JP4379207B2 - Push button switch - Google Patents

Description

  The present invention relates to a dustproof and waterproof pushbutton switch suitable as an illuminated pushbutton switch or the like used by being attached to an operation panel such as a control box.

  In general, as shown in FIG. 5, the push button portion 30 in the illumination type push button switch includes a reflection plunger 31, a diffusion plate 32, an engraving plate 33, and a cap 34, and a holding portion for the reflection plunger 31. The diffusing plate 32 is mounted on the slab 35, the engraving plate 33 is detachably fitted to the diffusing plate 32, and the cap 35 is put on the holding portion 35 so as to cover the sculpting plate 33.

  When the illuminated pushbutton switch is delivered to the customer, it is necessary to write a name on the engraving plate 33. In this case, after removing the cap 34 from the holding portion 35 and writing the name on the engraving plate 33, the engraving plate 33 is placed on the diffusion plate 32 again, and the cap 34 is fitted into the holding portion 35 to cover the engraving plate 33. Like that. Thus, in order to attach and detach the cap 34 to and from the holding portion 35, a gap S must be formed between the cap 34 and the push button accommodating portion 37 of the case 36. Accordingly, dust or water enters from the gap S and affects the movement of the operation plunger 38 that holds the push button portion 30, and also affects the switch portion 39.

  For this reason, in the conventional illuminated pushbutton switch, the seal member 40 is mounted on the outer peripheral portion of the operation plunger 38, and the lip portion 41 of the seal member 40 is slid on the inner peripheral surface portion of the case 36. Intrusion of dust and water from S into the switch 39 side is prevented.

  That is, a seal member fitting portion 42 formed of a concave groove portion is formed on the outer peripheral portion of the operation plunger 38, and a conical surface portion 44 is formed at the end of the cylindrical fitting portion 43 of the reflective plunger 31. When the base 40A of the seal member 40 is fitted to the seal member fitting portion 42 and the reflecting plunger 31 is fitted to the operation plunger 38, the base portion 40A of the seal member 40 is formed by the conical surface portion 44 of the fitting portion 43. The seal member 40 is mounted on the outer peripheral portion of the operation plunger 38 so as to hold down.

  Then, the push button portion 30 is pushed in, and the contact opening / closing operation of the switch portion 39 is performed via the operation plunger 38. In this case, the operation plunger 38 slides the lip portion 41 of the seal member 40 on the inner peripheral surface portion of the case 36. By moving, dust or water entering from the gap S is prevented from entering the switch unit 39 side.

  However, since the lip portion 41 of the seal member 40 is configured to slide on the inner peripheral surface portion of the case 36, the lip portion 41 of the seal member 40 and the inner portion of the case 36 are used when used for a long time in a severe environment. Dust may enter between the peripheral surface portion and affect the dustproof and waterproof function of the lip portion 41.

  In order to improve such a point, recently, as shown in FIG. 6, a seal packing 42 constituted by a diaphragm packing is used as a seal member, and this seal packing 42 is placed between a case 45 and an operation plunger 47. There is an illuminated pushbutton switch in which the outer peripheral portion is fixed to the case 45 and the operation plunger 47, respectively.

That is, as shown in FIG. 7, the seal packing 42 has an outer peripheral mounting base 43 on the outer peripheral portion of the packing body 42A and an inner peripheral mounting base 44 on the inner peripheral portion. A case-side fitting portion 46 is provided on the inner peripheral side of the case 45, and a plunger-side fitting portion 48 is provided on the outer peripheral portion of the operation plunger 47. Then, the inner peripheral mounting base portion 44 is fitted to the plunger side fitting portion 48, and the outer peripheral mounting base portion 43 is fitted to the case side fitting portion 46, whereby the seal packing 42 is connected to the case 45 and the operation plunger 47. Between the case 45 and the operation plunger 47 (see Patent Document 1).
Japanese Patent Laid-Open No. 07-282680

  However, in the illuminated pushbutton switch disclosed in Patent Document 1, the inner peripheral side of the seal packing 42 is fitted by fitting the inner peripheral mounting base 44 of the seal packing 42 to the plunger side fitting portion 48. While being attached to the operation plunger 47, the outer peripheral mounting base portion 43 of the seal packing 42 is fitted into the case side fitting portion 46, and a part of the case side fitting portion 46 is cut up and crimped to seal the seal. Since the outer peripheral side of the packing 42 is attached to the case 45, the outer peripheral side of the sealing packing 42 is intermittently attached to the case 45, and the case 45 is evenly distributed over the entire periphery. There is a case where a portion to be attached to the case 45 is formed without being pressed and is bent, which may affect the sealing property by the seal packing 42 and the life of the seal packing. .

  The present invention has been made in order to improve such conventional points, and the object of the present invention is to ensure the installation of the seal packing to the switch operating portion and the case, An object of the present invention is to provide a pushbutton switch that can improve the sealability and the life of the seal packing by using the seal packing and can be used for a long time.

To achieve the above object, a push button switch according to the present invention, a switch portion, and a case supporting the switch unit, the switch operation unit incorporated in the casing, and the said casing switch operating unit A packing for sealing and a packing presser member, and the case is formed with a packing presser member engaging portion and a case side packing fitting portion, and the packing presser member engaging The portion has a pedestal portion, the top portion of the pedestal portion is a conical surface inclined toward the center side of the case, and the case side packing fitting portion is formed on the inner peripheral surface portion of the pedestal portion. continuing a peripheral surface portion, wherein the top Yes constituted by V type groove formed by the conical surface of the reverse slope, the switch operation unit is operated to perform a contact switching of the switch unit by the operation of the switch operation portion And plunger, have a push button portion is fixed to the operating rod, the plunger-side packing fitting portion on the outer peripheral portion of the operating plunger, the inner peripheral portion of the push button portion is a push button-side packing fitting portion There Yes formed respectively, wherein the inner to the peripheral portion inner circumferential side mounting base of the sealing packing, the outer peripheral portion Yes forms each outer circumferential side mounting base, wherein the gland member is inclined direction of said top portion same direction a frustoconical inclined, the inner circumferential side of the mounting base while held between the push-button side packing fitting portion and the plunger-side packing fitting portion, the casing side the outer peripheral side attaching base and see write fitted in the packing fitting portion, said gland member engaging said packing gland member to engagement portion being in contact with the engaging said top, said gland member and the case side path of said outer peripheral side attaching base portion in It is characterized in that it has push locking the Kin fitting portion.

With this configuration, the inner peripheral side mounting base of the seal packing is sandwiched between the plunger side packing fitting portion and the push button side packing fitting portion, and the outer peripheral side mounting base is fitted into the case side packing fitting portion. The seal pressing member engaging portion is engaged with the packing pressing member engaging portion, and the outer peripheral side mounting base is pushed and locked into the case side packing fitting portion by the packing pressing member, so that the switch operating portion and the case of the seal packing Therefore, it is possible to improve the sealing performance by the seal packing and the life of the seal packing, and it is possible to use the push button switch for a long time. Further, with this configuration, the top of the pedestal is a conical surface that is inclined toward the center of the case, and the packing pressing member is inclined in the same direction as the inclination of the top, and the packing pressing member is at the top. When the packing presser member comes into contact with the outer peripheral side mounting base in order to press and lock the outer peripheral side mounting base of the seal packing into the case side packing fitting part with this packing pressing member In addition, the outer peripheral side mounting base can be prevented from approaching the center of the case, and the outer peripheral side mounting base can be reliably locked to the case. Moreover, since the packing pressing member has a frustoconical shape that is inclined in the same direction as the inclination direction of the top portion, the packing pressing member has high rigidity and can reliably press the outer peripheral side mounting base.

  Here, the seal packing corresponds to, for example, a diaphragm packing, and the plunger side packing fitting portion corresponds to, for example, a concave groove formed on the outer peripheral portion of the operation plunger, and the push button side packing fitting portion Is constituted by, for example, being pinched so as to be crushed by the inner peripheral portion of the reflecting plunger and the outer peripheral portion of the operation plunger, which are components of the push button portion.

  Further, the push button switch according to the present invention is the above-described push button switch according to the present invention, wherein the packing pressing member has a ring shape, and a large number of edge portions are formed on the outer peripheral edge thereof. The joint portion has a peripheral wall portion on the outer peripheral portion thereof, and the packing press member is engaged with the packing press member engaging portion by biting the edge portion into the peripheral wall portion. It is.

  With this configuration, the packing presser member can engage the packing presser member with the packing presser member engaging portion by biting a large number of edge portions of the outer peripheral edge thereof into the peripheral wall portion. Push-in locking of the side mounting base to the case side packing fitting portion can be ensured evenly and reliably over the entire circumference.

  Here, the packing pressing member corresponds to, for example, a metal ring having a polygonal outer peripheral edge portion and a large number of edge portions.

