JPH0525101Y2 - - Google Patents

Description

【考案の詳細な説明】 〔産業上の利用分野〕 本考案は、ビデオテープレコーダ（以下、
VTRという）等に使用される磁気テープカセツ
トに係り、特にVTR挿入側となるカセツト本体
の前面に開閉可能に設けられる前蓋の装着構造に
関する。[Detailed description of the invention] [Industrial application field] The present invention is a video tape recorder (hereinafter referred to as
The present invention relates to magnetic tape cassettes used in VTRs, etc., and particularly to a mounting structure for a front cover that is openable and closable on the front surface of the cassette body on which the VTR is inserted.

〔従来の技術〕[Conventional technology]

第６図乃至第１０図は、家庭用のVTRに使用
される従来の磁気テープカセツトで、第６図は磁
気テープカセツトを下ハーフ側から見た一部切欠
き背面図、第７図は上ハーフの側壁前部を示す斜
視図、第８図は両ハーフ組付け後の要部の斜視
図、第９図は第６図の−断面図、第１０図は
第６図左上の切欠き部に対応する下ハーフ隅部の
部分図を示しめしている。 Figures 6 to 10 show conventional magnetic tape cassettes used in household VTRs, with Figure 6 being a partially cutaway rear view of the magnetic tape cassette seen from the lower half side, and Figure 7 being the top. A perspective view showing the front part of the side wall of the half, Figure 8 is a perspective view of the main parts after both halves are assembled, Figure 9 is a cross-sectional view of Figure 6, and Figure 10 is the notch on the upper left of Figure 6. A partial view of the lower half corner corresponding to is shown.

磁気テープカセツト１は、上ハーフ２と下ハー
フ３とでカセツト本体４が形成され、該カセツト
本体４内に磁気テープ５を巻装する供給リール６
と巻取りリール７との一対の巻回リールが収納さ
れている。VTR挿入側となるカセツト本体４の
前部には、両リール６，７から繰り出されて、テ
ープガイド部４ａ，４ｂの前面を走行する磁気テ
ープ５を開閉可能に覆う前蓋８が被着されてい
る。 The magnetic tape cassette 1 has a cassette body 4 formed by an upper half 2 and a lower half 3, and a supply reel 6 for winding a magnetic tape 5 inside the cassette body 4.
A pair of winding reels including a winding reel 7 and a winding reel 7 are housed. A front cover 8 is attached to the front part of the cassette main body 4, which is the side where the VTR is inserted, to cover the magnetic tape 5, which is unwound from the reels 6 and 7 and runs on the front surfaces of the tape guide parts 4a and 4b, in an openable and closable manner. ing.

この前蓋８は、前板８ａと天板８ｂの両側に側
板８ｃ，８ｄを延設した平面コ字形に形成され、
該側板８ｃ，８ｄには、回動支持部８ｅ，８ｆが
延設され、回動支持部８ｅの内側には、短軸状の
回動支軸９が、回動支持部８ｆの内側には、長軸
状の回動支軸１０が夫々設けられている。 The front lid 8 is formed in a U-shape in plan with side plates 8c and 8d extending on both sides of a front plate 8a and a top plate 8b.
Rotation support portions 8e and 8f extend from the side plates 8c and 8d, and a short shaft-shaped rotation support shaft 9 is provided inside the rotation support portion 8e, and a rotation support shaft 9 in the shape of a short shaft is provided inside the rotation support portion 8f. , and long axis-shaped rotation support shafts 10 are provided, respectively.

回動支軸１０が支承される上ハーフ２の側壁２
ｂの前部には、第７図に示す如く、回動支持部８
ｆが配設される凹部１１が形成されている。ま
た、該凹部１１が形成される薄壁１２には、上ハ
ーフ２の前部側と下ハーフ３側を開口した切欠部
１３が形成され、該切欠部１３のコーナー１３ａ
に、回動支軸１０が支承される。回動支軸９が支
承される上ハーフ２の側壁２ａの前部にも、凹部
１１と同様の凹部が形成され、該凹部に回動支持
部８ｅが配設される。 Side wall 2 of upper half 2 on which rotation support shaft 10 is supported
In the front part of b, as shown in FIG.
A recess 11 is formed in which f is placed. In addition, a notch 13 is formed in the thin wall 12 in which the recess 11 is formed, and the cutout 13 is opened at the front side of the upper half 2 and the lower half 3 side.
A rotation support shaft 10 is supported on. A recess similar to the recess 11 is also formed in the front part of the side wall 2a of the upper half 2 on which the rotation support shaft 9 is supported, and the rotation support part 8e is disposed in the recess.

