Sealing assembly for a moveable shaft and switch having same |
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申请号 | US11505098 | 申请日 | 2006-08-16 | 公开(公告)号 | US20080041707A1 | 公开(公告)日 | 2008-02-21 |
申请人 | Davin R. Lee; | 发明人 | Davin R. Lee; | ||||
摘要 | A sealing assembly for a moveable shaft is provided. The sealing assembly includes a housing with a recess disposed therein. A resilient member with an inner diameter and an outer diameter is provided that is disposed within the recess. The outer diameter of the resilient member is greater than an inner diameter of the recess which provides an interference fit between the resilient member and the recess in order to compressingly engage the resilient member with the recess and hold the resilient member within the recess. An outer diameter of the moveable shaft is greater than the inner diameter of the resilient member which provides an interference fit between the moveable shaft and the resilient member in order to compressingly engage the resilient member with the moveable shaft. A switch having a sealing assembly for a moveable shaft is also provided. | ||||||
权利要求 | What is claimed is: |
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说明书全文 | This invention generally relates to a sealing assembly for a moveable shaft. The invention also relates to a switch having a sealing assembly for a moveable shaft. Moveable shafts that are operable between a plurality of positions in an apparatus often require the use of an O-ring or other suitable sealing member around the moveable shaft to prevent debris or dirt from entering a portion of the apparatus that may contain, by way of example and not limitation, contacts or other mechanism for providing an electrical connection. The problem with the O-ring is that it has a relatively small cross section (i.e., circular when cut through one portion thereof) that can cause a loss of sealing if the moveable shaft is moved. For example, the O-ring or other suitable sealing member remains stationary as the moveable shaft is moved thereby allowing debris or dirt to enter the portion of the apparatus through a gap formed between the moveable shaft and O-ring or other suitable sealing member. In other words, the inner diameter of the O-ring does not flex in one axial direction or in the opposite axial direction in order to provide an interference fit between the entire circumference of the inner diameter of the O-ring and the moveable shaft responsive to movement of the moveable shaft. As can be appreciated, this type of seal has the potential of failing in dirty or dusty environments. Other variations of sealing members for moveable shafts exist although there is still room for improvement in maintaining the interference fit between a sealing member and the moveable shaft responsive to movement of the moveable shaft. Accordingly, there is room for improvement in a sealing assembly for a moveable shaft. There is also room for improvement in a switch having a sealing assembly for a moveable shaft. It is an object of the invention to provide a sealing assembly that provides an interference fit between a sealing member and a moveable shaft. It is another object of the invention to provide a sealing assembly that maintains an interference fit between a sealing member and a moveable shaft responsive to movement of the moveable shaft. It is another object of the invention to provide a switch that has a sealing member with an interference fit between the sealing member and a moveable shaft in the switch. It is another object of the invention to provide a switch that has a sealing member with an interference fit between the sealing member and a moveable shaft responsive to movement of the moveable shaft. As one aspect of the invention, a sealing assembly for a moveable shaft is provided that has an outer diameter. The sealing assembly includes a housing with a recess disposed therein. The recess has an inner diameter and an outer diameter. The housing has an outer diameter. A resilient member is provided that is disposed within the recess. The resilient member has an inner diameter and an outer diameter. The outer diameter of the moveable shaft is greater than the inner diameter of the resilient member which is structured to provide an interference fit between the moveable shaft and the resilient member in order to compressingly engage the resilient member with the moveable shaft. The outer diameter of the resilient member is greater than the inner diameter of the recess which is structured to provide an interference fit between the outer diameter of the resilient member and the inner diameter of the recess in order to compressingly engage the resilient member with the recess and hold the resilient member within the recess. The outer diameter of the recess is substantially less than the outer diameter of the housing. As another aspect of the invention, a sealing assembly for a moveable shaft is provided. The sealing assembly includes a housing with a recess disposed therein. A resilient member is provided that is disposed within the recess. The resilient member has an aperture and an annular groove formed therein which defines a connector segment connected to a plurality of proximate nodes. The proximate nodes have a thickness and the connector segment has a thickness less than the thickness of the proximate nodes. The aperture of the resilient member is structured to have the moveable shaft pass through the aperture. As another aspect of the invention, a switch is provided. The switch includes a housing with an opening, a cavity and a recess disposed therein. The recess has an inner diameter and an outer diameter. The housing has an outer diameter. A base is provided having contacts extending into the cavity with the base being coupled to the housing. A moveable shaft is provided having an outer diameter. The moveable shaft is operable between a plurality of positions and has a first end and a second end. The first end of the moveable shaft is disposed at the opening of the housing. The second end of the moveable shaft extends into the cavity of the housing toward the base. A resilient member is disposed within the recess with the resilient member having an inner diameter and an outer diameter. The outer diameter of the moveable shaft is greater than the inner diameter of the resilient