US1985361A - Hoist control - Google Patents

Description

De-c. `25, 1934. w C ANTHONY Er AL 1,985,361 I y HoIsT CONTROLI Filed June 1, 1951 2 Sheets-Sheet 1 Patented Dee. 25, 1934I PATENT OFFICE -nols'r CONTROL william o. Anthony and Lester Wachter, stream,

Ill., asslgnors vto Anthony Company, Streator,

Ill., a corporation ofvlllinois Application June 1, 1931, Serial No. 541,399

f 15 Claims' This invention relates-to a hoisting mechanism and to means of controlling the same.

It has forone object to provide, in connection with a hoist, means for causing a shaking effect. Such shaking eiect may be caused at one end of the excursion of the hoist.

Another object is to provide an automatic means in connection with a hoist, which may be used to raise a dumping body, whereby the body is jerked repeatedly at the upper or raised position.

Other objectswill appear from time to time A in the specification and claims.

lframe member. port the hydraulic hoisting mechanism. A9 is a .Our invention is illustrated more or less diagrammatically in the accompanying drawings, wherein:-

Figure 1 is a longitudinal vertical cross section, showing the body in the raised position;

Figure 2 is a. longitudinal vertical cross section showing a modified form of the invention;

Figure 3 is a cross sectional detail on anenlarged scale, showing a portion of the controlling mechanism of Figure 2; and

Figure 4 is a view similar to Figure 3, showing a modified form.

Like parts are designated by like characters throughout the specification and drawings.

While the hoisting mechanism and the controls therefor are not limited to use in connection with a vehicle, they may be conveniently so used and the invention is, therefore, illustrated in one form as applied to the hoisting mechanism for a dumping body, which lis mounted upon an automotive truck. A indicates generally the vehicle frame. A1 is an axle. A3 is a wheel, A3 is a cross member having bearing supports A4. A5 is a frame member having a ange A6. A7 is a cross frame member which may be made up of one or more parts. A3 is an additional cross The members A7 and A3 suptrack, resting upon flange A6. s

B is a body provided with downwardly project- .ing members B1 which, by means of pins B3,

are pivotally supported in the members A4 sothat the bo`dy may be swung up and down about the members B3; The body B may have one orvmore stiifening and supporting frame members B3 B3 and may carry a track B4 which, as here shown, is a channel member, although it might be of any suitable structure.

C is a lever assembly, preferably pivoted at C1.

I At its upper end the assembly carries a. roller C2 which lies within and is engaged by the track B4.`

The lever assembly C is provided with one or more inclined roller. contacting faces C3 the use of which will be described below.

D is a transmission housing within which drive members are mounted which are driven by the engine of the vehicle. A driven shaft D1 protrudes from the housing D and through a universalD3 drives a shaft D3. The latter, through a universal D4, drives the shaft D5 of a pump which is mounted within thehousing. D3. The pump is preferably a rotary pump, or it may be a gear pump or any other suitable means adapted to circulate the uidin lthe hydraulic system. The pump housing D3 may be integral with a housing D7 which contains a sump DB and a passage D3 through which the iiuidv moves from the pump to the'cylinder. The sump may have an open top and may be covered by a removable cover D10.

Joined to the housing D7 is a fitting E to which the cylinder E1 is fastened. A passage E2 within the member E communicates With the passage D9 within the member D7. It is provided with a ball check valve E3 which is normally seated by the spring E4 and also by pressure within the cylinder E1. It maybe unseated by pressure from v the passage D9. An outlet passage E5 is provided in the member E, and it communicates with a passage E6 which leadsto the sump D3.- The )passage is normally held closed by a ball check valve E7 which is seated by a spring E3 and by pressure within the cylinder E1. Means for unseating the valve E7 comprises a rod E9 having a flattened portion E10. The rod E3 is provided with a lever E11 to which a link E12 is pivotally fastened. By means of the lever and link the rod E9 may be rotated to move the ball valve E7 from its seat to open the passage E5y and permit escape of fluid from the cylinder. The outer end of the cylinder is closed by a member E13 which is perforated and provided with a packing E14 and a packing gland E15 which is provided with lugs E13 adapted to be engaged and held in fixed position by screws E17 which are also engaged in the member E13. The outer end of the cylinder is held in position upon the cross frame member A8 by a .U-bolt E13which passes through the member A3 and is engaged by nuts E13. E110 is a by-pass running from the outer end of the cylinder to the space E3 to return iiuid which has passed beyond the piston.