前記回動支軸１０には、前蓋８を常時閉状態に
保持するつる巻き状のスプリング１４が係止され
ている。 A helical spring 14 that keeps the front cover 8 in a normally closed state is engaged with the rotation support shaft 10 .

該スプリング１４に対応する下ハーフ３の隅部
には、前蓋係止部材１５が、その上部両側の支軸
１５ａ，１５ａを下ハーフ３のリブ３ａ，３ａに
懸架して回動可能に吊持され、該前蓋係止部材１
５は、一方の支軸１５ａに装着される前蓋係止部
材用スプリング１６の付勢力によつて、ロツク用
突起１５ｂと解除用突起１５ｃとが下ハーフ３の
側壁３ｂから外部へ突出して設けられ、ロツク用
突起１５ｂが前蓋８に係合し、前蓋８を閉状態に
保持している。 At the corner of the lower half 3 corresponding to the spring 14, a front lid locking member 15 is rotatably suspended by supporting shafts 15a, 15a on both sides of the upper part thereof, suspended from the ribs 3a, 3a of the lower half 3. The front lid locking member 1
5 is provided with a locking protrusion 15b and a releasing protrusion 15c protruding outward from the side wall 3b of the lower half 3 by the urging force of a spring 16 for a front cover locking member attached to one of the support shafts 15a. The locking protrusion 15b engages with the front lid 8 to hold the front lid 8 in a closed state.

前記つる巻き状ばねからなるスプリング１４
は、スプリング性の線材を折曲して形成されるも
ので、回動支軸１０に突設した係止ピン１７に係
止される一端１４ａと、該一端１４ａに連設して
形成され、回動支軸１０に外嵌されるコイル部１
４ｂと、該コイル部１４ｂから直線状に延びて上
ハーフ２の天部内面２ｃに圧接する屈曲部１４ｃ
と、該屈曲部１４ｃから直線状に延びて上ハーフ
２の内面に形成したガイド溝１８に摺動可能に圧
接される他端１４ｄとを有している。 Spring 14 made of the helical spring
is formed by bending a spring-like wire rod, and has one end 14a that is locked to a locking pin 17 protruding from the rotation support shaft 10, and is formed in a continuous manner with the one end 14a. Coil portion 1 externally fitted on rotation support shaft 10
4b, and a bent portion 14c that extends linearly from the coil portion 14b and presses against the top inner surface 2c of the upper half 2.
and the other end 14d that extends linearly from the bent portion 14c and is slidably pressed against a guide groove 18 formed on the inner surface of the upper half 2.

そして、上ハーフ２の切欠部１３のコーナー１
３ａに、前蓋８の回動支軸１０を支承させると共
に、回動支軸１０に取付けたスプリング１４の屈
曲部１４ｃを上ハーフ２の天部内面２ｃに、他端
１４ｄをガイド溝１８に夫々圧接させて、前蓋８
を上ハーフ２に組付けた後、上ハーフ２に下ハー
フ３をビス１９で螺着して、上ハーフ２と下ハー
フ３により、回動支軸１０を完全に支承してカセ
ツト本体４を形成する。 Corner 1 of the notch 13 of the upper half 2
3a supports the pivot shaft 10 of the front lid 8, and the bent portion 14c of the spring 14 attached to the pivot shaft 10 is attached to the top inner surface 2c of the upper half 2, and the other end 14d is attached to the guide groove 18. Press them together and attach the front lid 8.
After assembling the lower half 3 to the upper half 2, screw the lower half 3 to the upper half 2 with screws 19, and the upper half 2 and lower half 3 completely support the pivot shaft 10, and the cassette main body 4 is mounted. Form.

ところが、前蓋８を上ハーフ２に組付ける際
に、スプリング１４の屈曲部１４ｃと他端１４ｄ
のみ上ハーフ２内面に圧接しているので、スプリ
ング１４の弾発力により前蓋８と上ハーフ２の連
結状態が不安定で、スプリング１４装着側の回動
支軸１０が切欠部１３の上ハーフ２前部側に外れ
易いため、前蓋８の再組付けに手間が掛かると共
に、スプリングを紛失するなど作業性が悪かつ
た。 However, when assembling the front cover 8 to the upper half 2, the bent portion 14c and the other end 14d of the spring 14
Since only the front cover 8 and the upper half 2 are in pressure contact with the inner surface of the upper half 2, the connection state between the front cover 8 and the upper half 2 is unstable due to the elastic force of the spring 14, and the rotation support shaft 10 on the side where the spring 14 is attached is placed above the notch 13. Since the half 2 easily comes off toward the front side, reassembling the front cover 8 is time-consuming, and the work efficiency is poor as the spring may be lost.

