EP0729542B1 - Tensioning device for the weight-equilibration torsion-spring unit of a door leaf - Google Patents

Abstract

The invention concerns a tensioning device (7) for at least one torsion spring (2) fitted round a shaft (1) which is operatively linked to a door leaf with which it moves, executing a rotary motion as it moves. One end of the torsion spring (2) is fixed to a tensioning ring which can be rotated about the shaft (1) and, following tensioning of the spring by rotation of the tensioning ring (5), can be locked to the shaft (1) so that it can no longer rotate. The spring (2) can be tensioned manually, without the need for any great force and without danger for the fitter, by virtue of the fact that the tensioning ring (5) is fitted coaxially to the power-output element (9) of a high-ratio gear (8) whose power-input element (10) is operatively connected to the power-output element (9), and hence to the spring, by mounting the power-input element (10) in a housing (11) fitted to the shaft (1) or to the tensioning ring (5), the power-input element (10) being designed so that it can be connected to an ordinary hand-held rotary power tool.

Description

The invention relates to a tensioning device for at least one torsion spring device, which is assigned to a wave, the latter with a door leaf - preferably a one- or multi-part gate that can be moved overhead, for example Ceiling sectional gates - connected in terms of gears, and its movement process implemented in a rotational movement, the Torsion spring device an end, preferably the associated Shaft bearing facing, held stationary against rotation and other end is connected to a chuck that around the Rotatable shaft and - after tensioning the spring by turning the chuck - which chuck with the coaxial can be locked against rotation Worm gear of a worm gear, which is preferably self-locking is provided, the worm for a gear connection to the worm wheel in a for the purpose of torsion spring tension on the shaft or the Chuck mounted on the chuck housing and attached to a conventional, motorized - especially electric motor-driven tools with rotary Drive, such as a hand drill, can be connected, which clamping housing for the Is placed circumferentially on the shaft at least in two parts, with one in the mounting state extending transversely to the longitudinal direction of the shaft Boom to derive the torsion spring device to be tensioned in the clamping housing initiated reaction torque in a fixed support, in particular the inner-walled lintel area of those to be closed with the door leaf Gate opening, is provided and in the state placed on the shaft and gear engagement against axial displacement movements relative to the chuck the worm wheel is securely guided.

Tensioning torsion springs for balancing the weight in particular Sectional gates are usually made by hand, for example by the usual one Formation of a following the intake cone of the opposite the torsion spring device receiving shaft movable clamping part or Chuck with four radial holes evenly distributed over the circumference, in which you can use tension levers. This work must be carried out on site with pre-assembled Spring wave are made, so usually in proportion high altitude. The forces to be applied are towards the end of the clamping process extraordinarily high, so that taking into account the location of the fitter appearing on a ladder and there are considerable accidents Forces must be applied. With the kind of Clamping by inserting the clamping lever into the radial bores of the chuck As a rule, two levers are used, which are operated with both hands so that you don't need the chuck for every smaller clamping stroke must tighten the locking screws that fix the shaft. By means of a Another solution that works with a hand-operated ratchet is the situation especially with regard to the manual operating force to be applied significantly different.

A tensioning device with the features mentioned above is already from the US 3,921,761 known. Instead of a device with which the chuck in more or less difficult handling in any case with regard to the to be applied Clamping force is only operated by hand, this allows known Formation of the clamping device with a worm gear, the output side Coupling to the chuck of a torsion spring to be tensioned and its drive-side connection option to a motor-driven Tools such as hand drills are only used to operate this tool Required actuation with only one hand and without the torque for tensioning the spring only by manual actuation have to. In particular, it is not necessary with both hands at the same time or alternately overlapping to attack clamping levers and / or one Kind of ratchet to use with one-way clutch, which is at least the application of the total torque required for tensioning the torsion spring by hand. Both conventional spring tensioning processes are taken into account the assembly conditions dangerous and exhausting, what by the Use of the tensioning device according to the invention and its actuation by a motor-operated hand tools of conventional design is avoided.