member which is structured to provide an interference fit between the moveable shaft and the resilient member in order to compressingly engage the resilient member with the moveable shaft. The outer diameter of the resilient member is greater than the inner diameter of the recess which is structured to provide an interference fit between the outer diameter of the resilient member and the inner diameter of the recess in order to compressingly engage the resilient member with the recess and hold the resilient member within the recess. The outer diameter of the recess is substantially less than the outer diameter of the housing. The moveable shaft is structured to be activated by a user to establish an electrical connection responsive to movement of the moveable shaft. A full understanding of the invention can be gained from the following description of the preferred embodiments when read in conjunction with the accompanying drawings in which: For purposes of the description hereinafter, the terms “upper”, “lower”, “vertical”, “horizontal”. “top”, “bottom”, “aft”, “behind”, “forward”, “rear”, “beneath”, “below” and derivatives thereof shall relate to the structures as oriented in the drawings. However, it is to be understood that the invention may assume various alternative configurations except where expressly specified to the contrary. It is also to be understood that the specific elements illustrated in the drawings and described in the following specification are simply example embodiments of the invention. Therefore, specific dimensions, orientations and other physical characteristics related to the embodiments disclosed herein are not to be considered limiting. As employed herein, the statement that two or more parts are “coupled”, “attached” or “connected” means that the parts are joined together either directly or joined indirectly through one or more intermediate parts. Turning to an embodiment of the invention shown in A resilient member 26 is disposed with the recess 18. With reference to The outer diameter 30 of the resilient member 26 is greater than the inner diameter 20 of the recess 18 which provides an interference fit between the outer diameter 30 of the resilient member 26 and the inner diameter 20 of the recess 18 in order to compressingly engage the resilient member 26 with the recess 18 and hold the resilient member 26 within the recess 18. The interference fit between the recess 18 and the resilient member 26 may additionally assist in compressingly engaging the resilient member 26 with the moveable shaft 12. The outer diameter 22 of the recess 18 is substantially less than the outer diameter 24 of the housing 16. The housing 16 is structured to receive a retainment member 31 located proximate to the recess 18 and the resilient member 26 which retainment member 31 holds the resilient member 26 in place. By way of example and not limitation, retainment member 31 could be a disc, a flat washer, a keyed washer, a lock washer, a serrated washer, another suitable washer, an elastomeric member, a resilient member, a shim, a spacer or other suitable retainment mechanism or device. The sealing assembly 10 may be contained within a switch 32 as shown in The housing 16 has a first portion 46 and a second portion 48. The resilient member 26 situated within the recess 18 keeps contaminants such as, for example, debris, dirt or dust from entering the second portion 48 from the first portion 46. The second portion 48 contains the contacts 40 that are structured to establish an electrical connection responsive to movement of the moveable shaft 12 (see With reference to The nodes 56 have a thickness 62 and the connector segment 54 has a thickness 64 less than the thickness 62 of the proximate nodes 56. The recess 18 has a height 66 generally equal to the thickness 62 of the proximate nodes 56 with the nodes 56 seating snug within the recess 18. An aperture 68 passing through the resilient member 26 has an hourglass like appearance in cross-section. The moveable shaft 12 passes through the aperture 68 of the resilient member 26. Turning to another embodiment of the invention shown in A resilient member 126 is disposed with the recess 118. With reference to The outer diameter 130 of the resilient member 126 is greater than the inner diameter 120 of the recess 118 which provides an interference fit between the outer diameter 130 of the resilient member 126 and the inner diameter 120 of the recess 118 in order to compressingly engage the resilient member 126 with the recess 118 and hold the resilient member 126 within the recess 118. The interference fit between the recess 118 and the resilient member 126 may additionally assist in compressingly engaging the resilient member 126 with the moveable shaft 112. The outer diameter 122 of the recess 118 is substantially less than the outer diameter 124 of the housing 116. The housing 116 is structured to receive a retainment member 131 located proximate to the recess 118 and the resilient member 126 which retainment member 131 holds the resilient member 126 in place. By way of example and not limitation, retainment member 131 could be a disc, a flat washer, a keyed washer, a lock washer, a serrated washer, another suitable washer, an elastomeric member, a resilient member, a shim, a spacer or other suitable retainment mechanism or device. The sealing assembly 110 may be contained within a switch 132 as shown in The housing 116 has a first portion 146 and a second portion 148. The resilient member 126 situated within the recess 118 keeps contaminants such as, for example, debris, dirt or dust from entering the second portion 148 from the first portion 146. The second portion 148 contains contacts 140 that are structured to establish an electrical connection responsive to movement of the moveable shaft 112 ( With reference to While specific embodiments of the invention have been described in detail, it will be appreciated by those skilled in the art that various modifications and alternatives to those details could be developed in light of the overall teachings of the disclosure. Accordingly, the particular arrangements disclosed are meant to be illustrative only and not limiting as to the scope of the invention which is to be given the full breadth of the claims appended hereto and any and all equivalents thereto. |