GB1598832A - Reel for magnetic recording tape - Google Patents
Reel for magnetic recording tape Download PDFInfo
- Publication number
- GB1598832A GB1598832A GB5418477A GB5418477A GB1598832A GB 1598832 A GB1598832 A GB 1598832A GB 5418477 A GB5418477 A GB 5418477A GB 5418477 A GB5418477 A GB 5418477A GB 1598832 A GB1598832 A GB 1598832A
- Authority
- GB
- United Kingdom
- Prior art keywords
- hub
- reel
- ring
- flange
- radially
- 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.)
- Expired
Links
- 239000000463 material Substances 0.000 claims description 29
- 229920003023 plastic Polymers 0.000 claims description 10
- 239000004033 plastic Substances 0.000 claims description 10
- 229920003002 synthetic resin Polymers 0.000 claims description 9
- 239000000057 synthetic resin Substances 0.000 claims description 9
- 238000009826 distribution Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 238000005452 bending Methods 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 230000013011 mating Effects 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims description 2
- 239000000543 intermediate Substances 0.000 claims 41
- 239000012765 fibrous filler Substances 0.000 claims 1
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 239000012634 fragment Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 229920000638 styrene acrylonitrile Polymers 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- SCUZVMOVTVSBLE-UHFFFAOYSA-N prop-2-enenitrile;styrene Chemical compound C=CC#N.C=CC1=CC=CC=C1 SCUZVMOVTVSBLE-UHFFFAOYSA-N 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
- G11B23/02—Containers; Storing means both adapted to cooperate with the recording or reproducing means
- G11B23/037—Single reels or spools
Landscapes
- Storage Of Web-Like Or Filamentary Materials (AREA)
Description
(54) REEL FOR MAGNETIC RECORDING TAPE
(71) We, MEMOREX CORPOR
ATION,a Corporation organized and existing under the laws of the State of California, United States of America, of San
Tomas at Central Expressway, Santa Clara,
California 95052, United States of America, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:
This invention relates to a tape reel and particularly to a reel for storing magnetic tape such as is used with computers.
Magnetic tape reels in the prior art have generally comprised either a metallic hub with spaced flanges attached thereto, or an all-plastic reel having both a plastics hub and plastics flanges attached thereto.
Prior art metallic hub reels have several disadvantages, the principal one being the high cost of manufacture, both in the material and labour costs. Additionally, the metal hubs have a substantially different coefficient of thermal expansion from that of the tape and may cause stretching of the tape if the tape and reel are exposed to low temperatures.
Such high costs of manufacture have been overcome to a large extent. by the use of synthetic resins or plastics for both the reel hub and its flanges. However, the prior art plastics reels have suffered numerous problems of their own. The primary problem of plastics reels has related to the inability of the plastics hub to withstand the compressive forces imparted to the hub by the wound tape. The requirement that all such reels have a standard groove provided for a recording lockout ring on one side has required an asymmetric design of the hub structure, with the reel having greater strength against compressive forces on the side opposite that having the lockout ring groove. This asymmetric design has thus resulted in an asymmetric distribution of the strength of the reel and its ability to resist deformation under load. Accordingly, when compressive forces are exerted upon the reel hub by the wound tape, especially at the higher tensions of newer tape drives, the reels have often tended to deform slightly in a 'coning' manner. Even slight deformation of this nature causes the tape to tend to wind in a conical manner, bearing against one of the flanges, instead of winding squarely outwardly from the hub. Such conical winding tends to impart great stresses to the flange, frequently causing its fracture from the hub and possibly causing destruction of the tape wound thereupon.
Accordingly, it is an aim of this invention to provide a tape reel which resists axially uneven compressive deformation. More particularly, it is an aim of this invention to provide a reel having a stiffness or resistance to deformation which is generally equally distributed on opposite sides of a plane normal to the reel axis and passing through the axial center of the reel. It is a further aim of this invention to provide such a reel which is economical to manufacture and in which both the hub and the flanges are associated therewith are moulded of synthetic resin material.