This known object is based on the idea that Tensioning device for tensioning the spring as a whole worm gear to train comprehensive unit, which in the event of tension on the Shaft placed and on the conventionally designed chuck - insertion openings for manual clamping levers - to be connected. There are certainly spatial ones Situations and effort considerations that make this procedure cumbersome and / or not always appear to be manageable without difficulty to let.

The invention has for its object a tensioning device of the beginning to provide the type mentioned, the tensioning of the torsion spring device for the fitter less dangerous and with less manual operation allowed.

This object is achieved in that the teeth of the Worm gear in the shape of a hollow with an approximately in the of the chuck End region facing away from the shaft axis and an approximately radial outwardly ending outlet area is formed, the latter on a radial striving ring bead is formed, on the axially opposite Shoulder, in particular groove, attacks the clamping housing secured against axial relative movements.

So it is due to the special shape of the worm wheel, its permanent Assignment to the chuck, the arrangement of only the worm of the Worm gear in the clamping housing and a clamp between them and - ultimately - the chuck for the purpose of connection and the secured Intervention between worm and worm wheel facilitated Handling, namely space-saving and with regard to the clamping housing to be attached easier than was previously the case.

In a particularly preferred embodiment, the worm gear is self-locking trained, i.e. when decoupling the hand tools from the gear the tensioned spring does not restrict the gearbox as far as the drive member move. This also simplifies handling for the clamping process or an interruption of the tensioning process, intended or by Slipping of the hand tools does not lead to a return of the spring tension. The transmission gear consists of one Worm gear with a to the chuck or the taper of the for tensioning the spring end to be rotated relative to the shaft connected worm wheel and a worm engaging in it as Drive member, which is held rotatably in a clamping housing for the clamping process can be connected to the hand tools at one of its two shaft ends. The clamping housing is part of the clamping device, which is only for the Clamping process can be placed on the shaft or the chuck such that the geared connection between the drive member and driven member and is ensured. For this purpose, the clamping housing is at least circumferentially formed in two parts, preferably in the form of one in the case of touchdown on the shaft this U-shaped enclosing main part, through the leg ends Bores are guided, which in the mounting state a locking pin record that the shaft introduced into the U-shaped main part in this Position is locked in such a way that the gear connection between the Clamping housing and the chuck, in particular between the screw as the drive member and the worm wheel as an output member is ensured. After removal of the locking pin passing through the coaxial bores can be the Main part of the clamping housing and thus this in its entirety with separation Remove the gear connection from the shaft or chuck.

For recording the reaction torque on the shaft or chuck attached clamping housing is due to the clamping force contained in the spring the clamping housing against twisting movements in relation to the shaft supported in a stationary manner, so that the reaction moment is not due to the drive member motor tools to be connected are included got to. Accordingly, the clamping housing with a transversely in the mounting state Longitudinal direction of the shaft extending boom provided, in particular with its end facing away from the clamping housing at the lintel area with the door leaf attacks the door opening to be closed, in particular by means of a Rolling body arranged in this cantilever end region, preferably spherical, because the torsion spring shaft in the course of tensioning in the axial direction the shaft undergoes an extension of the clamping housing and thus the boom by moving the shaft in the longitudinal direction. The boom is preferably variable in length to adapt to spatially different conditions, in particular simply by means of supports positioned differently on the clamping housing.

In a particularly preferred embodiment, the worm wheel of the transmission gear is flanged to the chuck. In a particularly preferred embodiment, too Worm wheel formed in one piece with the chuck. This latter version is primarily for original equipment of a wave of the in question Kind suitable. The chuck and the output member then preferably form a casting. In the event that an existing chuck subsequently in the invention Way to be provided with a tensioning device, this can be done by utilizing the radial holes provided in the chuck for the The use of tensioning levers is particularly preferred due to a two-part, i.e. in realize axial longitudinal median plane, forming a connecting body, the one with the protruding perpendicular to the central plane, in the assembled state in pins engaging diametrically opposite radial bores is provided and after joining the two half-shells the output member of the gear, in particular the worm wheel. With multi-part training of the clamping housing or connection body must be due to the uniform Ensure the circumferential course of the worm wheel be worn that its configuration also taking into account the Rotation relative to the shaft is ensured, for example, what one achieved by distance-securing adapter sleeves, which are in aligned holes in the intervene several, in particular two, parts to be connected and by Bolts of corresponding screw connections are penetrated.

