US1812293A - Protective grating - Google Patents

Description

s. B. HEs's f N Q e /f R P HM 1 `l 6 u 4 s 9 1 a Q 1 oww 4 I 1 1 2 2 1 June 30, 1931.

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Patented June 30, 1931 UNITED STATES PATENT OFFICE SIMON' 1B. HESS, OF NEW YORK, N. Y.

PROTECTIVE GRATING f Application filed April 12, 1923. Serial No. 631,738.

` This invention relates generally to burglar A grating formed of wood for the sake of alarm ysystems of the electrical protective cir lightness in weight and ease in handling is cuit type and particularly relates to the improvided to be mounted in place across each proved means for holding circuit-completing door and window opening when the building gratings in operative position during the is left unoccupied, as during the night-time 55 hours when the building is unoccupied. hours. The grating includes vertical side The invention consists in the provision of frame members 14 and intermediate vertical improved means for establishing electrical bars 15 crossed by the transverse bars 16 to contact between contact members carried bv form a grating or grid.

a protective grating and corresponding con- The inner faces of the side frame members 50 tact members mounted on a door or window 14 of the grating are provided with contact casing and forming terminals for anormally plates 17 and 18 so positioned as to engage closed circuit protective system. The inventhe Contact plungers 9 and 10 on the window y. tion yalso includes means for readily placing frame when the grating is in position thereon.

the grating in or removing it from operative The Contact plates 17 and 18 form terminals 65 position and for holding it securely in place for conductors 19 embedded in the bars 15 when in protecting position. and 16 yand strung back and forth and up and In the drawings, in which a preferred down with the bars of the grating to provide form ofthe invention has been selected for a partial circuit terminating at they opposite 20 illustration, sides of the grating in the contact plates car- 70 Figure 1 is an isometric view of a portion ried by the side frame pieces 14. It will be of a protective grating andy showing means seen that this arrangement of the conductors embodying the invention for holding the carried by the grating insures the rupture of grating in place. the circuit and brings about the actuation of Figure 2 is 'a view in vertical section of a alarm or other indicating mechanism in the 75 portion of the device in Figure 1 showing event that one of the grating bars is broken circuit closers and grating holding members by an unauthorized entry through the proembodied in the invention. tected opening.

Figure 3 is a view in horizontal section of In order to hold the protective grating in the device shown in Figure 2. place ,in guarding relationk to the window or 80 v Referring to the ydrawings for a more deother opening, the side frame members 14 of tailed description of the invention, the verthe grating are provided with openings 19 tical frame member of a window casing yis closed at their outer ends by plates 2O havshown at 5. A vertical wood strip 6 is ating openings 21 therein of an inverted key tached tothe face of the frame member 5 in shaped formation. It will be seen that by 85 any suitable manner and carries an outstandpassing the enlarged lower ends of the opening'post 7 having an enlarged head 8. The ings 21 in the plates 2O of the grating over strip 6 is also supplied with contact plungers the enlarged heads 8 of the posts 7 and then 9 and 10 mounted to protrude through openlowering the grating to bring the more re- 40 ings in plates 11 .and 12 and tending to be stricted upper ends of the openings 21 into 90 projectedoutwardly by the action of springs engagement with the posts 7 to the rear of 13 mounted in recesses at the rear of the the heads 8, the gratings are securely locked plates 11'and 12 and bearing against the head in position on the supporting posts 7. The

A of the contact plungers 9 and 10. length of the `posts 7 back of the heads 8 is The plates 11 and 12 and the contact plungsuch that the contact plates 17 and 18 carried 95 ers 9 and y10-together form terminals of a by the grating engage and depress the conpair of conductors included in a protective tact plungers 9 and 10 carried by the strip 6 circuit installation which forms no part of on the window casing or frame against the the present invention and is accordingly not pressure of the springs 13. The result of this illustrated. n kis that the springs 13 hold the contact plung 10 ers 9 and 10 in close contact With the contact plates'l'? and 18 and also hold the frame in close and rigid engagement With the under surfaces of the enlarged heads 8 on the posts 7.

