COAXIAL CABLE CONNECTOR WITH IMPROVED PHYSICAL AND RF SEALING

• US 20100255721A1
• Filed: 05/26/2009
• Published: 10/07/2010
• Est. Priority Date: 04/01/2009
• Status: Active Grant

• Current Assignee: PPC Broadband Incorporated (Belden Inc.)
• Original Assignee: John Mezzalingua Associates Incorporated
• Inventors: Purdy, Eric, Palinkas, Raymond
• Granted Patent: US 8,029,315 B2
• Time in Patent Office: Days
• US Class Current: 439/583
• CPC Class Codes: H01R 13/622 Screw-ring or screw-casing H01R13/623 takes precedence
• CPC Class Codes: H01R 13/6593 the shield being composed of different pieces
• CPC Class Codes: H01R 2103/00 Two poles
• CPC Class Codes: H01R 9/0521 Connection to outer conductor by action of a nut

Abstract

An F-type connector for connecting a coaxial cable to an interface port and extending an RF shield therebetween is provided. The connector includes a connector body having a first end and a second end, a post, attached to the connector body, a threaded nut, rotatable with respect to the post and also axially movable with respect to the connector body between a first position and a second position, a biasing member, operable to move the nut, and a joint stop element, located to interact with the biasing member and introduce obstructive structure that impedes axial movement of the nut.

Claims

1. An F-type coaxial cable connector comprising:

a connector body, having a first end and a second end;

a post, attached to the connector body;

a threaded nut, rotatable with respect to the post and also axially movable with respect to the connector body between a first position and a second position;

a biasing member, internally located axially and radially within the nut, the biasing member compressably operable to exert force on the nut tending the nut to move in a direction toward the second end of the connector body; and

a joint stop element, located to operably interact with the biasing member and introduce obstructive structure that impedes axial movement of the nut;

wherein the nut is movable in an axial direction toward the first end of the connector body when in a first position; and

wherein when the nut is located in a second position it is no longer movable in a direction toward the first end of the connector body, because the obstructive structure of the joint stop element physically impedes further movement of the nut.

2. The connector of claim 1, wherein the joint stop element comprises a spring stop member being operably sized and located to abut an internal stop feature of the nut, when the biasing member has been compressed and the nut has been moved to a second position.

3. The connector of claim 2, wherein the spring stop member is a split ring washer.

4. The connector of claim 1, wherein the joint stop element comprises a double spring stop member being operably sized and located to abut an internal stop feature of the nut, when the biasing member has been compressed and the nut has been moved to a second position.

5. The connector of claim 4, wherein the double spring stop member comprises two ring washers axially positioned next to one another.

6. The connector of claim 1, wherein the joint stop element comprises an enlarged flange of the post being operably sized and located to abut an internal stop feature of the nut, when the biasing member has been compressed and the nut has been moved to a second position.

7. The connector of claim 1, further comprising a fastener member including an internal ramped surface and an external detent, the fastener member operable to deformably compress the outer surface of the connector body to compressably secure a coaxial cable.

8. The connector of claim 7, wherein the joint stop element comprises a spring stop member portion of a skirt of the nut being operably sized and located to abut opposing edges of the external detent of the fastener member, when the biasing member has been compressed and the nut has been moved to a second position.

9. The connector of claim 8, wherein the connector body resides completely within the internal boundaries of the nut, when the nut is in a first position.

10. The connector of claim 1, wherein the joint stop element comprises a spring stop member portion of a skirt of the nut being operably sized and located to move between and abut one of two spaced-apart external stop features protruding from the connector body, when the biasing member has been compressed and the nut has been moved to a second position.

11. The connector of claim 1, further comprising a seal spacer, the seal spacer including a lip operatively configured to contact a corresponding flange of a post thereby facilitating the prevention of axial movement of the post in the direction of the seal spacer.

12. The connector of claim 11, further comprising a nut sealing member configured and located to reside in an annular pocket of the seal spacer, so that the nut sealing member is compressed between an inner surface of the nut and the seal spacer, to foster a physical seal between the nut and the sealing member.

13. The connector of claim 11, further comprising a body sealing member residing in an annular recess positioned at the first end of the connector body, so that the body sealing member is compressed between the connector body and a portion of the seal spacer.

14. The connector of claim 1, wherein the nut includes hex flats.

15. The connector of claim 1, wherein the nut includes a port seal surface feature located on the external portion of the nut proximate the first end of the nut and configured to facilitate mating of a port seal to help seal the connector against ingress of unwanted environmental contaminants.

16. An F-type coaxial cable connector for coupling a coaxial cable to an interface port, the coaxial cable including a center conductor surrounded by a dielectric material, the dielectric material being surrounded by an outer conductive grounding shield, the outer conductive grounding shield surrounded by a protective outer jacket, the F-type coaxial cable connector comprising in combination:

a connector body, having a first end and a second end, the second end configured to deformably compress against and seal a received coaxial cable;

a post, axially securely attached to the connector body, the post having a first end and a second end, the first end of the post including a flange and the second end of the post configured to be inserted into an end of the received coaxial cable around the dielectric and under at least one layer of the conductive grounding shield thereof;

a threaded nut, rotatable with respect to the post and also axially movable with respect to the connector body between a first position and a second position;

a biasing member, the biasing member compressably operable to exert force on the nut tending the nut to move in a direction toward the second end of the connector body;

a fastener member, including an internal ramped surface, the fastener member operable to deformably compress the outer surface of the connector body to axially secure the received coaxial cable between the connector body and the fastener member; and

a joint stop element, including obstructive structure of a component of the connector that is axially movable with respect to the received and secured cable and including obstructive structure of a component that is not movable with respect to the received and secured cable;

wherein the obstructive structure of the movable component with respect to the cable contacts the obstructive structure of the non-axially-movable component with respect to the cable when the nut is in a second position to impede axial movement of the nut in a direction toward the first end of the connector body.

