JPH064981U - Magnetic tape cassette - Google Patents

Abstract

(57) [Abstract] [Purpose] In a magnetic tape cassette equipped with a slide plate that opens and closes an opening formed in the front part of the bottom surface of a housing, a spring for urging the slide plate is engaged with a spring engagement part. To be able to do smoothly. [Structure] A spring retaining portion 21 having a substantially hook-shaped cross section is provided at the center of the front end of the back surface of the slide plate 16. The surface 26a of the tip end portion 26 of the spring retaining portion 21 is formed by an inclined surface that inclines toward the recess 23. When the spring 22 is bent in the direction opposite to the urging force direction B and is hooked in the recess 23 so as to straddle the spring hooking portion 21, the spring 22 causes the surface to move by the urging force.
Even if it abuts against 26a, the spring 22 will not be able to
Since it is guided to the recess 23 while sliding along the a, the work of locking the spring 22 can be smoothly performed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a magnetic tape cassette, and more particularly to a magnetic tape cassette in which an opening formed in a front portion of a bottom surface of a housing is opened and closed by a slide plate.

[0002]

[Prior art]

 For example, at the front of the bottom of the housing of a magnetic tape cassette containing a high-density magnetic recording tape called DAT (Digital Audio Tape), the tape drawer on the cassette deck side when this magnetic tape cassette is loaded into the cassette deck The means is inserted to form an opening for pulling out the magnetic recording tape. However, when such an opening is formed, the magnetic recording tape may be damaged or soiled.

Therefore, in order to prevent such a trouble, a slide plate for opening and closing such an opening is provided on the bottom surface of the housing of the above magnetic tape cassette. Normally, this slide plate is biased by a spring in the direction to close the opening, and when the magnetic tape cassette is loaded in the cassette deck, it is opened by the opening / closing means on the magnetic tape cassette side.

A conventional slide plate of such a magnetic tape cassette is provided with a spring hooking portion formed on its back surface and having a substantially hook-shaped cross section for hooking a spring.

[0005]

[Problems to be solved by the device]

 When assembling the magnetic tape cassette provided with the slide plate as described above, it is necessary to carry out a hooking work for locking the spring to the spring hooking portion. This hooking work involves bending the spring in the direction opposite to the direction of the urging force in a narrow space to temporarily straddle the spring hooking part and then hooking it on this spring hooking part. Was not good. In order to smoothly carry out this hooking work, it is known that the shape of the spring hooking portion is devised, as disclosed in, for example, Japanese Utility Model Publication No. 2-40636.

As shown in FIG. 5, which is a vertical cross-sectional view showing the structure of a conventional spring hooking portion, the invention disclosed in the above publication discloses that the spring hooking portion 1 is formed in a hook shape in cross section and slides. It is provided on the edge of the back surface 3 of the plate 2. Then, when the spring 4 is bent in the direction opposite to the direction A of the urging force so as to straddle the tip of the spring retaining portion 1 once and then to engage with the recess 5 of the spring retaining portion 1, The front surface 1a of the spring retaining portion 1 over which the spring 4 rides is formed by an inclined surface.

As described above, the invention disclosed in the above publication makes it possible to smoothly carry out the spring locking work by forming the front surface portion 1a of the spring locking portion 1 by the inclined surface.

By the way, as shown in FIG. 5, while the spring 4 is hooked in the recess 5 of the spring hooking portion 1, a force for always returning to the direction A acts on the spring 4. Therefore, if the surface 1b of the front end of the spring retaining portion 1 against which the spring 4 abuts due to its biasing force is a vertical surface, the spring 4 may be caught on this surface 1b, and the spring 4 is retained. It can be a factor that hinders smooth work.

In view of the above problems, the present invention works to lock a spring for urging a sliding plate so as to close an opening at a front part of a bottom surface of a housing to a spring locking part provided on a back surface of the sliding plate. It is an object of the present invention to provide a magnetic tape cassette which facilitates the assembling work and thereby facilitates the assembling work.

