CA2050369A1 - Dust door incorporating tape reel lock - Google Patents
Dust door incorporating tape reel lockInfo
- Publication number
- CA2050369A1 CA2050369A1 CA002050369A CA2050369A CA2050369A1 CA 2050369 A1 CA2050369 A1 CA 2050369A1 CA 002050369 A CA002050369 A CA 002050369A CA 2050369 A CA2050369 A CA 2050369A CA 2050369 A1 CA2050369 A1 CA 2050369A1
- Authority
- CA
- Canada
- Prior art keywords
- tape
- cassette
- dust door
- closed position
- reel
- 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.)
- Abandoned
Links
- 239000000428 dust Substances 0.000 title claims abstract description 46
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 241000905957 Channa melasoma Species 0.000 description 1
- 101150039033 Eci2 gene Proteins 0.000 description 1
- 102100021823 Enoyl-CoA delta isomerase 2 Human genes 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002994 raw material Substances 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
- G11B23/08735—Covers
- G11B23/08742—Covers in combination with brake means
Landscapes
- Packaging Of Annular Or Rod-Shaped Articles, Wearing Apparel, Cassettes, Or The Like (AREA)
- Impression-Transfer Materials And Handling Thereof (AREA)
- Storage Of Web-Like Or Filamentary Materials (AREA)
Abstract
ABSTRACT
A pivotable, spring loaded dust door movable between a first, closed position and a second, open position and including a pair of integrally formed projections. The projections extend, when the dust door is in the closed position, through openings formed in a front edge of the cassette cover and engage teeth formed on the circumference of the tape reel upper flanges.
A pivotable, spring loaded dust door movable between a first, closed position and a second, open position and including a pair of integrally formed projections. The projections extend, when the dust door is in the closed position, through openings formed in a front edge of the cassette cover and engage teeth formed on the circumference of the tape reel upper flanges.
Description
~3 i3 ~
S PECI FI CATIQN
BACKGROUND OF THE INVENTION
This invention relates to tape cassettes and, more particularly, to a tape reel lock formed on a video tape cassette dust door for preventing despooling of tape from the reels, when the cassette is not received by a tape player/recorder.
For convenience of reference, when describing the tape cassette herein, "inward" means in a direction toward to the interior of the cassette from its sides, I'outward'' means in a dire~tion toward the sides o~ the cassette from the interior, and "downward" means in a directiGn toward the base from the cov~r.
A convenkional tape cassette has a relatively flat, substantially rectangular configuration, ~ormed of a suitable plastic. The cassette includes a base and cover, each having side walls. Tape reels are usually suitably located in side-by-side relation within the cassette so as to be freely rotatable, and a magnetic tape is wound on the tape reels.
A reel leaf spring is attached to the cassette cover to normally bias the tape reels downwardly~
These càssettes further include a pivotable, spring biased dust door which, when closed, protects the tape from dust, contact, etc. When the door is outwardly opened, usually by a tape player/recorder when the cassette is placed -- 1 ~
S PECI FI CATIQN
BACKGROUND OF THE INVENTION
This invention relates to tape cassettes and, more particularly, to a tape reel lock formed on a video tape cassette dust door for preventing despooling of tape from the reels, when the cassette is not received by a tape player/recorder.
For convenience of reference, when describing the tape cassette herein, "inward" means in a direction toward to the interior of the cassette from its sides, I'outward'' means in a dire~tion toward the sides o~ the cassette from the interior, and "downward" means in a directiGn toward the base from the cov~r.
A convenkional tape cassette has a relatively flat, substantially rectangular configuration, ~ormed of a suitable plastic. The cassette includes a base and cover, each having side walls. Tape reels are usually suitably located in side-by-side relation within the cassette so as to be freely rotatable, and a magnetic tape is wound on the tape reels.
A reel leaf spring is attached to the cassette cover to normally bias the tape reels downwardly~
These càssettes further include a pivotable, spring biased dust door which, when closed, protects the tape from dust, contact, etc. When the door is outwardly opened, usually by a tape player/recorder when the cassette is placed -- 1 ~
2 ~ ~;t '~
therein, the magnetic head o~ the player/recorder can gain access to the tape.
Video tape cassettes also include tape reel locks to prevent unwanted tape reel rotation which causes "despooling"
of the tape during shipping, handling, etc. Despooled, tape, of course, can be damaged.
As a tape reel lock, the industry has almost uniformly adopted a multipieca reel lock, such as shown and described in U.S. Patent Nos. 4,447,020 or 4,232,840~ Such mul~ipiece reel locks include a separate actuator/retractorJ a pair of separate ~ovable arms for respectively locking the reels, and a separate spring for biasing the arms toward the reels.
These reel locks are assembled between the tape reels in walls/receptacles formed at the rear of the cassette base and are actuated by a pin of the tape player/recorder that protrudes through an opening formed at the rear vf the base, when the player/recorder is operated.
Of course, such a multipiece lock is expensive to produce and assemble. Further, due to the number o~ parts and the fabrication requirements for each part, production yields cannot be maximized. Finally, there is always the chance that the parts, such as the spring, could become misaligned during shipping, handling or use, and fail to properly operate, Assignee's currently pending U.S. Patent Application Serial No. 389,906, entitled "Video Cassette Integral Actuator/Reel Lock Sprin~" provides an improved one-piece, ~ ~J ~)3 ~ ~
biased reel lock to replace the conventional multipiece reel lock, significantly decreasing manu~acturing and assembly cost~.
There is also known a sliding locking member for certain S audio cassettes, such as described in U.S. Patent No.
4,728,056. More particularly, a substantially planar locking member is spring biased for normally urging protrusions formed inwardly thereon against the tape reel hubs. When the cassette is placed in a tape player/recorder, the locking member ic retracted by the tape player/recorder, to remove the protrusions from engagement with the hubs and allow the hubs to rotate.
This type of device also suffers ~rom manufacturing inefficiencies since the locking member must be spring loaded.
Further, this type of device may be applicable only to a cassette used in a pulse code modulation system, as described in the '056 patent. Finally, the size, shape and sliding movement of thè locking member do not provide much design flexibility for tape cassettes.
As can be seen, the art still is in need of a reel lock which needs no asse~bly and reguires no moving parts or springs, to further simplify structure, improve quality and reliability, and minimize costs.
8UMMARY OF ~ INV~NT~ON
Accordingly, it is a purpose of the present invention to provide a tape cassette which can be made at less cost.
` ' ' .
2 ~ c~ ~ 3 ~ ~
It is another purpose o~ the present invention to provide a tape cassette requiring fewer parts than conventional tape cassettes.
It is another purpose of the present invention to provide a reel lock re~uiring no assembly o~ parts into a video cassette or separate biased mounting.
It is another purpose o~ the present invention to provide a reel lock which is incorporated with another member already existing in the tape cassette for another purpose.
It is another purpose of the present invention to provide a video cassette reel lock which lacks moving or working parts, except cooperation between the reels and the dust door, to improve reliability.
Finally, it is a purpose of the present invention to provide a reel lock projecting inwardly from the dust door to cooperate with the tape reels and thereby prevent despooling o~ the tape, when the cassette is not received by the tape p~ayer/recorder.
To achieve the foregoing and other purposes of the present invention, and in accordance with the purposes of the invention there is provided a pivotable, spring-biased dust door movable between a first, closed position and a second, open position. The dust door has formed inwardly thereon a pair of spaced projections. The proiections extend, when the dust door is in the second, closed position, through corresponding openings formed in a front edge of the cassette 3 ~ .~
cover and engage teeth formed on the circumference of each tape reel upper flange. When the dust door is moved from the first, closed position to the second, open position, the projections disengage from the tape reel flanges, thereby S allowing the tape reels to rotate freely for operation.
Other features and advantages of the present invention will be appaxent from the following description taken in conjunction with the accompanying drawings, in which like reference characters designate the same or similar parts throughout the figures thereof.
~RIEF 32E~CRIP~!ION_O~F_T~I~5 D~AWI~G~
The accompanying drawings, which are incorporat,ed in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the in~ention.
FIG. 1 is a top view of the top cassette according to the present invention illustrating reel locks which are formed on the dust door and engaged with the tape reel flanges.
FIG. 2 is a side, cross-sectional view, taken along line 2 - 2 of FIG. 1, of one of the reel looks engaged with circumferential teeth of a tape reel upper flange, when the dust door is`~n the first, closed position.
FIG. 3 is a side, cross-sectional view of one of the reel locks disengaged from the teeth on the tape reel upper flange circumference, when the dust door is in the second, open position.
~J ~ 3 DE8CRIP~ION QF_~E PREFERREP E~BODIMBN~8 Preferred embodiments of the present invention will now be described with reference to FIGS. 1-3.
Shown in FIG. 1 is a subskantially planar video tape cassette lO, including generally a cassette base 12, a cassette cover 14, a left tape reel 16 and a right tape reel 1~. Tape 19 i5 wound betwean the r~els 16, 18. Each tape reel 16 and 18 includes a hub 20 and 22, an upper flange 24 and 26, and a lower ~lange 36 and 38, respectively. A window 28 allows the reels 16 and 18 to be seen. Reel leaf springs 29, 31 can also be seen hiasing centrally the tape reels 16, 18, respectively.
The tape cassette 10 also includes a dust door 30 which is spring biased and pivotable between a first, open position and a second, closed position. This dust door 30, except for tha features described below, iB otherwise conventional. An example of such a dust door 30 is described in Assignee's U.S.
Patent No. 4,533,093, ~ntitled "Tape Cassette Dust Door Spring Assembly and Method for Assembling Same."
The dust door 30 according to the present invention includes tapc reel locking means 42 in the form of, e~g., a pair of projections 44 and 46. The projections 44, 46 are preferably formed integrally o~ the dust door 30 during molding thereof. The projections 44, 46, as can be seen in FIGS. 1 - 3, are substantially T-shaped in cross section, including a planar base member 48 connected to the dust door upper wall 32, and a perpendicular, planar extension member 50 protruding inwardly from the base member 48.
Each planar extension member 50 can have a beveled edge and a rounded corner, said features facilitating cooperation with the teeth 56 described below.
Openings 52, 54, formed at the front edge 34 of the cover 14, are also substantially T-shaped and receive the projections 44, 46, respectiveiy, when the dust door 30 is moving between the first, closed position and the second, open lo position.
Each of the upper flanges 24, 26 of the tape reels 16, 18, respectively, includes a plurality of receptacles formed by teeth 56 formed circumferentially thereon. The teeth 56 are formed to cooperate with the perpendicular extension 1~ members 50.
FIG. 2 is a side cross-sectional view of th~ projection 44 engaged between two circumferential teeth 56 formed on the tape reel upper flange 24, when the dust door 30 is in the first, closed position. That is, the projections 44, 46 extend, when the dust door 30 i5 in the first, closed position, through the openings 52, 54 formed in a front edge 34 of the cassette cover 14 and are received between the teeth 56 formed on the circumference of the tape reel upper flanges 24 and 26.
The first, closed position of the dust door 30 illustrated by FIGS. 1 and 2 is characteristic of when the ,, tape cassette 10 i5 not being operated by the tape player/recorder, e.g., ~uring shipping, handling, storage, etc. In this position, the reel locking means 42 reliably keeps the tape reels 16, 18 from rotating, ther~by preventing s despooling.
In contrast, when the tape cassette 10 is loaded in a tape player/recorder, the player/recorcler moves the dust door 30 from the first, closed position to the second, open position against the force of the dust door spring (not shown~. In this regard, operation of the dust door 30 is the same as with a conventional, biased, pivoting dust door.
As shown in FIG. 3, as the dust door 30 is opened, the projection 44 disengages from the tePth 56 on the tape reel 16, which allows the tape reels 16, 18 to frealy rotate for feeding the tape 19 through the tape player/recoxder.
As described above, a key to the present invention i5 that one spring now serves the purpose of closing the dust door and locking the hubs, in contrast to the at least two springs conventionally required. One of ordinary skill, of course, would realize that if the particular reels are intended to take a full load of tape, e.g., a 11-90 tape cassette, the spring force of the dust door needed to effectively lock the reels may have to be greater than the spring force of the conventional dust door spring.
A significant benefit of this invention over the prior art is that the various walls/receptacles usually required at :
~ i3 ~
the rear, central area of the cassette, and the movable, ~ulti-piece reel lock, as shown in U.S. Patent Nos. 4,447,020 and ~,232,840, discussed above, or even the one piece tape rsel described in U.S. Serial No. 389,906 cited above, are no S longer necessary. This minimizes mold design and saves raw materials. It is noted, however, that due to induskry standards for a movable reel lock, an opening 58 may still be ~ormed at the rear of ths cassette base to allow the pin of the tape player/recorder free movement.
Further, by incorporating the reel locks into a conventional dust door, the overall number of parts of the cassette is reduced, there i8 no need to change in any way the standards set for the cassette or the tape player/recorder design, assembly is ~acilitated because, particularly, spring loading of a reel lock is eliminated, and operation is more reliable because there are no moving parts to this reel lock.
The above-described invention has been shown to be of the type intended for use in video player/recorders. However, the invention can be similarly applied to tape cassettes for use in audio or other recording and/or reproducing apparatus, if desired.
The for~going is considered illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described. For g _ s example, although it has been described above that the upper flanges 24, 26 of the tape reels 16, 18 include the teeth 56, the lower flanges 36, 38 could include teeth. Further, although cooperating projection/teeth combinations are described, other types o~ cooperating arrangements could be used. Accordingly, all suitable modifications and equivalents may be resorted to that fall within the scope o~ the invention and the appended claims.
~0
therein, the magnetic head o~ the player/recorder can gain access to the tape.
Video tape cassettes also include tape reel locks to prevent unwanted tape reel rotation which causes "despooling"
of the tape during shipping, handling, etc. Despooled, tape, of course, can be damaged.
As a tape reel lock, the industry has almost uniformly adopted a multipieca reel lock, such as shown and described in U.S. Patent Nos. 4,447,020 or 4,232,840~ Such mul~ipiece reel locks include a separate actuator/retractorJ a pair of separate ~ovable arms for respectively locking the reels, and a separate spring for biasing the arms toward the reels.
These reel locks are assembled between the tape reels in walls/receptacles formed at the rear of the cassette base and are actuated by a pin of the tape player/recorder that protrudes through an opening formed at the rear vf the base, when the player/recorder is operated.
Of course, such a multipiece lock is expensive to produce and assemble. Further, due to the number o~ parts and the fabrication requirements for each part, production yields cannot be maximized. Finally, there is always the chance that the parts, such as the spring, could become misaligned during shipping, handling or use, and fail to properly operate, Assignee's currently pending U.S. Patent Application Serial No. 389,906, entitled "Video Cassette Integral Actuator/Reel Lock Sprin~" provides an improved one-piece, ~ ~J ~)3 ~ ~
biased reel lock to replace the conventional multipiece reel lock, significantly decreasing manu~acturing and assembly cost~.
There is also known a sliding locking member for certain S audio cassettes, such as described in U.S. Patent No.
4,728,056. More particularly, a substantially planar locking member is spring biased for normally urging protrusions formed inwardly thereon against the tape reel hubs. When the cassette is placed in a tape player/recorder, the locking member ic retracted by the tape player/recorder, to remove the protrusions from engagement with the hubs and allow the hubs to rotate.
This type of device also suffers ~rom manufacturing inefficiencies since the locking member must be spring loaded.
Further, this type of device may be applicable only to a cassette used in a pulse code modulation system, as described in the '056 patent. Finally, the size, shape and sliding movement of thè locking member do not provide much design flexibility for tape cassettes.
As can be seen, the art still is in need of a reel lock which needs no asse~bly and reguires no moving parts or springs, to further simplify structure, improve quality and reliability, and minimize costs.
8UMMARY OF ~ INV~NT~ON
Accordingly, it is a purpose of the present invention to provide a tape cassette which can be made at less cost.
` ' ' .
2 ~ c~ ~ 3 ~ ~
It is another purpose o~ the present invention to provide a tape cassette requiring fewer parts than conventional tape cassettes.
It is another purpose of the present invention to provide a reel lock re~uiring no assembly o~ parts into a video cassette or separate biased mounting.
It is another purpose o~ the present invention to provide a reel lock which is incorporated with another member already existing in the tape cassette for another purpose.
It is another purpose of the present invention to provide a video cassette reel lock which lacks moving or working parts, except cooperation between the reels and the dust door, to improve reliability.
Finally, it is a purpose of the present invention to provide a reel lock projecting inwardly from the dust door to cooperate with the tape reels and thereby prevent despooling o~ the tape, when the cassette is not received by the tape p~ayer/recorder.
To achieve the foregoing and other purposes of the present invention, and in accordance with the purposes of the invention there is provided a pivotable, spring-biased dust door movable between a first, closed position and a second, open position. The dust door has formed inwardly thereon a pair of spaced projections. The proiections extend, when the dust door is in the second, closed position, through corresponding openings formed in a front edge of the cassette 3 ~ .~
cover and engage teeth formed on the circumference of each tape reel upper flange. When the dust door is moved from the first, closed position to the second, open position, the projections disengage from the tape reel flanges, thereby S allowing the tape reels to rotate freely for operation.
Other features and advantages of the present invention will be appaxent from the following description taken in conjunction with the accompanying drawings, in which like reference characters designate the same or similar parts throughout the figures thereof.
~RIEF 32E~CRIP~!ION_O~F_T~I~5 D~AWI~G~
The accompanying drawings, which are incorporat,ed in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the in~ention.
FIG. 1 is a top view of the top cassette according to the present invention illustrating reel locks which are formed on the dust door and engaged with the tape reel flanges.
FIG. 2 is a side, cross-sectional view, taken along line 2 - 2 of FIG. 1, of one of the reel looks engaged with circumferential teeth of a tape reel upper flange, when the dust door is`~n the first, closed position.
FIG. 3 is a side, cross-sectional view of one of the reel locks disengaged from the teeth on the tape reel upper flange circumference, when the dust door is in the second, open position.
~J ~ 3 DE8CRIP~ION QF_~E PREFERREP E~BODIMBN~8 Preferred embodiments of the present invention will now be described with reference to FIGS. 1-3.
Shown in FIG. 1 is a subskantially planar video tape cassette lO, including generally a cassette base 12, a cassette cover 14, a left tape reel 16 and a right tape reel 1~. Tape 19 i5 wound betwean the r~els 16, 18. Each tape reel 16 and 18 includes a hub 20 and 22, an upper flange 24 and 26, and a lower ~lange 36 and 38, respectively. A window 28 allows the reels 16 and 18 to be seen. Reel leaf springs 29, 31 can also be seen hiasing centrally the tape reels 16, 18, respectively.
The tape cassette 10 also includes a dust door 30 which is spring biased and pivotable between a first, open position and a second, closed position. This dust door 30, except for tha features described below, iB otherwise conventional. An example of such a dust door 30 is described in Assignee's U.S.
Patent No. 4,533,093, ~ntitled "Tape Cassette Dust Door Spring Assembly and Method for Assembling Same."
The dust door 30 according to the present invention includes tapc reel locking means 42 in the form of, e~g., a pair of projections 44 and 46. The projections 44, 46 are preferably formed integrally o~ the dust door 30 during molding thereof. The projections 44, 46, as can be seen in FIGS. 1 - 3, are substantially T-shaped in cross section, including a planar base member 48 connected to the dust door upper wall 32, and a perpendicular, planar extension member 50 protruding inwardly from the base member 48.
Each planar extension member 50 can have a beveled edge and a rounded corner, said features facilitating cooperation with the teeth 56 described below.
Openings 52, 54, formed at the front edge 34 of the cover 14, are also substantially T-shaped and receive the projections 44, 46, respectiveiy, when the dust door 30 is moving between the first, closed position and the second, open lo position.
Each of the upper flanges 24, 26 of the tape reels 16, 18, respectively, includes a plurality of receptacles formed by teeth 56 formed circumferentially thereon. The teeth 56 are formed to cooperate with the perpendicular extension 1~ members 50.
FIG. 2 is a side cross-sectional view of th~ projection 44 engaged between two circumferential teeth 56 formed on the tape reel upper flange 24, when the dust door 30 is in the first, closed position. That is, the projections 44, 46 extend, when the dust door 30 i5 in the first, closed position, through the openings 52, 54 formed in a front edge 34 of the cassette cover 14 and are received between the teeth 56 formed on the circumference of the tape reel upper flanges 24 and 26.
The first, closed position of the dust door 30 illustrated by FIGS. 1 and 2 is characteristic of when the ,, tape cassette 10 i5 not being operated by the tape player/recorder, e.g., ~uring shipping, handling, storage, etc. In this position, the reel locking means 42 reliably keeps the tape reels 16, 18 from rotating, ther~by preventing s despooling.
In contrast, when the tape cassette 10 is loaded in a tape player/recorder, the player/recorcler moves the dust door 30 from the first, closed position to the second, open position against the force of the dust door spring (not shown~. In this regard, operation of the dust door 30 is the same as with a conventional, biased, pivoting dust door.
As shown in FIG. 3, as the dust door 30 is opened, the projection 44 disengages from the tePth 56 on the tape reel 16, which allows the tape reels 16, 18 to frealy rotate for feeding the tape 19 through the tape player/recoxder.
As described above, a key to the present invention i5 that one spring now serves the purpose of closing the dust door and locking the hubs, in contrast to the at least two springs conventionally required. One of ordinary skill, of course, would realize that if the particular reels are intended to take a full load of tape, e.g., a 11-90 tape cassette, the spring force of the dust door needed to effectively lock the reels may have to be greater than the spring force of the conventional dust door spring.
A significant benefit of this invention over the prior art is that the various walls/receptacles usually required at :
~ i3 ~
the rear, central area of the cassette, and the movable, ~ulti-piece reel lock, as shown in U.S. Patent Nos. 4,447,020 and ~,232,840, discussed above, or even the one piece tape rsel described in U.S. Serial No. 389,906 cited above, are no S longer necessary. This minimizes mold design and saves raw materials. It is noted, however, that due to induskry standards for a movable reel lock, an opening 58 may still be ~ormed at the rear of ths cassette base to allow the pin of the tape player/recorder free movement.
Further, by incorporating the reel locks into a conventional dust door, the overall number of parts of the cassette is reduced, there i8 no need to change in any way the standards set for the cassette or the tape player/recorder design, assembly is ~acilitated because, particularly, spring loading of a reel lock is eliminated, and operation is more reliable because there are no moving parts to this reel lock.
The above-described invention has been shown to be of the type intended for use in video player/recorders. However, the invention can be similarly applied to tape cassettes for use in audio or other recording and/or reproducing apparatus, if desired.
The for~going is considered illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described. For g _ s example, although it has been described above that the upper flanges 24, 26 of the tape reels 16, 18 include the teeth 56, the lower flanges 36, 38 could include teeth. Further, although cooperating projection/teeth combinations are described, other types o~ cooperating arrangements could be used. Accordingly, all suitable modifications and equivalents may be resorted to that fall within the scope o~ the invention and the appended claims.
~0
Claims (9)
1. A tape cassette to be received by a tape player/recorder, comprising:
(a) a cover;
(b) a base;
(c) a tape reel mounted for biased rotation between the cover and base;
(d) a dust door pivotable between a first, closed position and a second, open position; and (e) means, formed on of the dust door and the tape reel, for preventing rotation of the tape reel, when the tape cassette is not received by the tape player/recorder.
(a) a cover;
(b) a base;
(c) a tape reel mounted for biased rotation between the cover and base;
(d) a dust door pivotable between a first, closed position and a second, open position; and (e) means, formed on of the dust door and the tape reel, for preventing rotation of the tape reel, when the tape cassette is not received by the tape player/recorder.
2. The cassette as recited in claim 1, wherein the means for preventing rotation comprises:
a projection formed inwardly on the dust door; and a flange formed on the tape reel having, on an outer circumference thereof, a plurality of receptacles, wherein at least one of the plurality of receptacles receives the projection when the dust door is in the second, closed position.
a projection formed inwardly on the dust door; and a flange formed on the tape reel having, on an outer circumference thereof, a plurality of receptacles, wherein at least one of the plurality of receptacles receives the projection when the dust door is in the second, closed position.
3. The cassette as recited in claim 2, wherein the projection includes a planar base member connected to the dust door and a perpendicular, planar extension member protruding inwardly from the base member.
4. The cassette as recited in claim 3, wherein the flange is an upper flange and the plurality of receptacles is a plurality of teeth formed continuously along the circumference of the upper flange.
5. The cassette as recited in claim 4, wherein the cassette cover includes an opening through which the projection is received as the dust door moves from the first, closed position to the second, open position.
6. A video tape cassette to be received by a tape player/recorder, comprising:
(a) a cover;
(b) a base;
(c) a pair of tape reels mounted for biased rotation between the cover and base;
(d) a biased dust door pivotable between a first, closed position and a second, open position; and (e) means, formed integrally on the dust door and the tape reels, for preventing rotation of the tape reels, when the tape cassette is not received by the tape player/recorder.
(a) a cover;
(b) a base;
(c) a pair of tape reels mounted for biased rotation between the cover and base;
(d) a biased dust door pivotable between a first, closed position and a second, open position; and (e) means, formed integrally on the dust door and the tape reels, for preventing rotation of the tape reels, when the tape cassette is not received by the tape player/recorder.
7. The tape cassette as recited in claim 6, wherein the means for preventing rotation comprises:
a pair of spaced projections formed on the dust door; and a flange formed on an upper portion of each tape reel, having on an outer circumference thereof a plurality of teeth, wherein the projections are received between teeth of each upper flange, when the dust door is in the first, closed position.
a pair of spaced projections formed on the dust door; and a flange formed on an upper portion of each tape reel, having on an outer circumference thereof a plurality of teeth, wherein the projections are received between teeth of each upper flange, when the dust door is in the first, closed position.
8. The cassette as recited in claim 7, wherein each projection includes a planar base member connected to the dust door and a perpendicular, planar extension member protruding inwardly from the base member.
9. The cassette as recited in claim 8, wherein the cassette cover includes a pair of spaced openings through which the respective projections are received as the dust door moves from the first, closed position to the second, open position.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US59180490A | 1990-10-02 | 1990-10-02 | |
| US07/591,804 | 1990-10-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2050369A1 true CA2050369A1 (en) | 1992-04-03 |
Family
ID=24368014
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002050369A Abandoned CA2050369A1 (en) | 1990-10-02 | 1991-08-30 | Dust door incorporating tape reel lock |
Country Status (10)
| Country | Link |
|---|---|
| JP (1) | JPH06111526A (en) |
| KR (1) | KR920008730A (en) |
| BR (1) | BR9104255A (en) |
| CA (1) | CA2050369A1 (en) |
| DE (1) | DE4130552A1 (en) |
| ES (1) | ES2048061B1 (en) |
| FR (1) | FR2671222B1 (en) |
| GB (1) | GB2248436B (en) |
| IT (1) | IT1250781B (en) |
| MX (1) | MX9101088A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW255962B (en) * | 1992-06-30 | 1995-09-01 | Shape Inc |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1450744A (en) * | 1973-02-01 | 1976-09-29 | Sony Corp | Magnetic tape cassettes |
| JPS581904Y2 (en) * | 1978-02-17 | 1983-01-13 | ソニー株式会社 | tape cassette |
| GB2019356B (en) * | 1978-03-23 | 1982-04-21 | Sony Corp | Tape cassette |
| JPS6325583Y2 (en) * | 1981-05-14 | 1988-07-12 | ||
| US4472753A (en) * | 1983-10-24 | 1984-09-18 | Minnesota Mining And Manufacturing Company | Braking mechanism for cassette tape reel |
| JPH0345349Y2 (en) * | 1984-12-21 | 1991-09-25 | ||
| JPH0447820Y2 (en) * | 1986-01-31 | 1992-11-11 | ||
| US4884159A (en) * | 1986-11-05 | 1989-11-28 | Tdk Corporation | Braking arrangement in a magnetic tape cassette |
| WO1988008196A1 (en) * | 1987-04-13 | 1988-10-20 | John Michael Woodbury | Video cassettes |
| KR930005620Y1 (en) * | 1989-12-21 | 1993-08-23 | 주식회사 에스케이씨 | Reel locking deice for video cassette tape |
-
1991
- 1991-08-30 CA CA002050369A patent/CA2050369A1/en not_active Abandoned
- 1991-09-06 GB GB9119045A patent/GB2248436B/en not_active Expired - Fee Related
- 1991-09-13 DE DE4130552A patent/DE4130552A1/en not_active Withdrawn
- 1991-09-13 MX MX9101088A patent/MX9101088A/en unknown
- 1991-09-26 KR KR1019910016827A patent/KR920008730A/en not_active Application Discontinuation
- 1991-09-26 IT ITRM910722A patent/IT1250781B/en active IP Right Grant
- 1991-09-30 JP JP3278483A patent/JPH06111526A/en active Pending
- 1991-10-02 FR FR9112138A patent/FR2671222B1/en not_active Expired - Fee Related
- 1991-10-02 ES ES09102161A patent/ES2048061B1/en not_active Expired - Lifetime
- 1991-10-02 BR BR919104255A patent/BR9104255A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| KR920008730A (en) | 1992-05-28 |
| ITRM910722A0 (en) | 1991-09-26 |
| JPH06111526A (en) | 1994-04-22 |
| MX9101088A (en) | 1992-06-05 |
| FR2671222A1 (en) | 1992-07-03 |
| BR9104255A (en) | 1992-06-02 |
| ES2048061R (en) | 1995-11-16 |
| ES2048061A2 (en) | 1994-03-01 |
| ES2048061B1 (en) | 1996-07-01 |
| DE4130552A1 (en) | 1992-04-09 |
| GB9119045D0 (en) | 1991-10-23 |
| FR2671222B1 (en) | 1996-01-26 |
| GB2248436A (en) | 1992-04-08 |
| GB2248436B (en) | 1994-07-06 |
| IT1250781B (en) | 1995-04-21 |
| ITRM910722A1 (en) | 1992-04-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |