Ejector mechanism for a card connector

A card connector for engaging an inserted electrical card comprises a dielectric terminal housing, a metal card housing defining first and second shaft holes therein, and an ejector mechanism. The ejector mechanism consists of a push rod, an actuator having first and second pivots formed thereon, an ejection plate, and a spring. When a card is inserted into the card connector, the first pivot abuts against a first edge of the first shaft hole and the second pivot abuts against a first edge of the second shaft hole. To eject the card, a force is exerted on an exerting projection of the push rod. The actuator pivots about the first pivot, the second pivot abuts against a second edge of the second shaft hole, and the card is pushed outward. This action constitutes the first ejection stage which disengages the card from contacts of the card connector. As the exerting projection of the push rod is pushed further, the actuator pivots about the second pivot and the first pivot abuts against a second edge of the first shaft hole. This action constitutes the second ejection stage which pushes the card out of the card connector.

BACKGROUND OF THE INVENTION 
1. Field of the Invention 
The present invention relates to a card connector ejector mechanism, and 
particularly to a card connector ejector mechanism which is easy to 
assemble and which provides a stable operation thereby preventing 
disconnection between components thereof. 
2. The Prior Art 
Portable or laptop computers are provided with card connectors for 
receiving an IC card which expands the memory thereof. Each card connector 
is equipped with an ejector mechanism for ejecting an inserted IC card. 
The ejector mechanism commonly includes a push bar, an actuator, and an 
ejection plate whereby when the push bar is activated by a user, the 
inserted card will be ejected. 
The configuration of the ejector mechanism depends on the type of card used 
with the connector. Taiwan Patent Application No. 83107162 and U.S. Pat. 
No. 5,456,610 each disclose an ejector mechanism having a cutout defined 
in a push bar for engaging with a tab of an ejection plate. U.S. Pat. No. 
5,421,737 discloses a card ejector mechanism having a pivotal connection 
between a push rod and a tab of an ejection plate. Taiwan Patent 
Application No. 83107162 and U.S. Pat. Nos. 5,149,276 and 5,451,168 
disclose ejector mechanisms including a third member which links a push 
rod to an ejection plate. In another embodiment of U.S. Pat. No. 5,451,168 
the third member has a retaining portion for connecting with the 
connector. 
The above disclosed ejector mechanisms comprise many components which 
complicates assembly and results in increased manufacturing costs. In 
addition, the connection between the push rod and the tab of the ejection 
plate may become disengaged during actuation of the ejector mechanism. 
Furthermore, the assembly of the third member between the push rod and 
ejection plate is difficult and unstable. 
Hence, an improved card connector ejector mechanism is requisite to 
eliminate the above mentioned defects of current card connector ejector 
mechanisms. 
SUMMARY OF THE INVENTION 
Accordingly, an objective of the present invention is to provide an easily 
assembled ejector mechanism for a card connector of a computer. 
Another objective of the present invention is to provide an ejector 
mechanism for a card connector having a stable arrangement which prevents 
disengagement between components thereof. 
A further objective of the present invention is to provide an ejector 
mechanism for a card connector having a connecting member provided between 
a push rod and an ejection plate. 
Yet another objective of the present invention is to provide an ejector 
mechanism for a card connector wherein ejection of the card takes place in 
two stages and is facilitated by two guiding means. 
To fulfill the above mentioned objectives, according to a preferred 
embodiment of the present invention, a card connector for engaging an 
inserted electrical card comprises a dielectric terminal housing, a metal 
card housing defining first and second shaft holes therein, and an ejector 
mechanism. The ejector mechanism consists of a push rod, an actuator 
having first and second pivots formed thereon, an ejection plate, and a 
spring. When a card is inserted into the card connector, the card abuts 
against ejecting pads of the ejection plate, the first pivot abuts against 
a first edge of the first shaft hole and the second pivot abuts against a 
first edge of the second shaft hole. To eject the card, a force is exerted 
on an exerting projection of the push rod. The actuator pivots about the 
first pivot, the second pivot abuts against a second edge of the second 
shaft hole, and the ejecting pads of the ejection plate push the card 
outward. This action constitutes the first ejection stage which disengages 
the card from contacts of the card connector. As the exerting projection 
of the push bar is pushed further, the actuator pivots about the second 
pivot and the first pivot abuts against a second edge of the first shaft 
hole. This action constitutes the second ejection stage which pushes the 
card out of the card connector. 
These and additional objectives, features, and advantages of the present 
invention will become apparent after reading the following detailed 
description of the preferred embodiments of the invention taken in 
conjunction with the appended drawing figures.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
Reference will now be made in detail to the preferred embodiment of the 
present invention. 
Referring to FIG. 1, a card connector in accordance with the present 
invention includes a dielectric terminal housing 1, a metal card housing 
2, and an ejector mechanism 3. 
The elongate terminal housing 1 is formed with two guiding arms 12 at 
lateral ends thereof, a fixing plate 15 defining a number of openings 151 
therethrough disposed between the guiding arms 12, and a recess 11 for 
receiving a bolt (not shown) defined in each guiding arm 12 for fastening 
the terminal housing 1 to a printed circuit board (not shown). A plurality 
of first and second contacts 13, 14 are fixedly received in the terminal 
housing 1. 
The rectangular card housing 2 is formed by a metal stamping procedure to 
have two U-shaped elongate side portions 22, 23 extending downward from 
opposite sides thereof, two pairs of attaching portions 24, 25 each 
extending from opposite lateral sides of the card housing 2 for attachment 
to the PCB, and a pair of guiding hooks 233, 234 and a pair of flanges 
235, 236 extending from the side portion 23 and defining a guiding passage 
26 defined therebetween. A first engaging projection 232 extends from the 
side portion 23 adjacent to the flange 235. Guiding grooves 221, 231 are 
defined along inner faces of the side portions 22, 23 for guiding an 
electrical card 4 (FIG. 4A) therethrough. A first shaft hole 211, a second 
shaft hole 212, a rectangular window 215, and a biasing portion 216 with a 
groove 217 are all defined through a rear portion of the card housing 2. A 
retaining portion 213 downwardly extends from a rear edge of the card 
housing 2. 
The ejector mechanism 3 comprises an elongate push rod 31, an actuator 32, 
a rectangular ejection plate 33, and a spring 34. The push rod 31 forms an 
exerting projection 311 laterally extending from a middle portion thereof 
for receiving an external force from a user, a second engaging projection 
312 adjacent to the exerting projection 311, and an L-shaped connecting 
member 313 at an end thereof defining an opening 314 therethrough. The 
actuator 32 forms a tongue 3211 at one end thereof, a connecting portion 
323 downwardly extending from another end thereof with a connecting tab 
3231 forwardly extending therefrom, first and second pivots 324, 325 
projecting from a top surface thereof, an engaging aperture 328 near the 
tongue 3211, and a rear edge 326 with a fulcrum point 327 formed in a 
middle portion thereof. The ejection plate 33 forms a pair of ejecting 
pads 331 downwardly extending from lateral ends thereof and an engaging 
tab 332 projecting from a rear edge thereof. 
In assembly as shown in FIGS. 2A, 2B, and 3, the engaging tab 332 of the 
ejection plate 33 extends through the engaging aperture 328 of the 
actuator 32 from a bottom surface thereof. The actuator 32 together with 
the ejection plate 33 is then attached to the card housing 2 whereby the 
first and second pivots 324, 325 of the actuator 32 are received in the 
first and second shaft holes 211, 212 of the card housing 2, respectively. 
The tongue 3211 of the actuator 32 extends through the groove 217 and 
rests on the biasing portion 216 of the card housing 2. The window 215 of 
the card housing 2 provides the engaging tab 332 with clearance whereby 
movement thereof is unhindered. The push rod 31 is received in the guiding 
passage 26 of the card housing 2 and the connecting tab 3231 extends 
through the opening 314 of the push rod 31. The spring 34 is disposed 
between the first engaging projection 232 of the card housing 2 and the 
second engaging projection 312 of the push rod 31. The attaching portions 
24 of the card housing 2 are received in the corresponding recesses 11 of 
the terminal housing 1. The assembled card connector is then positioned on 
a PCB and the bolts are inserted through the attaching portions 24, 25 of 
the card housing 2 to mount the card connector thereon. 
When the card 4 is inserted into the card connector as shown in FIGS. 4a 
and 4B, the card 4 abuts against the ejecting pads 331 of the ejection 
plate 33, the first pivot 324 abuts against a first edge 2111 of the first 
shaft hole 211, the second pivot 325 abuts against a first edge 2121 of 
the second shaft hole 212, and the rear edge 326 of the actuator 32 abuts 
against the retaining portion 213 of the card housing 2. To eject the card 
4, a force is exerted on the exerting projection 311 of the push rod 31 in 
the direction indicated by the arrow in FIG. 5A. The actuator 32 pivots 
about the first pivot 324, the second pivot 325 abuts against a second 
edge 2122 of the second shaft hole 212, the fulcrum point 327 abuts 
against the retaining portion 213, and the tongue 3211 of the actuator 32 
moves along the groove 217 which causes the ejecting pads 331 of the 
ejection plate 33 to push the card 4 outward, as shown in FIG. 5B. This 
action constitutes the first ejection stage which disengages the card 4 
from the contacts 13, 14 of the card connector. As the exerting projection 
311 of the push rod 31 is pushed further, the actuator 32 pivots about the 
second pivot 325, the first pivot 324 abuts against a second edge 2112 of 
the first shaft hole 211, and the tongue 3211 of the actuator 32 moves to 
an end of the groove 217. This action constitutes the second ejection 
stage which pushes the card 4 out of the card connector, as shown in FIGS. 
6A and 6B. It is noted that the transition from the first ejection stage 
to the second ejection stage is smooth whereby the card 4 can be easily 
and effectively ejected from the card connector. 
While the present invention has been described with reference to a specific 
embodiment, the description is illustrative of the invention and is not to 
be construed as limiting the invention. Various modifications to the 
present invention can be made to the preferred embodiment by those skilled 
in the art without departing from the true spirit and scope of the 
invention as defined by the appended claims.