JPH0755727Y2 - Magnetic tape cassette - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is found in a magnetic tape cassette equipped with a slider member, more specifically a magnetic tape cassette known as a DAT. The present invention relates to a magnetic tape cassette of a type provided with a slider member that is unlocked by a member and is slid and opened.

(Prior Art) A cassette containing a magnetic tape called DAT (Digital Audio Tape) is provided with a slider member 4 which is opened when the cassette 2 is loaded in a cassette deck, as shown in FIG. . The slider member 4 is biased in the closing direction (the direction of arrow A) by a spring (not shown) and is locked at a fixed position by a slider lock member 6, and when the cassette 2 is loaded in the cassette deck, Is released by sliding the slider lock in the direction of arrow B against the urging force of the spring by engaging with the release member of FIG. have.

As shown in FIGS. 4A to 4C, a device for receiving such a magnetic tape cassette, that is, a cassette deck, is provided with the slider member 4 of the cassette 2 when the cassette 2 is loaded.
The release groove 8 of the slider member 4 on the surface 10 facing the
Is provided with a rail-shaped releasing member 12 having a predetermined length, and the slider member 4 is released by the slider locking member 6 engaging with the releasing member 12 and the rail-shaped releasing member. Guided by 12, it slides in the opening direction (direction B) against the bias by the spring.

That is, as shown in FIG. 4A, the slider lock releasing groove 8 of the slider member 4 is provided with two holes 8a and 8b, and when the slider member 4 is in the closed position, it is in the locking direction (downward in the drawing). A spring-biased slider lock member 6 is fitted in the first hole 8a, and when the cassette 2 is loaded in the cassette deck in this state, on the surface 10 of the cassette deck facing the slider member 4. Release member 12 enters into the slider lock release groove 8 and
As shown in the figure, the release member 12 pushes up the slider lock member 6 to release it from the slider member 4, and allows the slider member 4 to slide in the opening direction. Then, when the cassette 2 is further pushed into the deck, the slider member 4 slides together with the release member 12 in the opening direction (direction B), and the slider lock member 6 moves the slider lock member 6 as shown in FIG. 4C. The slider member 4 is locked in the open position by being fitted into the second hole 8b of the lock release groove 8.

(Problem to be Solved by the Invention) The surface 6a of the slider lock member 6 that engages with the locking hole 8 of the slider member 4 is higher than the height of the locking hole 8 as shown in FIG. Since it has a slanted surface which is further away from the locking hole 8 as it goes downward (in FIG. 5), the position where the slider lock member 6 and the locking hole 8 come into contact with each other. Is an upper end 8a of the locking hole 8, which abuts on the way of the engaging surface 6a of the slider lock member 6.

Therefore, when the cassette 2 is loaded in the cassette deck and the slider lock member 6 is engaged with the release member 12 and pushed up, the slider lock member 6 is attached to the upper end 8a of the locking hole 8 of the slider member 4. It may get caught and cannot be reliably released.

In view of this point, the present invention has a cassette 2 on the cassette deck.
The slider lock member 6 and the release member 12
It is an object of the present invention to provide a magnetic tape cassette that can be reliably released without engaging the slider lock member 6 with the upper end 8a of the locking hole 8 of the slider member 4 when the slider lock member 6 is pushed up. Is.

(Means for Solving the Problems) The magnetic tape cassette according to the present invention is the above-mentioned magnetic tape cassette, wherein
The surface of the slider member that engages with the locking hole has a contact point that contacts the wall surface of the locking hole at a position lower than the height of the locking hole, and an inclined surface that extends downward from this contact point. It is characterized by having.

(Operation and effect) In the magnetic tape cassette of the present invention, the contact point between the slider lock member and the slider member is located lower than the height of the locking hole, and the slider lock member extends downward from this contact point. Since the slider lock member has a slanted surface, the slider lock member does not get caught in the locking hole of the slide member and cannot be released when releasing the slider lock member, and the slider lock member can always be reliably released. It is something to do.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing a locked state of a slider lock member 16 and a slide member 14A of a magnetic tape cassette according to a first embodiment of the present invention.

A surface of the slider lock member 16 that engages with the locking hole 18a of the slider member 14A has a contact point 16b that contacts the wall surface of the locking hole 18a at a position lower than the height of the locking hole 18a, It has an inclined surface 16a extending downward from the contact point 16b.

