Patent Grant
7788788
The field of this invention is tools for electricians or other electrical workers.
Coaxial cable has an inner conductor which is inside a cylindrical outer conductor. Both of the conductors are made of metal, and the outer conductor operates to carry the electrical signals on its interior wall surface while shielding those signals from any external interference. A dielectric insulator separates the two conductors, keeping the inner conductor in a coaxial relation to the outer conductor and maintaining both the electrical insulation between and the mechanical spacing of the two conductors. The dielectric material may be a solid continuous member, or individual separate rings spaced longitudinally along the length of the cable.
To connect two sections of coax cable it is necessary to have a two-part connector, each of whose parts is permanently attached to one end of a section of the coax cable. Since coax cables are usually very small their connectors are also quite small. Working in confined spaces, an electrician needs a good hand tool to assist in assembling (inserting or attaching) or detaching (removing or disassembling) the various connector parts. Presently standard tools have a shank which locks into a driving handle with a quarter-turn twist. That kind of mechanism works for either inserting or removing a connector part, but not for both, because the rotating drive is effective in only one direction.
One standard connector for coax cables is known as a BNC connector. Developed in the late 1940's as a miniature version of a type C connector, BNC stands for Bayonet Neill Concelman and is named after Amphenol engineer Carl Concelman. The BNC product line features two bayonet lugs on the female connector member, and mating is achieved with only a quarter turn of the coupling nut. Another standard connector for coax cables is known as an F connector. Both mating parts of the connector have hexagonal surfaces which engage to provide support for rotating drive. For either type connector it is necessary to drivingly force a longitudinal movement of the part being attached or removed, as well as providing a rotating drive.
Applicant's prior U.S. patent application Ser. No. 11/175,466 entitled OPTIMAL SELECTABLE FORCE IMPACT TOOL filed Jul. 5, 2005, shows a punch-down tool for which the downward or longitudinal driving force can be conveniently adjusted. The present invention is accomplished by modifying Applicant's punch-down tool, and also providing a modification of each of the BNC and F type insertion/removal tools.
The objective of the invention is to be able to conveniently connect, or disconnect, two longitudinal sections of coaxial cable. According to the present invention the drive head of the insertion or removal tool is longitudinally inserted into a hand tool such as a punch down tool, and is locked in place against both rotational and longitudinal movement. A punch down tool such as that shown in Applicant's prior application is modified to provide a cylindrical lower driving end, upon whose outer surface a circumferential groove is formed. A locking spring carried in the circumferential groove extends around most of the circumference of the punch down tool driving end. At one point along the circumferential groove there is a single hole through the wall, and the spring has an in-turned end which will engage the hole and be locked in it.
A removal tool is modified by forming in its drive head a longitudinal slot that has an upper end portion sloped to provide a ramp, and a lower end portion indented to form a detent. As the head of the removal tool is pushed upward into the hollow end of the punch-down tool driving end, the longitudinal slot in the drive head of the removal tool receives and engages the inturned end of the spring. Alternatively, the punch-down tool hollow lower driving end is pushed downward against the head of the removal tool into the longitudinal slot in the drive head of the removal tool, which receives and engages the inturned end of the spring. When the spring end point passes the high point in the slot (peak of the ramp of the removal tool) and drops down into the indentation (detent), the removal tool is then locked in place relative to the punch down tool driving end, rotationally and longitudinally. Now the tool assembly can be effectively used to either insert or remove a connector.
a, 1b, and 1c provide an artistic illustration of the manner in which the tool system of the present invention operates;
a, 2b, 3, 4a, 4b, 4c, 4d, 4e, 5a, and 5b illustrate the application of the invention to a BNC Removal Tool; and
a, 6b, 7, 8a and 8b illustrate application of the invention to an F Connector Removal Tool.
The Part Numbers and Names are as follows:
We now refer to drawings 1a, 1b, 1c, 2a, 2b, 3, 4a, 4b, 4c, 4d, 4e, 5a, 5b, 6a, 6b, 7, 8a, and 8b (eight drawing sheets) which collectively show both an insertion or removal tool 9 for a BNC Type Connector and an insertion/removal tool 19 for an F Type Connector.
With reference to
Item 9 is a BNC Connector Removal/Insertion tool. Its driving head is number 11, shank is 12, and tool body is 13. Item 17 is the outer conductor of a coax cable, the inner conductor being item 18. The lower end of the coax is secured in the female part 7 of a BNC type connector. The male half of the connector is item 8. The numeral 12 is the stem or handle of a tool 9, which is a BNC connector/removal tool. Numeral 13 is the tool body or three-quarter cylindrical shield that has to surround the coax cable section 17, 18 during operation of the tool. One section of coax cable extends upward from female member 7 of a BNC connector; member 8 is the male member, attached to another section of coax cable, not shown in the drawing.
Referring to
Referring to
b shows that the ramp which engages the inturned end of spring 4 has a peak at about ¾ or ⅞ of its length. The spring is held by punch-down tool 1. The head of the BNC connector tool 9 is inserted longitudinally up into the opening in the lower end of tool 1. The inturned end 6 of spring 4 rides up the longer and more gently sloped portion of the ramp 14; then passes the peak; and then clicks further into the radial hole 5 described above. When the spring clicks in, the stem or handle is not only locked in a longitudinal direction, but also against rotation in either direction. Now you can either connect or disconnect the BNC connector.
Referring to
a, 1b, and 1c artistically illustrate the operation of the present invention. Arrows 25 indicate that the driving tool 1 may have its hollow lower driving head 2 forced against the upper end 11 or 20 of an insertion/removal tool. Arrows 26 and 27 indicate that the driving tool 1 may be used to rotate the driven tool, 11 or 20, in either direction of rotation.
While this mechanical technique is shown applied to a particular kind of tool, it may also be used for other tools which require this type of drive; that is, the ability to apply force longitudinally downward, and to drivingly rotate the driven tool in either direction of rotation while doing so.
Although the presently preferred forms of my invention have been disclosed herein, it will be understood that other modifications should be apparent to those skilled in the art, and that the scope of my invention is to be judged only by the appended claims.
This application claims the priority of my Provisional Application Ser. No. 60/798,810 filed Apr. 5, 2006.
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|---|---|---|---|
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| 4241496 | Gregson | Dec 1980 | A |
| 5161301 | Kilsdonk | Nov 1992 | A |
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| 6712647 | Khemakhem et al. | Mar 2004 | B2 |
| Number | Date | Country | |
|---|---|---|---|
| 20070251086 A1 | Nov 2007 | US |
| Number | Date | Country | |
|---|---|---|---|
| 60789810 | Apr 2006 | US |
