US2561076A - Electric door lock - Google Patents

Description

July 17, 1951 M. J. TAsslN I 2,561,076

ELECTRIC DooR LOCK Filed Dec. 31. 1948 2 Sheets-Sheet l Pgs qe Pam "QM/jf www@ A,

'R oARD Invmzar A Hurmy July 17, 1951 M. J. TAslN 2,561,076

ELECTRIC DOOR LOCK Filed Deo. 31, 1948 2 Sheets-Sheet 2 O ivf c l 178 l l R4 R3 R1 if" LINE z LINE '1 Inventor m40/Pme u. TASS/N A Ilm-Ney combination of the keeper.

cuit, in addition, applies potential to the nexta Patented July 17, 1951 UNITED STATES PATENT OFFICE ELECTRIC DOOR LOCK l Maurice J. Tassin, New Orleans, La. Application December 31, 1948, Serial N0. 68,710

2 Claims. 1

This invention relates generally to door locks f The present inventionV contemplates a combination type door lock of the aforedescribed char- 10 acter which is convenient and simple to operate when the correct combination is applied and which is as effective to maintain the door in a vlocked condition asl the conventional key type lock while eliminating the need for a key or keys `and thereby obviating the inherent difficulties in Y'theuse thereof due to the human element or 'factor involved inthe usual handling, hiding, `losing or distribution of individual keys among members of a family.

According to the arrangement of the present invention, an electric vdoor opener is operated under control of a plurality of relays individual to numbered buttons, the electrical connections between the relays and buttons being such as to render each successive relay effective to be operatedas the button individual thereto is depressed in the proper sequential order according to the When the last relay isoperated bythe button corresponding to the last `number in the combination, the electric doorv lock is operated-under control thereof, thereby to allow the door to` bei opened.

As each of the relays is operated, a lock-in circuit therefor is established thereby, and this cirsucceeding button to be depressed according `to `the combination. Other ones of the aforementioned plurality of numbered buttons which do not form a part of the combination vare soconstructed as to be normally `closed and are ar-m,

ranged in the aforesaid lock-in circuits of the relays whereby the relays are de-energzed when any one of the normally closed buttons are opened as thek buttons ,are depressed. In `such case, depressing of the proper buttons must .beingE begun again and continued in the combination proceeds.

An object ofithe present invention is to provide anfelect'ric door lock having all the advantages of a key type lock' while obviating the disadvantages thereof which flow from the need for use of a key.

Y' Another object is to provide an electric door lock which may be operated to allow the opening ofa door from theoutside of a building by pressing a series of numbered buttons in predetermined sequential order according to the combination of the keepers A further object is to provide an electric door vlock. of thischaracten wherein provision is made for restoring kthesame to an initial unoperated condition Whena numbered `button not forming apart of the combination isdepressed.

An additional object of the invention is to pro- -vide a door lock of the.aforedescribed' character which may be setnor arranged to operate on any Ione of a pluralityof different combinations and which .readily maybe adapted and applied to all types of doorsregardless of the shape or'construction thereof or that of the building struc- 'turally associated therewith.

rStill other features, advantages and objects of .the present invention not expressly set forth .hereinbefore are those inherent in or implied from the novel combination and arrangement of parts as will become more clearly apparent from the following descriptionof the preferred embodiment of the invention disclosedqin the ac-l companying drawings wherein:

Figure-.l is a view in elevation illustrating a fragmentary portion of a building having the buttonand relay boxes of the present invention mounted thereon; ,i

Figure 2 is a Asectional view taken along the line 2?-2 of Figurel.;

Figure 3 is a front elevational View of the buttonbox with the cover plate removed and with the ydepresjsor buttons shown in section,

substantially as seen along the line 3*-3 of Figure 4; v Y

Figure l is a sectional view of the button box u as `seen along 4fthe line 4`-.4 of Figure 3, the cover plate also being shown; Y

, Figure 5 is a fragmentary sectional View of the boxgas seen along the line- 5-5 of Figure 4;

`Figure 6 is a sectional view of the relay box substantially as. seen along the line 6`-6 of Figure 1, and y Figure '7 is a diagrammatic view of the complete electrical system of the present invention fcomplete.understandingy of the invention and more particularly to Figure 1 thereof, there is shown thereon a fragmentary portion of a building I upon whose exterior surface there is mounted as by screws II, or the like, a cover plate I2, which may be made of brass or other weather resisting material suitable for the purpose.

Platey I2 covers an opening in the building wall within which `is inserted a metal box I3 whose open end is also closed by the cover plate. Box I3 preferably is provided with an apertured flange I4 at the open end thereof whereby the box may be secured to the wall as by the countersunk head screws I5, or the like.