  According to the pushbutton switch according to the present invention, the inner peripheral side mounting base of the seal packing is sandwiched between the plunger side packing fitting portion and the pushbutton side packing fitting portion, and the outer peripheral side mounting base is used as the case side packing fitting portion. The seal retainer is engaged with the packing retainer engaging portion, and the outer periphery side mounting base is pushed and locked into the case side seal fit portion with this seal retainer. The switch can be securely attached to the switch operating portion and the case. For this reason, the sealability by the seal packing and the life of the seal packing are improved, and the push button switch can be used for a long time.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  An embodiment of the present invention is shown in FIGS. FIG. 1 is a cross-sectional view of an essential part showing an embodiment of the pushbutton switch of the present invention, FIG. 2 is an enlarged view of portion A of FIG. 1, FIG. 3 is a perspective view of a packing presser member, and FIG. It is a longitudinal cross-sectional view when operating a pushbutton part in FIG.

  The push button switch according to the present invention includes a switch unit 1 and a switch operation unit 2 for operating the switch unit 1.

  The switch unit 1 includes a switch cover 1A, a movable element (not shown) provided on the upper surface of the switch cover 1A in FIG. 1, an illumination lamp 1B disposed on the upper surface, and the switch cover 1A. The switch cover 1 </ b> A has a locking projection 1 </ b> C at the center of the front and rear surfaces in FIG. 1. The contact mechanism closes the contact (not shown) by pushing the mover against the spring force of the return spring, and lifts the mover by the spring force of the return spring by releasing the mover. The contact is opened, and the back spring function of the switch operation unit 2 is also provided.

  The switch operation unit 2 includes a case 3, an operation plunger 11 that opens and closes a contact mechanism by operating the above-described movable element by operating the switch operation unit 2, a push button unit 12 fixed to the operation plunger 11, And a dustproof and waterproof seal portion 23.

  The case 3 has a cylindrical push button accommodating portion 4 and a cylindrical mounting portion 5 having a smaller diameter than the push button accommodating portion 4, and a screw portion 5 </ b> A is formed on the outer peripheral portion of the attaching portion 5. In addition, a pair of locking leg portions 6 project from the end of the mounting portion 5, and the locking leg portions 6 are provided with locking hole portions 6 </ b> A.

  As shown in FIG. 1, a conical surface portion 8 centering on the center A of the case 3, a packing pressing member engaging portion 9, and a case side packing fitting are provided on the inner peripheral edge portion of the bottom surface portion 7 of the push button accommodating portion 4. The part 10 is formed concentrically. That is, as shown in FIG. 2, the packing pressing member engaging portion 9 is one step lower than the conical surface portion 8, and the packing pressing member engaging portion 9 includes a peripheral wall portion 9 </ b> A continuous with the conical surface portion 8, and the peripheral wall portion. 9A has a pedestal portion 9C that separates the recessed groove portion 9B, and the top portion 9D of the pedestal portion 9C has a conical surface inclined toward the center A side of the case 3. Moreover, the case side packing fitting part 10 is comprised by the V-shaped groove part formed by 10 A of peripheral surface parts connected to the internal peripheral surface part of the base part 9C, and the conical surface part 10B of the top part 9D inclining reversely.

  The operation plunger 11 has a cylindrical plunger main body 11A. A plunger side packing fitting portion 17 and a seal packing receiving portion 18 are formed on the outer peripheral portion of the plunger main body 11A. The fitting portion 17 is configured by forming a concave groove portion 17A in the circumferential direction on the outer peripheral portion of the plunger main body 11A. Further, the seal packing receiving portion 18 is constituted by a step portion 11D of a thin portion 11B and a thick portion 11C of the plunger main body 11A.

  The push button portion 12 is composed of a reflective plunger 13, a diffusion plate 14, an engraving plate 15, and a cap 16.

  The reflection plunger 13 includes a cylindrical fitting portion 19, a funnel-like reflection portion 20 that is continuous with the end portion of the fitting portion 19, and a cylindrical holding portion 21 that is continuous with the end portion of the reflection portion 20. In addition, a push button side packing fitting portion 22 made of a concave groove portion is formed on the inner peripheral portion of the fitting portion 19 so as to be positioned on the end side thereof.

  A diffusion plate 14 is placed on the holding portion 21 of the reflective plunger 13 (may be fixed by welding or adhesion), and an engraving plate 15 is detachably fitted on the diffusion plate 14. A cap 16 is put on the holding portion 21 so as to cover the engraving plate 15.

  The dustproof waterproof seal portion 23 is composed of a flexible seal packing 24 and a packing presser member 25. The seal packing 24 is constituted by a diaphragm packing, and is provided with a cylindrical and flexible packing body 24A. The inner peripheral end of the packing body 24A has a main portion of the packing body 24A. An inner peripheral mounting base 26 thicker than the thickness is formed, and an outer peripheral mounting base 27 thicker than the thickness of the main part is also formed at the outer peripheral end of the packing body 24A.

