US1411770A - Elevator safety device - Google Patents

Description

A. w. BLEYLE AND I. J. DAVIS.

, ELEVATOR SAFETY DEVICE.

APPLICATION FILED MAY I2, 192i.

ff'. I

UNITED stares FAiENT OFFICE.

AUGUST w. ELEYLE, oF EERREEEY, AND roiaiv J. DAVIS, CFCAKLAND CALIFORNIA i n y Ay,

AsSiGNoRs 'ro ii. WARE DAWSON,

CF SAN FRANCISCO, CALIFORNIA.

ELEVATCR SAFETY DEVICE.

To @ZZ whom t may con-cem Be it known that we, AUGUSTl XF. BLEYLE and JOHN J. DAvis, citizens ofI the United States, residing at Berkeley and Oakland, respectively, in the county of Alameda and State of California, have invented certain new and useful Improvements in Elevator Safety Devices, of which the following is a specification. l

This invention relates to an elevator safety device, and more particularly to a simple construction adapted for manufacture andinstallation at little cost, and by the use of which an elevator is prevented from being operated until such-time as the elevator doors are in closed position.

By the present invention, the elevator operator is unable `to complete the elevator operating circuit until such 'time as the door latch is in locked position assuring the closing ofthe door, and precluding the opening thereof.

An object of the invention is to provide, among other things, a particular form of switch lever which is positively operated to a yposition to break the elevator controlling vcircuit by the releasing movement of the door controlling latch bolt thereby precluding the accidentalmaintaining of the circuit at suchtime as the elevator door is opened.

A. further Objectis to provide a construction wherein the latch bolt and switch lever are so constructed as to contain little metal and to be of very light weight, and which when in co-operative relation will have a positive interlock which insures the manual operation of the switch lever bythe pivotal movement 'of the latch bolt in either dierection.

A further object is to incorporate a spring contact in connection with the switch lever for completing the elevator control circuit kwhereby a positive 'Contact between the stationary Contact members within the elevator circuit line will 'be maintained.

With the above mentioned and other 'objects in view, the invention consists in the novel construction and combination of parts hereinafter described, illustrated in the accompanying drawings, and set forth inthe claims hereto appended, it being understood that various changes in thefform, proportion, size `and minor details of construction within the scope of the claims maybe rey Specification of Letters Batent.

Patented 15.11134,l 1922.

i921. seriai No. 468,904.

sorted "to without departing from the spirit or. sacrificing any of the advantages of the invention.

To more fully comprehend the invention, reference is directed to the accompanying drawings, wherein :e Y

Figure l is a view in elevation of the preferred embodiment of ourinvention illustrated with the elevator door in Vopen position.

Figure 2 is a view in end elevation taken on line 2-2 of Figure l.

Figure 3 is a view similar to Figure l with the elevator door in closed position.

Figure 4 is a sectional view taken on line 41E-e4; Figure 8, viewed in the direction of the arrow. f l

Figure 5 is a vertical sectional view taken i o n line 5*-5 of Figure 3 illustrating the vertical slot within the Vswitch lever, and the latch guiding tongue.V l*

Figure 6 is a view in front elevation of the lock casing. 1.Figure 7 is a sectional view on line 7-7 Figure 3 disclosing the stationary Contacts. Figure 8 is a view in perspective of the switch lever, and

Figure 9 is an inverted perspective view of the latch' bolt illustrating the vguiding tongue. i

Referring more particularly to the several views of the drawings wherein like charac ters of referencev designate corresponding parts, l is a door casing, and 2 is a door frame carrying one or more supporting wheels 3 which operate on the supporting door rail 4r. The door frame is moved loiigitudinally of the rail l in any suitable manner toand from thecasing 1.V Secured to the Casing l isa suitable lock case 5'. the outer face of which is open andis adapted to be closed by a removable cover plate 6 detachably secured thereto by screws or other means 7. The casing front wallfacing the 'door frame is at its lower end formed vith a latch bolt receiving openingS, and the upper wall surface ofsaid openingis inwardly turned forming a latch bolt head engaging part 9 Figures land Q of thedrawings. Secured to the inner face of the'upper wall surface of the case 5 is a piece of suitable insulating material A10 carrying on its under face the spaced statitonary contacts ll from which lead the wires l2 forming the elevator'operating Circuit. :The contacts `is `moved to closed position. The lever 16 is at its rear endmounted to swing on ahorizontal fulcrum 18 adjacent the rear wall of the lockcase 1, and the enlarged forward end of said lever is adapted to fall by gravity in `rear of the case opening Sand adjacent said opening is transversely slotted as at 19 forming the upper and lower furcations 20 and 21, between which is adapted to be received `the enlarged head of a suit-able latch bolt hereinafter described. The lower furcation is vertically slotted inwardly from its free end, as at 22, affordingparallel fingers 23 providing a guide for the hereinafter described la'tch bolt. The extreme forward end y of the upper edge of the lever 16 isprovided with a stop 24`for resting on the upper surface of the part 9 when. the free end of the lever 16 is in open position, as in Figure 1.

Pivotally mounted within its length at the Aforward end of the door frame 2 to swing on a horizontal fulcrum 24 is a latch bolt 25, the rear end of which is pivotally connected as at 26 to a vertically movable bolt operating rod ormember 27. The rod 27 is adapted to be raised in the direction of thearrow, Figure 3, in any suitable manner, either by the vehicle operator, orautomatically when it is desired to release the latch bolt 25, and the weight of the member 27 normally maintains the free forward end of the latch bolt 25 in its raised position, as

in Figures 1 and 2 of the drawings.` The forward end of the latch bolt 25, which extends beyond the door frame 2, is adapted to be projected through the casing opening 8 on the closing of the door, as illustrated in Figure 3, and said free end is provided with the1 upwardly y extending latch head 28 formed with a locking face 29 adapted to engage in rear of the substantially vertical face or surface 30 of the part 9. 0n its under surface, the free end of the latch bolt 25 is cut awayinwardly on opposite sides :from its outer end, as at 31, forming a longitudinal guiding tongue 32 adapted for reception within the vertical slot 22 in the approximately equal to the distance between adjacent surfaces of the furcations 20 and 21.

whereby the latch head when projected through, the opening 8 will be received Ain the transverse slot 19 and will occupy approximately all of the space Aafforded thereby, whereby the weight of the latch operating member, in causing the free end of the latch bolt to move upwardly, will cause a positive operation of the lever 16. Under normal conditions, the downward movement of the latch head 28 by u ward movement of the member 27 releases t e pressure against the turc-ation 20, and'permits the same to drop by gravity breaking the contact between the members 13 and 11, but should said contacts for any reason freeze and preclude the dropping by gravit ofthe lever 16, the positive movement o the Vhead 28 downwardly to enable the surface 29 thereof to clear the face 30 of the opening 8, `would cause the under cut portions 31 of the latch to contact with the lingers 23 and positively force the free end of the switch lever 16 downwardly to break the elevator operating circuit prior to such time as it would be possible to open the elevator door. By forming the guiding tongue 32 on the under surface of the free end of the latch bolt 25, and by providing the slot 22 in the lower furcation 21 of the lever 16, the guiding of the latch bolt in its proper position transversely of the lever is at all times assured and the operative movement of the free end of latch bolt is reduced to a vminimum to obtain the required movement of the lever 16.

Having thus described our invention what we claim as new and desire to secure by Letters Patent of the United States is 1. A safety lock for elevator shaft doors comprisinga lock case fixed to the door casing and provided with a latch bolt receiving opening in one wall thereof, a horizonta ly fulcrumed headedV latch bolt carried by the door to move longitudinally therewith to be projected through the case opening and interlock withthe wall thereof, a switch lever pivotally mounted at its rear end within the lock `case and with itsy Vforward end facing said case openingl and adapted to drop by gravity to a point in rear of said openingythe forward end` of said leverhaving a transverse slot affording upper vand lower parallel furcations between which said headed latch bolt is adapted to snuglyY fit on the insertion of the same within the latch bolt receiving opening whereby said lever is positively operated on its fulcrum by the swinging movement of said latch bolt, a stop on the lever, a part on the lockcase with which said stopxcontacts to limit the downward swinging movement of the lever, a pair of stationary contacts, a contactlcarried by the lever and adapted to complete the circuit between saidstationary contacts, and means Vfor normally `forcing the headed end of the latch upwardlyand to overbalance the weight of the lever whereby on the reception of said latch head within Said case opening, said lever is automatically and positively operated to make said contacts, and whereby on the lowering of said latch said lever is positively operated to break said contacts should the switch lever fail to drop by gravity.

2. A safety lock for elevator shaft doors comprising a lock case fixed to the door casing and provided with a latch bolt receiving opening in one wall thereof, a horizontally fulcrumed headed latch bolt carried by the door to move longitudinally therewith to be projected through the case opening and interlock with the wall thereof, said latch being cut away at opposite sides of its under face affording parallel shoulders forming a longitudinal guiding tongue between them, a switch lever pivotally mounted at its rear end within the lock case and with its forward end facing said case opening and adapted to drop by gravity to a point in rear of said opening, the forward end of said lever having a transverse slot affording upper and lower parallel furcations between which said headed latch bolt is adapted t0 snugly t on the insertion of the same within the latch bolt receiving opening whereby said lever is positively operated on its ful? crum, by the swinging movement of said latch bolt7 the lower furcation being vertically slotted inwardly from its free end affording parallel fingers between which said latch guiding tongue is received and on which said shoulders bear, a' stop on the lever a part on the lock case with which said stop contacts to limit the downward swinging movement of the lever, a pair of stationary contacts, a contact carried by the lever and adapted to complete the circuit between said stationary contacts, yand means for normally forcing the headed end of the latch upwardly and to overbalance the weight of the lever whereby on the reception of said latch head within said case opening, said lever is automatically and positively operated to make said contacts, and whereby on the lowering of said latch said lever is positively operated to break said contacts should the switch lever fail to drop by gravity. Y

In testimony whereof we have signed our naines to this specification.

AUGUST W. BLEYLE. JOHN J. DAVIS. Y

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