Within box I3 and maintained in fixed spaced relation with respect to the bottom thereof as by the side strips I6, there is mounted an insulating plate I1 composed of a suitable insulating material such, for example, as Bakelite or fibre board.

Upon plate I6, on the inner side thereof, and in .l

any conventional manner, there are mounted two horizontally disposed rows of button switches lhaving five switches to the row. These switches are identified by the legends PBI through PBS and may be of identical construction except for the initially open or closed condition of their single pole, single throw switch contacts. Each `switch has a depressible button I8, which upon being depressed, opens or closes its associated switch contacts, as the case may be.

The actuating buttons I8 pass through suitable openings therefor in cover plate I2 which has "engraved or otherwise formed therein the nu merals associated with switches PBI to PBS in-l elusive, and respectively numbered one to ten,

i. e., I to 0, inclusive.

The leads or conductors IS from the button switches pass out of switch box I3 as at 20 and 2I to form a supply cable 22 and an intermediate cable 23 which passes within wall I0 and into the metal relay box 24 through opening 25 therein to connect with relays mounted within the box. Box 24 preferably is mounted within an opening formed on the interior surface of the wall and `secured thereto by countersunk head screws 26, box 24 also preferably having an apertured mounting flange or lip 21 for receiving screws 26. The open end of box 24 is closed by a suitable cover plate 28 secured to wall IIJ as by screws 29,

` or the like.

Leads or conductors 3|] from cable 23 pass within relay box 24 to a plurality of relays designated relay l, relay 2, relay 3 and relay 4, these relays being of a conventional type and mounted in any conventional manner on an insulation plate 3I, which may be formed of any insulation material suitable for the purpose such, for example, as Bakelite or fibre board.

Plate 3| is maintained in fixed spaced relation with respect to the bottom of box 24 by means the secondary winding to Figure 7, of trans-v former 36 and the actuating winding 31 of the electric door lock generally designated 38.

Referring now to Figure 7 for a more complete understanding of the manner of operation of the electric combination doorkeeper of the present invention, let it be assumed that rthe door 4 3S is locked, as illustrated, the bolt 4I) being urged into a keeper 4| in the door as by the spring 42.

For the purposes of illustration, the button switches and relays have been wired to open the electric door lock 38 on the combination -6-3-2. It will be understood, however, that the wiring may be arranged to provide numerous other different combinations. Moreover, to provide the .combination S0, push button switches S and 0 are connected in series, thereby requiring only four relays. When five single numbers are employed, i. e., in a combination S-ll--6-3-2, ve relays are required. The operating principle in either case is the same, however.

To set up the aforesaid combination of 90-6-3-2, the switch contacts of button switches PB2, 3, 6, S and Il are normally open and are connected in series with line I, whereas the contacts of switches PBI, 4, 5, 1 and 8 are normally closed and are connected in series with line 2, lines I and 2, being supplied, for example, from secondary winding 43 of transformer 36, whose primary winding 44 may be supplied from a conventional v., A. C. source. It will be understood that D. C. voltages may be employed when desired and any suitable magnitudes of either D. C. or A iC. voltages may be employed, commensurate with the operating voltages of the relays.

Now to operate the door lock, buttons S and 0. are first momentarily depressed concurrently, thereby to complete a circuit to relay I, from line I, by way of switch contacts PBS and PBS. conductors ISA and 30A, to the operating coil of relay I, conductor 30B, conductor ISB, and thence through switch contacts PBS, PB1, PBS, PB4 and PBI to line 2. As relay I operates, its normally open contacts 45 close to connect conductor ISA to conductor ISCwhich is an extension of line I, thereby to establish a lock-in circuit for maintaining operation of relay I from lines I and 2, after switches PBS and PBI) open upon release of actuating buttons S and 0 and to apply potential at line I to switch PBS.

Thus, when button 6 is depressed to close switch PBS, line I potential is applied by way of conductors ISD and 30C to relay 2. Since the other side of relay 2 is connected by way of conductors 30D and ISB to line 2, through normally, closed switches PBS, 1, 5, 4, and I, relay 2 operates to close its normally open contacts 46.

As contacts 46 close, conductor ISD is connected to conductor ISC and line I thereby to establish a lock-in circuit for maintaining the energization of relay 2, after switch PBS is opened upon release of button 6 and to apply potential at line I to switch PB3. Thus, when button 3 is depressed to close switch PB3, line I potential is applied by way of conductors ISE and 30E to relay 3. Since the other side of relay 3 is connected by way of conductor 3UF and ISB to line 2, through normally closed switches PBS, 1, 5, 4 and I, relay 3 operates to close its normally open contacts 41.