  As shown in FIG. 3, the packing presser member 25 is a metal ring and includes a reverse truncated cone-shaped member main body 25A. The inner peripheral edge 25a of the member main body 25A is a perfect circle, The outer peripheral edge 25b has a polygonal shape and a large number of edge portions 28 are formed.

  Then, the fitting portion 19 of the reflective plunger 13 is fitted to the end of the operation plunger 11 in a state where the inner peripheral side mounting base portion 26 of the seal packing 24 is fitted in the concave groove portion 17A of the plunger side packing fitting portion 17. Thus, the portion protruding from the concave groove portion 17A of the inner peripheral side mounting base portion 26 of the seal packing 24 is fitted into the push button side packing fitting portion 22 so that the plunger side packing fitting portion 17 and the push button side packing fitting portion are fitted. 22, the inner peripheral side mounting base portion 26 of the seal packing 24 is clamped in a crushing state.

  The case 3 has the pair of locking legs 6 along the front and rear surface portions of the switch cover 1A of the switch portion 1, and the locking protrusions 1C provided on the front and rear surface portions of the case 3 as locking hole portions. The operation plunger 11 is inserted into the case 3, and the illumination lamp 1 </ b> B is inserted into the operation plunger 11. In this case, the end of the operation plunger 11 is in contact with the mover of the switch unit 1.

  Then, in a state where the outer peripheral side mounting base portion 27 of the seal packing 24 is fitted into the case side packing fitting portion 10 of the case 3, the packing press member 25 is pushed into the packing press member receiving portion 9, and the packing press member 25 A number of edge portions 28 are bitten into the peripheral wall portion 9 </ b> A so that the packing presser member 25 is brought into contact with the base portion 9 </ b> C and fixed to the packing presser member receiving portion 9. The outer peripheral side mounting base portion 27 of the packing 24 is pressed evenly against the case side packing fitting portion 10, and the outer peripheral side mounting base portion 27 is attached to the case 3.

In this case, the seal packing 24 straddles the case 3 and the operation plunger 11, and its cross-sectional shape is U- shaped, and its end is received by the seal packing receiving portion 18. Dust and water (oil) that have entered the case 3 from the gap S between the inner peripheral surface of the push button accommodating portion 4 and the peripheral surface portion of the cap 16 of the push button portion 12 are formed between the operation plunger 11 and the mounting portion 5 of the case 3. The switch part 1 side is prevented from entering between.

  As shown in FIG. 1, the push button switch configured as described above has an operation panel between the packing 29 </ b> A and the rotation stopper 29 </ b> B by tightening the attachment ring 29 provided on the screw portion 5 </ b> A of the attachment portion 5 of the case 3. P is sandwiched and attached to the operation panel P.

  The switch operation of the switch unit 1 is performed by manually operating the push button unit 12 so that the operation plunger 11 reciprocates and opens and closes the contact of the contact mechanism of the switch unit 1 via the movable element.

  When the push button portion 12 is operated, as shown in FIG. 4, the seal packing 25 is elastically deformed downward and bent in FIG. 4, and returns to the original position shown in FIG. 1 when the push button portion 12 is released.

As described above, according to the embodiment of the present invention, the inner peripheral side mounting base portion 26 of the seal packing 24 is sandwiched between the plunger side packing fitting portion 17 and the push button side packing fitting portion 22, and the sealing packing is used. In a state where the outer peripheral side mounting base 27 of 24 is fitted in the case side packing fitting portion 10, the packing presser member 25 is engaged with the packing presser member engaging portion 9, and the packing presser member 25 is almost entirely surrounded. Since the outer peripheral side mounting base portion 27 is evenly pushed and locked into the case side packing fitting portion 10, the seal packing 24 can be securely attached to the switch operating portion 11 and the case 3. It improves the sealing performance and lifetime of the sealing gasket 2 4 by the sealing gasket 2 4, allowing long-term use of the push button switch.

Further, according to the embodiment of the present invention, the packing presser member 25 is formed by causing the many edge portions 28 of the outer peripheral edge thereof to bite into the peripheral wall portion 9A of the packing presser member engaging portion 9. It can be engaged with the presser member engaging portion 9 to ensure that the packing presser member 25 pushes and locks the outer peripheral side mounting base portion 27 of the seal packing 24 into the case side packing fitting portion 10. it can.

