US20070138333A1 - Metal spool - Google Patents
Metal spool Download PDFInfo
- Publication number
- US20070138333A1 US20070138333A1 US11/641,595 US64159506A US2007138333A1 US 20070138333 A1 US20070138333 A1 US 20070138333A1 US 64159506 A US64159506 A US 64159506A US 2007138333 A1 US2007138333 A1 US 2007138333A1
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- United States
- Prior art keywords
- core
- spool
- flanges
- flange
- winding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H75/00—Storing webs, tapes, or filamentary material, e.g. on reels
- B65H75/02—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks
- B65H75/04—Kinds or types
- B65H75/08—Kinds or types of circular or polygonal cross-section
- B65H75/14—Kinds or types of circular or polygonal cross-section with two end flanges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H75/00—Storing webs, tapes, or filamentary material, e.g. on reels
- B65H75/02—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks
- B65H75/18—Constructional details
- B65H75/24—Constructional details adjustable in configuration, e.g. expansible
- B65H75/241—Constructional details adjustable in configuration, e.g. expansible axially adjustable reels or bobbins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/50—Storage means for webs, tapes, or filamentary material
- B65H2701/51—Cores or reels characterised by the material
- B65H2701/511—Cores or reels characterised by the material essentially made of sheet material
- B65H2701/5114—Metal sheets
Definitions
- the invention relates to a metal spool for receiving metallic winding material in the form of a wire, comprising two flanges in the form of circular disks, arranged parallel to one another and having the same diameter and an elongate core connecting these flanges and having a circular cross section and smaller radial dimensions in comparison with the flanges, the mid-axis of which core corresponds to the mid-axes of the flanges, in which spool a winding space for receiving the winding material is delimited by the core and the two flanges, and in which spool the distance between the flanges can be altered elastically by forces acting on them (DE 41 38 189 A1).
- spools have long been known and available on the market. In the known technology, they are used for winding up metallic wires which are envisaged, in particular, as structural elements of electrical cables and lines. Spools in which the distance between the flanges can be altered are known.
- DE 41 38 189 A1 mentioned at the outset, describes a spool in which transverse stresses occurring when spooling wire which is subjected to temperature are intended to be compensated for in a controlled manner.
- the flanges are arranged on the core such that they can move in the axial direction. Once the spooling has come to an end, the spool has its rated dimension owing to the displacement of the flanges towards the outside.
- DE 33 12 178 A1 describes a spool having a core comprising two parts, of which in each case one is attached to one flange.
- the parts of the core engage telescopically one inside the other and can be connected to one another by being latched in different relative positions for the purpose of setting different core lengths.
- a similar spool having a core comprising two parts is described in U.S. Pat. No. 3,840,198 A, in which the flanges are connected to one another via spring elements.
- the wires are provided with predetermined diameters by means of mechanical processing and, for example, bending properties which can be set in a targeted manner by thermal treatment.
- the thermal treatment takes place, for example, using so-called “annealing spools” consisting of metal, in particular of steel, onto which the wires are wound and, in the wound-on state, are subjected to an annealing treatment together with the spools.
- annealing spools consisting of metal, in particular of steel, onto which the wires are wound and, in the wound-on state, are subjected to an annealing treatment together with the spools.
- the required mechanical and electrical properties of the wires can thus be set with a sufficient degree of accuracy.
- problems often occur when withdrawing the wires, which have cooled down again after the annealing, from the spools since the wires can be “caked” to one another by the annealing process.
- the material of the wires provided for electrical applications expands to a greater extent on heating than the material of a spool consisting of a metal having a high tensile strength, in particular of steel.
- copper but in particular to aluminum
- aluminum has a coefficient of thermal expansion which is greater by a factor of approximately 2, while this factor is approximately 1.4 for copper in comparison with steel.
- the expansion of a wire which has been wound onto the spool with a large number of turns during heating in the annealing process is then drastically impeded by the respective spool. As a result, the turns of the wire not only push against the flanges of the spool, but they are also pushed against one another with a considerable amount of force. This results in the abovementioned caking of the wire turns.
