U.S. patent number 3,571,779 [Application Number 04/774,149] was granted by the patent office on 1971-03-23 for self-sealing pinboard.
This patent grant is currently assigned to AMP Incorporated. Invention is credited to John Covell Collier.
United States Patent |
3,571,779 |
Collier |
March 23, 1971 |
SELF-SEALING PINBOARD
Abstract
The contacts of a pinboard are sealed against moisture or
corrosive atmospheres by a layer of rubber which is punctured when
a pin is inserted. The edges of the hole formed in the rubber form
a seal around the pin.
Inventors: |
Collier; John Covell
(Farnworth, EN) |
Assignee: |
AMP Incorporated (Harrisburg,
PA)
|
Family
ID: |
10464310 |
Appl.
No.: |
04/774,149 |
Filed: |
November 7, 1968 |
Foreign Application Priority Data
|
|
|
|
|
Nov 18, 1967 [GB] |
|
|
52543/67 |
|
Current U.S.
Class: |
439/587; 439/426;
361/633; 439/271; 439/272 |
Current CPC
Class: |
H01R
9/28 (20130101); H01R 13/453 (20130101) |
Current International
Class: |
H01R
9/22 (20060101); H01R 9/28 (20060101); H01R
13/44 (20060101); H01R 13/453 (20060101); H01r
007/04 (); H01r 013/52 () |
Field of
Search: |
;339/18,94,96,111 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Champion; Marvin A.
Assistant Examiner: Clifford; Patrick A.
Claims
I claim:
1. An electric contact arrangement comprising a plurality of
contacts mounted within a housing of insulating material closed on
one side by an insulating side member formed with apertures aligned
with respective contacts within the housing for insertion of pins
through the apertures, each contact comprising a base strip portion
having a pair of contact arms bent up one from each side and
convergent towards their free ends, an aperture being formed in the
base strip portion for passage of a pin through the contact
aperture to engage between the arms, the base strip portion being
disposed against a sealing diaphragm of resilient sealing material
positioned between the base strip and the one side of the housing,
the contact apertures of the plurality of contacts being aligned
with respective apertures in the housing one side and the contact
arms extending away from the housing one side such that on
inserting a pin through an aperture in the one side of the housing
to pierce the diaphragm, penetrate the associated contact aperture
and engage between the contact arms, resilient sealing material of
the diaphragm is trapped between the pin and the surrounding wall
of the aperture in the base strip.
Description
This invention relates to a circuit contact arrangement comprising
a housing of insulating material containing a plurality of contacts
aligned with apertures on one side of the housing through which
apertures conductive pins can be inserted to connect with the
contacts.
Such circuit contact arrangements have may applications
particularly in the fields of selective switching and programming
where they can be incorporated as pinboards or plugboards. Often
the apparatus of which they form part has to be used in a corrosive
or damp atmosphere such as in a chemical processing plant or in a
ship which travels through the tropics. In such applications, the
quality of the electrical contact between the contact and the pin
can quickly deteriorate which may lead to a fault occurring in the
apparatus. It is thus necessary to provide for the contact area to
be protected from the effects of any corrosive ambient
atmosphere.
According to the present invention a circuit contact arrangement
comprises a housing of insulating material containing a plurality
of contacts aligned with apertures on one side of the housing and
resilient sealing means closing the apertures.
An object of the invention is to provide a pinboard having a
sealing diaphragm disposed in position thereon to seal the contacts
of the pinboard from ambient atmospheric conditions.
Another object is the provision of a pinboard wherein the sealing
diaphragm thereon is pierced by pins to reach the contacts
therein.
A further object is to provide a pinboard wherein the sealing
diaphragm thereon is slit at areas in alignment with holes in the
pinboard and contacts so that parts of the diaphragm are trapped
between the contact holes and pins thereby effecting a
moistureproof seal or retardation of corrosiveness to the contact
means.
Other objects and attainments of the present invention will become
apparent to those skilled in the art upon a reading of the
following detailed description when taken in conjunction with the
drawings in which there are shown and described illustrative
embodiments of the invention; it is to be understood, however, that
these embodiments are not intended to be exhaustive nor limiting of
the invention but are given for purposes of illustration in order
that others skilled in the art may fully understand the invention
and the principles thereof and the manner of applying it in
practical use so that they may modify it in various forms, each as
may be best suited to the conditions of a particular use.
In order that the invention may be readily understood two
embodiments of a circuit contact arrangement will now be described
with reference to the accompanying drawing.
In the drawing:
FIG. 1 is a part sectional perspective view of the first
embodiment; and
FIG. 2 is a cross-sectional view of the second embodiment.
Referring first to FIG. 1, the circuit contact arrangement shown
here forms a pinboard in which a variety of different programs can
be set up by inserting pins to establish different contact
patterns. The pinboard comprises a housing of insulating material
made of two parts, a block or base part 1 and a top panel 2. The
base part 1 houses two sets of electrical contacts 3,4 arranged one
above the other in rows and columns respectively. Each row or
column of contacts is identical and comprises a base strip 5 of
conductive material having pairs of contact arms 6 bent up from its
edges. The pairs of arms 6 are equally spaced along the length of
the strip and are inwardly inclined towards their free ends and
formed with a contact area 7. Holes 8 are made in base strip 5 and
aligned with the centers of the pairs of contact arms 6. The sets
of contacts are arranged so that the contacts are equally spaced
and so that contacts of each row are aligned with the contacts of
the columns and with the holes 8 in alignment. The panel 2 is
provided with an array of apertures 9 in line with the holes 8 of
the contacts so that a pin 10 can be inserted through a selected
aperture 9 to connect a selected row 3 of contacts with a selected
column 4 of contacts below it. In order to enable preselected
programs to be set up, the panel 2 has a mask 11 placed over it
which enables only certain contacts to be made through holes 12.
The other apertures 9 are masked off and no wrong connection can
therefore be made by a pin 10.
The base 1 is a solid molding and has the panel 2 secured to it by
screws (not shown). A diaphragm 15 is placed across the top of the
base part 1 and rests against the underside of the plate 2. The
diaphragm is made of a resilient rubber sheet or other suitable
material and acts as a gasket to prevent moisture reaching the
contacts through the joints between base part 1 and panel 2.
Assuming that there are no pins in the panel 2 the diaphragm 15
effectively seals off the apertures 9 and prevents any moisture
reaching the contacts through these apertures.
When a program is to be set up, pins 10 are inserted through the
appropriate apertures 9 into the body of block 1 to make
connections between appropriate sets of contacts 3,4. To reach the
contacts the pin 10 has to pierce the diaphragm 15. Due to its
resilient nature the diaphragm will cling closely around the pin to
prevent any moisture from the atmosphere reaching the contacts
around the area of the pin where the diaphragm is ruptured. When a
pin is withdrawn the resilient nature of the diaphragm enables it
to close together so that the hole formed in it does not allow the
ingress of moisture from the atmosphere to the contacts.
In the second embodiment in FIG. 2, to which reference is now made,
the contact arrangement is similar to that of FIG. 1 but the sets
of contacts are only arranged in rows for bussing purposes and the
diaphragm is weakened in the region of the apertures to ease the
insertion of a pin. Furthermore to ensure that electrical and
atmospheric isolation occurs the rows of contacts are isolated from
each other.
The pinboard comprises a base 20 having a bottom plate 21 with
sidewalls 22. The base is divided along its length by intermediate
walls 23 having a height equal to that of the sidewalls 22. The
walls 22,23 and the bottom panel 21 are made as an integral molding
from a plastic insulating material. A top panel 24 rests on top of
the walls 22,23 and is separated from the part 20 by a resilient
plastic diaphragm 25 as shown. Sets of contacts 26 similar to the
contacts 3,4 of FIG. 1 lie in the channels formed by the walls
23,24 and are secured at their ends by means (not shown) to lie
with their base strips 27 along the top of the channels. The base
strips 27 are provided with holes 28 aligned with apertures 29 in
the top panel 24. The area of the diaphragm 25 in line with each
pair of holes 28 and apertures 29 is slit at 30 to enable a plug or
pin member 31 secured to a wire 32 to be inserted easily and with
little risk of tearing the diaphragm 25.
The effect of inserting the pin 31 into the pinboard can be seen
well in FIG. 2. As the pin is inserted through the diaphragm, the
slit 30 opens to allow the pin to pass through, and, at the same
time, the edges of the diaphragm in the area of the slit are pulled
down into the channel to trap the material of the diaphragm between
hole 28 and the pin 31. This gives an effective moistureproof seal.
When the pin is withdrawn, the edges of the diaphragm slit drawn
into the hole 28 are removed and the slit closes up to seal
aperture 29.
The diaphragm need not be weakened only by producing a slit such as
30 but may be formed with areas of less thickness in the area of
the apertures 29. Although it is useful for the diaphragm to extend
right across the base 20 since it also serves as a gasket between
the walls 22,23 and the top panel 24, it is not essential that it
follow this form. Separate conventional gaskets could be used so
that even if atmosphere leaked into one channel, it would not pass
into all the channels and each aperture 29 could be provided with a
separate sealing diaphragm.
It will, therefore, be appreciated that the aforementioned and
other desirable objects have been achieved; however, it should be
emphasized that the particular embodiments of the invention, which
are shown and described herein, are intended as merely illustrative
and not as restrictive of the invention.
* * * * *