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Publication numberUS2194521 A
Publication typeGrant
Publication dateMar 26, 1940
Filing dateSep 17, 1938
Priority dateSep 17, 1938
Publication numberUS 2194521 A, US 2194521A, US-A-2194521, US2194521 A, US2194521A
InventorsDavidson Isaac
Original AssigneeDavidson Isaac
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Telephone lock
US 2194521 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

March 26, 1940. ENGELs QN 2,194,521

TELEPHONE LOCK Filed Sept. 17, 1938 INVENTOR 8C1; W

ATTORNEY Patented Mar. 26, 1940 PATENT, OFFICE TELEPHONE LOCK David Engelson, New York, N. Y.; Isaac Davidson executor of David Engelson, deceased Application September 17, 1938, Serial No. 230,376

3 Claims.

The present invention'is directed to locking devices for rotary dials associated with the base of. a telephone instrument and is especially concerned with looking and closure means to preclude unauthorized use of the telephone for outgoing calls without however interfering with normal operation of the telephone for reception of incoming calls. The invention has as one object the provisionpf a split closure comprising pivotally connected and-overlapping sections for covering the dial of the'telephone and including means cooperating with-the fixed finger stop associated with the rotary dial to prevent rotation of the closure. The invention has as a further acter referred to wherein the complementary sections each include a curved lip cooperating to interlock the rim of the rotary dial to preclude removal of the closure while in its closed position on the dial. The invention has a further object to provide a relatively lightweight but durable and improved closure having pivotally connected sections or components to permit lateral separation thereof in respect to the dial and to allow 5 convenient closing of the sections over the dial and including means adapted to register in the closed relation of the sections to receive detachable locking means to prevent pivotal separation of the sections. Other objects, advantages, and features of the invention will be more apparent from a consideration of the following detailed description'considered in connection with the accompanying drawing in which:

Fig. l is a perspective View of my closure lock- 35 ing device shown partly broken away.

Fig. 2 is aplan view of Fig. 1. Fig; 3 is a sectional view taken along the line 3-3 of Fig; 2. i

Fig. 4 is a sectional View on the line 4-4 of 40 i Fig. 5 is a fragmentary elevational view of the lower section looking in the direction of the arrows on the line 5-5 of Fig. 1.v

Fig. 6 is 'a bottom view of Fig. 5 and showing'a portion of the fixedfinger piece locked in a recess of the lower closure section.

Fig. 7 is a fragmentary view of the split closure, particularly illustrating the stop means to permit the front eyes of the complementary sections of the closure to automatically register.

According to the invention a locking closure generally denoted I is positioned over a rotary dial ll of a telephone instrument l2. This closure comprises substantially semi-circular upper and lower components or sections I3 and I4 havobject the provision of a split closure of the char- The upper and lower sections each include at its rear portion an eye I! through which a fulcrum pin l8 passes. By this arrangement the upper and lower sections are hingedly associated and it follows the complementary closure sections I 3 and 4 can be readily spread apart as indicated by the dash and dot lines in Fig. 2 and if spread apart they may be readily brought towards one another to assume their closed positions as 11- lustrated by the full lines in Fig. 2. v

Each of the closure sections it and M is provided with a circumferentially arranged depending curved lip 49 defining a groove for receiving the rotary rim of the finger actuated dial ii. If therefore the'complementary sections are over the dial and closed, the depending lips l9 embrace the rim of thedial and lock the closure [0 against upward displacement. I

The upper and lower sections 13 and i 4 are provided with a central boss 20 and 2! respectively andthese in part embody the adjacent overlapped portions or inner margins i and I6 of the sections l3 and M. The bosses and 2| in the closed position of the sections in fact constitute a central raised hollow housing for receiving and enclosing the conventional indicia carrying member 22 secured to the rotary dial. Extending outwardly from boss 2| of the lower section I4 but struck out from the latter is the arcuate boss 23 constituting a socket for closely but disengageably housing the arcuate and fixed finger piece stop '24 mounted on the base of the telephone. Arcuate boss 23 has its sides'25 closely but removably straddling sides 26 of the fixed stop 24 to prevent rotation of the closure relative to the dial and to supplement such action, vertical end portion 21 of the fixed stop 24 fits closely but removably into locking recess 28 of the channel or socket 28 formed in part in the arcuate lip IQ of the lower pivoted cover section l4.

