JP2008269880A - Lever device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lever device in which transmission of large motive power in a switch is possible while suppressing increase in the number of parts. <P>SOLUTION: In this lever device, a piece of lever 2 and three pieces of levers 3 are prepared. Blocks 5 are respectively installed at the total four levers in a state that the inner faces of coupling parts 23, 33 of the respective levers contact with U-shaped parts of the blocks 5 and that the inner side walls 52, 53 of the blocks 5 contact with the side walls of the coupling parts 23, 33. Next, a piece of shaft 4 is inserted through respective shaft insertion holes 41 in a state as shown in Fig.2, and next, spring pins 6 are inserted through the four pieces of respective through-holes 43 installed at the shaft 4 and through the respective through-holes 54 of the four pieces of the blocks 5 as shown in Fig.5. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lever device, and more particularly to a lever device suitable for power transmission in a switching device such as a switch or a circuit breaker.

  According to Patent Document 1 to be described later, in a lever device in which a pair of opposing levers are respectively supported by a support shaft via bearings, and a power transmission shaft is attached between the respective front end portions of the lever, a single plate is provided. A lever body that is bent into a U-shape and both side pieces are the two levers, and a round hole that is transparently provided at a position opposite to the two levers and into which the outer ring portions of the two bearings are respectively fitted; A notch groove formed by notching both the levers from the periphery of the round hole, and both side portions thereof are respectively inserted into the notch grooves, and a bearing spacing regulating protrusion fitted between the bearings, 2. Description of the Related Art Conventionally, a lever device including a holding plate having a protrusion for preventing a lever from engaging with both levers is known.

  In the above technique, the pair of opposing levers, which are both side pieces of the lever body, are rotatably supported on the support shaft by a bearing in which the outer ring portion is fitted in the round hole. When the protrusions are sandwiched between the bearings, the inward movement of the bearings is prevented, and the protrusions for preventing the levers of the holding plates from being connected to the levers are connected to the levers. Omission is prevented.

  By the way, when the lever device of Patent Document 1 is applied to a three-phase AC circuit breaker, there are problems that increase the number of parts and increase the cost because the lever is rotatably supported by the support shaft. In order to solve such a problem of Patent Document 1, there is a method in which the lever and the support shaft are welded and integrated in consideration of the large amount of power transmitted in the switch. However, in that case, there is a problem that the yield is poor due to welding distortion and the like, which is not suitable for mass production, resulting in an expensive product.

Reality 6-9417 (Claim 1)

  An object of the present invention is to propose a lever device capable of transmitting a large amount of power in a switch while suppressing an increase in the number of parts in consideration of the above-described problems in the prior art.

  The above problems are solved by a support device that rotatably supports the shaft, and a lever device that includes a lever fixed to the shaft by a mechanical fixing means such as a spring pin via an engagement member.

  In the lever device of the present invention, since the lever is fixed to the shaft by a mechanical fixing means such as a spring pin, the number of parts is extremely small compared to the above-mentioned Patent Document 1, so that it can be manufactured at low cost, Since the number of parts is small, the management of the variation in the dimensions and performance of the parts, which is always a problem when the number of parts is large, and the problem of deterioration in performance reliability of the finished product based on the variation are solved. In addition, since the above-described welding is not adopted in the present invention, the above-mentioned problem based on welding distortion is solved, and thus mass production with a high yield becomes possible. In addition, since it can transmit a large amount of power stably, it is useful as a switch or the like. Further, in the present invention, the shaft and the lever are fixed by a mechanical fixing means, so that it can be produced by a simple assembly operation. .

In the drawings shown below, the same parts are denoted by the same reference numerals.
Embodiment 1 FIG.
FIGS. 1 to 11 illustrate a first embodiment of the present invention. FIG. 1 is a front view of a three-phase AC switch including the entire lever device 1 according to the first embodiment, and FIG. 1 is a plan view of a part of FIG. 1, FIG. 3 and FIG. 4 are enlarged side views including a cross-sectional view of part 1 as seen from the direction AA in FIG. 1, and FIG. 6 is a cross-sectional view taken along line YY in FIG. 2, FIG. 7 is a development view of the lever 2 shown in FIG. 1, FIG. 8 is a development view of the lever 3 shown in FIG. FIG. 10 is a perspective view of the block 5 as an example of the engaging member in the present invention, and FIG. 11 is a cross-sectional view taken along the line V-V in FIG. 10. In FIG. 6, illustration of the connecting member existing in the insulating rod connecting hole 32 is omitted.

  The three-phase AC switch is connected to the operation mechanism 81, the link 82, the carriage 83, the spring 84, the three-phase AC switch 85, the vacuum valve 86, the fixed contact 87 of the vacuum valve 86, the movable contact 88, and the movable contact 88. And the lever device 1 of the first embodiment. The lever device 1 includes a lever 2, a lever 3, a shaft 4, a block 5 as an example of the engaging member, a spring pin 6 as an example of the mechanical fixing means, and a shaft support that rotatably supports the shaft 4. It is comprised from the apparatus (not shown).

  As shown in a developed view of FIG. 7, the lever 2 includes a pair of main lever portions 21 and 21, a pair of sub lever portions 24 and 24, a connecting portion 23 for connecting the main lever portions 21 and 21, and a main lever. The shaft insertion holes 41 and 41 provided in each of the portions 21 and 21, the link connection holes 22 and 22, and the spring connection holes 25 and 25 provided in the auxiliary lever portions 24 and 24, respectively. 23 and the main lever portions 21 and 21 are both bent in a U shape to have the same shape as the lever 3 shown in FIG. The main lever portions 21 and 21 are connected to one end of the link 82 through the link connecting holes 22 and 22, and the sub lever portions 24 and 24 are connected to the spring 84 through the spring connecting holes 25 and 25. Connected to one end. The other end of the spring 84 is coupled to the side wall of the carriage 83.

  As shown in a developed view of FIG. 8, the lever 3 has a pair of lever portions 31, 31, a connecting portion 33 that connects the lever portions 31, 31, and shaft insertion holes provided in each of the lever portions 31, 31. 41 and 41, and insulating rod connecting holes 32 and 32. Each boundary between the connecting portion 33 and the lever portions 31 and 31 is formed in a U-shape and has a shape shown in FIG.

  As shown in FIGS. 10 and 11, one surface of the block 5 is U-shaped having an upper surface 51, an inner wall 52, and an inner wall 53, and the spring pin 6 is inserted into the block portion. A through hole 54 is provided. The shaft 4 has a main body 42 having an outer diameter slightly smaller than the diameter of the shaft insertion hole 41, and the main body 42, and as shown in FIG. 2, one lever 2, three levers 3, A total of four through-holes 43 (see FIG. 5 for one through-hole 43), and supported to be rotatably supported by the shaft support device located at both ends of the main body 42 It consists of parts 44 and 44. The shaft support device includes a portion for supporting the supported portion 44 provided on the three-phase AC opening / closing portion 85 side and a portion provided on the opposite side thereof.

  Next, a method of assembling the lever device 1 will be described. Each unfolded body shown in FIGS. 7 and 8 is bent into a U-shape to produce one lever 2 and three levers 3, and the above four levers in total. In the state where the inner surface of each of the connecting portions 23 and 33 of each lever is in contact with the U-shaped portion of the block 5 and the inner side walls 52 and 53 of the block 5 are in contact with the side walls of the connecting portions 23 and 33. (See FIG. 5 for the case of lever 3), then, insert one shaft 4 into each shaft insertion hole 41 in the state shown in FIG. 2, and then each of the four through holes provided in shaft 4 The spring pin 6 is inserted into the through holes 54 of the 43 and four blocks 5 as shown in FIG. 5, so that one lever 2 and three levers 3 are coupled to the shaft 4 in the state shown in FIG. Can be obtained.

  In the present invention, in the state where the spring pin 6 is inserted, there may be a slight gap between the lower surface of the block 5 (the surface opposite to the upper surface 51) and the surface of the shaft 4, but if the gap is large, the shaft 4 may move up and down with respect to the lever 2 or the lever 3, and the operation of the lever device 1 may become unstable. Therefore, it is preferable that both the surfaces are in contact with each other as shown in FIG. In FIG. 5, the spring pin 6 may be inserted from the upper surface 51 side of the block 5 toward the through hole 43 of the shaft 4 or may be inserted from the through hole 43 side toward the upper surface 51. The direction from the 43 side is particularly preferable because the contact state between the block 5 and the shaft 4 becomes good.

