Door locking mechanism

• US 7,959,196 B2
• Filed: 10/27/2008
• Issued: 06/14/2011
• Est. Priority Date: 10/30/2003
• Status: Active Grant

• Current Assignee: Deka Products Limited Partnership
• Original Assignee: Deka Products Limited Partnership
• Inventors: Dale, James D.
• Primary Examiner(s): Lugo; Carlos
• Application Number:
  US12/258,823
• Publication Number:
  US 20090115199A1
• Time in Patent Office: 960 Days
• Field of Search: 292/95, 292/303
• US Class Current: 292/303
• CPC Class Codes: A61L 2/0088 Liquid substances
• CPC Class Codes: A61L 2/24 Apparatus using programmed or automatic operation
• CPC Class Codes: A61M 1/0213 with isolated sections of the tube used as additive reservoirs
• CPC Class Codes: A61M 1/0272 Apparatus for treatment of blood or blood constituents prior to or for conservation, e.g. freezing, drying or centrifuging
• CPC Class Codes: A61M 1/0281 Apparatus for treatment of blood or blood constituents prior to transfusion, e.g. washing, filtering or thawing
• CPC Class Codes: A61M 1/36225 with blood pumping means or components thereof
• CPC Class Codes: A61M 1/3687 Chemical treatment A61M1/3675 takes precedence
• CPC Class Codes: A61M 2205/125 with incorporated filters
• CPC Class Codes: B01F 23/451 by injecting one liquid into another
• CPC Class Codes: B01F 23/49 Mixing systems, i.e. flow charts or diagrams
• CPC Class Codes: B01F 25/105 Mixing heads, i.e. compact mixing units or modules, using mixing valves for feeding and mixing at least two components
• CPC Class Codes: B01F 25/60 Pump mixers, i.e. mixing within a pump
• CPC Class Codes: B01F 33/81 Combinations of similar mixers, e.g. with rotary stirring devices in two or more receptacles
• CPC Class Codes: B01F 33/811 in two or more consecutive, i.e. successive, mixing receptacles or being consecutively arranged
• CPC Class Codes: B01F 35/711 for feeding a mixture of components, i.e. solids in liquid, solids in a gas stream
• CPC Class Codes: B01F 35/715 Feeding the components in several steps, e.g. successive steps
• CPC Class Codes: B01F 35/8823 using diaphragms or bellows
• CPC Class Codes: F04B 13/02 of two or more fluids at the same time
• CPC Class Codes: F04B 23/02 having reservoirs
• CPC Class Codes: F04B 23/06 the pumps being all of reciprocating positive-displacement type
• CPC Class Codes: F04B 43/0009 : Special features
• CPC Class Codes: F04B 43/06 : Pumps having fluid drive
• CPC Class Codes: F04B 49/22 : by means of valves F04B49/03 takes precedence
• CPC Class Codes: F04B 53/06 : Venting
• CPC Class Codes: F04B 53/16 : Casings; Cylinders; Cylinder liners or heads; Fluid connections
• CPC Class Codes: F04B 53/22 : Arrangements for enabling ready assembly or disassembly
• CPC Class Codes: G05D 11/132 : by controlling the flow of the individual components G05D11/133 takes precedence
• CPC Class Codes: Y02A 50/30 : Against vector-borne diseases, e.g. mosquito-borne, fly-borne, tick-borne or waterborne diseases whose impact is exacerbated by climate change
• CPC Class Codes: Y10T 137/0329 : Mixing of plural fluids of diverse characteristics or conditions
• CPC Class Codes: Y10T 137/0352 : Controlled by pressure
• CPC Class Codes: Y10T 137/86131 : Plural
• CPC Class Codes: Y10T 137/87652 : With means to promote mixing or combining of plural fluids
• CPC Class Codes: Y10T 29/53 : Means to assemble or disassemble
• CPC Class Codes: Y10T 292/0911 : Hooked end
• CPC Class Codes: Y10T 292/212 : With expanding or contracting means
• CPC Class Codes: Y10T 292/438 : Spring-arm catch

Abstract

A system and method for locking a door. An assembly has a first engagement surface. A door is coupled to the assembly, the door including a latch member having a second engagement surface for engaging the first engagement surface. A movable member is capable of generating a force against at least one of the assembly and the door to press together and substantially prevent disengagement of the first engagement surface and the second engagement surface.

Claims

1. A door locking system comprising:

an assembly facing an inside surface of an attached door, and including a latching structure, the latching structure defining a recess facing away from the inside surface of the door when the door is in a closed position;

a force-generating member coupled to the door for applying a force against the assembly to urge the door to an open position; and

a latch member movably connected to the door for engagement with the latching structure to keep the door closed, the latch member comprising;

a distal coupling element adapted and configured to fit within the recess of the latching structure; and

a proximal connecting element adapted and configured to connect to a handle on the door, wherein actuation of the handle moves the distal coupling element into or out of alignment with the latching structure;

wherein

application of the force creates an engagement force between the latching structure of the assembly and the latch member of the door to keep the door latched, and release of the force decreases the engagement force, allowing disengagement of the latch member from the latching structure when the handle is actuated.

2. The door locking system of claim 1, wherein the force-generating member is coupled to the inside surface of the door, and the force is applied between the inside surface of the door and a cassette within the assembly.

3. The door locking system of claim 2, wherein the force-generating member comprises a piston for applying a force against the cassette.

4. The door locking system of claim 3, wherein the force-generating member further comprises an expandable bladder acting on the piston.

5. The door locking system of claim 2, wherein the cassette comprises a pump cassette.

6. The door locking system of claim 1, wherein the latch member is under an elastic force urging the distal latching end into alignment with the latching structure.

7. The door locking system of claim 6, wherein the elastic force is provided by a spring.

8. A door locking system comprising:

an assembly facing an inside surface of an attached door, and including a latching structure;

a force-generating member coupled to the door for applying a force against the assembly to urge the door to an open position; and

a latch member movably connected to the door for engagement with the latching structure to keep the door closed, the latch member comprising;

a distal coupling element defining a recess facing the inside surface of the door, a component of the latching structure being adapted and configured to fit within the recess of the latch member; and

a proximal connecting element adapted and configured to connect to a handle on the door, wherein actuation of the handle moves the distal coupling element into or out of alignment with the latching structure;

wherein

application of the force creates an engagement force between the latching structure of the assembly and the latch member of the door to keep the door latched, and release of the force decreases the engagement force, allowing disengagement of the latch member from the latching structure when the handle is actuated.

9. The door locking system of claim 8, wherein the force-generating member is coupled to the inside surface of the door, and the force is applied between the inside surface of the door and a cassette within the assembly.

10. The door locking system of claim 9, wherein the force-generating member comprises a piston for applying a force against the cassette.

11. The door locking system of claim 10, wherein the force-generating member further comprises an expandable bladder acting on the piston.

12. The door locking system of claim 9, wherein the cassette comprises a pump cassette.

13. The door locking system of claim 8, wherein the latch member is under an elastic force urging the distal latching end into alignment with the latching structure.

14. The door locking system of claim 13, wherein the elastic force is provided by a spring.