JP4017165B2 - Heart cam mechanism and push-push card connector - Google Patents

Description

  The present invention relates to a heart cam mechanism that performs pushing and releasing by repeating a push operation, and a push-push type card connector that performs insertion into a connector of a card and ejection from the connector.

  As a conventional technique, a push-push card connector will be described with reference to FIGS. 7 to 10 (see, for example, Patent Document 1).

  FIG. 7 is an exploded perspective view of the connector, FIG. 8 is a perspective view showing a state before the card is inserted into the connector, and FIGS. 9A to 9E sequentially show the process of inserting and ejecting the card from the connector. FIG. 10 is a perspective view showing the process of the guide pin of the cam follower guided by the cam groove of the heart cam in the connector.

  The connector 1 includes an insulator 2, a plurality of contacts 3 fixed to the insulator 2, an eject lever 4 attached to a frame portion 2 </ b> A of the insulator 2, and a compression coil spring 5 that constantly urges the eject lever 4 in the discharging direction. And a cam follower 6 guided by a heart cam 4C formed on the eject lever 4. The card 11 is inserted into the connector 1 and ejected from the connector 1.

  The individual components will be described in detail. The insulator 2 is manufactured from a synthetic resin in a substantially rectangular shape, and U-shaped frame portions 2A, 2B, and 2C are formed on three sides thereof. Each contact 3 has a convex curved contact portion 3A on one end side and a flat contact portion 3B on the other end side. The eject lever 4 is manufactured in a substantially L shape from a synthetic resin, has a guide portion 4A and a right-angle bent portion 4B, a heart cam 4C is formed on one surface of the guide portion 4A, and a card of the right-angle bent portion 4B. The tip of the card 11 comes into contact with the contact portion 4D. The guide portion 4A of the eject lever 4 is slidably accommodated in a groove (not shown) having a U-shaped cross section formed in the frame portion 2A, and is compressed in a groove 4E formed on one surface of the guide portion 4A. The spring 5 is inserted. One end of the compression coil spring 5 is in pressure contact with the eject lever 4, and the other end is in pressure contact with the inner surface of the frame portion 2C. Accordingly, the eject lever 4 is constantly urged by the compression coil spring 5 in the direction in which the card 11 is ejected from the connector 1. The cam follower 6 is made of metal and is formed in a lever shape, and is disposed in a notch 2D formed outside the frame portion 2A so as to be rotatable by a predetermined angle. A hole 6A formed in the base portion of the cam follower 6 fits into a shaft 2E formed in the frame portion 2A, and a guide pin 6B formed in a bent portion at the distal end portion of the cam follower 6 is provided in the frame portion 2A. (Not shown) is passed through and engaged with the cam groove of the heart cam 4C.

  The entire connector 1 is covered with a rectangular cover (not shown).

  Details of the heart cam 4C of the eject lever 4 will be described with reference to FIG. A heart cam 4C is formed on one surface of the guide portion 4A of the eject lever 4. The heart cam 4C includes a circle 1 at the starting point of the guide pin 6B of the cam follower 6, a circle 2 at the guide portion inclined with respect to the sliding direction of the eject lever 4, a circle 3 at the heart-shaped recess, and an eject lever. 4 is formed as a circular guide rail (cam groove) from the circle 4 of the guide portion parallel to the sliding direction 4 and the circle 5 of the end point of the guide pin 6B, that is, the circle 1 of the starting point. . In the free state, the guide pin 6B is biased rightward in FIG. 10 by the elasticity of the cam follower 6.

  Insertion and ejection (extraction) of the card 11 from the connector 1 will be described with reference to FIGS.

  First, FIG. 9A shows a free state in which a part of the card 11 is inserted into the connector 1. In FIG. 10, the guide pin 6B of the cam follower 6 is positioned in the circle 1 at the starting point of the heart cam 4C. To do.

  Next, FIG. 9B shows that the card 11 and the eject lever 4 are integrated by pushing the card 11 inward of the connector 1 and the tip of the card 11 abuts on the card abutting portion 4D of the eject lever 4. Thus, it is in a state of being slid into the connector 1 while resisting the compressive force of the compression coil spring 5. In FIG. 10, the guide pin 6B is located in the circumference 2 of the guide portion inclined with respect to the sliding direction of the eject lever 4 in the heart cam 4C.

  Subsequently, when the card 11 is pushed to the maximum stroke and then the push is stopped, the card 11 and the eject lever 4 are slightly returned by the restoring force of the compression coil spring 5 to reach the state shown in FIG. . FIG. 9C shows a fitting state in which a plurality of pads (not shown) of the card 11 are in contact with the convex curved contact portions 3A of the plurality of contacts 3. In FIG. 10, the guide pin 6B is a heart cam. It lies in the circle 3 of the 4C heart-shaped recess. Thus, the card 11 fitting operation is completed.