Accordingly in one aspect the present invention provides a reel for magnetic recording tape, such reel having axially opposed first and second - sides and comprising,
a hub including axially extending coaxial inner and outer rims joined by a web extending radially therebetween and a coaxial ring on each side of the web extending axially outwardly of the web, intermediate the inner and outer rims,
a pair of opposed flanges attached to and extending radially outwardly of the hub intermediate rings with a first flange received on a first axial side of the hub corresponding to the reel first side, and a second flange received on the second, opposed axial side of the hub corresponding to the reel second side, each flange including hub support means cooperating with its respectively adjacent intermediate ring and the hub outer rim to assist the hub outer rim in resisting radially inward deflection, and a lockout ring groove formed in the reel second side radially outward of the hub inner rim.
In another aspect the present invention provides a reel as claimed in Claim 3, further comprising a plurality of outer ribs extending radially between the hub outer rim and the hub intermediate rings on both sides of the hub, whereby the outer ribs may serve to carry a portion of any radially deforming forces on the hub outer rim to the hub intermediate rings for support.
In yet another aspect the present invention provides a reel as claimed in any of claims 11 to 19, wherein the hub is formed of a material of higher strength than the material forming the flanges.
The present invention is further illustrated in the accompanying drawings, in which:
Figure I is a perspective view, partially in section, of the reel of this invention, illustrating the side of the reel which would be facing outwardly when the reel is mounted on a tape drive:
Figure 2 is a fragmentary perspective view in section of the reel of Figure 1, illustrating the opposite, inwardly facing side thereof;
Figure 3 is a fragmentary sectional view of a portion of the hub and flanges of the reel of this invention;
Figure 4 is an exploded view of a fragment of the reel of this invention, viewed from the outwardly facing side thereof.
Figure 5 is an exploded view of a fragment of the reel of this invention, illustrating the inwardly facing side thereof; and
Figure 6 is a fragmentary sectional view of the reel of this invention, taken along line 6-6 of Figure 3.
Description of a Preferred embodiment.
A preferred embodiment of the reel is illustrated in Figure 1 and comprises three basic components, a hub 2, a front or first flange 4, and a rear or second flange 6.
Suitably, both flanges 4 and 6 may be moulded of a synthetic resin such as styrene.
For additional strength it is desirable that the hub 2 be moulded of a higher strength material than the flanges, suitably a filled synthetic resin such as glass-filled styrene or glass-filled styrene-acrylonitrile, commonly referred to as SAN. This higher strength hub material assists in resisting the radially inward forces exerted by tape wound upon the hub.
The manner of construction and detailed configuration of the reel components is best illustrated in the enlarged sectional view of
Figure 3. In this view it can be seen that the hub 2 comprises a coaxial inner rim 8, which engages the tape drive spindle, and a coaxial outer rim 10, upon which the tape is wound, are joined together by a web 12 which extends radially between the two rims.
Projecting axially from opposite sides of the web 12 are first side ring 14 and second side ring 16 which are intermediate of the rims and which are coaxial with the rims 8 and 10 and thus with the reel itself. Extending between the outer rim 10 and the intermediate ring 14 and between the outer rim 10 and the intermediate ring 16 are a plurality of hub outer ribs 18 and 20, also illustrated in
Figures 4 to 6. By the use of this ribbed construction instead of heavy solid sections for the hub, the outer rim section 10 of the hub may be kept thin enough in section to avoid any sinking or distortion problems normally encountered with thick sections.
Further to avoid thick sections it may be noted in Figures 4 and 5 that the ribs 18 and 20 are angularly positional preferably in a staggered arrangement, so that no outer ribs 18 and 20 directly oppose one another. As shown on the first side i.e. the first or outside of the reel when mounted on a tape drive the hub first side outer ribs 18 are aligned with radially extending inner ribs 21 which join intermediate ring 14 with inner rim 8. By this ribbed construction radially compressive forces acting upon outer rim 10 may be transmitted directly to the intermediate rings 14 and 16, and any such loads on first side intermediate ring 14 may be transmitted directly to the inner rim 8 for further support. As is best indicated in
Figures 4 and 6, a plurality of auxiliary inner ribs 22 also extend radially between first side intermediate ring 14 and inner rim 8.