- the invention is based on the object of designing the spool outlined at the outset such that caking of the wires during an annealing process can be ruled out with a high degree of reliability.
- the core of the spool can, for example, itself be designed to be so elastic that, as a result of the heating during an annealing process, it is extended reversibly owing to the pressure exerted, for example, on the flanges of the spool when the wire turns expand.
- the individual wire turns can expand relatively unimpeded, however, in all embodiments of the spool during the annealing process owing to the expansion of the winding space, and the pressure exerted on these wire turns is as a result considerably reduced.
- the corresponding “extension distance” of the winding space is dependent on the level of the annealing temperature, of the coefficient of thermal expansion of the material for the wire wound on and of the size of the spool. It is, for example, between 2 mm and 10 mm.
- the elasticity of the core existing in the axial direction can be achieved by spring elements acting in the axial direction being incorporated, but with particular advantage owing to the use of a tube as the core, which tube is corrugated all the way around at least in an axial section transversely with respect to its axis, preferably over its entire length.
- Caking of the wire turns during an annealing process can also be ruled out with a high degree of reliability in another embodiment of the spool when the material of said spool has a coefficient of thermal expansion which corresponds at least approximately to that of the material for the wire wound onto the spool.
- FIG. 1 shows a view of a spool known in principle.
- FIGS. 2 to 6 show different embodiments of the core of a spool according to the invention.
- FIG. 7 shows a further embodiment of the spool according to the invention.
- FIG. 8 shows a section through FIG. 7 along the line VIII-VIII.
- FIG. 9 shows a detail of the spool shown in FIG. 7 in an enlarged illustration.
- FIG. 10 shows a further embodiment of the spool.
- FIG. 11 is a graph of the displacement travel of the flanges over the length of the core at different temperatures.
- the spool illustrated in FIG. 1 has two flanges 1 and 2 in the form of circular disks and having the same diameter.
- the flanges 1 and 2 consist of a metal having a high tensile strength, in particular of steel. They are arranged parallel to one another in the spool and are connected to one another by a core 3 , which likewise consists of metal and, in the exemplary embodiment illustrated, is cylindrical.
- the elongate core 3 could also be conical.
- the mid-axes of the flanges 1 and 2 and the core 3 correspond to one another.
- a winding space 4 serving the purpose of receiving the winding material is delimited by the flanges 1 and 2 and the core 3 .
- the spool according to the invention consists of metal and is used for receiving winding material in the form of wire, which is wound on with a large number of turns and likewise consists of metal—referred to below as “wire” for short.
- the upper part of FIG. 1 shows a large number of turns 5 of a wire.
- Its material should have a markedly greater coefficient of thermal expansion than the material for the flanges 1 and 2 and, in a preferred embodiment, also for the core 3 .
- All parts of the spool therefore preferably consist of steel, and the wire is preferably a copper-cladded aluminum wire—referred to below as “CCA wire”, for short.
- CCA wire copper-cladded aluminum wire
- a spool which has been fully wound with CCA wire is introduced into an annealing furnace for an annealing treatment of the CCA wire and is heated there, for example, to temperatures of between 400° C. and 600° C.
- the turns 5 of the CCA wire expand to a greater extent than the spool or its core 3 .
- the distance between the flanges 1 and 2 can be extended elastically or reversibly such that the winding space 4 can be altered in the direction of the mid-axis of the spool.
- the displacement travel of the flanges 1 and 2 at an increased temperature or the expansion of the winding space 4 can be calculated, starting from a length at room temperature and subsequent return to the initial position at room temperature.
- the elements required for the reversible change in length can then have corresponding dimensions.
- the dependence of the length el of the “displacement travel” on the level of the annealing temperature is shown, for example, in FIG. 11 for an aluminum wire which has been wound onto a steel spool.
- a core having a length of 1000 mm is accordingly extended at a temperature of 200° C. by 2 mm, while the extension at 400° C. is approximately 4.8 mm, i.e. more than double that at 200° C. This effect is even more serious at a core length of 2000 mm.
- the extension at 200° C. is approximately 3.8 mm and 9.5 mm at 400° C.
- the respective extension of the core which is reversed when the wound spool is cooled to room temperature, is necessary, as mentioned above, in order that the wire turns do not cake to one another during annealing and subsequent cooling.
- the expansion of the flanges 1 and 2 which likewise occurs at increased temperature, is so low in relation to the extension of the core that it is negligible.
- the core 3 may be in the form of a tube 6 , which is corrugated all the way round transversely with respect to its axis over its entire axial length. Since the core 3 is fixedly connected to the two flanges 1 and 2 , it is expanded by the turns 5 of the CCA wire which are expanding and pressing against the flanges 1 and 2 , with the result that the clear width of the winding space 4 is increased. When the spool and the CCA wire are cooled, the core 3 returns to its original length.
- the core shown in FIG. 3 is in the form of a tube 7 , which is corrugated all the way round transversely with respect to its axis at least in an axial section.
- the core 3 is fixedly connected to the flange 1 and connected to the flange 2 via a spring mechanism 8 .
- a spring mechanism 8 can also be provided in each case between the two flanges 1 and 2 and the core.
- the core can also comprise two tubes 9 and 10 , which engage telescopically one inside the other, bear against one another such that they can move in relation to one another and are connected to one another via a spring mechanism 11 .
- the tube 9 is only fixedly connected to the flange 1 , while the tube 10 is fixed to the flange 2 .
- the core can also be designed such that there are no substantial measures for elastically changing its length.
- the core 12 may consist of aluminum and therefore substantially of the same material as the CCA wire. It therefore has at least approximately the same coefficient of thermal expansion as the CCA wire, with the result that the expression in parentheses in the above equation in the extreme case is equal to zero. With this design of the spool as well, no substantial pressure is applied to the turns 5 of the wire.
- This embodiment of the spool is generally designed such that the material of the core 12 has at least approximately the same coefficient of thermal expansion as the material of the wire which has been wound on and is to be annealed.
- FIGS. 7 to 9 One preferred embodiment of the spool is shown in FIGS. 7 to 9 :
- an intermediate flange 14 is mounted on a core 13 of the spool such that it can be displaced in the axial direction of the core 13 , to be precise in the vicinity of the flange 2 .
- the intermediate flange 14 likewise consists, for example, of steel. It is connected to the flange 2 via springs 15 .
- springs 15 are provided which are offset with respect to one another uniformly in the circumferential direction.
- bolts 16 are provided which are attached fixedly to the intermediate flange 14 and pass through holes 17 in the flange 2 , as is shown in a detail in FIG. 9 .
- four bolts 16 which are offset with respect to one another in the circumferential direction, may be provided. They also prevent the intermediate flange 14 from tilting on the core 13 during displacement of said core.
- the winding space 4 is therefore delimited by the flange 1 and the intermediate flange 14 .
- the intermediate flange 14 moves in the direction of the stationary flange 2 .
- the springs 15 which are pushed together in the process, move the intermediate flange 14 back into its initial position if the temperature returns to room temperature.
- the spool in the embodiment shown in FIG. 7 is particularly robust since the flanges 1 and 2 are fixedly connected to the core 13 .
Abstract
The invention specifies a metal spool for receiving metallic winding material (5) in the form of a wire, which spool comprises two flanges (1, 2) in the form of circular disks, arranged parallel to one another and having the same diameter and an elongate core (3) connecting the flanges and having a circular cross section and smaller radial dimensions in comparison with the flanges (1, 2), the mid-axis of which core corresponds to the mid-axes of the flanges (1, 2). A winding space (4) for receiving the winding material (5), is delimited by the core (3) and the two flanges (1, 2). The dimensions of the winding space (4) in the direction of the mid-axis of the spool can be enlarged at an increased temperature. In addition, means are provided to bring the dimensions of the winding space (4) back to the initial position when the temperature returns to room temperature.
Description
- This application claims priority under 35 USC §119(a) to German Patent Application No. DE102005060279.7 which was filed on Dec. 16, 2005.
