JP2545386Y2 - Dustproof contact block - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a dust-proofed contact block, and more particularly to a structure for improving the dust-proofing property.

[Prior Art] A contact block is generally used for signal input to various machines. As shown in FIG. 3, the contact block 2 is combined with a control unit 60, and is fixed to, for example, an operation panel 50M of the operation device 50. 50 through holes for 50M operation panel
The operation button 62 of the control unit 60 protrudes from the through hole 50a.

The contact block 2 has a built-in contact portion such as a microswitch (not shown). The contact portion usually has a fine structure, and if dust or the like adheres, there is a possibility that a conduction failure may occur. For this reason, it is necessary to perform dustproof processing so that dust and the like do not enter the operation device 50.

Conventionally, for example, annular rubber packing 71, 72
Was used. That is, the control unit 60
The annular rubber packings 71 and 72 are inserted into the, and positioned and fixed with the operation panel 50M interposed therebetween. The annular rubber packings 71 and 72 can prevent dust and water from entering through the through hole 50a.

[Problems to be Solved by the Invention] However, the above-mentioned conventional dust-proof processing has the following problems. In general, extremely fine dust is generated at a place where a textile machine or a paper processing machine is installed. Therefore, the operation device 50 used for the operation of such devices and the like is required to have more complete dustproofing.

However, the operating device 50 is usually provided with a lead hole 50t for leading out the lead wire 2R and the like. For this reason, dust enters the internal space 50S of the operating device 50 from the lead hole 50t. Even if rubber packing or the like is applied to the lead hole 50t (not shown), dust cannot be completely prevented because the dust is extremely fine. Further, there is a possibility that dust may enter through the case joints 50d and 50e of the operation device 50.

Some operating devices include a microcomputer or the like (not shown). In such an actuator,
A fan may be provided to prevent the temperature inside the operation device from rising. When the air is replaced by the fan, the internal space
It is not possible to prevent dust from entering the 50S. Furthermore, in the conventional contact block, when the operation button 62 is hit with, for example, an object, there is a possibility that the switch is unexpectedly operated.

Therefore, an object of the present invention is to provide a dust-proof contact block which can improve the integrity of dust-proof processing, can prevent conduction failure due to the attachment of dust and the like, and can prevent the contact portion from being opened and closed unexpectedly.

[Means for Solving the Problems] A dustproof contact block according to the present invention includes a housing having a built-in contact portion, one end of which is exposed to the outside of the housing, and which is movable in an operation direction or a return direction. A first operating shaft that is held and moves in the operating direction in response to a pressing operation from a pressing operation unit located outside; a first operating shaft that is movably held in the operating direction or the return direction; And
A second actuation shaft positioned to form an actuation space between the first actuation shaft and the first actuation shaft, the second actuation shaft moving in the actuation direction beyond the actuation space; Is transmitted to the contact portion via the first operating shaft, and is connected to the second operating shaft, the housing and the second operating shaft for opening and closing the contact portion, and is movable in response to the movement of the second operating shaft. And a movable airtight member provided between the first operating shaft and the movable airtight member for maintaining the airtightness of the contact portion. The movable airtight member is provided between the first operating shaft and the movable airtight member. A biasing portion for urging the movable airtight member toward the housing while energizing the housing, and a fixed airtight member fixed to the housing and for sealing the contact portion to the outside of the housing. It is characterized by.

[Operation] The dustproof contact block according to the present invention includes a movable airtight member movable in accordance with the movement of the second operation shaft. The movable airtight member is positioned so as to maintain the airtightness of the contact portion. Further, a fixed hermetic member for hermetically sealing the contact portion to the outside of the housing is provided. Therefore, it is possible to maintain the airtightness of the contact portion while securing the movement of the second operating shaft.

The urging unit urges the first operating shaft in the return direction and presses the movable airtight member toward the housing. Therefore, the movable airtight member is brought into close contact with the housing under the pressure of the urging portion.

Further, the second operating shaft is located so as to form an operating space between the second operating shaft and the first operating shaft. When the first operating shaft moves in the operating direction beyond the operating space, the movement is transmitted to the contact portion. It transmits and opens and closes the contacts. Therefore, even if the first operation shaft moves in the operation direction within the range of the operation space, the contact portion does not open or close.

[Embodiment] An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of the contact block 2. The contact block 2 is integrated with the control unit 60 and functions as an input device (see FIG. 3). The movement of each part of the contact block 2 when the operation button 62 of the control unit 60 is pressed will be described below with reference to FIG.

