JP2013145698A - Waterproof switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waterproof switch capable of securing high waterproofness, preventing separation of an operation knob, and improving assemblability.SOLUTION: A waterproof switch 1 includes: a switch case to be attached to a panel, and storing a fixed contact point; a knob base (a movable member) 7 held so as to be displaceable relative to the switch case, the knob base displacing a movable contact point; an operation knob 4 coupled to the knob base 7; and a seal member 9 for preventing intrusion of water from between the operation knob 4 and the knob base 7. The operation knob 4 is provided with a peripheral edge 4B for holding a part 9a to be held of the seal member 9 between itself and the knob base 7. The knob base 7 and the seal member 9 are provided with recessed and projected fitting parts (a recess 9c and a projection 7f) at positions offset by ε from an edge of the peripheral edge 4B of the operation knob 4 to a push-in direction of the operation knob 4, respectively.

Description

  The present invention relates to a waterproof switch formed by sealing a movable portion with a waterproof seal member.

  Conventionally, a switch or the like for switching contacts by operating in a linear direction has adopted a configuration in which a movable part is covered with a seal member such as a rubber boot for dust prevention and waterproofing. An example is shown in FIG. Patent Document 1).

  That is, FIG. 7 is a side cross-sectional view of the main part of the waterproof switch, and the seal member 109 formed into a hollow bellows shape by an elastic member such as rubber has an annular groove portion with one end formed at the tip of the switch case 102. The other end of the shaft 103 is fitted into an annular groove 103a formed at the tip of the shaft 103, and the portion of the shaft 103 protruding from the switch case 102 is covered with a seal member 109. ing.

  In the waterproof switch, since both end portions of the seal member 109 are fitted into the groove portions 102a and 103a of the switch case 102 and the shaft 103 only by the force to shrink in the radial direction due to its elasticity, the seal member 109 When the material is hardened due to deterioration and loses elasticity, there is a possibility that the fitting force at both ends thereof may be reduced, or that the seal member 109 may crack and the sealing performance may be significantly reduced.

  In order to solve the above problem, in Patent Document 2, as shown in the cross-sectional view of FIG. 8, the through hole 209 a formed in the rubber cap (seal member) 209 is formed at the tip of the operating rod (shaft) 203. An operation button (operation knob) 204 separate from the drive rod 203 is fixed to the connection shaft 203a from the outer surface side of the rubber cap 209, and the lower surface of the operation button 204 is attached to the rubber cap 209. A configuration has been proposed in which the periphery of the through-hole 209a is pressed.

Japanese Patent No. 4328574 JP-A-5-002947

  However, in the configuration proposed in Patent Document 2, when an external force is applied to the operation button 204 in a direction to remove it from the drive rod 203, the operation button 203 is easily detached from the drive rod 203. There is.

  Further, when the rubber cap 209 is assembled, it is necessary to place the rubber cap 209 in a fixed position while pressing the peripheral edge of the through hole 209a of the rubber cap 209 against either the operation button 204 or the driving rod 203. The rubber cap 209 may be fixed at a position shifted from the original fixing position due to sliding friction between the cap 209 and the operation button 204 and the driving rod 203, and there is a problem that the assembling property of the rubber cap 209 is poor. there were.

  The present invention has been made in view of the above problems, and the object of the present invention is to provide a waterproof switch capable of preventing the detachment of the operation knob and improving the assembling property while ensuring high waterproofness. There is to do.

  In order to achieve the above object, the invention according to claim 1 is a switch case that is attached to a panel and accommodates a fixed contact; a movable member that is held displaceably with respect to the switch case and displaces the movable contact; In a waterproof switch comprising an operation knob connected to the movable member and a seal member that prevents water from entering between the operation knob and the movable member, the seal between the movable knob and the movable member is provided. Forms a peripheral edge that clamps one end of the member, and forms an uneven fitting portion on the movable member and the seal member at a position offset from the edge of the peripheral edge of the operation knob in the pushing direction of the operation knob. It is characterized by that.

