US 3609644 A
Description (OCR text may contain errors)
United States Patent inventor Appl. No.
Filed Patented Assignee William J. Seim St. Paul, Minn.
Oct. 20, 1969 Sept. 28, 1971 Minnesota Mining and Manufacturing Company St. Paul, Minn.
MAIN FRAME CONNECTOR AND METHOD 2 Claims, 10 Drawing Figs.
u.s. CI 339/98 Int. Cl H0lr 9/08 Field of Search 339/97-99  References Cited UNITED STATES PATENTS 3,012,219 12/1961 Levin et al.
3,118,715 1/1964 Potruch 3,189,863 6/1965 Leach 3,434,093 3/1969 Wedekind 3,500,292 3/ 1970 Enright et a1.
Primary Examiner-Joseph H. McGlynn Attorney-Kinney, Alexander, Sell, Steldt & Delahunt ABSTRACT: A solderless connector for making spring reserve electrical contact between a main frame post and a pair of insulated wires in a communications installation.
MAIN FRAME CONNECTOR AND METHOD This invention relates to solderless wire-connectors and in particular to connectors for use in attaching insulated wires to the contact posts of a telephone main frame assembly.
The conventional procedure for attaching communication cable insulated wires to main frame posts is to strip the wire ends and then make a wrap-and-solder connection. The present invention eliminates the need for wire-stripping and soldering, greatly simplifies the operation of making connection between wires and posts, adds an insulating covering to such connectors, and provides trouble-free spring reserve electrical connection between post and wires.
In the drawing,
FIG. 1 is an exploded view of the connector in perspective,
FIG. 2A is a longitudinal section of the body and contact member, and 28 a similar section of the cover member taken at line 22 of FIG. 1,
FIG. 3A is a transverse section of the body member, and 3B of the cover member, at line 3-3 of FIG. 1,
FIG. 4A is a transverse section of the body member, and 4B of the cover member, at line 4-4 of FIG. 1,
FIG. 5 is an end view of the cover member from the wire entry end,
FIG. 6 is an end view of the body member from the wire entry end, and
FIG. 7 is an end view of the body member from the post entry end.
As will be seen from FIG. 1, the connector consists of a body 10, a cover 11, and a contact element 12, the components being shown in exploded view and with the cover member turned at right angles to its normal position.
The body 10 is in the form of an open top hollow boxlike structure having sidewalls 13, 14 and end walls 15, 16. The sidewalls slope inwardly towards the open top. The interior of the body is transversely slotted to provide a narrow slot 17 near the end wall 16. The body member is also slotted at the opposite end to fonn an open slot 18 connecting with the open interior and of dimensions suitable for entry of a main frame soldering post. Triangularly cross-sectioned projections 19, 20, and 21 extend inwardly from walls 13, 14 and respectively, with their lower surfaces in line with the upper level of the slot 18, and parallel with the corresponding segments 43, 44 of the open-centered bottom of said body. The projections 19, terminate short of the slot 17 to permit entry of the contact element during assembly.
The front wall 16 of the body member 10 is provided with a generally W-shaped opening 22 as more clearly shown in FIG. 6, the two lobes 23 and 24 defining the position of the wire ends to be inserted within the connector. The lower portion of the wall 16 is inset, as shown most particularly in FIG. 2A, with its inner surface in close proximity to the slot 17.
The cover member 11 fits within, and flush with the open top of, the body 10 when the connector is applied to a wire pair, but is initially retained in the extended or open position by outwardly slanted resilient side extensions 25, 26 which make contact with the slanted inner sidewalls ofthe body. In closed position the slanted sidewalls of the cover fit snugly against the slanted sidewalls of the body. The cover is transversely slotted to provide a narrow slot 27 in line with the slot 17 of body 10, and has parallel longitudinal channels 28, 29 separated by a central extension 30 and extended through the forward portion 31 of the cover as circular openings 32, 33. Thin sections 34, 35 of the insulating material of which the part is constructed extend across the opposite or inner ends of the open channels 28 and 29.
The contact member 12 consists of a wire-connecting flat plate portion 36 fitting within the slots 17 and 27 in the body and cover members respectively and doubly slotted to provide open-ended wire-receiving slots 37, 38 in line with the channels 28, 29. Extending from the opposite end of the contact element is a bowed post-contacting plate portion 39, consisting of an upwardly slanted connecting intermediate portion 40 and a downwardly slanted tip portion 41, and which fits beneath extensions 19, 20 and against bottom se ents 43, 44 when the plate 36 is inserted within the slot 1 A centrally offset segment 42 near the base of the contact element 36 assists in anchoring the element within the body by making gouging contact with the inner surface of the inset portion of the front wall 16.
Water-resistant greases, preferably silicone grease, may be placed within the body member if desired, to serve as a further insulating and protective agency. The sliding contact required between contact element and the wire ends and contact port during installation assures displacement of the grease from contact surfaces and results in full electrical contact.
With the three components assembled as indicated, and with the cover member supported above the body member in the open position, the wire ends to be connected are merely inserted through the openings 32, 33 and against the plates 34, 35, and the cover is then forced into the body by means of a suitable pliers of similar compression tool. The cover snaps into position as in the slanted edges of the cover are forced between the slanted sidewalls of the body, and the wires are forced into the slots 37, 38 and against the spring reserve tension of the resilient element 36. The closed connector is then forcefully slid onto the appropriate solder post of the main frame, the post entering within the slot 28 and against the lower surface of the wedges 19-21 and making effective sliding contact with the resilient plate 39. Single-wire connections are similarly made in circuits where two wires are not required.
A typical connector made in accordance with the preceding description has overall dimensions, in closed form as applied to the wire ends, of 0.235 X 0.320 X 0.540 inch. The body and cover will typically be injection molded from tough electrically insulating polycarbonate or other plastic material. The element 12 is desirably formed of No. 26 cartridge brass; the wire contact plate 36 is 0.180 X0.238 inch, and the bowed plate member 39 extends 0.300 inch from the plate. A connector made to such dimensions will accept No. 22-24 plastic covered copper wires and will fit a 1132 X 7/32 inch post as used on many main frame assemblies.
What is claimed is as follows:
1. A connector for making in-line solderless electrical connection in a communications installation between a pair of insulated wires and a main frame flat post, said connector comprising: an open top hollow insulating body member having inwardly slanted sidewalls, inwardly transversely slotted to provide a transverse narrow slot near one end for receiving a spring reserve wire contact element, and slotted to provide an open slot at the other end for receiving a said post, said body including projecting ledges extending inwardly along both sidewalls for supporting a post inserted through said end slot; a cover member fitting into the open top of said body member in both open and shut positions, longitudinally channeled to provide a pair of parallel wire-supporting surfaces, and transversely slotted across said wire-supporting surfaces to provide an inner narrow transverse slot in line with the transverse slot in said body member; and a spring reserve contact element disposed within said body member; and a spring reserve contact element disposed within said body member, having a wire-connecting flat plate portion fitting within said transverse slots of said body and cover and across said wire-supporting surfaces and slotted to provide an open-ended wire-accepting slot in line with each of said surfaces, and a port-contacting portion toward said post-receiving slot in said body member for making spring-reserve sliding contact with a said post.
2. Method of connecting insulated wires to a main frame post comprising inserting a wire-end into an open connector as described in claim 1 and closing said connector to make spring reserve contact between said wire-end and said contact element, and slidably mounting said connector on said post.
UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3,6o9,6 'r Dated September 28, 1971 Inventor(s) William J Se im It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:
Column 2, line 12, "port" should be "post" Column 2, line 20, "oi" should be or u H u n V Column line 2i, after and before thn delete in Column 2, line 5S-59, delete "und a spring reserve Contact clement disposed with in said body member;
Column 2, line 1 delete portr-conwcting, portion and insert post-contucting bowed plate portion extending from said wire-connecting port ion-- Signed and sealed this 21st day of March 1972.
EDWARD M.FLETCHER JR. ROBERT GOTTSCHALK Attesting Officer Commissioner of Patents *ORM P0-1050 (10-69) USCOMM-DC 80376-P69 USv GOVERNMENT PRINTING OFFICE: IQ, O-lU-Jll