17. The connector of claim 16, wherein an internal stop feature of the nut comprises the obstructive structure that is axially movable with respect to the cable and a spring stop member comprises the obstructive structure that is not axially movable with respect to the cable.

18. The connector of claim 16, wherein an internal stop feature of the nut comprises the obstructive structure that is axially movable with respect to the cable and a double spring stop member comprises the obstructive structure that is not axially movable with respect to the cable.

19. The connector of claim 16, wherein an internal stop feature of the nut comprises the obstructive structure that is axially movable with respect to the cable and an enlarged flange of the post comprises the obstructive structure that is not axially movable with respect to the cable.

20. The connector of claim 16, wherein a stop member portion of a skirt of the nut comprises the obstructive structure that is axially movable with respect to the cable and a an external detent of the fastener member comprises the obstructive structure that is not axially movable with respect to the cable.

21. The connector of claim 16, wherein a stop member portion of a skirt of the nut comprises the obstructive structure that is axially movable with respect to the cable and an external surface feature protruding from the connector body comprises the obstructive structure that is not axially movable with respect to the cable.

22. A coaxial cable connector comprising:

a connector body;

a post, attached to the connector body;

a threaded nut, rotatable with respect to the post and also axially movable with respect to the connector body between a first position and a second position;

a biasing member, operable to exert force on the nut to move the nut; and

means for impeding axial movement of the nut in one axial direction, when the nut resides in the second position;

wherein the means remain structurally sound during the buildup of axial force applied thereto, as threadable rotational torque is exerted when the nut is tightened into mating with a corresponding interface port, through operation of a wrench; and

wherein the means prevent the connector from experiencing structural and functional deformation because the movement impediments of the means prevent the biasing member from being over-compressed causing connector components to yield and thus not properly function during repetitive use.

23. A method of extending an RF grounding shield from a coaxial cable to a cable interface port, the method comprising:

providing an F-type coaxial cable connector to connect the coaxial cable to the interface port, the F-type coaxial cable connector comprising;

a connector body, having a first end and a second end;

a post, attached to the connector body and operable to receive the coaxial cable;

a threaded nut, rotatable with respect to the post and also axially movable with respect to the connector body between a first position and a second position;

a biasing member, operable to exert force on the nut tending the nut to move in a direction toward the second end of the connector body; and

a joint stop element, located to interact with the biasing member and introduce obstructive structure that impedes axial movement of the nut;

wherein the nut is movable in an axial direction toward the first end of the connector body when in a first position; and

wherein when the nut is located in a second position it is no longer movable in a direction toward the first end of the connector body, because the obstructive structure of the joint stop element physically impedes further movement of the nut;

rotating the nut to thread the nut onto the interface port a distance sufficient for the post of the connector to contact the port, wherein the position of the connector structure when the post initially contacts the port corresponds to a first position;

advancing and tightening the nut further onto the port to ensure electrical contact between a mating edge of the port and a mating edge of the post, wherein, as the nut advances onto the port it axially slidably moves with respect to the post and connector body in a direction toward the first end of the connector body, so that the associated biasing member exerts resultant force to drive the post into firm contact with the interface port; and

impeding further axial movement of the nut with respect to the post and the connector body, by bottoming out the movement of the nut through operation of obstructive structure of the joint stop element so that the bottoming out of the movement of the nut corresponds to a second position, wherein the nut is no longer axially movable in a direction toward the first end of the connector body.

24. The method of claim 23, wherein the nut includes hex flats and is tightened onto the interface port through use of a wrench.

25. The method of claim 23, wherein the connector further includes a fastener member, including an internal ramped surface, the fastener member operable to deformably compress the outer surface of the connector body to axially secure the received coaxial cable between the connector body and the fastener member.

26. The method of claim 23, wherein the connector further includes a tubular locking compression member located to protrude axially into an annular chamber of the connector through its rear opening, the tubular locking compression member being slidably coupled to the connector body displaceable axially between a first open position, accommodating insertion of the post into a prepared cable end to electrically contact the grounding shield, and a second clamped position compressibly fixing the cable within the chamber of the connector.

27. The method of claim 23, wherein the nut includes a port seal surface feature and the installation of the nut on the port further includes securing a port seal over and around portions of the port and the nut, including the port seal surface feature, to prevent ingress of environmental contaminants.

28. The method of claim 23, wherein the bottoming out of the nut prevents over-compressing of the biasing member and corresponds to a physical condition associated with tightening torque in compliance with industry standard torque installation guidelines and optimal performance of the coaxial cable connector.