JP5158963B2 - Switch structure - Google Patents

Description

  The present invention relates to a switch structure that is used by being incorporated in a measuring instrument such as an insulation resistance meter.

  A measuring instrument such as an insulation resistance meter normally has a switch structure for turning on a switch at the start of measurement or turning off the switch at the end of measurement.

FIG. 6 is an explanatory diagram showing again the switch structure shown as a partial cross-sectional view in FIG.
Japanese Utility Model Publication No. 4-72526

  According to the figure, the housing 1 is comprised by the upper case part 2 and the lower case part which is not shown in figure. The operation plate 3 includes a pair of support shafts 3a integrally formed on both the left and right sides thereof, and is slidably supported by an inverted U-shaped groove (not shown) provided on the upper case portion 2 side. ing.

  Further, the operation plate 3 is formed as a cam 5 whose back end 4 side faces the switch plate 7, and its start end 6 side is formed in a substantially L shape so as to cover a part of the upper case portion 2.

  The switch plate 7 has its back end always pushed up by the urging force of the tension coil spring S. By pushing down the back end 4 side of the operation plate 3 in the direction of the arrow, the contact portion 8 with the upper case 2 is provided. Is forcibly pushed down as a fulcrum.

  The switch plate 7 is pressed down against the urging force of the tension coil spring S, thereby pressing the pressure contact 9a of the switch 9 fixed to the upper case portion 2 side to turn it on. Becomes measurable.

  Further, the operation plate 3 is rotated about the support shaft 3a by lifting the starting end 6 side and rotating 90 degrees or more in the direction of the arrow under such a switch-on state. By being pushed down, the pressed state to the contact 9a is maintained, and a state where continuous measurement is possible can be made.

  However, in the case of the switch structure shown in FIG. 6, water liquid and dust such as raindrops can easily enter between the upper case portion 2 and the operation plate 3, which is not suitable for field work outdoors. It was.

  Further, the switch structure shown in FIG. 6 has a problem of increasing the product cost due to an increase in the number of constituent members and the number of screws used.

  Furthermore, in the case of the switch structure shown in FIG. 6, there is a problem that adjustment work is required after assembly because the positional tolerance between the cam 5 of the operation panel 3 and the switch 9 is large.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems of the prior art, and it is an object of the present invention to provide a switch structure that can reduce the number of constituent members and eliminate the need for adjustment after assembly while making it difficult for water and dust to enter. .

  The present invention has been made to achieve the above object, the operation plate is supported on the case side so as to be movable up and down via a pair of support shafts having one end side as an open end and the other end side, A support box fixed to the case side by forming a lifting bearing for the support shaft of the operation plate with the case side, and supported by a bearing formed between the support box and the case side A pair of support shafts are provided at one end thereof, and a pressure contact portion provided vertically is provided at the other end side to receive a pressing force from the other end side of the operation plate, and each support of the plate main body portion. An intervening plate having a pair of forwardly inclined flexible arms extending so that each open end abuts the bottom surface of the support box from a position in the vicinity of the shaft; and the intervening plate is pressed from the operation plate. Can be tilted forward under pressure The most important thing is that it comprises at least a printed circuit board that is fixed on the case side with a switch that has an electric circuit closed by the pressure generated by the pressure contact portion driven against the repulsive force of the arm portion. Features.

  In this case, when the operation plate is rotated in the opening direction by about 90 degrees or more via the support shaft, it is possible to maintain the pressure state of the switch by the pressure contact portion by pushing down the interposition plate. It is preferable to have a pressing piece portion to be provided.

  According to the first aspect of the present invention, the operation plate and the interposition plate are arranged via the upper case portion and the support box, so that it is possible to effectively enter the liquid such as raindrops and dust into the printed circuit board side. Therefore, it can be suitably used for field work outdoors. Moreover, since the whole can be formed with a reduced number of constituent members without incorporating a tension coil spring or the like, the product cost can be reduced as much. Furthermore, the switch provided on the printed circuit board can be easily turned on / off based on the relative force relationship between the pressing piece provided on the operation plate and the repulsive force generated by the forward-flexible flexible arm provided on the interposition plate. Since it can be turned off, adjustment work after assembling is not required, and workability can be improved.

  According to the second aspect of the present invention, the switch-on state can be maintained by simply rotating the operation plate toward the end in the opening direction by approximately 90 degrees, so even if the measurement time is increased to some extent, it is flexible. It can be made to correspond.

  FIG. 1 is an exploded perspective view showing an example of the present invention with a part thereof omitted, FIG. 2 is an explanatory view of a side structure with a part opened after assembly, and FIG. 3 is a part after assembly. The explanatory drawing of a typical longitudinal section structure is shown, respectively.