[0010]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the magnetic tape cassette according to the present invention has an opening formed in the front part of the bottom surface for housing the hub around which the magnetic recording tape is wound and for pulling out the magnetic recording tape. A housing, a slide plate slidably provided on the bottom surface of the housing and opening / closing the opening of the housing, and a slide plate provided in the housing, the slide plate sliding in the direction of closing the opening. A magnetic tape cassette comprising a spring for urging a plate, a spring hook formed on the back surface of the slide plate, the spring hook having a substantially hook-shaped cross section and having a recess for hooking the spring. The surface of the tip end portion of the spring retaining portion with which the spring comes into contact by the biasing force of the spring is inclined so as to guide the spring toward the recess. It is those that.

[0011]

[Action]

 In the magnetic tape cassette according to the present invention described above, the inclined surface of the spring retaining portion provided with the recess for retaining the spring for urging the slide plate contacts the spring by the urging force. Guide towards the recess of the stop. Therefore, when the spring is locked in the recess of the spring locking portion, the spring does not catch on this contact surface, and the locking work of the spring can be performed smoothly.

[0012]

【Example】

 An embodiment of a magnetic tape cassette according to the present invention will be described below with reference to the drawings.

FIG. 1 is a view showing a mounting structure of a spring for urging a slide plate of a magnetic tape cassette according to a first embodiment of the present invention. FIG. 1A is an external perspective view and FIG. Is an enlarged vertical sectional view taken along the line Ib-Ib in FIG. 1 (a), FIG. 2 is an external perspective view showing the magnetic tape cassette according to the first embodiment of the present invention, and FIG. FIG. 3B is a perspective view of the bottom surface side with the slide plate opened, and FIG. 3C is a perspective view of the slide plate.

As shown in FIG. 2 (a), the magnetic tape cassette 11 of this embodiment has a hub 13 in which a magnetic recording tape 12 is wound in a housing 14. As shown in FIG. 2B, an opening 15 is formed in the front part of the bottom surface of the housing 14 for drawing out the magnetic recording tape 12 hung on the front surface of the housing 14. A slide plate 16 that opens and closes the opening 15 is provided on the bottom surface of the housing 14, and a lid 17 that opens and closes the front side of the opening 15 is provided on the front surface of the housing 14.

Both ends in the length direction of the lid 17 are rotatably supported by both side surfaces of the housing 14 in the left-right direction, and the front side of the opening 15 is opened and closed. As shown in FIG. 2 (c), engaging portions 19 extending in the front-rear direction are formed on the inner surfaces of the walls 18 at both ends in the left-right direction of the slide plate 16. (4) Engages with engaging grooves 20 formed in both left and right side surfaces of the housing 14 and extending in the front-rear direction. Then, as shown in FIG. 2B, the slide plate 16 slides in the front-rear direction of the housing 14 to open and close the opening 15.

As shown in FIGS. 1 (a) and 1 (b), a spring hooking portion 21 having a substantially hook-shaped cross section is provided at the center of the front end of the back surface of the slide plate 16. The stopper 21 includes a recess 23 for retaining the spring 22. The winding portion 22a of the spring 22 is held by a cylindrical holding portion 24 formed on the back surface of the housing lower panel 14a that forms the lower portion of the housing 16, and one end portion 22b extending from the winding portion 22a has the housing lower panel 14a. It is inserted in the hole 25 formed in the. The other end 22c of the spring 22 is hooked in the concave portion 23 of the spring hooking portion 21, whereby the spring 22 is fixed in the housing 14 and the slide plate 16 is fixed to the spring 22. It is urged in the urging force direction B.

As shown in FIG. 1 (b), when performing the latching work of latching the spring 22 in the recess of the spring retaining portion 21, the spring 22 is moved in the direction opposite to the urging force direction B thereof. While bending, it straddles the tip end portion 26 of the spring hooking portion 21 and is hooked in the recess 23. At this time, since the surface 26a of the tip end portion 26 of the spring retaining portion 21 is formed by the inclined surface which is inclined toward the recessed portion 23, when the ridge 22 comes into contact with the surface 26a by its urging force, the spring 22 The urging force causes the urging force to move toward the recess 23 while sliding on the surface 26a and to be hooked in the recess 23.

