• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A self-tightening clip having a planar member and at least one retention member attached to the planar member. The planar member includes an inner perimeter, an outer perimeter, and defines a central axis. The least one retention member including a planar leg portion and a planar hook portion. The leg portion extends from the inner perimeter in a first direction along the central axis. The hook portion projects from the leg portion toward the central axis in a second direction, which is opposite the first direction along the central axis. The hook portion is acute to the central axis and has a free end located on an imaginary perimeter concentric to the inner perimeter of the planar member. The central axis and a plane passing through the hook portion of the at least one retention member form an angle in the range of approximately 20°-30°.
    公开号:US20010004434A1
    申请号:US09/770,981
    申请日:2001-01-26
    公开日:2001-06-21
    发明作者:Jason Kilgore
    申请人:Siemens Automotive Corp；
    IPC主号:F16B2-241
    专利说明:
    [0001] This invention relates to a device that secures a first housing to a second housing. In particular, the present invention relates to a unitary sheet metal clip that self-tightens on a retained housing when the retained housing is displaced. [0001] SUMMARY OF THE INVENTION
    [0002] The present invention provides a clip having a planar member and at least one retention member attached to the planar member. The planar member includes an inner perimeter, an outer perimeter, and defines a central axis. The least one retention member including a planar leg portion and a planar hook portion. The arrangement of the leg portion and the hook portion of the retention member create the self-tightening feature of the inventive clip. [0002]
    [0003] The leg portion extends from the inner perimeter in a first direction along the central axis. The hook portion projects from the leg portion toward the central axis in a second direction, which is opposite the first direction along the central axis. The hook portion is acute to the central axis and has a free end located on an imaginary perimeter concentric to the inner perimeter of the planar member. The central axis and a plane passing through the hook portion of the at least one retention member form an angle in the range of approximately 20°-30°. Preferably, the angle comprises approximately 24°. [0003]
    [0004] In a preferred embodiment of the invention, the planar member comprises an annulus, the imaginary perimeter comprises a circle, and the at least one retention member comprises a plurality of retention members. Particularly, five retention members uniformly disposed about the inner perimeter of the planar annulus. [0004]
    [0005] The preferred embodiment further comprises a plurality of stiffeners. At least one of the plurality of stiffeners is disposed on the inner perimeter between two of the plurality of retention members. Each of the plurality of stiffeners comprises a lip extending in the engaging direction. [0005]
    [0006] The present invention also provides a sheet metal clip for securing a first generally cylindrical housing member to a second generally cylindrical housing. The clip comprises a planar annulus, a plurality of retention members and a plurality of stiffeners. [0006]
    [0007] The planar annulus includes an inner perimeter, an outer perimeter, and defines a central axis. The plurality of retention members are uniformly disposed about the inner perimeter of the planar annulus. The plurality of stiffeners are arranged so that at least one of the plurality of stiffeners is disposed on the inner perimeter between two adjacent retention members of the plurality of retention members. [0007]
    [0008] Each of the plurality of retention members includes a leg portion, a hook portion, and an arcuate portion disposed between the leg portion and the hook portion. The leg portion extends in an engaging direction and is substantially parallel to the central axis. The hook portion projects from the leg portion so that the central axis and a plane that passes through the hook portion form an angle in the range of approximately 20°-30°. The hook portion has a free end positioned on an imaginary circle concentric to the inner perimeter of the planar annulus. [0008]
    [0009] The present invention also provides a method of retaining a first generally cylindrical housing to a second generally cylindrical housing while allowing for relative rotation between the cylindrical housings. The method comprises: (1) providing a sheet metal clip having an annulus and a plurality of retention members, each of the plurality of retention members including a leg portion and a hook portion, the leg portion extending from an inner perimeter of the annulus, the hook portion projecting from the leg portion toward a central axis of the annulus, the hook portion being acute to the central axis; (2) positioning the annulus of the clip within a retaining portion of the first housing member; and (3) locating the first housing member proximate the second housing member so that a free end of the hook portion of each of the retention members engages a protrusion on the second housing. [0009]
    [0010] The present invention further provides a method of stamping a clip, which retains a first generally cylindrical housing to a second generally cylindrical housing. The method of stamping comprises: (1) punching a sheet metal circular configuration, the circular configuration having an interior cutout so that a plurality of substantially trapezoidal sheet metal members extending toward the central axis of the circular configuration; and (2) forming each of the plurality of substantially trapezoidal sheet metal members into a retention members having a planar leg portion and a planar hook portion, the planar leg portion extending from an inner perimeter of an planar annulus created from the circular configuration, the planar hook portion projecting from the planar leg portion toward the central axis of the circular configuration, the planar hook portion being acute to the central axis. [0010] BRIEF DESCRIPTION OF THE DRAWINGS
    [0011] The accompanying drawings, which are incorporated herein and constitute part of this specification, illustrate presently preferred embodiments of the invention, and, together with a general description given above and the detailed description of the preferred embodiments given below, serve to explain the principles of the invention. [0011]
    [0012] FIG. 1 is a partial cross sectional perspective view of the clip of the present invention securing a first housing to a second housing; [0012]
    [0013] FIG. 2 is a top view of the clip of the present invention; [0013]
    [0014] FIG. 3 is a cross sectional view of the clip shown in FIG. 2 taken along the line [0014] 3-3 in FIG. 2;
    [0015] FIG. 4 is a top view of the sheet metal configuration use to form the clip of the present invention. [0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT(S)
    [0016] FIG. 1 shows the sheet metal clip [0016] 10 for securing a first housing 12 to a second housing 14 of the preferred embodiment. The first housing 12 and the second housing 14 are, preferably, generally cylindrical housing members, however, it is to be understood that other configurations could be employed depending on the particular intended application.
