GB2248602A - Tape cassette: reel support spring - Google Patents
Tape cassette: reel support spring Download PDFInfo
- Publication number
- GB2248602A GB2248602A GB9020119A GB9020119A GB2248602A GB 2248602 A GB2248602 A GB 2248602A GB 9020119 A GB9020119 A GB 9020119A GB 9020119 A GB9020119 A GB 9020119A GB 2248602 A GB2248602 A GB 2248602A
- Authority
- GB
- United Kingdom
- Prior art keywords
- support spring
- tape cassette
- video tape
- middle portion
- spring
- 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.)
- Withdrawn
Links
- 238000004049 embossing Methods 0.000 claims abstract description 7
- 238000005304 joining Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000002411 adverse Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004804 winding 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
- G11B23/04—Magazines; Cassettes for webs or filaments
- G11B23/08—Magazines; Cassettes for webs or filaments for housing webs or filaments having two distinct ends
- G11B23/087—Magazines; Cassettes for webs or filaments for housing webs or filaments having two distinct ends using two different reels or cores
- G11B23/08707—Details
- G11B23/08721—Brakes for tapes or tape reels
-
- 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
- G11B23/04—Magazines; Cassettes for webs or filaments
- G11B23/08—Magazines; Cassettes for webs or filaments for housing webs or filaments having two distinct ends
- G11B23/087—Magazines; Cassettes for webs or filaments for housing webs or filaments having two distinct ends using two different reels or cores
- G11B23/08707—Details
- G11B23/08728—Reels or cores; positioning of the reels in the cassette
Landscapes
- Springs (AREA)
Abstract
A support spring for reels in a video tape cassette has a pair of curved elastic end portions 3 to press the tape reels, a middle portion 4 having securing holes 5 and slots 6, embossings 7 formed in the portions 3, and a wider middle portion 4 resulting in projecting corners 8. <IMAGE>
Description
TITLE OF THE INVENTION
SUPPORT SPRING FOR VIDEO TAPE CASSETTE
FIELD OF THE INVEi#TION The present invention relates to a support spring used as a component of a video tape cassette, and particularly to a support. spring in which various embossings are formed on the elastic portions of the opposite end portions of the spring in order to reduce the width and thickness of the spring and to improve the elasticity of the spring, and in which the middle portion of the spring is designed to be large than the elastic portions of the spring in order to improve the supporting of the spring.
BACKGROUND OF THE INVENTION
Generally the support spring of a video tape cassette is one of the principal components of the cassette, and plays the role of pressing the two tapewinding reels at a constant pressure, so that, when the video tape is wound or unwound, the winding or unwinding state of the tape should be maintained at a constant condition. The support spring for use in a video tape cassette, which has the function as described above, takes the form of a flat spring, and if the thickness of it is kept at a fixed dimension, the scale of its elastic force becomes proportionate to the size of its width, while, if its width is kept constant, then the elastic force becomes proportionate to the thickness of the material of the spring.
Figure 1 illustrates one of the conventional support springs which have been developed and used based on the above described principle. Specifically, Figure 1A illustrates a lozengeshaped spring in which, if it is let to have an elasticity over a certain level, the width of its middle portion has to be increased, with the result that its bulk is destined to be increased, as well as causing a squandering of the material during the manufacturing, thereby causing te increase of the manufacturing cost. Figure iB illustrates a support spring having a narrower width compared with the support spring of Figure 1A, and tis support spring makes it possible to save the material cost.In this support spring, however, if it is to have an elastic force over the optimum level, its thickness has to be increased over that of Figure 1A1 thereby raking it difficult to put it to the practical use.
Besides the support springs described above, there is another support spring disclosed in Japanese
Utility Model Publication No. Sho-E2-83277. This support spring is constituted such that it is provided with securing holes at the opposite ends thereof, and a projection is formed between the two securing holes. When the support spring is secured through the securing holes, the gently curved portions of the opposite ends take the same form as that of the conventional ones, and the middle projection serves as an operationally supporting point. Therefore, if an elastic force over the optimum level is to be obtained, the problem that the thickness of the material has to be increased remains as before, thereby making it difficult to put it to the practical use.
