US1118347A - Plunger-elevator. - Google Patents

Description

J. S. HOYT.

PLUNGER ELEVATOR.

APPLICATION IILIID MAILIS), 1912. RENEWED MAY 2.1914

1, l 1 8,347. Patented Nov. 24, 1914.

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JOHN SHERMAN I-IOYT, OF DARIEN, CONNECTICUT.

PLUNGER-ELEVATOR.

Specification of Letters Patent.

Patented Nov. 24,191. 1.

Application filed MarchlS, 1912,Seria1 No. 684,892. Renewed May 2, 1914. Serial No. 835,998.

To all whom it may concern:

Be it known that I, JOHN SHERMAN I-IoY'r, a citizen of the United States, residing at Darien, in the county of Fairfield and State of Connecticut, have invented certain new and useful Improvements in Plunger-Elevators, of which the following is a full, clear, and exact specification.

This invention relates to plunger elevators, and has particular reference to means for automatically relieving the plunger of lifting force when it exceeds the normal upper limit of travel, so as to open the cylinder to exhaust and positively stop the car before the plunger can jump out of the cylinder. In the form of the invention herein illustrated, this result is accomplished by means of a valve which is normally closed during the ordinary operation of the elevator, but which,upon an abnormal rise of the plunger, becomes mechanically connected therewith and positively actuated thereby to open a relief or by-pass from the cylinder to the exhaust, entirely independently of the usual controlling valve and automatic limitation stop valve. Means is provided for automatically closing this valve upon descent of the plunger below the danger point.

In the accompanying drawings, Figure 1 is an elevation of a portion of aplunger elevator system embodying the invention; Fig. 2 is a cross section showing the plunger and one form of operating means; Fig. 3 shows a modification, wherein the valve controlling the relief is within the cylinder; and Fig. 1 is a cross section of Fig. 3 seen from below.

1 represents a plunger cylinder having a cylinder head and stuffing-box 9. of suitable construction, and connected adjacent the end with a to-and-fro pipe 3, which will be controlled by automatic valves and a main valve in any suitable or desired manner, not shown herein.

4 represents a plunger carrying at its upper end a car 5 of any desired construction not necessarily to be shown herein. At or adjacent the lower end of the plunger a guiding means is provided for preventing the end of the plunger from scraping and wearing on the interior of the cylinder, and also tending to lessen vibration. As herein shown, this guiding means consists of rollers 6 carried by a plunger bottom 7, the plun- :ger bottom being also provided with pro] ecting lugs 8,011eof which lugs is adapted to engage and lift the relief valve operating rod 9 when the plunger end approaches within a predetermined distance of the, top of the cylinder. When one of the lugs 8 strikes the rod 9, it, through a lever ll) and link 11, opens the normally closed valve 12 to dis charge water from the cylinder through the pipe 13. The particular location of the valve 12 and pipe 13 may be varied as desired, but should preferably be placed as close to the cylinder and in as direct communication therewith as possible, so that when operated it will positively relieve the plunger of lifting force and stop the car before the plunger can jump out of the cylinder or violently strike the cylinder head 2. As shown in Fig. 1,.the rod 9 slides through a small packing and the lever 10 is pivoted to a lug14= carried by the cylinder head 2.

15 is a spring which normally holds the valve 12 closed, so that there will be no lcak age or operation of the valve 12 during the normal operation of the elevator.

It will be seen that this invention, is not intended to operate every time the elevator reaches the upper landing, but is an emer gcncy device which will operate in case the plunger rises abnormally high, such as in case of failure of the operator to stop the car or of the automatic valve to operate. The guiding means for the end of the plunger may be varied in. details of construction or be made resilient without affecting this invention.

In Figs. 3 and 4:, the relief passage 13 extends laterally from the cylinder, and is normally kept closed by a cylindrical sleeve 18 having ports 19, being pressed down to close the ports 19 by a spring 20. The sleeve is provided with lugs 21 which are engaged by the lugs or projections 8 on the plunger and thereby the sleeve 18 lifted and the ports opened, and thereby stops the car in the manner before described.

The invention is especially useful in conjunction with plunger elevators of high rise and high speed, wherein, on account of the length and great weight of the plunger, it may acquire such momentum as to overrun the normal upper limit in case the controlling valves should not operate to cut off the supply pressure. \Vith this invention in case the supply pressure should not be cut oil, upon the opening of the valve, it would be simply discharged outside the cylinder and the plunger would stop because of its own weight.

Various changes and modifications in the details of construction and the arrangement of the parts may be made without departing from the scope of the invention.

Having thus described my invention, I declare that what I claim as new and desire to secure by Letters Patent is:

l. The combination with, a cylinder and a plunger, of means comprising a normally closed valve for opening said cylinder to exhaust, and means carried by the plunger for operating said valve at a predetermined point or" the travel.

2. The combination with a cylinder and a plunger, of means comprising a normally closed valve for opening said cylinder to exhaust, and 1 cans carried by the plunger for operating said valve at a predetermined point of the upward travel.

3. The combination with a cylinder and a plunger, of means comprising a normally closed valve located adjacent the cylinder head for opening said cylinder to exhaust, and means carried by the plunger for operating said valve at a predetermined point of the travel.

4. The combination with a cylinder and a direct acting plunger elevator, of a normally closed valve for openingthe cylinder to exhaust, and means within the cylinder and operated by the plunger at a predetermined point for opening said valve.

The combination with a cylinder and a direct acting plunger elevator, of a normally closed valve for opening the cylinder to exhaust, means within the cylinder and operated by the plunger at a predetermined point for opening said valve, and means for closing said valve upon descent of the plunger.

6. The combination with a cylinder and a plunger, of a normally closed valve connecting the cylinder with an exhaust, and

means for opening said valve when the plunger reaches an abnormal position.

7. The combination with a cylinder and a plunger, of a normally closed valve connecting the cylinder with an exhaust, and means for opening said valve when the plunger reaches an abnormal upward position.

' 8. The combination with a cylinder and a plunger, of a normally closed valve connecting the cylinder with an exhaust, means for opening said valve when the plunger reaches an abnormal upward position, and means for closing said valve upon descent of the plunger from abnormal position.

9. The combination with a cylinder and a plunger, of guiding means. adjacent the end of the plunger adapted to engage the stuliing box, a normally closed valve for opening said cylinder to exhaust, and means for opening said valve before said guiding means engages the stufling box.

10. The combination with a cylinder and a plunger, of guiding means adjacent the end of the plunger adapted to engage the stufling box, a normally closed valve for opening said cylinder to exhaust, and means operated by said plunger for opening said valve before said guiding means engages the stufling box.

11. The combination with a cylinder and a plunger, of guiding means adjacent the end of the plunger adapted to engage the stuiling box, a normally closed valve for opening said cylinder to exhaust, and means operated by said plunger guiding means for opening said valve before said guiding means engages the stuffing box. 7

12. The combination with a cylinderand a plunger, of a valve for opening the cylinder to the exterior, and means operated by the plunger for positively opening said valve.

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

JOHN SHERMAN HOYT.

lVitnesses J. S. Voosrnn, G. N. KERR.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington. D. C.

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