US2249900A

US2249900A - Extension ladder and elevator

Info

Publication number: US2249900A
Application number: US301568A
Authority: US
Inventors: Honig Morris
Original assignee: Individual
Current assignee: Individual
Priority date: 1939-10-27
Filing date: 1939-10-27
Publication date: 1941-07-22
Anticipated expiration: 1958-07-22

Description

July 22, 1941. j M. HONIG 2,249,900

' EXTENSION LADDER- ANDv ELEVATOR I Filed Oct. 27, 1939 2 Sheets-Sheet 1 IIEVENTOR I MW new ,6 15m ATTO R N E'.Y

July-22, 1941*. M, HON; 2,249,900

EXTENSION LADDER AND ELEVATOR INVENTOR 4? gem/W ATTORN EY Patented July 22, 1941 UNITED STATESPATENT OFFICE EXTENSION LADDER. AND ELEVATOR.

Morris Honig, New York, N. Y.

Application October 2'7, 1939, Serial No. 301,568

Claims.

My invention relates to extension fire ladders and elevators effective to remove people from burning buildings and more particularly to extension ladders and elevators mounted on portable trucks and where a car is employed to carry the people therein down from the building to the ground.

One of the features of this invention is to provide an elevator that can be adjusted to various heights to suit the height of the building on fire, so that people can be removed from different floors through the windows or other openings.

Another feature is the electrically driven mechanism employed to raise and lower the ladder portion of the device, and the ladder portion being used as runways for the elevator members and the car.

Another feature is the method of using a single motor to raise and lower the car and ladder, and means to select one or the other operations at Will.

Another feature is the safety device associated with the car, effective to prevent the same dropping in the event the cable breaks, or an emergency arises whereby the cable does not hold the car in its elevated position.

Another feature is the device for locking the car in elevated position on its runways independently of the motor.

Another feature is the device for adjusting the vertical position of the car irrespective of the angularity of the ladder portion.

The truck upon which the elevator is mounted is shown diagrammatically in Fig. 1. Any well known type of truck can be used which has an open top, to permit the elevator parts to be brought into -a lowered position, to facilitate its transportation from place to place where its use is required, and one feature of this invention is the means whereby the elevator runways are raised from the truck to operative positions and returned thereto after use.

Referring to the drawings:

Fig. l is a side view of the elevator looking at Fig. 2 from the left of section line l-I.

Fig. 2 is a view of Fig. 1 looking from the right at section 2-2.

Fig. 3 is a detail view showing the hoisting mechanism shown at the bottom of Fig. 1 looking at the same from the left.

Fig. 4 is a detail of the part of the device shown at the upper part of Fig. 1.

Fig. 5 is a side view of the car partly in section through 5-5;

Similar numbers apply to the same parts throughout the several views.

The equipment consists essentially of the portable truck, the extensionable ladder forming runways or tracks, th car and its truck which runs on the tracks, the safety feature carried by the car, and the lifting mechanism for extendingthe ladder and raising or lowering the car.

The truck l may be of any well known kind mounted on wheels and usually driven by an internal combustion engine pivoted to the truck. At a shaft 2 is mounted the lowest section of the ladder, this consists of two U shaped channel members 3 with their open sides facing each other. Slidably mounted in this section are a pair of similar channels 4 of smaller size to move freely therein and telescope therewith. The flange 6 of the channel 4 is of the proper height so it does not extend above the height of the flange 5 on the channel 3.

This construction forms a ladder of two sections. Obviously ladders of any number of sections can be similarly assembled to extend any desired height.

On the front side of the section and secured to the flanges 6 are ladder rungs 5, and on the rear of the sections are mounted the car 51 secured to a truck running on the flanges 6 and also the mechanism 8 for raising and lowering the upper sections and also the car 51.

On the front of the lower section and at the top thereof, is mounted a rotatable shaft 8 having bearings at each end secured to th flanges 3. At the center of th shaft 8 is a pulley 9. Similarly, at the top of the upper section is rotatably mounted a shaft 10 having bearings ll secured to the channels 4. At the center of the shaft it is mounted a pulley [2.

The raising and lowering mechanism is mounted on the flanges 3 at the lower rear side of the lowest section. The motor I3 has an electric brake I1 and a bracket [6 for supporting the motor [3 is secured to the flanges 3. The motor shaft 2!] drives a worm 2| meshed in two worm wheels l4 and I5 rotatably mounted on shafts l8 and I9 respectively, having bearings in the bracket H3 at one end and in a frame 21 at the other which members are also secured to the I flange 3.

Clutches 28 and 20 are mounted on the shafts l8 and I9 respectively and longitudinally slidable upon the shafts l8 and I9 respectively. The clutch 28 engages with the worm wheel M, to rotate the shaft [8 and similarly the clutch 29 engages the worm wheel l5 to rotate the shaft I9. Mounted on the shaft I8, and secured thereto, is a drum 22 so that when the clutch 28 engages the worm wheel I4 the drum 22 is rotated. Mounted on the shaft I9 and secured thereto is a smaller drum 23 so that when the clutch 29 engages the worm Wheel I 5 the drum 23 is rotated. The

drums

22 and 23 are driven in one direction or th other according to the direction of rotation of the motor I3.

In order to be able to disconnect the motor from use with one drum and use it on the other andstill hold the ladder or the car as the case might be, in its adjusted position, a frame 26 is provided, secured to the flanges 5, and through which the shafts I8 and I9 pass. Mounted on the frame 26 are

bosses

30 and 3|, where the holding the

drums

22 and 23 in set position.

The clutches have splines 32 on either side thereof. The splines 32 on one side of the clutches engage depressions A3 in the worm gears I4 and I5 while the splines 32 on the other side engage the ratchet faces of the bosses 30 and SI.

In order to be able to shiy the clutches away from the worm wheels I4 and I5 into engagement with the

stationary bosses

30 and 3| without clashing, the distance from the outer ends of the splines 32 on the two sides of the clutches, is less than the distance between the ratchet faces and the worm wheels.

Each clutch is moved by a lever 34 pivoted at 35 to a bracket 36 integral with the frame'26. The outer end of th lever'is provided with a yoke 31 having a pin 38, at each end thereof, operating in a groove, in the periphery of the rotary member of the clutch.

The cable 24 passes upwardly over an idler 39, mounted on a shaft 45 rotatably supported by the flanges 3, and then over the pulley 9 and down to the lower end of the upper section when it is secured thereto. It is seen that when the drum 23 is rotated, the upper section is raised or lowered according to its direction of rotation.

We will now consider the car 51 and its associated members. The car 51 i rectangular in form and is guided by plates 44, being pivoted thereto by a shaft 4|, passing through the upper part of the car 51. The shaft 4| is supplied with rollers 42 at each end outside the car. The two rollers 4! run upon the outside of the flanges 6 as tracks. Upon the inside of the flanges 6 another pair of rollers 43 are pivoted to the plate 44 the same as rollers 42'and 43. It is seen that the plates 44 and

rollers

42, 43, 45 and 46 form a truck to guide the car 5! in its vertical movements.

In as much as the ladder sections may be adjusted in use at different angles, a provision is made to adjust the car 51 into a true vertical position as follows. A bracket 5'! is secured to the side 48 of the car' 51, rotatably mounted therein is a threaded bolt 56 having a worm wheel 49 threaded thereon, Engaging the wheel 49 is a worm 50 also journaled in the bracket 47, and mounted securely to a shaft 5|, having a hand wheel 52 at the outer end thereof. The shaft 5| runs through the car 5'! to the opposite side where a similar adjusting device is secured, whereby both sides of the car can be simultaneously adjusted.

The bolt 56 is supplied with a head 53 having a slot 54 through which passes a pivotal stud 55 secured to the plate 44. By turning the hand wheel 52 the position of the car 51 can be adjusted into a vertical position irrespective of the angle of the ladder sections.

To prevent the car 51 dropping, in the event of the cable 25 breaking, a bar 58 is movably held at the top of the car 51 by a bracket 59 at either side of the car 51. These brackets 59 are secured to the car 51 and provide a limited vertical movement of the bar 58 with reference to the car. The cable 25 is secured by a strap I50 bolted to the middle of the bar 58. As the weight of the car 51 and all of its parts are supported by the bar 58, the normal position of the bar is at the upper limit of its movement in the strap 59.

Pivoted to the outside of each plate 44 at 64, is mounted a bell crank having a long arm 62 and a short arm 63. The long arm 62 is pivotally secured to the bar 58 by a pivotal connection 65 bolted to the bar. The short end 63 of the bell crank is mounted close to, but not touching, the flange 6 in normal operation. To the outer end of the long arm 62 is secured one end of a spiral spring 66 the other end of which is secured to a bracket 61 mounted on the sides of the car 51. It is seen that in the event of the cable 25 breaking, the springs 66 draw the bar 58 downward, thereby rotating the bell cranks 62, on their pivots 64, and bringing the short arm 63 against the flanges 3 with a pressure depending upon the strength of the springs 66. The friction between the short arm 53 and the flange 6 prevents the car 51 from dropping.

