US1264894A

US1264894A - Electrically-operated wihch, specially applicable as an ash-hoist.

Info

Publication number: US1264894A
Application number: US86074214A
Authority: US
Inventors: George F D Campbell
Original assignee: Individual
Current assignee: Individual
Priority date: 1914-09-08
Filing date: 1914-09-08
Publication date: 1918-05-07
Anticipated expiration: 1935-05-07

Description

e. F. 0. CAMPBELL ELECTRICALLY OPERATED WINCH, SPECIALLY APPLICABLE AS AN ASH HQIST.

APPLHIATION FILED SEPT. 8, I914.

Patented May 7', 191 8.

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APPLICATION FILED SEPT- 8. I914. I Patented May 7,1918.

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APPLICATION FILED SEPT. 8. 1914.

Patented May 7,1918. I

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APPLICATION FILED SEPT. 8. X914- Patented May 7,1918.

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only by the electro-motor through a friction IINITEU @TATEd PATENT UlFFImEi GEORGE F. D. CAMPBELL, 0F BOOTLE, NEAR LIVERPOOL, ENGLAND.

ELECTRIGALLY-OPERATED WINCH, SPECIALLY APPLICABLE AS AN ASH-HOIST.

Application filed September 8, 1914. Serial No. 860,74?

I To all whom it may concern:

Be it known that I, GEORGE F REDERICK DOUGLAS CAMPBELL, a subject of the King of Great Britain, and residing in Bootle, near Liverpool, in the county of Lancaster, England, have invented a certain new and useful Improved Electrically- Operated Winch, Specially Applicable as an Ash- Hoist, of which the following is a specification.

This invention relates to electrically operated winches primarily intended for use on steamers for hoisting ashes, and relates to that type of winch in which the winch barrel is adapted to be operated in one direction drive controlled by a hand lever which is also adapted to apply a brake to the drum.

According to the present invention the friction drive comprises a belt pulley driven by the motor, a belt pulley on the winch barrel and a normally slack belt connecting these two pulleys and provided with a jockey pulley by means of the movement of which the belt may be tightened so as to transmit the motion of the motor driven pulley to the winch pulley, the winch drum being provided with a brake adapted to be manipulated in conjunction with the belt tightening means by a common operating handle.

In the preferred form the movement of the operating handle is so transmitted to the jockey pulley which controls the belt tension and the brake band respectively, by separate rods and lovers to insure effective control and cooperation of these two parts.

The invention also comprises means for preventing too rapid lowering or over-running.

The invention is illustrated in the accompanying drawings in which Figure 1 is an. elevation in section on the line I, I, of Fig. 2, which is a side elevation in section on the line II, II, of Fig. 1. Fig. 1 is a detail.

Figs. 3 and 4 illustrate the auxiliary brake, Fig. 3 being an elevation partly in section on the line III, III, of Fig. 4, and Fig. 4 bein a front elevation in section on the line I IV, of Fig. 3'.

Fig. 5 is a view of the device for preventing ov'er-running and Figs. 6,7 and 8 are detail views. i f v A is the main casing within which the an inspection door a and with attachment Specification of Letters Patent.

Patented May "7,- 191%.

and is therefore not further referred to herein.

The shaft 6 of the motor has keyed to it a spur pinion If which gears with the internal teeth on the driving pulley C mounted on the shaft 0 carried in ball bearings c in the main frame, said bear ings being protected by inspection and lubrication caps 0 D is the winch drum on which the hauling rope 10 (Fig. 5) is wound; this drum is mounted on a shaft (Z journaled in ball bearings 6Z2 carried in the main frame; keyed to the shaft (Z is the driven pulley E which is in line with the driving pulley O, and both E and C are flanged so to retain the transmission belt J in position thereon; F is the brake block which may be made integral with the driven pulley E.

The jockey pulley G is also a flanged pulley and is carried from a swinging frame 9 pivoted on the fixed pin 9 The frame 9 has two arms between which the jockey pulley is housed, which arms are connected by a shaft g which carries the inner races of the ball bearings on which the jockey pulley runs.

II is a flanged guide pulley the object of which is to prevent the belt J, when the tension in it is released, from clinging to the pulley C. The pulley H is carried by a lever k pivoted at [b2 and is adjustably held against the belt by the adjustable screw 71,3 carried in the bracket h The brake block F is provided with a brake band 7, one end of which is attached to the bracket f pivoted on the fixed pin f and the other end of which is connected by a lug f to a slotted rod 7, the pin 7 j passing through the lug and rod (see Fig. 1 The slotted rod f has a tail f the end of which is a sliding fit in the pivoted bracket 7, and has a tubular extension 7" which is asliding fit in the bore of the nut f and is bored to clear the screwed end of the brake actuating rod M, the nut f and the locking nut f screwing on the screwed end of the rod M. The recessed nut f serves to adjust the position of the slotted rod f and pin f in relation to" the rod M, and forms a convenient means for readily disconnecting 7" from M; the rod M doesnot transmit a pull to the rod 7".