- The invention relates to a metal spool for receiving metallic winding material in the form of a wire, comprising two flanges in the form of circular disks, arranged parallel to one another and having the same diameter and an elongate core connecting these flanges and having a circular cross section and smaller radial dimensions in comparison with the flanges, the mid-axis of which core corresponds to the mid-axes of the flanges, in which spool a winding space for receiving the winding material is delimited by the core and the two flanges, and in which spool the distance between the flanges can be altered elastically by forces acting on them (DE 41 38 189 A1).
- These spools have long been known and available on the market. In the known technology, they are used for winding up metallic wires which are envisaged, in particular, as structural elements of electrical cables and lines. Spools in which the distance between the flanges can be altered are known. For example, DE 41 38 189 A1, mentioned at the outset, describes a spool in which transverse stresses occurring when spooling wire which is subjected to temperature are intended to be compensated for in a controlled manner. For this purpose, the flanges are arranged on the core such that they can move in the axial direction. Once the spooling has come to an end, the spool has its rated dimension owing to the displacement of the flanges towards the outside. DE 33 12 178 A1 describes a spool having a core comprising two parts, of which in each case one is attached to one flange. The parts of the core engage telescopically one inside the other and can be connected to one another by being latched in different relative positions for the purpose of setting different core lengths. A similar spool having a core comprising two parts is described in U.S. Pat. No. 3,840,198 A, in which the flanges are connected to one another via spring elements.
- In order to set specific properties for wires which are intended to be used in cables and lines as electrical conductors, it is necessary for them to be pretreated. In this case, the wires are provided with predetermined diameters by means of mechanical processing and, for example, bending properties which can be set in a targeted manner by thermal treatment. The thermal treatment takes place, for example, using so-called “annealing spools” consisting of metal, in particular of steel, onto which the wires are wound and, in the wound-on state, are subjected to an annealing treatment together with the spools. The required mechanical and electrical properties of the wires can thus be set with a sufficient degree of accuracy. However, problems often occur when withdrawing the wires, which have cooled down again after the annealing, from the spools since the wires can be “caked” to one another by the annealing process.
- The reason for this fact is essentially that the material of the wires provided for electrical applications expands to a greater extent on heating than the material of a spool consisting of a metal having a high tensile strength, in particular of steel. This applies, on the one hand, to copper, but in particular to aluminum, as the conductor material for the wires. In comparison with steel, aluminum has a coefficient of thermal expansion which is greater by a factor of approximately 2, while this factor is approximately 1.4 for copper in comparison with steel. The expansion of a wire which has been wound onto the spool with a large number of turns during heating in the annealing process is then drastically impeded by the respective spool. As a result, the turns of the wire not only push against the flanges of the spool, but they are also pushed against one another with a considerable amount of force. This results in the abovementioned caking of the wire turns.
- The invention is based on the object of designing the spool outlined at the outset such that caking of the wires during an annealing process can be ruled out with a high degree of reliability.
- This object is achieved in accordance with the invention by virtue of the fact that
-
- the dimensions of the winding space in the direction of the mid-axis of the spool can be enlarged at an increased temperature, in particular up to an annealing temperature required for annealing the winding material, in comparison with an initial position at room temperature by forces which are brought about by different coefficients of thermal expansion of the winding material, on the one hand, and of the core of the spool, on the other hand, and
- means are provided which can be used to bring the dimensions of the winding space back to the initial position when the temperature returns to room temperature.
- When using the spool according to the invention, caking of the turns of a wire wound onto said spool can be ruled out with a high degree of reliability. The core of the spool can, for example, itself be designed to be so elastic that, as a result of the heating during an annealing process, it is extended reversibly owing to the pressure exerted, for example, on the flanges of the spool when the wire turns expand. The individual wire turns can expand relatively unimpeded, however, in all embodiments of the spool during the annealing process owing to the expansion of the winding space, and the pressure exerted on these wire turns is as a result considerably reduced. The corresponding “extension distance” of the winding space is dependent on the level of the annealing temperature, of the coefficient of thermal expansion of the material for the wire wound on and of the size of the spool. It is, for example, between 2 mm and 10 mm.