    [0017] As shown in FIGS. [0017] 1-3, the clip 10 of the present invention comprises a planar member 16 and at least one retention member 18 attached to the planar member 16. The planar member 16 is held in place by the first housing 12 so that the retention member 18 can engage a portion of the second housing 14 to secure the housings together.
    [0018] The planar member [0018] 16 includes an inner perimeter 20, an outer perimeter 22, and defines a central axis 24. The planar member 16 is preferably a planar annulus with a geometric configuration, such as, for example, square, rectangle, oval, circle, which is selected to correspond to the employed housing configuration. In the preferred embodiment planar member 16 comprises a planar annulus with a circle configuration.
    [0019] The circular annulus [0019] 16 a has an inner circular perimeter 20 a concentric to an outer circular perimeter 22 a. A planar support surface 26 is disposed between the inner and outer perimeters 20, 22.
    [0020] The at least one retention member [0020] 18 attached to the planar annulus 16, preferably, comprises a plurality of retention members 18 uniformly disposed about the inner perimeter 20 of the planar annulus, more particularly, five retention members 18. The clip 10 of the preferred embodiment further includes a plurality of stiffeners 28 attached to the planar member 16 with at least one stiffener between two of the plurality of retention members 18.
    [0021] In the preferred embodiment the planar member [0021] 16, the plurality of retention members 18, and the plurality of stiffeners 28 comprise a unitary sheet of metal. That is, the clip 10 of the present invention is, preferably, made from sheet metal.
    [0022] Each of the plurality of retention members includes a leg portion [0022] 30, a hook portion 32, and an arcuate portion 34 disposed between the leg portion 30 and hook portion 32. The leg portion 30 and the hook portion 32 are, preferably, also planar and are formed from a bent substantially trapezoidal configuration, as discussed below in reference to FIG. 4.
    [0023] The leg portion [0023] 30 extends from the inner perimeter 20 of the annulus in a first direction 36 along the central axis 24. The leg portion 30 is substantially parallel to the central axis 24. The first direction 36 defines an engaging direction. That is, the direction the retention members 18 are moved so that the clip 10 of the present invention, which is supported by the first housing, engages the second housing 14.
    [0024] The hook portion [0024] 32 projects from the leg portion 30 toward the central axis 24 in a second direction 38. The second direction 38 is generally opposite the first direction 36 along the central axis 24. The hook portion 32 projects from the leg portion 30 so that the central axis 24 and a plane (P shown in FIG. 3) passing through the hook portion 32 form an angle in the range of approximately 20°-30°. Preferably, the angle comprises approximately 24°.
    [0025] The hook portion [0025] 32 of each of the plurality of retention members includes a free end 40 located on an imaginary perimeter 42 concentric to the inner perimeter 20 of the planar member 16. Because in the preferred embodiment of the invention the planar member 16 comprises an annulus with a circular inner perimeter 20 a, the imaginary perimeter 42 of the preferred embodiment also comprises a circle. The free end 40 of the hook portion 32 is positioned to provide face 44. The face 44 provides a bearing surface that engages the protrusion 46 of the second housing 14 member.
    [0026] By providing each of the free ends [0026] 40 of each of the hook portions 32 on the imaginary perimeter 42 that corresponds to the selected inner perimeter 20 of the planar member 16, the clip 10 is self-tightening once installed in a housing-retaining position. More particularly, in the preferred embodiment of the invention, the free ends 40 of the respective hook portions 32 of the plurality of the retaining members are uniformly disposed about the imaginary perimeter 42. This uniform dispersion of the free ends 40 about the imaginary perimeter 42 applies a balanced retaining force to the engaged (second) housing that increases as the annulus of the clip 10 is axially displaced in the non-engaging direction or the annulus of the clip 10 is maintained in a stationary location while the engaged housing is axially moved in the engaging direction. The applied force is also believed to increase because of the unique relationship between the hook portion 32 and the leg portion 30 of each of the retention members.
    [0027] Even though it is believed that the self-tightening feature of the preferred embodiment is best achieved by having a plurality of retention members uniformly dispersed about the planar annulus, the self-tightening feature of the clip [0027] 10 could also be achieved with a single retention member. A single retention member, however, allows for the first housing 12 to be removed from the second housing 14 by rocking the second housing 14 about the central axis 24 so that the single retention member disengages from the second housing 14. To overcome the removablilty of the first housing from the second housing 14 when a single retention member is employed, two retention members disposed at approximately opposite positions on the inner perimeter 20 could be employed. In order to ensure that the first housing 12 is secured to the second housing 14 so that removal by rocking the first housing 12 is prevented, a clip 10 with three uniformly disposed retention members could be employed.
    [0028] As shown in FIGS. [0028] 1-3, the free end 40 of the hook portion 32 is disposed at approximately a third of the distance the leg portion 30 extends from the planar annulus in the engaging direction. Also, each of the leg portions 30 and the hook portions 32 is, preferably, substantially planar members. Because of the dimensioning and configuration of the hook portion 32, it is believed that during loading of the retention member along the central axis 24 opposite the engaging direction, the hook portion 32 acts as a short column that pushes the hook supporting end of the leg portion 30 away from the central axis 24. While the hook supporting end of the leg portion 30 of the retaining member is pushed away from the central axis 24, due to the elastic quality of the sheet metal used to form the preferred clip 10, it is believed that the loading force is substantially applied to the hook portion 32 of the retaining member until plastic or sheering deformation of the leg portion 30 of the retaining member or the protrusion 46 on the second housing 14. Instron pull testing of the preferred embodiment of the invention (inner perimeter 20 approximately 21 mm, outer perimeter 22 approximately 27 mm, leg portion 30 approximately 4.25 mm, and hook portion 32 approximately 2.8 mm) has confirmed that the retention ability of the clip 10 of the preferred embodiment continues to increase until catastrophic failure of the leg portion 30 or the second housing 14 occurs at approximately 700 psi.
    [0029] The plurality of stiffeners [0029] 28 attached to the inner perimeter 20 of the planar member 16, annulus, increase the structural rigidity of the unitary sheet metal clip 10 of the present invention. At least one of the plurality of stiffeners 28 is disposed on the inner perimeter 20 between two adjacent retention members of the plurality of retention members 18. Preferably, each of the plurality of stiffeners 28 comprises a lip 28 a extending in the engaging direction from the inner perimeter 20 of the planar annulus.
    [0030] A cut-out [0030] 48 is provided on the inner perimeter 20 of the planar annulus between each of the plurality of retention members and each stiffener. The cut-out 48 relieves stress created in the support surface of the planar annulus. The cut-out 48, preferably, is a semicircle formed in the support surface 26 between the leg of the retention member and the lip 28 a, which serves as the stiffener.
    [0031] The present invention also includes a method of retaining a first generally cylindrical housing to a second generally cylindrical housing while allowing for relative rotation between the housings. The method is achieved by providing a sheet metal clip [0031] 10 having an annulus and a plurality of retention members. As discussed above, the preferred sheet metal clip 10 includes five retention members uniformly disposed about the inner perimeter 20 of the annulus, each of the retention members having at least a portion of the free end 40 of their respective hook portion 32 located on an imaginary circle that is concentric to the inner perimeter 20 of the annulus.
    [0032] After the clip [0032] 10 has been provided, the annulus of the clip 10 is positioned within a retaining portion of the first housing 12. Then, the first housing 12 is located proximate the second housing 14 so that the free end 40 of the hook portion 32 of each of the retention members engages a protrusion 46 on the second housing 14.
    [0033] The present invention also provides a method of stamping a clip [0033] 10 for retaining a first generally cylindrical housing to a second generally cylindrical housing. The steps of stamping include punching and forming a single sheet of metal in a uniform sequence of steps. First, a particular configuration is punched from a metal sheet. The preferred configuration is a circular configuration having an open interior so that a plurality of substantially trapezoidal sheet metal members 50 extends toward the central axis 24 of the circular configuration. Once the particular configuration is punched, each of the plurality of substantially trapezoidal sheet metal members 50 is formed into a retention members having a planar leg portion 30 and a planar hook portion 32. The planar leg portion 30 is formed to extend from an inner perimeter 20 of a planar member 16, preferably, a circular annulus 16 a, created from the particular configuration, while the planar hook portion 32 is formed to project from the planar leg portion 30 toward the central axis 24 of the particular configuration.
    [0034] As shown in FIG. 4, the preferred embodiment of the punched configuration before forming provides the interior as a centrally located pentagon [0034] 52 with a generally triangular members 54 extending from each corner of the pentagon. After the preferred embodiment is punched, the geometric configuration is formed so that the planar hook portion 32 is acute to the central axis 24 so that the central axis 24 and a plane passing through the hook portion 32 form an angle in the range of approximately 20°-30°, and a stiffener is located on the inner perimeter 20 between each of the plurality of retention members 18.
    [0035] While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. [0035]
    权利要求:
    Claims (26)
    [1" id="US-20010004434-A1-CLM-00001] 1. A self-tightening clip comprising:
    an planar member including an inner perimeter, an outer perimeter, and defining a central axis; and
    at least one retention member attached to the planar annulus, the at least one retention member including a planar leg portion and a planar hook portion, the leg portion extending from the inner perimeter in a first direction along the central axis, the hook portion projecting from the leg portion toward the central axis in a second direction, opposite the first direction, along the central axis, the hook portion being acute to the central axis and having a free end located on an imaginary perimeter concentric to the inner perimeter of the planar member.
    [2" id="US-20010004434-A1-CLM-00002] 2. The self-tightening clip of
    claim 1 , wherein the planar member comprises an annulus and the imaginary perimeter comprise a circle.
    [3" id="US-20010004434-A1-CLM-00003] 3. The self-tightening clip of
    claim 2 , wherein the at least one retention member comprises a plurality of retention members, each of the plurality of retention members having a leg portion extending in the first direction.
    [4" id="US-20010004434-A1-CLM-00004] 4. The self-tightening clip of
    claim 3 , wherein the leg portion of each of the plurality of retention members is substantially parallel to the central axis.
    [5" id="US-20010004434-A1-CLM-00005] 5. The self-tightening clip of
    claim 3 , wherein each of the plurality of retention members comprises an arcuate portion disposed between the leg portion and the hook portion.
    [6" id="US-20010004434-A1-CLM-00006] 6. The self-tightening clip of
    claim 3 , wherein the plurality of retention members comprises five retention members.
    [7" id="US-20010004434-A1-CLM-00007] 7. The self-tightening clip of
    claim 6 , wherein the five retention members are uniformly disposed about the inner perimeter of the planar annulus.
    [8" id="US-20010004434-A1-CLM-00008] 8. The self-tightening clip of
    claim 3 , further comprising a plurality of stiffeners, at least one of the plurality of stiffeners being disposed on the inner perimeter between two of the plurality of retention members.
    [9" id="US-20010004434-A1-CLM-00009] 9. The self-tightening clip of
    claim 8 , wherein each of the plurality of stiffeners comprises a lip extending in the engaging direction.
    [10" id="US-20010004434-A1-CLM-00010] 10. The self-tightening clip of
    claim 8 , wherein the annulus, the plurality of retention members, and the plurality of stiffeners comprise a unitary sheet of metal.
    [11" id="US-20010004434-A1-CLM-00011] 11. The self-tightening clip of
    claim 1 , wherein the central axis and a plane passing through the hook portion of the at least one retention member form an angle in the range of approximately 20°-30°.
    [12" id="US-20010004434-A1-CLM-00012] 12. The self-tightening clip of
    claim 11 , wherein the angle comprises approximately 24°.
    [13" id="US-20010004434-A1-CLM-00013] 13. A sheet metal clip for securing a first generally cylindrical housing member to a second generally cylindrical housing, the clip comprising:
    a planar annulus including an inner perimeter, an outer perimeter, and defining a central axis;
    a plurality of retention members uniformly disposed about the inner perimeter of the planar annulus, each of the plurality of retention members including a leg portion, a hook portion, and an arcuate portion disposed between the leg portion and hook portion, the leg portion extending in an engaging direction and being substantially parallel to the central axis, the hook portion projecting from the leg portion so that the central axis and a plane passing through the hook portion form an angle in the range of approximately 20°-30°, the hook portion having a free end positioned on an imaginary circle concentric to the inner perimeter of the planar annulus; and
    a plurality of stiffeners, at least one of the plurality of stiffeners being disposed on the inner perimeter between two adjacent retention members of the plurality of retention members.