These auxiliary ribs 22 are positioned such that one such rib is located between each adjacent pair of inner ribs 21. Due to the industry standard requirement that a recording lockout ring groove be provided on the side of the reel facing the tape drive, no corresponding ribs extend between second side intermediate ring 16 and the inner rim 8.
The opposed flanges 4 and 6 are best illustrated with reference to Figures 3 to 5.
These flanges are generally annular disc-like members attached to the hub 2. Each flange includes flange ring means preferably in the form of a pair of coaxial rings extending axially inwardly of the reel with the radially outer ring defining the first portion of he flange ring means and the radially inner ring defining a second portion of the flange ring means. On the front or first flange 4, the radially outer and inner such rings are denoted respectively by reference numbers 24 and 26; on rear or second flange 6 the corresponding rings are denoted by reference numbers 28 and 30. The outer ring of each flange 4, 6 engages the radially inner part of the outer rim of the hub 2, while the other ring thereof engages the radially inner part of the intermediate ring 14. From
Figures 4 and 5, it may be seen that flange rings 24 and 28 are slotted to straddle hub ribs 18 and 20, respectively. Additionally, flange ring 26 is slotted to straddle both inner ribs 21 and auxiliary ribs 22. By this straddling engagement between the slotted flange rings and the hub ribs a positive means of torque transmission between the hub 2 and the respective flanges 4 and 6 is provided. The engagement between the ribs on the first side of the hub and the slotted flange rings on the first flange 4 may also be seen in the sectional view of Figure 6.
While any suitable method, such as adhesive bonding, for attaching the flanges 4 and 6 to the hub 2 may be used, it is preferred to attach the flanges to the hub by means of ultrasonic weldments. To provide for these weldments, angled fillets 34, 36, 38, and 40 are provided on the radially inward facing portions of outer rim 10 and intermediate rings 14 and 16, as best illustrated in Figure 3. Prior to assembly and such ultrasonic welding the axially innermost portions of flange rings 24, 26, 28, and 30 are generally squared-off, as indicated by the dotted lines in Figure 3. However, during the ultrasonic welding process those squared portions are melted to form a bond between the flange rings 24, 26, 28, and 30 and the corresponding angled fillets 34, 36, 38 and 40, as illustrated in Figure 3. If desired, the rib straddling arrangement of the slotted flange rings could also provide an increased area for sonic welding. It may be noted that the axially inward facing portions of each flange 4 and 6 also include, on a portion of the flange adjacent and radially outward of the respective outer rings 24 and 28, circular grooves 42 and 44 for receiving the corresponding portions of the hub outer rim 10 as shown in Figure 3.
From the above description it may be seen that, upon assembly of the flanges to the hub, the flange rings 24, 26, 28, and 30 provide additional support against com
pressive deformation of the hub outer rim
10 and the hub intermediate rings 14 and 16.
By virtue of this engagement any radially
compressive deformation of those hub por
tions would require a corresponding com
pressive deformation of the immediately
adjacent flange rings. Additionally, the in
tegral formation of the flange rings on the
flanges 4 and 6 provides for transfer and
distribution of any such load to other
adjacent portions of the flange, thus provid
ing further improved support to the hub outer rim 10. As noted above, a primary problem of all plastics reels such as this relates to the combination of compressive forces exerted upon the hub outer rim by the tape and the requirement that a lockout ring groove be provided adjacent the inner rim 8 of the hub. In the present reel this groove is defined by the radially outward facing portion of hub inner rim 8, a portion of hub web 12 and the radially inward facing portion of second flange inner ring 30. The requirement that such a groove be provided in the reel precludes the placing of strengthening ribs between the hub intermediate ring 16 and the inner rim 8 on the second side of the reel. Desirably, to avoid warping of the reel the strength of the reel and its resistance to deformation under such compressive forces from the tape wound thereupon should be distributed essentially symmetrically about a plane normal to the reel axis and disposed axially centrally of the reel. The location of such an axially central plane is indicated on Figure 3 by the chain-dotted line 46.
In conventional prior art reels the requirement of the provision of the lockout ring groove has generally caused the stiffness or resistance to compressive deformation of the reel to be distributed asymmetrically of this axially central plane. This uneven distribution has often resulted in the reel deforming in a generally conical manner under conditions of repetitive loading of tightly wound recording tape. In the reel of this invention, however, this problem has been solved by the creation of a generally balanced design.
From the foregoing it is recognized that the basic problem faced in the reel of this invention is the absence of any hub ribs or hub material in the lockout ring groove to balance the stiffness and strength imparted by the inner ribs 21 and auxiliary inner ribs 22 extending from the intermediate ring 14 to the hub inner rim 8 on the opposite, first side of the hub. Thus, a means should be provided to supply corresponding support against the radially compressive forces exerted upon the hub outer rim 10 and carried by ribs 20 to the intermediate ring 16 on the second side of the hub. There is no problem of asymmetrical hub stiffness radially outwardly of intermediate rings 16, since the provision of ribs 18 and 20 on both sides of the hub render the stiffness and resistance to deformation of that portion of the hub substantially symmetrical about the axially central plane 46. Thus, the portions of the hub radially outward of intermediate ring 16 are of substantially equal thickness and generally symmetrical configuration on both sides of the axially central plane 46.
To maintain the generally symmetrical distribution of stiffness and strength radially inward of intermediate ring 16, the bulk of the material in the hub web 12 is displaced axially of the central plane 46 toward the lockout ring groove. This displacement of the web material is intended to compensate by the location and thickness of the web for the absence in the lockout ring groove of any ribs corresponding to extended ribs 18.
Additional considerations then dictate the preferred location and configuration of the hub and flange rings. As stated above, the flange rings are located radially inward of their mating portions on the hub rim and intermediate rings, to resist compressive deformation of those hub portions. This configuration also increases the moment arm resisting outward bending and deflection of the flanges, to provide additional strength to those members. To maximize these benefits it is desirable to have the radially inner and radially outer rings of each flange spaced well apart, as is provided on flange 4. However, the lockout ring groove prevents this wide spacing for the rings of second flange 6. Thus, the second intermediate ring 16 of the hub is necessarily displaced radially outward from the location of the first intermediate ring 14. To strengthen the second side of the reel with the lockout ring groove, against compressive deformation, the radially inner second flange ring 30 is formed of a thicker section than its counterpart inner ring 26 of first flange 4. To further balance the strength and stiffness of the two sides of the reel, the weaker first flange material of innermost flange ring 26 (instead of the stronger hub material) is located opposite the lockout ring groove. This necessitates the placement of the first side intermediate ring 14 opposite the innermost ring 30 of the second flange 6, and thus further militates for the staggered placement of the opposing intermediate rings 14 and 16 of the hub. Another benefit of the radially offset intermediate rings of the hub is the avoidance of undesirably thick plastics sections that might cause warpage or sinking during the moulding process. From an analysis of relative mate
rial strengths and volumes and moment
arms it will be seen that this preferred configuration provides the desired control and balancing of the stiffness and resistance to deformation of the reel that is desirable to resist asymmetrical deformation and dis
tortion of the reel. Thus, the reel of this
invention overcomes the problem of the
asymmetrical distribution of strength and
resistance to deformation commonly found
in the prior art reels, while remaining
relatively simple and economical to manu
facture.
