JP2008270026A - Terminal pulling out jig - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a terminal pulling-out jig with which workability is improved without raising any obstacle for a bending action of a lance. <P>SOLUTION: When a bending of a lance 12 progresses, an elastic recovering force of the lance 12 becomes large, but since in a contact area of the lance 12 in a pressing surface 31, an inclination angle against a pressing direction to the lance 12 is small, a friction resistance due to a pressing action is small, and a resistance force combined by the friction resistance due to the pressing action and the elastic recovering force of the lance 12, namely, a necessary operation force does not become large in excess, the inclination angle of the pressing surface 31 against the pressing direction to the lance 12 becomes larger toward an upper end side of the pressing surface 31, and since a distance between a lower end and an upper end of the pressing surface in a back and forth direction is controlled to be small, a dislocation preventing projection 12A and the pressing surface 31 do not interfere with each other even if the lance 12 is bent to a maximum extent. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a terminal extraction jig.

Patent Document 1 describes a connector in which a lance is locked in a locking hole of a terminal fitting inserted into a housing from the rear, and the terminal fitting is prevented from being pulled out by the locking action. As shown in FIG. 6, the lance 100 as a whole extends forward in a cantilevered manner, and a retaining protrusion 102 that protrudes upward from a position behind the front end of the lance 100 on the upper surface facing the terminal fitting 101. The retaining protrusion 102 is inserted into the locking hole 103 of the terminal fitting 101 and locked. A terminal extraction jig 105 for elastically bending the lance 100 in the direction of dissociating from the terminal fitting 101 is brought into contact with the front end of the lance 100.
Patent Document 2 describes a terminal extraction jig for releasing the lance from the terminal fitting and releasing the terminal fitting. As shown in FIG. 6, the terminal extraction jig 105 presses the front end of the lance 100 from the front, and the pressing surface 106 is inclined with respect to the pressing direction of the terminal extraction jig 105 against the lance 100. When the front end of the lance 100 is pushed by the inclined pressing surface 106, the front surface of the lance 100 is disengaged from the terminal fitting 101 while sliding the front end downward on the pressing surface 106 due to the inclination of the pressing surface 106. It is elastically bent downward.
JP 2003-272744 A JP 2000-223238 A

In the lance 100 described above, since the upper end of the retaining projection 102 is at a position higher than the fulcrum of the lance 100, the lance 100 is elastically bent so as to be disengaged from the terminal fitting 101 while lowering its front end. 6 to 8, the upper end of the retaining protrusion 102 is displaced forward.
Therefore, in order to reduce the frictional resistance between the pressing surface 106 and the lance 100, as shown in FIG. 9, when the inclination angle of the pressing surface 108 with respect to the pressing direction of the terminal extraction jig 107 is reduced, the lance While the 100 is bent in the dissociation direction, the upper end of the retaining protrusion 102 hits the pressing surface 108, and further bending of the lance 100 in the dissociation direction is prevented. In this case, the terminal protrusion 101 cannot be removed because the retaining protrusion 102 cannot be completely removed from the retaining hole 103.
Therefore, conventionally, as shown in FIGS. 6 to 8, the inclination angle of the pressing surface 106 with respect to the pressing direction of the terminal extraction jig 105 is set to a large angle close to a right angle, and the lance 100 is bent to the maximum. Even in this state, the retaining protrusion 102 is prevented from coming into contact with the pressing surface 106. However, in this case, since the frictional resistance between the pressing surface 106 and the lance 100 is increased, a large pressing force is required for the operation of the terminal extraction jig 105, and the operability is poor. In particular, as the amount of bending of the lance 100 increases, the elastic restoring force of the lance 100 increases, so that the pressing force required to resist the elastic restoring force of the lance 100 increases at the end of the operation. Therefore, the operability is further lowered.
The present invention has been completed based on the above-described circumstances, and an object thereof is to improve operability without hindering the bending operation of the lance.

As a means for achieving the above object, the invention of claim 1 is a configuration in which the terminal fitting is inserted from the rear in a cantilevered form, and is located slightly behind the front end. A lance having a retaining protrusion protruding upward, and a terminal extracting jig used for a connector configured to retain the terminal fitting by locking the retaining protrusion to the terminal fitting. The front end of the lance can be pressed from the front and has a pressing surface inclined with respect to the pressing direction, and the front end of the lance pressed by the pressing surface is slid downward on the pressing surface. As the lance is elastically bent so as to be in a front-down position while being moved, the retaining protrusion is dissociated from the terminal bracket while being displaced obliquely forward and downward, and the terminal bracket is removed backward. Allow In the terminal extracting tool that is a power sale, the pressing surface has a characteristic where the inclination angle with respect to the pressing direction to the lance there is a smaller form downward.
The invention of claim 2 is characterized in that, in the invention of claim 1, the pressing surface is formed of a curved surface that smoothly continues from the upper end toward the lower end.

<Invention of Claim 1>
When the lance is elastically bent downward, the tip of the lance slides from the top to the bottom of the pressing surface. Therefore, while the amount of bending of the lance is small, the lance is pressed between the pressing surface and the pressing surface. The frictional resistance generated between them is relatively large, but since the elastic restoring force of the lance at this time is small, the frictional resistance caused by the pressing action of the pressing surface and the frictional resistance caused by the elastic restoring force of the lance are combined. The drag, i.e. the required operating force, does not become excessively large.
As the elastic deformation of the lance progresses, the elastic restoring force of the lance increases, and the frictional resistance caused by the elastic restoring force also increases. Since the inclination angle with respect to the direction is small, the frictional resistance due to the pressing action is also small. Therefore, the drag force that combines the frictional resistance caused by the pressing action and the frictional resistance caused by the elastic restoring force, that is, the necessary operating force does not become excessively large.
As described above, when the terminal extraction jig of the present invention is used, the operation force does not increase or decrease greatly until the lance begins to bend until the lance begins to bend. Excellent in properties.
Moreover, since the inclination angle with respect to the pressing direction of the pressing surface with respect to the lance increases toward the upper end side of the pressing surface, the distance between the lower end and the upper end of the pressing surface in the front-rear direction is kept small. Therefore, even if the lance is bent most and the retaining projection is displaced obliquely forward and downward, the retaining projection and the pressing surface do not interfere with each other. That is, according to the present invention, even if the operability is improved as described above, the bending operation of the lance is not hindered.
<Invention of Claim 2>
Since the pressing surface is a smoothly continuous curved surface, when the front end of the lance slides on the pressing surface, it does not get caught, and the resistance is reduced correspondingly and the operability is further improved.

<Embodiment 1>
A first embodiment embodying the present invention will be described below with reference to FIGS. The connector according to the present embodiment is configured such that the terminal fitting 20 inserted into the housing 10 is prevented from being removed by the lance 12 and the retention of the lance 12 is released by the terminal removing jig 30.

  A cavity 11 having a shape penetrating in the front-rear direction is formed in the housing 10. The lance 12 extends in a cantilevered manner almost horizontally forward along the lower wall of the cavity 11, and enters the bending space 13 below (opposite to the terminal fitting 20) with its rear end as a fulcrum. It can be elastically bent. The lance 12 in a horizontal free state (see FIGS. 2 and 3) that is not elastically bent assumes a locking posture that can be locked to the terminal fitting 20, and the lance 12 that is elastically bent downward is lowered forward. As shown in FIG. On the upper surface of the lance 12 (the surface facing the terminal fitting 20), a retaining projection 12A that protrudes upward from a position slightly behind the front end of the lance 12 is integrally formed. The front surface of the retaining protrusion 12A is a locking surface 12S that is substantially perpendicular to the front-rear direction (the direction parallel to the insertion / extraction direction of the terminal fitting 20 with respect to the cavity 11). The position of the upper end of the retaining projection 12A is higher than the fulcrum of elastic deformation of the lance 12 (the rear end of the lance 12). Further, a region from the front end of the lance 12 to the retaining protrusion 12A is a wedge-shaped contact portion 12B whose thickness gradually decreases toward the front. In addition, a space in front of the lance 12 in the housing 10 communicates with the cavity 11 and is a die cutting space 14 that opens to the front end surface of the housing 10. A terminal extracting jig 30 is inserted from the terminal.

  The terminal fitting 20 is a well-shaped male shape integrally formed with a rectangular tubular box portion 21, a tab 22 protruding forward from the box portion 21, and an electric wire crimping portion 23 extending rearward from the box portion 21. A locking hole 24 is formed in the lower surface of the box portion 21. The terminal fitting 20 is inserted into the cavity 11 from the rear, and in the middle of the insertion, the lower surface of the box portion 21 abuts against the retaining protrusion 12A and pushes it down, so that the lance 12 takes the unlocking posture. When the terminal fitting 20 is inserted to the proper position, the locking hole 24 reaches a position corresponding to the retaining protrusion 12A, the lance 12 is elastically restored upward by its elastic restoring force, and the retaining protrusion 12A is engaged. The locking surface 12 </ b> S of the retaining protrusion 12 </ b> A is engaged with the front edge portion of the opening edge of the locking hole 24 by being fitted into the retaining hole 24. Due to this locking action, the terminal fitting 20 is restrained from moving rearward and held in a retaining state. The locking of the lance 12 is released by causing the lance 12 in the locking position to be elastically bent to the locking releasing position by a terminal pulling jig 30 described later and disengaging the locking protrusion 12A from the locking hole 24. Is called.

Next, the terminal extraction jig 30 will be described.
The terminal extracting jig 30 is made of metal that is elongated and linearly protrudes from a gripping portion (not shown), and the height dimension of the terminal extracting jig 30 is slightly smaller than the height of the die cutting space 14 of the housing 10. A small dimension, that is, a dimension in which the terminal extraction jig 30 can be inserted in the mold extraction space 14 without rattling in the vertical direction. An overhang (that is, a form facing obliquely downward) pressing surface 31 for pressing the front end of the abutting portion 12B of the lance 12 from the front is formed at the tip of the terminal extraction jig 30. The pressing surface 31 has a configuration in which the inclination angle with respect to the pressing direction (front-rear direction) to the lance 12 gradually decreases from the upper end to the lower end, and the arc surface that smoothly continues from the upper end to the lower end of the pressing surface 31. (A curved surface with a constant curvature). In other words, the pressing surface 31 is inclined with respect to the pressing direction of the pressing surface 31 against the lance 12.

Next, the operation of this embodiment will be described.
When the terminal removal jig 30 is inserted into the die-cutting space 14 from the front in a state where the terminal fitting 20 is prevented from being removed by the lance 12, as shown in FIG. 3, the pressing surface 31 is placed at the front end of the lance 12 in the locking posture. The lance 12 is elastically bent downward by this pressing force and the inclination of the pressing surface 31. The contact position of the pressing surface 31 with the lance 12 at this time is a position close to the upper end and forms an angle close to a right angle with respect to the contact direction (= pressing direction) with the lance 12. When the front end of the lance 12 is pressed, the frictional resistance due to the pressing action of the pressing surface 31 is relatively large. However, since the amount of elastic deformation of the lance 12 at this time is small, the frictional resistance generated between the pressing surface 31 and the lance 12 due to the elastic restoring force of the lance 12 is small. Therefore, at the initial stage of elastic deformation of the lance 12, a drag force that combines the frictional resistance caused by the pressing action of the terminal removal jig 30 and the frictional resistance caused by the elastic restoring force of the lance 12, that is, applied to the terminal removal jig 30. The necessary operating force that should be avoided does not become excessively large.

  As this pressing proceeds, the downward elastic deflection amount of the lance 12 increases, and the contact position of the pressing surface 31 with the lance 12 gradually moves downward (see FIG. 4). That is, the front end of the contact portion 12B of the lance 12 slides downward on the pressing surface 31. As the amount of elastic deflection of the lance 12 increases, the elastic restoring force of the lance 12 also increases, and the frictional resistance caused by this elastic restoring force gradually increases. On the other hand, the inclination angle of the contact position with the lance 12 with respect to the pressing direction to the lance 12 gradually decreases as the elastic deformation of the lance 12 proceeds. The frictional resistance generated with the lance 12 is gradually reduced. Therefore, even if the elastic deformation of the lance 12 is advanced, the drag (necessary operating force) combining the frictional resistance caused by the pressing action and the frictional resistance caused by the elastic restoring force does not increase excessively. . Further, as the elastic deformation of the lance 12 proceeds, the retaining protrusion 12A is displaced obliquely forward and downward (that is, the direction approaching the pressing surface 31 in the front-rear direction), and the retaining protrusion 12A, the locking hole 24, and the like. And the pressing surface 31 approaches the retaining protrusion 12A.

  Then, when the elastic deflection amount of the lance 12 is maximized, as shown in FIG. 5, the retaining projection 12A is completely removed from the retaining hole 24 and the retaining state by the lance 12 is released, and the terminal fitting 20 is moved backward. It can be extracted. At this time, since the amount of elastic deflection of the lance 12 is maximized, the elastic restoring force of the lance 12 is also maximized, and the frictional resistance caused by the elastic restoring force is maximized. On the other hand, the abutting position of the pressing surface 31 with the lance 12 is the lowest position, that is, the position where the inclination angle with respect to the pressing direction to the lance 12 becomes the smallest, and the friction caused by the pressing action immediately before reaching this position. Resistance is minimal. Accordingly, even when the release operation of the lance 12 by the terminal removal jig 30 is completed, the drag (necessary operating force) combining the frictional resistance caused by the pressing action and the frictional resistance caused by the elastic restoring force is excessive. It will never grow.

  As described above, when the terminal extraction jig 30 according to the present embodiment is used, the operation force does not greatly increase or decrease from when the lance 12 starts to bend until it is bent. Excellent operability when performing.

  Further, when the amount of elastic deflection of the lance 12 is maximized and the unlocking by the lance 12 is completed, the upper end edge of the retaining surface 12S of the retaining projection 12A is the lowest and most pressed. Displace to a position close to the surface 31. However, in the present embodiment, the inclination angle of the pressing surface 31 with respect to the pressing direction of the lance 12 increases toward the upper end side of the pressing surface 31, so the lower end of the pressing surface 31 in the front-rear direction (the front end of the lance 12). ) And the upper end (the position at which the upper end of the retaining protrusion 12A approaches) is kept small, and therefore the retaining protrusion 12A and the pressing surface 31 are not in contact with each other. As described above, according to the terminal extraction jig 30 of the present embodiment, the pressing operation of the lance 12 by the pressing surface 31, that is, the terminal extraction jig 30 of the terminal extraction jig 30 due to the interference of the retaining protrusion 12 </ b> A with the pressing surface 31. There is no hindrance to the operation.

  Further, in the present embodiment, the pressing surface 31 is a curved surface that is smoothly continuous from the upper end to the lower end, so that the front end of the lance 12 does not get caught when sliding on the pressing surface 31. As a result, the resistance is reduced and the operability is further improved.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the above embodiment, the pressing surface is a curved surface that is smoothly continuous with a substantially constant curvature over the entire region. However, according to the present invention, the pressing surface is inclined with respect to the pressing direction of the terminal extraction jig. A plurality of flat slopes having different angles may be continuously arranged such that the inclination angles change sequentially.
(2) In the above embodiment, the curvature of the curved surface constituting the pressing surface is made constant. However, according to the present invention, the curved surface constituting the pressing surface changes in curvature from the upper end to the lower end of the pressing surface. Form may be sufficient.

Sectional drawing showing the state in which the terminal metal fitting is secured by the lance in Embodiment 1 Partial enlarged sectional view showing the state in which the terminal fitting is secured by the lance. Partial enlarged sectional view showing the state where the tip of the jig is in contact with the front end of the lance Partial enlarged sectional view showing a state where the lance is elastically bent by about half due to the pressing of the jig. Partial enlarged sectional view showing a state in which the lance is elastically bent until it is disengaged from the terminal fitting by pressing the jig. Sectional drawing which shows the state which the front-end | tip of the jig | tool contact | abutted the front end of the lance in the prior art example Sectional view showing the state where the lance is elastically bent by about half due to the pressing of the jig in the conventional example Sectional drawing which shows the state which elastically bent until the lance disengaged from the terminal metal fitting by pressing of the jig in the conventional example Sectional view showing a state where the retaining protrusion is in contact with the pressing surface of the jig when the lance is elastically bent by about half in the conventional example

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Housing 12 ... Lance 12A ... Stop protrusion 20 ... Terminal metal fitting 30 ... Terminal extraction jig | tool 31 ... Pressing surface

Claims (2)

A lance having a retaining projection protruding upward at a position slightly rearward of the front end is formed in the housing into which the terminal fitting is inserted from the rear and is cantilevered forward. A terminal extraction jig used in a connector adapted to prevent the terminal fitting from being locked by locking a protrusion to the terminal fitting,
The front end of the lance can be pressed from the front, and has a pressing surface that is inclined with respect to the pressing direction.
As the front end of the lance pressed by the pressing surface is slid downward on the pressing surface, the retaining protrusion is moved obliquely forward and downward as the lance is elastically bent so as to be in a forward-downward posture. In a terminal extraction jig that is disengaged from the terminal fitting while being displaced, and allows the withdrawal of the terminal fitting to the rear,
The terminal pulling jig, wherein the pressing surface is configured such that an inclination angle with respect to a pressing direction to the lance decreases downward. 2. The terminal extracting jig according to claim 1, wherein the pressing surface is a curved surface that smoothly continues from the upper end to the lower end.

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