US 1275693 A
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Description (OCR text may contain errors)
CONVERTIBLE CAP FOR ATTACHMENT PLUGS. APPLICATION ElLED 020.11. lim.
Patented Aug. 13, m8.
INVENTOR 1 I ATTORNEY .HARVEY HUBBELL, OF BBIDGEPORT, CONNECTICUT.
CONVERTIBLE CAP ATTACHMENT-PLUGS.
Specification orletters Patent.
Patented Aug. 13, 1918.
Application filed DecemBer 1'7, 1917. Serial No. 207,419.
To all whom it may concern:
Be it known that I, HARVEY HUBBELL, a
citizen of the United States, residing at Bridgeport, county of Fair-field, State of Connecticut, have invented an Improvement in Convertible Caps for Attachment-Plugs,
of which the following is a specification.
This invention has for its object to provide-a cap for attachment plugs (and receptacles as well) which shall be so constructed that one or both of. the contact blades may be readily removed and shifted from one position to another, so as to adapt the cap or use in connection with attachment plugs having, alined blade receiving slots, or polarizin lade receiving slots, and where both of t e contact blades are made shiftable the cap is adapted for use in connection with.attachment plugs having either alined, or polarizing, or parallel blade receiving slots, the cap being readily convertible from one tyge of'cap to another.
ith these and other ,objects in view, I.
have devised the novel attachment plugcap which I will now. ,describe, the operative 7 parts consistin of six members only, two
of which'are upli'cates, and all of which are simple and inexpensive to produce.
v In the accompanying drawing forming a part of this specification,
Fi re 1 is a plan view of my novel converti 1e plug cap,
Fig. 2 a slde elevation thereof,
Fig. 3 a section on the line 3-3 in Fig. 2, looking in the direction of the arrows,
Figs. 4, 5, 6, 7 and 8 are perspective views, showmg the several members disassembled,
Fig. 9 is a section of the blade carrying block on the line 9'-9 in Fig.7, looking in the direction of .the arrows,
Fig. 10 an inverted plan view of the blade carrying block,
F1 11, 12 and 13 side elevations of my novef convertible'plug capshowin respectivel the.contact blades in the a ined,.the para lel and the polarizing positions, and Fig; 14 is a plan view o a blade carrying block which provides for two chan es only,
. that is from the 'alined'to the polarizing arran ement of one blade or vice versa.
2% denotes the blade carrying block, 21 the covering block, both of ich are made of insulating material, 22 the shiftable contact blades and 23 and 24 the shell members which are provided with inter-engaging rolled threads.
The blade carrying block is a moderately thick disk of insulating material which in the preferred form is provided with two diametrically placed combination or T-slots 26, contiguous to each T-slot with recesses 27 and 28,.and in its edge with recesses 25.
The contact blades are detachable from the block and are provided with suitable heads 29, each carrying a binding screw 30, and with retaining lugs 31 adapted to engege: recesses 27 or 28 m the blade carrying 00 The covering block, made of insulating material, is provided with a central hole 32 through which the electrical conductors, not
shown, pass, and with a recess 33-.
Shell member 23 is shaped to correspond with and inclose the covering block, and shell member 24 is shaped to correspond with and inclose the blade carrying block and is furthermore provided with lugs 34, which are adapted to be received in recesses 25 in the edge of the blade carrying block.
Each shell member is provided with a screw thread adapted to engage the other.
In assembling, the contact blades are passed through the T-slots and the lugs 31 on the heads thereof are placed in en agement either with recesses 27 or 28, as Wlll be more fully explained. The blade carrying block, with the contact blades in place, 1s
then seated'in shell member 24 as clearly I gagement cause the covering block to bear upon the heads of the contact blades and back up said blades so that they will not yield when pushed through the slots of anattachment plug and into. engagement with the plug contacts, not shown, and the engagement of the lugs on shell member 24: with the recesses in the edge of the blade carrying block, prevent any movement of said block, relatively to the shell members.