In order to raise the ladder sections to various operating positions many well known mechanisms may be employed. In Fig. 1, however, is shown one method. The channels 3, at their lower end are secured to the shaft 2, which is rotatably mounted in the truck I. Upon the shaft 2 is mounted a worm wheel 68, with which is meshed a worm 69, mounted on a motor shaft ID, of a motor I I, mounted on the truck I.

In order to control the motor I3 to raise or lower the car 51 or the upper section of the ladder, a switch is mounted on the inside of the car 57 as shown in Fig. 1. The switch consists of a movable arm I5 pivoted at I3 to the car 51. One end of the arm I5 moves over and contacts with terminals I9, which are electrically connected to the motor I3. Moving the arm I5 downwardly starts the motor and lowers the car 51 and vice versa.

In order that the car will automatically stop when it arrives at its upper or lower limit of travel, a T shaped member is pivoted to the car 51, the cross arm I5 of which is connected by links I8, to a corresponding cross arm integral with the switch arm 'II. The long arm of the T shaped member extends between the

flanges

5 and 6 and the plates 44 and is moved to its central, or off position, by engaging a pin 8I as it reaches its upper limit of travel and likewise a pin 82 at its lower limit. The position of the switch as shown in Fig. 1 indicates that the operator has set the switch to lower the car 51. When the car 51 is at rest the switch arm I5 will be in a horizontal position.

After the sections of the ladder are raised to the desired height, the clutch 29 is thrown into the position shown in Fig. 2 thereby locking the sections in fixedposition. In order to operate the car the clutch 28 is engaged with the worm wheel l4 and the switch arm isthen shifted from its horizontal position up or down as required. In order to check the motor l3 in'its movements an electric brake I! is mounted on the end thereof.

Many deviations from the detailed construction given herein may occur to anyone skilled in this art, without departing from the spirit or scope of the invention. Having disclosed one method of embodying the invention whereby anyone skilled in the art to which it pertains can make and use the same, what I claim as my invention and wish to cover by. Letters Patent is as follows.

1. An extension elevator, including telescopic sections, a motor actuated cable associated with adjacent sections for determining their extension, a truck including wheels bearing against the sections, a shaft passing through opposite wheels on said truck, a car, through which said shaft passes, and on which the car is adjustably mounted, and means for adjusting the juxtaposition of the car with reference to the sections.

2. An extension elevator having telescopic sections mounted on a vehicle, means on the vehicle for raising and lowering the sections into operative position, a car mounted on and effective to be raised and lowered on said sections including a plate on either side of the car pivoted thereto at the top of the car, a plurality of wheels, journalled on said plate and engaging the sections to track thereon and means for adjusting the juxtaposition of the car and plates. v

3. An extension elevator having telescopic sections mounted on a portable vehicle and pivoted thereto, means for adjusting the inclination of the sections when elevated, a car riding on said sections including a worm, a worm wheel meshed therewith, a bolt threaded in said wheel, a bracket holding the worm and wheel to the car and ahead on the bolt and a carriage riding on said sections to guide the car and to which the head of the bolt is secured, for adjusting the vertical position of said car independent of the inclinations of said sections.

4. In combination with an extension elevator including telescopic tracks in sections, means to adjust the same and a car movable on said tracks, of mechanism to raise and lower said car, including a rotatable drum, a cable wound thereon and connected to the car, a motor for rotating the drum and a single means for connecting and disconnecting the motor from the drum and looking the same in stationary position when the motor is disconnected therefrom.

5. In combination with an extension elevator including telescopic tracks in sections, means to adjust the same and a car movable on said tracks, of mechanism to raise and lower the car including a rotatable drum, a shaft on which the drum is mounted, a cable wound on the drum and connected to the car, a motor for rotating the drum, and clutch members to actuate the car, mounted on the shaft, including a reciprocating manually movable member mounted on the shaft and rotated thereby, mounted between a rotatable mem ber mounted on shaft, driven by the motor, and a stationary member with which the reciprocating member engages for holding the same from rotating and thereby locking the car in fixed position.

6. An elevator including a pair of spaced channel beams, a car mounted between the wheels carried by the car bearing against the beams as tracks, a motor effective to actuate the car, a drum driven by the motor having a cable wound thereon and secured at one end to the car to actuate the same, a shaft upon which the drum is rotatably mounted and rotated by the motor, a drum driving gear driven by the motor mounted on and free to rotate upon the shaft, and a slidable clutch member mounted on the shaft effective to prevent the drum from rotating when disconnected from the gear.

7. The combination with a hoisting mechanism, an extension elevator including adjustable sections, and'a car raised and lowered on the same by said mechanism, of hoisting means in cluded in said mechanism for adjusting the height of the sections, including a drum driven by said mechanism, a cable wound on the drum and secured thereto at one end and secured to the upper section at the other, for raising and lowering the same, a second hoisting means, also included in said mechanism, to raise and lower the car, including a drum driven by said mechanism, a cable wound on the drum and secured thereto at one end and secured to the car at the other end for raising and lowering the same, a worm wheel secured to either drum for rotating the same and a common driver for both gears, including a single worm meshed in both gears, and a motor on the worm shaft for driving the same.

8. The combination with a hoisting mechanism, an extension elevator including adjustable sections, and a car raised and lowered on the same by said mechanism, of hoisting means included in said mechanism for adjusting the height of the sections, including a drum driven by said mechanism, a cable wound on the drum and secured thereto at one end and secured to the upper section at the other, for raising and lowering the same, a second hoisting means, also included in said mechanism, to raise and lower the car, including a drum driven by said mechanism, a cable wound on the drum and secured thereto at one end and secured to the car at the other end for raising and lowering the same, a worm wheel secured to either drum for rotating the same and a common driver for both gears, including a single worm meshed in both gears, and selecting mechanism associated with both hoisting means and common driver to connect either hoisting means therewith and a motor on the worm shaft for driving the same.

9. The combination with a hoisting mechanism, an extension elevator including adjustable sections, and a car raised and lowered on the same by said mechanism, of hoisting means included in said mechanism for adjusting the height of the sections, including a drum driven by said mechanism, a cable wound on the drum and secured thereto at one end and secured to the upper section at the other, for raising and lowering the same, a second hoisting means, also included in said mechanism, to raise and lower the car, including a drum driven by said mechanism, a cable wound on the drum and secured thereto at one end and secured to the car at the other end for raising and lowering the same, a worm wheel secured to either drum for rotating the same and a common driver for both gears, and manually operated mechanism associated with each hoisting means eifective to connect the same into operative engagement with the,

common driver and a motor on the worm shaft for driving the same.

10. In a fire escape device, a ladder, means to raise and lower the same at different angles, a carriage including wheels to run on said ladder, a car pivotally connected to said carriage, manually operated means included in the car to adjust the angular relation between the car and the carriage and means to raise and lower the carriage on said ladder.

11. In a fire escape device, a ladder, means to raise and lower the same at different angles, a carriage including a pair of spaced side plates between which the same is mounted, a plurality of shafts connecting the'plates and extending beyond the same, and a wheel journaled on each extension, effective to run on said ladder, a car pivotally connected at the top to said carriage, means to adjust the angular relation between the car and the carriage and means to raise and lower the carriage on said ladder.

Y 12. In a fire escape device, a ladder, means to raise and lower the same at different angles, a carriage including a pair of spaced side plates, a plurality of shafts connecting the same and extending beyond the plates, and a wheel journaled on each extension, effective to run on said ladder, a car pivotally connected at the topto said carriage by one of said shafts, means to adjust the angular relation between the car and the carriage and means to raise and lower the carriage on said ladder.

13. In a fire escape device, a ladder, means to raise and lower the same at different angles, a

carriage including apair of spaced side plates, a plurality of shafts connecting the same and extending beyond the plates, and a wheel journaled on each extension effective to run on said ladder, a car pivotally connected to said carriage by one of said shafts passing through the upper portion of said car, means to adjust the angular relation between the car and the carriage and means to raise and lower the carriage on said ladder.

14. In a fire escape device, a ladder, means to raise and lower the same at different angles, a carriage to run on said ladder, a car pivotally connected at the top to said carriage, means to adjust the angular relation between the car and the carriage, including a bolt secured at one end to the carriage and a nut, rotatably journaled in the car, engaging the opposite end of said bolt, and means to raise and lower the carriage on said ladder.

15. In a fire escape device, a ladder, means to raise and lower the same at difierent angles, a carriage to run on said ladder, a car pivoted to said carriage and means to adjust the angular relation between the car and carriage, including a bolt secured at one end to the carriage and a nut, rotatably journaled in the car, said nut, constituted by a worm wheel, a worm engaged therewith and means to rotate said worm, and means to raise and lower the carriage on said ladder.

MORRIS HONIG.