JPH082616Y2 - Measuring probe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a measuring probe, and more particularly to a measuring probe used in an electrical measuring instrument such as a four-terminal resistance meter.

[Conventional technology]

Some measuring probes used in electrical measuring instruments such as a four-terminal ohmmeter have a structure as shown in FIGS. 10 to 13, for example. This measuring probe comprises a pair of metal fittings (1) (1) formed by bending a metal strip member into a predetermined shape.
And a non-conductive shaft core member (2) made of plastic or the like having a substantially columnar shape, and a cylindrical elastic rubber member (3). The metal fitting (1) includes a clip portion (1a) having a groove (4) formed in a facing surface of a tip portion thereof, a shaft support portion (1b) at a central portion, and a grip portion (1c) at a rear end portion. Composed of. The shaft core member (2) is formed by integrally forming flange portions (2b) and (2b) on both sides of the columnar portion (2a).
The shaft support member (1) is fitted into the groove between the flange portions (2b) and (2b) of the shaft core member (2) so that the shaft core member (2) is mounted on the bracket. (1) Gripping with (1), in this state, the elastic rubber member (3) is externally fitted to the tip side part between the clip parts (1a) and (1a) of the metal fittings (1) and (1), and its elasticity The force exerts a biting force between the clip portions (1a) (1a) by the force. In addition, the lead wires (5) and (5) are soldered to the shaft core member (2) by soldering the core wire portion at the tip thereof to the elastic rubber member (3) of the metal fittings (1) and (1). After being inserted into the through holes (6) and (6), they are bundled into one cord (7) and led out to the rear. The grips (1c) (1c) of the metal fittings (1) (1) are covered with insulating tape members (8) (8).

When using this measurement probe, as shown in FIG. 13, the grips (1c) (1c) of the metal fittings (1) (1) are pressed in to resist the elastic force of the elastic rubber member (3). The clip member (1a) (1a) is expanded with the shaft core member (2) as a fulcrum, and the pressing force applied to the gripping portions (1c) (1c) is released so that the object to be measured such as a measuring terminal having a circular cross section ( Hold a) with the clip parts (1a) and (1a).

Further, there are various measuring probes other than the above structure, such as Japanese Utility Model Laid-Open No. 63-170773 and Japanese Utility Model Laid-Open No. 63-
There is a structure disclosed in Japanese Patent No. 170774.

[Problems to be solved by the device]

By the way, in the above-mentioned conventional measuring probe, the fulcrum of the clip parts (1a) and (1a) is present in front of the grips (1c) and (1c), and the clip part (1a) is provided immediately in front of this fulcrum.
The point of action of (1a) is arranged. If the distance between the fulcrum and the point of action is short, the clip portion (1a) (1a) should be clamped by the clip portion (1a) (1a) such that the object to be measured (a) such as a measuring terminal having a circular cross section is pinched. 1a) The expansion angle of (1a) must be increased. This way the clip part (1a)
When the spread angle of (1a) becomes large, the object to be measured (a)
The force that pushes out the front part is large, and this often causes the object to be measured (a) to be pulled out from between the clip parts (1a) and (1a), thus ensuring a reliable and stable electrical connection. It was difficult.

Therefore, the present invention has been proposed in view of the above problems, and an object thereof is to provide a measurement probe that can reliably hold the object to be measured held by the clip portion in a stable state. is there.

[Means for solving the problem]

The technical means for achieving the above object in the present invention is a clip portion having a terminal metal fitting attached to the tip, and a thin neck portion bent and extended from the clip portion and having a recess formed on one side surface. Via a pair of casings of the same shape integrally formed with a long grip portion extending rearward from the clip portion and a shaft support portion provided at the rear end of the grip portion. The neck of the other casing is fitted into the recess of the neck so that the casings of the other side intersect with each other at the neck, and the gripping force is applied between the clip parts by the elastic force of the spring interposed between the grips near the neck. That is, the shaft support portions of the opposite casings are pivotally attached to each other in a biased state.

[Action]

In the measuring probe according to the present invention, since the shaft supporting portion is arranged at the rear end of the grip portion extending rearward from the clip portion, the shaft supporting portion is present at a position apart from the clip portion.
When the clip portion is expanded by pressing the grip portion around the shaft support portion as a fulcrum, the expansion angle of the terminal fitting of the clip portion is small and a movement similar to a substantially parallel movement of the terminal fitting is obtained. As a result, when the object to be measured is held by the terminal fitting, the force acting to push the object to be measured forward is reduced, and the holding of the object to be measured by the terminal fitting is reliably stabilized.

〔Example〕

An embodiment of the measuring probe according to the present invention will be described with reference to FIGS. 1 to 9.

