JPH0426606Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a latch device for electric appliances such as microwave ovens and furniture such as cabinets, in which a latch pawl that is rotatably pivoted is brought into an engaged state. It relates to a holding device.

[Conventional technology]

For electrical appliances such as microwave ovens and fixtures such as cabinets, which have movable bodies such as doors and drawers attached to the main body, a latch device is provided to lock the movable body such as the door to the main body. For example, a door latch device for a microwave oven is conventionally constructed as shown in FIGS. 9 and 10.

That is, a pin 4 is inserted into a hollow portion near the free end of the door 1 so that the latch pawl 3 can be moved up and down via a support piece 2a cut and formed on the frame 2 of the door 1.
The base end of the latch pawl 3 is attached to the support piece 2a.
The latch pawl 3 and the frame 2 are brought into contact with a stopper 7 projecting sideways so that the latch pawl cannot be rotated downward from a horizontal position, and the latch pawl 3 and the frame 2
A tension spring 5 is installed between the latch pawl 3 and the tension spring 5 to bias the latch pawl 3 downward, so that the engaged state of the latch pawl 3 can be maintained. By forming an inclined guide surface on one or both of the parts, the latch pawl 3 can escape and rotate against the force of the spring 5. 3 is configured to be engaged by cutting.

[Problem that the invention attempts to solve]

However, if the coil spring 5 is used as a means for holding the latch pawl 3 in the engaged state in this way, one end of the coil spring 5 will be locked in a part away from the latch pawl, so This requires a considerable amount of space, making it impossible to make the latching device more compact. In addition, a locking means for the coil spring 5 must be formed separately between the latch pawl and the frame 2, which complicates the shape of the members and makes machining difficult. Furthermore, when assembling the latching device, both ends of the coil spring must be manually latched, making it impossible to improve assembly efficiency.

In addition, in addition to the time-consuming processing and assembly of the above-mentioned parts, the coil spring itself is quite expensive, which makes it difficult to reduce the cost of the latch device. There were also problems such as an abnormal noise being made every time the latch pawl was engaged or disengaged.

The present invention aims to solve the above-mentioned problems by using an elastic plate such as a leaf spring instead of a coil spring as a means for biasing the latch pawl.

[Means for solving problems]

Therefore, in the present invention, an engaging portion is provided on either one of the movable body such as a door and the main body to which the movable body is attached.
A latch device is provided with a latch pawl rotatably attached to the other side, and the latch pawl is configured to be slidable into and engaged with the engaging portion, and the pivot portion of the latch pawl and the corresponding A biasing body formed by bending an elastic plate into a substantially U-shape is provided between the movable body or the main body to which the latch claw is attached, and the tips of both protruding pieces of the biasing body are used to secure the latch claw. In addition to sandwiching the outer peripheral surface of the pivoting part, the flat back surface of the biasing body is in close contact with the movable body or the main body to which the latch claw is attached.

[Functions and effects of the idea]

In this configuration, the biasing body is held in such a way that it cannot fall off by sandwiching the latch claw between its two protruding pieces, while the flat back surface of the biasing body is in close contact with the door, main body, etc. In order to rotate the latch pawl in the disengagement direction, both protruding pieces must be elastically deformed, and both protruding pieces elastically resist the rotation of the latch pawl in the disengagement direction. Therefore, the latch pawl is maintained in the engaged state.

In this way, in the present invention, the biasing body for holding the latch pawl in the engaged position is disposed between the base end of the latch pawl and the door, main body, etc. to which the latch pawl is attached. Since it does not protrude outside the latch pawl, the latch device can be made compact, and the biasing body can be attached without falling off due to its own elastic force, and there is no need to provide a separate locking means, so the structure can be improved. This makes it possible to simplify, reduce the labor involved in machining parts, and speed up assembly work. In addition, the biasing body can be manufactured at low cost by bending an elastic body such as spring steel into a substantially U-shape.
The manufacturing cost of the latch device can be reduced, and since the elastic plate is biased using the elastic force generated by the bending deformation, no sound is generated during the elastic deformation, so the spring noise that accompanies the engagement and disengagement of the latch pawl is generated. It also has the effect of reliably preventing.

〔Example〕

Next, an example in which the present invention is applied to a microwave oven door latch device is shown in the drawings (Figures 1 to 8).
To explain this, in the figure, reference numeral 10 denotes a door whose one side is pivoted to the microwave oven body 11 so as to be horizontally rotatable, and the door 10 is formed in a hollow shape with a frame 12 having a rectangular L-shaped cross section as its core. has been done.

Reference numerals 13 and 13 denote latch devices disposed in the hollow portion near the free end of the door 10, and each latch device 1
3 is composed of a latch pawl 14 with an engaging portion 14a projecting backward from the inner surface of the door 10, and a biasing body 15 attached to the base end of the latch pawl 14. Of these, the latch claw 14 has its base end 14b
The side plate 12a of the frame 12 and the frame 12
The pin 16 is pivotally mounted to be vertically movable via a support piece 12c cut and formed on the substrate 12b, and
A stopper 17 horizontally protrudes from the support piece 12c.
By bringing the outer surface of the proximal end into contact with the base end, it is possible to rotate only upward from a horizontal state. In this case, by positioning the head of the pin 16 between the side plate 12a of the frame and the side plate 10a of the door cover, the pin 16 cannot be removed.

On the other hand, the biasing body 15 is formed by bending an elastic plate such as spring steel into a substantially U-shape.
The tips of both the upper and lower protruding pieces 15a and 15b hold both the upper and lower surfaces of the pivoting part of the latch pawl 14, and
The flat back portion 15c is connected to the frame substrate 12.
Place it in close contact with b. In this case, the tip abutting portion of the upper protruding piece 15a is located closer to the tip of the latch pawl 14 by an appropriate dimension (l) than the rotation axis of the latch pawl 14, and the tip abutting portion of the lower protruding piece 15b is positioned closer to the tip of the latch pawl 14 than the rotation axis of the latch pawl 14. The protruding dimensions of each of the protruding pieces 15a and 15b are set so that they are located slightly closer to the proximal end than the rotation axis of the latch pawl 14, and the pivoting lower surface 14b of the latch pawl 14 is tilted upward toward the proximal direction. It is formed on a sloped surface. Also,
Protrusions 14c, 14 are provided on the upper and lower surfaces of the latch claw 14.
d is provided to prevent the protruding pieces 15a, 15b from shifting beyond a certain level when the latch pawl 14 rotates.

Moreover, inside the microwave oven main body 11, there are 6th to 7th
A plate 18 having an L-shaped cross section as shown in the figure is attached, and a guide surface 1 is attached to the front plate 18a of the plate 18.
An engaging portion 19 with 9a is formed. The plate 18 is provided with limit switches 21, 22, 23 having a function such as a safety switch. - It is configured to be turned off.

In the above configuration, the biasing body 15 holds the pivoting portion of the latch pawl 14 with its upper and lower projecting pieces 15a and 15b, while bringing the flat back surface portion 15c into close contact with the frame board 12b. 1
4 rotates upward, both the upper and lower protruding pieces 15a and 15b are elastically deformed, and the latch pawl 14 is urged to its original horizontal state by the elastic force. When the latch pawl 14 closes and rotates, the latch pawl 14 engages the engaging portion 19 in the same manner as in the conventional case.
This will result in a sharp engagement. That is, when the tip of the latch pawl 14 comes into contact with the guide surface 19a of the engaging portion 19, the latch pawl 14
5b, the locking portion 14a passes the guide surface 18a, and at the same time is rotated downward by the elastic force of the upper and lower bending pieces 15a, 15b. 14a is the engaging part 19
will be engaged in.

The locking portion 14a of the latch pawl 14 can be tilted forward to lock the door 1 with a force above a certain level.
When 0 is pulled, the latch pawl 14 escapes upward and rotates to release the engagement.

To assemble the above-mentioned latch device 13, first, the biasing body 15 is attached to the side plate 12a of the frame 12 and the support piece 1.
2b, then insert the latch pawl 14 and pivot the pin 16.

As described above, the biasing body 15 is installed between the latch pawl 14 and the frame 12, and requires almost no installation space.
In addition, since the biasing body 15 is attached using its own elastic force and there is no need to provide a separate locking means, the structure of the members constituting the latch device can be simplified, the processing effort can be reduced, and This makes it possible to speed up assembly work.

In this case, as in the embodiment, each of the upper and lower protruding pieces 15
If the abutting points of a and 15b are located on the opposite side across the rotational axis of the latch pawl 14, a moment will be applied to the latch pawl 14 to rotate it downward even when it is in a horizontal position. 14 in the engaged state.Furthermore, when the lower surface 14b of the proximal end of the latch claw 14 is inclined, the elastic force of the lower protruding piece 15b also acts in the horizontal direction, so that the rear surface Since it acts to press the biasing body 15c against the frame substrate 12b, there is an advantage that the posture of the biasing body 15 can be maintained more reliably.

Although the above embodiment was applied to a door latch device for a microwave oven, the scope of application of the present invention is not limited to this, but the present invention is applied to a door latch device for other electrical appliances, and for furniture such as a cabinet. It can be widely applied to latch devices for locking movable bodies to the main body of various types of equipment and fixtures, such as door and drawer latch devices, in which movable bodies are rotatably or slidably attached to the main body. It is.

[Brief explanation of drawings]

1 to 8 show an embodiment of the present invention, in which FIG. 1 is an exploded perspective view of a latch device, FIG. 2 is a perspective view of a microwave oven, FIG. 3 is a cross-sectional view of FIG.
The figure is a cross-sectional view of FIG. 3, FIG. 5 is a cross-sectional view of FIG. 4, FIG. Fig. 8 is a diagram showing the action, Fig. 9 is a perspective view of the figure.
10 show the prior art, FIG. 9 is a partial plan view of a microwave oven, and FIG. 10 is a cross-sectional view taken from the side of FIG. 9. 10...Microwave oven door, 11...Microwave oven body, 14...Latch claw, 14a...Engaging portion, 1
5...Biasing body, 15a...Upper protruding piece, 15b...
Lower protruding piece, 15c... Flat back surface portion, 16... Pin, 19... Engaging portion, 19a... Guide surface.

Claims (1)

[Claims for Utility Model Registration] (1) A movable body such as a door and a main body to which the movable body is attached, an engaging portion being provided on one side and a latch pawl rotatably pivoted on the other side. In the latching device, the latch pawl is configured to be able to be inserted into and engaged with the engaging portion, and the latch pawl is provided with a pivot portion of the latch pawl and the movable body or main body to which the latch pawl is attached. , a biasing body formed by bending an elastic plate into a substantially U-shape is provided, and the tips of both protruding pieces of the biasing body sandwich the outer peripheral surface of the pivoting part of the latch pawl, and the biasing body A latch pawl biasing device for a latch device, characterized in that a flat plate-like rear portion of the body is brought into close contact with the movable body or main body to which the latch pawl is attached. (2) The tip of one of the two protruding pieces of the biasing body is positioned closer to the tip of the latch pawl than the rotation axis of the latch pawl, while the tip of the other protrusion is positioned closer to the rotation axis of the latch pawl. A latch pawl biasing device in a latch device according to claim 1, characterized in that the latch pawl is located at the same position as or closer to the proximal end.