  When the push is stopped after the card 11 is pushed to the maximum stroke again, in FIG. 10, the guide pin 6B escapes from the circle 3 of the heart-shaped recess of the heart cam 4C and moves in the sliding direction of the eject lever 4. Then, it passes through a circle 4 of the parallel guide portion and reaches a circle 5 at the end point, that is, a circle 1 at the starting point. The card 11 and the eject lever 4 reach the state shown in FIG. 9E through the state shown in FIG. 9D due to the restoring force of the compression coil spring 5. Thus, the card 11 ejection operation is completed.

  In the above embodiment, the heart cam 4C is formed on the eject lever 4 and the cam follower 6 is provided on the insulator 2. However, the design can be changed so that the heart cam is formed on the insulator and the cam follower is provided on the eject lever.

  A schematic diagram of a heart cam mechanism in the conventional connector 1 is shown in FIG. 11 (a) is a front view of the state before the heart cam 4C is pushed, FIG. 11 (b) is a front view of the state in which the heart cam 4C is pushed, and FIG. 11 (c) is a line A- in FIG. Sectional views according to A are shown respectively.

  In FIG. 11A, the hole 6A at one end of the cam follower 6 is supported by the insulator 2, and the guide pin 6B at the other end is located in the circle 1 at the starting point of the groove of the heart cam 4C. The guide pin 6B is urged rightward by the elasticity of the cam follower 6 in the free state.

  With the fingers, the heart cam 4C is pushed in the direction of the white arrow against the compression coil spring 5. Then, the guide pin 6B reaches from the position of the circle 1 at the starting point to the maximum stroke through the circle 2 at the guide portion. Subsequently, when the finger is separated from the heart cam 4C, the heart cam 4C slightly returns due to the reaction force of the compression coil spring 5, and the guide pin 6B enters the circle 3 of the recess of the heart cam 4C to reach the position of FIG. .

  When the heart cam 4C is opened, the heart cam 4C is pushed slightly against the compression coil spring 5 by fingers in the state of FIG. Then, the guide pin 6B extends from the position of the circle 3 of the recess of the heart cam 4C to the maximum stroke in the lower right direction. Thereafter, when the finger is separated from the heart cam 4C, the heart cam 4C reaches the position shown in FIG. At this time, the guide pin 6B reaches the end point circle 5, that is, the start point circle 1 through the circle 4 of the guide portion.

JP-A-2001-267013 (page 2, column 2, line 34 to page 3, column 4, line 26, FIGS. 1-4)

  In the prior art, if the finger is suddenly released from the eject lever 4 while the eject lever 4 (heart cam 4C) is being pushed in, a phenomenon occurs in which the eject lever 4 returns rapidly due to the reaction force of the compression coil spring 5. Further, if the finger is suddenly released from the eject lever 4 while the eject lever 4 is being opened, the same phenomenon occurs.

  Therefore, if the heart cam mechanism is implemented on a furniture door or the like, the door or the like is damaged. Further, if the eject lever mechanism is implemented in the card connector, the card may be damaged or lost.

  Therefore, the present invention improves the drawbacks of the prior art, and even when the heart cam or eject lever is being pushed in or released, even if the finger is suddenly moved away from the heart cam or eject lever, the heart cam or eject lever returns rapidly. It is an object of the present invention to provide a heart cam mechanism and a push-push type card connector in which no phenomenon occurs.

  The present invention employs the following means in order to solve the above problems.

1. The heart cam mechanism includes a heart cam, a cam follower guided by a cam groove provided in the heart cam, and an elastic member that constantly urges the heart cam in the opening direction of the object, In order to control the biasing force of the elastic member on one of the guide part used when pushing the object or the guide part used when opening the object, a shape that changes the traveling direction of the cam follower in small increments The other of the guide portions is not formed with a shape that changes the traveling direction of the cam follower in small increments, and a bypass groove is provided between one of the guide portions and the other of the guide portions. Heart cam mechanism.

2 . In the push-push type card connector having a heart cam mechanism, the heart cam mechanism is guided by an eject lever that slides together with the card, a heart cam provided in the eject lever, and a cam groove provided in the heart cam. A cam follower and an elastic member that constantly urges the eject lever toward the card ejection direction, and a guide portion used when the card is inserted into the cam groove, or when the card is ejected. In order to control the biasing force of the elastic member, one of the guide portions to be used has a shape that changes the traveling direction of the cam follower in small increments, and the other of the guide portions changes the traveling direction of the cam follower in small increments. The shape is not formed, one of the guide parts and the front Push bypass channel is provided between the other guide section - Connector for the push type card.

  As is apparent from the description of the specification, the present invention has the following effects.

  1. Even when the heart cam or eject lever is being pushed in or released, even if the finger is suddenly moved away from the heart cam or eject lever, the phenomenon that the heart cam or eject lever returns rapidly can be prevented.

  2. The heart cam mechanism is reliable in operation and simple in structure.

  3. The heart cam mechanism has a small number of parts, is easy to assemble and disassemble, and is low in cost.

  Four embodiments of the heart cam mechanism of the present invention, a push-push type card connector, and a furniture door will be described.

  A heart cam mechanism according to a first embodiment of the present invention will be described with reference to FIG. However, in the first embodiment, the description of the same points as the conventional heart cam mechanism shown in FIG. 11 will be omitted, and the differences will be described.

  The circular cam groove of the heart cam 4C has a first guide portion 4C1 shared by both reciprocating strokes parallel to the slide direction, a second guide portion 4C2 inclined with respect to the slide direction, and a parallel to the slide direction. Third guide portion 4C3, corrugated fourth guide portion 4C4, fifth guide portion 4C5 parallel to the sliding direction, sixth guide portion 4C6 inclined in the opposite direction to the sliding direction, and recess 4C7 And a seventh guide portion 4C8 inclined with respect to the sliding direction, an eighth guide portion 4C9 parallel to the sliding direction, and a ninth guide portion 4C10 inclined with respect to the sliding direction. . The ninth guide portion 4C10 is continuous with the first guide portion 4C1.

  The cam groove from the first guide portion 4C1 to the sixth guide portion 4C6 guides the guide pin 6B of the cam follower 6 when the heart cam 4C is pushed (outward travel). The cam groove from the seventh guide portion 4C8 through the ninth guide portion 4C10 to the first guide portion 4C1 guides the guide pin 6B of the cam follower 6 when the heart cam 4C is opened (return stroke).

  The fourth guide portion 4C4 has a wave shape. Accordingly, even if the finger is suddenly separated from the heart cam 4C while the heart cam 4C is being pushed in, the guide pin 6B is difficult to move in the fourth guide portion 4C4, so that the fourth guide portion 4C4 acts as a brake. Therefore, occurrence of a phenomenon in which the heart cam 4C returns rapidly due to the reaction force of the compression coil spring 5 is prevented.

  A heart cam mechanism according to a second embodiment of the present invention will be described with reference to FIG. However, in the second embodiment, description of the same points as in the first embodiment will be omitted, and different points will be described.

  In Example 1, the 4th guide part 4C4 is comprised by the waveform, and the 8th guide part 4C9 is comprised in parallel with respect to a sliding direction. On the other hand, in Example 2, the 8th guide part 4C9 is comprised by the waveform, and the 4th guide part 4C4 is comprised in parallel with respect to a sliding direction.

  Accordingly, even if the finger is suddenly released from the heart cam 4C while the heart cam 4C is being opened, the guide pin 6B is difficult to move in the eighth guide portion 4C9, so that the eighth guide portion 4C9 acts as a brake. Therefore, occurrence of a phenomenon in which the heart cam 4C returns rapidly due to the reaction force of the compression coil spring 5 is prevented.

  A heart cam mechanism according to a third embodiment of the present invention will be described with reference to FIG. However, in the third embodiment, description of the same points as in the first embodiment will be omitted, and different points will be described.

  In the first embodiment, only the fourth guide portion 4C4 is configured in a wave shape, whereas in the third embodiment, both the fourth guide portion 4C4 and the eighth guide portion 4C9 are configured in a wave shape.

  Therefore, even when the heart cam 4C is being pushed or released, even if the finger is suddenly separated from the heart cam 4C, the phenomenon that the heart cam 4C returns rapidly due to the reaction force of the compression coil spring 5 is prevented.

  A heart cam mechanism according to a fourth embodiment of the present invention will be described with reference to FIG. However, in the fourth embodiment, description of the same points as in the second embodiment will be omitted, and different points will be described.

  In the fourth embodiment, the fourth guide portion 4C4 parallel to the sliding direction of the second embodiment and the corrugated eighth guide portion 4C9 are continued by a tenth guide portion 4C11 serving as a bypass groove. C in FIG. 4A is a combined section of a return path at the time of pushing and a return path at the time of release.

  With this configuration, even when the finger is suddenly released from the heart cam 4C while the heart cam 4C is being pushed, the guide pin 6B moves from the fourth guide portion 4C4 to the wave-shaped eighth guide portion 4C9 via the tenth guide portion 4C11. Move. Therefore, the guide pin 6B is difficult to move in the eighth guide portion 4C9. Therefore, occurrence of a phenomenon in which the heart cam 4C returns rapidly due to the reaction force of the compression coil spring 5 is prevented.

  In addition, about the bypass groove | channel, in Example 1, between 8th guide part 4C9 and 4th guide part 4C4 can also be continued by 10th guide part 4C11.

  The configuration of the wave-shaped guide portion in the heart cam mechanism of each embodiment of the present invention is not limited to this, and it is a shape that changes the advancing direction of the guide pin in small increments and acts as a brake. Can be achieved.

(About use of the heart cam mechanism for furniture doors)
The case where the heart cam mechanism of each Example of this invention is used for the door of furniture is demonstrated with reference to FIG.

  A heart cam mechanism is installed near the hinge (not shown) of the door 17 of the furniture 16. Then, even if the finger is suddenly released from the door 17 at least during the closing or opening of the door 17, the phenomenon that the door 17 opens rapidly is prevented.

(Use of the heart cam mechanism for push-push card connectors)
A case where the heart cam mechanism of each embodiment of the present invention is used for an eject lever of a push-push type card connector will be described with reference to FIG. However, since the configuration other than the heart cam is the same as that of the conventional connector, description thereof is omitted.

  When the heart cam mechanism of the present invention is used for the eject lever 4, the card is rapidly ejected from the connector even if the finger is suddenly released from the eject lever 4 at least during the insertion of the card into the connector or the ejection from the connector. The occurrence of this phenomenon is prevented.

It is a typical front view of the heart cam mechanism of Example 1 of this invention. It is a typical front view of the heart cam mechanism of Example 2 of the present invention. It is a typical front view of the heart cam mechanism of Example 3 of the present invention. It is typical drawings of the heart cam mechanism of Example 4 of this invention, (a) is a front view of the principal part, (b) is sectional drawing by line AA in (a), (c) is (a). Sectional views along line BB in FIG. It is a perspective view of the furniture in which the heart cam mechanism of this invention was used for the door. FIG. 3 is an exploded perspective view of a push-push type card connector in which the heart cam mechanism of the present invention is used for an eject lever. It is a disassembled perspective view of the conventional push-push type card connector. It is a perspective view of the state before a card is inserted in the connector. (A)-(e) is a perspective view which shows sequentially the process of insertion and discharge | emission of the card | curd with respect to the connector. It is a perspective view which shows the process of the guide pin of the cam follower guided by the guide rail (cam groove) of the heart cam in the connector. It is a schematic diagram of the heart cam mechanism of the connector, (a) is a front view before pushing the heart cam, (b) is a front view after pushing the heart cam, (c) is a line A- in (b) Sectional views according to A are shown respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Push-push type card connector 2 Insulator 2A Frame part 2B Frame part 2C Frame part 2D Notch 2E Shaft 3 Contact 3A Convex curved contact part 3B Flat contact part 4 Eject lever 4A Guide part 4B Right angle bent part 4C Heart cam 4C1 1st 1 guide part 4C2 2nd guide part 4C3 3rd guide part 4C4 4th guide part 4C5 5th guide part 4C6 6th guide part 4C7 recessed part 4C8 7th guide part 4C9 8th guide part 4C10 9th guide part 4C11 10th guide part 4D card contact portion 4E groove 5 compression coil spring 6 cam follower 6A hole 6B guide pin 16 furniture 17 door

Claims (2)

The heart cam mechanism has a heart cam, a cam follower guided by a cam groove provided in the heart cam, and an elastic member that constantly urges the heart cam in the opening direction of the object,
In the cam groove, in order to control the biasing force of the elastic member to one of a guide part used when pushing the object or a guide part used when opening the object, the direction of travel of the cam follower A shape that changes the direction of the cam follower is not formed on the other of the guide portions, and a bypass groove is formed between one of the guide portions and the other of the guide portions. A heart cam mechanism characterized by that . In a push-push type card connector having a heart cam mechanism,
The heart cam mechanism includes: an eject lever that slides together with the card; a heart cam provided on the eject lever; a cam follower guided by a cam groove provided on the heart cam; An elastic member that urges toward the
In the cam groove, in order to control the biasing force of the elastic member, one of a guide portion used when inserting the card or a guide portion used when discharging the card, the traveling direction of the cam follower is changed. A shape that changes in small increments is formed, and a shape that changes the traveling direction of the cam follower in small increments is not formed on the other of the guide portions, and a bypass groove is formed between one of the guide portions and the other of the guide portions. A push-push type card connector characterized by being provided .

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