The cylinder is provided with a piston F. The

1 along the flange A11 of the track A5.

. within this perforation G is a sleeve G1 havin a collar or flange G2 at one end and an enlarge'- ment G3 at itsl other end. This enlargement is tapered along a portion of its exterior as at G and is provided with a valve seat GU. G'1 is a poppet valve adapted to be seated in the seat G5. It is fastened to a stem G1 which lies withinand lsadapted to move within the sleeve G1. G3 is a stop member fastened on the stem G1. At one end the stem G'l carries a contact member G3. A large spring G10 is positioned about the sleeve and about the valve stem. At one end the spring engages the stop G11 which is fixed to the stem G1 and at its other end the spring bears against the piston F. G11 is arelatively smaller spring -positioned about the stern G". bearing at one end against the flange G2 on the sleeve G1 and at its other end against the stop G3 on the stem G".

In the form shown in Figure l, instead of the piston construction above described for providing shaking of the body at the raised position, a different construction is illustrated. A control member H is provided by means of which the clutch may be manipulated into and out of engagement so that the pump drive may be connected and disconnected. The lever H is normally held in engaging position by a spring H1' which thus holds the clutch in engagement-to drive the pump shaft. A rod H2 is fastened to the lever H at one end and at its other end it passes through one end of a bellA crank H3. A cushioning spring H4 is provided about the outer end of the rodH2 and is held in adjusted position thereon by a nut H11 and' a washer H11. The bell crank H3 is pivoted as at H". It is laterally bent as at H11 and carries on the laterally bent portion an adjustably positioned weight H9. A spring H10 may be attached to the bell crank H3 below its pivot point, beingfastened at one end on the housing D1 and adjustably attached to the bell crank H3 as shown. Either the spring H11 or the weight H9 may be used; ordinarily one will be enough. Each of them tends to move the crank H11 into the position shown in Figure 1, and'thus to move the rod H2 to the left as shown in Figure l, so as to free the clutch lever H. Thus this lever can be moved into the engaging position by the spring H1. I is a rod attached to the bell crank H3 below its pivot point and extending to and preferably through a cross head I1 which is mounted at the outer end ofthe piston. rod F2. At its outer end the rod I is threaded as shown in Figure l, and provided with one or more nuts I3. The cross head is provided with rollers I3 adapted to run Other rollers, which in the showing of Figure 1 are masked by the rollers I3, are provided to engage the inclined face or faces C3 of the lever assembly C.

The modified form shown in Figure 4 differs from the valve construction of the other figures. In the form of this figure the piston is built up, being formed of the member J which has a flange-like extension J1 on its outer edge and an internal cylindrical extension J3. A cup-like member J11 which may be of leather or other suitable material, is held to the member J by a disk or plate J4. The member J is perforated at J11 and the'cup J11 is "perforated at J. These perforations are in line with the hollow bore ofthe member J3.

K isa, valve stem having a tapered enlarged valve portion K1. The stem is positioned within the cylindrical portion J2 and extends outwardly from it at each end. The head or valve portion K1 may be seated against the disk J4` as shown in Figure-f. The outer end of the valve stem K may contact the member E13 which closes the cylinder. A pin or other stop member K2 is positioned in the stem K. A relatively large,

-generally helical spring K3 having a tapered end is positioned about the valve' stem K and bears at one end against the piston J andat the other against thestop K3. A relatively smaller and preferably generally helical spring K1 is positioned about the stem K and may bear at one end against the plate E13 as indicated in Figure 4 and at the other end bears against the stop K2.

It will be realized that whereas we have herewith shown and described a practical operative device, nevertheless many changes might be made in the size, shape, number and disposition of parts without departing from the spirit of our invention and we wish. therefore, that our showing be taken as'in a sense diagrammatic. In particular, the construction shown in Figures'z and 3 might be modified by having the element G3 separate from the sleeve G1. If this were the case, the interior bore of the element G3 would be of substantially the same diameter as the stem Gl and would contact it. Thus the element Gr3 would slide upon the stem G1 and the sleeve G1 would merely contact the end of the element G3.