このため、実開昭59−138083号公報に開示され
ている如く、上ハーフの凹部内側に、上ハーフの
天部内面からＬ字状の支持壁を突設し、前蓋を閉
状態に保持するスプリングのコイル部を回動支軸
に外嵌して、このスプリングの両端を前蓋と上ハ
ーフとに夫々係止すると共に、回動支軸を支持壁
の稜縁に圧接し、回動支軸がスプリングの弾発力
で上ハーフの前部側への外れを防止して、前記不
都合を解消している。 For this reason, as disclosed in Japanese Utility Model Application Publication No. 59-138083, an L-shaped support wall is provided inside the recess of the upper half to protrude from the inner surface of the top of the upper half to hold the front cover in the closed state. The coil part of the spring to be rotated is fitted onto the rotation support shaft, and both ends of this spring are locked to the front cover and the upper half, respectively, and the rotation support shaft is pressed against the ridge edge of the support wall to rotate the spring. The support shaft prevents the upper half from coming off toward the front side by the elastic force of the spring, thereby solving the above-mentioned problem.

〔考案が解決しようとする課題〕[The problem that the idea aims to solve]

しかしながら、上述の支持壁は、回動支軸その
ものと常時圧接係合しているため、回動支軸の回
動による摺接によつて互いに削られて屑が生じる
虞が十分にあり、しかも、上ハーフと下ハーフを
組み付けた際の回動支軸と支持壁との摺接部に
は、カセツト本体内に位置しているので、この屑
が磁気テープに付着してドロツプアウトの原因に
なることがある。 However, since the above-mentioned support wall is constantly pressed into contact with the rotational support shaft itself, there is a good chance that the sliding contact caused by the rotation of the rotational support shaft will scrape each other and generate debris. When the upper and lower halves are assembled, the sliding contact between the pivot shaft and the support wall is located inside the cassette body, so debris can adhere to the magnetic tape and cause dropouts. Sometimes.

本考案は、かかる実情を背景にしてなされたも
ので、前蓋の上ハーフへの組付け作業性を向上さ
せると共に、ドロツプアウトの原因を極力防止し
た磁気テープカセツトを提供することを目的とし
ている。 The present invention was developed against the background of the above circumstances, and aims to provide a magnetic tape cassette that improves the workability of assembling it to the upper half of the front cover and prevents drop-outs as much as possible.

〔課題を解決するための手段〕[Means to solve the problem]

本考案は、上述の目的を達成するため、上ハー
フと下ハーフとでカセツト本体を形成し、該上ハ
ーフの側壁前部に、カセツト本体の前部に開閉可
能に装着される前蓋の側板に延設した回動支持部
が配設される凹部を形成すると共に、該凹部が形
成される薄壁に、上ハーフの前部側と下ハーフ側
を開口した切欠部を形成し、該切欠部のコーナー
に、前蓋の前記回動支持部に設けた回動支軸を支
承せしめ、該回動支軸に装着したスプリングによ
り前記前蓋を常時閉方向へ付勢した磁気テープカ
セツトにおいて、前記スプリングを、一端が回動
支軸に係止され、他端が上ハーフ前部内面に摺動
可能に圧接され、一端と他端との間に下ハーフ側
に膨出する湾曲部を有する板ばねで形成し、前記
凹部の前部側に、上ハーフに下ハーフを組付ける
前に前記回動支軸と係合して該回動支軸の上ハー
フの前部側への移動を規制する係合突起を、前記
薄壁から下ハーフ側へ向けて突設したことを特徴
とするものである。 In order to achieve the above-mentioned object, the present invention includes an upper half and a lower half that form a cassette body, and a side plate of a front lid that is attached to the front of the side wall of the upper half so as to be openable and closable. A recess is formed in which the rotation support part extending from the top is formed, and a notch is formed in the thin wall in which the recess is formed, and the front side of the upper half and the lower half are opened, and the notch is A magnetic tape cassette in which a rotation support shaft provided on the rotation support portion of the front cover is supported at a corner of the front cover, and the front cover is always biased in the closing direction by a spring attached to the rotation support portion, The spring has one end locked to the rotation shaft, the other end slidably pressed against the inner surface of the front part of the upper half, and a curved part bulging toward the lower half between the one end and the other end. A leaf spring is formed on the front side of the recess, and engages with the pivot shaft before assembling the lower half to the upper half to prevent the pivot shaft from moving toward the front side of the upper half. The device is characterized in that a restricting engagement protrusion is provided to protrude from the thin wall toward the lower half side.