  According to these drawings, the operation plate 11 supported to be movable up and down on the upper case portion 22 side constituting the case 21, the plate main body portion 42 including the press contact portion 46, and a pair of forward tilting flexible arm portions. The intervening plate 41 having 48 and 48, a support box 51 fixed to the upper case portion 22 side, and a switch 62 are sandwiched between the upper case portion 22 and the lower case and are fixed to the case 21 side. The entire printed circuit board 61 forms a switch structure.

  Among these, the operation plate 11 is formed by providing one end 12 side as an open end 13 and a pair of support shafts 15 on the left and right sides located on the other end 14 side. Further, when the operation plate 11 is rotated in the opening direction by about 90 degrees or more via the support shaft 15, the pressure on the switch 62 by the press contact portion 46 can be maintained by pushing down the interposition plate 41. A pressing piece 16 is formed.

  In this case, the pressing piece portion 16 closes the curled portion 17 that extends downwardly from the length direction on the other end 14 side of the operation plate 11 and the left and right open end sides of the curled portion 17. The side wall portion 18 is provided so as to be suspended. Incidentally, each support shaft 15 in the illustrated example protrudes from a substantially central position of each side wall portion 18 in a direction orthogonal to the surface direction.

  The entire case 21 is formed, for example, under a housing structure in a measuring instrument. Although the main part of the case 21 is shown partially extracted in the illustrated example, the entire case 21 is shown as an upper case part 22. And a lower case portion (not shown).

  That is, the upper case portion 22 has a concave portion 23 having an opening surface size slightly larger than the surface size of the operation plate 11 on the upper surface, which is partitioned into the left and right side wall portions 24 and the bottom wall portion 25, and one end 22a. It is formed with the side open.

  In addition, each side wall portion 24 is provided with a step portion 26 on which the operation plate 11 is placed with the horizontal direction as a plane direction near one end thereof, and the operation plate 11 is pushed in by being continuous with the step portion 26 near the other end. The front inclined surface portion 27 is provided.

  Further, the upper case portion 22 has a short groove 28 that opens the lower surface of each side wall portion 24 near the one end 22a and rotatably supports the interposition plate 41 side, and each side wall portion 24 on the other end 22b side. A long slot 29 that is long in the vertical direction and supports the operation plate 11 side so as to be able to move up and down and rotate is formed.

  Moreover, the upper case portion 22 is a window in which a circular hole 32 for visually confirming the intervening plate 41 in the approximate center of the bottom wall portion 25 has a substantially rectangular shape on the other end 22b side located in the vicinity of the circular hole 32. Each hole 33 is formed. Reference numeral 35 in the figure denotes one end side hooking claws for hooking on the one end 52 a side of the support box 51, and 36 denotes a pair of other ends for hooking on the other end 52 b side of the support box 51. The side hooking claws are respectively shown and the support box 51 can be integrally attached to the upper case portion 22 side by hooking these hooks.

  The intervening plate 41 has a pair of support shafts 44, 44 supported by a bearing 37 formed between the support box 51 and the short groove 28 of the upper case 22, and press-contacted to one end 43 side thereof. A plate body 42 that is provided with a portion 46 on the other end 45 side and receives a pressing force from the other end 14 side of the operation plate 11, and an open end side from a position in the vicinity of each support shaft 44 of the plate body 42. The abutment portion 49 is formed with a pair of forward inclined flexible arm portions 48 and 48 extending so as to abut on the deep bottom portion 52 b side of the bottom plate portion 52 of the support box 51. Note that reference numeral 47 in the drawing denotes a stopper projecting in a substantially obliquely cut cylindrical shape from the lower surface side of the plate main body 42.

  The support box 51 includes a low seat height wall portion 53 formed on the bottom plate portion 52 on the one end 51a side, a portal wall portion 54 formed on the other end 51b side, and the low seat height wall portion 53 and the portal wall portion 54. And a high-sitting wall 55 that connects the left and right sides, and an enclosure space 56 that can accommodate the intervening plate 41 side excluding the pressure contact portion 46 is secured inside.

  Further, the bottom plate portion 52 in the support box 51 is formed with a step having a shallow bottom portion 52a near the one end 51a and a deep bottom portion 52b near the other end 51b. The other end 45 side of the intervening plate 41 can be dropped through. Note that a positioning cylinder 58 is protruded from the outer surface of the bottom plate 52 near the other end 51b and inserted into a circular hole 53 provided in the printed circuit board 61.

  Further, in the support box 51, a shallow groove 52a on one end 51a side has a one-side curved groove 59 formed along each high seat high wall portion 55, and a deep bottom portion 52b on the other end 51b side similarly has each high seat. The other-side curved groove 60 formed along the high wall portion 55 is formed under a positional relationship in which each opening position is the same height.

