Lateral compression sealing system and method of making seal

• US 5,050,764 A
• Filed: 03/08/1990
• Issued: 09/24/1991
• Est. Priority Date: 03/08/1990
• Status: Expired due to Fees

• Current Assignee: Medtronic Minimed Incorporated (Medtronic Plc)
• Original Assignee: Pacesetter Incorporated (Abbott Laboratories Incorporated)
• Inventors: Voss, Laveille K.
• Primary Examiner(s): Marcus, Stephen
• Assistant Examiner(s): Cronin, Stephen K.
• Application Number:
  US07/490,219
• Time in Patent Office: 565 Days
• Field of Search: 220/378, 220/357, 220/358, 220/324, 220/327, 220/4.21, 277/205, 277/180, 277/181, 277/189
• US Class Current: 220/378
• CPC Class Codes: F16J 15/062 characterised by the geometry of the seat

Abstract

A system for sealing a case with a lid and method of forming a seal generally comprises a raised edge on the case, a shaped channel in the lid and a cross-sectionally shaped gasket that is laterally compressed by the side walls of the channel and seals the lid and case between the side walls of the channel and the case raised edge.

Claims

1. A housing assembly comprising:

a first housing member defining a case having a chamber therein, said first housing member having a projecting seal receiving portion comprising a raised portion of said first housing member;

a second housing member defining a lid for said case, said second housing member having a recessed seal receiving portion, said recessed portion having generally sloped sides; and

a gasket having a receiving slot and at least partially sloped sides, said gasket being mounted on said first housing member with said projecting portion extending into said slot and, said second housing member being connected to said first housing member with said gasket and said projecting portion being received in said recessed portion wherein said recessed portion sloped sides laterally compress said gasket therebetween and seal said first housing member with said second housing member, and wherein said gasket is a closed loop for forming a sealed chamber in said case and said lid.

2. An assembly as defined in claim 1 wherein said first housing member raised portion is comprised of a substantially box shaped raised edge.

3. An assembly as defined in claim 1 wherein said slot and said raised portion are substantially the same size.

4. An assembly as defined in claim 1 wherein said gasket sides have compound pitch slopes at a non-deformed position.

5. An assembly as defined in claim 4 wherein said gasket side slopes change pitch on said gasket sides at about the same location as the top of the receiving slot.

6. An assembly as defined in claim 1 wherein said gasket sides are convexly curved.

7. An assembly as defined in claim 1 wherein said recessed portion sloped sides have a pitch of about 5 to 15 degrees.

8. An assembly as defined in claim 1 wherein said gasket sloped sides have a first portion with a slope of about 25 degrees and a second portion that is substantially vertical.

9. A housing assembly comprising:

a first housing with a projecting seal receiving portion comprising a raised portion of said first housing;

a second housing with a recessed seal receiving portion, said recessed portion having generally sloped sides; and

a gasket having a receiving slot and at least partially sloped sides, wherein said sloped sides of said gasket have a first portion with a slope of between 10 and 35 degrees and a second portion that is substantially vertical, said gasket being mounted on said first housing with said projecting portion extending into said slot and, said second housing being connected to said first housing with said gasket and said projecting portion being received in said recessed portion wherein said recessed portion sloped sides laterally compress said gasket therebetween and seal said first housing with said second housing.

10. A housing assembly as defined in claim 9, wherein said first portions of said sloped sides of said gasket have a slope of about 25 degrees.

11. A housing assembly comprising:

a first housing with a projecting seal receiving portion comprising a raised portion of said first housing;

a second housing with a recessed seal receiving portion, said recessed portion having generally sloped sides; and

a gasket having a receiving slot and at least partially sloped, convexly curved sides, said gasket being mounted on said first housing with said projecting portion extending into said slot and, said second housing being connected to said first housing with said gasket and said projecting portion being received in said recessed portion wherein said recessed portion sloped sides laterally compress said gasket therebetween and seal said first housing with said second housing.

12. A system of sealing a first member with a second member comprising:

a gasket having a slot extending thereinto, said gasket having two sides each having a first portion which is sloped and a second portion which is unsloped, the second portions of said sides being essentially parallel;

means for mounting said gasket to said first member comprising a ridge projection extending along a surface of said first member, said projection being suitably sized and shaped to be received in said slot; and

means for forming a seal between said first and second members comprising a cavity extending along a surface of said second member and having tapered side walls, said cavity receiving said gasket and said projection therein and laterally compressing said gasket along its entire length between said side walls to form a seal between said side walls and said projection.

13. A system as defined in claim 12 further comprising means to hold said first and second members together.

14. A system as defined in claim 12 wherein said means for forming a seal comprises said gasket, said projection and said cavity being suitably shaped such that said gasket lateral compression is relatively larger than gasket vertical compression.

15. A system as defined in claim 12 wherein said gasket is comprised of silicone.

16. A system as defined in claim 12 wherein said gasket has a substantially flat top section over said cavity which is not substantially compressed between said first and second members.

17. A sealing structure including a gasket, the sealing structure comprising:

a first member with a projecting edge portion;

a second member with a recessed channel;

a gasket comprising;

a bottom gasket portion having a slot therein and nontapered, essentially parallel outer side walls, said slot extending into the bottom gasket portion at a depth of at least about one-third of the height of the gasket, said slot being substantially the same size and shape as said projecting edge portion such that the gasket can be mounted to said first member with said projecting edge portion being received in said slot; and

a top gasket portion having tapered outer side walls with a relatively small top width and a relatively large bottom width, said top width being smaller than an opening mouth of the second member channel and said top portion bottom width being at least as large as the opening mouth of the second member channel such that as the top gasket portion with said projecting edge portion therein is inserted into the second member channel, lateral forces from compression of the gasket between the projecting edge portion and sides of the channel inwardly deform the sides of the top and bottom gasket portions and seal the sides of the channel with the projecting edge portion.

18. A method of forming a seal between a first housing member and a second housing member comprising the steps of:

providing a gasket with a slot extending into a bottom thereof;

mounting said gasket on said first housing member, said first housing member defining a case having a chamber therein, said first housing member having a projecting edge portion wherein said projecting edge portion is received in said gasket slot; and

mounting said second housing member to said first housing member with said gasket at least partially therebetween, said second housing member defining a lid for said case, said second housing member having a channel with sloped side walls such that said gasket and said projecting edge portion can extend into said channel with said sloped side walls laterally wedging said gasket therebetween to seal said second housing member with said first housing member projecting edge portion, wherein said gasket is a closed loop for forming a sealed chamber in said case and said lid.

19. A method as defined in claim 18 further comprising the step of fixing the first and second housings together by the use of fasteners.