As shown in FIGS. 1 and 2, the measuring probe of the present invention has a clip portion (11a), a long grip portion (11b) extending rearward from the clip portion (11a), and a grip portion (11b). 1
1b) A pair of casings (11) of the same shape integrally formed with a shaft support (11c) provided at the rear end. Since the casings (11) have completely the same shape, they can be manufactured by resin molding with the same mold to reduce the cost.

Hereinafter, the structure of one casing (11) will be specifically described with reference to FIGS. 1, 2 and 3 to 6.

First, at the tip of the clip part (11a), make a groove (1
2) Engraved conductive terminal metal fitting (13) is screw (14)
It is mounted and fixed by. In addition, the clip portion (11a) is provided on one side wall with the clip portion (11) of the other casing (11).
A guide piece (15) extending in a direction opposite to a) is integrally projected. A grip portion (11b) described later is formed via a neck portion (11d) extending from the clip portion (11a) by bending at about 90 °. The neck portion (11d) is a thin-walled portion having a thickness about half that of the clip portion (11a) and the grip portion (11b), and is the side where the guide piece (15) of the clip portion (11a) is present. A recess (16) into which the neck portion (11d) of the other casing (11) is fitted is formed on one side surface. In addition, inside the neck portion (11d), a lead wire routing space that communicates with a terminal metal fitting mounting portion (17) of the clip portion (11a) and a lead wire housing portion (described later) of the grip portion (11b) ( 1
8) is provided.

Next, the gripping portion (11b) extending rearward from the clip portion (11a) through the neck portion (11d) is connected to the other casing (1
It has a U-shaped cross section in which a recess (19) is formed on the side facing the gripping part (11b) of 1). The recess (19) has a plurality of rod-shaped projections (20) (2) along the longitudinal direction of the grip (11b).
0) are provided, and the positions of the lead wires (22) arranged in the lead wire housing portion (21) are regulated by the protrusions (20) (20). A cylindrical projecting wall (23) is provided in the vicinity of the neck of the recess (19) of the gripping part (11b), and a partially notched cylindrical projecting wall (23) is provided in the projecting wall (23) between the clip parts as described later. A spring (24) for urging the biting force is stored and arranged. A protruding strip (25) is provided on the outer peripheral surface of the gripping portion (11b) corresponding to the portion where the protruding wall (23) is formed, which indicates the portion to be pressed. In addition, at the rear end of the shaft support (11c) at the rear end of the grip (11b), the lead wire (22) led out from each grip (11b) (11b) of the pair of casings (11) (11). The protrusion (2) that holds down the cord (26) that bundles the (22)
7) is provided, and an opening (28) for leading out the above cord (26) from the gripping part (11b) is formed behind it.

Finally, the shaft support portion (11c) provided at the rear end of the grip portion (11b) has two arcuate projections (31a) (31a) (31a) (31a) formed through the shaft hole (30) into which the shaft core (29) is inserted. 31b),
One protrusion (31a) arranged on the outside (hereinafter referred to as an outer protrusion) is thick, and the other protrusion (31b) arranged on the inside is thick.
The inner protrusion (31b) of the shaft support (11c) of the other casing (11) is fitted between the outer protrusion (31a) and the inner protrusion (31b). There is a gap. The outer protrusion (31a) is formed so as to slightly project from the side surface of the grip portion (11b), and on the side surface opposite to the surface on which the outer protrusion (31a) is formed, the shaft support portion of the other casing (11) ( A concave groove (32) into which the outer protrusion (31a) of 11c) is fitted is formed.

The measuring probe of the present invention is assembled by preparing two casings (11) having the structure described above. The lead wire (22) drawn from the terminal fitting (13) of the clip part (11a) has its core wire connected and fixed to the terminal fitting (13) with a screw (33). It is inserted from the lead wire (17) into the lead wire drawing space (18) of the neck portion (11d) and is drawn out to the gripping portion (11b), and the projection (20) () is formed in the lead wire housing portion (21) of the recess (19). 20)… The position is regulated and distributed. The two lead wires (22) pulled out from the gripping part (11b) of each casing (11) are bundled behind the shaft support (11c), and the bundled cords (26) are held by the protrusions (27). It is inserted, its position is regulated, and it is led out from the opening (28) of the grip (11b). The two casings (11) and (11) thus obtained are used to assemble in the following procedure. That is, as shown in FIG. 7, the positional relationship is such that the recesses (19) and (19) of the grips (11b) and (11b) face each other. Then, springs (24) are provided in the projecting walls (23) (23) near the necks of the grips (11b) (11b).
The two casings (11) and (11) are arranged in an X-shape as shown in FIG. That is, with the grips (11b) (11b) expanded, the neck (11d) of the other casing (11) is fitted into the recess (16) of the neck (11d) of the one casing (11). Then, the casings (11) (11) of the other side are crossed at the neck portions (11d) (11d). From this state, the guide pieces (15) of one clip portion (11a) are moved along the side surfaces of the other clip portion (11a) while the rear end portions of the grip portions (11b) (11b) are brought close to each other. The clips (11a) and (11a) are arranged so as to face each other. The grips (11b) (11b) are arranged substantially parallel to each other, and at the shaft support (11c) (11c) at the rear end, one outer protrusion (31a) fits into the other groove (32), and The other inner protrusion (31b) is fitted in the gap between the one outer protrusion (31a) and the inner protrusion (31b), and the shaft holes (30) (30) are concentrically arranged. By inserting the shaft core (29) into the shaft holes (30) (30), the opposite casings (11) (11) are pivotally mounted at the shaft support parts (11c) (11c).

When using the measurement probe assembled as described above, first, as shown in FIG. 9, the protrusions (25) of the grips (11b) (11b) of the casings (11) (11) are firstly used.
By pressing the part where (25) ... Is formed against the elastic force of the spring (24), the terminal parts (13) of the clip parts (11a) (11a) are set with the shaft support parts (11c) (11c) as fulcrums.
Expand (13). And this terminal metal fitting (13) (1
3) Place an object to be measured (b) such as a measuring terminal with a circular cross section between them, and release the pressing force on the grips (11b) (11b), and the elastic force of the spring (24) will cause the object to be measured. The object (b) is held by the terminal fittings (13) (13). This time,
Since the shaft support parts (11c) (11c) are arranged at the rear ends of the long gripping parts (11b) (11b) extending rearward from the clip parts (11a) (11a), the clip parts (11a) ( Since the distance between the point of action of the terminal metal fittings (13) and (13) on the object (b) to be measured and the fulcrum of the shaft support parts (11c) and (11c) is set to be long, 13) The expansion angle of (13) is small,
The terminal fittings (13) (13) can be moved in a manner similar to a substantially parallel movement during the expansion. Therefore, when the object to be measured (b) having a circular cross section is held by the terminal fittings (13) and (13), the force acting to push the object to be measured (b) forward becomes small. The DUT (b) is the terminal fitting (1
3) There will be no removal from (13).

[Effect of device]

According to the measuring probe of the present invention, since the shaft supporting portion serving as the fulcrum is arranged at the rear end of the long gripping portion extending rearward from the clip portion serving as the working point, the distance between the working point and the fulcrum is reduced. Since it can be set long, the expansion angle of the terminal fitting of the clip part can be made small, and it becomes possible to expand the terminal fitting in a movement that approximates the parallel movement, and the measured object can be expanded with the terminal fitting. When the object is held, the force acting to push the object to be measured forward is reduced, and the object to be clamped by the terminal metal fitting is reliably stabilized, and mistakes in mounting the terminal material are minimized to improve workability. It is greatly improved, the electrical connection is reliable, and highly accurate and reliable measurement is easily realized, and its practical value is great.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to FIG. 9 are for explaining one embodiment of the present invention. FIG. 1 is an overall perspective view showing a measuring probe, and FIG. Sectional view of the measuring probe, FIG. 3 is a plan view showing the casing, FIG. 4 is a front view of FIG. 3, FIG. 5 is a side view of FIG. 4, and FIG. 6 is a bottom view of FIG. FIG. 7 is an exploded perspective view of a measurement probe including a pair of casings, FIG. 8 is a perspective view showing an assembled state of the measurement probe, and FIG. 9 is a front view showing a used state of the measurement probe. 10 to 13 are for explaining an example of a conventional measurement probe, FIG. 10 is an overall perspective view of the measurement probe, FIG. 11 is a cross-sectional view of the measurement probe of FIG. FIG. 12 is an exploded perspective view of the measurement probe, and FIG. 13 is a front view showing a usage state of the measurement probe. (11) …… Casing, (11a) …… Clip part, (11
b) …… Grip, (11c) …… Shaft support, (11d) …… Neck, (13) …… Terminal fittings, (16) …… Recess, (24) ……
spring.

Claims (1)

[Scope of utility model registration request] 1. A clip part having a terminal metal fitting attached to its tip, and a thin neck part bent and extending from the clip part and having a recess formed on one side surface thereof, to the rear from the clip part. It consists of a pair of casings of the same shape that integrally forms a long gripping part that extends and a shaft support provided at the rear end of this gripping part. And the opposite casings are crossed at the necks, and the shafts of the opposite casings are urged between the clip parts by the elastic force of the springs interposed between the parts near the necks of the grips. A measuring probe characterized in that the branches are pivotally attached to each other.