    [14" id="US-20010004434-A1-CLM-00014] 14. The clip of
    claim 13 , wherein each of the plurality of stiffeners comprises a lip extending in the engaging direction.
    [15" id="US-20010004434-A1-CLM-00015] 15. The clip of
    claim 13 , wherein each of the plurality of retention members comprise a bent substantially trapezoidal configuration.
    [16" id="US-20010004434-A1-CLM-00016] 16. The clip of
    claim 13 , further comprising a cut-out on the inner perimeter of the planar annulus between each of the plurality of retention members and each stiffener.
    [17" id="US-20010004434-A1-CLM-00017] 17. The clip of
    claim 16 , wherein the cut-out comprises a semicircle.
    [18" id="US-20010004434-A1-CLM-00018] 18. The clip of
    claim 13 , wherein the plurality of retention members comprises five retention members uniformly disposed on the inner perimeter.
    [19" id="US-20010004434-A1-CLM-00019] 19. The clip of
    claim 13 , wherein the angle comprises approximately 24°.
    [20" id="US-20010004434-A1-CLM-00020] 20. A method of retaining a first generally cylindrical housing to a second generally cylindrical housing while allowing for relative rotation between the housings, comprising:
    providing a sheet metal clip having an annulus and a plurality of retention members, each of the plurality of retention members including a leg portion and a hook portion, the leg portion extending from an inner perimeter of the annulus, the hook portion projecting from the leg portion toward a central axis of the annulus, the hook portion being acute to the central axis;
    positioning the annulus of the clip within a retaining portion of the first housing member; and
    locating the first housing member proximate the second housing member so that a free end of the hook portion of each of the retention members engages a protrusion on the second housing.
    [21" id="US-20010004434-A1-CLM-00021] 21. The method of
    claim 20 , the step of providing further comprises:
    providing the sheet metal clip with five retention members uniformly disposed about the inner perimeter of the annulus, each of the retention members having at least a portion of the free end of their respective hook portions located on an imaginary circle that is concentric to the inner perimeter of the annulus.
    [22" id="US-20010004434-A1-CLM-00022] 22. A method of stamping a clip for retaining a first generally cylindrical housing to a second generally cylindrical housing, comprising:
    punching a particular sheet of metal configuration, the configuration having an interior cutout so that a plurality of substantially trapezoidal sheet metal members extending toward the central axis of the configuration; and
    forming each of the plurality of substantially trapezoidal sheet metal members into a retention members having a planar leg portion and a planar hook portion, the planar leg portion extending from an inner perimeter of a planar annulus created from the circular configuration, the planar hook portion projecting from the planar leg portion toward the central axis of the circular configuration, the planar hook portion being acute to the central axis.
    [23" id="US-20010004434-A1-CLM-00023] 23. The method of
    claim 22 , wherein the step of punching further comprises punching circular configuration; and the step of forming further comprises forming each retention members to have the planar leg portion extending from an inner perimeter of a planar annulus created from the circular configuration.
    [24" id="US-20010004434-A1-CLM-00024] 24. The method of
    claim 23 , wherein the step of punching further comprises providing the interior cutout as a centrally located pentagon with a generally triangular members extending from each corner of the pentagon.
    [25" id="US-20010004434-A1-CLM-00025] 25. The method of forming a clip of
    claim 24 , wherein the step of forming further comprises locating the planar hook portion acute to the central axis so that the central axis and a plane passing through the planar hook portion form an angle in the range of approximately 20°-30°.
    [26" id="US-20010004434-A1-CLM-00026] 26. The method of
    claim 22 , further comprising forming a stiffener on the inner perimeter between each of the plurality of retention members.
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    法律状态:
    2006-03-29| REMI| Maintenance fee reminder mailed|
    2006-09-11| LAPS| Lapse for failure to pay maintenance fees|
    2006-10-12| STCH| Information on status: patent discontinuation|Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
    2006-11-07| FP| Expired due to failure to pay maintenance fee|Effective date: 20060910 |
    优先权:
    申请号 | 申请日 | 专利标题
    US09/342,589|US6227785B1|1999-06-29|1999-06-29|Self-tightening clip|
    US09/770,981|US6446320B2|1999-06-29|2001-01-26|Method of retaining a first housing to a second housing using a self-tightening clip|US09/770,981| US6446320B2|1999-06-29|2001-01-26|Method of retaining a first housing to a second housing using a self-tightening clip|
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