US823414A

US823414A - Fair-lead for hoisting-cables.

Info

Publication number: US823414A
Application number: US28367105A
Authority: US
Inventors: Samuel Lippincott Griswold Knox; William Elston Magie
Original assignee: Bucyrus Co
Current assignee: Bucyrus Co
Priority date: 1905-10-20
Filing date: 1905-10-20
Publication date: 1906-06-12
Anticipated expiration: 1923-06-12

Description

No. 823,414. PATENTED JUNE 12, 1906..

S. L. G. KNOX & W.- B. MAGIE.

PAIR LEAD FOR HOISTING GABLES. APPLICATION FILED 0013.20, 1905.

4 SHEETSSHEET 1.

No. 823,414. PATENTED JUNE 12, 1906. .S. L. G. KNOX & W. E. MAGIE.

PAIR LEAD FOR HOISTING GABLES. {LPPLIUATION FILED 0002.20, 1906.

4 SHEETS-SHEET 2.

PATENTED JUNE 12, 1906,

S .E L n C G Rm .T Wm X m NF m WB L .R SI A P APPLICATION FILED 00120. 1905.

4 SHEBTQ-SHEET 3 men/Z5723 Jay.-

PATENTED JUNE 12, 1906.

S L G KNOX & W E MAGIE FAIR LEAD FOR HOISTING GABLES.

APPLIUATION FILED 00120, 1905..

4 SHEETS-SHEET 4.

. ing boom, and

the power-shovel type having the invention axial alinement UNITED STATES PATENT OFFICE.

ELSTON MAGIE, OF SOUTH MILWAUKEE, WISCONSIN, ASSIGNORS TO THE BUCYRUS COMPANY, OF SOUTH CORPORATION OF WISCONSIN.

MILWAUKEE, WISCONSIN, A

FAIR-LEAD FOR HOISTING-CABLES.

To all whom, it may concern: Be it known that we, SAMUEL LIPPINcoTT l GRISWOLD KNOX, residing at Milwaukee, and WILLIAM ELsToN lVIAGIE, residing at South Milwaukee, county of Milwaukee, Wisconsin, citizens of the United States, have invented certain new and useful Improvements in Fair-Leads for Hoistin -Cables and we do hereby declare the folIowin to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The invention relates to hoisting mechanism for excavators of a type having a swing has for its object to provide a fair-lead, located at the foot of the boom, for leading the cable or cables from the point of the sheave on the boom to the winding-drum on the supporting structure, said fair-lead being so constructed and arranged with respect to the boom and the su porting structure as to easily and accurate y guide the cable or cables from'the boom to the drum in all positions of the boom. To this end the invention comprises a? sheave-stand supported upon an axis sub-i stantially parallel with one of the cable-leads and a guide-arm connected to said stand to swing the latter, said guide-arm being constrained to remain in substantial parallelism with the other cable lead or leads, whereby the sheave is caused to lie in the plane to the cable-leads for all positions of the boom.

In the accompaying drawings, Figure 1 is a partial side elevation of an excavator of applied thereto. of, showing the Fig. 3 is a plan Fig. 2 is an end view thereboom swung to one side. view showing the boom in with the supporting cara corresponding view showemploying the invention in connection with two hoisting-cables in a power-shovel in which the dipper is suspended from two points.

Referring to the drawings, a indicates the car-body of a powershovel, upon the forward end of which is supported a boom 7), which is adapted to be swung to the right and left during the operation of the shovel, as

body. Fig. 4 is ing the mode of Specification of Letters Patent. Application filed October 20,

I caused to lie in the as will be understood by those skilled in the Patented June 12, 1906. 1905. Serial No. 283,671.

art. Said boom is mounted upon the swinging table e, which in turn is pivoted upon a vertical stud g at the forward end 01* the car- 5 body, said stud finding its support in a bracket f, attached to the car-body.

In apparatus of this character it has been the practice to lead the hoisting-cable, which consists of a steel rope or chain, from the winding-drum, located upon the car-body or other support, over the point-sheave at the outer end of the boom to the bucket. Inlorder to guide the hoisting-cable as it passes onto the boom, it has usually been the cus 6 5 tom to provide two or more guide-sheaves near the base of the boom, one of said sheaves being mounted upon the boom proper and the other upon the car-body or other support. This arrangement is expensive and diflicult of maintenance and also causes considerable Waste of power and wear on the cables.

The present invention is designed to avoid the difficulties inherent in the old forms of guide-sheaves by providing a fair-lead in which a single cable-guiding sheave will be plane common to the leads of the cable or cables as they pass from the boom to the winding-drum. The improved fair-lead consists, essentially, of a framework h, journaled for rotation on a horizontal axis at one end in a bearing 71, mounted upon a suitable bracket 7' on the car-body, and at the other end upon a pin 1), in axial alinement with the bearing i and mounted in a vertical stud 0, projecting from the upper face of the stud 9, upon which the swinging table e is j ournaled. J ournaled in the opposite side plates of the frame h is the fair-lead guide-sheave n, which of course partakes of the rotary movement of said framework about the horizontal axis of the latter. In order to facilitate the free passage of the cable 0, the journal end of the frame h, which engages the bearing 11, is made hollow and the cable is passed therethrough. It will be noted that when the boom 1) is in axial alinement with the car-body a the cable 0 runs easily over the guide-sheave n; but when the boom is swun to the right or left the lateral I00 strain imposed upon the cable would tend to throw the same out of the groove in the said sheave it unless the latter were caused to move with the boom, so that it would lie in substantially the plane defined by the two leads of the cable. In order to insure the proper movement of the sheave to prevent unshipping of the cable and also to prevent any undue lateral strain being put upon the sheave, the frame h is connected with the boom, so that it is caused to swing therewith. The connection between the boom 1) and the frame h consists of a hollow forked guidearm 7c, the forked end of which is swiveled to the frame It by means of pivot-pins Z, engaging the opposite side plates of said frame, and the opposite trunnion-like end of which is attached to the boom by means of a yoke or strap m, which closely embraces the round end of the guide-arm and causes the latter to move with the boom and at the same time permits it to rotate freely therein.