〔作用〕[Effect]

したがつて、回動支軸に装着されるスプリング
を、回動支軸に係止される一端と上ハーフ前部内
面に摺動可能に圧接される他端との間に下ハーフ
側に膨出する湾曲部を有する板ばねで形成したの
で、前蓋を上ハーフに組付けた際に、該スプリン
グの弾発力は、回動支軸と上ハーフの前部内面に
略均等にかかるため、つる巻き状ばねからなるス
プリングを用いた場合に比べ、回動支軸が上ハー
フの切欠部のコーナーから殆ど浮き上がらず、上
ハーフに下ハーフを組付ける前でも外れにくい状
態にある。 Therefore, the spring attached to the rotation support shaft is expanded toward the lower half between one end that is locked to the rotation support shaft and the other end that is slidably pressed against the inner surface of the front part of the upper half. Since it is formed of a leaf spring with a curved part that extends, when the front cover is assembled to the upper half, the elastic force of the spring is applied almost equally to the pivot shaft and the front inner surface of the upper half. Compared to the case where a helical spring is used, the pivot shaft hardly lifts up from the corner of the notch of the upper half, and it is difficult to come off even before the lower half is assembled to the upper half.

また、上ハーフに下ハーフを組付ける前に、何
等かの拍子に回動支軸が上ハーフの前部側へ移動
しようとしても、回動支軸が係合突起と係合し
て、回動支軸の上ハーフの前部側への移動を規制
するので、上ハーフに下ハーフを組付ける前の前
蓋の脱落を防止でき、しかも、上ハーフと下ハー
フとを組付けた際に、回動支軸が回動しても、摺
接による屑の発生を極力抑えることができ、発生
した屑がカセツト本体に入りにくく、屑が磁気テ
ープに付着して発生するドロツプアウトの原因を
なくすことができる。 In addition, even if the rotation support shaft somehow tries to move toward the front side of the upper half before assembling the lower half to the upper half, the rotation support shaft will engage with the engagement protrusion and the rotation will be interrupted. Since the movement of the upper half of the dynamic support shaft toward the front side is restricted, it is possible to prevent the front cover from falling off before assembling the lower half to the upper half. Even when the rotation shaft rotates, the generation of debris due to sliding contact can be minimized, making it difficult for the generated debris to enter the cassette body, eliminating the cause of dropouts caused by debris adhering to the magnetic tape. be able to.

〔実施例〕 以下、本考案の一実施例を第１図乃至第５図に
基づいて説明する。[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

前蓋８の長軸状の回動支軸２０に係止される前
蓋用のスプリング２１は、ばね用鋼板やステンレ
ス鋼板等の弾性を有する板ばねで形成したもの
で、回動支軸２０の先端側に形成されたスリツト
２０ａに挿入されて係止される一端２１ａと、上
ハーフ２の前部内面のガイド溝２２に摺動可能に
圧接される他端２１ｂと、一端２１ａと他端２１
ｂとの間に下ハーフ３側に膨出する湾曲部２１ｃ
とを有している。そして、このスプリング２１
は、回動支軸２０の略半周を抱持する一端２１ａ
をスリツト２０ａに挿入して回動支軸２０に係止
され他端２１ｂをガイド溝２２に摺動可能に圧接
して取付けられる。この際、他端２１ｂの先端
を、ストツパ突起２３に当接させるようにしても
よい。 The spring 21 for the front cover, which is locked to the long axis-shaped rotation support shaft 20 of the front cover 8, is formed of an elastic plate spring such as a spring steel plate or a stainless steel plate. one end 21a that is inserted into and locked in a slit 20a formed on the distal end side of the upper half 2; 21
A curved portion 21c that bulges toward the lower half 3 side between
It has And this spring 21
is one end 21a that holds approximately half the circumference of the rotation support shaft 20.
is inserted into the slit 20a and locked to the rotation support shaft 20, and the other end 21b is slidably pressed against the guide groove 22 and attached. At this time, the tip of the other end 21b may be brought into contact with the stopper protrusion 23.

回動支軸２０が支承される上ハーフ２の側壁ｂ
の前部には、第７図に示す従来例と同様に、回動
支持部８ｆが配設される凹部２４と、該凹部２４
が形成される薄壁２５に、上ハーフ２の前部側と
下ハーフ３側を開口した切欠部２６が形成され
（第１図参照）、該切欠部２６のコーナー２６ａ
に、回動支軸２０が支承される。 Side wall b of the upper half 2 on which the rotation support shaft 20 is supported
In the front part thereof, as in the conventional example shown in FIG.
A notch 26 that opens on the front side of the upper half 2 and the side of the lower half 3 is formed in the thin wall 25 in which the thin wall 25 is formed (see FIG. 1).
A rotation support shaft 20 is supported.