- The elasticity of the core existing in the axial direction can be achieved by spring elements acting in the axial direction being incorporated, but with particular advantage owing to the use of a tube as the core, which tube is corrugated all the way around at least in an axial section transversely with respect to its axis, preferably over its entire length.
- Caking of the wire turns during an annealing process can also be ruled out with a high degree of reliability in another embodiment of the spool when the material of said spool has a coefficient of thermal expansion which corresponds at least approximately to that of the material for the wire wound onto the spool.
- Exemplary embodiments of the subject matter of the invention are illustrated in the drawings, in which:
-
FIG. 1 shows a view of a spool known in principle. - FIGS. 2 to 6 show different embodiments of the core of a spool according to the invention.
-
FIG. 7 shows a further embodiment of the spool according to the invention. -
FIG. 8 shows a section throughFIG. 7 along the line VIII-VIII. -
FIG. 9 shows a detail of the spool shown inFIG. 7 in an enlarged illustration. -
FIG. 10 shows a further embodiment of the spool. -
FIG. 11 is a graph of the displacement travel of the flanges over the length of the core at different temperatures. - The spool illustrated in
FIG. 1 has twoflanges flanges core 3, which likewise consists of metal and, in the exemplary embodiment illustrated, is cylindrical. Theelongate core 3 could also be conical. The mid-axes of theflanges core 3 correspond to one another. Awinding space 4 serving the purpose of receiving the winding material is delimited by theflanges core 3. - The spool according to the invention consists of metal and is used for receiving winding material in the form of wire, which is wound on with a large number of turns and likewise consists of metal—referred to below as “wire” for short. The upper part of
FIG. 1 shows a large number ofturns 5 of a wire. Its material should have a markedly greater coefficient of thermal expansion than the material for theflanges core 3. All parts of the spool therefore preferably consist of steel, and the wire is preferably a copper-cladded aluminum wire—referred to below as “CCA wire”, for short. The invention is naturally not restricted to the use of these materials. However, they are taken into consideration in the description below. - A spool which has been fully wound with CCA wire is introduced into an annealing furnace for an annealing treatment of the CCA wire and is heated there, for example, to temperatures of between 400° C. and 600° C. In the process, the
turns 5 of the CCA wire expand to a greater extent than the spool or itscore 3. In order that, as a result, theturns 5 of the CCA wire are not pressed too firmly against one another, the distance between theflanges winding space 4 can be altered in the direction of the mid-axis of the spool. - The displacement travel of the
flanges winding space 4 can be calculated, starting from a length at room temperature and subsequent return to the initial position at room temperature. The elements required for the reversible change in length can then have corresponding dimensions. The displacement travel of theflanges space 4 between room temperature and the increased temperature is equal to a length el in accordance with the following equation
el=l o1×Δδ(αw−αc),
in which:
lo1=length of the core at room temperature
Δδ=difference between the room temperature and the maximum temperature
αw=coefficient of thermal expansion of the material for the winding material
αc=coefficient of thermal expansion of the material for the core. - The dependence of the length el of the “displacement travel” on the level of the annealing temperature is shown, for example, in
FIG. 11 for an aluminum wire which has been wound onto a steel spool. A core having a length of 1000 mm is accordingly extended at a temperature of 200° C. by 2 mm, while the extension at 400° C. is approximately 4.8 mm, i.e. more than double that at 200° C. This effect is even more serious at a core length of 2000 mm. Here, the extension at 200° C. is approximately 3.8 mm and 9.5 mm at 400° C. The respective extension of the core, which is reversed when the wound spool is cooled to room temperature, is necessary, as mentioned above, in order that the wire turns do not cake to one another during annealing and subsequent cooling. The expansion of theflanges - The reversible enlargement of the winding
space 4 between the twoflanges core 3 can be achieved in a different way: - As shown in
