US1236057A

US1236057A - Separable attachment-plug.

Info

Publication number: US1236057A
Application number: US75913813A
Authority: US
Inventors: Charles G Cope
Original assignee: Benjamin Electric Manufacturing Co
Current assignee: Benjamin Electric Manufacturing Co
Priority date: 1913-04-05
Filing date: 1913-04-05
Publication date: 1917-08-07
Anticipated expiration: 1934-08-07

Description

C. G. COPE.

SEPARABLE ATTACHMENT PLUG. APPLICATION FILED APR. 5, ma.

Patented Aug. 7,1917.

CHARLES G. COPE, OF CHICAGO, ILLINOIS, ASSIGNOR T0 BENJAMIN ELECTRIC MFG. COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

SEPABABLE ATTACHMENT-PLUG.

To all whom it may concern:

Be it known that 1, CHARLES G. COPE, a subject of the King of Great Britain, residing at Chicago, in the county of Cook and State of Illinois, have invented new and useful Improvements in Separable Attachment-Plugs, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawing, forming a part of this specification.

My invention pertains to separable attachment plugs, that is to say, to plugs of the kind which comprise an insertible member adapted to be screwed into a lamp socket or the like, and a binding-terminal carrying member which is separably connected with the insertible member. It is the principal object of my invention to simplify the construction of plugs of this character, as well as to provide a plug which will be convenient and safe in use.

A separable attachment plug constructed in accordance with my invention is described, by way of example, in the following specification and shown in the accompanying drawing, in which:

-Figure'1 is a longitudinal section through the plug, showing the insertible mem er and the binding-terminal carrying member in their connected condition, the section being taken on the line 11 of Fig. 3;

Fig. 2 shows a portion of the insertible member in side elevation and shows the binding-terminal carrying member in longitudinal section, such section being taken on the line 22 of Fig. 3. r

Fig. 3 is a plan of the binding terminal carrying member, and

Fig. 4 is a section on the line 44 of Fig. 1 looking in the'direction of the arrows.

Referring now to the drawing, the insertible member comprises a threaded contact 10 having molded on the lower end thereof an insulating thumb ring 11. The threaded contact is formed with an inwardl extending flange 12 just above the thumb ring 11 and with a second inwardly extending flange 13 at its top end. An insulating block 14 is contained between the

flanges

12 and 13, and is of such diameter as to fit snugly into the threaded contact 10 while still permitting of free relative rotation between itself and the threaded contact. The insulating block 14 is formed with an extension 15 of reduced diameter which termi- Specification of Letters Patent.

' 26, a binding plate 27 carrying Patented Aug. 7, 1917.

Application filed April 5, 1913. Serial No. 759,138.

nates' flush with the lower face of the insulating ring 11, thereby producing an annular chamber 16 within the inner edge of the ring 11. The threaded contact 10 is formed with a neck which extends downwardly at the inside of the ring 11, the lower portion, 17, of this neck being imbedded in the material of the ring 11 so as to be hidden and protected thereby. The upper portion, 18, of this neck is exposed and is formed into a hollow bead for receiving the spring contacts of the binding-terminal carrying member, in the manner described below.

The insulating block 14 is formed, at its lower end, with a central rectangular chamber 19 which contains a forked spring contact 20. The forked contact 20 has the ends 21 thereof flared outwardly to receive the center contact of the binding-terminal carrying member. The contact 20 is clamped in position by means of a nut 22 which receives a screw 23 which passes longitudinally through the insulating block 14. A dished washer 24 is clamped between the head of the screw 23 and the top end of the block 14, this washer forming the center contact of the insertible member.

The binding-terminal carrying member of the plug comprises an insulating base 25 having secured thereto, by means of a screw a binding screw 28. The binding plate is bent to form an upwardly extending flat shank 29 situated centrally of the base 25, the upper end of which shank is bent to form a wedge shaped head 30. The shank 29 and the head 30 are of such length that the head will enter between the outwardly flared ends 21 of the forked contact 20, forcing them apart, when the binding-terminal carrying member is connected with the insertible member, whereby connection is made between the center contact 24 of the insertible member and the binding screw 28 of the binding-terminal tending spring contact tongues 35, each of which is bent to form a rounded head 36. The length and position of the tongues 35 is such that their heads will snap into the hollow bead 18 of the insertible member when the binding-terminal carrying member is thrust toward the insertible member. The tongues 35 perform the mechanical function of releasably connecting the binding-terminal carrying member with the insertible member, and at the same time make electrical connection with the binding screw 34 and the threaded contact 10.