With the closure mounted on the dial and closed as shown in Fig. 2 or 3, the front perforated ears 29 of the cover sections I3 and M are disposed in registration, that is to say, if these complementary cover sections are fully closed the perforations of ears 29 automatically line up. This is accomplished when the lower car 29 of the lower section It strikes biased terminal 30 of the depending curved lip l9 of the upper cover section l3. Thereafter the hasp 3| of a key controlled padlock 32 is inserted through the hasp sustaining ears 29 and looked as is Well understood. It follows that the complementary cover sections are locked against pivotal separation and against removal from the dial. In such relation the closure i0 is also prevented from rotation relative to the rotary dial. Thus incoming telephone calls may be received although the dial cannot be manipulated for unauthorized outgoing calls.

To detach the closure from the dial, padlock 32 is first unlocked, hasp Si is removed from the perforations of the superimposed ears 29, the upper section is swung or hinged laterally relative to the dial, and the lower section is lifted from the dial. access can now be had to the dial to permit an thorized use thereof for outgoing calls.

In the broader aspects of the invention, I do not desire to be understood as limiting the embodiment thereof to details herein shown illustratively as a Wide variety of modifications may be made within the scope of the invention.

I claim:

1. In a locking device for a rotary telephone dial associated with a fixed stop and having a raised indicia carrying member, the combination of, a closure for the upper surface of said dial comprising complementary cover sections having centrally arranged raised and overlapping portions for closing said member and each having a depending curved lip for removably interlocking with the rim of said dial, one of said sections having means cooperating with said stop to prevent rotation of said closure relative to said stop,

Thus the closure is removed and dial associated with a fixed stop and having an indicia carrying member, the combination of, a closure for the upper surface of said dial comprising complementary cover sections having centrally arranged and overlapping and substantially diametrically disposed inner portions for encompassing said member and each having a dependi ing curved lip for removably interlocking with the rim of said dial, one of said sections having a hollow boss including sides straddlingsaid stop to prevent rotation of said closure relative to said stop, means hingedly connecting corresponding portions of said sections to permit pivotal separation or closingof said sections, lock sustaining means carried by said sections, and. disconnect able locking means removably associated with sections to prevent pivotal separation thereof.

3. In a locking device for a rotary telephone dial associated with a fixed stop and including a central raised part, the combination of, a substansaid sustaining means and cooperating with said tially disc shaped closure 'for the upper surface of said dial comprising complementary substantially semi-circular, sections each having a depending circular lip for interlocking with. the

rim of said dial and including centrallyarranged of said sections having a hollow struck out housing for receiving said stop, one of said lipshaving a recess including Walls forming a part of said housing and closely straddling the lower part of the sides of said step, said sections having eyes, means to automatically aline said eyes upon pivotal closing of said cover sections, and disconnectable locking means sustained by saideyes to prevent pivotal separation of said sections. w v


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2841658 *Feb 24, 1954Jul 1, 1958Dawkins ThomasLocking device for dial telephones
US3245240 *May 8, 1964Apr 12, 1966James And William De ForrestKnob protector
US4396810 *Jun 15, 1981Aug 2, 1983Cover Hunter HPushbutton telephone dial locks
WO1987004031A1 *Dec 15, 1986Jul 2, 1987King James BertramA telephone guard
U.S. Classification379/445, 70/DIG.580, 70/207, 70/209, 70/2, 70/442
International ClassificationH04M1/667
Cooperative ClassificationY10S70/58, H04M1/667
European ClassificationH04M1/667