The contact point 16b is located at a position lower than the height of the locking hole 18a, and the slider lock member 16 has an inclined surface 16a extending downward from the contact point 16b, so that the slider lock member 16 is released. At this time, the slider lock member 16 does not get caught in the locking hole 18a of the slide member 14 and can always be reliably released.

FIG. 1B is a sectional view showing a locked state of the slider lock member 16 and the slide member 14B of the magnetic tape cassette according to the second embodiment of the present invention.

In this embodiment, the wall surface 18 of the locking hole of the slider member 14A is
a'is inclined along the inclined surface 16a of the slider lock member 16, and even in this case, since the contact point 16b is located at a position lower than the height of the locking hole, When the lock member 16 is released, the slider lock member 16 does not get caught in the locking hole 18a 'of the slide member 14 and can always be released reliably.

FIG. 1C is a sectional view showing a locked state of the slider lock member 16 and the slide member 14B of the magnetic tape cassette according to the third embodiment of the present invention.

In this embodiment, the wall surface 18 of the locking hole of the slider member 14A is
The upper portion of a ″ is inclined along the inclined surface 16a of the slider lock member 16, and the lower portion 18c is inclined in the opposite direction. Even in this case, the contact point 16b is Since it is located at a position lower than the height of the locking hole, the slider locking member 16 does not get caught in the locking hole 18a ″ of the slide member 14 when the slider locking member 16 is released, so that the slider locking member 16 can always be reliably released. .

Further, in this case, the oppositely inclined surface 18c is provided so that the slide lock releasing member 16 once released is again provided with the engaging hole 18c.
Since the head of the slide lock releasing member 16 is guided by the outer inclined surface 18c when it is fitted into the a ″, there is an advantage that it is easy to fit.

FIG. 2 shows details of the specific shape of the slider lock releasing member 16 in each of the above embodiments.

As shown in FIG. 2, this slide lock releasing member 16
Indicates a frontal head surface 16d inclined by 45 ° with respect to a front end surface 16c substantially parallel to the movement direction of the slider lock releasing member 16 indicated by an arrow.
And rear head surfaces 16e ', 16e "that are inclined by approximately 90 ° with respect to the frontal head surface 16d that is offset in two steps across the step portion 16f, and the lower ends of the rear head surfaces 16e', 16e" It has an inclined surface 16a which is inclined downward from the contact point 16b slightly to the front from the vertical.

According to the slider lock release member of this shape, the head is tilted 45 ° both forward and backward, so that it can be released and locked securely without being caught by other members during release and locking. You can

[Brief description of drawings]

1A, 1B and 1C are enlarged cross-sectional views of a slider lock member of a magnetic tape cassette according to the present invention and various embodiments of the shape of the slider member, and FIG. 2 is the slider unlock member in each of the above embodiments. FIG. 3 is an enlarged view showing the details of the shape of FIG. 3, FIG. 3 is a perspective view showing the entire magnetic tape cassette to which the present invention is directed, and FIGS. 4A, 4B and 4C show the slider member and slider lock member when the cassette is loaded. FIG. 5 is a sectional view for explaining the movement together with a change in the relative position with respect to the slider lock releasing member on the cassette deck side, and FIG. . 2 ... Magnetic tape cassette 4,14A, 14B, 14C ... Slider member 6, 16 ... Slider lock member 16a ... Inclined surface, 8a, 18a ... Locking hole 12 ... Slider lock release member

Claims (1)

[Scope of utility model registration request] 1. A lock mechanism is provided which is slidable between two positions, a closed position and an open position separated from the closed position, and which has two locking holes which can be engaged with one slider lock member. A slider member that is selectively held at the two positions by engaging one of the two locking holes with the slider lock member, and is provided on the cassette deck when loaded in the cassette deck. A magnetic tape cassette capable of sliding between the two positions of the slider member by releasing the engagement between the slider lock member and the locking hole by the lock releasing member, A surface of the slider member that engages with the engaging hole has an abutting point at a position lower than the height of the engaging hole to abut a wall surface of the engaging hole, and an inclination extending downward from the abutting point Face A magnetic tape cassette characterized by having.