JPH0138832Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a push switch mechanism.

1 and 2 show a relatively large conventional push switch mechanism, in which a long main guide shaft B and a short sub guide shaft C are protruded from the back surface of a push button A. On the other hand, a guide hole F into which the above-described main guide shaft B is inserted and a hole G into which the sub-guide shaft C is inserted are formed in the bottom plate portion E of the recessed portion of the base D. The main guide shaft B of the push button A has a return spring H.
A stop washer I is inserted into the guide hole F through the main guide shaft B, and a stop washer I
are fitted, and the sub guide shaft C is inserted into the hole G. In the figure, J is a switch that is opened and closed by the main guide shaft B.

3 and 4 show another conventional example in which a long guide shaft B is protruded from the center of the back surface of a push button A, and the inner peripheral surface of a recess K of a base D is provided on the outer peripheral surface of the push button A.
Guide projections L ₁ , L ₂ , L ₃ , L ₄ , L ₅ that come into contact with Ka,
L ₆ is formed, and the push button A guide shaft B is inserted into the guide hole L formed in the bottom plate part E of the recess K via the return spring H, and the tip of the guide shaft B protrudes from the back surface of the bottom plate part E. A lock washer I is fitted to the top.

5 and 6 show still another conventional example, in which a horizontal shaft M is provided on one side of the push button A, and a guide shaft B is provided protruding from the center of the back surface on the opposite side to the horizontal shaft M. Horizontal axis M
is rotatably pivoted to a bearing N formed in the base D, and a guide shaft B is inserted into a guide hole O formed in the base D via a return spring H, and P is a cover.

The degree of freedom of movement of the flat push button A will now be explained with reference to FIG. 11. This type of pushbutton A only allows movement in the Z-axis direction of the drawing, and allows for parallel movement in the X- and Y-axis directions and rotation (tilt) Rx, Ry, and Rz around the respective axes with high accuracy. A structure that is regulated and does not hinder movement in the Z-axis direction is required. In particular, in the case of a relatively large push button A, it is necessary to ensure that the button A moves only in the Z-axis direction even when a corner of the button A is pressed.

Therefore, in the conventional examples shown in Figs. 1 and 2, the movements in the X, Y, Rx, and Ry directions are regulated by the main guide shaft B, and the inclination in the Rz direction is controlled by the sub guide shaft C and the guide hole. It is regulated by G.

In addition, in the conventional examples shown in FIGS. 3 and 4, movements in the X-axis direction, Y-axis direction, and Rz are controlled by the guide protrusions L ₁ to _{L 6}
The movement in the Ry direction and the Rx direction is regulated by the guide protrusions L ₁ to L ₆ , the inner circumferential surface Ka, and the guide L, respectively.

Furthermore, in the conventional examples shown in FIGS. 5 and 6, X,
Movement in each of the Y, Z, Rx, and Rz directions is regulated by the horizontal axis M and the bearing N, and movement in the Ry direction about the horizontal axis M is approximately replaced by movement in the Z-axis direction.

However, in the conventional example shown in FIGS. 1 and 2, since the main guide shaft B is provided at a position offset from the center of the push button A, when the part A in the figure is pressed, the main guide shaft B The frictional force between the shaft B and the guide hole F increases, resulting in a poor feel, and in extreme cases, the push button A may not descend when the A part is pressed. In addition, when the main guide shaft B is arranged near the center, sufficient pinching with the sub guide shaft C cannot be obtained, which may cause tilting play in the Rz direction and impair the sense of precision.

In addition, in the conventional examples shown in FIGS. 3 and 4, the distances between the protrusions L ₁ and L ₂ , L ₃ and L ₄ , and L ₅ and L ₆ must be large, so that the distance between them and the inner peripheral surface Ka is increased. Due to mass production management, it was not possible to make the clearance small enough.
It is not possible to sufficiently suppress tilting and rattling in all directions. Moreover, when the push button A is molded from plastic, the mold dividing surface becomes the sliding surface of the protrusions _L1 to _L6 , which causes problems such as deterioration of the feel due to the influence of burrs.

Furthermore, in the conventional examples shown in FIGS. 5 and 6, the distance between the pushing part A' of the push button A and the horizontal axis M is insufficient, especially in the case of the push button A having a large width. Then, during operation, a tilt occurred and I felt something strange.
In order to prevent this, a large amount of space is required in the horizontal direction, especially when the pushbuttons A are arranged in parallel.
It was extremely difficult to use.

Therefore, the present invention attempts to solve the above-mentioned drawbacks, and includes a guide shaft protruding from the center of the push button, a pair of sub-guide shafts protruding from both sides of the guide shaft,
A reference hole formed on the base into which the leading shaft of the main guide shaft can be freely inserted, and a first hole which can be freely inserted into the base shaft of the main guide shaft.
and a second elongated hole into which the sub-guide shaft can be inserted, and the long axes of the first elongated hole and the second elongated hole are formed to be orthogonal to each other. Therefore, it is an object of the present invention to provide a push switch mechanism with good feel and precision.

Hereinafter, the present invention will be explained based on the embodiments shown in the drawings. Fig. 7 A, B, C, and D are cross-sectional views and plan views showing each component of the push switch mechanism according to the present invention, and Fig. 8 , 9 and 10 respectively show longitudinal sectional views of the same push switch mechanism at different positions during assembly.

In the above drawings, reference numeral 1 denotes a flat push button, and a cylindrical main guide shaft 2 is protruded from the center of the back surface of the push button 1, and a pair of sub guide shafts 3a are provided on both sides of the main guide shaft 2. , 3b are provided protrudingly.
The main guide shaft 2 has a large diameter base portion 2a.
and a small-diameter front shaft portion 2b. 4 is a cover.

Reference numeral 5 denotes a base, and a recess 6 having a planar area somewhat larger than the planar shape of the push button 1 is formed in the base 5. And, in the bottom part 7 of this recessed part 6,
A main guide hole 8 into which the main guide shaft 2 can be inserted is formed in the center, and elongated holes 9a and 9b into which the sub guide shafts 3a and 3b can be inserted on both sides thereof. The main guide hole 8 is made up of an elongated hole 10 into which the base shaft portion 2a of the main guide shaft 2 is inserted, and a circular reference hole 11 into which the tip shaft portion 2b is inserted. And the long hole 1 above
0 and the long axes of the elongated holes 9a and 9b for the sub guide shafts 3a and 3b are formed so as to be orthogonal to each other, and in the drawing, the long axes of the elongated holes 10 are directed in the The long axis of 9b is oriented in the Y direction. 8
12 is a return spring, 13 is a stop washer, and 14 is a switch.

Next, to explain the assembly of each of the above parts, first, the main guide shaft 2 and the sub guide shafts 3a, 3b of the push button 1 are inserted into the main guide hole 8 and elongated holes 9a, 9b of the base 5, respectively. . Next, the stop washer 13 is fitted to the tip of the main guide shaft 2 protruding from the lower end of the main guide hole 8, and the base shaft portion 2 of the main guide shaft 2 is fitted.
a and the step 8a of the guide hole 8.
An upward elastic force is applied to the push button 1 through the above. The tip of the main guide shaft 2 is connected to the switch 14.
is in contact with.

Next, the above operation will be explained. When the push button 1 is pressed, the button 1 descends against the return spring 12, and the switch 14 is pressed down to close or open the switch. Therefore, the displacement of the push button 1 in the X direction is restricted only by the clearance in the X direction between the sub guide shafts 3a, 3b and the elongated holes 9a, 9b, and the displacement in the Y direction is restricted by the clearance between the base shaft 2a of the main guide shaft 2 and the long holes 9a, 9b. It is restricted only by the clearance of the hole 10 in the Y direction. or,
The inclination Rz around the Z axis is defined by the sub guide shafts 3a, 3b, the elongated holes 9a, 9b, and the pitch _L1 between them. Furthermore, the inclination Rx around the X-axis and the inclination Ry around the Y-axis are respectively
Clearance between a and the elongated hole 10, and the sub guide shaft 3
a, 3b and the elongated holes 9a, 9b, the clearance between the front shaft portion 2b of the main guide shaft 2 and the reference hole 11, and the distance _L2 between the two in the Z-axis direction.

In the above embodiment, the main guide shaft 2 and the sub guide shafts 3a, 3b are cylindrical, but they may also be prismatic, for example, and in this case, the elongated holes 9a, 9b
and 10 have a shape that only restricts either the X direction or the Y direction. Further, the switch 14 is opened and closed by the main guide shaft 2.
An operating shaft for the switch 14 may be provided separately. Furthermore, a stop washer 13 is attached to the lower end of the main guide shaft 2.
The main guide shaft 2 is fitted to prevent it from coming off.
An easily deformable locking claw is provided at the lower end of the main guide hole 8 or the lower end of the sub guide shafts 3a, 3b, and the locking claw is configured to abut against the lower surface of the main guide hole 8 or the back surface of the bottom surface portion 7. It's okay.

As mentioned above, the present invention consists of a push button 1 for opening and closing a switch 14 and a base 5, and in the center of the push button 1 is a main guide shaft 2 consisting of a base shaft portion 2a and a tip shaft portion 2b. A pair of sub guide shafts 3 on both sides
a, 3b, and the base 5 has a first elongated hole 10 into which the base shaft portion 2a of the main guide shaft 2 can be inserted, and a tip shaft portion 2.
The reference hole 11 through which b passes through, and the sub guide shafts 3a, 3
Since the long axes of the first elongated hole 10 and the second elongated holes 9a and 9b are orthogonal to each other, the X, Y Since the directional position is regulated only by the clearance of the elongated holes 9a, 9b, and 10, misalignment and rattling can be minimized. In addition, since the long axes of the first elongated hole 10 and the second elongated holes 9a and 9b are configured to be orthogonal to each other, even if the respective clearances are reduced, interference due to mutual misalignment may occur. I never get nervous. Furthermore, since the main guide shaft 2 is located at the center of the push button 1, it operates smoothly even when the end of the push button 1 is pressed. or,
Since the pitch between the sub-guide shafts 3a and 3b can be set to the full length of the push button 1, Rz
The directional inclination is also very small. In particular, the main guide shaft 2 can have a large dimension _L2 regardless of the length of the return spring 12 due to the base shaft portion 2a and the tip shaft portion 2b, so that the inclination in the Rx and Ry directions can be minimized. In addition, if the push button 1 and the base 5 are molded from plastic, even if L ₂ of the main guide shaft 2 is lengthened or the draft angle is provided as necessary for molding,
There is no increase in wobbling or tilting.

[Brief explanation of the drawing]

1, 3, and 5 are perspective views of the conventional push switch mechanism before assembly, respectively.
1, 3 and 6 respectively.
Figure 7 shows a cross-sectional view after assembly, and Figures 8, 9, and 10 are respectively sectional views and plan views of the components of the push switch mechanism according to the present invention.
The figures are longitudinal sectional views taken at different positions when the push switch mechanism is assembled, and FIG. 11 is a diagram for explaining the degree of freedom of the push button. 1...Push button, 2...Main guide shaft, 2a...
Base shaft part, 2b... Tip shaft part, 3a, 3b... Sub guide shaft, 5... Base, 9a, 9b, 10... Long hole,
11...Reference hole.

Claims (1)

[Claims for Utility Model Registration] (1) The switch consists of a push button for opening and closing, and a base. In the center of the push button is a main guide shaft consisting of a base shaft and a tip shaft, and on both sides there are a pair of guide shafts. A sub-guide shaft is provided, and the base has a first elongated hole into which the base shaft portion of the main guide shaft can be inserted, a reference hole through which the tip shaft portion passes, and a second elongated hole into which the sub-guide shaft can be freely inserted. The push switch mechanism is configured such that the long axes of the first elongated hole and the second elongated hole are orthogonal to each other. (2) Registration of a utility model in which the base shaft of the main guide shaft is formed to have a larger diameter than the tip shaft, and a return spring that biases the push button upward is interposed between the base shaft and the base. A push switch mechanism according to claim 1.