  According to a second aspect of the present invention, in the first aspect of the invention, the outer peripheral surface of the portion of the seal member facing the fitting portion and the outer peripheral surface of the operation knob are substantially flush with each other. It is characterized by.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the fitting portion includes a convex portion projecting radially outward from a flange portion formed on a peripheral edge of the movable member, It is comprised by the recessed part formed in the internal peripheral surface of a sealing member, It is characterized by the above-mentioned.

  According to a fourth aspect of the invention, in the third aspect of the invention, the movable member is configured by engaging a slider having the movable contact and a knob base on which the flange portion is formed. An engagement portion that engages with the operation knob is formed on the inner peripheral surface.

  The invention according to claim 5 is the invention according to claim 4, wherein the knob base is made of a light-transmitting material, and the knob base is provided with a light transmitting portion that forms a closed space with the operation knob. It is characterized by that.

  The invention according to claim 6 is the invention according to claim 4 or 5, wherein the seal member is formed into a hollow bellows shape, and a peripheral edge of the operation knob and a peripheral edge of the flange portion of the knob base are formed at one end of the seal member. And a fixing portion attached to one end of the switch case is formed at the other end.

  According to the first aspect of the present invention, one end of the seal member is sandwiched between the peripheral portion formed on the operation knob and the movable member, and the movable member and the seal member are fitted into the concave and convex portions to thereby fit both of them. Since the contact area increases, it is possible to reliably prevent water from entering between the operation knob and the movable member, and the waterproofness of the waterproof switch is enhanced.

  Further, since the fitting portion between the seal member and the movable member is formed at a position offset from the edge of the peripheral portion of the operation knob in the pushing direction of the operation knob, an external force in the direction of removing the operation knob from the movable member acts on the seal member. In this case, the external force is received by the movable member via the fitting portion, and the external force does not act on the operation knob, so that the operation knob is reliably prevented from being detached from the movable member.

  Further, when the waterproof switch is assembled, the operation knob can be assembled with the sealing member held by the movable member by the fitting portion, so that the sealing member is not fixed at a position deviated from the original position. Assembling property of the waterproof switch is improved.

  According to the invention described in claim 2, since the outer peripheral surface of the portion facing the fitting portion of the seal member and the outer peripheral surface of the operation knob are substantially flush with each other, the boundary between the seal member and the operation knob is provided. A step does not occur, and even if the operation knob is directly operated to be removed, the seal member cannot be operated because it becomes an obstacle, and the operation knob cannot be removed.

  According to the third aspect of the present invention, the convex portion projecting radially outward from the flange portion formed on the periphery of the movable member and the concave portion formed on the inner peripheral surface of the seal member are fitted. Therefore, even if the operation knob is pushed away from the movable member via the seal member, the pressing force is received by the movable member via the fitting portion formed by the convex portion and the concave portion and does not reach the operation knob. The knob is reliably prevented from coming off from the movable member.

  According to the fourth aspect of the invention, the movable member is configured by engaging the slider and the knob base, and the engaging portion that engages with the operating knob is formed on the inner peripheral surface of the knob base. The knob can be securely fixed to the knob base, and after the operation knob is fixed to the knob base, the operation knob cannot be easily removed because the engaging portion is inside the knob base.

  In addition, since the knob base may be attached to the slider after the knob base, the operation knob, and the seal member are sub-assembled, the assembling property of the waterproof switch is improved.

  According to the fifth aspect of the present invention, the knob base is made of a light transmissive material, and a closed space is formed between the light transmitting portion of the knob base and the operation knob. Even if water enters, this water is confined in the closed space and does not flow into other parts, and the waterproofness of the waterproof switch is enhanced.

  According to the invention described in claim 6, since one end of the bellows-like seal member is sandwiched by the movable operation knob and the knob base with respect to the switch case, and the other end of the seal member is attached to one end of the switch case, the seal member Is elastically deformed to allow displacement of the operation knob and the movable member, and to reliably prevent water from entering between them (movable part). Further, since the leakage of light from between the operation knob and the switch case through the knob base made of a translucent material is surely prevented by the seal member, the appearance of the waterproof switch is enhanced.

