US931175A - Safety elevator mechanism. - Google Patents

Description

H. O. BARNES. SAFETY ELEVATOR MECHANISM. APPLICATION FILED EBB. 1a, 1909.

931,175. Patented Aug.17,-1909.

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H. 0. BARNES.

SAFETY ELEVATOR MECHANISM.

APPLICATION FILED 313.18, 1909.

931,175. Patented Aug. 17, 1909.

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UNITED STATES HARRY O. BARNES, OF LANSING, MICHIGAN.

SAFETY ELEVATOR MECHANISM.

Specification of Letters Patent.

Patented Aug. 17, 1909.

Application filed February 18, 1909. Serial No. 478,630.

To cI ZZ whom it may concern:

lie it known that I, HARRY O. BARNES, a citizen of the United States, residing at Lansing, in the county of fnghani and State of Michigan, have invented certain new and useful improvements in Safety Elevator life" 1illll$i11l,()f which the following is a speci i'ication.

The object of this invention is to provide a simple, cheap, and e'liicient automatic safety elevator device for ele aters to sound an alarm when one of the shaft doors is accidentally left open, and to this end the invention consists in providing two electrical circults so arranged that when the circuit of least resistance is broken the current will pass through the other circuit and sound the aim in, suitable devices being provided upon each shaft door and upon the car for making and breaking the circuit so arranged that the opening of a door will break the circuit and the stopping of the car at a landing will make the circuit, and thus prevent the sound- 'ng of the alarm when the car is in position before a door and the door is opened. if the car is moved from a landing without the door being closed the circuit will remain open and the alarm will be continuously sounded until the car is returned to the landing or the door closed.

'ihe invention is carried out substantially as hereinafter descril ed and shown in the accompanying drawing in which,

Figure 1 is a vertical section through an elevator well, a car or elevator cage being shown in vertical section therein; Fig. 2 is a diagrammatic view illustrating the electrical circuits and several contacts carried by the doors and car; and Fig. 3 is a similar view showing the modified form of contacts.

in the drawings the numeral 1 denotes the elevator shaft or well, 2 a car or cage, and 3 the elevator shaft doors indicated at the several lioors or landings 4:, 5, and 6. These parts are all constructed and arranged in the usual manner, the cage being provided with a door opening to register with the doors 3 at the different landings. A closed or main electrical circuit 7 is provided in which is a battery 8 or other source of electrical energy and a bell 9 or other suitable alarm, the bat tery and alarm being located in any convenient position. A shunt circuit 10 is connected across the main closed circuit 7 in such a way that the current from the battery will pass through the shunt circuit when said circuit is closed instead of passing through the entire circuit 7 and causing the alarm to sound. The shunt circuit is provided adjacent to the shaft doors with separated contacts 11 and 12 which are adapted to be connected and the circuit thus closed by a contact strip or plate 13 on the car, said contact strip engaging the contacts 11 and 12 when the car is in position at one of the landin s to discharge or take on a load. Each of the doors 3 is provided with a strip 1% having contact points 15 and 10 at its ends to engage the contacts 11 and 12 when the door closed and close the circuit.

As before described when the car is stopped at a landing in proper position to take on or discharge its load, the contact strip 13 carried by the car engages the contacts 11 and 12 in the shunt circuit 10 at that landing, and therefore when the door 3 at that landing is opened, the contact strip 14 on the door moving with it out of contact position, the circuit will not be broken and the alarm will not be sounded by the opening of the door. lint should the door be accidentally left open and the car moved from that landing, as shown in dotted lines Fig. 2 thus carrying the contact strip 13 out of engagement with the contacts, the shunt circuit will be broken and the current will then pass through the alarm and cause it to sound until the door which was left open is closed and the shunt circuit thus closed, or the car moved back to that landing and the shunt circuit closed by the contact strip 13 on the car.

If desired the contacts of the shunt circuit may be formed as shown in Fig. 3, in which short contacts 17 and 18 are secured to the wall of the elevator well adjacent to each loor 3, the contact 18 being a spring member which is adapted to be pressed into engagement with the contact 17 to make the circuit. The circuit is closed by each door by a projection or contact 19 on the door engaging the contact 18 and forcing it into engagement with the contact 17 when the door is closed, and the circuit is closed at each landing by a projecting contact device 20 on the elevator car adapted to engage the contact 18 when the car is in position at a landing, as shown in Fig. 3 at landing 5. \"Vhen the car is moved from the landing without the well. door being closed the shunt circuit is opened as the contact 18 will spring away from the contact 17 owing to the fact that it is not held by either door or car.

By the described construction a very sim ple arrangement of wiring is secured and the contact device carried by the car and doors is also very cheap and slmple 1n construc- Having thus fully described my invention what I claim is:

1. A safety elevator mechanism comprising a main electric circuit, an alarm in said circuit, a shunt circuit to cut out the alarm, an elevator car, means carried by said car to open and close the shunt circuit, doors, and means carried by said doors to open and close the shunt circuit.

2. A safety elevator mechanism comprising a main electric circuit, an alarm in said circuit, a shunt circuit provided with contacts, an elevator car, means carried by said car to close the shunt circuit when the car is at a given landing, a door, and means carried by said door at said landing to close the shunt circuit when said door is closed.

3. A. safetyelevator mechanism comprising a main electric circuit, an alarm in said circuit, a shunt circuit provided with contacts, an elevator car, a contact carried by said our to close the shunt circuit when the car is at a given landing, doors, and a contact carried by the door at each landing to close the shunt circuit when said door is closed. I

4. A safety elevator mechanism comprising a main electric circuit, an alarm in said circuit, a shunt circuit to cut out said alarm and including contacts at each elevator landing, an elevator car, means carried by said car to close the shunt circuit through said contacts when the car is at a given landing, doors, and means carried by the doors at the several landings to close the shunt circuit through the contacts of the shunt circuit when said doors are closed, the shunt circuit being opened when the car has left a given landing and the door is left ajar.

5. A safety elevator mechanism comprising a closed main electrical circuit, an alarm in said circuit, a shunt circuit to cut out said alarm and including separated contact points at each landing, an elevator car, a device carried by said car to close the shuntcircuit through said contact points when the car is at a given landing, doors, and a device carried by each door at each landing to close the shunt circuit through said contact points when the doors are closed.

6. Safety elevator niachanism comprising a closed main electric circuit, an alarm in said circuit, ashunt circuit to cut out the alarm when said shunt is closed and including separate contacts projecting into the elevator well at each landing, an eleator car, a contact device carried by said car to engage said contacts and close the shunt circuit to prevent the sounding of the alarm when the car is at a given landing, well doors, a contact device carried by a well door at each landing to close the shunt circuit through the corresponding contacts at the landings when the doors are closed.

7. A safety elevator mechanism comprising a main electric circuit, an alarm in said circuit, a shunt circuit to cut out the alarm. and means within the shunt circuit to make and break said circuit adapted to be operated by an elevator shaft door and by an elevator car.

In testimony whereof I aflix my signature in presence of two witnesses.

HARRY O. BARNES.

\Vi-tnesses GHANCEY A. Bannns, VILLIAM T. SHAW.

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