anvil to accommodate the required wire or cable type
INSULATED WIRE CONTACT CLAMP and thickness.
When testing coaxial wires, a special pin or needle
BACKGROUND OF THE INVENTION will be used to prevent contact of the shielding in the
This invention relates to an electric wire contact 5 coaxial wire to the pin or needle as made evident in the
clamp for measuring in sets of 2 or more electrical con- description of the drawings.
ditions such as voltage, and resistance in electrical wires Similarly, when testing cords with 2 or more wires,
without removing the insulating material. the wire anvil will be adapted to permit positioning one
At present, when it is required to measure voltage wire at a time in order to perform the testing,
between 2 insulated electrical wires, it is necessary to 10 Finally, the pin or needle assembly may be adapted to
locate the sites where the wires are connected to do so. contain 2 or more adjusting screws with corresponding
But in many instances it is convenient to measure the pin or needles, with a corresponding anvil and 2 or
voltage in an insulated electrical wire at a distant loca- more external cables when becomes necessary to test
tion from a connection, in which case to perform the cords with 2 or more wires with a single clamp, by
test the insulation must removed and thereafter the 15 merely positioning the pins or needles in a diagonal
damage repaired. Besides being dangerous when testing fashion to prevent contact between adjacent adjusting
a wire when the power is on, it takes time to remove the screws and in alignment with the respective wires, insulation and do the repair work.
The clamp of this invention provides an efficient, safe BRIEF DESCRIPTION OF THE DRAWINGS and simple method to connect the insulated wire to the 20 with the above and other objects in view, as hereinaftest clamp, without any risk during the operation. ter appear, the advantages of the invention will be betIn the same fashion this invention provides a path for ter described and understood from the accompanying easily measuring the resistance between different insu- drawings illustrating the invention, in which: lated wires when the power is off. FIG 1_is a perspective view of the clamp of this
In the case where the voltage, or resistance is to be 25 jnVention
measured between insulated wires and ground or chas- FIG 2_is a sectional view of the clamp taken along
sis, the clamp of this invention will save time in per- jong J_j Qf FjG j
forming these tests. F1G 3_is ^ enlarged sectional plan view of the pin
SUMMARY OF THE INVENTION 30 or needle supporting jaw taken along line 2—2 of FIG.
It is an object of this invention to provide an insulated ^' . . , , .. , . e
4ti * u J- FIG. 4—is an enlarged sectional plan view of the
electrical wire contact clamp that may be used singu- .. • ,,■■>■, rr-x^
, .,, , r - _ r , __ °. wire anvil supporting jaw taken along line 3—3 of FIG.
larly or in sets of 2 or more to measure voltage and . vy 6J 6
resistance in electrical circuits without removing the '_T _ .... , . ,
insulation of the wire. 35 Fla 5~1S a slde perspective view partly m section of
It is another object of the invention to provide adjust- the Pin,or needle assembly and wire anvil supporting
able means in the clamp to accommodate different sizes Jaws of the invention in use with a cross section of an
of pins or needles according to the type of wire insula- insulted wire, showing the perforated insulation and the
tion and wire metallic core. It is yet another object of Pln or needle m contact with the metallic core of the
the invention to provide adjustable means in the clamp 40 wlre or cable as well as the connection of the pin or
to accommodate different thicknesses and types of wire needle to the core of the cable that emerges from the
to be tested. end of the corresponding handle and to be connected to
The objects set forth herein and others which will an electrical measuring apparatus,
become apparent hereinafter are accomplished by the FIG- 6—is an enlarged side perspective view of a
provision of a pliers-like clamp made on non-conduct- 45 universal anvil which may be installed in the anvil jaw
ing material such as plastics, with a pair of jaws which for testing cords with 2 or more wires, by testing one
are in a parallel arrangement to each other whenever wire at a time.
the handles are clamped together. FIG- 7—is an enlarged sectional view of the wire
One of the jaws has a section for supporting the per- anvil of FIG. 6 taken along lines 4—4, with a 2- wire
forating pin or needle assembly whereas the other of the 50 cofd in position.
jaws has a section to support an assembly to hold the FIG. 8—is an enlarged sectional view of an adjusting insulated wire in position in an "U" shaped anvil top screw fitted with a special pin or needle coated with a surface, with a hole in its center to provide a path for ceramic or insulating abrasion resistant coating except the pin or needle in case that the pin or needle protrudes at its end tip for use in testing coaxial cables, beyond the thickness of the wire, thus preventing break- 55 FIG. 9—is an enlarged sectional view of an insulated age of the pin or needle. coaxial wire showing the pin or needle of FIG. 8 conIn addition, means are provided to connect the pin or tacting only the core of the coaxial wire.
needle to a cable which extends from the clamp itself to T-»t?-t- » It rn ... -rur
. '» j * _: » i * • i * DETAILED DESCRIPTION OF THE
be connected to the appropriate electrical testing equip- nwAWTNPS
ment. When reference is made in this invention, to a pin 60
or needle, it is understood that the pin or needle assem- The illustrated embodiment of the invention com
bly is capable of accommodating the type of pin or prises a gripping clamp 10 for connecting the metal core
needle required for a given insulated wire or cable so of insulated wires or cables to electrical equipment for
that the perforation is minimum. measuring voltage, and resistance by using the required
In essence, this invention provides a clamp capable of 65 number of clamps to be attached to each wire or cable
accepting different types and thicknesses of insulated in an electrical circuit.
wires or cables by simply changing the adjusting screw The clamp 10 includes elongated members 11 and 12
that supports the pin or needle and/or changing the pivotally connected to form a pliers-like clamp 10.