1 is an exploded perspective view of a waterproof switch according to the present invention. 1 is a side view of a waterproof switch according to the present invention. It is the sectional view on the AA line of FIG. It is a rear view of the waterproof switch concerning the present invention. It is the B section enlarged detail drawing of FIG. It is a perspective view of the operation knob of the waterproof switch which concerns on this invention, a sealing member, and a knob base. It is a sectional side view of the principal part of a waterproof switch proposed in patent documents 1. It is sectional drawing of the waterproof switch principal part proposed in patent document 2. FIG.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 is an exploded perspective view of a waterproof switch according to the present invention, FIG. 2 is a side view of the waterproof switch, FIG. 3 is a cross-sectional view taken along line AA of FIG. 2, FIG. 4 is a rear view of the waterproof switch, and FIG. FIG. 3 is an enlarged detailed view of part B of FIG. 3, and FIG. 6 is a perspective view of the operation knob, the seal member, and the knob base of the waterproof switch.

  The waterproof switch 1 according to the present invention accommodates a movable member 3 in a substantially rectangular cylindrical switch case 2 so that the movable member 3 can be displaced, and a distal end portion (left end portion in FIG. 2) protruding from the switch case 2 of the movable member 3. The operation knob 4 is attached to the terminal case 5 and the terminal base 5 is incorporated into the switch case 2 from the rear end (right end in FIG. 2).

  The switch case 2 is fixed to the panel by engaging engaging claws 2a formed integrally on the left and right sides thereof with the peripheral edge of a mounting hole (not shown). A circular flange portion 2A is integrally formed at the front end portion of the switch case 2, and a ring groove spring receiver 2b is formed on the flange portion 2A as shown in FIGS. Yes. As shown in FIG. 1, rectangular engagement holes 2c (only one is shown in FIG. 1) are formed above and below the rear end of the switch case 2. As shown in FIG.

  The movable member 3 accommodated in the switch case 2 so as to be displaceable in the left-right direction in FIG. 3 is composed of a rectangular block-shaped slider 6 and a two-stage cylindrical knob base 7 which is engaged with the tip portion thereof. The slider 6 is integrally formed of an opaque material, and the knob base 7 is integrally formed of a transparent light-transmitting material such as acrylic resin.

  A cylindrical fitting cylinder 6A (see FIG. 1) is integrally formed at the front end of the slider 6, and the left and right sides of the fitting cylinder 6A are engaged as shown in FIGS. A joint claw 6a (only one is shown in FIG. 1) is integrally formed, and guide protrusions 6b (only one is shown in FIG. 1) projecting from the top and bottom of the fitting cylinder 6A. The slider 6 is provided with a movable contact (not shown), and this movable contact selectively contacts a fixed contact 5c (see FIG. 1) provided on the terminal base 5 by the pressing operation of the operation knob 4. .

  The knob base 7 is configured by integrally forming an annular flange portion 7B at the front end of a small diameter fitting cylinder 7A. As shown in FIG. A rectangular engaging hole 7a is formed in a portion corresponding to the engaging claw 6a), and guide grooves 7b having different widths are formed above and below the fitting cylinder 7A. Further, as shown in FIG. 3, a light transmitting portion 7c as a circular partition is formed between the fitting cylinder 7A and the flange portion 7B of the knob base 7, and the circumferential direction of the inner peripheral surface of the flange portion 7B. As shown in FIG. 1, rectangular engaging claws 7d (only one is shown in FIG. 1) are formed at four locations, and guide protrusions 7e having different widths are formed above and below the inner peripheral surface of the flange portion 7B. (Only one of them is shown in FIG. 1) is projected.

  Further, as shown in detail in FIG. 5, a flange-like convex portion 7 f is integrally projected on the outer periphery of the flange portion 7 </ b> B of the knob base 7 outward in the radial direction.