  Further, the gate-shaped wall portion 54 in the support box 51 is formed to have a notch portion 57 for projecting it while securing a movable range space of the press-contact portion 46 of the interposition plate 41 at the center portion thereof. .

  The printed circuit board 61 is formed by mounting necessary electronic components on a printed wiring board formed with a conductive pattern on the surface of an insulating substrate and the like, and is soldered. It is clamped by the side case and fixed to the case 21 side.

  Moreover, when the other end 45 side of the interposition plate 41 is pushed into the printed circuit board 61 via the pressing piece portion 16 located on the other end 14 side of the operation plate 11, the printed circuit board 61 is opposed to the pressure contact portion 46. A switch 62 that closes the electric circuit by the pressure received from the pressure contact portion 46 is provided.

  Next, the assembly procedure of the switch structure according to the present invention will be described below. In actual assembly, the upper case portion 22 is turned over, and the operation plate 11, the interposition plate 41, and the support box 51 are assembled from above. However, the assembly procedure in this specification will be described in relation to the arrangement relationship in the illustrated example for the convenience of explanation. That is, first, the operation plate 11 is fed from below through the window hole 33 of the upper case portion 22, and the respective support shafts 15 are individually arranged in the corresponding long grooves 29.

  Next, the upper case portion 22 has a press-contact portion 46 projecting from between the pair of latching claws 35, 35, and the support shaft 44 is positioned separately in the short groove 28. Deploy.

  Thereafter, a support box 51 that exposes the surrounding space 56 is fed into the upper case portion 22 from below. In this case, the support box 51 has a gate-shaped wall portion 54 which is a pair of the other end side latching claws 36 and 36 of the upper case portion 22, a one-side curved groove 59 and a short-side groove 28, and the other-side curved groove 60. Are pushed in with the long grooves 29 facing each other, and are latched by the one end side latching claws 35 and the pair of other end side latching claws 36, 36, so that the upper case portion 22 side. It is attached integrally.

  Further, when the support box 51 is attached to the upper case portion 22 in this way, the one-side curved groove 59 of the support box 51 faces the short groove 28 of the upper case portion 22 so as to face each other. The bearing 37 for supporting the support shaft 44 of the 41 has the other side curved groove 60 of the support box 51 facing the long groove 29 of the upper case portion 22 so that the support shaft 15 of the operation plate 11 is supported between them. The lift bearings 38 to be operated are respectively formed.

  Further, the support box 51 attached to the upper case portion 22 finishes its assembly by inserting the circular column portion 58 projecting from the lower surface of the bottom plate portion 52 into the circular hole 53 of the printed circuit board 61. .

  In other words, in the switch structure according to the present invention, the operation plate 11 is disposed via the recessed portion 23 of the upper case portion 22, and the interposition plate 41 is disposed between the upper case portion 22 and the support box 51. Since it is possible to effectively prevent water liquid such as raindrops and dust from entering the circuit board 61 side, it can be suitably used for field work outdoors.

  Moreover, since the switch structure according to the present invention can be formed with a reduced number of constituent members without incorporating a tension coil spring or the like, the product cost can be reduced as much.

  Furthermore, the switch structure according to the present invention has a relative relationship between the curl portion 17 in the pressing piece portion 16 provided on the operation plate 11 and the repulsive force generated by the forward tilting flexible arm portion 48 included in the interposition plate 41. Since the switch 52 included in the printed circuit board 61 can be easily turned on / off under the force relationship, the adjustment work after the assembly is unnecessary, and the workability can be improved.

  Next, the operation and effect of the switch structure assembled in this way will be described with reference to FIG. 1 and FIG.

  In order to close the electric circuit opened under the arrangement relationship shown in FIG. 2 and FIG. 3, first, the open end 13 located on the one end 12 side of the operation plate 11 is picked and pushed up, or the other end By pressing the finger on the 14 side and pushing it in, the boundary edge between the step portion 26 and the front inclined surface portion 27 of the upper case portion 22 is pivotally supported by the elevating bearing 38 as shown in FIG. The pressing piece 16 side of the operation plate 11 is forcibly pushed downward through the supporting shaft 15.

  The elevating bearing 38 formed between the upper case portion 22 side and the support box 51 side causes the operation plate 11 to fall in a seesaw shape via the fulcrum 39 while the other end 14 side is laid down while guiding the support shaft 15 in the pushing direction. Can be pushed in. For this reason, the pressing piece part 16 with which the operation plate 11 is provided will contact | abut the other end 45 side of the plate main-body part 42 in the interposition plate 41 shortly.

  The intervening plate 41 has a repulsive force generated by a pair of forward tilting flexible arm portions 48 and 48 supported by the deep bottom portion 52b of the bottom plate portion 52 of the support box 51 at the abutting portion 49. When a pressing force exceeding the repulsive force is applied, the other end 45 side of the plate main body 42 is further pushed so as to follow the pressing force of the operation plate 11 against the repulsive force, as shown in FIG. When the pressure contact portion 46 presses the switch 62 of the printed circuit board 61, the electric circuit is closed and the switch is turned on so that necessary measurement work can be started.

  When it is desired to maintain such a switch-on state for a certain period of time, the operation plate 11 is forcibly rotated through the support shaft 15 in an opening direction of approximately 90 degrees or more.

  When the operation plate 11 is forcibly rotated in this way, the curl portion 17 in the pressing piece portion rotates while pressing the plate main body portion 42 of the interposition plate 41, and as shown in FIG. When 46 presses the switch 62 of the printed circuit board 61, the switch-on state in which the electric circuit is closed can be stably maintained.

  In addition, the upper case portion 22 has a circular hole 32 through which the intervening plate 41 can be visually confirmed when the operation plate 11 is rotated in the opening direction of approximately 90 degrees or more to be in a continuous switch-on state. Since it is formed, for example, the switch-on state can be more easily confirmed by making only the intervening plate 41 a different color from the others.

  Thus, after the necessary measurement work is completed under the state shown in FIG. 4, a pair of forward tilts provided in the intervening plate 41 can be achieved by releasing the finger from the operation plate 11 side to eliminate the pressing biasing force. The plate main body 42 side automatically returns to the horizontal direction due to the repulsive force of the flexure arm 48. At this time, the pressure contact portion 46 is also automatically separated from the switch 62 of the printed circuit board 61, so that the electric circuit is opened. can do.

  Further, after the necessary measurement work is completed under the state shown in FIG. 5, the operation plate 11 that is forcibly rotated in the opening direction of about 90 degrees or more is moved to the original position via the support shaft 15. The plate main body 42 side automatically returns to the horizontal direction by the repulsive force of the pair of forward tilting flexible arm portions 48 included in the interposition plate 41, and the pressure contact portion 46 is also printed circuit board 61. Since the switch 62 is automatically separated from the switch 62, the switch circuit can be switched off with the electric circuit opened.

The disassembled perspective view which abbreviate | omits the example of this invention and shows it. Explanatory drawing which shows the side structure which cut open a part after an assembly. Explanatory drawing which shows the partial longitudinal cross-section structure after an assembly. Explanatory drawing at the time of pushing the operation plate in the state of FIG. 3 into a switch-on state. Explanatory drawing which shows the state by which a switch-on state is maintained when an operation plate is rotated in the opening direction about 90 degree | times or more. Explanatory drawing which shows the prior art example of switch structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Operation plate 12 One end 13 Open end 14 Other end 15 Support shaft 16 Pressing piece part 17 Curling part 18 Side wall part 21 Case 22 Upper case 22a One end 22b Other end 23 Recessed part 24 Side wall part 25 Bottom wall part 26 Step part 27 Front inclination Surface portion 28 Short groove 29 Long groove 32 Circular hole 33 Window hole 35 One end side latching pawl 36 Other end side latching pawl 37 Bearing 38 Lifting bearing 39 Support point 41 Intervening plate 42 Plate body portion 43 One end 44 Support shaft 45 The other end 46 pressure contact portion 47 stopper 48 forward inclined flexible arm portion 49 abutting portion 51 support box 51a one end 51b other end 52 bottom plate portion 52a shallow bottom portion 52b deep bottom portion 53 low seat high wall portion 54 gate-shaped wall portion 55 high seat high wall portion 56 Section 57 Notch portion 58 Column portion 59 One side curved groove 60 Other side curved groove 61 Printed circuit board 62 Switch 63 Circular hole

Claims (2)

An operation plate that is supported on the case side so as to be movable up and down via a pair of support shafts provided on the other end side with one end side as an open end;
A support box fixed to the case side by forming an elevating bearing of the support shaft of the operation plate with the case side;
The other end of the operation plate is provided with a pair of support shafts supported on bearings formed between the support box and the case side on one end side, and a press-contact portion suspended from the other end side. A plate main body that receives a pressing force from the side, and a pair of forward tilts extending from the positions of the plate main body in the vicinity of the respective support shafts so that the respective open ends abut against the bottom surface of the support box An intervening plate having a flexure arm,
The case is provided with a switch in which the electric path is closed by the pressure generated by the pressure contact portion that the intermediate plate receives a pressing force from the operation plate and is driven against the repulsive force of the forward tilting flexible arm portion. A switch structure comprising at least a printed circuit board fixed to a side. The operation plate includes a pressing piece that allows the pressure plate to maintain a pressure applied state to the switch by pushing down the interposition plate when rotated in the opening direction by approximately 90 degrees or more via the support shaft. The switch structure according to claim 1, further comprising a portion.

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