Further, there are other support springs disclosed in Korean Utility Model Publication No. 85-l210 and No. 8?-609, and of them, the former is effective in saving the material cost, but it is difficult to obtain uniform elastic forces over the witole surface of the spring. Further, the elastic force is produced intensively along the diagonal lie between the two opposite ends, and this makes the support spring impractical. Meanwhile, the latter support spring has an opposite kind of disadvantage, i.e., the squandering of the material.
Generally, once a video tape cassette is completely manufactured, the video tape cassette itself has a semi-permanent life expectancy, while the support spring gradually loses the elastic forces with the elapsing of time. giving adverse influences to the operation of the video tape cassette, this being the common disadvantage of the conventional SUpport springs of video tape cassette.
SUMMARY C THE INVENTION
The present invention is intended to overcome the above described disadvantages of the conventional support springs for video tape cassette.
Therefore it is an object of the present invention to provide a support spring for video tape cassette, in whicn various embossings are formed on the opposite elastic portions, so that, even if the thickness of the spring is kept constant, and even if the width is narrowed, an elastic force more than the optimum level should be obtained, thereby making it possible to save the material cost and consequently the manufacturing cost.
rnt is another object of the present invention to provide a support spring for video tape cassette, in which the supporting portion of the spring is expanded, thereby improving the installability and the supporting function of the spring.
BRIEF DESCRIpTION OF THE DRAWINGS
The above objects and other advantages of the present invention will become more apparent by describing in detail the preferred embodiments of the present invent ion with reference to the attahed drawings in which:
Figure l is a plan view of conventional support
springs, showing a state with the support
spring installed wihtin the video tape
cassettes;
Figure 2 is a perspective view of the support spring
according to the present invention;
Figure 3 is an enlarged partly cut-out perspective
view of the portion A of Figure 2;
Figure 4 is a side view of the support spring
according to the present invention; and Figure 5 is a perspective view showing a state with
the support spring of the present invention
installed within a video tape cassette.
Ut;SCRlPTlON OF THE PREFERRED EMBODIMENT
As shown in Figures 2, 3 and 4, a support spring 2 of the present invention is constituted such that its oppasite ends are provided with gently curved elastic portions 3, 3 in order to press the tape reels installed within the cassette; a middle portion 4 is provided with a pair of securing holes 5, 5'; and the middle portion 4 is further provided with a pair of slots 6, 6' on the opposite side pdgPs thereof, these being the usual feature of a video tape cassette. The support spring 2 of the present invention is further constituted such that the elastic portions 3, 3' are provided with embossings 7, 7' having the shape of an elongate ellipse; and the middle portion 4 is laterally expanded so that each opposite corner ends 8, 8' of the middle portion 4 are projected in a rectangular an4tor gently rounded shape and should be stepped relative to the elastic portions 3, 3'.
By experirrents, it was found that the support spring of the present invention constituted as above gives a better elasticity over the conventional ones, even if its width is designed to be smaller than that of the conventional ones, with its thickness being kept equal to that of the conventional ones, and the experiment will be described below.
Generally, the testing of the elasticity of a support spring for video tape cassette is carried out in such a manner that, as if the sport spring is installed within the video tape cassette, the middle portion of the spring is secured on a testing apparatus, the ends of the elastic portions are pressed with a measuring gage, and the elasticity is measured in a state with the ends of the elastic portions separated from the testing apparatus by 3 mm.
The result of the testing was as follows. That is, in the case where the conventional support spring had a thickness of 0.3t and a riddle portion width of 13 mm, its elasticlity was found to be 180g + 2Og, while, in the case where the support spring according to the present invention had a thickness of 0.25t
(which is smaller than that of the conventionsi ones) and a middle portion width of 8.5 mm (which is smaller than that of the conventional ones by 4.5 mum) its elasticity was found to be 180 t 20g.
Figure illustrates a state in which the support spring 2 of the present invention is installed within a video tape cassette 1, and in this state, the opposite ends of the support spring 2 presses tape reels (not shown) with a constant elastic force.
