CA2008302A1

CA2008302A1 - Drum for receiving a rope

Info

Publication number: CA2008302A1
Application number: CA002008302A
Authority: CA
Inventors: Michael Hormann
Original assignee: Michael Hormann; Marantec Antriebs - Und Steuerungstechnik Gmbh & Co. Produktions Ohg
Current assignee: Marantec Antriebs und Steuerungstechnik GmbH and Co KG
Priority date: 1989-01-27
Filing date: 1990-01-23
Publication date: 1990-07-27
Also published as: ES2054105T3; EP0379977B1; JPH02233499A; EP0379977A1; JP2754070B2; DK0379977T3; ATE106358T1; DE59005847D1; DE3902496A1

Abstract

DRUM FOR RECEIVING A ROPE

A b s t r a c t A drum for receiving a rope, particularly in conjunction with the moving of a doorblade, which drum has formed on its casing outer surface a guide groove proceeding like a screw in the drum circumferential and axial direction , the wound-up rope being received in this guide groove so as to be guided in a single layer, and the said guide groove being deviced for simple and inexpensive manufacture in a manner such that at least the casing wall consists of sheet metal into which the guide groove is impressed, namely as a whole manufactured by means of flow deformation.

Description

20(~830~

DRUM FOR R~CEIVING A ROPE

lo This invention relates to a drum for receiving a rope having the features of the gensric notion of claim l.
Such drums are used in particular for ropes which are part of an operating and/or equilibration means for a door blade, especially of the type which is moved overhead and consists of successive members articulated to one another in the moving direction.

Depending on the force-distance-characteristic of the procsss of motion to be carried out and, in particular, on that one of a spring provided for equilibration, such drums provided with guide grooves for the rope are formed regularly cylindrically, conically or so as to change from regularly cylindrical shape into conical shape, a progressive increase in the diameter being possible to be provided within the scope of the conical shape so that a corresponding line of spring force can be compensated by the differently increasing rope wrapping diameter.

Such drums are known, namely manufactured in the form of cast parts, especially die-cast parts, also of light metal alloys. Such drums are therefore complicated and expensive in manufacturing and their weight is still relatively high, even if made of cast aluminium.

~0(3 Accordingly, the invention is based on the object of providing a drum of the type described above which is less complicated and expensive to manufacture and has, in case, less weight than the one according to prior art.

Starting from a drum having the features of the generic notion of claim l, this object is colved by the lo characterizing features thereof.

According to the invention at least the drum casing wall with the guide groov0s for the rope is made of sheet metal which is worked without cutting, namely in a metal spinning process raquiring flow deformation of the sheet metal. In a preferred embodiment this results in a substantially undulated shape in the area of the drum casing wall in a longitudinal section through the drum axis, the troughs appearing at the casing wall outer surface having the cross section of the guide groove and the troughs present at the casing wall inner surface facing towards the drum axis being located radially oppoæite to the raised zones between the adjacent groove windings occuring at the outer surface.
In a particularly preferred embodiment at lea~t the drum casing wall is made of sheet metal which sub6tantially plane shape is changed into the casing wall shape by way of flow dsformation. In this on both 3e frontside edges of the drum casing wall radially projecting integrally formed collars may be provided.
Here it is especially preferred to form one of the drum frontside walls integrally with the drum casing wall, respectively the adjoining collar. In this case the proce~s is such that the sheet metal in the portion of this drum frentside wall, re~pectively in a radially inner portion is supported in the machine tool and put into rotation around the axis of the drum to be manufactured preferably through this supporting engagement. It is basically possible to device the forming tool engaging at the sheet metal so that it rotates around this drum axis and to keep the sheet metal stationary. Preferablyr however, the sheet metal is put into rotation, whereas at least the forming tool lo engaging at the outer surface of the dxum casing wall to be manufactured does not rotate around the drum axis. The direct engagement of such a tool, between which and the sheet metal a relative movement takes place, is normally effected via one or more roller bodies in order to avoid any frictional angagement.

