Connection base and measuring device

Abstract

To easily and reliably connect a connection pedestal and a probe.SOLUTION: A connection pedestal 40 on which a probe 20 with a protrusion 23 is deployed, comprises a pedestal body 42 including an opening 43 through which a cylindrical part 21 passes when the probe 20 is inserted, and a notch 44 formed at an edge of a part of the opening 43 and through which the protrusion 23 passes. The pedestal body 42 includes a first stop part 45 provided at a part of the edge without any notch 44, of the opening 43, and with which the protrusion 23 comes into contact when the probe 20 is inserted and rotated, and a second stop part 48 provided to protrude from the pedestal body 42 radially inward from a locus of the protrusion 23 when the probe 20 is rotated, and having flexibility allowing the probe 20 to rotate by being pushed aside by the protrusion 23 coming into contact therewith when the probe 20 is rotated, where the protrusion 23 is stored and deployed in a space S between the first stop part 45 and the second stop part 48.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a connection pedestal and a measuring device provided with the connection pedestal.

Background Art

[0002] As a measuring device, for example, there is one shown in Non-Patent Document 1. The withstand voltage / insulation resistance tester of Non-Patent Document 1 includes a low voltage side test lead, a high voltage side test lead, a low voltage side output terminal, a high voltage side output terminal, and a cable lock provided on the front panel.

[0003] Hereinafter, the test operation (test procedure) in the withstand voltage / insulation resistance tester of Non-Patent Document 1 will be described. First, raise the cable lock of the low voltage side output terminal and connect the low voltage side test lead to the low voltage side output terminal. Next, lower the cable lock to prevent the low voltage side test lead from coming off the low voltage side output terminal. Subsequently, connect the low voltage side test lead to the object under test. After this, connect the high voltage side test lead to the object under test in the same manner.

[0004] After the test is completed, in reverse order to the above procedure, raise the cable lock and remove the test lead from the output terminal, and then lower the cable lock of the output terminal.

Prior Art Documents

Patent Documents

[0005]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The locking mechanism described in Non-Patent Document 1 required the user to connect and disconnect the probe on the lead to the terminal on the connection base, and to raise and lower the cable lock to prevent the probe from coming loose, which was cumbersome for the user.

[0007] This invention has been made in view of the above-mentioned problems, and aims to provide a simple and reliable connection between a connection base and a probe. [Means for solving the problem]

[0008] A connecting base according to one aspect of the present invention is a connecting base on which a probe having a cylindrical portion at one end and a projection projecting radially from the cylindrical portion is fastened, the base having an opening through which the cylindrical portion passes when the probe is inserted from one end in the columnar direction, and a base body formed on the edge of a part of the opening, through which the projection passes, the base body having a first stopper provided on a part of the edge of the opening where there is no notch, and which the projection abuts when the probe is rotated about the axis of the cylindrical portion after being inserted from one end in the columnar direction, and a second stopper provided protruding radially inward from the base body beyond the trajectory of the projection of the probe when the probe is rotated about the axis of the cylindrical portion, and which is flexible such that it is pushed aside by the projection that abuts the probe when the probe is rotated about the axis of the cylindrical portion, allowing the probe to rotate, the first stopper and the second stopper are arranged with a distance between them that accommodates the projection. [Effects of the Invention]

[0009] According to one aspect of the present invention, when the projection of the probe is aligned with the notch and the cylindrical portion of the probe is inserted from the opening in the direction of the column length, and the probe is rotated around the axis of the cylindrical portion, the projection is prevented from passing through the notch, and the cylindrical portion is prevented from coming out of the opening in the direction of the column length. Furthermore, as the probe rotates, the projection fits into the space between the first and second retaining portions, thereby securing the probe to the connecting base.

[0010] Therefore, according to this embodiment of the connection base, the connection base and the probe can be connected easily and reliably when the connection base and the probe are connected. [Brief explanation of the drawing]

[0011] [Figure 1] Figure 1 is a plan view illustrating the external appearance of the measuring device according to the first embodiment. [Figure 2] Figure 2 is a plan view illustrating the appearance of the probe applied to the measuring device. [Figure 3] Figure 3 is an enlarged view illustrating the connection part in the connection unit of the measuring device. [Figure 4] Figure 4 is a perspective view illustrating the state in which the probe is inserted into the connection unit of the measuring device. [Figure 5] Figure 5 is a plan view illustrating the state in which the probe is inserted into and fixed in the connecting base according to the first embodiment. [Figure 6] Figure 6 is a plan view illustrating the external appearance of the probe according to the second embodiment. [Figure 7] Figure 7 is a plan view illustrating a part of the connection unit according to the second embodiment. [Figure 8] Figure 8 is a plan view illustrating the connecting base according to the second embodiment. [Figure 9] Figure 9 is a plan view illustrating the state in which the probe is inserted into the connection base according to the second embodiment. [Figure 10] Figure 10 is a plan view illustrating the movement of the probe as it is rotated while inserted into the connecting base according to the second embodiment. [Figure 11] Figure 11 is a plan view illustrating the state in which the probe is placed on the connection base according to the second embodiment. [Figure 12] Figure 12 is a plan view illustrating a modified example of the connecting base. [Modes for carrying out the invention]

[0012] [First Embodiment] The measuring device 1 according to the first embodiment of the present invention will be described with reference to FIG. 1. FIG. 1 is a plan view for explaining the appearance of the measuring device 1. Further, FIG. 2 is a plan view for explaining the appearance of the probe 20 applied to the measuring device 1.

[0013] The measuring device 1 is a device for measuring the electrical characteristics of a device under test (not shown) or the like. In the present embodiment, the electrical characteristics are, for example, various electrical parameters such as voltage values, current values, and resistance values.

[0014] The measuring device 1 includes a housing 10 that covers the internal configuration of the device, and a front panel 11 that constitutes the front surface of the device. The front panel 11 is provided with a power switch 12, a monitor 13, an operation unit 14, and the like. Further, a connection portion 15 into which the probe 20 (see FIG. 2) is inserted is provided.

[0015] As shown in FIG. 2, the probe 20 includes a probe cylindrical portion 21 formed in a cylindrical shape on one end side. Further, the probe 20 includes a protrusion 23 that protrudes radially outward of the probe cylindrical portion 21. Further, the probe 20 includes a flange portion 22 that restricts the insertion of the probe cylindrical portion 21 in the column length direction into the connection pedestal 40 (see FIG. 4). In the present embodiment, the "column length direction" may be expressed as the "insertion and extraction direction".

[0016] The probe cylindrical portion 21 covers a connection terminal 24 connected to a circuit provided inside the measuring device 1 and a test lead 25 connected to the connection terminal 24.

[0017] The flange portion 22 is provided on the probe cylindrical portion 21 and has an enlarged diameter radially outward of the probe cylindrical portion 21. The flange portion 22 constitutes a restricting portion that restricts the probe cylindrical portion 21 from being inserted by a predetermined amount or more from the connection portion 15 (see FIG. 3).

[0018] The projection 23 is provided so as to protrude radially outward from the probe cylindrical portion 21, at a position closer to the insertion direction (direction B in Figure 2) than the flange portion 22 in the insertion and removal direction (directions A and B in Figure 2) of the probe 20 into the connection portion 15. In this embodiment, one projection 23 is provided on the probe cylindrical portion 21.

[0019] Furthermore, the projection 23 is located on the insertion side of the flange portion 22, at a distance corresponding to the thickness of the connecting base 40.

[0020] Figure 3 is an enlarged view illustrating the connection portion 15 in the connection unit 30, which is revealed when the front panel 11 of the measuring device 1 is removed. Figure 4 is a perspective view illustrating the state in which the probe 20 is inserted into the connection unit 30.

[0021] The connection unit 30 is located inside the front panel 11 and has the function of electrically connecting the connection terminal 24 of the probe 20 to the measuring device 1, and the function of physically connecting the probe 20 to the measuring device 1.

[0022] The connection unit 30 comprises a unit body 31. The unit body 31 is provided with a connection base 40 (see Figure 4) into which the probe 20 shown in Figure 2 can be inserted. This base has a circular opening 43 into which the cylindrical probe portion 21 of the probe 20 can be inserted from one end in the direction of the column length, and a notch 44 through which the projection 23 can pass. The opening 43 and the notch 44 are exposed to the outside of the measuring device 1 via the front panel 11 shown in Figure 1. In the connection unit 30, the portion exposed to the outside of the measuring device 1 constitutes the above-described connection portion 15.

[0023] As shown in Figure 4, the connection unit 30 includes a protective member 32 for protecting the inserted probe 20 and a connection base 40 for holding the probe 20, located inside the unit body 31 of the measuring device 1.

[0024] In this embodiment, "retained" includes a state in which the members are joined together with a degree of play that prevents them from coming apart.