The heads of the combination or T-slots are toward each other.- For convenience in description, I will refer to the head portions of the T-slots as the transverse arms of said slots, and the portions of said slots ,atri ht angles to the transverse portions, as
the iametrical arms of said slots. In the alined arrangement of the contact blades, said blades lie inthe diametrical portions of the T-slots and the lugs 31 on the heads of the blades are in engagement with recesses-27 in the blade carrying block. In the parallel arrangement of the contact blades, the blades lie in the transverse arms of the T-slot and the lugs 31 are in engagement with recesses 28 in the blade carrying block. This engagement of the lugs on the heads of the contact blades with the recesses in the blade carrying blbck acts to hold the contact blades securely in place, renders any twisting of the blades practically impossible and insures correct alinement of the blades at all times. In the polarizing arrangement of the contact blades, one blade lies in the diametrical portion of the corresponding T-slot with its lug 31 in engagement with a recess 27 in the blade carrying block and the other contact blade lies in the transverse portion of the corresponding T-slot with its lug 31 in a recess 28 in the blade carrying block. In assembling, it i just as easy to set the contact blades for one type of cap as for another. To convert the cap from one type to another, the shell members are separated, the covering block removed and one or both of the contact blades are removed, given a quarter turn, as may be required, to produce the required type of cap, and inserted in the T-slot again. Detachment of the electrical conductors from the binding screws is wholly unnecessary, and to change from one type of capto another when the cap is in use, requires less time than it takes to describe the operation. Supposing the contact blades are in the alined position, to change to the parallel position, both blades would be removed from the diametrical arms of the T-slots and inserted in the transverse arms. To change from parallel to alined, the contact blades would be removed from .the transverse arms of the T-slots and inserted in the diametrical arms. To change from either the alined or the parallel arrange ment, to the polarizing arrangement, one contact blade only has to be changed. If in the alined position, it would be changed to the transverse position, and vice versa.
:sitThe form 'illustrated in Fig. 14 difiers on1yinthat the parallel arrangement of masses the contact blades is not provided for. One combination or T-slot is provided as before and in lieu of the other T-slot, I provide a diametrically placed I-sl'ot 35, which will receive a contact blade in the alined position only, and in connection with this slot I provide a lug receiving recess 27, lug receiving recess 28 of the other form being dispensed with. In fact so far as this form of the invention is concerned, the alined blade need not be removable at all, but may be permanently secured in place, the object of the invention being attained by making the other blade shiftable from the alined to the polarizing-position, or vice versa.
Having thus described my invention, I claim 1. In a convertible cap for attachment plugs, the combination of an insulating block having slots with diametrical and transverse arms and recesses contiguous thereto, and shiftable contact blades each ada ted to engage either arm of a T-slot an having a lug adapted to engage one of the recesses when seated in either arm of a slot.
2. A convertible cap for attachment plugs comprising a blade carrying block having T-slots, recesses contiguous to the T-slots and recesses in its edge, shiftable contact blades each adapted to engage either arm of a T-slot and provided with a head having a lug adapted to engage one of the contiguous recesses, a covermg block en aging the head of the contact blades a she member adapted to inclose the blade carrying block and having lugs engaging the edge recesses, and another shell member inclosing the covering block and'having threaded en gagement with the first mentioned shell member.
3. In a convertible ca for attachment plugs, the combination 0 shiftable contact blades having heads provided with retaining lugs, a blade carrying block having T-slots placed diametrically with the transverse arms of said slots toward each other, said blade carrying block having contiguous to each T-slot a recess adapted to receive the retaining lug when a contact blade is in the diametrical arm of the T-slot and another recess adapted to receive the retaining lug when the contact blade is in the transverse arm of the T-slot.
4. In a convertible ca for attachment plugs, the combination 0 a blade carrying block having T-slots and recesses contiguous thereto, shiftable contact blades ada ted to engage either arm of the T-slots and aving heads provided with retaining lugs each ada ted to engage a recess when the contact bla e is in either the diametrical or the transverse arm of the T-slot, a covering block adapted to engage the heads of thewith each other.
v 5.. In a convertible cap for nttect logs, the combination of en insnietin t lock'having an eiined contact blade end e the hlocks enot having threeflefl engagement slot with diemetricel and transverse 1 m and recesses contiguous thereto, and e shittremeee 8 able contact blade adapted to engage either arm of said slot and having o. lug aflapted I to engage one of the recesses when seated 10 in either arm of the slot In testimony whereof an my signature.