Further, in this embodiment, the lower surface 27 of the recess 23 of the spring hooking portion 21 is constituted by an upslope that rises from the back surface of the slide plate 16 toward the recess 23, so that the spring 22 is hooked. Even when the spring 22 comes into contact with the surface 27 during the stopping work, the spring 22 is slid on the surface 27 by its urging force and is retained in the recess 23.

The magnetic tape cassette according to the present invention has been described above based on the first embodiment, but the magnetic tape cassette according to the present invention is not limited to this embodiment.

For example, in the first embodiment, the position where the spring hook portion is provided is the center of the front end portion of the back surface of the slide plate, but the installation position of the spring hook portion is not limited to this. It is also possible to change to another position that can apply an appropriate biasing force to the slide plate.

As for the shape of the spring retaining portion, as shown in FIG. 3, which is a longitudinal sectional view showing the configuration of the spring retaining portion of the magnetic tape cassette according to the second embodiment of the present invention, The upper and lower surfaces of the recess 23 'of the 21' may be constituted by inclined surfaces 26a 'and 27', so that the spring 22 'can be hooked. Further, as shown in FIG. 4 which is a vertical cross-sectional view showing the structure of the spring retaining portion of the magnetic tape cassette according to the third embodiment of the present invention, the surface 26a of the tip portion 26 "of the spring retaining portion 21" is shown. ″ Is formed as a curved surface, and the lower surface 27 ″ of the recess 23 ″ is formed as a mountain-shaped inclined surface that goes down from the slide plate 16 ″ toward the recess, and this surface 27 ″ is a spring. It is also possible to make it the receiving surface of the spring 22 "when the 22" is hooked.

Further, the shapes of the housing, the slide plate, the spring and the like in the first embodiment can be appropriately changed according to the application.

[0023]

As described above, in the magnetic tape cassette according to the present invention, the surface of the tip end portion of the spring retaining portion against which the spring abuts due to its urging force is directed toward the recess for retaining the spring. Since it is inclined to guide, the spring does not get caught on the abutment surface of the tip of the spring retaining part when performing the spring retaining work, and the spring retaining work is smooth. It can be done, which makes it easier to assemble it.

[Brief description of drawings]

FIG. 1 is a view showing a mounting structure of a spring for urging a slide plate of a magnetic tape cassette according to a first embodiment of the present invention.

FIG. 2 is an external perspective view showing a magnetic tape cassette according to a first embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view showing a structure of a spring retaining portion of a magnetic tape cassette according to a second embodiment of the present invention.

FIG. 4 is a vertical cross-sectional view showing a structure of a spring retaining portion of a magnetic tape cassette according to a third embodiment of the present invention.

FIG. 5 is a vertical cross-sectional view showing the structure of a spring retaining portion of a conventional magnetic tape cassette.

[Explanation of symbols]

11 magnetic tape cassette 12 magnetic recording tape 13 hub 14 housing 15 opening 16, 16 ', 16 "slide plate 21, 21', 21" spring retaining part 22, 22 ', 22 "spring 23, 23', 23" Spring retaining part 26, 26 ', 26 "Tip of the spring retaining part 26a, 26a', 26a" A surface with which the spring abuts due to its biasing force.

Claims (1)

[Scope of utility model registration request] 1. A housing for accommodating a hub around which a magnetic recording tape is wound, the housing having an opening formed in the front portion of the bottom surface for pulling out the magnetic recording tape, and a slidably provided on the bottom surface of the housing. And a slide plate that opens and closes the opening of the housing, and a spring that is provided in the housing and that biases the slide plate in a direction in which the slide plate closes the opening, and has a substantially hook-shaped cross section. A magnetic tape cassette having a recess for holding the spring, the spring hook being provided on the back surface of the slide plate, wherein the spring at the tip of the spring hook is A magnetic tape cassette, wherein a surface that abuts by an urging force is inclined so as to guide the spring toward the recess.