The housing 4 incorporates a microswitch 6 as a contact portion. From the shaft hole 41 of the housing 4, the pressing shaft 7, which is the first operating shaft, protrudes.
It is provided movably in the direction (return direction). When the pressing shaft head 7H of the pressing shaft 7 is pressed in the direction of the arrow 90 by pressing the operation button 62 of the control unit 60, the rod 8 as the second operating shaft is also similarly moved in the direction of the arrow 90. Pressed. That is, the bottom surface 7L of the pressing shaft 7 is
The rod 8 is moved in the direction of the arrow 90 by applying pressure by contacting the rod head 8H of the rod.

The space between the bottom surface 7L of the pressing shaft 7 of the pressing shaft 7 and the rod head 8H is the working space in the present embodiment. That is, the pressing shaft bottom surface 7L of the pressing shaft 7 is moved by an arrow 90 for a distance exceeding the working space.
When moved in the direction, the rod head 8H of the rod 8 is pressed. Therefore, when the moving distance of the pressing shaft 7 in the direction of the arrow 90 remains within the range of the working space, the rod 8 is not pressed.

The input element 6p of the microswitch 6 is located close to the rod bottom surface 8L of the rod 8, as shown in the figure. Rod 8
However, when the rod is moved according to the pressure from the pressing shaft 7, the rod bottom surface 8L pushes the input element 6p in the direction of arrow 90. The microswitch 6 is configured such that the movable element 6t selects either the stator 6a or 6b by switching the input element 6p in the directions of arrows 90 and 91. The state of each part when the pressing shaft 7 is pressed is not shown.

When the pressurization of the press shaft 7 is released, each part returns to the state before pressurization as follows. First, the input 6p of the microswitch 6 returns to the state shown in FIG. 1 by the microswitch spring 6s. Then, by the return force of the micro switch spring 6s, the rod bottom surface 8L is pushed up in the direction of the arrow 91, and the rod 8 is also positioned as shown in the figure. The pressing shaft 7 is pushed back in the direction of the arrow 91 by the coil spring 14 which is an urging portion located in contact with the pressing shaft bottom surface 7L.

Next, the dustproofness of the contact block 2 shown in FIG. 1 will be described. A bellows 10 as a movable airtight member is connected to the rod 8. The bellows 10 is a cylindrical rubber member, and the connection end 10K of the bellows 10 fits into the connection groove 8M of the rod 8. Then, a fixed end portion 10J which is the other end of the bellows 10 is fixed to the housing 4. Fixing member 1
Reference numeral 1 denotes a member for fixing and holding the fixed end 10J of the bellows 10.

As shown in FIG. 1, the fixed end of the bellows 10
10J is biased by the coil spring 14 via the fixing member 11. The bias of the coil spring 14 causes the bellows 10
The fixed end 10J is pressed against the housing 4. That is,
The coil spring 14 urges the operating shaft 7 in the direction of arrow 91 and presses the fixed end 10J of the bellows 10 toward the housing 4.

FIG. 2A shows a state where the rod 8 and the bellows 10 are inserted into the housing 4. After the rod 8 is inserted, the bellows 10 is attached using a jig 77. The connection end 10K of the bellows 10 is fitted into the connection groove 8M of the rod 8, and is located in the housing 4.

By connecting the bellows 10 to the housing 4 and the rod 8, it is possible to prevent dust or the like entering through the shaft hole 4J of the housing 4 from entering the microswitch 6, for example. That is, it is possible to maintain the airtightness of the microswitch 6 and prevent the occurrence of a conduction failure due to the attachment of dust between the mover 6t and the stator 6a or 6b.

Further, as described above, the fixed end portion 10J of the bellows 10 is pressed against the housing 4 by the bias of the coil spring 14. For this reason, the fixed end portion 10J of the bellows 10 can be brought into close contact with the housing 4, and the dustproof integrity can be enhanced.

The bellows 10 is formed of a movable rubber.
Therefore, when the rod 8 reciprocates in the directions of the arrows 90 and 91, the rod 8 can flexibly move accordingly. As described above, the bellows 10 flexibly responds to the movement of the rod 8, so that dustproofing can be performed without hindering the operability of the contact block 2.

Further, the contact block 2 is provided with a seal 12 as a fixed airtight member. For example, epoxy resin or the like is used for the seal 12, and is filled between the housing 4 and the base 6W of the microswitch 6. The seal 12 is located in a circumferential shape and maintains the airtightness of the microswitch 6.

