US1162354A - Connecting device. - Google Patents

Description

H. A. HART.

CONNECTING DEVICE. APPLICATION FILED APR. 27. I915.

Patented Nov. 30, 1915.

} Witness N I I Qwvintoz 7 y "MA/1 -z Q W 5 f I i F ICE.

HAROLD A. HART, or HARTFORD, CONNECTICUT.

CONNECTING DEVICE.

Specification of Letters Patent. Patnfed Nov. 30,1915.

Application filed April 27, 1915. Serial No. 24,235.

To all whom it may concern:

.- Be it known that I, HAROLD A. HART, a

citizen of the United States, residing at Hartford, county of Hartford, State of Connecticut, have'invented certain new and useful Improvements in connectin'g Devices,

of which the following is a full, clear, and

device the plug of which can be used-in receptacles already in use.

The following is a description of my invention, reference being had to the accom- I panying drawings, in ,which,-' i

Figure 1 shows a plan view of the base with the plug, minus the cap, inserted. Fig. 2 is a section on the line 22, Fig. 1. Fig. 3 is a diagram showingfthe relations of the threads on the plug. Fig. 4 is a perspective detail of the base showing the thread thereon. Fig. 5 is a perspective view of the threaded portion of the plug.

Referring more particularly to the drawings, 1 .is a base block having securing ears 2, 2. Y

3' is a metallic shell within which is an interrupted or quartered screw threaded metallic portion- 4. Located axially within the shell is an inner metallic terminal 5, mounted on the base block. 6 and 7 are binding posts electrically connected to the; terminal 5 and the screw threaded portion ,4, respectively, as shown in dots in Fig. 1.

Theconstruction so far described, if the portion 4 were not quartered, would be substantially the old construction" of base receptacles.

8 is a porcelain core for the plug. Mounted on this core is a metallic member'9 having interrupted or quartered screw threaded surfaces 10 and 11 presenting independent surfaces engaging the screw threads on the base as hereinafter described. Each of thesesurfaces has portions of a thread of the same pitch as the thread in the portion 4C. In the form shown the threading on the plug is sectioned or interrupted by the recessed portions 12,12. Thecore carries an axially located metallic contact piece 18 which is' connected to an external circuit terminal 11,. The metallic member 9 is electrically connected to a corresponding eX- ternal circuit terminal 15. The external circu it terminals 1-1 and 15 are adapted to re-v .ceive two plugs from. anordinary detachable cord, and constitute no partof my invention.

16 is a cap member secured in place by a. screw passing through the same and the core and into the contact 13, and has the usual openings for the plugs connected to the removable cord.

IVith my plug and socket each having into the receptacle by a longitudinal movement so that when the contact 13 is in engagement with the inner terminal 5 it can be tightened up by a partial turn, which causes the screw threads to engage and draw the contact 13 into closer engagement with the inner terminal 5 on the :base block, thus establishing proper electrical connections between the binding posts 6, 7 and the clipterminals 1d and 15. This is a very simple and convenient arrangement for securing the plug in the base receptacle. I have found, however, that my improvement just -described is open to the objection that unless the plug is held in a certain angular position when inserted longitudinally the quartered threads the plug can be inserted thread of the plug will not engage with the thread of, the base so as to properly secure the plug by a quarter turn of the plug. In

' order to remove this objection I provide the plug with a plurality of threads of the same pitch as the thread on the base and equally subdividing the. engaging "surface on the plug. VVith such a plurality of threads there is always a thread on the plug which is in position to' easily engage the thread on the base receptacle, so that when the terminals '5 and 13 are brought into engagement with each other by a longitudinal movement of the plug a quarter turn of the plug willalways secure thev plug in proper position, as shown in Figs. 1 and 2. I have found that two such threads, 17, 18, are suflicient.

In a double threaded plug the threads, if complete, would be as. shown in Fig. 3, the two threads being parallel and beginning at diametrically opposite points in "the same plane, so that the two points lying in any plane perpendicular to the axis of the plug and belong'ingto different threads are at diametrically opposite points relatively to said plug. Fig. 3 shows one of two threads in full lines and the other in dots.

In forming what I call interrupted or quartered screw threaded portions, I remove or recess parts of the members carrying those portions along paths parallel to the.

thereof of the scope of the appended claims.

What I claim is: a 41. In an electrical connecting device, the

combination of a receptacle having a quar- 'tered 11113811131 SCI'GWjhI'GHd and an axially located inner terminal, and a plug having a quartered screw threaded portion and an to said plug.

end contact engaging said internal screw thread and. inner terminal respectively, said quartered screw threaded portion having two parallel threads of substantially the same pitch as the said internal screw thread;

2. In an electrical connecting device, the combination of a receptacle having a quartered internal'screw thread and aninner terminal, and a plug having a quartered screw threaded portion and an endcontact for en-- gaging said internal screw thread and inner terminal respectively, said quartered screw threaded portion having two parallel threads of substantially the same pitch as the said internal screw thread, the portions of said two threads lying in the same plane being at diametrically opposite points relatively HAROLD A. HART. lVitnesses SYLVIA' C. Mooor,

SAMUEL F. MEYER.

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