The forming tool at lea~t has a tool part which engages at the outer surface of the drum casing wall to be manufactured. Depending on the sheet metal material, required accuracy, manufacturing speed, machine equipment of the forming machine and the like, it may be advantageous or necessary at least in the course of the formation of the guide grooves that the sheet metal in the portion of the drum casing wall is received between two tool parts which are adapted to one another or are at least correspondingly profiled with respect to the positive formation of the guide grooves on the outer surface and their negative formation on the inner surface of ths drum casing wall. There can be provided, for example, a mould or matrix having the negative profile of the guide groove on its casing outer surface and being arranged coaxially with the drum axi~ and adapted to the inner cylinder and/or conical shape against which the sheat metal is moved by mean~ of a pressing tool part engaging at the outer surface and is 20GS ~

formed or shaped following the course of the profile of the guide groove.

In this the pressing tool part effects a feed corresponding to the pitch of the screw-shaped guide groove in the direction of the drum axis, namely responsive to the relative speed between sheet metal an~ forming tool. The mould arranged coaxially wi~h the drum axis can rotate or revolve together with the sheet metal at the same rotational speed. Still another embodiment can work with a set of rollers consisting of profiled rollers engaging at the outer and inner surfaces of the drum casing wall which are displaceable towards each other and in their totality are ~orcibly guided with a motional component in the direction of the drum axis following the pitch of the guide groove such that the sheet metal portion of the drum casing wall respectively received therebetween is shaped together with the guide groove after the matching of pitch and peripheral speed. Instead of roller~, for example, which only have the profile of one windin~, respectively the negative profile of the web formed therebetween such rollers may be used which have two or more guide groove web profiles, respectively their negative formations succeeding one another in the axial direction of the drum, the feeding speed and the relationship of the drum and roller diameter being matched correspondingly. According to another embodiment there may be provided plural rollers succeeding one another in the a~ial direction which correspondingly applies also to the cooperation between rollers and mould. Furthsrmore, one and the same forming tool or tool part can be successively guided multiple times along the drum casing wall engaging at the same.

~

Furthermore, it may be advantageous or necessary to effect the deformation of a sheet metal plate especially one which is substantially plane - into the drum shape by means of a separate pre-working tool with which the shest metal is first changed into the shape of the regularly cylindrical, conical or succe~sivsly circular-conical drum casing wall, while thereafter the guide groove and, in case, the frontside collars and lo the like are formed in one process or separately in a subsequent process, the frontside collars being able to be formed also in the first spinning process. The contour of the regularly cylindrical, respectively conical wall of the drum casing preferably corresponds to approximately the longitudinal section connecting line in the outer, inner or intermediate peripheral portion of the wave form of the drum casing wall guide groove progression. In such a successive manufacturing process of the drum wall contoux first and the engraving of the guide groove next different relative speeds may be provided, for example, first at a high relative speed, respectivelr revolving speed of the sheet metal part the shaping of the drum casing wall contour and subsequently at a low speed the engraving of the guide groove.

In such a case the forming tool part-portion engraving the guide groove can be deviced irrespective of any coarse shaping of the sheet metal taking place in the axial direction, namely up to the development of profiled rollers, one of which being arranged coaxially with the drum axis and provided on the outer casing surface thereof with the negative profile of the guide groove progression and the other one, which engages the pre-shaped sheet metal from the radial outside, having Z0~8~0~

the guide groove web profile appearing at the outsr surface of the drum casing wall, namely formed with the drum radius so that a motional component of ~uch a groove engraving mould member directed towards the drum axis is dispensable. If it is talked about a profile here, then in terms of a line following the profile surface in the longitudinal section direction.

Of course, starting from this pre-contoured roller construction, embossing work to be carried out in order to form the guide grooves can be done with other forming tools as described above, for example with the aid of a set of rollers.

Starting from the idea of such a regularly cylindrical and/or conical contour of the drum casing wall one may imagine as a starting point for the drum manufacturing a tube of sheet metal which i5 formed seamless or longitudinally or spirally welded, preferably in a fusion welding process using a laser beam. Not only can such a tube be embossed or engraved with respect to the forming of the groove progression per S9, but in the course of thi.s working ~tep it may be formed into conical or partly conical shape with or without progressiYe diameter and it may be al~o provided with frontside collars delimiting the reception area of the rope reception guided in a single layer and ~erving for the attachment of frontside walls.

In the course of manufacturing the drum by means of metal spinning along with a front wall integrally joining the drum casing wall or with the starting shape of a tube a tool engaging at the inner upper surface of the casing can be removed without any problems through the open frontsides, respectively one of them. This 20~83r~

also applies in case of a mould or matrix arranged coaxially with the drum axis which by virtue of the spiral course of the guide groove can be turned out of the finished former, a corresponding clearance being existing because of the unavoidable residual backspringing of the sheet metal with re~pect to the mould or matrix.

This and other preferred embodiments of the invention result from the subclaims, particularly with reference to the examples which are reflected in the drawings and which subsequent description more clearly explains the invention. There is shown in:

Figure 1 a ~ide view of an embodiment of a drum with a drum frontside wall integrally joining the drum casing wall, in the upper hal~ as a longitudinal sectional view through the drum axis, namely merely in respectof the contour of the sectioned wall portions;

Figure 2 a partial sectional view of the connection between the separate frontside wall and the adjoinin~ side edge portion of the drum casing wall corresponding to Figure 1 in a modified form;

Figure 3 a partial sectional Yiew corresponding to Figure 2 in another modified form.

The three embodiments reflected in the drawings are respectively based on a drum having a basical structure such as shown in Figure 1, i.e. a drum with which one 2008~

of the frontside walls is formed integrally with the drum casing wall. This corresponds to the manufacturing of a drum from an approximately plane &heet metal disk by the engagement of a forming or pressing tool which from this frontside i8 guided in the axial direction towards the other frontside collar of the drum, namely taking into consideration the course of the guide groove to be formed in the portion of the drum casing wall.

The drum which is altogether designated by reference numeral 1 has a drum casing wall 2 which towards the left side of the drawing integrally changes into a frontside wall 3, whereas at the axially opposite side end it is clo~ed by separate frontside wall 4 not integral with the drum casing wall 2.

The frontside wall 3 formed integrally with the casing wall 2 has an axle hub 5 which is formed as one part with the frontside wall 3 and can be co-~haped in the course of the metal spinning process. This is possible, for example, in that a plane or flat sheet metal disk is gripped by a turning tool in the mouth portion surrounded by the axle hub 5, whereupon a forming tool is moved in the axial direction from the gripping or clamping position thereby 3haping the regularly cylindrical wall of the axle hub 5. This is followed without spinning deformation by the frontside wall 3, whereupon the further shaping of the casing takes place. For this purpose a mould or matrix is providsd which in a manner not shown in the drawings supports the frontside wall 3 from the inside of the drum and has on its casing outer surface the negatiYe contour appearing by virtue of the course of the guide groove at the inner side of the casing wall ~, as will be more 2~08 clearly explained later. A pressing or forming tool engaging at the sheet metal disk is then guided so that the course of tha guide gxoove results, namely followin~ the contour of the outer surface of the drum casing wall 2 and, under consideration of the pitch of the course of the guide groove with radial and axial pressure, the matrix contour. As can be seen from Figure 1, al50 the separate frontside wall of sheet metal can be provided with a hub extension 6 which, in lo case, can also be integrally formed at the frontside wall 4 by means of metal spinning. The axle hub 5 is penetrated by a screw 7 inserted in a bore provided in a hollow axle (not shown) of a shaft carrying an equilibration torsional spring so that the drum is lS axially and unrotatably connected to the hollow hub.
Similar screw means can be provided also in the zone of the hub extension 6. The axle hub 5 and/or hub extension 6 can also be provided as separate parts, e.g. of pre~sure diecaæting, to be interconnected with the sheet metal, above all when high torques are to be transmitted.

As ~an be seen from the lower half of the side view in Figure 1 and ~rom the sectional view above the drum a~is 11, the drum ~asing wall 2 i8 provided with a screw-shaped guide groove 8 which groove for receiving a rope (not ~hown) appears at the outer surface 9 of the drum casing wall 2. The guide groove 8 is impressed in the sheet metal of the drum casing wall 2 under flow deformation so that the wall 2, viewed in longitudinal section, is given an undulated shape such as can be seen from the upper half of Figure 1, namely in a material and weight-saving manner. The troughs 10 appearing at the outer surface of the wall 2 form the receiving portions of the guide groove windings for the 8~

engagement of the rope not shown, whereas, when viewed from the direction of the drum axis 11, the inner surface 12 of the drum casing wall 2 has trough~ 13 which, when viewed in the radial direction, are located opposite to the zones 14 which are raised with regard to the outer surface 9 and which separate the troughs 10 of the guide groove windin~s from one another. The troughs 10 and raised zones 14, which can be seen from the upper cross-sectional view of Figure 1, run into o one another in the course of the progression of the guide grooves to from closed circumferential portions.

Viewing to the left, the drum casing wall 2 i~ provided on the side edge 17 adjoining the integrally formed frontside wall 3 with a radially projecting collar 15 which correspondingly laterally delimits the rope receiving portion of the drum casing wall 2 and forms the integral transition between the casing wall 2 and frontside wall 3. The side edge 18 located oppositely when viewed in the axial direction is also formed as a radially outwardly projecting collor 16 which æarves for tha fi~ing of the separately ~ormed frontsida wall 4. In the embodiment according to Figure 1 this front3ide wall 4 is rigidly connected to the collar 16 of the side edge 18 of the drum casing wall 2 by means of spot weldings 19 distributed over the circumference.
In this manner the drum is supported with both frontsides on the hollow shaft not shown.

In Figure 2 there is shown a partial section of the upper right connecting portion between the drum casing wall 2 and the separate fxontside wall 4, wherein a connectin~ method other than welding is realized. In the portion of the side edge of the drum ca~ing wall 2 the radially proje~ting collar 16` is performed longer 20(~

and, after applying the separate frontside 4, iæ beaded around the circumferential edge 21 thereof. The bead is designated by reference numeral 20. The bead may be carried out continuously throughout the circumference or, however, in ~eparate ~ections distributed over the circumference.

Figure 3 reflects a partial section corresponding to Figure 2 wherein the connection of the side edge 18 to ths circumferential edge 21` o~ the separate frontæide wall 4 with the aid of circumferentially distributed pressure joints 22~is realized. In the embodiment shown the pressure joints 22 are made into the collar 16`` of the side edge 18 of the drum casing wall 2 from the circumferential edge 21`of the frontside wall 4 so that portions are produced which are projecting when viewed towards the axial drum center. In order to not obstruct the ascent and descent of the rope the circumferential edge 21` of the frontside wall 4 and the collar 16``
are axially slightly outwardly bent when viewed from the axial center of the drum. The collar 16``is additionally provided with a centering edge projecting in the axial direction for receiving the frontside wall 4.
The drum reflected in total in Figure 1 serves for receiving a rope which is fixed with its end descending from the drum to a doorblads which is moved overhead in order to provide with the aid of a torsion spring positively engaging a hollow shaft unrotatably connected to the drum an equlibration meanæ for the doorblade such as known in prior art. For the compensation of the force-di~tance-characteristic of the torsion spring the drum according to the present embodiment is formed regularly cylindrically in a first ( clln~h connec~ ion) portion 23 which is followed by a conical portion 24 which, viewed from the regularly cylindrical portion 23, is formed with progressively increasing diameter.

Claims

1. A drum for receiving a rope - particularly one of an operating and/or equilibration means for a doorblade - on its casing outer surface which has a guide groove progressing in the form of a screw in the circumferential and axial directions of the drum wherein the wound-up rope, particularly steel rope, is received and correspondingly guided in a single layer, characterized in that at least the drum casing wall (2) consists of a sheet metal into which a guide groove (8) is impressed.

2. Drum according to claim 1, characterized in that the sheet metal in the are of the drum casing wall in the longitudinal section laid through the drum axis (11) is formed to proceed substantially undulated, the troughs appearing at the casing outer surface (9) having the cross section of the guide groove (8) and the troughs (13) present at the casing inner surface (12) facing towards the drum axis (11) being located radially opposite to the raised zones (14) between the adjacent groove windings.

3. Drum according to claim 1 or 2, characterized in that at least the drum casing wall (2) - which is preferably provided with collars (15,16) integrally adjoining and radially projecting from the frontside edges (17,18) - consists of sheet metal which from its substantially plane or flat original shape is changed into the casing shape by means of flow deformation (metal spinning).

4. Drum according to one of the claims 1 to 3, characterized in that one of the drum frontside walls (3) is integrally co-formed out of the sheet metal of the drum casing wall (2).

5. Drum according to claim 4, characterized in that at the frontside wall (3) an axle hub (5) is integrally formed for the support on a shaft penetrating the drum (1) -

6. Drum according to one of the claims 1 to 5, characterized in that at least one of the drum frontside walls (4) is formed as a separate sheet metal disk which is fixed to the abutting side edge (18, respectively collar 16) of the drum casing wall (2).

