The purpose of latch mechanism 216 moving to the closed configuration is to insert PCI cassette 202 into CSCB 100 (shown in FIG. 1A). This is accomplished by a user (not shown) pressing on finger pad 228. Because latch 222 is rotatably connected to housing 210 by pin 230, latch 222 rotates about pin 230 which causes pawl 232 to engage lug 106. Latch 222 can be captured by lock 234, which maintains latch mechanism 216 in the closed configuration. Similarly, latching mechanism 216 can move to the opened configuration to extract PCI cassette 202 from CSCB 100. This is accomplished by a user disengaging lock 234 and rotating finger pad 228 away from housing 210. This causes latch 222 to rotate about pin 230 which causes pawl 236 to engage the opposite side of lug 106.

Latch 222 itself includes secondary spring 238 between mounting portion 240 and the main body 242 of latch 222. When latch mechanism 216 is in the closed configuration, secondary spring 238 also elastically deforms. Thereby, both primary spring 218 and secondary spring 238 exert force on PCI cassette 102 towards CSCB 100, which ensures that the connection between input connector 108 and output connector 114 (both shown in FIG. 1A) is maintained. In addition, any twisting movement of latch 222 under load is prevented by being sandwiched between housing 210 and brace 224.