The insulating base 25 has a conductor-re ceiving passage 37 formed therethrough, which passage connects, by a channel 38, with the binding screw 28. The insulating base is also formed with a second passage 39 being opposed diametrlcally 39 for permitting a conductor to be brought to the binding screw 34, the passages 37 and to each other. The cap 31 is provided w1th a down wardly extending threaded neck 40, into which is screwed an insulating bushing 41 having a central aperture 42 for permitting the passage of the conductors therethrough. The bushing 41 is formed with an upwardly extending flange '43 which'surrounds the cap 31 and base 25 when the bushing is screwed into the neck 40. When the bushing is screwed into the neck 40 its upper edge clamps the conductors leading from the

binding screws

28 and 34 against the lower part of the base 25, whereby the binding screwsare relieved from all strain.

When the insertible member is connected with the binding-terminal carrying member, the threaded contact 10 may be rotated with respect to the remainder of the plug, whereby insertion of the plug into a socket is facilitated. and twisting of the conductors avoided. By reason of the shape of the contact head 30 and forked contact 20, the insulating block 14 remains stationary with respect to the binding-terminal carrying member, the blockthus becoming clamped into the. socket when the threaded contact 10 is screwed firmly therein. The binding-terminal carrying member can be separated from the insertible member, or connected thereto, with great ease, itbeing only necessary to overcome the resiliency of the sprin contacts 35. The shape and arrangement 0 i the parts is such that the binding-terminal carrying member will be separated from the insertible member whenever a pull is exercised on the conductors, regardless of the direction in which said pull may be applied. When the binding-terminal carrying member is removed from the insertible member, the extension 15 of the base 14 separates the forked contact 20 from the neck 17 of the threaded contact 10, thus preventing these contacts from being bridged by reason of a conducting member being accidentally put into the insertible member. Similar accidents due to a person touching both of the contacts of the insertible member simultaneously are prevented. By reason of the fact that the contact 20 terminates considerably short of the mouth of the chamber,

it would be very diflicult to touch this contremely simple construction and may beplaced on the market at a low cost.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is 1. A separable attachment plug comprising an insertible member including an insulating block, and a threaded contact mounted to rotate with respect to said block and having an exposed annular portion; and an insulating binding-terminal carrying member separably connected with said insertible member and a contact slidably engaging the annular portion of said rotatable threadedcontact when the members are connected together, said slidable contact being supported by said binding terminal carrying member.

2. A separable attachment plug comprising an insertible member including an insulating block, and a threaded contact mounted to rotate with respect to said block and having an exposed annular portion; and a binding-terminal carrying member separably connected with said insertible member and including a contact slidably engaging the annular portion of said rotatable threaded contact when the members are connected v together, and means for preventing relative rotation between said binding-terminal car-' rying member andsaid insulating block.

3. A separable attachment plug comprising an insertible member including an insulating block having a reduced extension at its lower end said extension having an aperture therein, a threaded contact mounted to rotate with respect to said block and having an exposed portion opposite said exten-' sion, and a contact mounted in said aperture; and a binding-terminal carrying mem ber separably connected with said insertible member and including a contact entering between said extension and said threaded contact and slidably engaging the exposed portion of the latter when the members are connected together, and a second contact entering said aperture and'engaging'the'contact therein.

4. A separable attachment plug comprising an insertible member including an in sulating block having a reduced extension at its lower end said extension having .an aperture therein, a threaded contact mounted to rotate with respect to said block and having an exposed portion opposite said extension, and a contact mounted in said aperture; and a binding-terminal carrying member separably connected with said insertible member and including a contact entering between said extension and said threaded contact and slidably engaging the exposed portion of the latter when the members are connected together, and a second contact entering said aperture and engaging the contact therein, said second contact engaging the walls of said aperture, said contact and walls being shaped to prevent relative rotation between said binding-terminal carrying member and said insulating block.

5. An attachment plug comprising an insulating block, center and shell contacts carried by said block, said block having an axial recess therein, a contact in said recess connected with said center contact, said block having a recess therein off-set from the axis thereof and a wall separating said axial and ofi-set recesses and a contact from said off-set recess connected with said shell contact, neither of the contacts insaid recesses extending outwardly beyond the wall separating them, an insulating handle portion, and contacts supported thereby extending into said recesses, respectively, forquick detachable engagement with the contacts therein. I

In witness whereof, I have hereunto subscribed my name in the presence of two wit nesses.

i CHARLES G. COPE.

Witnesses I J OHN TAYLOR, ANNE SoLoMoN.