[0025] In this embodiment, the probe 20 and the connection base 40 constitute a locking mechanism 100 for electrically and physically connecting the probe 20 and the measuring device 1.

[0026] The protective member 32 is equipped with a probe insertion portion 33 and supports the probe 20 inserted from the connection portion 15 so as not to shift in the direction intersecting the insertion and removal direction, and also protects the probe 20. The protective member 32 is attached to the unit body portion 31 by a protective member mounting portion 34 so as to cover the connection base 40.

[0027] The protective member 32 also has the function of protecting other circuits and other components inside the measuring device 1 from electromagnetic noise generated from the test leads 25 to which high voltage is applied.

[0028] The connecting base 40 is attached to the unit body 31 by the base mounting portion 41. Since the connecting base 40 is covered by the protective member 32, only a portion of the base mounting portion 41 is shown in Figure 4.

[0029] With the above configuration, the probe 20 inserted from the connection part 15 is secured to the measuring device 1 by the connection base 40 and supported by the probe insertion part 33 provided on the protective member 32.

[0030] Figure 5 is a plan view illustrating the state in which the probe 20 is inserted into and fixed in the connection base 40 according to this embodiment.

[0031] The connecting base 40 comprises a base body 42. Base mounting portions 41 for attaching to the unit body 31 are provided at both ends of the base body 42. The base body 42 has an opening 43 through which the probe cylindrical portion 21 passes when the probe 20 is inserted from one end in the column-length direction. In addition, a notch 44 is formed on a part of the edge of the opening 43 through which the projection 23 passes. The opening 43 is an opening for the insertion of the probe cylindrical portion 21 and is formed in a circular shape corresponding to the probe cylindrical portion 21.

[0032] The notch 44 is formed by expanding radially outward from the edge of the opening 43 and is rectangular in shape, through which the projection 23 provided on the probe 20 can pass. After the projection 23 passes through the notch 44, the opening 43 prevents the projection 23 from passing through when the probe 20 is rotated around the axis of the probe cylindrical portion 21.

[0033] This prevents the probe 20 from coming off the connection base 40 by allowing it to rotate. Therefore, it is possible to avoid a situation where the probe 20 comes off and the measuring device 1 and the probe 20 become disconnected.

[0034] The connecting base 40 has a first fastening portion 45 and a second fastening portion 48.

[0035] The first stopper portion 45 is provided on a part of the edge of the opening 43 where there is no notch portion 44, and when the probe cylindrical portion 21 is inserted from one end in the direction of the column length and then rotated around the axis of the probe cylindrical portion 21, the protrusion 23 comes into contact with it. The first stopper portion 45 is provided in the circumferential direction of the opening 43 at a position rotated by a predetermined angle from the notch portion 44. In this embodiment, it is provided at a position rotated by 90 degrees.

[0036] This allows the probe 20 to rotate in one direction from the position where the projection 23 corresponds to the notch 44 to the position where the projection 23 contacts the first stopper 45.

[0037] The second fastening portion 48 is connected to the base portion 47 fixed to the base body portion 42 by an arm portion 46 having a shape along the opening 43. The arm portion 46 is flexible and has a predetermined elastic force.

[0038] The second retaining portion 48 is provided protruding radially inward from the base body portion 42, relative to the trajectory (arc-shaped) of the projection 23 of the probe 20 when the probe 20 is rotated around the axis of the probe cylindrical portion 21. The second retaining portion 48 is also flexible enough to be pushed aside by the projection 23 that it contacts when the probe 20 is rotated around the axis of the probe cylindrical portion 21, allowing the probe 20 to rotate. The second retaining portion 48 is movable radially in the direction of the opening 43 relative to the base body portion 42 and the base portion 47 by the gap E formed in the base body portion 42.

[0039] The first fastening portion 45 and the second fastening portion 48 are provided in the connecting base 40 such that there is a gap S between them that accommodates the protrusion 23.

[0040] In this embodiment, the connecting base 40 can be integrally molded by molding a general-purpose engineering plastic. For example, the gap E can be formed by fitting a metal piece into the mold to form the gap E, and then removing the metal piece after molding. This makes it possible to form a base portion 47 integrated with the base body portion 42, and a second stopper portion 48 that is connected to the base portion 47 by the arm portion 46 and is movable relative to the base portion 47 in the gap E.

[0041] Next, the effects of the connecting base 40 in the locking mechanism 100 according to this embodiment will be explained.

[0042] In this embodiment, a probe 20 is secured to the connecting base 40, which has a cylindrical probe portion 21 at one end and a projection 23 that protrudes radially from the probe cylindrical portion 21. The connecting base 40 has an opening 43 into which the probe cylindrical portion 21 is inserted from one end of the probe 20 in the direction of the column length, and a base body portion 42 with a notch 44 through which the projection 23 passes. The opening 43 prevents the projection 23 from passing when the probe 20 is rotated around the axis of the probe cylindrical portion 21.

[0043] The base body 42 is provided on a part of the edge of the opening 43 where there is no notch 44, and includes a first stopper 45 against which the projection 23 abuts when the probe 20 is rotated around the axis of the probe cylindrical part 21, and a second stopper 48 which is flexible and protrudes radially inward from the trajectory of the projection 23 of the probe 20 when the probe 20 is rotated around the axis of the probe cylindrical part 21. The first stopper 45 and the second stopper 48 are arranged with a gap that accommodates the projection 23.

[0044] According to the connecting base 40 of this embodiment, when the projection 23 of the probe 20 is aligned with the notch 44 and the probe cylindrical portion 21 is inserted into the opening 43 in the longitudinal direction of the probe 20, and then rotated around the axis of the probe cylindrical portion 21, the projection 23 of the probe 20 is positioned within the gap S between the first stopper 45 and the second stopper 48.

[0045] As a result, rotation of the probe 20 in one direction (direction of arrow R) is restricted by the first stopper 45, and rotation in the other direction (opposite direction of arrow R) is restricted by the second stopper 48. Therefore, according to the connection base 40 in this embodiment, when the connection base 40 and the probe 20 are connected, unwanted rotation of the probe 20 can be suppressed.

[0046] Furthermore, after the probe cylindrical portion 21 is inserted into the opening 43 in the longitudinal direction of the probe 20, when the probe cylindrical portion 21 is rotated around its axis, the protrusion 23 of the probe 20 is prevented from passing through the opening 43, thus preventing the probe cylindrical portion 21 from being pulled out in the insertion / removal direction.

[0047] Furthermore, the second stopper portion 48 is connected to the base portion 47 and the arm portion 46, and is movable in the radial direction of the opening 43.

[0048] Therefore, after the probe cylindrical portion 21 is inserted into the opening 43 until the flange portion 22 of the probe 20 abuts against the connection portion 15, when the probe cylindrical portion 21 is rotated in one direction (direction of arrow R in Figure 5), the projection 23 of the probe 20 abuts against the second retaining portion 48. As the probe cylindrical portion 21 rotates further, the arm portion 46 bends, and the projection 23 of the probe 20 slides along the surface of the second retaining portion 48, pushing the second retaining portion 48 radially outward (direction of arrow C in Figure 5). As a result, the projection 23 of the probe 20 overcomes the second retaining portion 48.

[0049] When the projection 23 of the probe 20 comes into contact with the first stopper 45, the arm portion 46 returns to its original position, causing the second stopper 48 to return to the position it was in before the projection 23 made contact. As a result, the projection 23 of the probe 20 can fit into the gap S between the first stopper 45 and the second stopper 48, and is held in place by the first stopper 45 and the second stopper 48.

[0050] Therefore, with the connection base 40, in a probe 20 in which the connection terminal 24 is covered by the probe cylindrical portion 21 and not exposed on the front side, the probe 20 is secured to the connection base 40 simply by inserting the probe cylindrical portion 21 into the opening 43 and rotating the probe cylindrical portion 21 in one direction. Thus, the connection base 40 and the probe 20 can be connected easily and reliably.

[0051] In this state, rotation of the probe cylindrical portion 21 in one direction is restricted by the first stopper portion 45. Furthermore, rotation in the opposite direction requires a biasing force sufficient to bend the arm portion 46 so that the projection portion 23 can overcome the second stopper portion 48.

[0052] As a result, the connection base 40 prevents unnecessary rotation of the probe 20 relative to the connection base 40. Therefore, the connection base 40 and the probe 20 can be reliably connected.

[0053] Furthermore, the strength of the arm portion 46 and the biasing force required when the second fastening portion 48 flexes can be achieved by adjusting the type of engineering plastic and the dimensions of each part of the arm portion 46.

[0054] Furthermore, when the probe 20 is inserted into the connection part 15 and the flange part 22 comes into contact with the connection part 15, and the probe cylindrical part 21 is rotated until the projection 23 of the probe 20 comes into contact with the first stopper part 45, the connection base 40 fits into the space between the projection 23 of the probe 20 and the flange part 22. This also suppresses unnecessary movement of the probe 20 in the insertion and removal direction.

[0055] Therefore, the connection base 40 makes it easy to connect the probe 20 to the connection base 40 while preventing the probe 20 from easily coming loose from the connection base 40.

[0056] [Second Embodiment] Next, the connection base 40A and the locking mechanism 200 provided by the connection base 40A according to the second embodiment will be described with reference to Figures 6 to 11. The locking mechanism 200 can be applied to the connection between the measuring device 1 and the probe 20 as described in the first embodiment.

[0057] In the second embodiment, the shape of the probe 20 and the shape of the connecting base 40 corresponding to the probe 20 differ from those of the first embodiment. Configurations having the same function as in the first embodiment are given the same numbers and detailed descriptions are omitted.

[0058] Figure 6 is a plan view illustrating the appearance of the probe 20A applied to the second embodiment. Figure 7 is a plan view illustrating the connection unit 30A applied to the second embodiment.

[0059] As shown in Figure 6, the probe 20A comprises a probe cylindrical portion 21, a flange portion 22, and a pair of projections 223a and 223b. The pair of projections 223a and 223b are provided on the surface of the probe cylindrical portion 21 at symmetrical positions.

[0060] Furthermore, the protrusions 223a and 223b are located on the insertion side (direction of arrow B in Figure 6) of the flange portion 22, at a distance corresponding to the thickness of the connecting base 40A (see Figure 8).

[0061] As shown in Figure 7, the connection unit 30A has an opening 43 into which the probe cylindrical portion 21 shown in Figure 6 can be inserted. In addition, a notch 244a through which the projection 223a can pass and a notch 244b through which the projection 223b can pass are formed at symmetrical positions.

[0062] Figure 8 is a plan view illustrating the connection base 40A. Figure 9 is a plan view illustrating the state in which the probe 20A is inserted into the connection base 40A.

[0063] The connecting base 40A comprises a base body 42. Both ends of the base body 42 are provided with base mounting portions 41 for attachment to the unit body 31. The connecting base 40A has a pair of notches 244a and 244b formed symmetrically in the opening 43.

[0064] Each of the pair of notches 244a and 244b is formed by expanding radially outward from the edge at a symmetrical position in the opening 43, and is formed in a rectangular shape corresponding to the protrusions 223a and 223b provided on the probe 20A.

[0065] As shown in Figure 8, the connecting base 40A is provided with protruding guide portions 245a and 245b at positions symmetrical with respect to the opening center of the opening 43. It is also provided with first stopping portions 246a and 246b at positions symmetrical with respect to the opening center of the opening 43. Furthermore, it is provided with arm portions 247a and 247b at positions symmetrical with respect to the opening center of the opening 43.

[0066] The projection guide portion 245a is part of the edge of the notch portion 244a and is positioned to restrict the rotation of the probe cylindrical portion 21 in a direction opposite to one direction. The projection guide portion 245a protrudes in the insertion / removal direction beyond the thickness of the base body portion 42 and has the function of guiding the projection portion 223a in the insertion / removal direction.

[0067] The projection guide portion 245b is part of the edge of the notch portion 244b and is positioned to restrict the rotation of the probe cylindrical portion 21 in a direction opposite to one direction. The projection guide portion 245b protrudes in the insertion / removal direction beyond the thickness of the base body portion 42 and has the function of guiding the projection portion 223b in the insertion / removal direction.

[0068] The first stopper portion 246a is located in the opening 43, on a part of the edge where the notches 244a and 244b are not formed, and is positioned to restrict rotation in one direction. In this embodiment, the first stopper portion 246a is located in the circumferential direction of the opening 43, rotated 90 degrees from the projection guide portion 245a.

[0069] The first stopper portion 246b is located in the opening 43, on a part of the edge where the notches 244a and 244b are not formed, and is positioned to restrict rotation in one direction. In this embodiment, the first stopper portion 246b is located in the circumferential direction of the opening 43, rotated 90 degrees from the projection guide portion 245b.

[0070] The second fastening portion 249a is connected to the base portion 248a fixed to the base body portion 42 by an arm portion 247a which has a shape along the opening 43. The arm portion 247a is flexible and has a predetermined elastic force.

[0071] The second stopper portion 249a is provided so as to protrude radially inward from the trajectory (arc-shaped) of the projection portion 223a when the probe cylindrical portion 21 of the probe 20A is rotated about the axis of the probe cylindrical portion 21. The second stopper portion 249a is movable radially in the opening 43 relative to the base body portion 42 and the base portion 248a by the gap E formed in the base body portion 42.

[0072] The arm portion 247b, like the arm portion 247a, connects the base portion 248b and the second fastening portion 249b.

[0073] The first fastening portion 246a and the second fastening portion 249a are provided in the connecting base 40A with a spacing S1 that accommodates the protrusion 223a. The first fastening portion 246b and the second fastening portion 249b are provided in the connecting base 40A with a spacing S2 that accommodates the protrusion 223b (see Figure 11).

[0074] Furthermore, the connecting base 40A is provided with reinforcing ribs 261 and 262 to reinforce the protruding guide portion 245a. In addition, a reinforcing rib 263 is provided to reinforce the first fastening portion 246b.

[0075] Similarly, the connecting base 40A is provided with reinforcing ribs 264 and 265 to reinforce the protruding guide portion 245b. In addition, a reinforcing rib 266 is provided to reinforce the first fastening portion 246b.

[0076] Furthermore, the connection base 40A is provided with probe guide sections 271 and 272 to guide the probe cylindrical section 21 along the edge of the opening 43. The probe guide sections 271 and 272 guide the probe 20A so that it can move only in the insertion and removal direction. This makes it easier to insert and remove the probe 20A from the connection base 40A.

[0077] In this embodiment, the projection guide portion 245a, reinforcing rib 261, reinforcing rib 262, probe guide portion 271, first stopper portion 246b, and reinforcing rib 263 are integrally formed. Furthermore, the projection guide portion 245b, reinforcing rib 264, reinforcing rib 265, probe guide portion 272, first stopper portion 246a, and reinforcing rib 266 are integrally formed.

[0078] In this embodiment, each part constituting the connecting base 40A is integrally molded by molding using general-purpose engineering plastic.

[0079] Next, the effects of the connecting base 40A in the locking mechanism 200 according to this embodiment will be explained with reference to Figures 10 and 11.

[0080] Figure 10 is a plan view illustrating the movement of the probe 20A as it is rotated after being inserted into the connection base 40A. Figure 11 is a plan view illustrating the state in which the probe 20A is fixed in place on the connection base 40A.

[0081] As the connection base 40A has the configuration described with reference to Figure 8, the probe 20A is allowed to rotate in one direction from a state in which the projection 223a of the probe 20A corresponds to the notch 244a and the projection 223b of the probe 20A corresponds to the notch 244b, as shown in Figure 9, until the projection 223a of the probe 20A abuts against the first stopper 246a and the projection 223b abuts against the first stopper 246b.

[0082] After the probe cylindrical portion 21 is inserted into the opening 43 until the flange portion 22 of the probe 20A contacts the connection portion 15, the probe cylindrical portion 21 is rotated in one direction (direction of arrow R in Figure 10), causing the projection 223a of the probe 20A to contact the second retaining portion 249a. As the probe cylindrical portion 21 rotates further, the arm portion 247a bends, causing the projection 223a of the probe 20A to slide along the surface of the second retaining portion 249a and push the second retaining portion 249a radially outward (direction of arrow D1 in Figure 10). As a result, the projection 223a of the probe 20A overcomes the second retaining portion 249a.

[0083] At the same time, in the case of the arm portion 247b, the arm portion 247b also bends, and the projection 223b of the probe 20A slides along the surface of the second stop portion 249b, pushing the second stop portion 249b radially outward, causing the projection 223b of the probe 20A to move over the second stop portion 249b.

[0084] As shown in Figure 11, when the projection 223a of the probe 20A contacts the first stopper 246a, the arm portion 247a returns to its original position, causing the second stopper 249a to return to the position it was in before the projection 223a of the probe 20A contacted it (in the direction of arrow D2 in Figure 11). Also, when the probe 20A is rotated until the projection 223a contacts the first stopper 246a, the projection 223b of the probe 20A contacts the first stopper 246b. At this time, the arm portion 247b returns to its original position, causing the second stopper 249b to return to the position it was in before the projection 223b of the probe 20A contacted it.

[0085] As a result, the projection 223a of the probe 20A fits into the gap S1 between the first stopper 246a and the second stopper 249a, and the projection 223b of the probe 20A fits into the gap S2 between the first stopper 246b and the second stopper 249b, so that the probe 20A is secured to the connection base 40A.

[0086] In the state shown in Figure 11, the rotation of the probe cylindrical portion 21 of the probe 20A in one direction is restricted by the first stoppers 246a and 246b. Furthermore, in order to rotate in the opposite direction, a biasing force is required that is sufficient to bend the arm portions 247a and 247b so that the projections 223a and 223b overcome the second stoppers 249a and 249b.

[0087] Therefore, according to the second embodiment, unnecessary rotation of the probe 20A relative to the connection base 40A provided on the measuring device 1 can be suppressed.

[0088] In the state shown in Figure 11, the connecting base 40A is positioned in the space between the protrusions 223a and 223b of the probe 20A and the flange portion 22. This also suppresses unnecessary movement of the probe 20A when inserting or removing it.

[0089] In the locking mechanism 200, the strength of the protruding guide portions 245a, 245b, the first stopping portions 246a, 246b, and the probe guide portions 271, 271 is increased by the provision of reinforcing ribs 261 to 266.

[0090] Furthermore, the protruding guide portion 245a, reinforcing rib 261, reinforcing rib 262, probe guide portion 271, first stopper portion 246b, and reinforcing rib 263 are integrally formed. Also, the protruding guide portion 245b, reinforcing rib 264, reinforcing rib 265, probe guide portion 272, first stopper portion 246a, and reinforcing rib 266 are integrally formed. As a result, the strength of each part of the connecting base 40A is further enhanced.

[0091] Furthermore, in the second embodiment, since each of the protruding guide portions 245a, 245b, the first stopping portions 246a, 246b, and the arm portions 247a, 247b is provided in pairs, even if one of the members is damaged, the function of securing the probe 20A and the connecting base 40A will not be impaired.

[0092] Furthermore, by positioning the protruding guide portions 245a, 245b, the first stopping portions 246a, 246b, and the arm portions 247a, 247b symmetrically, the connecting base 40A loses its orientation as a product when viewed from above. This prevents confusion among workers during the manufacturing process and improves assembly efficiency.

[0093] In the explanation using Figures 8 to 11, for the sake of clarity, it was explained that the probe 20A is inserted into the connecting base 40A by aligning the projection 223a of the probe 20A with the notch 244a and the projection 223b of the probe 20A with the notch 244b. However, since the projections 223a and 223b of the probe 20A are located symmetrically on the cylindrical part 21 of the probe, they are not distinguishable. The probe 20A may also be inserted into the connecting base 40A by aligning the projection 223a of the probe 20A with the notch 244b and the projection 223b of the probe 20A with the notch 244a.

[0094] [Other embodiments] Although this embodiment has been described above, the above embodiment only illustrates a part of the application of the present invention, and it is not intended to limit the technical scope of the present invention to the specific configuration of the above embodiment.

[0095] In this embodiment, the flange portion 22 that protrudes radially outward around the entire circumference of the probe cylindrical portion 21 constitutes the restricting portion. The restricting portion does not have to be the flange portion 22; it can be any object that restricts the probe cylindrical portion 21 from being inserted beyond a predetermined amount from the connection portion 15. For example, it may be a protrusion formed by a part of the probe cylindrical portion 21 protruding radially outward. Alternatively, it may be a hollow cone-shaped member whose opening diameter expands as it progresses in the insertion direction.

[0096] In this embodiment, if the distance S between the first stopper 45 and the second stopper 48 is set to a distance at which the first stopper 45 and the second stopper 48 are in close contact with the projection 23 when the device is in place, the second stopper 48 will always be subjected to a pressing load when the device is in place. In this case, the load will accumulate on the arm portion 46, which will lead to a decrease in the durability of the arm portion 46. For this reason, there may be a gap between the first stopper 45, the second stopper 48 and the projection 23, as long as it is within a range that can suppress unnecessary rotation of the probe 20.

[0097] In this embodiment, the first stopper portion 45 is positioned 90 degrees rotated from the notch portion 44 in the circumferential direction of the opening 43. However, it is not limited to 90 degrees. Similarly, the relationship between the first stopper portions 246a, 246b and the protruding guide portions 245a, 245b is not limited to 90 degrees.

[0098] Figure 12 is a plan view illustrating a modified example of the connecting base 40.

[0099] The connecting base 40B shown in Figure 12 comprises a pair of projection guide sections 345a and 345b, a pair of stopper sections 346a and 346b, and a pair of probe guide sections 371 and 372. Unlike the connecting base 40A, the projection guide section 345a, the probe guide section 371, and the stopper section 346b of the connecting base 40B are constructed as separate components. Furthermore, the projection guide section 345b, the probe guide section 372, and the stopper section 346a are also constructed as separate components.

[0100] Furthermore, the reinforcing ribs 261 and 262 provided on the connecting base 40A to reinforce the protruding guide portion 245a, and the reinforcing rib 263 provided on the first fastening portion 246b, do not need to be provided on the connecting base 40B. Similarly, the connecting base 40B does not need to be provided with reinforcing ribs 264, 265, and 266.

[0101] Furthermore, the positions of the reinforcing ribs 261, 262, 263, 264, 265, and 266 are not limited to those shown in Figures 8 to 12.

[0102] In contrast to the connecting base 40B shown in Figure 12, the connecting base 40 shown in Figure 5 may be provided with reinforcing ribs to reinforce the first fastening portion 45. Furthermore, the connecting base 40 shown in Figure 5 may be provided with a probe guide portion to guide the probe cylindrical portion 21. In this case, the first fastening portion 45, the reinforcing ribs, and the probe guide portion can be integrally molded with the base body portion 42.

[0103] In Figure 5, the positions of the notch 44, the first stopper 45, and the arm 46 in the opening 43 are not limited to those shown, as long as their respective functions are not impaired. Furthermore, the rotational direction for securing the probe 20 may be opposite to the direction shown in Figure 5. For example, each component of the connecting base 40 may be configured in a mirror-image symmetrical relationship with that in Figure 5. The same applies to Figures 8 and 12.

[0104] The connecting base may have two or more notches. In this case, the connecting base is provided with stoppers at positions corresponding to the multiple notches. Accordingly, the probe is provided with a number of protrusions corresponding to the number of notches at positions corresponding to the notches. [Explanation of symbols]

[0105] 1. Measuring device 10 Housing 11 Front Panel 12 Power switch 13 monitors 14 Control section 15 Connection part 20,20A probe 21 Probe cylindrical section 22 Flange section 23. Protrusion 24 connection terminals 25 Test Leads 30 connection units 31 Unit main body 32 Protective components 33 Probe insertion section 34 Protective member mounting section 40, 40A, 40B connection base 41 Base mounting section 42 Base body 43 Opening 44 Notch 45 First stopping part 46 Arm section 47 Base 48 Second fastening part 100,200 Locking mechanism 223a,223b Projection 244a, 244b Notches 245a, 245b Protruding guide section 246a, 246b First stopping part 247a, 247b Arm section 248a,248b base 249a, 249b Second fastening part 261, 262, 263, 264, 265, 266 Reinforcement ribs 271,272 Probe guide section 345a, 345b Protruding guide section 346a, 346b First stopping part 371,372 Probe guide section S,S1,S2 interval E void

Claims

1. A connecting base on which a probe having a cylindrical portion at one end and a projection that protrudes radially from the cylindrical portion is attached, The base body has an opening through which the cylindrical portion passes when the probe is inserted from one end in the longitudinal direction of the column, and a notch formed on a part of the edge of the opening through which the projection passes. The aforementioned base body is, A first stopper is provided in the opening on a part of the edge where the notch is absent, and the projection abuts against the probe when it is rotated around the axis of the cylindrical part after being inserted from one end in the direction of the column length, The base body is provided with a second stopper portion that protrudes radially inward from the trajectory of the projection of the probe when the probe is rotated around the axis of the cylindrical portion, and is flexible enough to be pushed aside by the projection that it contacts when the probe is rotated around the axis of the cylindrical portion, thereby allowing the probe to rotate. The first stopper and the second stopper are arranged with a distance between them such that the protrusion fits inside. Connection base.

2. A connecting base according to claim 1, The base portion has a base portion that fixes the second fastening portion to the base body portion, The second retaining portion is movable relative to the base portion in the radial direction of the opening. Connection base.

3. A connecting base according to claim 2, The base portion is integrally molded with the base body portion. Connection base.

4. A connecting base according to claim 1, The base body has a pair of notches formed at symmetrical positions in the opening, and a pair of second fastening portions provided at symmetrical positions. Connection base.

5. A connecting base according to claim 1, The aforementioned base body is, The opening is provided with a probe guide portion that guides the probe in the insertion and removal direction. Connection base.

6. A connecting base according to claim 5, In the base body, the pair of probe guides are provided in symmetrical positions. Connection base.

7. A connecting base according to claim 6, One of the probe guide portions and the other of the first stopper portions are integrally formed. Connection base.

8. A connecting base according to claim 5, The first stopper, the probe guide, and the second stopper are integrally molded with the base body. Connection base.

9. A connecting base according to any one of claims 1 to 8, Measuring device.

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