# Patent

## Title
Rocket-launcher docking system

## Abstract

An electrical connector that avoids some of the disadvantages associated with electrical connectors in the prior art. In particular, the illustrative embodiment of the present invention uses spring-loaded contacts to maintain connection in the presence of the vibration associated with a rocket launch, and also includes an environmental seal and electro-magnetic shield so as to provide an environment for the electrical contacts that is isolated from the ambient environment and external electromagnetic radiation. Furthermore, the illustrative embodiment avoids the possibility of bent connector pins, which would make mating between the electrical connectors.

## Background
The U.S. Government has a paid-up license in this invention and the right in limited circumstances to require the patent owner to license others on reasonable terms as provided for by the terms of Contract No. DAAH01-03-C-0035 awarded by the U.S. Government.


FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION
Mobile multi-cell rocket launchers are used by the military to provide firepower during a combat situation. The launcher electronics (e.g., control, power, and targeting systems, etc.) and launch platform necessary to control and fire each rocket are bulky and expensive; therefore, modern multi-cell rocket launchers use modularity to reduce overall system cost and bulkiness.
A common infrastructure, which includes the launcher electronics and launch platform, is used in conjunction with replaceable canisters, which each contain a rocket. Each canister provides a substantially air-tight environment that reduces the rocket's exposure to dust, humidity, and other environmental factors. The canisters need to be easily replaced in a combat situation; i.e. it must be possible to quickly remove a spent canister and replace it with a fresh canister to replenish the total firepower of the launcher.
In the prior art, the loading of a canister into a launch platform requires complicated handling by the crew manning the platform. In particular, in order to connect the electronics contained within the canister to the launcher electronics (i.e., the electronics NOT contained in the canister), the crew must attach the electrical cables associated with the platform to the electrical cables associated with the canister. Furthermore, the crew must ensure that the cables are not severed or damaged while the canisters are loaded.
Therefore, the need exists for an electrical connection that avoids or mitigates some or all of these problems.
SUMMARY OF THE INVENTION
The present invention enables a docking system for a rocket-containing canister and a launch platform that avoids some of the disadvantages for doing so in the prior art. In particular, the illustrative embodiment of the present invention uses mechanical alignment features, spring-loaded electrical contacts, an environmental seal, and an electro-magnetic radiation shield to establish and maintain reliable electrical interconnection between the rocket and the launcher electronics.
The present invention enables a rocket-containing canister to be loaded into a multi-cell rocket launcher while also establishing electrical connection between the rocket and launcher electronics associated with the multi-cell rocket launcher. Once established, the electrical interconnection between the rocket and multi-cell rocket launcher is maintained even in the presence of the vibration associated with a rocket launch, dirt or other airborne contaminants, or external electro-magnetic radiation.
The illustrative embodiment comprises: a spring-loaded electrical contact, a seal for providing an environmental seal, and a shield for providing an electro-magnetic-interference shield, wherein both the environmental seal and the electro-magnetic-interference shield surround the spring-loaded contact so that when the electrical connector is mated, the spring-loaded contact is enclosed in an environment that is substantially isolated from the ambient environment and substantially isolated from external electro-magnetic radiation.



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 depicts a representational diagram of the salient components of a vehicle-borne multi-cell launcher in accordance with the illustrative embodiment.
FIG. 2 depicts a perspective view of the salient components of a multi-cell launcher in accordance with the illustrative embodiment of the current invention.
FIG. 3 depicts a perspective view of the salient components of a representative canister in accordance with the illustrative embodiment of the current invention.
FIG. 4 depicts an exploded view of the salient components of a canister and a receptacle in accordance with the illustrative embodiment of the current invention.
FIG. 5 depicts a top-down view of the salient components of a pallet connector and a bottom-up view of a canister connector in accordance with the illustrative embodiment of the current invention.
FIG. 6 depicts an exploded cross-sectional view of the salient components of a pallet connector and a canister connector in accordance with the illustrative embodiment of the current invention.
FIG. 7 depicts a cross-sectional view of the salient components of an alternative embodiment of the present invention.
FIG. 8 depicts a cross-sectional view of the salient components of a resilient contact according to the illustrative embodiment of the present invention.



DETAILED DESCRIPTION
FIG. 1 depicts a representational diagram of the salient components of a vehicle-borne multi-cell launcher in accordance with the illustrative embodiment. Although multi-cell launcher 102 is mounted on vehicle 100, it will be clear to those skilled in the art how to make and use alternative embodiments of the present invention in which multi-cell launcher 102 is mounted on another vehicle, such as a railroad car, warship, submarine, space vehicle, satellite, or stationary ground-based platform.
FIG. 2 depicts a perspective view of the salient components of multi-cell launcher 102. Launcher 102 comprises eight canisters 2061,1 through 2062,4, and launch pallet 216. Launch pallet 216 comprises eight canister receptacles 2171,1 through 2172,4, and pallet connectors 2181,1 through 2182,4 (for clarity, only receptacles 2171,4 and 2172,4 and pallet connectors 2181,4 and 2182,4 are shown). Although multi-cell launcher 102 comprises eight canisters and eight canister receptacles, it will be clear to those skilled in the art, after reading this disclosure, how to make and use embodiments of the present invention that comprise any number of canisters and canister receptacles.
Multi-cell launcher 102 is a system that has the capability of launching a plurality of rockets from its launch platform. Launch pallet 216 accepts and holds rocket-containing canisters 204i,j in canister receptacle 206i,j wherein i is a positive integer in the set {1, . . . 2}, and j is a positive integer in the set {1, . . . 4}. After a rocket is launched from canister 204i,j, the spent canister can be replaced by an unused canister to replenish the fire power of multi-cell launcher 102.
Launch pallet 216 comprises canister receptacles 2061,1 through 2062,4, which provide mechanical structure to which canisters 2041,1 through 2042,4 are mounted. In addition, each canister receptacle 206i,j includes pallet connector 208i,j, which provides an electrical interface between canister 206i,j and fire control.
FIG. 3 depicts a perspective view of the salient components of canister 204i,j. Canister 204i,j, comprises rocket 310i,j, housing 312i,j, connector plate 314i,j, canister connector 316i,j, canister-to-rocket umbilical 318i,j, rear legs 320, and front legs 322.
Housing 312i,j, fly-through cover 313i,j, and connector plate 314i,j are sheet metal that form a substantially weather-proof and dust-proof environment for rocket 310i,j, such that rocket 310i,j does not suffer from environmental conditions (e.g., dust, rain, dirt, etc.).
Connector plate 314i,j comprises canister connector 316i,j, rear legs 320, and front legs 322. Canister connector 316i,j mates with pallet connector 208i,j when rear legs 320 and front legs 322 are engaged with their respective alignment holes, rear slots 424 and front slots 426 (which are depicted in FIG. 4). When canister 204i,j is inserted into receptacle 206i,j, rear legs 320 and front legs 322 engage rear slots 424 and front slots 426 in a single orientation, and, as a consequence, canister connector 316i,j is properly aligned with pallet connector 208i,j to ensure the interconnection of their appropriate contacts.
FIG. 4 depicts an exploded view of the salient components of canister 2042,4 and receptacle 2062,4 in accordance with the illustrative embodiment of the current invention. Canister 2042,4 includes connector plate 3142,4, which comprises canister connector 3142,4, rear legs 320, and front legs 322. Receptacle 2062,4 comprises pallet connector 2082,4, rear slots 424, and front slots 426. Further, and as depicted in more detail in FIG. 5, canister connector 3162,4 comprises canister annulus 432 and canister contacts 434, and pallet connector 2082,4 comprises pallet annulus 428 and pallet contacts 430.
As canister 2042,4 engages receptacle 2062,4, rear legs 320 engage rear slots 424 such that canister 2042,4 can only seat in receptacle 2062,4 in a single orientation. Once rear legs 320 have engaged rear slots 424, canister 2042,4 rotates into position above receptacle 2062,4 enabling front legs 322 to be inserted into front slots 426. The insertion of rear legs 320 and front legs 322 into slots 424 and 426 aligns canister connector 3162,4 and pallet connector 2082,4.
FIG. 5 depicts a top-down view of the salient components of pallet connector 208i,j and a bottom-up view of canister connector 316i,j in accordance with the illustrative embodiment of the current invention. Canister connector 316i,j comprises canister annulus 432, shield seat 544, seal seat 546, contacts 4341,1 through 4342,2 (collectively, contacts 434), canister connector face 539, and canister key 538.
Pallet connector 208i,j comprises pallet annulus 428, shield seat 540, seal seat 542, contacts 4301,1 through 4302,2 (collectively, contacts 430), pallet connector face 537, and pallet key 536.
Canister connector 316i,j and pallet connector 208i,j include pallet key 536 and canister key 538, respectively, and are designed to mate in a single orientation that ensures proper interconnection of contacts 434, which depend from canister connector face 539, with contacts 430, which depend from pallet connector face 537, (i.e., contact 4341,1 interconnected to 4301,1, . . . , 4342,2 interconnected to 4302,2). Additionally, correct alignment of pallet connector 208i,j and canister connector 316i,j ensures that shield seat 540 aligns with shield seat 544, and seal seat 542 aligns with seal seat 546 such that when seat 648 and shield 650 are present (as depicted in FIGS. 6 and 7), shield 650 is located in shield seats 540 and 544, and seal 648 is located in seal seats 542 and 546.
FIG. 6 depicts an cross-sectional view of the salient components of pallet connector 208i,j and canister connector 316i,j, as taken through line a—a of FIG. 5, in accordance with the illustrative embodiment of the current invention. Pallet connector 208i,j comprises circuit board 652, pallet annulus 428 that includes shield seat 540 and seal seat 542, resilient contacts 4301,1 and 4301,2, pallet key 536, shield 650, and seal 648. Canister connector 316i,j comprises printed circuit board 654, canister annulus 432 that includes shield seat 544 and seal seat 546, resilient contacts 4341,1 and 4341,2, and pallet key 538.
Circuit board 652 provides connection between resilient contacts 4301,1 and 4301,2 to the launcher electronics associated with multi-cell launcher 102. Pallet annulus 428 and canister annulus 432 provide structure to hold shield 650 and seat 648 such that when pallet connector 208i,j is mated to canister connector 316i,j, resilient contacts 430 and 434 are enclosed in an environment that is substantially free of externally-generated electro-magnetic radiation and substantially isolated from the external ambient environment. Pallet key 536 and canister key 538 ensure proper alignment of pallet annulus 428 to canister annulus 432 and resilient contacts 430 to resilient contacts 434.
Resilient contacts 4301,1, 4301,2, 4341,1, and 4341,2 are flexible, spring-loaded electrical contacts. When pallet connector 208i,j and canister connector 316i,j are mated, resilient contacts 4301,1 and 4341,1 are compressed against each other, and resilient contacts 4301,2 and 4341,2 are compressed against each other, and at least one contact in each compressed pair deforms. During a rocket launch, although vibration causes canister 204i,j and receptacle 206i,j to move with respect to one another, the resiliency of resilient contacts 430 and 434 ensures that positive electrical contact is maintained.
FIG. 7 depicts a cross-sectional view, as taken through the line a—a of FIG. 5, of the salient components of an alternative embodiment of the present invention. Referring to FIG. 7, pallet connector 208i,j comprises circuit board 652, pallet annulus 428 that includes shield seat 540 and seal seat 542, rigid contacts 7561,1 and 7561,2, pallet key 536, shield 650, and seal 648. Canister connector 316i,j comprises printed circuit board 654, canister annulus 432 that includes shield seat 544 and seal seat 546, resilient contacts 4341,1 and 4341,2, and pallet key 538.
As in the illustrative embodiment, when pallet connector 208i,j is mated to canister connector 316i,j, printed circuit boards 652 and 654, pallet annulus 428, canister annulus 432, shield 650 and seal 648 together enclose rigid contacts 756 and resilient contacts 434 in an environment that is substantially free of externally-generated electro-magnetic radiation and substantially isolated from the external ambient environment. Additionally, as in the illustrative embodiment, pallet key 536 and canister key 538 ensure that pallet connector 208i,j mates properly to canister connector 316i,j.
When pallet connector 208i,j and canister connector 316i,j are mated, resilient contact 4301,1 is compressed against rigid contact 7561,1, and resilient contact 4301,2 is compressed against rigid contact 7561,2 such that resilient contacts 4301,1 and 4301,2 deform. During a rocket launch, although vibration causes canister 204i,j and receptacle 206i,j to move with respect to one another, the resiliency of resilient contacts 4301,1 and 4301,2 ensures that positive electrical contact with rigid contacts 7561,1 and 7561,2 is maintained.
FIG. 8 depicts a cross-sectional view of the salient components of resilient contact 434i,j in accordance with to the illustrative embodiment of the present invention. Resilient contact 434i,j comprises spring 858i,j that includes free-end 864i,j, and hold down 860i,j.
Spring 858i,j is formed from an electrically-conductive, resilient material, such as copper, gold-alloy, bronze, or aluminum, as is well-known by those skilled in the art. At one end, spring 858i,j is fixidly-attached by hold down 860i,j to via pad 862i,j on printed circuit board 654. At the other end, spring 858i,j is left unattached in order to allow for flexibility and resiliency when mated to another contact.
Although the illustrative embodiment comprises two alignment features (i.e., (1) legs 320 and 322 and slots 424 and 426, and (2) keys 536 and 538), it will be clear to those skilled in the art, however, after reading this specification, how to make and use alternative embodiments of the present invention that comprise any number of alignment features, alternative alignment features, or embodiments that rely on shield 650, seal 648, or both shield 650 and seal 648 to ensure the alignment of canister 204i,j to receptacle 206i,j.
Furthermore, it will be clear to those skilled in the art how to make and use alternative embodiments of the present invention in which shield 650 is located in shield seat 544, or seal 648 is located in seal seat 546, or shield 650 is located in shield seat 544 and seal 648 is located in seal seat 546.
Moreover, it will be clear to those skilled in the art how to make and use alternative embodiments of the present invention in which resilient contacts are formed using spring-loaded shaft-type contacts, leaf-spring contacts, button contacts, etc.
It is to be understood that the above-described embodiments are merely illustrative of the present invention and that many variations of the above-described embodiments can be devised by those skilled in the art without departing from the scope of the invention. For example, in this Specification, numerous specific details are provided in order to provide a thorough description and understanding of the illustrative embodiments of the present invention. Those skilled in the art will recognize, however, that the invention can be practiced without one or more of those details, or with other methods, materials, components, etc.
Furthermore, in some instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of the illustrative embodiments. It is understood that the various embodiments shown in the Figures are illustrative, and are not necessarily drawn to scale. Reference throughout the specification to “one embodiment” or “an embodiment” or “some embodiments” means that a particular feature, structure, material, or characteristic described in connection with the embodiment(s) is included in at least one embodiment of the present invention, but not necessarily all embodiments. Consequently, the appearances of the phrase “in one embodiment,” “in an embodiment,” or “in some embodiments” in various places throughout the Specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments. It is therefore intended that such variations be included within the scope of the following claims and their equivalents.