The tensioning housing, together with the, in particular, approximately quarter-circle-shaped, hollow-throat gear formation of the worm wheel on the shaft applied state a the gear engagement between worm and worm wheel securing lock against axial relative movements, in particular by a provided on the clamping housing projection on a shoulder or in a Groove that engages in the quarter-circle toothing of the worm wheel axially facing area of the worm wheel or chuck unit and worm wheel or the connecting body.

The at least one torsion spring device mentioned here, which is used for weight compensation a door leaf with a vertical component is used, is in conventionally by a correspondingly encompassing the shaft with its coils strong torsion spring formed. There are of these torsion springs on a wave two or more. These individual torsion springs can also by bundles of parallel, weaker torsion springs be formed, which are coupled via a planetary gear. Depending on Installation conditions and design can actuate the drive element, in particular a worm with shaft sections provided on both end faces, be desirable from both axial directions of the drive member, which is why a corresponding accessibility on both sides for the connection of the hand tools is preferred.

Figur 1

eine - hinsichtlich der Torsionsfeder geschnittene - Seitenansicht auf eine Spanneinrichtung einer ersten Ausführung mit dem zugehörigen Wellenabschnitt;

Figur 2

eine zur Darstellung gemäß Figur 1 um 90° gedrehte Seitenansicht mit ungeschnittenem Federanschlußende;

Figur 3

eine axiale Ansicht lediglich auf das Spanngehäuse bei geschnittener Welle nach der Linie III-III in Figur 1;

Figur 4

eine Schnittansicht nach der Linie IV-IV in Figur 1;

Figur 5

eine Seitenansicht ähnlich derjenigen gemäß Figur 1 - jedoch ohne Antriebsglied - nach einer zweiten Ausführung;

Figur 6

eine wie Figur 2 um 90° gedrehte Seitenansicht der zweiten Ausführung;

Figur 7

eine in Richtung von der Torsionsfeder abgewandte Seitenansicht des Anschlußkörpers nach der zweiten Ausführung mit einem Teilschnitt im Bereich einer der Verschraubungen.

The aforementioned and further embodiments of the invention result from the subclaims, in particular with reference to the exemplary embodiments shown in the drawing, the following description of which explains the invention in more detail. Show it:

Figure 1

a - cut with respect to the torsion spring - side view of a tensioning device of a first embodiment with the associated shaft section;

Figure 2

a 90 ° rotated side view for illustration according to Figure 1 with uncut spring connection end;

Figure 3

an axial view only of the clamping housing with a cut shaft along the line III-III in Figure 1;

Figure 4

a sectional view taken along the line IV-IV in Figure 1;

Figure 5

a side view similar to that of Figure 1 - but without a drive member - according to a second embodiment;

Figure 6

a like Figure 2 rotated 90 ° side view of the second embodiment;

Figure 7

a side view of the connecting body facing away from the torsion spring according to the second embodiment with a partial section in the area of one of the screw connections.

The figures all show a section of a shaft 1, as is known in the art Way for the weight compensation and / or the drive of door leaves with vertical Motion component is used, i.e. for single-leaf overhead doors, Lifting gates and in particular overhead or sectional gates; basically Such a shaft can also be used in the area of a winding shaft for roller doors. In the case of the first-mentioned gates, cable drums are on both ends of the shaft provided, the end facing away from these windable and unwound ropes are attached to the door leaf and thus create a gear connection the movement of the door leaf in an accompanying rotational movement of the shaft implement; these facilities are generally known.

In the figures shown, there is preferably one on shaft 1 distributed - a torsion spring 2 shown, limited to the connection area to a chuck 5, the weight balance of the door leaf serving torsion spring 2, in the area of their other, not shown End is held stationary, engages around a connecting cone 3 and at 4 opposite the cone 3 is held against rotation. The cone 3 is in turn non-rotatable the chuck 5 connected or formed, which with four over the circumference evenly distributed radial bores 6 is provided. In these Bores are rod-shaped levers that can be inserted in a conventional manner by hand the chuck 5 under tension of the torsion spring to the standing To turn shaft 1 around. This type of clamping operation is under consideration the installation of shaft 1 in the lintel area, possibly with high door openings tedious and dangerous, especially in the final state of the spring tension considerable Forces occur.

For easier handling and reducing the risk for the fitter a clamping housing 11 which can be placed on the shaft and into which a drive member is provided a high transmission gear 8 is stored, which with a the chuck 5 connected output member is geared. In the In the present versions, this high-speed transmission 8 is a self-locking, single-stage worm gear, so that the drive member of the Worm 10 and the output member corresponds to the worm wheel 9, the latter arranged coaxially to the chuck and connected to it so that it cannot rotate is. At the drive member, here worm 10, is a motor-driven Hand tools, for example electric hand drill optionally from one of the two shaft ends 25 of the screw 10 which has a torsion-proof manner Rotation shaft 24, connectable, so that with the relatively high output speed the drilling machine a relatively slow clamping rotation of the spring can be reached without the handling of the drilling machine causing problems and without the repercussions from the tensioned spring from the drill hold hand when driving from the drill interrupted on the snail.

In the exemplary embodiments according to FIGS. 1 to 4, the chuck 5 is included the worm wheel arranged on the side axially facing away from the torsion spring 2 9 formed in one piece, namely under a molded between them Groove 19. The worm wheel 9 has an approximately quarter circle Toothing parallel in the area axially facing away from chuck 5 to the axis of the shaft 1 and other end directed approximately radially outwards is formed on an annular bead 18 between the and the chuck 5 the circumferential groove 19 is formed.

The clamping housing 11 has a main part 12 and a locking pin 13. Of the Main part is U-shaped in the axial direction of shaft 1 and houses it the worm 10 in its web. In the state applied to the shaft 1 this is included in the base area between the legs 15 and the web and is overlapped by the locking pin 13, which is used for this purpose through holes arranged in alignment in the free end regions of the legs 17 is performed. The shaft is enclosed with such little play that the worm 10 in terms of gear technology in the groove-shaped toothing of the worm wheel 9 intervenes properly. This radial alignment of the worm 10 is supplemented by an axial position lock, which is given in that the Clamping housing 11 with a projection 20 in the groove 19 between the chuck 5th and annular bead 18 engages, as can be seen in FIGS. 1 and 2. The rotation shaft 24, which receives the worm 10 in a rotationally fixed manner or in one piece therewith is located in the area of the web 14 of the clamping housing 11, namely by two ball bearings 26 against axial and radial movements - bearing collars 27 and mounting parts 28 held. At both ends of the rotation shaft 24 are the terminal training 25 for the optional connection to a hand drill from one of the two shaft ends. Preferably the connection designs are designed like a screw head, which correspond in size to the screw heads of the locking screws 22, with which the chuck 5 is rotatably connected to the shaft 1 can be. These locking screws 22 are facing away from her head End provided with cutting edges that are also under the maximum tension of the spring ensure this torsional strength. At 22 is such a locking screw only symbolized, the locking screws are preferably located in the area the hub of the chuck 5 between the radial bores 6.