Thus, according to the present invention, an elastic force over the optimum level can be obtained even with a smaller width and an equal thickness, and the reason lies in the fact that the embossings 7, 7 having the shape of an elongate ellipse are formed on the opposite elastic portions 3, 31 Further, the each opposite corner ends 8, 8' of the middle portions 4 are laterally projected relative to the elastic portions 3, 3', and therefore, when the spring is installed on the cassette 1, the securing area of the spring becomes larger, with the result that the support spring is more firmly and securely installed.This brings a further advantage such that, even after the support spring is pressed repeatedly by the reels for a long tine, there is produced a shear excluding effect in the joining portions between this middle portion and the elastic portions, thereby extending the life expectancy of the spring. Further, the spring of the present invention makes it possible to save the material cost and consequently the manufacturing cost.
In the above described embodiment, the embossings are formed in the shape of an elongate ellipse, but other shapes tnay also be used, this also being thought. to come within the scope of the present invention. Further, the difference between the widths of the middle portion and the elastic portions can be easily varied, and this also should be thought to come within the scope of the present invention.
Claims (5)
- What is claimed isA A support spring for video tape cassette, including: a pair of gently curved elastic portions provided in order to press tape reels installed within the video tape cassette; a middle portion joining with said elastic portions at its opposite ends; securing holes formed on said middle portion; and a pair of slots formed on the side edges of said middle portion, the improvement comprising: embossings formed on said elastic portions; and each opposite corner ends of said middle portion projected in a stepped form from said elastic portions.
- 2. The support spring for video tape cassette as claimed in claim 1, wherein said embossinos are disposed in the length direction of said elastic portions, and take the shape of an elongate ellipse.
- 3. The support spring for video tape cassette as claimed in claim 1, wherein said opposite corner ends of said middle portion are projected in the lateral direction and in a rectangular shape.
- 4. The support spring for video tape cassette as claimed in claim 1, wherein said opposite correr ends of said middle portion are projected in the lateral direction and in a gently rounded shape.
- 5. A support spring for video tape cassette substantially as hereinbefore described with reference to and as shown in Figures 2-5 of the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9020119A GB2248602A (en) | 1990-03-16 | 1990-09-14 | Tape cassette: reel support spring |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019900003540A KR930010869B1 (en) | 1989-03-16 | 1990-03-16 | Developing device used in an electrophotographic field |
| GB9020119A GB2248602A (en) | 1990-03-16 | 1990-09-14 | Tape cassette: reel support spring |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9020119D0 GB9020119D0 (en) | 1990-10-24 |
| GB2248602A true GB2248602A (en) | 1992-04-15 |
Family
ID=26297651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9020119A Withdrawn GB2248602A (en) | 1990-03-16 | 1990-09-14 | Tape cassette: reel support spring |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2248602A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2248054B (en) * | 1990-09-18 | 1994-07-27 | Youhan Electronics Co Ltd | A reel spring structure for a magnetic tape cassette |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2150115A (en) * | 1983-10-26 | 1985-06-26 | Basf Ag | Plate spring for a tape cassette and a tape cassette |
| GB2151583A (en) * | 1983-12-09 | 1985-07-24 | Basf Ag | Tape red pressure spring |
| GB2224676A (en) * | 1988-11-14 | 1990-05-16 | Jedmond Engineers Limited | Improvements in or relating to the manufacture of leaf springs |
-
1990
- 1990-09-14 GB GB9020119A patent/GB2248602A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2150115A (en) * | 1983-10-26 | 1985-06-26 | Basf Ag | Plate spring for a tape cassette and a tape cassette |
| GB2151583A (en) * | 1983-12-09 | 1985-07-24 | Basf Ag | Tape red pressure spring |
| GB2224676A (en) * | 1988-11-14 | 1990-05-16 | Jedmond Engineers Limited | Improvements in or relating to the manufacture of leaf springs |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2248054B (en) * | 1990-09-18 | 1994-07-27 | Youhan Electronics Co Ltd | A reel spring structure for a magnetic tape cassette |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9020119D0 (en) | 1990-10-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |