JPH0351863Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mounting structure for a button for driving a switch mounted on a circuit board of a telephone or the like.

About the conventional button mounting structure of this type
In the structure proposed in No. 57-86092, a button for driving a switch mounted on a circuit board is housed in a button accommodating member attached to the circuit board, thereby minimizing variations in the relative position dimensions of the switch and the button. This made it possible to downsize the device and simplify assembly.

However, in the structure in which the button is attached to the button accommodating member and the structure in which the button accommodating member is attached to the circuit board, the drive end of the button is located between the lever end of the switch that regulates the upper limit of button movement and the circuit board. , and a stopper provided on the button accommodating member that regulates the lower limit of movement of the button. For this purpose, the button accommodating member is fitted into the attachment hole provided at a predetermined position on the circuit board from the side opposite to the side on which the hook switch is mounted, and then the button is inserted into the button accommodating member from the side on which the hook switch is mounted. As a result, the button accommodating member had to be attached while being rotated, which meant that the assembly work could not be done from one direction, and the work involved rotation was extremely troublesome, and the shape of the button accommodating member was complicated. Furthermore, the sliding body of the button, which allows the button to reciprocate within the button accommodating member, is located on the outer peripheral surface and is easily affected by dust, which poses a risk of interfering with button operation, and furthermore, the structure is difficult to miniaturize. There are some drawbacks.

In order to solve these drawbacks, the present invention provides a rectangular shape of the sliding body of the button so that the relative position between the button and the button housing member is predetermined, and a through-hole through which the button passes through the circuit board. A mounting structure for a switch drive button is provided, in which when a button housing member incorporating the button is pushed in, it is engaged with a circuit board, and at the same time, the relative positional dimension between the drive end of the button and the lever end of the switch is uniquely determined. This is what we provide.

The present invention will be explained in detail below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, in which 1 is a circuit board on which a circuit component 2 and a switch 3 and other circuit components are mounted in advance, and 4 is a button accommodating member that accommodates a button 5 for driving the switch 3. .
The drive end 5 of the button 5 that drives the switch 3
-1 is the switch 3 mounting surface 1 of the circuit board 1.
a and the lever end 3-1 of the hook switch 3, the button 5 is lifted by the spring force of the hook switch 3, and when the operating portion 5-2 of the button 5 is pushed in the direction of arrow A, the button 5 is lifted up by the spring force of the hook switch 3. Lever end 3
-1 is configured to rotate to open and close a group of built-in contacts of the switch 3.

2 is an exploded perspective view of FIG. 1, and FIG. 3 is a diagram showing the sliding hole of the button. A locking hole 1-1, which can be penetrated by the operating portion 5-2 of the button 5 and which locks the button accommodating member 4, is provided at a predetermined position where the button 5 can be engaged. The button accommodating member 4 has a fitting convex portion 4-1 shaped like □l' so as to fit into the fixing hole 1-1 labeled □l of the circuit board 1, and four corners of the fitting convex portion 4-1. A contact portion 4-2 that comes into contact with the mounting surface 1a of the switch 3 is provided, and an engaging claw 4- that engages the circuit board 1 at a position corresponding to the board thickness t of the circuit board 1 from the contact portion 4-2.
3 are provided to face each other, and an open groove portion 4-4 is formed on the side perpendicular to the engaging claw 4-3. The fitting convex portion 4-1, the abutting portion 4-2, and the engaging claw 4-3 are
This serves as an engaging portion that engages the housing member 4 in the through hole 1-1 of the substrate 1 through which the push button 5 passes. Open groove part 4-4
This is to guide the driving end 5-1 of the button 5 and to provide necessary elasticity when the engaging claw 4-3 passes through the engaging hole 1-1 when engaged. The square pillar 4-5 protruding from the center is a support portion that fits into the sliding hole 5-3 of the button 5 shown in FIG.
It was formed into a rectangular shape to determine its relative position. As shown in the figure, the sliding hole 5-3 of the push button 5 is provided along the axis of the push button 5 so as not to penetrate through the upper end of the axis but to open at the center of the lower end. 4
-6 is a stopper that determines the lower position of the drive end 5-1. The upper position is regulated by the circuit board 1, as shown in FIG. In addition, the dimension l indicating the size of the fastening hole 1-1 of the circuit board 1 is the size of the button 5.
Another condition for penetrating the operating portion 5-2 is that the diagonal length of the prism 4-5 of the button accommodating member 4 is a,
Let b be the thickness of the engaging pawl 4-3, c be the height of the pawl, and d be the thickness of the diagonal portion of the sliding hole 5-3 of the button 5, l.
It is determined from a+2b+c+2d, and each factor may be set to the minimum from the strength standpoint. Moreover, in this example, it is set to □l.

With such a configuration, when the button 5 is inserted into the button accommodating member 4, the button 3
When the button accommodating member 4 is pushed into the locking hole 1-1 by expanding the lever end 3-1 to the position where the drive end 5-1 is inserted, the attachment is completed by the engaging claw 4-3 and at the same time, the button accommodating member 4 is inserted into the locking hole 1-1. The relative positional dimensions between the button and the button are uniquely determined. Furthermore, no auxiliary members or tools are required for installation, so there is no wasted space.

As explained above, according to the present invention, the sliding part of the button is made square and is installed internally, and the button housing member can be attached to the circuit board while the button is assembled, so there is no need to align the button. Assembly work has been simplified and the size has been reduced. Furthermore, since the upper end of the button sliding part is not exposed to the surface of the operating part 5-2 of the button 5, it is less susceptible to dust, and has great effects such as improving the reliability of button operation.

[Brief explanation of the drawing]

Fig. 1 is a perspective view including a cross section of an embodiment of the button mounting structure of the switch drive button of the present invention, Fig. 2 is an exploded perspective view of Fig. 1, and Fig. 3 is a perspective view showing the button sliding hole. It is. 1... Circuit board, 1-1... Attachment hole, 1a...
Hook switch mounting surface, 2...Circuit components, 3...
Hook switch, 3-1... Lever end, 4... Button accommodating member, 4-1... Fitting convex portion, 4-2... Contact portion, 4-3... Engaging claw (engaging portion), 4-4...
Open groove part, 4-5...Prismatic column (square convex shaft), 4-6
... Stopper, 5 ... Button, 5-1 ... Drive end, 5-2 ... Operation section, 5-3 ... Sliding hole.

Claims (1)

[Scope of utility model registration request] In a mounting structure for a switch drive button in which a lever end of a switch mounted on a board is driven by a push button housed in a housing member, the push button has a shaft extending along the axis of the push button and passing through the upper end of the axis. The housing member has a square protrusion that fits into the square slide hole of the push button, and a drive end for driving the switch. Attachment of a switch drive button, characterized in that the installation shaft is provided with a locking part that locks into a locking hole through which the push button passes through the substrate, and an opening groove that guides and moves a drive end of the push button. structure.