  The assembled lever device 1 is connected to the link 82 of the operation mechanism 81 through the link connecting holes 22 and 22 and is connected to one end of the spring 84 through the spring connecting holes 25 and 25 to connect the insulating rod. It is connected to the trapezoidal tip of the insulating rod 89 through the holes 32, 32, and is thus in the state shown in FIG. The sub lever portions 24 and 24 are always pulled by the spring 84 in the right direction in the figure.

  In FIG. 1, a lever device 1 including one lever 2 and three levers 3 is installed between a link 82 connected to the operation mechanism unit 81 and an insulating rod 89 connected to the movable contact 88 of the vacuum valve 86. The lever 2 and the lever 3 are rotated about the shaft 4 as a rotation axis by the power from the operation mechanism 81 to move the movable contact 88 of the vacuum valve 86 up and down. That is, the operation of the operation mechanism portion 81 is transmitted to the shaft 4 through the lever 2 and is applied to the lever 3 with the shaft 4 as a rotation axis to open and close the contact.

  In FIG. 3, when a load is applied by the opening / closing operation, the block 5 has the inner wall 52 and the inner wall of the block 5 having a large cross-sectional area in which the load transmitted to the lever 3 is engaged with the lever 3 and the block 5. Since it can be received by each side surface of 53, there is an effect that the surface pressure can be reduced. Further, the spring pin 6 receives a force in the direction of the left arrow shown in FIG. 3 at the time of opening, and receives a force in the direction of the right arrow at the time of closing, but the spring pin 6 is strong against these shearing forces. Since it has a resistance characteristic, it can be applied to a lever of a switch that transmits a strong operating force.

  In the present invention, when the spring pin 6 is used as an example of the mechanical fixing means, the spring pin 6 is in contact with the shaft 4 or the block 5 only by the pressure contact force of the pin 6, so the lever device of the present invention. There is a possibility that the shaft 4 will fall down over time during operation for a long time and fall off the shaft 4. As shown in FIG. 4, when the distance between the upper surface of the carriage 83 as an example of the rigid body and the lower surface of the portion where the spring pin 6 of the shaft 4 is inserted is t, as shown in FIG. This is basically solved by making the contact length with the pin 6 (now t ′) larger than the distance t, preferably t ′ is at least 1.2 times, in particular 1.5 times the distance t. Good.

An example of a preferable specific dimension of the part that has become a problem in the discussion in the first embodiment is as follows. The outer diameter of the main body portion 42 of the shaft 4 is 38 mm, the diameter of the through hole 43 is 12 mm, and the through hole 54 of the block 5 The length is 12.2 mm, the outer diameter of the spring pin 6 before use is 12.5 mm, the length is 50 mm, t ′ is 12.2 mm, and the distance t is 6.5 mm.
In the present invention, in addition to the above example, the diameter of the through-hole 43 may be about 5 to 15, for example, 6 mm, 8 mm, 10 mm, 13 mm, and the like before use of the spring pin 6 in that case. The outer diameters are 6.4 mm, 8.6 mm, 10.6 mm, and 13.7 mm, respectively. As other dimension examples, the outer diameter of the main body 42 of the shaft 4 is 32 mm, the length of the spring pin 6 before use is 38 mm, t ′ is 6 mm, and t is 3 mm.

Embodiment 2. FIG.
FIGS. 12 and 13 illustrate the second embodiment of the present invention. FIG. 12 is a plan view of the second embodiment of FIG. 1 corresponding to FIG. 2, and FIG. It is an expanded view of the lever 7 corresponding to FIG. As shown in FIGS. 12 and 13, the second embodiment is different in that the lever 7 used therein is the one in which only the lever portions 31, 31 in the lever 3 are integrated with the lever 2. The others are the same as those in the first embodiment.

  That is, in FIG. 13, the lever 7 includes main lever portions 21 and 21, link connecting holes 22 and 22, connecting portions 23, sub lever portions 24 and 24, spring connecting holes 25 and 25, lever portions 31 and 31, and insulating rod connecting. It consists of holes 32 and 32 and shaft insertion holes 41 and 41. In the lever 7 used in the second embodiment, the main lever portions 21 and 21 and the lever portions 31 and 31 are positioned on a straight line as shown in FIG. 12, so that it is clear from the comparison between FIG. 2 and FIG. Further, since the lever device 1 is compact, the lever device 1 can be easily assembled and the occupied space can be reduced.

  As mentioned above, although this invention was demonstrated by Embodiment 1, 2, this invention is not restrict | limited to those embodiment, The various deformation | transformation along the subject of this invention and the mind of a solution means is carried out. Include. For example, the mechanical fixing means described above may be a screw or other means other than the spring pin 6. However, the spring pin 6 is particularly preferable in the present invention because it is superior in shear resistance compared to a screw or the like. In the present invention, when the lever has a portion that can be directly fixed to the shaft by mechanical fixing means, for example, a portion that can cover the surface of a part of the shaft, the lever such as the block 5 is engaged. Use of the joint member may be omitted.

  The lever device of the present invention is likely to be used for power transmission in a switching device such as a switch or a circuit breaker.

It is a front view of the three-phase alternating current switch including the whole lever apparatus of Embodiment 1. FIG. FIG. 2 is a plan view of a part of FIG. 1. FIG. 2 is an enlarged side view including a cross-sectional view of a portion viewed from a direction AA in FIG. 1. It is the other expanded side view including sectional drawing of the part seen from the direction of AA of FIG. It is XX sectional drawing in FIG. It is YY sectional drawing in FIG. FIG. 2 is a development view of the lever 2 shown in FIG. 1. FIG. 2 is a development view of the lever 3 shown in FIG. 1. It is a perspective view of the lever 3 obtained by processing from the unfolded state of FIG. 3 is a perspective view of a block 5. FIG. It is VV sectional drawing of FIG. FIG. 4 is a plan view of a part of FIG. 1 corresponding to FIG. 2 in the second embodiment. FIG. 6 is a development view of the lever 7 in the second embodiment.

Explanation of symbols

1: lever device, 2: lever, 21: main lever portion, 22: link connecting hole,
23: connecting part, 24: sub-lever part, 25: spring connecting hole, 3: lever, 31: lever part, 32: insulating rod connecting hole, 33: connecting part, 4: shaft, 41: shaft insertion hole,
42: body part, 43: through hole, 44: supported part, 5: block, 51: upper surface,
52: inner wall, 53: inner wall, 54: through hole, 6: spring pin, 7: lever,
81: Operation mechanism part, 82: Link, 83: Cart, 84: Spring, 85: Three-phase alternating current switching part,
86: Vacuum valve, 87: Fixed contact, 88: Movable contact, 89: Insulating rod.

Claims (8)

  A lever support device comprising a shaft support device for rotatably supporting a shaft, and a lever fixed to the shaft by a mechanical fixing means via an engagement member.   The lever is formed by bending a flat plate body into a U shape, and includes a pair of lever portions and a connecting portion that connects the pair of lever portions, and the engaging member includes the connecting portion and the above The lever device according to claim 1, wherein the lever device is engaged with a shaft.   The shaft is inserted into a shaft insertion hole provided in the lever, the mechanical fixing means is a spring pin, and the lever communicates the spring pin with the engagement member and each hole provided in the shaft. The lever device according to claim 1, wherein the lever device is fixed to the shaft by being inserted therethrough.   The lever device according to claim 3, wherein the engagement member and the shaft are in contact with each other in a state where the spring pin is inserted.   4. The contact length between the engaging member and the spring pin is greater than a distance between a lower surface of the shaft where the spring pin is inserted and a rigid body existing under the lower surface. Or the lever apparatus of Claim 4.   The lever device according to claim 5, wherein the rigid body is a carriage on which the lever device is mounted.   A lever device comprising: a support device for rotatably supporting a shaft; and a lever fixed to the shaft by mechanical fixing means.   The mechanical fixing means is a spring pin, and the lever is fixed to the shaft by inserting the spring pin in communication with each hole provided in the lever and the shaft. Item 8. The lever device according to Item 7.

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