As contacts 41 close, conductor ISE is connected to conductor ISC and hence to line I, whereby a lock-in circuit is established to maintain the energization of relay 3, after switch PB3 is opened upon release of button 3. Contacts 41 also apply line I potential to switch PBZ by way of conductor ISE whereby, when button 2 is depressed to close switch PB2, line I potential is applied by way of conductors ISF and 30G to relay 4. Since the other side of relay 4 is connected by way of conductors 30H and IBB to line 2 through normally closed switches PBB, l, 5, it and l, relay 4 operates to close its two pairs of normally open contacts 48 and 49.

As contacts 48 close, conductor ISF is connected to conductor ISC and hence to line l, whereby a lock-in circuit is established to main tain the energization of relay 4, after switch PB? is opened upon release of button 2. As contactsI 49 close, an obvious circuit is completed from transformer secondary to the actuating coil 3l of electric mortise 38 whereby bolt 40 is withdrawn from mortise 4I and the door is opened.

It will be noted from the foregoing that the lock-in circuits for the relays in each case are completed through the normally closed switches PBS, 1, 5, 4 and I. Thus, upon depressing any one of the buttons corresponding to these switches, after the combination has been started or completed the relays which have been operated are released and the keeper is restored to its initial unoperated condition, and the comW bination must be started again if the door is to be unlocked.

It should be noted further that a simultaneous closing of switches PB2, 3, 6, 0 and il, will also allow opening of the door. However, such operation is inconvenient and cannot readily be accomplished without also actuating one of the normally closed switches, the actuation of any of which latter switches would prevent operation of the relays through their initiating or starting as well as through their lock-in circuits.

From the foregoing it should now be apparent that I have provided an electric combination doorkeeper, which is well adapted to fulfill the aforestated objects of the invention. Moreover, whereas the invention has been disclosed in particularity with reference to a preferred emhodi ment which gives satisfactory results, it will be understood by those skilled in the art to which the invention most nearly appertains, that additional embodiments and modifications thereof may be provided without departing from the spirit and scope of the invention as defined by the appended claims.

Having described the invention, what is claimed as new is:

1. An electric door loclr of the character disclosed comprising an end circuit, a plurality of i relays, circuit means including a plurality of normally open push button switches numbered in acn cordance with the numbers of a preselected comu bination and arranged to operate said relays in predetermined sequential order as said switches i" are closed in sequence according to the number sequence of the combination, circuit means controlled by the last of said relays to be operated for closing said end circuit as said last of the relays operates, a plurality of lock-in circuits in dividual to said relays and adapted to be rendered effective as the relays operate to maintain the energization of the relays after the switches individual thereto have been opened, said loch-in circuits individual to all but said last of the relays being effective to render the next succeeding switch in the combination effective to operate the relay individual there-to as the switch is closed, and a plurality of normally closed and numbered push button switches included in series circuit in said lock-in circuits whereby the lock-in circuits are interrupted thereby to restore the keeper to an initial unoperated condition when any one of said normally closed switches is opened after the combination is applied to the keeper.

2. An electric door lock including an end circuit, a plurality of normally open push button switches numbered in accordance with the numbers of apreselected combination and connected in series in the order corresponding to the nurnber sequence of thecombination, a plurality of normally closed and numbered push-button switches arranged in series connection with respect to each other, rst, second, and third relays each having a pair of normally open contacts adapted to be closed as the relay operates, a fourth relay having two pairs of normally open contacts adapted to be closed as the relay operu ates, a first circuit including said first relay, said series connected normally closed switches, and the series connected switches corresponding to the first and second numbers of the combination for energizing the first relay as the last named switches are closed concurrently, a second circuit including second relay, the contacts of the first relay, said series connected normally closed switches, and the switch corresponding to the third number of the combination for maintaining the energization of the first relay upon closn ing of the contacts thereof as the first relay operates and for energizing the second relay when said last named switch is closed, a third circuit including said third circuit including said third relay, the contacts of the second relay, said series connected normally closed switches, and the switch corresponding to the fourth number of the combination for maintaining the energization of the second relay upon closing of the contacts thereof as the second relay operates and for energizing the third relay when said last named switch is closed, a fourth circuit including said fourth relay, the contacts of the third relay, said series connected normally to closed switches, and the switch corresponding to the fth number of the combination for maintaining the energization of the third relay upon closing of the contacts thereof as the third relay operates and for energizing said fourth relay as said last named switch is closed, a fifth circuit including one pair of the contacts of the fourth relay and said series connected normally closed switches for maintaining the energization of the fourth relay upon closing of the contacts thereof as the fourth relay operates, and a sixth circuit including the other pair of contacts of the fourth relay and said end circuit as the fourth relay operates.

MAURICE J. TASSIN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,793,440 Harders Feb. 17, 1931 1,905,965 Leschke et al. Apr. 25, 1933 1,938,150 Marateck Dec. 5, 1933

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