JPH0650199U - Dial switch with push-lock mechanism - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] Improved knob mounting structure of dial switch with push lock mechanism. [Structure] A groove extending in the circumferential direction is provided at the tip of a shaft having a substantially semi-shaped cross section protruding from the switch unit portion 3, that is, a knob mounting portion, and a spring ring having a substantially semi-circular cylindrical shape is elastic to engage with the groove. (EN) Provided is a knob fixing structure capable of increasing a coupling force between a shaft of a switch and a knob by providing an engaging piece to be engaged in a notch formed in an inner surface of an engaging claw and a shaft fitting hole of a knob. It is a thing.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a knob fixing structure for a dial switch with a push lock mechanism.

[0002]

[Prior art]

 As a conventional knob fixing structure in a dial switch with a push-lock mechanism, there are, for example, those shown in FIGS. That is, reference numeral 1 denotes a shaft which projects from the unit portion 2 of the dial switch with a push-lock mechanism and transmits the rotational movement and the pressing operation into the unit portion 2. The knob mounting member formed at the tip portion of the shaft 1 The sectional shape of the part is a substantially semicircular shape for preventing the knob 3 from turning.

Further, as shown in FIG. 2, a spring ring 5 of a substantially semi-circular cylinder having an elastic bending piece 4 having a central portion folded inward is fitted to the tip portion of the shaft 1, and the spring is The knob 3 is elastically held via the ring 5. The knob 3 and the semi-circular cylindrical spring ring 5 are held by the substantially semi-circular cylindrical spring ring 5 having an outer diameter slightly larger than the inner diameter of the substantially semi-circular hole portion 6 provided in the knob. By press-fitting into the portion 6, the elastic folding piece 4 provided on the substantially semi-circular cylindrical spring ring 5 is fitted and held by the repulsive force, and the substantially semi-circular cylindrical spring ring 5 and the shaft 1 are connected to each other. Is engaged and held by the holding force by the elasticity of the bent piece 4 of the substantially semicircular tubular spring ring 5.

[0004]

[Problems to be solved by the device]

 However, in such a conventional knob fixing structure for a dial switch with a push-lock mechanism, the knob 3, the spring ring 5 having a substantially semicircular tubular shape, and the shaft 1 are arranged in the spring ring 5 having a substantially semicircular tubular shape. Since the elastic restoring force of the bending piece 4 provided holds the connection, the connecting force in the thrust direction between the shaft 1 and the knob 3 becomes insufficient. For example, a dial switch with a push-lock mechanism is indicated by the chain line in FIG. There was a problem that the knob 3 would slip out of the shaft 1 and fall off due to the impact force generated when the lock state shown in the figure is changed to the unlock state shown by the solid line.

[0005]

[Means for Solving the Problems]

 The present invention has been made in view of such a conventional problem, and is an improvement of the knob mounting structure of the dial switch with a push-lock mechanism, which has a substantially semicircular cross section protruding from the switch unit 3. A groove extending in the circumferential direction is provided at the tip of the shaft, that is, the knob mounting portion, and an elastic locking claw that engages with the groove is formed on the spring ring of a substantially semi-circular cylindrical shape and the inner surface of the shaft fitting hole of the knob. The present invention provides a knob fixing structure capable of increasing the coupling force between the switch shaft and the knob by providing a locking piece to be locked in the cutout portion.

[0006]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 3 and 4.

First, the configuration will be described. In FIG. 3, reference numeral 11 denotes a shaft which projects from the switch unit 12 portion and transmits the rotational pressing operation to the switch mechanism in the unit 12. The shaft 11 has a tip end portion. The knob mounting portion 13 has a substantially semicircular cross section to prevent the knob from rotating, and a groove 14 extending in the circumferential direction is provided in a part of the substantially semicircular portion. Reference numeral 15 is a substantially semi-cylindrical type, which is a spring ring fitted to the knob mounting portion at the tip of the shaft. The spring ring is provided along the tip direction of the shaft 11 in the center direction of the shaft 11. An elastic locking pawl 6 that is inclined and engages with the groove 14 formed in the shaft 11 to prevent the shaft from coming off, and a pawl portion 17 that projects radially outward from the end edge of the spring ring 15. It is integrally formed.

Reference numeral 18 denotes a knob to be mounted on the knob mounting portion 13. The knob mounting portion 13 is fitted to the central portion of the back side of the knob 18 via the spring ring 15 in a substantially planar shape. A circular recess 19 is formed. On the inner peripheral surface 20 of the recess 19, a notch 21 with which the claw 17 is engaged is formed.

The configuration of this embodiment has been described above. Next, its operation will be described.

First, in the recess 19 formed in the knob 18, the claw portion 17 having an outer diameter slightly larger than the inner diameter of the substantially semicircular recess 19 formed in the knob and protruding outward in the radial direction. The semi-circular cylindrical spring 2 having a substantially semi-circular cylindrical shape is press-fitted into the knob hole 11 to press and hold the spring ring 15 in a substantially semi-circular cylindrical shape. At the same time, the claw portion 17 of the spring ring 15 is locked in the notch portion 21 formed in the concave portion 19, so that the knob and the spring ring 15 having a substantially semicircular tubular shape are securely engaged and held. Next, the tip of the shaft 11 protruding from the switch unit 12 is inserted into the spring ring 15 that is engaged and held in the recess 19 of the knob to lock the hook 16 provided on the spring ring 15. However, when the elastic burr portion 6 is inserted into and engaged with the groove 14 of the knob mounting portion 13, the shaft 11 is irremovably fixedly coupled to the spring ring 15 integrated with the knob. is there.

Therefore, since the shaft 11 is securely locked to the knob 18 via the spring ring 15 without being displaced in the axial direction and the circumferential direction, the shaft 11 of the dial switch with the push-lock mechanism is changed from the locked state to the unlocked state. The knob 18 and the substantially semi-circular cylindrical spring ring 15 do not fall off due to the impact force generated when it is set.

[0012]

[Effect of device]

 As described above, the present invention is a dial switch with a push-lock mechanism that repeatedly opens and closes an electric path by repeatedly pressing and pushing the operating knob 18 and returning the protruding knob by rotating and pressing the operating knob 18. The knob mounting portion 13 at the tip of the shaft 11 protruding from 12 is formed to have a substantially semicircular cross section, and further provided with a groove 14 extending in the circumferential direction in the substantially semicircular portion, and to be fitted in the substantially semicircular portion. The spring ring 15 having a substantially semi-circular cylindrical shape is provided with an elastic locking claw 16 that engages with the groove 14 to prevent the spring ring 15 from projecting, and projects outward from the end edge of the spring ring 15 in the radial direction to the knob 18. Since the dial switch with the push-lock mechanism is provided with the claw portion 17 to be engaged with the notch portion 21 formed on the inner wall surface of the formed recessed portion 19, the switch according to this is provided. The shaft 11 and the knob 18 are securely engaged with each other via the spring ring 15 without being displaced in the axial direction and the circumferential direction. Therefore, for example, the switch is locked and unlocked by operating the knob 18. In this case, even if an impact reaction force acts on the knob 18, the knob 18 does not come off from the shaft 11, and the effect of securing the coupling holding force between the shaft 11 and the knob 18 is obtained. To be

[Brief description of drawings]

FIG. 1 is a structural explanatory view showing a conventional knob mounting structure.

FIG. 2 is a perspective view showing a conventional spring ring.

FIG. 3 is a structural explanatory view showing a knob mounting structure of the embodiment of the present invention.

FIG. 4 is a perspective view showing a spring ring according to an embodiment of the present invention.

[Explanation of symbols]

11 ... Shaft 12 ... Switch unit 13 ... Knob mounting part 14 ... Groove 15 ... Spring ring 16 ... Locking claw 17 ... Claw 18 ... Knob 19 ... Recess 20 ... Inner peripheral surface 21 ... Notch

Claims (1)

[Scope of utility model registration request] 1. A dial switch with a push-lock mechanism for opening and closing an electric path by repeatedly rotating a push-pushing position of a control knob (18) and a return position of a protrusion knob by rotating and pressing the control knob (18). The cross section of the knob mounting portion (13) at the tip of the shaft (11) protruding from the portion (12) is formed into a substantially semicircular shape,
Further, a groove (14) extending in the circumferential direction is provided in the substantially semi-circular portion, and the groove (14) is provided in a substantially semi-circular cylindrical spring ring (15) fitted in the substantially semi-circular portion. The elastic locking claw (16) that engages with the spring to prevent it from coming off and the knob (1) that projects radially outward from the end edge of the spring ring (15).
A dial switch with a push-lock mechanism, characterized in that a claw portion (17) engaged with a notch portion (21) formed on the inner wall surface of the recessed portion (19) formed in 8) is provided.