Cast in situ retention features for a press fit assembly

Details Cast in situ retention features for a press fit assembly Cast in situ retention features for a press fit assembly

1999-02-08

2001-01-30

Reichard, Dean A. (Department: 2831)

Electricity: conductors and insulators

Conduits, cables or conductors

Single duct conduits

C220S003920, C174S1520GM, C174S15300A

Reexamination Certificate

active

06180883

ABSTRACT:

TECHNICAL FIELD
This invention relates to press fit assemblies and more particularly to retention features in a housing to which a deformable member is press fit.
BACKGROUND OF THE INVENTION
In many assemblies, a metal housing is secured to a frame by metal fasteners. The housing is preferably isolated electrically and/or vibrationally from the frame and the fasteners. To this end, the mounting member or isolator is a deformable polymer, such as nylon. Since it is desired to install the isolators when the housing is assembled and prior to attachment with the frame, a method of securing the isolators in apertures in the housing is required. To date this has been accomplished by machining the apertures to form an undercut or other irregular surface. It is also possible to install fasteners in the isolators when the housing is assembled, however this adds to the shipping weight and assembly cost; and the fasteners must be removed prior to installation on the frame which further adds to the overall product cost.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an improved assembly feature for securing a deformable isolator in an aperture.
In one aspect of the present invention, a cast housing is provided with a step or lip adjacent an outer surface of the housing. In another aspect of the present invention, the aperture is formed during casting by using die pins which are pulled in opposite directions. In a further aspect of the present invention, each die pin forms a pair of diametrically opposed quarter round lips.
In yet another aspect of the present invention, one die pin forms the lips at an upper surface of the housing and the other die pin forms the lips at a lower surface. In still another aspect of the present invention, an isolator incorporates two deformable nylon grommet members which are pressed in the aperture such that the outer surface of each grommet conforms to the inner surface of the aperture and the grommets are retained therein by respective ones of the lips.


REFERENCES:
patent: 3288910 (1966-11-01), Zerwes
patent: 3937352 (1976-02-01), Kalous
patent: 4390114 (1983-06-01), Sviatoslavsky et al.
patent: 5740936 (1998-04-01), Nash
patent: 5848718 (1998-12-01), Colwell

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