WHAT WE CLAIM IS:
1. A reel for magnetic recording tape,
such reel having axially opposed first and second sides and comprising,
a hub including axially extending coaxial inner and outer rims joined by a web extending radially therebetween and a coaxial ring on each side of the web exending axially outwardly of the web, intermediate the inner and outer rims,
a pair of opposed flanges attached to and extending radially outwardly of the hub intermediate rings with a first flange received on a first axial side of the hub corresponding to the reel first side, and a second flange received on the second, opposed axial side of the hub corresponding to the reel second side, each flange including hub support means cooperating with its respectively adjacent intermediate ring and the hub outer rim to assist the hub outer rim in resisting radially inward deflection, and a lockout ring groove formed in the reel second side radially outward of the hub inner rim.
2. A reel as claimed in Claim 1, further comprising means for balancing the resistance of the reel outer rim against radially compressive deformation generally equally on either side of a plane which is normal to the reel axis and disposed axially centrally of the reel, whereby any radially compressive deformation caused by tape wound upon the outer rim of the reel is maintained generally equal on either side of that plane.
3. A reel as claimed in Claim 2, wherein the deformation resisting balancing means comprises, in combination, a plurality of inner ribs extending radially between the hub inner rim and the intermediate ring on the hub first side, and the provision of a greater thickness of the hub web on the axially central plane second side than on the plane first side, whereby the thickened web may compensate in strength and resistance to deformation for the absence of supporting hub material in the lockout ring groove on the reel second side so that the thickened web and hub inner ribs may cooperate with the hub intermediate rings and the hub support means on the flanges to balance generally the resistance of the hub against radially compressive deformation on either side of the axially central plane.
4. A reel as claimed in Claim 3, further comprising a plurality of outer ribs extending radially between the hub outer rim and the hub intermediate rings on both sides of the hub, whereby the outer ribs may serve to carry a portion of any radially deforming forces on the hub outer rim to the hub intermediate rings for support.
5. A reel as claimed in Claim 4, wherein the hub support means on each flange comprises flange ring means extending axially inwardly of the reel, with a first portion of each flange ring means engaging the hub outer rim and a second portion of
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (27)
1. A reel for magnetic recording tape,
such reel having axially opposed first and second sides and comprising,
a hub including axially extending coaxial inner and outer rims joined by a web extending radially therebetween and a coaxial ring on each side of the web exending axially outwardly of the web, intermediate the inner and outer rims,
a pair of opposed flanges attached to and extending radially outwardly of the hub intermediate rings with a first flange received on a first axial side of the hub corresponding to the reel first side, and a second flange received on the second, opposed axial side of the hub corresponding to the reel second side, each flange including hub support means cooperating with its respectively adjacent intermediate ring and the hub outer rim to assist the hub outer rim in resisting radially inward deflection, and a lockout ring groove formed in the reel second side radially outward of the hub inner rim.
2. A reel as claimed in Claim 1, further comprising means for balancing the resistance of the reel outer rim against radially compressive deformation generally equally on either side of a plane which is normal to the reel axis and disposed axially centrally of the reel, whereby any radially compressive deformation caused by tape wound upon the outer rim of the reel is maintained generally equal on either side of that plane.
3. A reel as claimed in Claim 2, wherein the deformation resisting balancing means comprises, in combination, a plurality of inner ribs extending radially between the hub inner rim and the intermediate ring on the hub first side, and the provision of a greater thickness of the hub web on the axially central plane second side than on the plane first side, whereby the thickened web may compensate in strength and resistance to deformation for the absence of supporting hub material in the lockout ring groove on the reel second side so that the thickened web and hub inner ribs may cooperate with the hub intermediate rings and the hub support means on the flanges to balance generally the resistance of the hub against radially compressive deformation on either side of the axially central plane.
4. A reel as claimed in Claim 3, further comprising a plurality of outer ribs extending radially between the hub outer rim and the hub intermediate rings on both sides of the hub, whereby the outer ribs may serve to carry a portion of any radially deforming forces on the hub outer rim to the hub intermediate rings for support.
5. A reel as claimed in Claim 4, wherein the hub support means on each flange comprises flange ring means extending axially inwardly of the reel, with a first portion of each flange ring means engaging the hub outer rim and a second portion of
each flange ring means engaging its respectively adjacent hub intermediate ring.