The use and operation of our invention are as follows:

In the form shown in Figure 1, when it is desired to dump or tip the body, the clutch is engaged so that the pump is driven and pressure is forced from the pump through the passage D3 into the cylinder E1, moving the piston outwardly toward the right as shown in Figure 1. As the piston approaches its outward limit, the' cross head I1 engages the nut I2 on the rod I and pulls it, thus rotating the bell crank H3,'swinglng its lower arm to the right against the resistance of spring H10, and moving the rod Hz in the same direction t move the lever H of the clutch and very .slight movement in this direction the cross head has moved `again to the left as shown in Figure 1, sufficiently to be out of contact with the nut I2 on the rod I. Thus the rod is no longer held to the right and the spring H10 or the lever H11, or both of them, if they are both used, move the lower end of the bell crank H3 to the left and remove the tension from the rod H2 and permit the spring H1 to move the clutch lever H into the engaging position. When this occurs the pump starts at once and the piston is moved again tothe full outer limit of its excursion. The back and forth movement will occur automatically and will result in relatively slight back andconseqliently. permitting. inward movement of the piston and lowering movement oi' the body.`

y In the form of the invention shown in Figures 2 and 3, the operation of the pump need not be interrupted. As, the piston .moves toward the outer limit of its excursion, the member G1 contacts the cylinder head E13 and the valve G11 'is unsea'ted, being moved into the position shown .in Figure 3. In this position no leakage through the piston occurs. Thus after the member G11 strikes the cylinder head E111 some further movement of the piston will occur, unseating the valve and compressing the spring G11. When that spring is fully compressed or when it is suiliciently compressed, it will expand and drive the sleeve G1 with the member G3 to the left, unseating it and thus opening the passage G through the piston. Suiilcient leakage can then occur through the piston to permit reverse movementof the latter and thus to cause a slight lowering of the body. .This 'reverse movement of the piston'is usually suilicient to move the'member G9 outiof contact with the cyl-` inder head E13. As soon as the spring G11 is relieved of compression, it seats the sleeve G1 and again closes the opening G13 to prevent discharge of fluid past the piston. The spring G1o also is relieved of compression since the member G9 no longer contacts the cylinder head E13 and thus the valve stem G7 with the valve is moved to`the right, seating the valve in the seat G5. As soon as these parts are seated, since the movement of the pump continues, pressure builds up and the piston is moved again to the right. The member G9 again contacts the cylinder head and the same cycle of movements is repeated, Thus, by providing an automatic means in the piston, the movement of the latter is automatically controlled soA that it moves backwards and forwards throughout a limited amount of travel. This will occur until the operator operates the controls to open the vmain. discharge from the cylinder as above described.

It will be seen thus that in the two forms of our invention we have provided means for giving the piston limited and relatively rapid reciprocation at or near the outer'end of its travel. This produces upon the body a shaking or rattling action which is frequently important in helping to discharge sticky or yother loads which tend to adhere to or remain in the body. y

The use and operation of the form shown in Figure 4 are generally the sameas that of the form shown in the earlier gures. The small spring A4 is slightly stronger than the larger spring K3 but is overcome by the combined forces of the larger spring and the oil pressure against the valve head K1. As the piston advances or moves outwardly, that is, to the right as shown in Figure 4, the small spring strikes the cylinder head and is compressed but it is not strong enough to force open the valvel against the opposition of vthe spring K3 which tends to seat the valve and the force of the oil pressure within the cylinder against the valve K1. As the piston continues to move the outward end of the valve stem K strikes the cylinder head and the valve is forced open. When this occurs, oil passes through the valve and lowers the pressure to the left of the piston, thus allowing the small spring to overcome the force of the .large spring, which opens the valve further and permits the more rapid discharge of oil through it. When this occurs pressure is not sufficient to hold the piston to the right asshown in Figure 4 and it then moves backward and as soon as the compression on the large spring K3 is suiliciently reduced, -it may expand and thus closes the valve and permits the cycle of operations to be repeated.

adapted to cause the latter to give to the bodyk repeated back and forth movement through a distance less than its maximum travel.

f Zi. In combination with a receptacle, means for moving the same in an arc from loading to dumping position; and automatic means, enclosed within a part of the moving means, the moving means, adapted to cause the latter to give to the body back and forth movement throughout a limited arc, less than the arc of movement from loadng to dumping position.