FIG. 2 , thecore 3 may be in the form of atube 6, which is corrugated all the way round transversely with respect to its axis over its entire axial length. Since thecore 3 is fixedly connected to the twoflanges turns 5 of the CCA wire which are expanding and pressing against theflanges space 4 is increased. When the spool and the CCA wire are cooled, thecore 3 returns to its original length. - The same effect can be achieved when the core shown in
FIG. 3 is in the form of atube 7, which is corrugated all the way round transversely with respect to its axis at least in an axial section. - In the embodiment of the spool shown in
FIG. 4 , thecore 3 is fixedly connected to theflange 1 and connected to theflange 2 via aspring mechanism 8. Such a spring mechanism, however, can also be provided in each case between the twoflanges - As shown in
FIG. 5 , the core can also comprise twotubes spring mechanism 11. Thetube 9 is only fixedly connected to theflange 1, while thetube 10 is fixed to theflange 2. - In one further embodiment of the spool according to the invention, the core can also be designed such that there are no substantial measures for elastically changing its length. As shown in
FIG. 6 , thecore 12 may consist of aluminum and therefore substantially of the same material as the CCA wire. It therefore has at least approximately the same coefficient of thermal expansion as the CCA wire, with the result that the expression in parentheses in the above equation in the extreme case is equal to zero. With this design of the spool as well, no substantial pressure is applied to theturns 5 of the wire. This embodiment of the spool is generally designed such that the material of thecore 12 has at least approximately the same coefficient of thermal expansion as the material of the wire which has been wound on and is to be annealed. - One preferred embodiment of the spool is shown in FIGS. 7 to 9:
- As shown in
FIG. 7 , anintermediate flange 14 is mounted on acore 13 of the spool such that it can be displaced in the axial direction of the core 13, to be precise in the vicinity of theflange 2. Theintermediate flange 14 likewise consists, for example, of steel. It is connected to theflange 2 viasprings 15. As shown inFIG. 8 , preferably foursprings 15 are provided which are offset with respect to one another uniformly in the circumferential direction. For the guidance of theintermediate flange 14,bolts 16 are provided which are attached fixedly to theintermediate flange 14 and pass throughholes 17 in theflange 2, as is shown in a detail inFIG. 9 . As shown inFIG. 8 , fourbolts 16, which are offset with respect to one another in the circumferential direction, may be provided. They also prevent theintermediate flange 14 from tilting on the core 13 during displacement of said core. - In the spool shown in
FIG. 7 , the windingspace 4 is therefore delimited by theflange 1 and theintermediate flange 14. On expansion of theturns 5 of the wire wound onto the spool, theintermediate flange 14 moves in the direction of thestationary flange 2. Thesprings 15, which are pushed together in the process, move theintermediate flange 14 back into its initial position if the temperature returns to room temperature. The spool in the embodiment shown inFIG. 7 is particularly robust since theflanges core 13. - This also applies to the spool illustrated in
FIG. 10 , in which a displaceable intermediate flange 18 withsprings 19 and bolts 20, is attached to thecore 13, also in front of theflange 1. The same applies for the mode of operation of the intermediate flange 18 as for theintermediate flange 14.
Claims (11)
1. A metal spoool for receving metallic winding material in the form of a wire, comprising:
two flanges in the form of circular disks, arranged parallel to one another, and
an elongate core connecting said flanges and having a circular cross section a smaller radial dimension in comparison with radial dimensions of the flanges, the mid-axis of said core corresponding to mid-axes of the flanges, a winding space for recieving the winding material being delimited by the core and the two flanges, said flanges and core arranged so that the distance between the flanges can alterd elastically by forces acting on them, wherein
the dimensions of the winding space in the direction of the mid-axis of the spool can enlarged at an increased temperature, in comparsion with and initial position at room temperature by forces which are brought about by different coefficients of thermal expansion of the winding material, on the one hand, and of the core of the spool, on the other hand, and
means for bringing the dimensions of the winding space back to the initial position when the temperature returns to room temperature.
2. The spool as claimed in claim 1 , wherein the enlarging of the dimensions of the winding space between room temperature and the increased temperature is equal to a length el in accordance with the following equation
el=l o1×Δδ(αw−αc),
where the variables:
lo1=length of the core at room temperature
Δδ=difference between the room temperature and the increased temperature
αw=coefficient of thermal expansion of the material for the winding material
αc=coefficient of thermal expansion of the material for the core.
3. The spool as claimed in claim 2 , wherein the core is in the form of a tube, which is corrugated all the way round transversely with respect to its axis at least in one section of the tube.
4. The spool as claimed in claim 2 , wherein the core is attached fixedly to one flange of the spool and is connected to the other flange via a spring mechanism.
5. The spool as claimed in claim 2 , wherein the core comprises two tubes which are arranged concentrically with respect to one another and bear against one another and of which one is fixed to one flange and the other is fixed to the other flange and which are connected to one another by a spring mechanism which is effective in the axial direction.
6. The spool as claimed in claim 1 , wherein an intermediate flange is arranged in the winding space between the two flanges at least in the vicinity of one flange, which intermediate flange is mounted displaceably on the core and is connected to the flange in whose vicinity it is arranged via springs acting in the axial direction of the core.
7. The spool as claimed in claim 6 , wherein outwardly protruding bolts, which pass through holes in the associated flange, are attached to the intermediate flange in the axial direction of the core.
8. A metal spool for receiving metallic winding material in the form of a wire, comprising:
two flanges in the form of circular disks arranged parallel to one another, and
an elongate core connecting said flanges and having a circular cross section and a smaller radial dimension in comparison with radial dimensions of the flanges, the mid-axis of said core corresponding to mid-axes of the flanges, a winding space for receiving the winding material being delimited by the core and the two flanges, wherein the core comprises a material which has a coefficient of thermal expansion which is at least approximately the same as the material for the winding material.
9. The spool as claimed in claim 1 , wherein the core is in the form of a tube, which is corrugated all the way round transversely with respect to its axis at least in one section of the tube.
10. The spool as claimed in claim 1 , wherein the core is attached fixedly to one flange of the spool and is connected to the other flange via a spring mechanism.
11. The spool as claimed in claim 1 , wherein the core comprises two tubes which are arranged concentrically with respect to one another and bear against one another and of which one is fixed to one flange and the other is fixed to the other flange and which are connected to one another by a spring mechanism which is effective in the axial direction.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE102005060279 | 2005-12-16 | ||
DE102005060279.7 | 2005-12-16 |
Publications (1)
Publication Number | Publication Date |
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US20070138333A1 true US20070138333A1 (en) | 2007-06-21 |
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US11/641,595 Abandoned US20070138333A1 (en) | 2005-12-16 | 2006-12-18 | Metal spool |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2021032540A1 (en) * | 2019-08-19 | 2021-02-25 | Liebherr-Components Biberach Gmbh | Cable drum for a cable winch, and cable drive having such a cable drum |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3266748A (en) * | 1963-11-06 | 1966-08-16 | Le Bus Royalty Company | Expanding hoist drum |
US3840198A (en) * | 1972-08-09 | 1974-10-08 | J Moore | Spring-loaded expandable reel |
-
2006
- 2006-12-18 US US11/641,595 patent/US20070138333A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3266748A (en) * | 1963-11-06 | 1966-08-16 | Le Bus Royalty Company | Expanding hoist drum |
US3840198A (en) * | 1972-08-09 | 1974-10-08 | J Moore | Spring-loaded expandable reel |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2021032540A1 (en) * | 2019-08-19 | 2021-02-25 | Liebherr-Components Biberach Gmbh | Cable drum for a cable winch, and cable drive having such a cable drum |
CN114341047A (en) * | 2019-08-19 | 2022-04-12 | 利勃海尔比伯拉赫零部件有限公司 | Cable drum for a cable winch and cable drive having such a cable drum |
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Legal Events
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---|---|---|---|
AS | Assignment |
Owner name: ZIEMEK CABLE TECHNOLOGY GMBH, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ZIEMEK, GERHARD;REEL/FRAME:018925/0449 Effective date: 20070110 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |