JPH0453085Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a foot lever shaft holding structure for a telephone foot switch, which allows the positioning of the foot lever shaft to be performed with a simple structure and with high precision.

"Prior Art" Fig. 4 is an exploded perspective view of a telephone switch according to the prior art, and Figs. 5 and 6 are partial cross-sections and side views of the main parts of the same, where 1 is the base and 2 is the movable switch. A movable contact spring set in which contact springs 2a to 2d are integrally molded, 3 is a fixed contact spring set in which fixed contact springs 3a to 3d equipped with fixed contacts are integrally molded, 4 is a foot lever, 5 is a cover, and 6 is a This is a recovery coil spring. To explain the assembly, the fixed contact spring sets 3 are respectively inserted into the recesses 1b provided in the base 1 and are fitted and held. The foot lever shaft 4a provided on the foot lever 4 is inserted so as to be positioned in the U-shaped bearing portion 1c provided on the base 1. When the cover 5 is press-fitted into the base 1 while aligning the arm portion 5a provided on the cover 5 with the groove 1d provided on the base 1, the convex portion 1e provided on the base 1
fits into the hole 5b provided in the arm 5a of the cover 5. The assembly is completed by hooking both sides of the recovery coil spring 6 into the grooves provided at the tips of the support parts 1f and 4b provided on the base 1 and the foot lever 4, respectively. To explain the operation, the foot lever 4
When a pressing force is applied to the pressing portion 4c, the foot lever 4 moves around the foot lever shaft 4a against the restoration coil spring 6. Then, the cam portion 4d provided on the foot lever shaft 4a engages the movable contact spring 2b.
2d to release the contact with the fixed contact springs 2b to 2d. When the pressing force applied to the pressing portion 4c of the foot lever 4 is released, the original state is restored by the tension of the restoration coil spring 6.

"Problems that the invention attempts to solve" However, as mentioned above, with conventional technology,
The vertical positioning of the lever shaft 4a is determined by the fit between the U-shaped bearing portion 1c provided on the base 1 and the cover 5. (See Figures 5 and 6)
Therefore, there is a problem that the fitting dimensions and the warping of the cover 5 directly affect the vertical position accuracy of the foot lever shaft 4a, which may cause unstable operation, and the vertical position accuracy of the foot lever shaft 4a may be directly affected. Since this also affects the opening/closing operation characteristics of the movable contact spring set 2, there has been a demand for improvement.

``Means for solving the problem'' Therefore, in the present invention, a contact spring set consisting of a movable contact spring and a fixed contact spring is housed in a box-shaped base with a partially opened part, and the contact spring set is In a telephone foot switch, in which a foot lever shaft is located above and a cam portion provided on the foot lever shaft opens and closes the set spring set, each of two parallel sides of the opening of the base is extended to form a convex portion. and an L-shaped bearing part together with the convex part, and the foot lever shaft is positioned at the tip of the horizontal part of the bearing part, and a biasing force is applied to the foot lever shaft toward the tip side. This is how it was done.

``Embodiment'' Fig. 1 is an exploded perspective view of a telephone switch according to the present invention, and Figs. 2 and 3 are partial cross-sections and side views of the main parts. was added to avoid duplication of explanation. Reference numeral 1c' indicates an L-shaped bearing portion formed with a protrusion 1g provided on the base 1, 5c a protrusion provided on the cover 5, and 5d a notch provided on the cover 5. To explain the assembly, after inserting the movable contact spring set 2 into the recess 1a provided in the base 1 and the fixed contact spring set 3 into the recess 1b provided in the base 1, the foot lever shaft 4a is inserted into the bearing part 1c' of the base 1. Insert it from the vertical part and move it so that it is located at the tip of the horizontal part. When the cover 5 is press-fitted into the base 1 while aligning the arm portion 5a of the cover 5 with the groove 1d of the base 1, the base 1
The convex portion 1e of the cover 5 fits into the hole 5b of the arm portion 5a, and the convex portion 5c of the cover 5 fits into the bearing portion 1 of the base 1.
The notch 5d of the cover 5 is located at the vertical part of the base 1.
The convex portions 1g are respectively fitted. The assembly is completed by hooking both sides of the recovery coil spring 6 into the grooves of the support parts 1f and 4b of the base 1 and the foot lever 4.

Regarding operation, the foot lever 4 is the same as before.
The movable contact spring set 2 and the fixed contact spring set 3 are opened and closed depending on the presence or absence of a pressing force applied to the pressing portion 4c.

"Effects of the Invention" As explained above, according to the invention, the vertical positioning of the foot lever shaft 4a is performed at the tip of the horizontal part of the L-shaped bearing part 1c' formed with the convex part 1g of the base 1. The vertical position accuracy of the foot lever shaft 4a is not affected by the fit between the cover and the base, and is also affected by warpage of the cover, etc. (see Figures 2 and 3). Since there is no such problem, it is possible to obtain a telephone switch with more stable operation and opening/closing characteristics than in the past.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a telephone switch according to the present invention, FIGS. 2 and 3 are partial cross-sectional and side views of essential parts, and FIG. 4 is an exploded perspective view of a conventional telephone switch. , FIG. 5, and FIG. 6 are partial cross-sectional and side views of the main parts of the same. 1...Base, 2...Movable contact spring assembly, 3...
Fixed contact spring assembly, 4...foot lever, 5...cover, 6...coil spring for restoration.

Claims (1)

[Scope of utility model registration request] A contact spring set consisting of a movable contact spring and a fixed contact spring is housed in a box-shaped base with a partially opened part, and a foot lever shaft is located above the contact spring set, and a cam is provided on the foot lever shaft. In a telephone hook switch whose part opens and closes the contact spring assembly, a convex part is provided by extending each of the two parallel sides of the opening of the base, and an L-shaped bearing is provided together with the convex part. A foot lever shaft holding structure for a telephone foot switch, characterized in that the foot lever shaft is positioned at the tip of the horizontal portion of the bearing portion, and a biasing force is applied to the foot lever shaft toward the tip side. .