6. A reel as claimed in Claim 5, wherein the flange ring means comprises a pair of coaxial rings with the flange ring means first portion comprising the radially outer flange ring and the flange ring means second portion comprising the radially inner flange ring, the outer flange ring being slotted to straddle hub outer ribs, whereby torque may be transmitted from the hub to the flanges by the engagement of the outer ribs and the outer flange ring slots.
7. A reel as claimed in Claim 1, further comprising a plurality of inner ribs extending radially between the hub inner rim and the hub intermediate ring on a first side of the hub, whereby a portion of any radial deforming forces acting on the hub outer rim and carried to the intermediate ring may be carried through to the hub inner rim.
8. A reel as claimed in Claim 7, further comprising a plurality of outer ribs extending radially between the hub outer rim and the hub intermediate rings on both sides of the hub, whereby the outer ribs may serve to carry a portion of any radially deforming forces on the outer rim to the intermediate rings for support.
9. A reel as claimed in Claim 7, wherein the hub web between a second side intermediate ring and the hub inner rim is of greater thickness on the second side of a plane which is normal to the reel axis and disposed axially centrally of the reel than on the first side of the plane, whereby the thickened web may compensate in strength for the absence of supporting hub material and ribs in the lockout ring groove on the reel second side to resist deflection under load.
10. A reel as claimed in Claim 9, wherein the portion of the hub web radially outward of the hub second side intermediate ring is of substantially equal thickness on either side of the axially central plane.
11. A reel for magnetic recording tape, comprising a hub including axially extending coaxial inner and outer rims joined by a radially extending web, and a coaxial ring intermediate the rims on each side of the web extending axially outwardly of the web, each rim and each ring having radially inward and radially outward portions,
a pair of opposed flanges attached to and extending radially outwardly of the hub with a first flange received on a first axial side of the hub, corresponding to a first axial side of the reel and a second flange received on the second, opposed axial side of the hub corresponding to the second, opposed axial side of the reel. each flange having a pair of coaxial rings extending axially inwardly of the reel with the radially outer flange ring on each flange being received against the corresponding radially inward portion of the outer rim, and the radially inner flange ring on each flange being received against the radially inward portion of the corresponding intermediate ring, whereby the flange rings serve to support their adjacent respective hub outer rim and intermediate ring portions against radially inward deflection, and
a lockout ring groove formed in the reel second side between the hub inner rim and the second flange inner ring.
12. A reel as claimed in Claim 11, further comprising a plurality of outer ribs extending radially between the hub out rim and the intermediate rings on both sides of the hub, whereby the hub outer ribs serve to carry a portion of any radially deforming forces on the outer rim to the intermediate rings for support.
13. A reel as claimed in Claim 12, wherein the radially outer flange rings are slotted to straddle the hub outer ribs, whereby torque may be transmitted from the hub to the flanges by the engagement of the ribs and the ring slots.
14. A reel as claimed in Claim 12 or 13, further comprising a plurality of radially extending inner ribs extending between the intermediate ring and the inner rim on the first side of the reel, whereby a portion of any radially deforming forces acting on the hub outer rim or first side intermediate ring may be carried through to the inner rim for support thereby.
15. A reel as claimed in Claim 14, further comprising auxiliary inner ribs extending radially between the hub first side intermediate ring and the inner rim and positioned between the adjacent extended hub inner ribs.
16. A reel as claimed in Claim 15, wherein the outer rings of the first and second flanges are slotted to straddle the hub outer ribs, and the inner ring of the first flange is slotted to straddle both the extending hub inner ribs and the auxiliary inner ribs.
17. A reel as claimed in Claim 14, wherein the portion of the hub web between the second side intermediate ring and the hub inner rim is of greater thickness on the second side of a plane which is normal to the reel axis and disposed axially centrally of the reel than on the first side of the plane, whereby the thickened web may compensate in strength for the absence of supporting hub material and inner ribs in the lockout ring groove on the reel second side to resist deflection under load.