7. Drum according to claim 6, characterized in that the separate drum frontside wall (4) is fixed to the side edge (18, respectively collar 16) of the drum casing wall by means of welding, particularly spot weldings (19) distributed over the circumference.

8. Drum according to claim 6, characterized in that the fixing of the separate drum frontside wall (4) is formed by the beading (20) of the side edge (18, respectively collar 16) of the drum casing wall (2) about the outer circumferential edge (21) of the drum frontside wall (4).

9. Drum according to claim 6, characterized in that the separate frontside wall (4) is fixed to the side edge (18, respectively collar 16`) of the drum casing wall (2) by pressure joints (22) - especially distributed over the circumference.

10. Drum according to one of the claims 1 to 9, characterized in that the drum casing wall (2) is formed regularly cylindrically, conically or in two sections (23,24) succeeding one another in the direction of the drum axis regularly cylindrically and conically.

11. Drum according to claim 10, characterized in that the cone (24) is formed with progressively increasing diameter when viewed in the axial direction of the drum.

12. Drum according to one of the claims 1 to 11, characterized in that the sheet metal consists of steel, stainless steel or alloy-modified steel and/or is surface-treated, e.g. galvanized.

13. Method of manufacturing a drum according to one of the claims 1 to 12, characterized in that a sheet metal and a forming tool pressingly engaging thereat with at least one tool part are moved relative to each other at least in circumferential direction to the drum axis.

14. Method according to claim 13, characterized in that between the forming tool and the sheet metal there is additionally carried out a movement directed vertically to the drum axis.

15. Method according to clam 13 or 14, characterized in that the drum casing wall with an integrally adjoining drum frontside wall if formed out of a sheet metal disk which prior to the spinning engagement of the forming tool has an approximately plane or flat shape.

16 16. Method according to claim 15, characterized in that the sheet metal disk in the area of the one frontside wall of the drum to be manufactured is connected to a turning tool which relatively turns the sheet metal disk with respect to the forming tool about the drum axis throughout the forming process.

17. Method according to claim 15 or 16, characterized in that the sheet metal disk is spinned into the drum shape first by means of a pre-working tool which is movable or additionally movable in the direction of the drum axis and is then provided by means of an embossing tool with the screw-shaped guide groove.

18. Method according to claim 13 or 14, characterized in that the sheet metal which has been formed into tubular shape prior to the deformation is by means of a forming tool merely provided with the screw-shape guide groove and, in case, with collars in the portion of the frontside edges

19. Method according to claim 17 or 18, characterized in that the drum casing wall is received between two profile rollers one of which having the guide groove progression to be formed on the outside of the drum casing wall and the other one having the undulation appearing at the inner surface of the drum casing wall and being able to be operated as a rotating roller parallel to the axis of the drum or as a mould or matrix coaxially arranged with the drum axis.

20. Method according to one of the claims 13 to 18, characterized in that the forming tool is used with a forming matrix engaging at the one drum casing surface - preferably at the drum casing inner surface - of the sheet metal and a forming tool part engaging at the respectively other surface of the drum casing wall, the forming tool part being displaced in the direction of the drum axis relative to the sheet metal in proportion to the pitch of the screw-shaped groove progression.

21. Method according to one of the claims 13 to 18, characterized in that the forming tool is used with a set of rollers engaging at both sides of the drum casing wall with rollers being movable vertically to the drum axis towards each other and away from each other, the set of rollers being displaced in the direction of the drum axis relative to the sheet metal in proportion to the pitch of the screw-shaped groove progression.

22. Method according to one of the claims 13 to 18, characterized in that the forming tool, respectively at least one of its parts forming the guide groove can be passed multiple times over the drum casing wall thereby repeatedly engaging at the drum casing wall or that plural forming tools, respectively forming tool parts forming the guide groove can be successively passed over the drum casing wall thereby embossingly engaging at the drum casing wall.

23. Method according to one of the claims 13 to 22, characterized in that the open frontside(s) of the casing wall body is (are) respectively closed with the aid of disk-shaped sheet metals which in the portion of their outer periphery are connected to the respective frontside border, respectively the collars of the drum casing wall there provided, for example, by welding, bordering or pressure joining, the frontsides being able to be provided, in case, with hub portions formed by spinning.+