In that facing away from the shaft 1 or the U-shaped opening of the clamping housing 11 The area of its web 14 has bores 29, 30 and 31, as shown in Figure 1. This in the applied state of the clamping housing 11 Blind holes that run perpendicular to the longitudinal direction of the shaft are used for receiving a boom 32, the support of the clamping housing 11 and thus serves to initiate a reaction torque from the torsion spring. There the torsion spring extends axially in the course of the tensioning process, that is the Sapnngehäuse 11 facing away from the rod-shaped arm 32 with a Rolling body 33, here spherical, provided that around a perpendicular to the longitudinal axis extending axis 34 is rotatable. With this rolling body lies the Boom, for example, at the lintel of the door opening during the tensioning process the torsion spring and rolls on it. As shown in Figures 3 and 4, the blind bores are made in the web 14 from both directions, and in different depths, so that from both sides the possibility of different depth insertion of the boom 32 results, whereby a corresponding "change in length" of the boom, i.e. a different one Distance between web 14 and roller 33 can adjust. One deep blind bore 31 is axially a correspondingly short blind bore 29 ' across from. This applies accordingly to the other two holes provided.

As can be seen from FIGS. 3 and 4, the locking pin 13 has one end provided a handpiece and secured against loss at 23 on the clamping housing fixed. The leg ends receiving the aligned bores 17 are provided with bevels 16 on the outside.

The further exemplary embodiment according to FIGS. 5 and 7 works with the same Clamping housing 11, as in connection with the first embodiment described according to Figures 1 to 4. The second embodiment is characterized by a for retrofitting an existing chuck 5 with radial bores 6 in that the worm wheel 9 having Connection body 35 is provided separately in two parts in the central axis plane is. This connector body 35 engages after application to the shaft, that is Merging its two parts, with pin 36, which are perpendicular to Partition plane extend radially inwards in two diametrically opposite one another Radial bores of the chuck 5 a. The two halves of the connector body 35 are joined by means of two screw connections 37, which each pass through a sleeve 38 which in correspondingly aligned holes of the two parts of the connecting body 35 in the respective screw area are used. Due to the adapter sleeves 38, the alignment and spacing of the two parts determined exactly, so that the formation of the worm gear 9 is technically flawlessly manufactured. Both the pins 36 as well as the adapter sleeves 38 and thus screw connections 37 are each in axially projecting regions 39 of the connecting body 35. Also in this The exemplary embodiment is the toothing 40 of the worm wheel 9 in the form of a groove as stated in the first embodiment, which is why the one to be used in each case Clamping housing 11 can match.

Claims (14)

