Damper for a door handle

CA 02315313 2000-07-19

029-84 PAMPER FOR A PQQR HANDLE

BACKGROUND OF THE INVENTION

Field of the Invention

This invention pertains to damper for a door handle. More particularly, the present invention provides a molded-in gear rack on the pivoting component of the door handle and a fluid gear damper snapped into a boss on the housing of the door handle.

Furthermore, the gear damper includes a rib configuration which allows the gear damper to be rotated one-quarter turn to engage the door handle housing.

Description of the Prior Art

The use of cylindrical dampers mounted on the hinges of automotive door handles and similar applications is known in the prior art. However, such a damper is typically relatively large in order to provide the surface area needed to dampen the strong spring force in the door handle because it is mounted on the hinge and experiences the maximum torque from the spring.

These prior art dampers have similarly been bulky to package.

Moreover, it has been somewhat difficult to calculate the expected closing time of the handle and any variation of this closing time typically was achieved by changing the surface area of the damper.

CA 02315313 2003-12-15 which further affects the size of the damper and can require a substantial redesign of the damper. Finally, the dampers have typically required several steps .for installation which is of concern during assembly-line or automated manufacture.

SUMMARY OF THE INVENTION

Accordingly this invention seeks to provide a damper for an automotive door handle or similar application which is relatively compact.

Further, this invention seeks to provide a damper for an automotive door handle or similar application which is simple to package .

Further still, this invention seeks to provide a damper for an automotive door handle or similar application for which the expected closing time is relatively simple to calculate.

Still, further, this invention seeks to provide a damper for an automotive door handle or similar application wherein the required redesign to vary the expected closing time of the door is minimized.

Yet further this invention seeks to provide a damper for an automotive door handle or similar application wherein the damper can be simply assembled and installed.

CA 02315313 2003-12-15

The invention in one broad aspect provides a door handle assembly comprising a body including pivot points, a door handle pivoting on the pivot points and a gear rack formed integrally with the door handle, the gear rack having a gear profile extent formed equidistant from one of the pivot points. The gear profile extent has a pitch. A damper includes a rotational gear engaging the gear profile extent a pitch matching that of the profile extent, whereby the rotational gear rotates in concert with the pivoting of the door handle. A damper support plate engages the body, the damper support plate has an aperture for engaging the rotational damper, wherein the aperture is generally circular and includes radially outwardly extending openings and wherein the rotational damper includes a cylindrical portion with a first pair of radially extending ribs which pass through the radially extending openings and a second pair of radially extending ribs which limit the insertion of the rotational damper through the damper support plate.

More particularly, the invention provides a damper for an automotive door handle or similar application which includes a molded-in gear rack on the pivoting mechanism of the door handle

CA 02315313 2000-07-19 and a fluid gear damper which is snapped into a boss on the housing of the door handle. The gear on the damper is of the same pitch as the molded-in gear rack and the pitch circles are tangent.

The gear damper is a one-quarter turn viscous door handle gear damper. During assembly, the damper is placed through the molded opening in the door handle housing and turned one-quarter turn.

Lower ribs on the damper housing contact the back side of the door handle housing and top ramped ribs on the damper housing are forced over bumps molded on the top surface of the door handle housing.

The damper locks into position by the top ramped ribs being forced over the bumps. After installation, the damper gear meshes with a gear rack molded to the back of the pivoting handle.

BRIEF DESCRIPTION OF_THE_ DRAWINGS

Further objects and advantages of the invention will become apparent from the following description and claims, and from the accompanying drawings, wherein:

Figure 1 is a perspective drawing of the door handle assembly of the present invention.

Figure 2 is a perspective view of the damper assembly housing of the present invention.

Figure 3 is a perspective view of the planar damper support

CA 02315313 2000-07-19 plate which engages the damper assembly housing of the present invention.

Figure 4 is a perspective view of the damper assembly housing engaged within the planar damper support plate.

CA 02315313 2000-07-19

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring now to the drawings in detail wherein like numerals refer to like elements throughout the several views, one sees that

Figure 1 is a perspective view of the door handle assembly 10 of the present invention, as viewed outwardly from the interior of the automotive door panel (not shown). Door handle assembly 10 includes exterior plate 12 which is typically nearly flush with the exterior or exposed surface of the automotive door. The remaining elements of Figure 1 are within the interior of the automotive door. A handle recess is formed on the exterior of the automotive door by inwardly extending wall 16 which meets upper and lower oblique walls 18, 20 and upper support wall 22. Slot 24 is formed on upper oblique wall 18 and upper support wall 22 inwardly adjacent from inwardly extending wall 16. Likewise, slot 26 is formed parallel to slot 24 at an end of walls 18, 20, 22. Pivot support 28 extends upwardly inwardly extending wall 16. Likewise, pivot support 30 extends upwardly from an unillustrated wall which bounds the handle recess. Pivot supports 28, 30 provide pivots 32, which form a pivot axis therebetween upon which arms 36, 38 of door handle 40 are journalled for rotation. Handle grip (not shown, but would be visible by viewing Figure 1 from the opposite direction) is integrally formed with arms 36, 38 and spans between

CA 02315313 2000-07-19 arms 36, 38 within the handle recess formed by walls 16, 18, 20, .

Gear rack 42 is molded into distal surface 44 of arm 38. The extent of gear rack 42 is formed equidistantly from pivot 34. That is, the extent of gear rack 42 is a portion of a circle. Gear rack 42 engages circular gear 46 of circular damper 48. Circular damper is engaged within aperture 50 formed within planar damper support plate 52. The circular gear 46 of circular damper 48 is of the same pitch as the gears of gear rack 42, and the pitch circles of circular gear 46 and the gears of gear rack 42 are tangent. Arm therefore pivots in concert with the rotation of circular gear 4 6 by the meshing of gear rack 42 with circular gear 46. Further, the molded-in gear rack 42 provides a radius from the pivot 34 that decreases the tangential force on the circular damper 48. The closing time of the door handle 4 0 can be easily calculated and modified by changing the pitch diameter of the molded-in gear rack rather than changing the surface area of the circular damper 48 which would affect the size of circular damper 48.

Housing 51 of circular damper 48 is shown in Figure 2 while planar damper support plate 52 is shown in Figure 3 and the assembled circular damper 48 on planar damper support plate 52 is shown in Figure 4.

CA 02315313 2000-07-19

Housing 51 of circular damper 48 includes a cylindrical portion 56 of a first diameter, and a cylindrical mouth 58 of an increased second diameter. Toroidal wall 57 joins cylindrical portion 56 to cylindrical mouth 58 and cylindrical wall 59 extends upwardly from toroidal wall 57 forming inner circular lip 61. Upper ramped ribs 60, 62 extend radially outward from the top of cylindrical mouth 58 and lower ramped rib 64 (along with an unillustrated lower ramped rib spaced 180° about the periphery of cylindrical mouth 58 from lower ramped rib 64) . The distance between the lower surface of upper ramped ribs 60, 62 and the upper surface of lower ramped ribs 64 as measured parallel to the longitudinal axis of circular damper 48 is equal to the thickness of planar damper support plate 52 so that ribs 60, 62, 64 serve to longitudinally position circular damper within aperture 50 as shown in Figure 4.

As shown in Figure 3, planar damper support plate 52 includes aperture 50 of the second diameter (that is, to allow cylindrical mouth 58 of damper housing 51 to pass therethrough) which further includes diametrically opposed radially outwardly extending wing openings 54, 56 which are shaped to allow upper ramped ribs 60, 62 to pass therethrough. Hemispherical detent bump 66 and cylindrical stop 68 are formed on a planar surface of planar damper support

CA 02315313 2000-07-19 plate 52 immediately outwardly adjacent from aperture 50.

To assemble circular damper 48 with planar damper support plate 52, cylindrical mouth 58 of damper housing 51 is passed through aperture 52 with upper ramped ribs 60, 62 passing through diametrically opposed radially outwardly extending wing openings

54, 56. Lower ramped ribs 64 limit the insertion of circular damper 48 through aperture 50 so that the lower surface of upper ramped ribs 60, 62 engage or urge against the upper surface of planar damper support plate 52. The installer then rotates circular damper 48 approximately one-quarter turn so that one of upper ramped ribs 60, 62 passes over hemispherical detent bump 66 and locks in position, and another of upper ramped ribs 60, 62 abuts cylindrical stop 68. Upper ramped ribs 60, 62 are ramped on their lower surface such that the upper ramped ribs 60, 62 can pass over hemispherical detent bump 66 to enter the locked position, but cannot easily pass back over hemispherical detent bump 66 to move out of the locked position. Circular damper 48 is thereby locked into the position illustrated in Figure 4.

Thus the several aforementioned objects and advantages are most effectively attained. Although a single preferred embodiment of the invention has been disclosed and described in detail herein, it should be understood that this invention is in no sense limited

CA 02315313 2000-07-19 thereby and its scope is to be determined by that of the appended claims .