  Thus, the knob base 7 is fitted into the outer periphery of the fitting cylinder 6A of the slider 6 as shown in FIG. 3, and at this time, the knob base 7 has a width formed above and below the fitting cylinder 7A. Positioning of the knob base 7 and the slider 6 in the circumferential direction is achieved by engaging guide protrusions 6b (see FIG. 1) protruding from the top and bottom of the fitting cylinder 6A of the slider 6 in different guide grooves 7b (see FIG. 6). In addition, misconfiguration between the two is prevented. Then, when the knob base 7 is pushed in with the fitting cylinder 7A of the knob base 7 fitted into the fitting cylinder 6A of the slider 6, the engagement holes formed in the fitting cylinder 7A of the knob base 7 as shown in FIG. The engaging claw 6a protruding from the fitting cylinder 6A of the slider 6 is engaged with 7a, and the knob base 7 is attached to the tip end portion of the slider 6, and both are engaged and integrated.

  The operation knob 4 is integrally formed in a circular shape with a transparent translucent material such as acrylic resin, and a fitting cylinder 4A is integrally formed on the back side thereof as shown in FIG. Then, engagement holes 4a (see FIG. 6) are provided at four places in the circumferential direction of the fitting cylinder 4A (four places corresponding to the engagement claws 7d (see FIG. 1) formed on the flange portion 7B of the knob base 7). (Only one is shown) is formed, and guide grooves 4b having different widths are formed above and below the fitting cylinder 4A.

  Thus, the operation knob 4 has its fitting cylinder 4A fitted into the inner periphery of the flange portion 7B of the knob base 7 as shown in FIG. 3. At this time, the width formed above and below the fitting cylinder 4A. The guide knobs 7e (only one of which is shown in FIG. 3) projecting up and down on the inner peripheral surface of the flange portion 7B of the knob base 7 are fitted into the different guide grooves 4b, whereby the operation knob 4 and the knob base 7 are fitted. Is positioned in the circumferential direction, and misconfiguration of both is prevented. When the operation knob 4 is pushed in with the fitting cylinder 4 </ b> A of the operation knob 4 fitted in the inner periphery of the flange portion 7 </ b> B of the knob base 7, the engagement claw 7 d of the flange portion 7 </ b> B of the knob base 7 is The operating knob 4 is attached to the flange portion 7B of the knob base 7 so as to be engaged with the engaging hole 4a projecting from the fitting cylinder 4A, and the operating knob 4 and the knob base 7 are integrated. After the operation knob 4 is fixed to the knob base 7 in this manner, the operation knob 4 cannot be easily removed because the engaging claw 7d on the knob base 7 side is inside the knob base 7.

  As described above, the slider 6 and the knob base 7 constituting the movable member 3 are engaged and integrated with each other, and the operation knob 4 is fixed to the knob base 7 by engagement. 3 is held so as to be displaceable in the left-right direction in FIG. 3 with respect to the switch case 2, and these are contracted between the rear surface of the knob base 7 and the spring receiving portion 2b formed on the flange portion 2A of the switch case 2. The mounted return spring 8 is urged to the left in FIG. 3 (the movable contact (not shown) on the slider 6 side is away from the fixed contact 5c of the terminal base 5 and the waterproof switch 1 is turned off).

  By the way, as shown in FIG. 3, the knob base 7 and the return spring 8 which are movable parts protruding forward from the switch case 2 of the waterproof switch 1 are covered and sealed by a waterproof seal member 9. Here, the seal member 9 is formed into a hollow bellows shape by an elastic material such as rubber, and a sandwiched portion 9a is formed at one end and a fixing portion 9b is formed at the other end.

  Further, as shown in detail in FIG. 5, a concave portion 9c is formed on the inner peripheral surface of the seal member 9 over the entire circumference, and a convex portion formed on the flange portion 7B of the knob base 7 in the concave portion 9c. 7f is fitted. Here, the convex portion 7 f of the knob base 7 and the concave portion 9 c of the seal member 9 that are fitted together constitute a fitting portion, and this fitting portion is connected to the operation knob 4 from the end of the peripheral edge portion 4 B of the operation knob 4. 4 is formed at a position offset by ε as shown in the pushing direction (right side in FIG. 5). In this embodiment, the offset amount ε of the fitting portion is from the end of the peripheral edge portion 4B of the operation knob 4. The center of the convex portion 7f of the knob base 7 is offset, and the seal member 9 is disposed between the end of the peripheral portion 4B of the operation knob 4 and the surface 7g of the convex portion 7f of the knob base 7 facing the operation knob 4. It is pinched. That is, the offset amount ε of the fitting portion is set such that the thickness of the seal member 9 is separated between the end of the peripheral edge portion 4B of the operation knob 4 and the surface 7g of the convex portion 7f of the knob base 7.

  Further, the peripheral portion 4B of the operation knob 4 is bent in an arc shape toward the back side, and the sandwiched portion 9a at one end of the seal member 9 is sandwiched between the peripheral portion 4B and the flange portion 7B of the knob base 7. The fixing portion 9b formed on the other end of the seal member 9 is fitted into the outer peripheral surface of the flange portion 2A of the switch case 2 and fixed. In actual assembly, first, the flange portion 7B of the knob base 7 is fitted into the sandwiched portion 9a of the seal member 9, and the operation knob 4 is fixed to the knob base 7 as described above, whereby the seal member 9 is fixed. The sandwiched portion 9a is sandwiched and sandwiched between the peripheral edge portion 4B of the operation knob 4 and the flange portion 7B of the knob base 7. In the state where the seal member 9 is assembled as shown in FIG. 3, the outer peripheral surface of the sandwiched portion 9a of the seal member 9 and the outer peripheral surface of the peripheral portion 4B of the operation knob 4 are substantially flush with each other. Since there is no level difference between the two, the operation knob 4 cannot be hooked and removed. In the present embodiment, the outer peripheral surface of the sandwiched portion 9a of the seal member 9 and the outer peripheral surface of the peripheral portion 4B of the operation knob 4 are substantially flush with each other, but the operation knob 4 is hooked. In order to prevent this from being removed, the outer diameter of the sandwiched portion 9a of the seal member 9 is set larger than the outer diameter of the peripheral portion 4B of the operation knob 4, and the outer peripheral surface of the operation knob 4 is sealed. What is necessary is just not to protrude from the outer peripheral surface of the to-be-clamped part 9a of the member 9 to radial direction outward.

  Thus, in the present embodiment, as shown in FIGS. 5 and 6, the clamping surface (the surface facing the sandwiched portion 9 a of the seal member 9) that is the inner surface of the peripheral edge portion 4 </ b> B of the operation knob 4 is provided. A plurality of concavities and convexities 10 are formed concentrically. Further, as shown in FIG. 6, a light bending portion 11 composed of a plurality of concentric lens cuts for bending light is formed in a circular portion surrounded by the fitting cylinder 4A on the inner surface (back surface) of the operation knob 4. Is formed. In the state where the operation knob 4 is fixed to the knob base 7, the light transmitting portion 7 c of the knob base 7 forms a closed space S with the operation knob 4 as shown in FIG. 3.

  The terminal base 5 fitted into the switch case 2 from the rear end opening is integrally formed with a rectangular cylindrical coupler portion 5A at the rear end, and a front half portion 5B ahead of the coupler portion 5A is formed. The switch case 2 is fixed by being fitted in from the rear end opening. That is, as shown in FIG. 1, engaging claws 5a (only one is shown in FIG. 1) are formed above and below the front half 5B of the terminal base 5, and the terminal base 5 switches the front half 5B. The switch case 2 is fitted into the case 2 from the rear end opening, and the engaging claws 5a projecting vertically are engaged with the engagement holes 2c formed above and below the rear end of the switch case 2. Fixed.

  A substrate 12 is vertically mounted on the front end surface of the terminal base 5, and an LED (light emitting diode) 13 as a light emitting unit is mounted on the substrate 12, and the upper and lower portions projecting forward from the terminal base 5. Two terminals 14 are inserted and electrically connected to the substrate 12. Further, as shown in FIG. 1, a shaft 5b protrudes laterally from the side of the terminal base 5, and a cam spring 15 is wound around the shaft 5b. One end of the cam spring 15 is locked to the terminal base 5, and the other end is engaged with a cam 6c formed on the slider 6 as shown in FIG. As shown in FIG. 4, the upper and lower two terminals 16 and the upper and lower four terminals 17 are accommodated in the coupler portion 5 </ b> A of the terminal base 5. The cam spring 15 and the cam 6c of the slider 6 with which one end thereof engages constitute a push lock mechanism.

  In the waterproof switch 1 configured as described above, when the operator pushes the operation knob 4 against the urging force of the return spring 8, the movable member 3 connected to the operation knob 4 moves in the same direction (in FIG. 3). Since the movable contact (not shown) provided on the slider 6 of the movable member 3 contacts the fixed contact 5c provided on the terminal base 5, the waterproof switch 1 is turned on. Even when the operator releases his hand from the operation knob 4, the displacement of the movable member 3 is locked, and the ON state of the waterproof switch 1 is maintained by the push lock mechanism. Further, when the waterproof switch 1 is in the ON state, when the LED 13 mounted on the substrate 12 is energized and activated, the light emitted from the LED 13 is transmitted through the light transmitting portion 7c of the transparent knob base 7. Then, the operation knob 4 is advanced, bent by the light bending portion 11 formed on the inner surface of the operation knob 4, and emitted to the outside.

  Thereafter, when the operator presses the operation knob 4 again, the movable member 3 is unlocked by the push lock mechanism, and the movable member 3 and the operation knob 4 are displaced to the left in FIG. 3 by the urging force of the return spring 8. Therefore, since the movable contact provided on the slider 6 of the movable member 3 is separated from the fixed contact 5c of the terminal base 5, the waterproof switch 1 is turned off, and the power supply to the LED 13 is cut off. To do.

  As described above, according to the waterproof switch 1 of the present invention, the sandwiched portion 9a of the seal member 9 is sandwiched between the peripheral edge portion 4B formed on the operation knob 4 and the knob base 7, and the knob base 7 Since the contact area between the knob base 7 and the sealing member 9 is increased by fitting the convex portion 7f of the sealing member 9 with the concave portion 9c of the sealing member 9, it is possible to reliably prevent water from entering between the operation knob 4 and the movable member 3. The waterproofness of the waterproof switch 1 can be improved.

  Further, since the concave portion 9c and the convex portion 7f, which are fitting portions between the seal member 9 and the knob base 7, are formed at positions offset from the end of the peripheral edge portion 4B of the operation knob 4 by ε in the pushing direction of the operation knob 4. 5, when an external force F in the direction of removing the operation knob 4 from the movable member 3 is applied to the seal member 9, the external force F is received by the movable member 3 via the concave portion 9 c and the convex portion 7 f which are fitting portions. Thus, the external force F does not act on the operation knob 4, and the operation knob 4 is reliably prevented from being detached from the movable member 3.

  Furthermore, when the waterproof switch 1 is assembled, the operation knob 4 can be assembled in a state where the seal member 9 is held by the movable member 3 by the concave portion 9c of the seal member 9 which is a fitting portion and the convex portion 7f of the knob base 7. Therefore, the seal member 9 is not fixed at a position shifted from the original position, and the assembling property of the waterproof switch 1 is improved.

  Further, in the present embodiment, the movable member 3 is configured by engaging the slider 6 and the knob base 7, and the engagement with the engagement hole 4 a of the operation knob 4 on the inner peripheral surface of the knob base 7. Since the joint claw 7d is formed, the operation knob 4 can be securely fixed to the knob base 7, and after the operation knob 4 is fixed to the knob base 7, the engagement claw 7d is inside the knob base 7, so that the operation knob 4 4 cannot be removed easily. Since the knob base 7 may be attached to the slider 6 after sub-assembling the knob base 7, the operation knob 4 and the seal member 9, the assemblability of the waterproof switch 1 is improved.

  In addition, in the present embodiment, the knob base 7 is made of a light-transmitting material, and the closed space S is formed between the light transmitting portion 7c of the knob base 7 and the operation knob 4. Even if water enters from the sandwiched portion 9a, the water is confined in the closed space S and does not flow into other portions, and the waterproofness of the waterproof switch 1 is improved.

  In the present embodiment, the projection 7f of the knob base 7 of the fitting portion and the recess 9c of the seal member 9 are fitted with no gap, but the present invention is not limited to this. As long as the operation knob 4 can be assembled with the knob base 7 being held in place. In addition, the offset amount ε of the fitting portion is an amount in which the thickness of the seal member 9 is separated between the end of the peripheral edge portion 4B of the operation knob 4 and the surface 7g of the convex portion 7f of the knob base 7. When an external force in the direction of removing the knob base 7 acts on the seal member 9, the fitting portion may be provided at a position where the external force can be received before the operation knob 4 by the convex portion 7 f of the knob base 7. The thickness 9 may be a thickness considering the strength of the seal member 9.

  Further, in the present embodiment, a sandwiched portion 9 a formed at one end of the bellows-like seal member 9 is sandwiched by the movable operation knob 4 and the knob base 7 with respect to the switch case 2, Since the fixed portion 9b formed at the end is attached to one end of the switch case 2, the seal member 9 is elastically deformed to allow the operation knob 4 and the movable member 3 to be displaced, and water from between the two (movable portion) is allowed. It functions to prevent intrusion without fail. And since the leakage of the light from between the operation knob 4 and the switch case 2 through the knob base 7 which consists of a translucent material is prevented reliably by the sealing member 9, the external appearance property of the said waterproof switch 1 is improved. .

  In the above, the embodiment in which the present invention is applied to the waterproof switch adopting the push lock method has been described. However, the present invention is also applicable to other waterproof switches not adopting the push lock method. Of course.

DESCRIPTION OF SYMBOLS 1 Waterproof switch 2 Switch case 2A Flange part of switch case 2a Engagement nail of switch case 2b Spring holder of switch case 2c Engagement hole of switch case 3 Movable member 4 Operation knob 4A Fitting cylinder of operation knob 4B Perimeter of operation knob 4a Operation knob engagement hole 4b Operation knob guide groove 5 Terminal base 5A Terminal base coupler 5B Front half of terminal base 5a Terminal base engagement claw 5b Terminal base shaft 5c Terminal fixed contact 6 Slider 6A Slider 6a Slider engaging claw 6b Slider guide protrusion 6c Slider cam 7 Knob base 7A Knob base fitting cylinder 7B Knob base flange 7a Knob base engaging hole 7b Knob base guide groove 7c Knob base light transmitting portion 7d Knob base engagement claw (engagement part)
7e Knob base guide protrusion 7f Knob base convex portion 7g Knob base convex portion surface 8 Return spring 9 Seal member 9a Seal member sandwiched portion 9b Seal member fixing portion 9c Seal member concave portion 10 Operation knob uneven portion 11 Operation knob Light bending part 12 Substrate 13 LED
14 Terminal 15 Cam spring 16, 17 Terminal S Closed space ε Offset of fitting part

Claims (6)

A switch case that is attached to the panel and accommodates a fixed contact; a movable member that is displaceably held with respect to the switch case and displaces the movable contact; an operation knob coupled to the movable member; and the operation knob; In a waterproof switch comprising a seal member that prevents water from entering between the movable member,
The operation knob is formed with a peripheral edge portion that sandwiches one end of the seal member between the movable member and an uneven fitting portion between the movable member and the seal member. A waterproof switch characterized by being formed at a position offset from the end in the pushing direction of the operation knob.   The waterproof switch according to claim 1, wherein an outer peripheral surface of a portion of the seal member facing the fitting portion and an outer peripheral surface of the operation knob are substantially flush with each other.   The fitting portion includes a convex portion projecting radially outward from a flange portion formed on a peripheral edge of the movable member, and a concave portion formed on an inner peripheral surface of the seal member. The waterproof switch according to claim 1 or 2, characterized in that:   The movable member is configured by engaging a slider having the movable contact and a knob base on which the flange portion is formed, and an engaging portion that engages with the operation knob is provided on an inner peripheral surface of the knob base. The waterproof switch according to claim 3, wherein the waterproof switch is formed.   5. The waterproof switch according to claim 4, wherein the knob base is made of a translucent material, and the knob base is provided with a light transmissive portion that forms a closed space with the operation knob. The seal member is formed into a hollow bellows shape, and a clamped portion that is clamped between a peripheral portion of the operation knob and a peripheral portion of the flange portion of the knob base is formed at one end of the seal member, and the other end 6. The waterproof switch according to claim 4, further comprising a fixing portion attached to one end of the switch case.

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