US1263985A - Hoist. - Google Patents

Description

T. G. WRIGHTSON & J. M. RINGQUIST.

HOISTY APPLICATION FILED AUGJ. I917- Patented Apr. 23, 1918.

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APPLICATION FILED AUG-1. 19w.

Patented Apr. 23,1918.

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Specification of Letters'Patent. Pgmqgntgd App, 23, 11913;

Application filedAugust 7, 1917. serial at. 154,865.

To all whom it may concern: I

Be it known that we, THoMAs GiinMo Ds war Wn errrson and JusTUs Mne vus RING- QUIST, subjects of the King of Great Britain, both residing at Tees'dale Ironworks, Thornaby-on-Tees, England, have invented a new and useful Improvement in Hoistsfof which the following'is a specification.

This invention relates to improvements in and connected with hoists especially adapted for charging blast furnaces. In such hoists a carriage is raisedand lowered in or upon a hoist frame and supports a skip or bucket which hangs freely from it.

The object of this invention is to provision of means for preventing the swinging of the skip as it is hoisted.

According to this invention means are provided for holding the center of gravity of the skip a greater distance from the vertical line through its point of suspension than the maximum acceleration or retardation of the carriage would tend to cause such center to move.

The invention is illustrated by the accompanying drawings. Figure 1 isa diagrammatic view of a blast furnace and hoist. Fig. 2 is a side elevation and Fig. 3 a plan of a carriage and skip.

1 is an inclined hoist frame the top of which is above the mouth 2 of a blast furnace 3. 4 is a carriage which supports a skip 5 and has wheels 6' running on rails 7 on the hoist. The carriage is raised and lowered upon the hoist frame 1 by means of a hoisting rope 8 which passes over pulleys 9, 10 to a winding drum 11, the weight of the carriage and skip being balanced by a counterweight 12. The skip 5 is lowered by means of a rope 13 as hereinafter described. The rope 13 is attached to the car riage and passes around a pulley 14: to the winding drum 11.

Referring to Figs. 2 and 3, the carriage 4 consists of two crossheads 15, 16 of the width of the hoist frame 1, connected together by a toggle lever whose two members 17. 18 are pivoted together at 19, a friction roller 20 being mounted upon the pivot. The hoisting rope 8 is connected to the lower crosshead 16, and a chain 21 for supporting the skip passes over a chain wheel 22 and is also attached to thecrosshead 16.

The lowering rope 13 is attached to the and allowing the crosshead 16 to approach the crosshead 15 under the action of the weight of theskip .5. Thelowering oftlie skip to the mouth of the furnace is controlled by the rope 13. V V a y The skip is prevented from swinging by means of a lever 25, one end of which is pivoted to the carriage 4 at 26, and at the other end is a crutch 27 which embraces the skip as shown. Upon the lever 25 is a roller 28 which runs in a guide 29 on the hoist frame, the guide being so formed as to cause the crutch 27 to retain the skip 5 in the desired position in the course of usual working.

In order to facilitate the engagement of the crutch 27 with the skip 5 at the commencement of its movement, a weighted arm 30 is pivoted to a hook 31 at the end of the chain 21 by which means the skip when starting is first slightly moved away from the crutch 27.

In Fig. 2, 32 is a vertical line, while the line 33 is drawn through the point of suspension, thus illustrating the position in which it is desired that the skip should be retained. a

In our application for Patent No. 18 1,86 1, filed Aug. 7, 1917, we have shown and claimed some of the features of construction shown herein. Our claims heroin relate to improved means for preventing the swinging of the skip as it is hoisted, means being provided for holding the center of gravity of the skip a greater distance from the ver-.

tical line through its point of suspension than the maximum acceleration or retardation of the carriage would tend to cause salol renter to move.

a the center of gravity of the skip a greater distance from thevertical line through its point of suspension than the maximum acceleratlon or retardation of the carriage ,Would tend to cause such center tomove.

[end a crutch adapted to engage the skip and a guide upon the hoist frame causing the lever to hold the center of gravity ofthe skip a greater distance from the vertical line through its point of suspension than the maximum acceleration. or retardation of the carriagewould tend to cause such center to move. 1 V

3. A hoist frame, rails upon the hoist frame, a carriage traveling upon the rails, means for moving the carriage, a hook depending from the carriage, a weighted arm pivoted to the hook, a skip supported by the hook 'and'means for holding the center of gravity of the skip a greater distance from Copies of this patent may be obtained for the vertical line through its point of suspension than the maximum acceleration or retardation of the carriage would tend to cause such center to move.

4. A hoist frame, rails upon the hoist frame, a carriage traveling upon the rails, means formoving the carriage, a hook depending from the carriage, a weighted arm pivoted to the hook, a skip supported by the hook, a lever pivoted at one end to the carliage and having at its other end a crutch adapted to engage the skip and a guide upon the hoist. frame causing the lever to hold the center of gravity of the skip a greater distance from the vertical line through its point of suspension than the maximum acceleration or retardation of the carriage would tend to cause such center to move.

In testimony that We claim the foregoing as our invention, We have signed our names this 11th day of July, 1917.

T. G. WRIGHTSON. J. M. RINGQUIST.

five cents each, by addressing the Commissioner of Iatents, Washington, 1). 0.

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