  Further, according to the embodiment of the present invention, the top portion 9D of the pedestal portion 9C of the packing presser member engaging portion 9 is a conical surface inclined toward the center side of the case 3, and the packing presser member 25 is the top portion. In the state where it is inclined in the same direction as the inclination direction of 9D and the packing pressing member 25 is in contact with the top portion 9D, the outer peripheral side mounting base 27 of the seal packing 24 is fitted to the case side packing with the packing pressing member 25. In order to be pushed and locked to the portion 10, it is possible to prevent the outer peripheral side mounting base portion 27 from approaching the center side of the case 3 when the packing presser member 25 comes into contact with the outer peripheral side mounting base portion 27. Thus, the outer peripheral side mounting base 27 can be reliably locked to the case 3. Moreover, since the packing pressing member 25 has a frustoconical shape that is inclined in the same direction as the inclination direction of the top portion 9D, the packing pressing member 25 has a high rigidity and can hold the outer peripheral side mounting base 27 of the sealing packing 24. It can be done reliably.

  According to the push button switch of the present invention, the inner peripheral side mounting base of the seal packing is sandwiched between the plunger side packing fitting portion and the push button side packing fitting portion, and the outer peripheral side mounting base of the seal packing is placed on the case side. By engaging the packing presser member with the packing presser member engaging portion in the state of being fitted in the packing fitting portion, and pushing the outer peripheral side mounting base into the case side packing fitting portion with this packing presser member. Since the seal packing can be securely attached to the switch operating part and the case, the sealability by the seal packing and the life of the seal packing are improved, and the push button switch has a long service life. It has the effect that it can be used, and it is suitable as an illuminated pushbutton switch that is attached to a panel such as a control box. It is useful for a push button switch having.

It is principal part sectional drawing which shows one Example of the pushbutton switch which concerns on this invention. It is an enlarged view of the A section of FIG. It is a perspective view of a packing pressing member. It is a longitudinal cross-sectional view when the pushbutton part is operated in the pushbutton switch which concerns on this invention. It is a longitudinal cross-sectional view of the conventional pushbutton switch. It is a longitudinal cross-sectional view of the other conventional pushbutton switch. It is an enlarged view of the B section of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Switch part 1A Switch cover 1B Illumination lamp 2 Switch operation part 3 Case 4 Push button accommodating part 5 Mounting part 6 Locking leg part 9 Packing presser member engaging part 9A Peripheral wall part 9B Concave groove part 9C Base part 9D Top part 10 Case side packing fitting Joint portion 10A Peripheral surface portion 10B Conical surface portion 11 Operating plunger 11A Plunger body 12 Push button portion 13 Reflecting plunger 14 Diffusion plate 15 Engraving plate 16 Cap 17 Plunger side packing fitting portion 18 Seal packing receiving portion 22 Push button side packing fitting portion 23 Dustproof Waterproof seal part 24 Seal packing 25 Packing holding member 26 Inner peripheral side mounting base 27 Outer peripheral side base 28 Edge part

Claims (2)

A switch unit, and a case supporting the switch unit, the switch operation unit incorporated within said casing, a sealing gasket disposed across between said casing switch operating unit, and the gland member equipped with a,
The case has a packing presser member engaging portion and a case side packing fitting portion, the packing presser member engaging portion has a pedestal portion, and the top portion of the pedestal portion is The case-side packing fitting portion is formed by a peripheral surface portion that is continuous with the inner peripheral surface portion of the pedestal portion, and a conical surface portion that is inclined reversely to the top portion. Yes constituted by the mold groove, the switch operating unit, have an operating plunger for performing contact opening and closing of the switch unit by the operation of the switch operation unit, and a push button portion is fixed to the operating rod, wherein plunger-side packing fitting portion on the outer peripheral portion of the operation plunger, the inner peripheral portion of the push button portion is Yes forms push button side packing fitting portion, respectively, the inner the inner peripheral portion of the front Symbol sealing gasket periphery Side mounting base is the outer periphery The outer peripheral side attaching base portion is Yes formed respectively, wherein the gland member is a frusto-conical shape which is inclined in the same direction as the inclination direction of said top portion,
Said inner circumferential side mounting base while held between the plunger-side packing fitting portion and said push button side packing fitting portion, seen write fitted the outer peripheral side mounting base on the case side gasket fitting portion, said gland member in a state where the gland member is brought into contact with engaging said top portion engaging portion, and characterized in that said outer peripheral side attaching base portion in the gland member to push locking said case side gasket fitting portion Push button switch to do.   The packing pressing member has a ring shape, and a large number of edge portions are formed on the outer peripheral edge thereof. The packing pressing member engaging portion has a peripheral wall portion on the outer peripheral portion thereof, and the peripheral wall 2. The pushbutton switch according to claim 1, wherein the packing pressing member is engaged with the packing pressing member engaging portion by causing the edge portion to bite into the portion.