18. A reel as claimed in Claim 17, wherein the portion of the hub web radially outward of the hub second side intermediate ring is of substantially equal thickness on either side of the axially central plane.
19. A reel as claimed in any of Claims 11 to 18, wherein the hub second side interme diate ring is offset radially outward of the hub first side intermediate ring such that the hub first side intermediate ring is disposed generally opposite the second flange inner nng, and the first flange inner ring is disposed generally opposite a portion of the lockout ring groove, whereby the resistance of the reel to radial deformation from the stresses of tape wound thereupon may be made substantially equal on either side of the axially central plane.
20. A reel as claimed in any of Claims 11 to 19, wherein the hub is formed of a material of higher strength than the material forming the flanges.
21. A reel as claimed in Claim 20, wherein the flange material comprises a synthetic resin and the hub material comprises a synthetic resin having a generally fibrous filler.
22. A reel as claimed in Claim 21, wherein the hub material comprises a glassfilled synthetic resin.
23. A reel as claimed in any of Claims 11 to 22, wherein the second flange inner ring is of greater thickness than the hub first side intermediate ring, whereby the greater thickness of the flange ring may offset the greater strength of the material of that opposed intermediate ring.
24. A reel as claimed in any of Claims 11 to 23, wherein the flanges are attached to the hub by ultrasonic weldments.
25. A reel as claimed in any of Claims 11 to 24, wherein the axially inwardly facing portion of each flange includes, on the portion of the flange adjacent and radially outward of the outer ring, a circular groove for receiving the corresponding portion of the hub outer rim.
26. A reel for magnetic recording tape, such reel having axially opposed first and second sides and comprising,
a hub formed of synthetic resin material having opposed first and second sides corresponding to the reel first and second sides and including,
axially extending coaxial inner and outer rims joined by a radially extending web,
a pair of coaxial rings intermediate the inner and outer rims, one intermediate ring extending axially outward of each side of the web,
the portion of the hub web between the second side intermediate ring and the hub inner rim being of greater thickness on the second side of a plane which is normal to the reel axis and disposed centrally of the reel than on the first side of the plane,
a plurality of ribs extending radially between the hub outer rim and the hub inner rim on the hub first side, and
a plurality of ribs extending radially between the hub outer rim and the hub intermediate ring on the hub second side;
a pair of opposed flanges, formed of synthetic resin material, attached to the hub first and second sides, respectively, and extending radially outward of the hub, each flange having a pair of coaxial rings extending axially inward of the reel, the radially outer flange ring on each flange being received against the corresponding radially inward portion of the hub outer rim and the radially inner flange ring on each flange being received against the radially inward portion of the corresponding intermediate ring, the radially outer ring on each flange being slotted to straddle the hub ribs, whereby torque may be transmitted from the hub to the flanges by the engagement of the ribs and the ring slots; and
a lockout ring groove formed in the reel second side between the radially outer portion of the hub inner rim and the radially inner portion of the second flange inner ring.
27. A reel for magnetic recording tape substantially as herein described and with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5418477A GB1598832A (en) | 1977-12-29 | 1977-12-29 | Reel for magnetic recording tape |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5418477A GB1598832A (en) | 1977-12-29 | 1977-12-29 | Reel for magnetic recording tape |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1598832A true GB1598832A (en) | 1981-09-23 |
Family
ID=10470198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5418477A Expired GB1598832A (en) | 1977-12-29 | 1977-12-29 | Reel for magnetic recording tape |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1598832A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0120467A2 (en) * | 1983-03-29 | 1984-10-03 | BASF Aktiengesellschaft | Tape reel for a magnetic tape |
-
1977
- 1977-12-29 GB GB5418477A patent/GB1598832A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0120467A2 (en) * | 1983-03-29 | 1984-10-03 | BASF Aktiengesellschaft | Tape reel for a magnetic tape |
| EP0120467A3 (en) * | 1983-03-29 | 1985-11-06 | Basf Aktiengesellschaft | Tape reel, in particular for a magnetic tape |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |