US 3675182 A
The invention is a combination multiple wire termination block and wire stripper for use in electrical systems requiring a plurality of common connection points. A supporting body or block containing a rotatable metal shaft is secured to a chassis or other convenient support and the insulated wires to be connected are simply inserted in appropriate holes therein and the shaft rotated a fraction of a revolution to partially strip the wires and simultaneously force the bare ends between the internal sides of the block and the shaft, thereby making a common electrical connection. Counterrotation effects a disconnection.
Claims available in
Description (OCR text may contain errors)
United States Patent Gregory 1 1 July 4, 1972 s41 COMBINATION MULTIPLE WIRE FOREIGN PATENTS 0R APPLICATIONS TERMINATION BLOCK AND WIRE l9l,728 12/1906 Germany ..339/274 STRIPPER 1,149.685 4/1969 Great Britain ,.339/97 R  Inventor: David L. Gregory, Huntsville, Ala. Primary fimminer joseph H McGlynn  Assignee: Avco Corporation, Huntsville, Ala. Attorney-Charles M. Hogan  1 Appl 101338 The invention is a combination multiple wire termination block and wire stripper for use in electrical systems requiring a 521 11.5. c1. ..339/98, 81/95 c, 339/274 plurality of common conneclion Points A Supporting y or 151 Int. Cl ..l-l0lr 9/08 containi'lg a meta Shaft is a chassis  Field 61 Search ..339/95 97-99 or wwenien PP and insu'mcd wires be 339/274. 81/95 3 neeted are simply inserted in appropriate holes therein and the shaft rotated a fraction of a revolution to partially strip the 56 R f C-ted wires and simultaneously force the bare ends between the inl l e arenas I temal sides of the block and the shaft, thereby making a com- UNITED STATES PATENTS mon electrical connection. Counterrotation effects a discont' 3,042,896 7/1962 Doktor ..339/274 3,585,572 6/197l Krone et al ..339/97 R 4 Claims, 6 Drawing Figures Patented July 4, 1972 3,675,182
I NVEN TOR. DAVID L. GREGORY ATTORNEY COMBINATION MULTIPLE WIRE TERMINATION BLOCK AND WIRE STRIPPER SUMMARY The invention relates to the art of electrically connecting a number of lead wires to a common terminal in complex electrical systems such as telephone exchanges or computer systems. Where it is required to connect a large number of such leads to such a terminal, a technician must ordinarily first strip the insulation from the end of each lead and laboriously connect, by soldering or otherwise, each bared wire to the terminal or to a bus strip integral therewith. The invention provides a device which is sufiiciently simple and inexpensive that it may be attached to and made a permanent part of the support or chassis upon which the components of the system are affixed. The device enables the leads to be stripped and simultaneously connected to the common terminal by a simple mechanical manipulation and likewise permits disconnecting the leads from the terminal by a reversal of such manipulation.
A major object of the invention is to provide a simple, inexpensive, eflicient and practical assembly, which to some extent may be regarded as a tool, by which a plurality of insulated wire leads may be stripped simultaneously and quickly connected to a common terminal.
The prior art teaches the construction and operation of a number of efiicient wire strippers and connecting devices, usually constructed as separate tools. Such tools are manipulated by a technician from a position removed from the electrical assembly in which connections are to be made. When completed, such tool (or tools) does not become a part of the assembly but is put back in the technician's tool box for future use. A subsidiary object of the invention is to provide a tool which is sufficiently simple and inexpensive that it may be permanently attached to the assembly and yet be reusable at that point for effecting a disconnection of the leads from the terminal or rewiring the circuit with one or more new leads and for reconnecting the same or a replacement series of wires.
BRIEF DESCRIPTION OF THE DRAWINGS Other objects and advantages of the invention will appear when reference is had to the following specification and accompanying drawings, in which FIG. I is a perspective view of an illustrative device con structed in accordance with the invention;
FIG. 2 is a longitudinal cross-section taken through the center of the device with slots on the periphery of the internal rotatable shaft shown in one position;
FIG. 3 is a front view, in elevation, of the rotatable shaft alone with parts cut away and with the same turned to position 90 from that shown in FIG. 2, with the slots shown in another position;
FIG. 4 is a section taken along line 4 4 of FIG. 3;
FIG. 5 is an enlarged section similar to FIG. 4 with the shaft rotated 90 from the position shown in FIG. 4 with one wire shown in phantom lines and with part of the shalt-enclosing body illustrated, and
FIG. 6 is an exploded view of an alternative embodiment.
DETAILED DESCRIPTION Referring to FIG. 1, an illustrative device is shown in perspective as consisting of a support or block housing 10 which may be conveniently made of thermosetting plastic insulating material having dielectric properties, through which is extended a metal shaft 11 of brass or nickel-plated material partially joumalled in end blocks 10a and 10b, which are secured to blocks l0 by any convenient means.
The block 10 is secured to the chassis containing the related electrical equipment or to another convenient support, as shown in FIG. 2, so that torque applied to the shaft will not move the block. The block is bored or moulded to provide a cylindrical cavity or chamber for receiving shafl 11, the bore being slightly larger than the shaft to provide a slight clearance so that the shafi may rotate freely therein.
On one side of block 10 and extending therethrough are a plurality of spaced holes or ports bored to the overall diameter of the wires to be stripped and connected. The ends of these wires W are extended through these holes until they abut against an internal wall 19b of the shaft as shown in phantom lines in FIG. 5 and as will hereinafter be more particularly described.
In FIG. 2 is shown in longitudinal crow-section how shaft ll extends through block 10 and is rotatable therein, for instance, by turning the squared ends 12 or 13. After extending through end blocks 10:: and 10b shafi 11 comprises a cylinder 11a with enlarged cylindrical bearing portions 15 and 16 journalled at the end of the shaft-receiving cavity. Cylinder has a quadrant-shaped cut-out portion 19 as shown more clearly in FIGS. 3, 4 and 5. Extending laterally from one face of the cut-out are a plurality of grooves 18 of such size as to receive the ends of wires W when inserted through holes 14 in block 10, the holes being aligned with such grooves when the shaft is in operative position. One such groove, with one wire W extending therethrough until it is in abutment with the other face 19b of cut-out 19, is shown in detail in FIG. 5. The size of the grooves is determined so that the ends of the wires, with insulated covering thereon, will be compressed and fit snugly therein when the shaft is turned, as will now be described.
The device is operated by inserting from one to 10 (in the illustrative embodiment of FIGS. 1 to 5) unprepared insulated wires into the array of holes 14 until the ends abut the face 196 and then turning the shaft 90 by the use of a suitable tool at end 12 or I3. As the shaft is turned in the direction of the arrow in FIG. 5, the wires are squeezed into grooves 18 and gripped. As the rotation continues, the insulation is penetrated by the peripheries of grooves 18, the wires partially stripped, and the bared wires simultaneously forced between the sides of the cavity and the internal metal shaft, thereby making a common electrical connection. Since the wires are jammed in the space between the shaft and the block, the technician will feel a substantial reaction and will know that the device is operating properly. To remove the wires, the process is reversed and the shaft turned 90 in the opposite direction, afler which the wires can be easily removed.
An alternative device is shown in FIG. 6 comprising an integral plastic stamping such as one made of a phenolic condensation product 20 having a longitudinal entrance opening (not shown) through which may be inserted a shaft 21 in a direction at right angles to the longitudinal axis of the body of the stamping 20. At the ends of the stamping are extensions 20a and 20b having aligned slots 30 adapted to receive and form a bearing for the journal sections 25 and 26 of the shaft 21. The shaft 21 is provided with quadrantia] cut-out 29 having axial faces 29a and 29b in one of which are provided slots 28 similar to the slots 18 in the first embodiment, which are aligned with the longitudinally spaced openings 24 in the body 20.
Afier the shaft 21 is inserted in the body 20 a block 240 is fitted into the entrance opening previously noted and O-ring clamps 200 are placed in grooves 20d in the extensions 20a and 20b.
For convenience in operation, a knurled thumb crank or nut 22 is integrally formed at the end of shaft 21 so that the shaft may be turned to strip the wires and connect them into a common electric connection as above described.
In the embodiments shown, small pieces of insulation or device has been used a certain number of times, but this will have no deleterious eli'ect on the operation until the quadrant is filled. Should any installation require continuous connection and disconnection, the end faces 10a and 10b in the first embodiment and the plug 240 in the second, are removable, thereby making it possible to clear away such debris.
What 1 claim is:
l. A multiple wire temiination block and wire stripper comprising, in combination:
a supporting body,
said body being fonned with an interior cylindrical cavity,
and a metal shaft rotatable in said cavity,
said body being further formed with a plurality of holes extending radially towards said shaft,
said shafl being formed with a quadrant-shaped cut-out and slots adjacent thereto and cut in the periphery of the cylindrical surface of said shaft,
said slots being aligned with said holes and constituting means for gripping the ends of insulated wires inserted in said holes,
said shah having formations for turning it so that the wires are partially stripped and simultaneously electrically forced into intimate connection with said shaft.
2. The combination as claimed in claim 1 in which the body is constructed of a thermosetting resin having dielectric properties.
3. The combination as claimed in claim 1 in which the body has removable ends in which the shaft is joumalled.
4. A multiple wire termination block and stripper comprising, in combination:
a housing formed to provide end journals and an intermediate cylindrical chamber,
a metal shah having a body portion formed for rotation within said cylindrical chamber and end portions projecting through said journals,
said housing being formed with spaced ports adapted to receive the ends of wires and extending in a direction generally normal to said shafi,
said shaft being formed with a cut-out portion providing an abutment face against which said wires terminate when the shah is in wire-receiving position and an additional face then upstanding and parallel to the wires, together with slots in alignment with said ports extending transversely of the upstanding face and on the outer surface of said body, the spacing between said slots and the wall of said chamber being so proportioned that, when the shaft is turned in a direction to bend the wire ends, the wire ends are partially stripped and electrically formed into firm contact with said shaft.
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