US1103883A

US1103883A - Door contact-switch.

Info

Publication number: US1103883A
Application number: US77155213A
Authority: US
Inventors: Albert Kielblock; Hermann Dittmann
Original assignee: Individual
Current assignee: Individual
Priority date: 1913-06-03
Filing date: 1913-06-03
Publication date: 1914-07-14
Anticipated expiration: 1931-07-14

Description

A. KIELBL'CK & H. DITTMANN. booR CONTACTv SWITCH. APPLIGATION FILED JUNEYS, 1913.

Patented July 14,1914.

rmt Noxious PETERS ca., wAsHmcroN, 1:A c.

ALBERT KIELBLOCK AND HERMANN DITTMANN, OF ARNSTADT, GERMANY.

noon CONTACT-SWITCH.

Specification of Letters Patent.

Application filed June 3, 1913. Serial No. 771,552.

To all whom it may Concern y Be it known that we, ALBEETKIELBL-ocir and HERMANN DITTMANN, subjects of the German Emperor, residing at Arnstadt, Principality of Schwarzburg-Sondershausen, Germany, have invented certain new and useful Improvements in Door Contactv Switches, of which the following is a specification.

This invention proposes an improved door contact switch which is so constructed as to operate, in effect, as a time switch, the arrangement being such that on the door beingvopened, an electric circuit is closed and maintained closed for a certain time after the closing of the door, depending on the adjustment of the switch, until, .after the expiration of that time, the circuit is automatically opened by the switch.

According to this invention, an arm moved by the door and controlling by its motion the contact device, is placed under the action of a spring and of a brake device, so that the forward movement of the arm produced by the opening of the door and bringing the contact device into the position for closing the circuit, takes place in opposition tothe action of the spring which brings about a return movement of the arm, retarded bythebrake device, the circuit remaining closed until the arm has again l reached its initial position.

A construction according to this invention is illustrated `by way of example in the accompanying drawing.

Figure 1 is a front elevation of the device,

. partly in section, Fig 2 a side elevation, Fig.

3 a plan ofthe device in the position of rest, Fig..4 a plan corresponding to Figf, with the switch in the position corresponding to the open door, and Fig. 5 is a detail view.

To an insulated bed-plate 1 is secured an angle part 2 carrying a vertical pivot pin 3. About the'said pin 3 is rotatably mounted a spring casing 4 containing a spring 5 secured on the one hand, to the fixedpin 3, and on the other hand, to the casing 4. rlhe spring casing 4 is closed at the bottom by plate 6 provided with four vertical studs 7,

made of-rubber or other yielding or resilient material. vThe lower faces of the said studs y7 rest against the fiat surface of a glass plate 8, which, in turn, rests upon the horizontall arm of the angle part 2, an intermediate plate 9` being inserted between said arm and the plate 8. Above the spring cas-- Patented July 14, 1914.

ing 4 is arranged a disk 10 which is suitably held against turning, and above this disk are placed a nut 11, engaging with the pivot pin 3, and a lock nut 12. The nut 11 is used for regulating the pressure exercised by the studs 7 on the plate 8 and the consequent y friction between the front faces of the studs 7 and the surface of the plate S, while the lock nut 12 is used in known manner for securing the nut 11. The disk 10 is provided at the upper surface with a scale division p 1021 showing the adjustment. The spring casing 4 is encircled by the boss or hub 13 of the lever 14, which can be secured to the `spring casing 4 by means of asegment part 15 pivoted at 16 to the lever 14, and of a screw 17 arranged on the segment 15. Then securing or locking the lever 14, thatend 15a of the segment which is situated opp osite the screw 17, is pressed against the outer edge of the spring casing 4, while on the other hand the screw 17 also engages with the surface of the spring casing 4. The lever 14 is provided at its front free end with a depending driver 19 carrying a terminal roller 18, the said driver being pivoted to the lever 14 in such a manner that it can be swung to one side, so that it can be turned within or out of reach of the door 20, in the latter case into the dotted-line lposition shown in Fig. 1. The-hub 18 'of the lever 14 Y is further provided with an upward flange 21 which extends about half-wayaroun`d its peripheral edge and is concentric with the pivot pin 3, the said flange 21 being adjustable on the hub 13 by means of the screw 22 and provided at its ends withbeveled portions 21Pand 211). To the-plate 1 is also secured a bolt 25 sli'dablein the guide 23 and provided at its lower end with a roller 26 arranged for coperation withthe flange 21. At its ripper end, the bolt 25 is provided with a Contact piece 26fL secured to the bolt 25 by means of an insulating piece 27, to which. latter is connected the upper end of a spring 24 that serves to normall 1 draw said rod downward. Above the contact piece 26a, are arranged two spring;

contacts

28, 29 which are connected to the electric wires through the agency of the

corresponding bearing posts

30, 31 which in their turn are l the bed plate 1.y

responding time.

that the time during which the circuit re- 18, 19, the lever 14 from the position shown in Fig. 3, into that shown in Fig. 4. At the beginning of this movement, the cam face 21a engages under the roller 26 of the bolt 25 and raises the latter, in opposition to the laction 0f the spring 24, whereby the electric circuit is closed, owing to the engagement of the

contacts

28, 29 by the contact piece 26. As during further movement of the lever 14, the roller 26 travels along the upper edge of the flange 21, the circuit at first remains closed. Whenthe door 2O is again closed, the tensioning of the spring effected during the opening of the door or during the movement forward of the switch lever 14, brings the lever 14 back to its original position. This return movement is however retarded by the braking action of the studs 7 on they plate 8, to a greater or less extent according to the adjustment by means of the nut 11.l Since the circuit is maintained closed, as will bereadily understood, until the lever 14 returns to its initial position and the bolt 25 has again assumed itsl initial position, (after each opening of the door) the lamps in the circuit closed by the above mentioned cont-act device will remain alight for a cori It has been already stated mains closed, can be adjusted at will the adjustment depending on the local conditions. If the door contact switch is, for instance, arranged 0n a street door, itl is necessary to seek that the circuit remains closed for a time required to reach the fiat situated at the top of the building, if for instance the'door contact switch switches in the lamps for lighting the staircase. The door contact switch, chiefly intended therefore for closing a lamp circuit, may also be utilized to close a bell or other circuit. It is however possible in a simple manner to close simultaneously by the door contact switch several circuits independently of each other, for instance a circuit for producing an audible signal and a lighting circuit. To effect this result the bolt 25 is provided with a lateral finger or like projection 32, preferably insulated, which, in the initial position' of the bolt 25, is situated under two -superposed

spring contacts

33, 34 used for closing the bell circuit and also secured to If during an oscillation of the lever 14 in the manner hereinbefore described, the bolt 25 is pushed upward, the projection 32 raises the lower contact 33 `'against the upper contact 34, whereby the electric signal circuit is closed and remains closed until the lever 14, after the closing of thel door 20, has again reached its initial position.

In order to enable the door contact switch to be used for right-handed as well as for left-handed doors, its parts are-'made symmetrical, so that they can be simply turned as required, and of course the spring 5 in the spring casing 4 must also be turned accordingly.

What we claim as our invention and desire to secure by Letters Patent is z- 1. In a switch, the combination, with a vertically-movable switch member; of a rotatable element upon which the switch member rests having a cam arranged to engage and raise said switch member; an operating member connected to said element for rotating the same in one direction; a spring connected to said element for rotating the same iii the other direction; and a brake device -for retarding the second-named rotary movement of said element.

2. In a switch, the combination with an endwise-movable vertical switch member; of a rotatable element arranged beneath the switch member and provided with a earn adapted to engage said switch member and having oppositely-beveled ends and an intermediate straight portion; means for rotating said element in one direction; a spring connected to said element for rotating the saine in the other direction; and a brake device for retarding the second-named rotary movement of said element.

vertically-movable switchv member; of a r0- tatable element upon which the switch member rests having a cam arranged to operafor rotating said element in one direction; ai spring connected to said element for rotat- -ing the same in the other direction; anda brake device for retarding the second-named rotary movement of said element embodying a plurality of yielding elements connected to said element for rotation therewith, and a stationary member frictiona'lly engaged by said yielding elements.

4. In a switch, the combination, with a vertically-movable switch member; of a rotatable element upon which the switch member rests having a cam arranged to operatively engage said switch member; means for rotating said element in one direction; a spring connected to said element for rotating the same in the other direction; and a brake device for retarding the Second-named rotary movement of said element embodying a plurality of vertically-disposed rubber studs carried by said element for rotation therewith, and a stationary plate frictionally engaged by said studs.

5. In a switch, the combination, with an endwise-movable vertical switch member; of a rotatable element arranged beneath the switch member and provided with a cam adapted t0 engage said switch member and having oppositely-beveled ends and an intermediate straight portion; means for rotating said element in one direction; a i spring connectedk to said element for rotat- 3. In a switch, the combination, with a tively engage said switch member; meansl ing the same in the other direction; and a brake device for retarding the second-named rotary movement of said element embodying a plurality of yielding elementsconnected to said element for rotation therewith, and a Stationary member rictionally engaged by said yielding elements.

6. In a switch, the combination, with a vertically-movable switch member; of a rotatable element upon which the switch mem* ber rests having a cam arranged to operatively lengage said switch member; means for rotating said element in one direction; a spring connected to said element for rotating the same in the other direction; and a brake device for retarding the second-named rotary movement of said element embodying a plurality of yielding elements connected to said element for rotation therewith, a stationary member frictionally engaged by said yielding elements, and means for regulating the pressure exerted by said yielding elements upon said stationary member.

In testimony whereof we have hereunto set our hands in presence of two subscribing witnesses.

ALBERT KIELBLOCK. HERMANN DITTMANN.

Witnesses ERNST EBERHARDT, Hnnwie HFFNER.

Copies yo1.' this patent may be obtained for ve cents each, by addressing the Commissioner of Patenti,

Washington, D. C.