The brake actuating rod M is connected hyaiork-ended red m to one arm N of a bell crank lever, keyed to a shaft n mounted in the main frame and to which the operat" inglevel'. P is also keyed; apivotal connection between M and m being'made bythe wrist pin m The port-ion at m of the rod M is"s quared in cross-section, and the squared portion is a shdlng .fit 1n and 1s guided by a guicle block g forged integrally with the pin 9 (see Fig. 6) pivoted to the jockey pulley frame the brake actuating rod M beingheld against lateral movement by the guide block 9 but being free to move axially relatively to the said guide block. The brake band 7' is normally held, in gripping tension by a spring f interposed between the fixed bracket f and an adjusting nut 7 screwing on a screwed portion oi the tail f of the slotted rod fi, hen the operating handle P and the arm N of the bell crank lever are raised the pin a on the arm N of the bell crank lever engages with the upper end of the slot m in the forked end of the rod m this raises the brake actuating rod M, compresses the spring f and so releases the brake band. \Vhen the arm N is depressed, the tension exerted by the spring 7 prevents rotation, in the clirection indicated by the arrow, of the pulley E and Winch drum D.

Movement is imparted to the jockey pulley frame about the pivot bv means of the fork-ended rod Q which is pivoted by the pin 0 to the arm 0 of the bell crank lever, and by the pin 9 to the frame 9 When the operating handle P is depressed the farm O of the bell crank lever is raised and the pin 0 engages with the upper end of the .slot 9" in the forked end of the rod Q, this swings the jockey pulley frame in the direction indicated by the arrow, whereupon the jockey pulley engages with the belt J, increasing the tension and grip sufficiently to enable the pulley C to drive the pulley E in a dlrection the reverse of that indicated'by the arrow in Fig. 1; in the meantime the guide 9 which moves with 'the frame 9 engages the adjustable locknuts m and so lifts the rod M and disengages the brake; The preclse point in the movement of the frame 9 at'which the brake ,is released in this way 'is determined by the position of the adjustable lock-nuts m on M, and this point i'susually so selected that the tension in the belt J is sufficiently. increased by the movement of the j ockey'pulley to prevent a suspended load from dropping; 'lIt-will'be seen that in addition to the means for insuring the release of the brake that of the arrow, the brake band is released, though not quite freed from the brake block, automatically and independently of the movement of the rod M since movement'in this direction pulls the. end f upwardly and slackens the band 7' The movement of the rod ill "as described trees 7' from the brake block F.

An ordinary brake block may be fitted in place of'the brake band, but the arrange ment described gives the best results.

It will be seen that where a stationary load is held in the raised position by applying the brake to the winch and it is desired to raise the load higher, there would be, if the operating handle released the brake before sufiiciently increasing the belt tension, a brief interval during which the brake drum would be free to rotate and lower the load.

In the arrangement illustrated, however, it will be seen that the depression of the operating handle to actuate the jockey pulley does not immediately affect the brake, but that when, by this depression of the handle, the belt tension is increased sufficiently to operate the hoisting drum the brake is released; further, the direction of rotation is such as to automatically release the brake band; any tendency to rotate in the direction necessary to lower the weiglna is at once automatically checked by the tightening of the brake band unless the operating handle is raised and the brake band positively held against engagement with the brake drum. lVhen the operating handle is in its normal position the belt is slack and the brake is applied, and movement of the handle from the normal position in the one direction actuates the brake without interfering with the belt tension, while IHUVC- ment in the other direction controls the belt tension.

It would however be possible, if the operating handle were held too long in the raised position, for the load to attain a speed in lowering which might take the load out of control, and to avoid this, I fit the rope drum, the driven pulley or the brake drum with an auxiliary brake operated by a centrifugal device. This arrangement is illustrated in Figs. 3 and 4.

E is the driven pulley and a is a cylindrical extension of the main casing, which lies clear of the interior surface of the rim of the pulley and is concentric therewith.

As described the pulley E is keyed on the shaft (Z of the winch drum D, and the boss e of the pulley E is turned and a sleeve R .is keyed on the said boss by the key 7 and is held in place by the screwed ring 1*.

Two brake blocks S are fitted the semicylindrical surfaces of which are provided with a suitable friction surface s and these blocks are caused to rotate with the brake pulley being driven by theprojecting arms r which engage in suitable recesses on the inside faces of the blocks S.

Two armed disks T and V are fitted on the boss 0 one on each side of the body s of the brake blocks S; each brake block is provided with tWo studs 8 and it will be seen from an inspection of Figs. 3 and4 that the studs 8 of, say, the upper brake block, (the one shown in Fig. 3 in section on the plane III, III, of Fig. 4) are reversely set, the protruding part of the one stud passing through the arm 16 of the disk T and the other stud passing through the arm '0 of the disk V on the opposite slde; in like manner the studs on the lower brake block pass respectively through the arm t of the disk T and the arm 12 of the disk V; the holes in.

the one pair of arms (t and F) are slotted. These arm disks being fitted about the center of the shaft 03 act as links to connect the brake blockstogether and insure their simultaneous and approximately parallel movement.

