US 1204457 A
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Description (OCR text may contain errors)
A. L. KREEFT.
ELECTRIC BINDING POST.
APPLICATION FILED MAY 4.1914.
Patented Nov. 14, 1916.
AECHIBALD LEWIS KREEFT, OF WEST ORANGE, NEW JERSEY.
Specification 0! Letters Patent.
Patented Nov. 14, 1916.
Application filed May 4, 1914. Seriallio. 836,090.
I '0 all whom it may concern Be it known that I, ARCHIBALD LEwIs KREEr'r, a citizen of the United States, and a resident of the town of West Orange, in the county of Essex, State of New Jersey, have invented certain new and useful Improvements in Electric Binding-Posts Used for Electrical Connections.
The object of my invention is to provide a convenient and ready means of holding a wire in electrical connection with an adjacent metal part, and comprises the use of continuous spring pressure upon the wire instead of screws for such purpose.
The following is a. description of the design and construction of my new device,
reference being had to the accompanying drawings.
Figure 1 is an outside elevation of my binding post; Fig. 2 is a longitudinal cross section of the same; Fig. 3 is a. longitudinal section taken at wa of Fig. 1, showing wire in place; Fig. 4 is a modified form with insulating sleeves; Fig. 5 is'a detached view of the plunger.
Referring to Fig. 1, the body or main piece of the binding post is indicated by the letter A, which may be made of brass, copper or other metal and in any desired form, such as round, square, or hexagonal. In the drawings I have shown the preferred form which is round. At B, is shown a plunger mounted loosely inside the body A, as shown in Fig. 2, and adapted to slide therein. This plunger can be made of brass, copper or other metal and in various forms such as round, square, or hexagonal. The outer casing or body A is pierced on opposite sides thereof with holes or openings C, C, to receive a. bare wire. These holes C, C, are made in various sizes or diameters to accommodate the size and the carrying capacity of the wire to be used therewith. The lower part b of the plunger B, rests on a strong spiral spring D, which fits in the lower portion of the casing A, and rests on the bottom thereof. The lower part of the plunger is preferably made of a larger diameter than the top 0 which passes out of the upper end of the casing for ready manipulation when it is desired to connect or disconnect a wire. At the base of the casing is shown a tapped hole 6 which is threaded and intended to receive a screw to make the inechanical and. electrical connection between the apparatus delivering or receiving the current and the binding post. Other con- .venient means may be used instead of this tapped hole to make such connections. It will be understood that the base of the easmg A, at a, is to be entirely closed except where pierced at e, for the reception of a screw, so thatwhen the binding post is in position on the screw there is no aperture through the bottom to the interior chamber of the casing to admit dust or grease. The lower part b of the plunger is transversely bored with a hole h which is the same di' ameter as the holes 0 in the casing or body A.
Referring to Fig. 2 it will be seen that while the spring D is normal the hole It does not coincide with the holes C, C, but
when a downward pressure is exerted on the plunger it compresses the spring and brings the holes in the plunger andcasing in alinement. This permits of the end of a bare wire d being readily inserted through the holes C, C, and hole 71., so it passes through the entire device as shown at Fig. 3. When pressure is released from the plunger the wire is held in contact with the plunger and both sides of the casing by the action of the spring. With this method oi making contact itis impossible to pull the wire out with any reasonable amount of force. After the plunger and spring are assembled in the casing the top of the case is peened over or pressed together as shown at thus making the whole binding post sel contained with no loose parts such as a screw 'to be mounted or adjusted when making electrical connections, the actuating spring in such construction being housed in the casing and protected from dirt.
In Fig. at is shown a longitudinal section of binding post showing an insulation or covering 9' of rubber, fiber or other material. When the plunger and the interior of the casing are circular in form a slot or a longinal groove 2' may be made in the upper part c of the plunger and a projection in on the casing to slide therein so as to assure the registering of the hole It with the openings in the casing.
This post can be used for various classes of service and is adapted for general use where a quick and positive electrical conthree elements which are held together adter assembling as described, comprising a hollow shell, a spiral spring contained therein which rests upon the interior bottom thereof, a. plunger resting on the spring and terminating in an exterior end of reduced diameter, said casing being peened around the reduced diameter of the plunger afterintroduction of the other two elements to conlofine them therein, said plunger and casing being pierced with registering holes which form an open passage Way through both, when the plunger is pressed down which passage is closed when pressure is removed,
substantially as and for the purposes shown and described.
ARCHIBALD LEWIS KREEFT. Witnesses:
OTTO FAIRFIELD HUMPHREYS, WILLIAM L. RAMAGE.