The grating is readily placed in protecting position at the close of the day and as readily removed therefrom when thebuilding is again opened and occupied, theseoperations being greatly facilitated by the referred to construction of the pin and slotl attaching means between the'grating and the frame of the door or Window to be protected. Y

In order to provide a safeguard against the removal of the Wood strips 6 andthe pos'- sibility of thereby avoidinga breaking of the circuit through the grating lor barrier, circuit closers 22 arefset into the yvertical frame members" 6 as indicated inFigure. 2 of the drawings. By this arrangement the spring pressed-contact member 23 of the circuit closer is normally held out of contact With the` contact 24 by engagement with Athe Window frame 5. Should the frame member 6 be pried fromits position the contact member 23 makes contact with the point-24 and closes a short or bridge circuit with relation to the circuit included in the grating circuit. The short circuit thus obtained manifests itselflin any desired manner at the central oiiice, through taking advantage of the dev crease'in'resistancebetween. the bridge circuitand that includingthe great length of conductor carried by the grating;

, What is claimed is Y y 'l'.Y Aburglary preventing device comprising a grating, means for removably attaching said grating' to .a Window frame, interlocking pin and slot members yon the frame and grating for holding thergrating in place, interengageable electrical contacts mounted on said frame and said grating, one of said contacts being spring-pressed forurging said pin and slot members into firm engagement With each other to maintain said gratingin positionon said frame, an electrical'conductor passing through'the grating and connected'vvith thegratingcarried contacts, and a protective ycircuit connected With vthe framecarried contacts. j 2. A burglary'preventing Vdevice comprising a grating adapted ,to be removably attached to a Window frame, interlocking pin and slot members ontheframe and the grat-V ing for holdingthe grating in place, the pins being provided With heads,fapair of contacts carried by the grating, a pair of contacts car'- ried vby thek frame, a ypair of springs holding the frame-carried lcontacts in` engagement vWith the grating-carried Y contacts, said springs serving-also to, maintain the. grating 1n firm engagementwith the heads ofthe pins, anelectrical conductor passing through the grating and connected with the gratingcarried contacts, and a protective circuit eX- tending through grating and connected With the frame-carried contacts.

3. A burglary preventing device comprising a grating means for removably attaching said grating to a Window frame, means for holding the grating in place including a member provided With a key-hole slot and also includinga pin member provided With an enlarged head for engagement with said slot, interengageable electrical contacts `mounted on said frame and said grating, one

of said contacts being spring-pressed for urgingsaid pin and slot members into firm engagement With each other to maintain said grating in position on said frame, anelectrical kconductor passing through the grating and contacts vurging` said grating-carried means into interengaged position with said framecarried means, an electrical .conductorpassing through the grating and connected With-the grating-carried contacts, and a protective circuit connected with tacts. y

5. Ina burglary preventingvdevice, the combination With a grating support secured to a Window frame, of agrating, means for ldetachablysecuring said grating to said-support, Vinterengageable electrical contacts mounted on said support and saidgrating, and electrical conductors passing-through the grating and connectedfwith the vgrating-carried contacts, stationary and movable contacts mounted on said` support, said movable contact being providedvvith means for holding said-movable contact out of engagement with said 'stationary contactwhile the support is in position on the frame and also for permitting said movable Vcontact to engage said stationary contact upon removal of saidsupport froml said frame, and a protective Vcircuit connected With said support-carried contacts and with said stationary and movable Vcontacts. u f f 6. In a burglary preventing Y device, the combination With a grating support secured to a vvindovs7 frame, of a grating, interen'gaging-means'on said grating'andsupport forremovably-holding the Vgrating on thefsupport, -interengagingelectrical contacts mounted on the frame-carried consaid grating and said support, one` of said'` contacts 'being spring-pressed for urgingA said interengaging means into firm engagement gagement with said stationary contact While to maintain said grating in position on said support, an electrical conductor passing through the grating and connected with the grating-carried contacts, stationary and movable contacts mounted on said support, said movable Contact being provided With means for holding Said movable Contact out of enthe support is in position on the frame and also for permitting said movable contact to engage said stationary contact upon removal of said support from said frame, and a protective circuit connected with said supportearried contacts and With said stationary and movable contacts.

In testimony whereof I aiX my signature.

SIMON B. I-IESS.

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