Each brake block is provided with two cylindrical recesses 8 the axes of which intersect the axes of the studs s which recesses serve to house the ends of the spiral springs 8 and the studs 8 are notched in the center to take the attachment rings at the end of the spiral springs.

The tension of the springs is adjusted so that they just keep the blocks from, or just in contact with the inner surface of the fixed boss a when the speed exceeds the normal the blocks are moved out by centrifugal force, and their weights are so arranged in respect to the tension of the springs, that the speed of lowering with the maximum weight is limited by the friction of the blocks to a speed which is within control.

In order to prevent over-running, should the tension of the driving pulley be maintained for too long a period in hoisting, a spiral spring W (see Fig. 5) two or three feet in length is carried from the bracket 'w supported from the pulley e0 over which the hoisting rope e0 is carried; the lower end of the spring is attached to an end-cover w and the hoisting rope 10 is reeved through a central hole in this cover, and the spring is so carried that the rope coincides with the axis of the spring.

An adjustable engaging piece w, which may take the place of the ordinary ball weight, is clamped to the rope sothat in its top position for normal hoisting it is just clear of the cover w U Should over-hoisting take place to engages with w and compresses the spring W, the compressive strength of the spring being so proportioned that as it is gradually compressed it finally subjects the rope to a tension suflicient to cause the driving belt J of the winch to slip, thus avoiding sudden and dangerous stresses consequent upon overhoisting.

The arrangement illustrated forms the embodiment of my invention which is particularly suitable for use on board ship, but of course the arrangement and details of construction can be modified within the scope of my invention as claimed herein, in accordance with the particular purpose to which my invention is applied.

Having now fully described my invention, I declare that what I claim, and desire to secure by Letters Patent irz- 1. In a winch, in combination; an electromotor; a belt pulley driven thereby; a belt, a winch drum driven by said belt from the said pulley; a brake device on the winch drum; a belt tension adjusting device; an operating lever; and a rod connecting the belt tension adjusting device to the lever on one side of the fulcrum thereof; and a rod connecting the brake lever device to the lever on the other side of the fulcrum thereof; substantially described.

In a winch, in combination; an electromotor; a belt pulley driven thereby; a belt, a winch drum driven by said belt from the said pulley; a brake device on the winch drum; a pivoted frame; a jockey pulley carried therein and adapted when said frame is pivoted to control the tension of the belt; a control lever; a rod connecting the control lever to the jockey pulley frame; a rod connecting the control lever to the brake device; and means adapted, while permitting a limited free movement between the said frame and the brake device, to connect the said frame to the brake device; substantially as described.

3. In a winch, in combination; an electromotor; a belt pulley driven thereby; a belt, a winch drum driven by said belt from the said pulley; a brake block; a spring; a brake band encircling the said brake block, one end of which is fixed and the other end of which is caused to grip the said brake block by means of said spring; a pivoted frame; a jockey pulley carrier therein and adapted when said frame is pivoted to control the tension of the belt; a control lever; a rod connecting the control lever to the jockey pulley frame and adapted when the lever is moved in the one direction to press the jockey pulley against the belt; a rod connecting the movable end of the brake band to the control lever so that when the latter is moved in the opposite direction it releases the brake; substantially as described.

4. In a winch, in combination; an electromotor; a belt pulley driven thereby; a belt, winch drum driven by said belt from the oted to increase the belt tension; a common operating lever and means connected to said common operating lever for operatmgthe jockey pulley trame and for operating the brake rod; substantially as described.

In a winch, in combination; an electromotor; a belt pulley driven thereby; a belt, a winch drum driven by said belt from said pulley; a belt tension adjusting device; a brake device on said drum; a common oper ating handle; means connecting the operating handle to the belt tension adjusting device and to the said brake; a fixed circular brake surface arranged concentrically With the winch drum; two semi-circular brake shoes connected to the winch drum so as to rotate therewith but to be capable of outward movement relatively thereto; a pair of two armed levers movable about the axis of the brake drum, adjacent ends of the respective levers being connected together by spiral springs and one arm of each lever being connected to the brake blocks; substantially as described.

6. In a winch, in combination; an electromotor; a belt pulley driven thereby; a belt a winch drum driven by said belt from said pulley; a brake device on the winch drum; a belt tension adjusting device consisting of a pivotally mounted jockey pulley; a single operating handle adapted to control the brake device and the belt tension adjusting device; and a second jockey pulley engaging with the inside of the belt and adapted when the belt tension is released to limitthe are of embrace between the belt and the motor driven pulley; substantially as described.

7. In a winch, in combination; an electroinotor; a belt pulley driven thereby; a belt, a winch drum driven by said belt from the said pulley; a brake device on the Winch drum; a belt tension adjusting device; a single operating handle adapted to control the brake device and the belt tension adj usting device; a hoisting rope coiled on the winch drum; a bracket; a fixed pulley over which the said rope passes to change its direction; a spring device one end of which is lined to the said bracket; and an adjustable stop fixed to the rope and adapted in case of over-running to engage with the free end of the said spring device and compress it; substantially as described.

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

G. F. D. CAMPBELL.

Witnesses:

J, E. LLOYD BARNES, Josnrn E. HInsH.

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