## Claims

1. An apparatus comprising:
a first connector face;
a first projection, wherein said first projection depends from a region of said first connector face, and wherein said first projection is resilient and electrically conductive;
a seal for substantially isolating said region from an ambient environment, wherein said seal forms a first annulus that surrounds said region; and
a shield for substantially isolating said region from external electro-magnetic radiation, wherein said shield forms a second annulus that surrounds said region.

2. The apparatus of claim 1 wherein said first annulus surrounds said second annulus.

3. The apparatus of claim 1 wherein said second annulus surrounds said first annulus.

4. The apparatus of claim 1 wherein said seal is a gasket comprising a material that is substantially impervious for air and moisture.

5. The apparatus of claim 1 wherein said shield is a gasket comprising electrically-conductive material.

6. The apparatus of claim 1 further comprising a second projection, wherein said second projection depends from said region of said first connector face, and wherein said second projection is resilient and electrically conductive.

7. The apparatus of claim 1 further comprising:
a second connector face;
a third projection, wherein said third projection depends from a region of said second connector face, and wherein said third projection is electrically conductive.

8. The apparatus of claim 7 wherein said third projection is resilient.

9. The apparatus of claim 7 wherein said third projection is rigid.

10. The apparatus of claim 7 further comprising an alignment feature, wherein said alignment feature ensures that said first projection aligns with and contacts said third projection.

11. The apparatus of claim 10 wherein said alignment feature comprises;
a first element for aligning said first connector face to said second connector face, wherein said first element is located on said first connector face; and
a second element for aligning said first connector face to said second connector face, wherein said second element is located on said second connector face; and
wherein said first element and said second element ensure that said first connector face and said second connector face align in a single orientation.

12. An apparatus comprising a self-mating connector, wherein said self-mating connector comprises;
(1) a first connector face comprising;
(a) a first annular region, wherein said first annular region surrounds a first planar region;
(b) a first projection, wherein said first projection depends from said first planar region, and wherein said first projection is resilient and electrically conductive; and
(c) a second projection, wherein said second projection depends from said first planar region, and wherein said second projection is resilient and electrically conductive;

(2) a second connector face comprising;
(a) a second annular region, wherein said second annular region surrounds a second planar region;
(b) a third projection, wherein said third projection depends from said second planar region, and wherein said third projection is electrically conductive; and
(c) a fourth projection, wherein said fourth projection depends from said second planar region, and wherein said fourth projection is electrically conductive;

(3) a seal for substantially isolating said first planar region and said second planar region from an ambient environment; and
(4) a shield for substantially isolating said first planar region and said second planar region from external electro-magnetic radiation.

13. The apparatus of claim 12 wherein said third projection and said fourth projection are compliant.

14. The apparatus of claim 12 wherein said third projection and said fourth projection are rigid.

15. The apparatus of claim 12 wherein said shield comprises an electrically-conductive material.

16. The apparatus of claim 12 further comprising an alignment system for aligning said first connector face and said second connector face mate in a single orientation wherein;
said first projection aligns with and contacts said third projection;
said second projection aligns with and contacts said fourth projection;
said seal substantially isolates said first planar region and said second planar region from said ambient environment; and
said shield substantially isolates said first planar region and said second planar region from external electro-magnetic radiation.

17. The apparatus of claim 12 wherein said alignment system comprises;
said first annular region; and
said second annular region;
wherein said first annular region and said second annular region nest in a single orientation.