The details of the sealing process will be described with reference to FIGS. 2B and 2C. 2B and 2C are perspective views of the housing 4 shown in FIG. 2A in the upside down direction. First, the microswitch 6 is inserted into the housing 4 (FIG. 2B), and then the seal 12 is filled between the housing 4 and the base 6W of the microswitch 6 (FIG. 2C).

The position of the seal 12 allows the microswitch 6
A gap between the base 6W and the housing 4 can be avoided. That is, it is possible to effectively prevent the occurrence of conduction failure due to dust adhesion or the like between the mover 6t and the stator 6a or 6b.

As described above, the provision of the bellows 10 and the seal 12 enables the microswitch to be positioned in a completely sealed area, maintains airtightness, and improves dustproofness. Since the housing 4 is integrally molded with resin, no gap is formed in the housing 4. That is, there is no possibility that dust or the like may enter through the housing 4, and the dustproofness is completely maintained.

Further, the bellows 10 and the seal 12 are small members, and do not require much space when disposed in the contact block. For this reason, this dustproofing can be applied to a conventional thin contact block as shown in the figure. Therefore, even for a small contact block, its dustproofness can be improved, and versatility with respect to conventional devices can be maintained.

[Effect of the Invention] The dustproof contact block according to the present invention includes a movable airtight member that is movable according to the movement of the operating shaft of the table 2. The movable airtight member is positioned so as to maintain the airtightness of the contact portion. Further, a fixed hermetic member for hermetically sealing the contact portion to the outside of the housing is provided.

That is, the airtightness of the contact portion can be maintained while ensuring the movement of the second operating shaft. Therefore, more complete dust prevention can be achieved, and conduction failure due to adhesion of dust or the like can be prevented. In addition, it is not necessary to perform dustproofing on the entire operation panel including the contact block, so that inexpensive dustproofing can be realized.

The urging unit urges the first operating shaft in the return direction and presses the movable airtight member toward the housing. That is, the movable airtight member is brought into close contact with the housing under the pressure of the urging portion. In this way, the movable airtight member comes into close contact with the housing by being pressed by the urging portion,
Further, complete dust prevention can be realized.

In addition, since the movable airtight member is pressed toward the housing by using an urging portion for urging the first operating shaft in the return direction, an urging portion for pressurizing the movable airtight member is separately provided. , And it is possible to realize complete dustproofing without increasing the number of parts.

Further, the second operating shaft is located so as to form an operating space between the second operating shaft and the first operating shaft. When the first operating shaft moves in the operating direction beyond the operating space, the movement is transmitted to the contact portion. It transmits and opens and closes the contacts. That is, even if the first operation shaft moves in the operation direction within the range of the operation space, the contact portion does not open or close. Accordingly, it is possible to prevent the contact portion from being opened and closed unexpectedly.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing an embodiment of a dustproof contact block according to the present invention, FIG. 2A is a perspective view showing a state in which a rod and a bellows are inserted into a housing, FIG. 2B is a perspective view showing a state where the microswitch is inserted into the housing, FIG. 2C is a perspective view showing a state where the housing and the microswitch are sealed, and FIG. 3 is a conventional dustproof processing. FIG. 4 is a cross-sectional view of the operation device for explaining the operation. 2 Contact block 4 Housing 6 Micro switch 7 Push shaft 8 Rod 10 Bellows 12 Seal

Claims (1)

(57) [Scope of request for utility model registration] 1. A housing having a built-in contact portion, one end of which is exposed to the outside of the housing, and a first operating shaft held by the housing so as to be movable in an operating direction or a return direction. A first operation shaft that moves in the operation direction in response to a pressing operation from a pressing operation unit that is located, the first operation shaft is movably held in the operation direction or the return direction, and an operation space is formed between the first operation shaft and the first operation shaft. The second located to form
An actuation shaft, which receives a movement of a first actuation shaft that moves in an actuation direction beyond an actuation space, transmits a pressing operation from a pressing operation portion to a contact portion via the first operation shaft, and It is connected to the second operating shaft to be opened and closed, the housing, and the second operating shaft, is formed so as to be movable according to the movement of the second operating shaft, and is provided for maintaining the airtightness of the contact portion. A movable airtight member, which is provided between the first operating shaft and the movable airtight member;
An urging portion for urging the first operating shaft in the return direction and pressing the movable airtight member toward the housing, which is fixed to the housing to make the contact portion airtight to the outside of the housing. A dustproof contact block, comprising: a fixed airtight member;