US1497602A - Elevator - Google Patents

Description

June 10,, 1924.

A. H. STEBBINS ELEVATOR Fil ed June 27, 1922 3 mm a /I\l VENTOF? fM-I. 1996M ATTOQNEY Patented June 10, 19234.

UNITED STATES pennant: it. cassettes, or nos ANGELES, caruronnra.

ELEVATOR.

7 Application filed June 27, 1922. Serial No. 571,286.

To ((1. 10/2027). i/; may concern:

Be it known that I, ALBERT H. grime-ins, a citiaen ot the United States, residing at Les Angeles. in the county of Los Angeles and State of California, have invented an,

l1nprovement in Elevators. of which the followingdescription. in connection with the accouumnying drawings, is a specification, like characters on the drawings representing like parts.

This invention relates to improvements in the construction of elevators. and more particularly to means for preventing dust from escaping from the elevator casing.

In elevators of the type in which a casing is provided having buckets moving upwardly in one portion of the casing and downwardly in another portion, the movement of the buckets produces air currents that may blow dust outwardly from the casing around the base thereof, and the part of the elevator from which dust is most likely to escape is the feed hopper.

An'in'iportant. feature of the present invention, therefore, resides in means for directing the air currents produced in an elevator by the traveling buckets so that the air currents will'not'cause dust to escape from the elevator casing.

Another feature of the invention resides in gates for controlling the passage of air through the feed hopper and discharge hopper of the elevator. V 1

Other features of the invention and novel combination of parts in addition to the above will be hereafter described in connection with the accompanying drawings which illustrate one good practical form thereof.

In the drawings:

Fig. 1 is a vertical sectional view through an elevator casing having the present inven tion applied thereto: and

Fig. 2 is a sectional view taken on the line 2-2 of Fig. 1.

The present invention is applicable to any type of elevator having a closed casing and buckets therein that move upwardly in one portion of the casing and downwardly in another portion, and in the present case an upright casing 10 is shown having a base 11 and head 12. The casing 10 may be rectangular in cross section, as shown in Fig. 2, and may be formed of spaced side walls 13 connected by end walls 14. 7

Within the casing 10 are mounted one or more endless chains 15 that pass around sprocket "wheels 1.6 and 17 mounted upon shafts 18 and 19 in the lower and upper portion respectively of the casing 10. To the chain or chains 15 are secured buckets 20 that elevate n'mterials from the lower to the upper part of the casing. Movement may be imparted to the chains and buckets by providing a gear 21 upon the shaft 19 that meshes with a gear 21 driven by a belt wheel 22. lviaterials may be supplied to the elevator through a feed hopper 23, and may be discharged therefrom through the discharge hopper 2 1.

When the buckets 20 are operated they will travel as indicated by the arrows in Fig. 1, and will scoop up materials at the bottom 11 of the elevator and discharge the materials into the hopper 24- near the upper end of the elevator and the movement of the buckets will produce air currents that travel downward; with the buckets 'in 'one portion of the elevator and upward with the buckets in another portion of the elevator. These air currents, however. usually intermingle more orless and produce local disturbing currents rather than well defined currents that travel in thedirection of the buckets.

It is found that the discharge of dust from the lower portion of the casing 10 may be prevented in accordance with the present invention, by establishing a well defined current air that travels upwardly in the portion of the casing in which the buckets 20 travel upwardly. This upward on rent of air serves to relieve the air pressure in the lower portion of the casing 10, and the same is secured by providing a partition 25 within the casing to extend longitudinally between the two runs of the buckets 20 so that the air which travels downward with the buckets in one portion of the casing is prevented from interfering with the air that travels upward. with. the buckets in another portion of the casing. The partition 25 preferably extends from near the sprocket wheel 16 at the lower portion of the casing upwardly to a position near the upper sprocket wheels 17, and extends from one side of the casing to the other as will be apparent from Fig. 2.

The discharge of dust from the lower portion of elevators is due largely to the air pressure within the lower portion of the casing, and this air pressure is produced by the empty buckets carrying air downwardly into the lower portion of the casing where the air is forced out of the buckets as it is replaced by the material that enters the buckets, with the result that an abnormal air pressure is produced in the lower portion of the casing. By constructing the casing 10 so that a well defined current of air travels upward with the rising buckets the excess air pressure in the lower portion of the casing is readily relieved.

The escapage of dust from the lower portion of the elevator casing may be further prevented by providing the feed hopper 23 with a gate 26 which serves to allow materials to enter the elevator through the hopper, but prevents air from passing outwardly through this hopper. The gate 26 may be swingingly mounted within the hopper 23 so that it will swing in one direct-ion from the position shown in Fig. 1 to admit materials but will not swing in the opposite direction. The upward flow of air within the casing 10 may be promoted by preventing the downwardly moving buckets 20 from drawing air into the casing through the discharge hopper 24, and to this end, a gate 27 is mounted within the hopper 24: so that it will swing outwardly from the position shown in Fig. 1, but will not swing inward- 1 What is claimed is:

1. In combination with an elevator casing having buckets traveling downward in one portion of the casing and upward in another portion, a feed hopper at the lower portion of the casing and having a swinging gate for preventing air from leaving the casing through the feed hopper, and a discharge hopper at the upper portion of the casing and having a swinging gate for preventing air from entering the casing through the discharge hopper. 1

2. In combination with an elevator casing having buckets traveling downward. in one portion of the casing and upward in another portion, a feed hopper at the lowerportion of the casing and having a. swin ing gate per portion of the casing and having a gate for preventing air from entering the casing through the discharge hopper, and a partition extending longitudinally within the casing and arran 'ed to prevent air from flowing transverse y of the casing from one set of buckets to another.

4;. In combination with an elevator casing having buckets traveling downward in one portion of the casing and upward in another portion, a partition within the casing be tween the runs of the buckets to prevent air from flowing transversely of the casing from the buckets moving in one direction to the buckets moving in the opposite direction, and a feed hopper at the lower portion of the casing and having a gate for preventing air from leaving the casing through the feed hopper.

5. In combination with an elevator casing having buckets traveling downward in one portion of the casing and upward in another portion, a partition within the casing between the runs of the buckets to prevent air from flowing transversely of the casing from the buckets moving in one direction to the buckets moving in the opposite direction, and a discharge hopper at the upper portion of the casing and aving a gate for preventing air from entering the casing through the discharge hopper.

In testimony whereof, I have signed my name to this specification.

ALFFIZT STEBBINS.

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