US1860546A - Electric fitting - Google Patents

Description

May 31, 1932. l.. B. MANsoN ELECTRIC FITTING Filed Feb. s, 195o Patented May 31, 1,932

UNITED STATES PATENT OFFICE LEON B. MANSON, OF CORONA, NEW YORK1 ASSIGNORS T0 NOMA ELECTRIC CORPORA- TION, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK rimarcare FITTING Application ,med February 6, 1930. Serial No. 426,239.

This invention relates to electric fittings. An object of this invention is to provide a fitting4 of the character described having imc proved quickly replaceable fuse cartridge means interposed in the current carrying portions of the fitting.

A further object of this invention is to pro- `'vide a fitting of the character described having improved means for removably mounting all the current carrying portlons of the fitting as a single unit within a single housstill further object of this invention is to provide a neat, compact and rugged device of the character described, which shall be comparatively inexpensive to manufacture, com prise fewand simple parts, easy to assemble and replace, and which shall yet be practical and efficient to a. high degree.

Other objects of this invention will in part be obvious and in part hereinafter pointed out.

The invention accordingly consists in the features or construction, combinations of elements, and arrangement of parts which will be exemplified in the construction hereinafter described, and of which the scope of application will be indicated in the following claims.`

In the accompanying drawings, in which is shown one of the various possible illustrative embodiments of this invention, Fig. 1 is an axial cross-sectional view of the fitting embodying the invention;

Fig. 2 is a cross-sectional view taken on line 2-2 of Fig. 1; A

Fig. 3 is a cross-sectional view taken on line 3 3 of Fig. I2; and

Fig. 4 is a perspective View of the removable unit mounting the current carrying portions of the fitting.

Referring now in detail to the drawings, 10 designates an electric fitting embodying the invention here shown in the form of a two-piece plug, comprising a screw plug 11 provided with the usual parallel openings 12 for receiving the contact members or blades 14 and 15 of a blade plug 16.

The plug 16 comprises a tubular housing 17 made of any suitable insulating material rear end wall 19 formed with a central opcen- 1ng20. A cyllndrical ortion of the interior y mdrlcal surface o said housing 17 is threaded as at 21 for the purpose hereinafter described.

In accordance with this invention, all of the current carrying parts for the plug 16 are mounted on a single block and form a unltary device adapted for removable attachment, in the manner hereinafter appearing, as a single complete unit within the housing 17. Said unit, designated by the reference numeral 25, comprises the block 26 made of insulating material and provided with threaded portions 27 and 28 at the ends thereof adapted to cooperate with the internal threads 21 of the housing 17 Thus, when the block 26 is screwed to the threaded portion 21 of the housing as shown in Fig. 1, the formerforms a diametric, longitudinal partition or wall across the interior of said housing and provides space on both sides thereof and at the rear and front thereof, for the purpose hereinafter described. Said block may be provided with a pair of symmetrical recesses or cut out portions 30 and 31 at the ends of the rear surface thereof and withv symmetrical recesses 32 and 33 at the ends of the front surface thereof. Attached to said block 26 are av pair of symmetrical angular shaped, rearwardly extending metal current carrying terminal members 35 and 36 having legs 35a and 36a, respectively, disposed within the recesses 30 and 31. Screws 37 and 38 passing thru suitable openings in legs 35a and 36a, respectively, serve to fix said members 35 and 36 to the block. The outwardly extending legs 356 and 36?; of members 35 and 36 respectively, are formed with suitable openings for receiving small screws 40 and 41 for attaching the conductors 40a and 41a of a duplex cable 42 to the fitting. It will be noted that the cable 42 extends into the housing 17 thru the opening 2() in the rear wall 19. Attached to the opposite side of the block are the plug blades 14 and 15, as by screws 44 and 45 extending thru legs 14a and 15a of said blades, said legs being received in the cut out portions 32 and preferably open at one end 18 and having a 33 respectively of said block.

Said unit 25 is furthermore provided with quickly replaceable fuse means 50 on one side of the block, interconnecting the plug blade 15 with current carrying member 35 and fusc means 51 on the other side of said block, interconnecting the plug blade 14 with the curront carrying member 36. Said means 50 and 51 are substantially similar in construction and symmetrically disposed with respect to one another. Means 50 comprises a thin metallic bent strip 52 having an arm 53 interposed between said leg 35a and the insulatingr block 26, a portion 53a lying flat against a side of the block, and a pair of bifurcated spring clamping arms 54 extending at right angles to said block. A member 52a similar in construction to said member 52 is electrically connected to the plug blade 15 and is likewise provided with aportion interposed between the leg 15a of said blade and the insulating block 26, a portion lying flat against the side wall ofthe block and a pair of spring arms aligned with said spring arms 54. A fuse cartridge 55 provided with metal caps at the ends thereof is removably attached to the unit 25 as b v pressing said caps into engagement with the spring arms of said members 52, 52a. The fuse means 51 is likewise provided with metallic bent strip members connected to the member 36 and the plug blade 14 on the opposite side of the block and is also provided with a removable fuse cartridge 52a similarly clamped and frictionally retained against the side of said block 26.

In practice, the blade unit 25 may be first assembled into a separate compact device. To assemble the plug 16, the conductor cable 42 is first inserted thru the opening 30 and attached to the screw members 40 and 41 and the block 26 thereafter screwed to the interior of the housing. Should one or both of the fuses blow the entire unit 25 may easily be removed by unscrewing from the housing 17 and the burnt out fuses replaced. An insulating disc or plate having openings 61 for receiving the blades 14 and 15 may be interposed between the plugs 11 and 16, said disc preferably extending within the rim of the housing 17 at the end 18 thereof.

It will be noted that the fuse cartridges 55 and 55a are disposed on both sides of the block 26 and extend laterally with respect to the axis of housing 17, thus making for a compact construction. Said cartridges are hence furthermore completely housed and protected by said housing to prevent tampering or accidental unloosening of said cartridges, and the current carrying portions are well insulated to prevent short circuits within the plug.

It will thus be seen that there is provided a device in which the several objects' of this invention are achieved, and which is well adapted to meet the conditions of practical use.

As various )ossihle embodiments might be made of the almve invention, andas various changes might be made in the embodiment set forth, it is to be understood that all matter herein set forth or shown in the accoming parts for said fitting mounted on sald member, whereby all of the current carrying parts muy be removed as a unit from said iousmg.

2. A plug comprising a tubular housingr haring a rear wall formed with an opening, an insulating member removably secured within said housing, a pair of terminal members fixed to the rear of said member, a pair of plug blades fixed to the front of said member, fuses interconnecting said blades with said terminal members and a conductor extending into said housing thru said opening and secured to said termina-l members.

3. An electric fittin comprising a tubular housing, a substantial? member removably secured Within said housing and diametrically disposed therein, and a fuse cartridge removably mounted on each side of said member.

4. An electric fitting comprising a tubular housing, an insulating member removably secured within said housing and diametrically disposed therein, and a fuse cartridge removably mounted on each side of said member, said cartridges being dis osed transversely with respect to the longitudinal axis of said housing.

5. An electric fitting comprisin a tubular insulating housing having an en wall and being formedwith an internal screw threaded portion, a substantial] prismatie block made of insulating materia adapted to cooperate with said portion for removably securing said block within said housing, said block forming a longitudinal, diametric partition across said housing and current carrying arts for said fitting mounted on said memer.

6. An electric fittingcomprising a tubular insulating housing having an internal screw threaded portion, a member made of insulating material adapted to cooperate with said portion for removably securing said member within said housing, said member forming a longitudinal partition within said housy prismatic insulating ing, and current carrying parts for said litting mounted on said member, said parts including a cartridge fuse disposed within said housing transversely of the longitudinal axis of said housing.

7 An electric fitting comprising a tubular insulating housing having an internal screw threaded portion, a member made of insulating mate-rial adapted to cooperate with said portion for removably securing said member within said housing, said member forming a longitudinal partition within said housing and current carrying parts for said tting mounted on said member, said parts including a cartridge fuse disposed within said housing transversely of the longitudinal axis of said housing, and removably mounted on said member.

8. An electric `fitting comprising a tubular insulating housing, a substantially prismatic insulating block removably secured within said housing and forming a longitudinal diametric wall across the interior of said housing, a contact member ixed to said block adjacent one end thereof and extending forwardly, a terminal member secured to said block at the opposite end thereof and extending rearwardly, a fuse cartridge, and spring friction means connected to said contact member and terminal for removably mounting said fuse on said insulating block.

9. An electric fitting comprising a tubular insulating housing having an internally screw threaded portion, a substantially flat insulating member having partial threads at the ends thereof adapted to co-operate with said internally screw threaded portion whereby said member forms a diametric partition across the interior of said housing, a pair of plug blades attached to the front of said insulating member adjacent the ends thereof and extending upwardly therefrom, a pair of terminal members secured to the rear of said insulating member adjacent the .ends thereof and extending rearwardly therefrom, and a pair of fuse members disposed on opposite sides of said partition member, each interconnecting a blade adjacent one end of said insulating member with a terminal member adjacent the opposite end of said insulating member.

10. An electric fitting comprising a tubular insulating housing having an internally screw threaded ortion, a substantially flat insulating mem )er having partial threads at the end thereof adapted to co-operatewith said internally screw threaded portion whereby said member forms a diametric partition across the interior of said housing, a pair of plug blades attached to the front of said insulating member adjacent the ends thereof and extending forwardly therefrom, a pair of terminal members secured to the rear of said insulating member adjacent the ends thereof and extending rearwardly there-

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