In order that the fair-lead as thus constructed may operate easily and freely in carrying out its function of guiding the cable from the boom to the winding-drum and to avoid the necessity of providing loose or wabbling joints, it is desirable to so construct and arran e the parts thereof that the approximate y horizontal axis about which the frame h swings, the vertical axis of revolution of the boom, and the inclined axis of the guide-arm 7c shall intersect at a common point, which in the form of the invention illustrated lies in the axis of the pivot-pins Z, connecting the guide-arm is with the frame 71. With this arrangement there is no wa'bblin motion at the joint where the guide-arm c engages the boom, and the only movement of the guide-arm is one of rotation in the bearin -strap m on the boom.

n certain types of excavators wherein the dipper is suspended and operated by means of two cables attached at separate points on either side of the axis of the boom and said cables are led over the point-sheave along the boom to a double-groove winding-drum on the car-body it is essential that the fair-lead be provided with a sheave to accommodate both cables in order that the cables may run side by side and be accurately guided as they leave the boom. To accomplish this, the fair-lead sheave is provided with two grooves, as indicated at n n in Fig. 4. With this arrangement it will be noted that when the boom is turned around a full ninety degrees from central position the planes of the two ropes Where they pass through the swivelsheave of the fair-lead willbe tilted only about forty or forty-five degrees from the vertical and that the cables will both enter and leave the swivel-sheave perfectly free from interference.

As hereinbefore described, the apparatus is applied by mounting the frame h upon the car-body and securing the guide-arm to the boom; but it is to be noted that the arrangement may be reversed without de- 6 5 parting from the invention or changing its general utility and mode of operation'that is to say, the frame h may be mounted upon the boom and the guide-arm 7c connected to the car-body, provided, of course, the relation of the parts with respect to the common point of intersection of the axes of rotation of the boom, the frame h, and the guide-arm 7c be maintained.

It will also be understood, of course, that while the invention as hereinbefore described is particularly adapted to power-shovels and like excavators it is equally well adapted to other machines employing a swinging boom carrying a hoisting cable or cables running from a drum on the body of the machine to the end of the boom, and it is intended that the claims shall be given a correspondingly generic interpretation.

Having thus described the invention, What we claim, and desire to secure by Letters Patent, is-

1. In power shovel and like apparatus having a swinging boom and in w ich the boom and supporting-body have relative movement, a hoisting-cable leading over said boom, an intermediate sheave for guiding said cable, a frame in which said sheave is journaled, and a guide-arm connected to said sheaveframe, said frame and arm being supported by the respective relatively moving arts, whereby the sheave will be caused to ie in the plane of the cable for all positions of the boom.

2. In power-shovel and like apparatus, a guide-sheave for the hoisting-cable, a frame supporting said sheaveand journaled on an axis substantially parallel with one of the cable-leads and a guide-arm connected to said frame and to the swinging boom, whereby said sheave will be caused to lie in the lane of the cable-leads for all positions of the boom.

3. In power-shovel and like apparatus, a fair-lead for the hoisting-cable, comprising a sheave-stand supported upon an axis substantially parallel with one of the cable-leads, and an arm connected to said stand and constrained to remain in substantial parallelism with the other lead of the cable, whereby the sheave is caused to lie in the plane common to both leads of the cable for all positions of the boom.

4. A fair-lead for power-shovel and like apparatus, comprising a guide-sheave mounted near the foot of the boom, and means for moving said sheave to lie in the planes defined by the cable-leads for all positions of the boom.

5. A fair-lead for power-shovel and like apparatus, frame in which said sheave is journaled mounted near the foot of the boom, and means for moving said frame to cause the sheave to lie in the planes defined by the cable-leads for all positions of the boom.

comprising a guide-sheave, a

6. A fair-lead for power-shovel and like apparatus, comprising a sheave for guiding the hoisting-cable from the foot of the boom, a pivoted frame in which said sheave is journaled, a guide-arm connected to said frame, and means for moving said frame and guidearm concurrently with the boom, to cause the sheave to lie in the planes defined by the cable-leads for all positions of the boom.

7. A fair-lead for power-shovel and like apparatus, comprising a sheave for guiding the hoisting-cable from the foot of the boom, a pivoted frame in which said sheave is j ournaled, a guide-arm connected to said frame, and means for moving said frame and guidearm concurrently with the boom, to cause the sheave to lie in the planes defined by the cable-leads for all positions of the boom, the axes of rotation of the boom, the sheaveframe and the guide-arm intersecting in a common point.

8. A fair-lead for power-shovel and like apparatus, comprising a guide-sheave for the cable as it leaves the boom, a frame supporting said sheave and j ournaled on an axis substantiallyparallel with one of the cable-leads, and a guide-arm connected to said frame and to the swinging boom, the axis of rotation of the boom, the sheave-frame and the guidearm intersecting in a common point.

9. In powershovel and like apparatus, having a pair of hoisting-cables running over a swinging boom, a fair-lead for guiding the cables as they leave the boom at its lower end, comprisin a sheave having means for guiding the ca les, and means for swinging the sheave with the boom so that said sheave shall at all times occupy a plane parallel to that of the cable-leads.

In testimony whereof we affix our signatures in presence of two witnesses.

SAMUEL LIPPINCOTT GRISWOLD KNOX. WILLIAM ELSTON MAGIE. itnesses:

RIDGELY FLETCHER, HARRY B. HAYDEN.