, i.e. over a limited area of the circumference around the main axis 2 above the circumferential surface 8. In that the stop anchoring hole 15 running through the projection 16 in parallel to the main axis 2 is arranged above the opening 11, the torque-transmitting leg of the torsion spring is always supported in the same circumferential area around the main axis 2 regardless of the torque-transmitting leg being bent inward or outward. To avoid an axially sliding of the spring windings narrowing down under torsion load off the circumferential surface 8, besides the flanks 9 and 10 for the farthest spring windings running in circumferential direction, four axially running web- shaped protrusions 23 of the circumferential surface 8 are provided at offsets of 90° each. With regard to the opening 11, the neighboring protrusions 23 are offset by 45° around the main axis 2. These protrusions 23 make the circumferential surface non-circular so that the spring wire of the narrowing down spring windings despite to the conical form of the circumferential surface which is not removed by the protrusions 23, gets hold on the circumferential surface.

The Figs. 6 and 7, once as an explosion drawing and once in an assembled state, show a further spring mounting cone 1 made as a tension cone 3 and a spring end 25 of a torsion spring 24. The spring end 25 is provided with a torque-transmitting leg 26 bent radially inward. This torque-transmitting leg 26 engages into the opening 11. Here, the final winding 27 is held by the flanks 9 and 10 in axial direction on the circumferential surface 8 so that the torque-transmitting leg 26 in fact only serves for transmitting the torque from the torsion spring 24 via the torque-transmitting rim onto the spring mounting cone 1. The embodiment of the spring mounting cone 1 made as a tension cone 3 differs from that one of Figs. 1 to 4 by another design of the cylinder bushing 4, here with notches 28 for receiving corresponding webs of a shaft which is elastically supported by the torsion spring 24.

Figs. 8 and 9 show the same spring mounting cone 1 made as a tension cone 3 as Figs. 6 and 7 but here in combination with a spring end 25 of a torsion spring 24 whose torque-transmitting leg 26 is bent radially outward. In this case, the cylinder screw 13 with its head 17 serves as a stop 19 for the torque-transmitting leg 26. The final winding 27 of the torsion spring 24 is once again held on the circumferential surface 8 in axial direction by the flanks 9 and 10 so that also here the torque-transmitting leg serves for transmitting torque between the torsion spring 24 and the spring mounting cone 1 only.

LIST OF REFERENCE NUMERALS 1 spring mounting cone 2 main axis 3 tension cone 4 cylinder bushing 5 wall 6 threaded hole 7 blind hole 8 circumferential surface 9 flank 10 flank 11 opening 12 torque-transmitting rim 13 cylinder screw 14 internal thread 15 stop anchoring hole 16 projection 17 head 18 shaft 19 stop 20 fixation screw 21 fixed cone 22 threaded hole 23 protrusion 24 torsion spring 25 spring end 26 torque-transmitting leg 27 spring winding 28 notch

Claims

A spring take-up cone (1) for a spring end (25) of a helical torsion spring (24) with a bent torque-transmitting leg, wherein the spring take-up cone (1) comprises: - a circumferential surface (8) for radially supporting the torsion spring on its inner circumference, - at least a flank (9, 10) projecting from the circumferential surface (8) and extending in the circumferential direction for engagement between spring windings (27) of the torsion spring (24), - a recess (11) circumferentially limited by a torque transmitting edge (12), in the circumferential surface (8) for receiving and supporting a torque transmitting leg (26) bent inwardly by the torsion spring (24) and - an axial projection (16) adjacent to the circumferential surface (8) radially outward, characterized in that the projection (16) at a radial distance from the adjacent circumferential surface (8) comprises an abutment anchoring hole (15) formed for anchoring an abutment (19) in the circumferential direction for a rotation torque-transmitting legs (26) bent outwardly of the torsion spring (24).

A spring retaining cone (1) according to claim 1, characterized in that the abutment anchor hole (15) is disposed at a minimum radial distance of the maximum wire diameter and at a radial maximum distance twice the maximum wire diameter of the torsion spring (24) relative to the adjacent one. circumferential surface (8).

The spring uptake cone (1) according to claim 1 or 2, characterized in that the stop anchor hole (15) is oriented parallel to a main axis (2) of the spring uptake cone (1).

Spring take-up cone (1) according to one of claims 1 to 3, characterized in that the stop anchoring hole (15) is a through-hole.

Spring mounting cone (1) according to one of claims 1 to 4, characterized in that the stop anchor hole (15) is provided with an internal thread (14), where a cylinder screw (13) is provided for screwing in the stop anchor hole (15) with its head (17) as an estimate (19).

The spring uptake cone (1) according to one of claims 1 to 5, characterized in that the stop anchoring hole (15) is provided in the same circumferential region as the at least one flank (9).

Spring receiving cone (1) according to one of claims 1 to 6, characterized in that a further edge (10) in a circumferential region projects diametrically opposite the at least one edge (9) from the peripheral surface (8).

A spring retaining cone (1) according to one of claims 1 to 7, characterized in that the stop anchor hole (15) is provided in the same circumferential region as the recess (11).

A spring mounting cone (1) according to one of claims 1 to 8, characterized in that the projection (16) with the impact anchoring hole (15) only extends over the adjacent circumferential surface (8) over a circumferential area of less than 90 ° by more than half. maximum thread diameter of the torsion spring.

Spring take-up cone (1) according to one of claims 1 to 9, characterized in that a plurality of bridged axial elevations (23) protrude from the conical circumferential surface (8).

The spring uptake cone (1) according to one of claims 1 to 10, characterized in that four elevations (23) displaced relative to one another by 90 ° in the circumferential direction project from the conical circumferential surface (8).

A spring take-up cone (1) according to one of claims 1 to 11, characterized in that additional holes (6, 7, 22) are provided in the spring take-up cone (1) for rotating the spring take-up cone (1) with the spring end of the torsion spring relative to a spring. pivotally mounted shaft extending through the torsion spring and for securing the spring take-up cone (1) with the spring end of the torsion spring (24) on the shaft or for securing the spring take-up cone (1) with the spring end of the torsion spring on a pivot-mounted model.

Use of a spring take-up cone (1) according to one of claims 1 to 12, characterized in that the circumferential surface (8) of the spring take-up cone (1) is inserted screwed into a spring end (25) of a torsion spring (24) with a torque transmitting leg (26). ) which is bent outwardly and that an abutment (19) for the torque transmitting leg (26) is then anchored in the abutment anchorage hole (15).

Device with a spring receiving cone (1) according to one of claims 1 to 12 and a torsion spring (24) with a torque transmitting leg (26) bent outwardly on a spring end (25), the circumferential surface (8) of the spring receiving cone ( 1) is inserted into the spring end (25) of the torsion spring (24), characterized in that an abutment (19) for the torque transmitting leg (26) is anchored in the abutment anchoring hole (15) of the spring take-up cone (1).

Device according to claim 14, characterized in that the flanks (9 and 10) hold a last winding (27) of the torsion spring (24) in axial direction on the circumferential surface (8).