4. In combination with a receptacle, a dumping means therefor, adapted to move the receptacle from a loading position to a dumping position, and automatic means enclosed within a part oi' said dumping means for causing sad dumping means to move said receptacle rapidly repeatedly between said dumping position and a position intermediate the dumping position and the loading position.

5. In combnation with a receptacle, a dumping means therefor, and automatic means for shaking said receptacle in the dumping position, saidl means including an automatic reversing mechanism for said dumping means enclosed within a part of said dumping means, whereby the latter is caused to iluctuate back and forth repeatedly between positions near the upper limit of its excursion 6. In combination in a tipping mechanism, a receptacle, tipping means for it, and automatic means enclosed within a part of said tipping means adapted to cause said tipping means repeatedly to reverse its direction of movement, at one end of its 'main excursion, without returning to the other end of its main excursion.

7. In combination in a tipping mechanism, a receptacle, hydraulic means i'or tipping it, and

'automatic means enclosed within a part of said tipping means adapted to cause said hydraulic tipping means repeatedly to reverse its direction of movement, at one end of its main excursion.

8. In combination with a receptacle, an hydraulic mechanism for tippingfthe same, saidy mechanism including a piston adapted to move to tip the receptacle, and automatic meanswith, in said piston for repeatedly reversing the drection of movement of the piston, while retaining it n'ear one end of its main excursion.

9. In combination in a hoisting mechanism, adapted normally to move through a given excursion, and automatic means for repeatedly reversing the direction of movement of the hoisting means at one end of its main excursion, said means including-a piston and a valve in said pisf ton, adapted to be opened automatically by movem'ent of the piston, in combination with means for closing said valve automatically upon reverse movement of the piston.

l0. In combination in an hydraulic mechanism, a cylinder, a piston therein, means for supplying fluid under pressure to one sideo! the piston to movedt. a valve in the piston, two springs positioned to act upon the valve. one normally tending to seat the valve and another tending, when compressed, to unseat the valve. the last mentioned spring being compressed as the piston is moved by fluid pressure within the cylinder.

11. In combination in a hoisting mechanism. adapted normally to move through a given excursion,v and automatic means for repeatedly reversing the direction of movement oi.' the hoisting means at one end of its main excursion, said means including a piston and a valve in said piston, adapted to be opened automatically by movement of the piston, in combination with means for closing said valve automatically upon reverse movement of the piston,` said closing means including a spring and means tor compressing it in response to movement of the piston in the raising direction.

12. In 'combination in a hoisting mechanism, adapted normally to move through a given excursion, and automatic means for repeatedly reversing the direction of movement of the hoisting means at one end of its main excursion, said means including a piston and a valve in said piston. adapted to vbe opened automatically by movement of the piston, in combination with means for closing said valve automatically upon reverse movement of the piston, said valve including a seat and two closing members movable with respect to each other, and each movable with'res'pect to the seat.

13. In combination in a hoisting mechanism. adapted normally to move'through a given excursion. and automatic means for repeatedly reversing the direction of movement of the hoisting means at one end of its main excursion, said means including a piston and a valve in said piston, adapted to be opened automatically by movement of the piston, in combination with means for closing said valve automatically upon reverse movement o! the piston, said valve inadapted normally to move through a given excursion, and automatic means for repeatedly reversing the direction of movement of the hoisting means at one end o! its main excursion, said means including a piston and a valve in said piston, adapted' to be opened automatically by -movement of the piston,. in combination with means i'or closing said valve automatically upon reverse movement of the piston, the valve in said piston comprising a valve assembly ot two re1-v atively movable valve closing members, means for opening one in direct response to movement of the piston and yielding means for opening the other in response to movement of the piston.

15. In combination in a hoisting mechanism. adapted normally to move through a given excursion. and automatic means for repeatedly reversing the direction of movement of the hoisting'means at one end of its main excursion, said means including a piston and a valve in said piston, adapted to be opened automatically by movement of the piston, in combination with means for closing said valve automatically upon reverse movement of the piston, the valve in said piston comprising a valve assembly of two re1- atively movable valve closing members, means for opening one in direct response to movement of the piston and yielding means for opening the other in response to movement of the piston, said yielding means comprising a spring effective upon one of the valve members and adapted to be compressed by movement or the piston and when so compressed to move the valve member upon which it is effective to open it.

WILLIAM C. ANTHONY. LESTER WACHTER.

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