Патент USA US2105006код для вставки
Jan. 11, 1938. 2,105,006 J. PICKARD BURGLAR ALARM SWITCH Filed Ffèb. l2, 193.5 2 Sheets-S1166?. l ln ",`irl¢n.U ___-___- 2%--;..-5 ` kInventor ._Ãsóß/v Pfc/Balu’ v By pá,” Attorney Jan. 11, 1938. 2,105,006 J. PxcKARD BURGLAR ALARM SWITCH 2 Sheets-Sheet 2 Filed Feb. 12, 1935 3, 7 ,.I lJ,r. Inventor Attomey r Patented Jan. 11, 1938 2,105,006 UNITED STATES PATENT OFFICE 2,105,006 BURGLAR ALARM SWITCH Joseph Pickard, Chicago, Ill. Application February 12, 1935, Serial No. 6,203 1 Claim. (Cl. 200-54) The present invention appertains to new and One end portion of the clamp arm 29 is formed useful improvements in switches especially adapt to provide a jaw 32 engageable with a door knob ed for use in burglar alarm apparatus. shank (not shown) and which coacts with a piv The principal object of the invention is to oted jaw 33 for securing said arm 29 in position. 5 provide a burglar alarm switch which is especial A screw 34 is mounted in the arm 29 and extends ly adapted for use in hotels and other public slidably through the pivoted jaw 33 and has dwelling places. threaded thereon a wing nut 35 for closing said Another important object of the invention is pivoted jaw against the tension of a coil spring 36 to provide a switch structure which can be con 10 veniently installed for use in conjunction with burglar alarms without requiring alteration of the building construction. Other objects of the invention are to provide a burglar alarm switch which will be comparatively 15 simple in. construction, strong, durable, eilicient and reliable in use, compact, portable and which may be manufactured at low cost. All of the foregoing and still further objects and advantages of the invention will become ap 20 parent from a study of the following specification, taken in connection with the accompanying draw ings wherein like characters of reference designate corresponding parts throughout the several views, 25 and wherein: Figure 1 is a view in front elevation of the door switch. Figure 2 is a top plan View of the door switch. Figure 3 is a view in rear elevation of the door switch. Figure 4 is a vertical sectional view, taken sub 30 stantially on the line 4--4 of Figure 1. Figure 5 is a View in front elevation of the operating means for the door switch. Figure 6 is a detail View in perspective of the 35 rod constituting a part of the door switch operat ing means. Referring particularly to Figures 1 to 4, inclu« sive, of the drawings, it will be seen that the door unit I ‘I includes a clamp which is designated gen 40 erally by the reference numeral I8 which is adapted to be removably mounted on the door frame I9. The clamp I8 includes a pair of op posed, co-acting jaws 20 which are slidably con~ nected with each other and which are adapted to 45 embrace the door frame I9 therebetween. As best seen in Figure 3 of the drawings, the longi tudinal portion of one of the jaws 20 is provided with inturned flanges 2I providing channels in which the other of said jaws is slidable. An 50 elongated screw 22 is mounted in the opposed por tions of the jaws 20 and provided with a wing nut 23 for clamping said jaws on the door framíe I9. Mounted on the clamp I8 is a switch 24 which includes contacts 25 with which a pivoted blade 55 26 is engageable, said blade 26 being provided with a projection or handle 2'I on its free end portion. which. is mounted on said screw 34. Rising from the upper end of the arm 29 is a reduced threaded 10 shank 31 having mounted thereon a pair of wash ers 38 between which a rod 39 is adjustably se cured by a wing nut 40 on said shank 31. The rod 39 is preferably formed from a single length of suitable wire and said rod has formed on one end thereof a vertically elongated loop 4I in which the handle or projection 21 of the switch 24 is engaged. At its other end, the rod 39 termie nates in a substantially U-shaped portion 42 (see Figure 6) which straddles the shank 31 and which is clamped between the washers 38. It may be well to here state that the switch 24 is secured on one of the jaws 20 of the clamp I8 by a bolt 43, the other jaw 20 having formed therein a slot 44 which accommodates said bolt and the secur 25 ing nut thereon, as shown to advantage in Figure 3 of the drawings. It _is believed that the many advantages of a burglar alarm constructed in accordance with the present invention will be readily understood, and 30 although a preferred embodiment of the inven tion is as illustrated and described, it is to be understood that changes in the details of con struction and in the combination and arrange ment of parts may be resorted to which will fall within the scope of the invention as claimed. What is claimed is: A switch operator comprising a switch operat ing arm having an outstanding pintle, a door knob attaching clamp, said clamp consisting of an elongated member having a curved end por tion, a leg pivotally secured at one end to the intermediate portion of the elongated member and having its opposite end portion curved and opposed to the curved end of the elongated mem 45 ber, a bolt and nut connecting the leg with the elongated member, a coiled compressible spring on the bolt having its ends impinging against the said elongated member and the leg, the upper end of the elongated member being provided with a threaded extension, a nut on the threaded exten sion, a connecting rod having a slotted end receiv ing the pintle on the switch arm, the other end of the rod being secured to the door knob clamp by the clamping action of the nut on the threaded extension. JOSEPH PICKARD.