前記凹部２４の前部側には、上ハーフ２に下ハ
ーフ３を組付ける前に前記回動支軸２０と係合し
て該回動支軸２０の上ハーフ２の前部側への移動
を規制する係合突起２７が、前記薄壁２５から下
ハーフ３側へ向けて突設されている。そして、上
ハーフ２の凹部２４に前蓋８の回動支持部８ｆを
装着して、回動支持部８ｆ内側の回動支軸２０を
切欠部２６のコーナー２６ａに支承させることに
より、前蓋８を上ハーフ２に組付ける。 On the front side of the recess 24, before assembling the lower half 3 to the upper half 2, there is a groove that engages with the rotation support shaft 20 to move the rotation support shaft 20 toward the front side of the upper half 2. An engaging protrusion 27 for regulating the movement is provided to protrude from the thin wall 25 toward the lower half 3 side. Then, the rotation support part 8f of the front cover 8 is attached to the recess 24 of the upper half 2, and the rotation support shaft 20 inside the rotation support part 8f is supported by the corner 26a of the notch 26. Assemble 8 to upper half 2.

この前蓋８と上ハーフ２との組付け状態におい
て、回動支軸２０に装着されるスプリング２１
を、回動支軸２０に係止される一端２１ａと上ハ
ーフ２の前部内面に摺動可能に圧接される他端２
１ｂとの間に下ハーフ３側に膨出する湾曲部２１
ｃを有する板ばねで形成したので、スプリング２
１の弾発力は、回動支軸２０と上ハーフ２の前部
内面に略均等にかかるため、回動支軸２０が上ハ
ーフ２の切欠部２６のコーナー２６ａから殆ど浮
き上がらず、上ハーフ２に下ハーフ３を螺着する
前でも外れにくい状態にある。 When the front cover 8 and the upper half 2 are assembled, the spring 21 mounted on the rotation support shaft 20
one end 21a that is locked to the rotation support shaft 20 and the other end 2 that is slidably pressed against the front inner surface of the upper half 2.
1b, the curved portion 21 bulges toward the lower half 3 side.
Since it is formed with a leaf spring having c, spring 2
Since the elastic force of No. 1 is applied almost equally to the pivot shaft 20 and the front inner surface of the upper half 2, the pivot shaft 20 hardly lifts up from the corner 26a of the notch 26 of the upper half 2, and the upper half Even before lower half 3 is screwed onto 2, it is difficult to remove.

しかも、この状態で何等からの拍子に回動支軸
２０が上ハーフの前部側へ移動しようとしても、
回動支軸２０が係合突起２７と係合して、回動支
軸２０の上ハーフ２の前部側への移動を規制する
ので、上ハーフ２に下ハーフ３を組付ける前の前
蓋８の脱落を防止でき、前蓋８を上ハーフ２に安
定して組付けられる。 Moreover, even if the rotation support shaft 20 tries to move to the front side of the upper half for some reason in this state,
The rotation support shaft 20 engages with the engagement protrusion 27 and restricts the movement of the rotation support shaft 20 toward the front side of the upper half 2. The lid 8 can be prevented from falling off, and the front lid 8 can be stably assembled to the upper half 2.

そして、前蓋８を組付けた上ハーフ２に下ハー
フ３を螺着することにより形成される矩形の空所
２８に回動支軸２０が回動可能に挿通されて保持
される。 The rotation support shaft 20 is rotatably inserted and held in a rectangular space 28 formed by screwing the lower half 3 onto the upper half 2 to which the front lid 8 is attached.

したがつて、上ハーフ２と下ハーフ３とを組付
けた際に、回動支軸２０が回動しても、摺接によ
る屑の発生を極力抑えることができ、発生した屑
が空所２８等からカセツト本体４内に入りにくく
なり、屑が磁気テープ５に付着して発生するドロ
ツプアウトの原因をなくすことができる。 Therefore, even if the rotation support shaft 20 rotates when the upper half 2 and the lower half 3 are assembled, the generation of debris due to sliding contact can be suppressed as much as possible, and the generated debris can be removed from the empty space. 28 etc. becomes difficult to enter into the cassette main body 4, and the cause of dropouts caused by debris adhering to the magnetic tape 5 can be eliminated.