1. Tensioning device (7) for at least one torsion spring mechanism (2) which is associated with a shaft (1) which is in geared connection with a door - preferably an up-and-over one-piece or sectional door, e.g. a sectional roller door - and accompanies the movement of the door, converted into a rotary movement, the torsion spring mechanism (2) being fixed in place at one end, preferably the end which faces the associated shaft mounting, in such a way that it cannot rotate, and being attached at its other end to a chuck (5) which is rotatable about the shaft (1) and - after the tensioning of the spring (2) by rotation of the chuck (5) - is lockable on the shaft (1) so as to rotate therewith, said chuck (5) being provided with the coaxial worm wheel (9) of a preferably self-limiting worm gear (8) the worm (10) of which is mounted, for geared connection to the worm wheel (9), in a tensioning housing (11) which can be fitted on the shaft (1) or chuck (5) for the purpose of tensioning the torsion spring, said chuck (5) also being connectable to a conventional hand tool with a rotary drive, such as a hand drill, which is motor-driven, particularly by an electric motor, said tensioning housing (1) being constructed in at least two parts in the circumferential direction for the purpose of placing it on the shaft (1), and comprising a cantilever (32) extending at right angles to the longitudinal direction of the shaft (1) in the assembled state, for transmitting the reaction momentum introduced into the tensioning housing (11) by the torsion spring mechanism (2) which is to be tensioned, into a fixed support, particularly the interior contact region of the door aperture which is to be closed off by means of the door, and is guided, in its mounted position on the shaft (1) and in geared engagement, so as to prevent axial movements relative to the chuck (5) and secure it relative to the worm wheel (9), characterised in that the teeth of the worm wheel (9) are fillet-shaped with an end portion running substantially in the axial direction of the shaft away from the chuck (5) and a terminal portion running substantially radially outwards, the latter being formed on a radially leaning annular bead (18) on whose axially opposite shoulder, or more particularly groove (19), the tensioning housing (11) engages, secured against relative axial movements.
2. Tensioning device according to claim 1, characterised in that the tensioning housing (11) has a main part (12) which fits around the shaft (1) in a U-shape, and a locking pin (13) which can be inserted in aligned bores provided in the end portions of the two arms (15) in such a way that the shaft (1) accommodated in the assembled position between the crosspiece (14) and the arms (15) of the main part (12), by the locking pin (13), acts on the outer surface of the shaft (1) opposite the web (14) in such a way that the geared connection between the main part (12) of the tensioning housing (11) or the worm (10) mounted therein and the chuck (5) or its worm wheel (9) is secured.
3. Tensioning device according to claim 1 or 2, characterised in that the worm wheel (9) of the worm gear (8) is connected to the chuck (5), more particularly flanged thereon.
4. Tensioning device according to claim 1 or 2, characterised in that the worm wheel (9) of the worm gear (8) is made in one piece with the chuck (5).
5. Tensioning device according to one of claims 1 to 4, characterised in that the chuck (5) is provided with structures for the use of manually operated tensioning levers, particularly a plurality of radial bores (6) distributed in the circumferential direction for accommodating bars as tensioning levers.
6. Tensioning device according to one of claims 1 to 4, characterised in that the chuck (5) is formed with an integrated worm wheel (9) and in several parts, preferably split in two along the central axial plane, for fitting to existing torsion spring shafts.
7. Tensioning device according to claim 3, characterised in that the worm wheel (9) which is to be attached coaxially to the chuck (5), particularly by flanging, for rotation therewith, is constructed in several parts, preferably split along the central axial plane, for fitting to existing torsion spring shafts.
8. Tensioning device according to one of claims 5 to 7, characterised in that the worm wheel (9) is formed on a connecting member (35) which is split in two along the central axial plane and is provided with pegs (36) projecting substantially perpendicularly towards the central plane, these pegs engaging in radial bores (6) provided opposite them in the chuck (5), in the position of mounting on the shaft (1).
9. Tensioning device according to one of claims 5 to 8, characterised in that the chuck (5) constructed in several parts, particularly in two parts, with an integrated worm wheel (9), or the latter worm wheel, particularly formed on a connecting member (35), can be assembled by means of screw fixings (37) which pass through securing sleeves (38) which define a spacing.
10. Tensioning device according to one of claims 1 to 9, characterised in that the tensioning housing (11) engages, with an annular projection (29), on a shoulder of a groove construction (19) which is formed in the circumferential region of the integrated unit of chuck (5) and drive means (9) or the worm wheel (9) which is connectable to the chuck (5) or the connecting member (35) which comprises said worm wheel, or conversely the shoulder or groove is provided in the tensioning housing and the projection in the region of the chuck/worm wheel.
11. Tensioning device according to one of claims 8 to 10, characterised in that the pegs (36) and the screw fixings (37) are provided on axially projecting areas (39) of the connecting member (35).
12. Tensioning device according to one of claims 1 to 11, characterised in that the rotation shaft (24) of the worm (10) of the worm gear (8) is accessible from both ends for the purpose of attaching the hand tool.
13. Tensioning device according to one of claims 1 to 12, characterised in that the cantilever (32) is adjustable in length so that it can be inserted with its end, constructed as a bar-shaped element, facing the tensioning housing, in one of a number of blind bores (29, 30, 31) of different depths formed in its web (14), the blind bores (29, 30, 31) being formed so as to be accessible particularly in both directions at right angles to the longitudinal axis.
14. Tensioning device according to one of claims 1 to 13, characterised in that, in the end of the cantilever (32) remote from the tensioning housing (1), there is an abutment member (33), wheel shaped or more particularly spherical, which is rotatable about a spindle (34) running at right angles to the longitudinal direction of the shaft (1).

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