US1295444A - Safety-lock for elevator-doors. - Google Patents

Description

w. E/DAY.

SAFETY LOCK FOR ELEVATOR DOORS. APPLICATION FILED JUNE 21. my

Patented Feb. 1919.

WALLACE E. DAY, or oAK AmJhoALIroRNIA, ASSIGNO To FRANK ivi. SPENCER,

DOING BUSINESS UNDER THE FRANCISCO, CALIFORNIA.

FIRM-NAME F SPEN 013m ELEVATOR C0,, OF SAN SAFETY-LOCK FOR ELEVATOR-DOORS.

Application filed June 27, 1917. Serial No. 177,283.

To all whom it may concern:

Be it known that I, \VALLAGE E. DAY, a citizen of the United States, residing at Oakland, in the county of Alameda and State of California, have invented new and useful Improvements in Safety-Locks for Elevator-Doors, of which the following is a specification.

This invention relates to the type of safety lock for elevator doors which is held against releasement until the car comes to a full stop opposite the door. In most of the prior de vices this result is attained by means of a guard released by means of a cam carried by the car, said cam being normally retracted out of the path of the guard but by means of complicated electrical mechanism projectable into the path of said guard when the car stops opposite the door.

My object is to simplify and improve the construction and operation of the releasing mechanism for the guard. While I use a cam carried, preferably, on'the car and 00-. operating with guard-releasing mechanism,

it is not a receding cam but a simple fixed obstruction at all times projected into the ath of the releasing mechanism, and in order that, when the car is passing a door but not destined to stop opposite it, the guard 80 may not be released, I provide a simple electroma et to hold the lock guard in place, notwitli standing the fact that the usual camoperated releaslng means has been actuated. The electromagnet has its circuit closed 85 through the main operating circuit for the elevator so that only when the operating circuit is broken and the car is standing in position opposite the door, can the lock be operated.

40 One form which my invention may assume is exemplified in the following description and illustrated in the accompanying drawings, in which Figure'l shows a side elevation of the lock casing, with the cover removed.

Fig. 2 shows an end elevation of the same.

Fig. is a view indiagram, illustrating the wiring arrangement of the elevator controller and the manner in whlch the move-' ment of the controller lever establishes a circuit through the lock magnet.

Referring more in detail to the drawings,

I show a. casing 10 which is fitted in place on the door frame "and co ntains the entire Specification of Letters Patent.

- serves to retain the'paw patented net. as, 1919.

lock mechanism, which comprises a pivoted 65 dog 11 forming a guard for a latch 12, the latter carried by the door and having a hookshaped end to enter the casing. Said dog has a right-angular extension rigidly formed thereon and carrying an armature 13 cooperating with an electromagne-t l4. Pivoted coaxially with the pawl 11 is a rod 15 to which is fixed at its inner end a crank arm 16 overlying the armature and at its outer end, on the exterior .of the casing, a weighted arm 17, which is fitted at its end with aroller 18 to engage and cooperate with cam track 19 on the ear or cage of the elevator. The dog 11 and its integrally formed armature are loosely mounted upon the shaft 15 between bearing extensions of the crank arm 16. The magnet is connected in series with the main operating circuit of the elevator preferably through the controller and direc tion switches not shown Normally the pawl is held in looking engagement with the latch by the action of a weighted arm. When the magnetis energized, the armature is-pulled down and the pawl held out to overlie the latch and retain the latter in locked position. A spring 20 acts on the pawl to retract it and maintain it out of engagement with the latch when the weight of arm 17 is relieved therefrom and the magnet 14 is deenergized. Normally, the weighted arm 17 causes the 5 crank arm 16 to press down on the armature 13 and thereby retain the pawl 11 in position to act as a guard independent of the action of the magnet.

In operation, when the car is near a door equipped with this lock, the cam 19 engages the roller 18 and moves the weighted arm to one side, thereby raising the crank arm 16 and taking the pressure off the armature 13 and but for the magnet 14 the :pawl 11 might be moved away from guard position under the influence of the spring 20. However, unless the car stops and the main oper ating circuit in which the magnet 14 is included becomes broken, thus demagnetizing the magnet, this will not /happen and the door cannot be unlatched. At other times when the operating circuit is broken, as when the car is standing still at other points than'the landings, then he weighted arm 1 5 in guard position. Unlatch'ng can be accomplished only when the car/is opp site the door and standing still with the main operating circuit broken, at which time both the cam 19 and the deenergized magnet/'14 are in condition to release the said pawl;

I also provide the usual. door switch so that when a door is open the car cannot be operated. This may comprise spaced terminals 21 and 22 with which a contact plate 23 cooperates to form an electrical connection across, said plate being yieldingly mounted upon and movable with a weighted lever Ql and held in contacting engagement with said terminals by means of the latch hook 12. Vv'hen the latch hook is-released the weighted arm lifts the contact plate out of engagement with the terminals and breaks the circuit. The terminals 21 and 22 of all of the lock mechanisms are connected in serieswith an operating or controlling ariangement of the several parts herein shown and described may be employed without departing from the spirit of my invention as disclosed in the appended claims.

7 It will be seen that before the car can be operated the door must be closed and locked. This is so because the complete closing and latching of the door is necessary to close the switch terminals 22-23, and the first effect of actuating the starting button of the controlling circuit is to energize the magnet 1d and thereby move the pawl 11 into place above the latch. Without the magnet 14 the door would remain unlocked until the roller g 18 had left the cam 19, which'ordinarily would not occur until the car was a foot or I so above or below the landing.

Having thus described my invention, what I claim-and desire to secure by Letters Patent is 1.. A safety lock for elevator shaft .doors comprising a lock case fixed to the-door .frames and having a bolt opening through the side wall thereof, a latch bolt carried by allowed to swing out of engagement with the bolt, a main controller, an electric controller circuit, an electromagnet within the case, an

electric circuit for said magnet adapted to be closed by movement of the controller arm, means actuated by the bolt upon its entrance to and engagement with the case to estabish said electric controller circuit, and separate means controlled by the magnet for above said bolt and positioned within the I case, gravity means for normally holding the detent in an obstructing position above the bolt, a spring men'iber opposing said 7 gravitv means-positive means carried by an elevator car to swing the gravity means from its holding position when the car is in register with the doorway of the elevator shaft, and a separate member adapted to be controlled by the electromagnet to swingthedetent into an obstructing relation to the bolt when the magnet circuit is closed.

3. An elevator lock comprising acase, a

said spring and normally holding the de-.

tent in an obstructing position above said latch bolt, positively operated means carried by an elevator 'car whereby the weight upon the detent may be relieved to allow it to swing from above the bolt, a switch adapted to beclosed by the presence of the bolt within the case, a magnet disposed in relation to the detent to influence it when energized, and an electric circuit including said magnet and adapted to be controlled by the movement of the main controller of the elevator, whereby the detent may be independently, operated to swing into a locking position.

l. A safety lockfor elevator shaft doors 'loclrbolt adapted to project into and encomprising a lock case having a bolt opening through the side wall thereof, a latch bolt adapted tobe projected into said case and-to positively engage the wall thereof, a.

lever shaft disposed transversely of the case and above the bolt, a bellcrank freely mounted upon said shaft and disposed with one of its arms extending downwardly in an obstructing position above the lock bolt, a spring normally holding said arm out of engagement with the lock bolt, an electromagnet disposed in position to influence the opposite arm of the bell-crank to swing the first named arm into its obstructing position above the bolt, gravity operated means fi-Xed to said shaft and adapted to normally hold the bell crank in'its obstructing position, a switch closed bv the presence of the lock bolt within the case whereby the circuit through ont oi an obstructing an elevator controller circuit may be completed, and means carried by the elevator car to relieve the bellcraisk from the pressure of the gravity means ndependently of the action of the electromagruet.

f. A lock for elevator doors comprising a case having an opening through the side wall thereof a latch bolt -t-arried by the door and adapted to be projei led into and to positively engage the case. a detent within the case, a pivot shat't ev'z-nding transversely ot' the ease and suppo ting the detent above the lock bolt and in a position to obstruct the removal of said boll trom the case, a spring acting to normally h ld said detent: positioe. an armature formed integral with said o' tent and extending in a substantially horizontal plane. anelectromagnet disposed beneath the armature to intiuence it in a downnard direction, a crank arm tixed to the pivotshat't independently ot' the detent and armature, a counterweight arm fixed to said shaft exteriorly of the case and adapted to exert a downward pressure upon. the arn'iature by the crank arm, a roller upon the end of said counterweight arm, a cam member carried by the elevator 'ear and adapted to engage the roller to relieve the'weight of the counterweight from the top of the armature a controller circuit switch adapted to be closed by the oresence of the lock bolt within the ease, and a separate electric circuit ineluding the magnet, whereby the movement of the controller of the c; r to close its circuit will cause the detent to be swung out-- wartlly by the action of the magnet to prevent the removal of the bolt from the case irrespective of the action of the counter weight arm.

6. An elevator door lock comprising a lock case... an electric switch member within said case, gravity means for normally holding said switch opem an electromagnet, an electric circuitaincluding the magnet, a latch bolt adapted tb be projected through an openingin the wall of the lock case to engage the same and to close said switch, a pivoted detent disposed above said bolt gravity means tor normally holding the detent in an obstructingposition above the bolt, a yieldable member opposing said gravity means,'-positive means carried by an elevator car to swing the gravity means from its holding position when the car is in register with the doorway of an elevator shaft, and means adapted to be controlled by the electro-inagnet to swing the detent into obstructing relation to the bolt when the 1nagnet circuit is closed.

In testimony whereof I have hereunto set my hand in the presence of two subscribing; witnesses.

WALLACE .DAY. llitnesses:

W. \V. Her-nan", F. H. MEYER.

Images