前記スプリング２１の取付け部と対応する下ハ
ーフ３の隅部には、前蓋８を閉状態に係止する前
蓋係止部材２９が、その上部両側の支軸２９ａ，
２９ａを下ハーフ３のリブ３ａ，３ａに懸架して
回動可能に吊持されている。この前蓋係止部材２
９は、スプリング２１の湾曲部２１ｃに押圧され
る回動用の被押圧部２９ｂと、下ハーフ３の側壁
３ｂから外部に突出するロツク用突起２９ｃ及び
解除用突起２９ｄとが設けられている。そして、
前蓋係止部材２９は、被押圧部２９ｂがスプリン
グ２１の湾曲部２１ｃに押圧されることにより、
支軸２９ａ，２９ａを支点に下ハーフ３の側壁３
ｂ方向へ付勢され、ロツク用突起２９ｃ及び解除
用突起２９ｄが側壁３ｂから外部に突出し、ロツ
ク用突起２９ｃが前蓋８に係合して、前蓋８を閉
状態に保持するもので、VTRの作用爪が解除用
突起２９ｄを押動すると、上記係合状態が解除さ
れる。 At the corner of the lower half 3 corresponding to the attachment part of the spring 21, there is a front lid locking member 29 that locks the front lid 8 in the closed state.
29a is suspended from the ribs 3a, 3a of the lower half 3 so as to be rotatable. This front lid locking member 2
Reference numeral 9 is provided with a pressed portion 29b for rotation that is pressed by the curved portion 21c of the spring 21, and a locking projection 29c and a releasing projection 29d that project outward from the side wall 3b of the lower half 3. and,
When the pressed portion 29b of the front lid locking member 29 is pressed by the curved portion 21c of the spring 21,
The side wall 3 of the lower half 3 is supported around the support shafts 29a, 29a.
The locking protrusion 29c and the releasing protrusion 29d project outward from the side wall 3b, and the locking protrusion 29c engages with the front cover 8 to hold the front cover 8 in a closed state. When the operating claw of the VTR pushes the release protrusion 29d, the engaged state is released.

なお、前記凹部２４の下ハーフ３側に、上ハー
フ２に下ハーフ３を組付ける前に前蓋８の回動支
持部８ｆと係合して回動支軸２０の下ハーフ３側
への移動を規制する突起３０を、前記切欠部２６
の下ハーフ３側開口へ突設すると、上ハーフ２に
下ハーフ３を組付ける前の前蓋８の脱落防止を一
層図ることができる。 In addition, before assembling the lower half 3 to the upper half 2, the lower half 3 side of the recess 24 engages with the rotation support part 8f of the front lid 8, and the rotation support shaft 20 is attached to the lower half 3 side. The protrusion 30 that restricts movement is inserted into the notch 26.
By protruding into the opening on the lower half 3 side, it is possible to further prevent the front lid 8 from falling off before the lower half 3 is assembled to the upper half 2.

本実施例は以上のように構成されるもので、磁
気テープカセツト１をVTRに装着すると、前蓋
８が開かれる動作と連動して、スプリング２１を
係止した回動支軸２０が第２図において時計方向
に回動し、スプリング２１が回動支軸２０に巻き
込まれて、湾曲部２１ｃが上ハーフ２側に小さく
後退して、他端２１ｂが上ハーフ２の前部内面の
ガイド溝２２を摺動して回動支軸２０側に後退す
る。 The present embodiment is constructed as described above, and when the magnetic tape cassette 1 is installed in a VTR, the rotation support shaft 20 with the spring 21 locked is moved to the second position in conjunction with the opening of the front cover 8. The spring 21 is rotated clockwise in the figure, the spring 21 is wound around the rotation support shaft 20, the curved portion 21c is slightly retreated toward the upper half 2, and the other end 21b is inserted into the guide groove on the front inner surface of the upper half 2. 22 and retreat to the rotation support shaft 20 side.

また、磁気テープカセツト１をVTRから取り
出すと、スプリング２１の復元力により、回動支
軸２０が第２図において反時計方向に回動され、
スプリング２１の他端２１ｂが回動支軸２０とは
反対方向へ前進して、前蓋８が閉位置に戻り、前
蓋係止部材２９が、スプリング２１の湾曲部２１
ｃにて押圧され、ロツク用突起２９ｃが前蓋８に
係合して、前蓋８が閉状態に保持される。 Further, when the magnetic tape cassette 1 is taken out from the VTR, the rotation support shaft 20 is rotated counterclockwise in FIG. 2 due to the restoring force of the spring 21.
The other end 21b of the spring 21 moves forward in the opposite direction to the pivot shaft 20, the front lid 8 returns to the closed position, and the front lid locking member 29 locks the curved portion 21 of the spring 21.
c, the locking protrusion 29c engages with the front lid 8, and the front lid 8 is held in the closed state.

