Electric module latch assembly

• US 4,931,907 A
• Filed: 03/30/1989
• Issued: 06/05/1990
• Est. Priority Date: 03/30/1989
• Status: Expired due to Term

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Tandem Computers Incorporated (HP Inc.)
• Inventors: Robinson, Richard P., Neilson, Joseph S.
• Primary Examiner(s): Scott, J. R.
• Application Number:
  US07/331,403
• Time in Patent Office: 432 Days
• Field of Search: 200/50 R, 200/54 A, 200/50 AA, 200/318, 200/321-325, 361/331, 361/332, 361/335, 361/338, 361/339, 361/390, 361/391, 361/392, 361/415, 312/320
• US Class Current: 361/727
• CPC Class Codes: H05K 7/1411 for securing or extracting box-type drawers
• CPC Class Codes: Y10S 439/911 Safety, e.g. electrical disconnection required before opening housing

Abstract

An electronic module (6) and integrally mounted latch assembly (2) includes a latch handle assembly (4) mounted to the module and a keeper (8) mounted to a housing (10). The latch handle assembly includes a U-shaped handle (18) having an elongate lever (42) pivotally mounted to one leg (22) of the handle at latch end (46) of the lever. The latch end has a cam surface (64) which engages the keeper. The outer, catch end (44) of the lever is configured to engage a spring-loaded catch button (50) mounted to the other leg (20) of the handle. A disenable switch pin (72) is mounted to the handle to resiliently engage the underside (80) of the lever so that when the lever is in the latched position, the lever keeps the disenable switch pin depressed. The pin is long enough to engage an enable switch (96) within the housing when so depressed. The initial movement of the lever away from, and the final movement towards, the handle permits the electrical connectors (12, 14) coupling the module and housing to be disconnected, and connected, under no-load conditions. The keeper is mounted to the housing so that it can move a short distance towards and away from the housing while being spring biased (70) towards the housing.

Claims

1. An electronic module and integrally mounted latch assembly disposed in a housing, the electronic module including an enabling switch, the electronic module latch assembly comprising:

a U-shaped handle having a first leg, a second leg and a bight connecting the first and second legs, the first and second legs secured to the module, the handle defining a handle plane;

a lever having a latch end and a catch end, the latch end pivotally secured to the handle for pivotal movement in latching and unlatching rotary directions along the handle plane between a latched position, generally parallel to the bight, and an unlatched position, extending away from the bight, the lever sized so that the latch end is adjacent the first leg when the lever is in the latched position;

a catch button having a first catch, facing the catch end, movably mounted to the handle for movement between engaged and disengaged positions;

the catch end including a second catch configured for mating engagement with the first catch when the first catch is in the engaged position and the lever is in the latched position so to prevent movement of the lever in the unlatching direction;

a keeper, having a latch surface, mounted to the housing;

the latch end of the lever including latch means for engaging the latch surface to pull the module into and force the module from the housing when the lever is rotated in the latching and unlatching directions, respectively; and

a spring biased disenable switch element movably mounted to the handle to engage the lever so to move between enable and disenable positions as the lever is moved between the latched and unlatched positions, respectively, the disenable switch element sized to extend to the enable switch to actuate the enable switch carried by the module only when the switch element is in the enable position.

2. The electronic module and integrally mounted latch assembly of claim 1 wherein the bight of the handle includes a slot for at least partially housing the lever when the lever is in the latched position.

3. The electronic module and integrally mounted latch assembly of claim 1 wherein the first leg includes an open interior region within which at least a portion of the catch button is housed.

4. The electronic module and integrally mounted latch assembly of claim 1 wherein the disenable switch element includes an elongate pin having an outer end positioned to engage a lower surface of the lever.

5. The electronic module and integrally mounted latch assembly of claim 1 wherein the catch button is a spring biased catch button biased towards the engaged position.

6. The electronic module and integrally mounted latch assembly of claim 1 wherein the latch means includes a U-shaped internal surface configured to engage the latch surface of the keeper.

7. The electronic module and integrally mounted latch assembly of claim 1 wherein the keeper is generally U-shaped.

8. The electronic module and integrally mounted latch assembly of claim 1 wherein the keeper includes means for resiliently mounting the latch surface to the housing.

9. The electronic module and integrally mounted latch assembly of claim 1 wherein the latch end of the lever is pivotally secured to the second leg of the handle.

10. An electronic module and integrally mounted latch assembly disposed in a housing, the electronic module including an enabling switch, the electronic module latch assembly comprising:

an enable switch housed within the electric module;

a U-shaped handle having a first leg, a second leg and a bight connecting the first and second legs, the first and second legs secured to the module, the handle defining a handle plane;

a lever having a lower surface, latch end and a catch end, the latch end pivotally secured to the handle for pivotal movement in latching and unlatching rotary directions along the handle plane between a latched position, generally parallel to the bight, and an unlatched position, extending away from the bight, the lever sized so that the latch end is adjacent the first leg when the lever is in the latched position;

a catch button having a first catch, facing the catch end, movably mounted to the handle for movement between engaged and disengaged positions;

the catch end including a second catch configured for mating engagement with the first catch when the first catch is in the engaged position and the lever is in the latched position so to prevent movement of the lever in the unlatching direction;

a keeper, having a latch surface, mounted to the housing;

means for biasing the latch surface towards the housing;

the latch end of the lever including latch means for engaging the latch surface to pull the module into and force the module from the housing when the lever is rotated in the latching and unlatching directions, respectively; and

a spring biased elongate pin, including outer and inner ends, movably mounted to the handle so the outer end engages the lower surface of the lever so to move between the latched and unlatched positions, respectively, the elongate pin housed within the handle and sized so the inner end extends into the module to actuate the enable switch carried by the module only when the elongate pin is in the enable position.