〔考案の効果〕[Effect of idea]

本考案の磁気テープカセツトは以上説明したよ
うに、カセツト本体の上ハーフの側壁前部に、カ
セツト本体の前部に開閉可能に装着される前蓋の
側板に延設した回動支持部が配設される凹部を形
成し、該凹部によつて形成される薄壁に、上ハー
フの前部側と下ハーフ側を開口した切欠部を設
け、該切欠部のコーナーに前蓋の回動支持部に設
けた回動支軸を支承せしめ、該回動支軸に装着し
た前蓋を常時閉方向へ付勢するスプリングを、一
端が前記回動支軸に係止され、他端が上ハーフ前
部内面に摺動可能に圧接され、一端と他端との間
に下ハーフ側に膨出する湾曲部を有する板ばねで
形成し、前記凹部の前部側に、上ハーフに下ハー
フを組付ける前に前記回動支軸と係合して該回動
支軸の上ハーフの前部側への移動規制する係合突
起を、前記薄壁から下ハーフ側へ向けて突設した
ので、前蓋を上ハーフに組付けた際に、前記スプ
リングの弾発力が、回動支軸と上ハーフの前部内
面に略均等にかかるため、つる巻き状ばねからな
るスプリングを用いた場合に比べ、回動支軸が上
ハーフの切欠部のコーナーから殆ど浮き上がら
ず、前蓋が上ハーフに下ハーフを組付ける前でも
外れにくい状態に保持される。 As explained above, the magnetic tape cassette of the present invention is provided with a rotary support section extending from the side plate of the front cover, which is attached to the front of the cassette body so as to be openable and closable, on the front side wall of the upper half of the cassette body. A thin wall formed by the recess is provided with a notch that opens the front side of the upper half and the lower half side, and a rotation support for the front cover is provided at the corner of the notch. One end of the spring is fixed to the rotation support shaft, and the other end is fixed to the upper half. It is formed of a leaf spring that is slidably pressed against the inner surface of the front part and has a curved part that bulges toward the lower half between one end and the other end, and the lower half is attached to the upper half on the front side of the recessed part. An engaging protrusion that engages with the pivot shaft and restricts the movement of the upper half of the pivot shaft toward the front side before assembly is provided so as to protrude from the thin wall toward the lower half. , When the front cover is assembled to the upper half, the elastic force of the spring is applied almost equally to the pivot shaft and the front inner surface of the upper half, so when using a spring made of a helical spring. Compared to this, the pivot shaft hardly lifts up from the corner of the notch in the upper half, and the front cover is held in a state where it is difficult to come off even before the lower half is assembled to the upper half.

しかも、この保持状態で、何等からの拍子に回
動支軸が上ハーフの前部側へ移動しようとして
も、回動支軸が係合突起と係合して、回動支軸の
上ハーフの前部側への移動を規制するので、前蓋
の脱落を防止でき、さらに、上ハーフと下ハーフ
とを組付けた際に、回動支軸が回動しても、摺接
による屑の発生を極力抑えることができ、発生し
た屑がカセツト本体に入りにくく、屑が磁気テー
プに付着して発生するドロツプアウトの原因をな
くすことができる。 Moreover, in this holding state, even if the rotation support shaft tries to move toward the front side of the upper half for some reason, the rotation support shaft will engage with the engagement protrusion and the upper half of the rotation support shaft will move. This prevents the front cover from falling off.Furthermore, even if the pivot shaft rotates when the upper and lower halves are assembled, debris from sliding contact will be prevented. This makes it possible to suppress the generation of magnetic tape as much as possible, prevent the generated debris from entering the cassette body, and eliminate the cause of dropouts caused by debris adhering to the magnetic tape.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図乃至第５図は本考案の一実施例を示すも
ので、第１図は上ハーフの要部の斜視図、第２図
は第３図の−断面図、第３図は上ハーフを内
面側から見た要部の断面背面図、第４図は同要部
の断面側面図、第５図は両ハーフ組付け後の要部
の斜視図、第６図乃至第１０図は従来例を示し、
第６図は磁気テープカセツトを下ハーフ側から見
た一部切欠き背面図、第７図は上ハーフの側壁前
部を示す斜視図、第８図は両ハーフ組付け後の要
部の斜視図、第９図は第６図の−断面図、第
１０図は第６図左上の切欠き部に対応する下ハー
フ隅部の平面図である。 １……磁気テープカセツト、２……上ハーフ、
２ｂ……側壁、３……下ハーフ、４……カセツト
本体、５……磁気テープ、６……供給リール、７
……巻取りリール、８……前蓋、８ｄ……側板、
８ｆ……回動支持部、２０……回動支軸、２１…
…スプリング、２１ａ……一端、２１ｂ……他
端、２１ｃ……湾曲部、２４……凹部、２５……
薄壁、２６……切欠部、２６ａ……コーナー、２
７……係合突起、２９……前蓋係止部材、２９ｃ
……ロツク用突起、２９ｄ……解除用突起。 Figures 1 to 5 show an embodiment of the present invention, in which Figure 1 is a perspective view of the main parts of the upper half, Figure 2 is a cross-sectional view of Figure 3, and Figure 3 is a cross-sectional view of the upper half. Fig. 4 is a cross-sectional side view of the main part as seen from the inner side, Fig. 5 is a perspective view of the main part after both halves are assembled, and Figs. 6 to 10 are conventional Give an example,
Figure 6 is a partially cutaway rear view of the magnetic tape cassette seen from the lower half side, Figure 7 is a perspective view showing the front side wall of the upper half, and Figure 8 is a perspective view of the main parts after both halves are assembled. FIG. 9 is a cross-sectional view taken from FIG. 6, and FIG. 10 is a plan view of the lower half corner corresponding to the upper left notch in FIG. 6. 1... Magnetic tape cassette, 2... Upper half,
2b...Side wall, 3...Lower half, 4...Cassette body, 5...Magnetic tape, 6...Supply reel, 7
...Take-up reel, 8...Front cover, 8d...Side plate,
8f...Rotation support part, 20...Rotation support shaft, 21...
...Spring, 21a...One end, 21b...Other end, 21c...Curved portion, 24...Concave portion, 25...
Thin wall, 26...notch, 26a...corner, 2
7... Engaging protrusion, 29... Front lid locking member, 29c
...Lock protrusion, 29d...Release protrusion.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 上ハーフ２と下ハーフ３とでカセツト本体４を
形成し、該上ハーフ２の側壁２ｂ前部に、カセツ
ト本体４の前部に開閉可能に装着される前蓋８の
側板８ｄに延設した回動支持部８ｆが配設される
凹部２４を形成すると共に、該凹部２４が形成さ
れる薄壁２５に、上ハーフ２の前部側と下ハーフ
３側を開口した切欠部２６を形成し、該切欠部２
６のコーナー２６ａに、前蓋８の前記回動支持部
８ｆに設けた回動支軸２０を支承せしめ、該回動
支軸２０に装着したスプリング２１により前記前
蓋８を常時閉方向へ付勢した磁気テープカセツト
において、前記スプリング２１を、一端２１ａが
回動支軸２０に係止され、他端２１ｂが上ハーフ
２前部内面に摺動可能に圧接され、一端２１ａと
他端２１ｂとの間に下ハーフ３側に膨出する湾曲
部２１ｃを有する板ばねで形成し、前記凹部２４
の前部側に、上ハーフ２に下ハーフ３を組付ける
前に前記回動支軸２０と係合して該回動支軸２０
の上ハーフ２の前部側への移動を規制する係合突
起２７を、前記薄壁２５から下ハーフ３側へ向け
て突設したことを特徴とする磁気テープカセツ
ト。 The upper half 2 and the lower half 3 form a cassette body 4, and a recess 24 is formed in the front of the side wall 2b of the upper half 2, in which a rotation support portion 8f is disposed. The rotation support portion 8f is extended from a side plate 8d of a front cover 8 that is attached to the front of the cassette body 4 so as to be able to open and close. A cutout portion 26 that opens to the front side of the upper half 2 and the lower half 3 side is formed in a thin wall 25 in which the recess 24 is formed.
In the magnetic tape cassette, a pivot shaft 20 provided on the pivot support portion 8f of the front cover 8 is supported on the corner 26a of the recess 24. The front cover 8 is constantly biased in a closing direction by a spring 21 attached to the pivot shaft 20. The spring 21 is formed of a leaf spring having one end 21a engaged with the pivot shaft 20 and the other end 21b slidably pressed against the inner surface of the front part of the upper half 2, and having a curved portion 21c between the one end 21a and the other end 21b that bulges out towards the lower half 3.
Before the upper half 2 and the lower half 3 are assembled, the front side of the
a projection 27 for restricting the forward movement of the upper half 2 projects from said thin wall 25 towards the lower half 3.