US1726770A - Mechanism for operating excavator shovels - Google Patents

Description

Sept. 3, 1929.. v G. T. RON K 1,726,770

MECHANISM FOR OPERATING EXGAVA'I'OR SHOVELS I Filed Dec.v14, 1926 I/ld 42 1; g V L 22 12 11 10 [.194 1 12 Patented Sept. 3, 1929.

UNITED STATES' PATENT OFFICE.

GEORGE T RONK, OF FAIRFIELD, IOWA, ASSIGNOR T SPEEDER MACHINERY COR- PORATION, 0F CEDAR RAPIDS, IOWA, A CORPORATION OF IOWA.

MECHANISM FOR OPERATING EXCAVATOR SHOVELS.

Application filed December 14, 1926. Serial No. 154,757.

The object of my invention 'is to provide a simple, durable and inexpensive mechanism for controlling and operating the shovel of an excavator.

More specifically it is the object of my invention to provide a simple mechanism for moving what is commonly known as dipper sticks longitudinally through its support, the mechanism for operating said dipper stick being mounted on the excavator platform rather than on the boom to which the stick support is mounted.

A furtheriobject is to provide an operating and controlling mechanism for dipper sticks in which no gearing is carried by the boom other than cables and their supporting sheaves, and in which .a single cable drum is employed for handling the cables.

My invention consists in the construction, arrangement and combination of the various parts of the device, whereby the ob- 'jccts contemplated are attained, as hereinafter more fully set forth, pointed out in my claim, and illustrated in tlie accompanying drawings, in which:

Figure 1 is a side elevation of an excavator showing the manner in which my improved mechanism is applied thereto.

Figure 2 is an enlarged, detail, and elevation of the cable controlling mechanism, one of the brake drums being shown in section.

Figure 3 is a plan view of the cable controlling mechanism, a portion of which is shown in section.

Figure 4 is an enlarged, detail, sectional view taken on the line 4-4 of Figure 1.

The numeral 10 indicates the supporting frame of an excavator having a platform or 40 turn table 11 mounted thereon. The said platform 11 is provided with an upwardly and forwardly extending boom 12, the upper end of which is provided with a pulley 13. The upper edge of the boom is provided with a bearing member 14 located midway between its ends, said bearing member having pivotally mounted therein a guide 15 designed to slidably receive a dipper stick 16 having at ts outer end a shovel or dipper 17. The stick 16 is preferably formed of two spaced members slidably mounted in the member 15. The guide 15 is pivotally mounted in the hearing 14 by means of a shaft 18. The said shaft 18 carries a double grooved sheave 19 mounted between the members 16.

Supported'on the platform 11 is a frame 20 in which is rotatively mounted a shaft 21 provided with a cable drum 22 rotatively mounted thereon. Said drum 22 has a brake drum 23 formed integral therewith. Said drum 23 is provided with a brake band 24 of the ordinary construction, said band being controlled by means of a lever 25 pivotally mounted on the frame 21;

The inner face of the brake drum 23 is provided with an internal gear 26, while the shaft 21 is provided with a pinion gear 27 rigidly secured thereto. Rotatively mounted on the shaft 21 adjacent to the pinion 27 is a hub 28 designed to carry a disk 29 which carries a brake drum 30 near its outer edge. Said drum 30 is provided with a brake band 31 controlled by a lever 32. The disk 29 is provided with an inwardly extending lug 33 which supports a stub shaft-34 carrying a planetary gear 35 in mesh with both the pinion 27 and the internal gear 26.

The inner face of the drum 30 is provided with an expanding brake band 36, one end of which is pivotally connected to an arm 37 rigidly secured to the shaft 21. The arm 37 is provided with a pivoted lever 38, one end of which is pivotally connected to the other end of the brake band 36, the lever being supported in an inclined radial manner so it may be engaged by a cone shaped collar 39 slidably mounted on the shaft 21, and when so engaged will cause the band 36 to be forced into engagement with the inner surface of the drum 30,

and to cause the said drum and the shaft 21 to rotate in unison. A spring 40 is provided for releasing the bands from the drum 30 when the collar 39 is moved out of engagement with the lever 38. A yoke 41 is provided for operating said collar, one end of the yoke being pivotally mounted to the frame 20, while the other end is provided with a short link 42 connected to one end of a bell crank lever 43. The other end of the bell crank lever 43 has a link 44 pivotally connected to the lower end of the lever 32. The said parts are so arranged that when the band 31 is caused to engage the drum 30, the lower end of the lever 32 will be moved inwardly :causing the collar 39 to be moved outwardly and out of engage ment with the lever 38, permitting the band 36 to be released. If the band 31 is released, then the band 36 will be brought top of the sheave 19 and secured to the outer end of the dipper stick 16, while the other end of the cable engages the under surface of the sheave 19 and is attached to the inner end of the dipper stick.

By this arrangement it will be seen that if the drum 22 is rotated in one direction, then the dipper stick will be moved inwardly, but if it is rotated in the opposite directlon, then the dipper stick will be moved outwardly. This reverse motion is imparted to the drum 22 through the gearing mechanism above described, and controlled through the movement of the lever 32. The lever 25 and the band 24 are simply for braking purposes. If the upper end of the lever 32 is moved outwardly, then the band 31 will be moved to engage the drum 30, and at the same time the band 36 will be released in the manner before described. This will cause the drum to be held against rotation.

It will be seen that if rotation is imparted to the shaft 21, movement will be imparted to the drum '22 through the internal gear 26 and the intermediate gear 35, the drum r0tating 1111 311 opposite direction from the shaft 21, and at a considerably reduced speed, thus providing means for drawing the dipper stick outwardly while the shovel 17 is loaded. If the upper end of the lever 32 is returned to its normal position, in which both bands are substantially free from their respective drums, then the weight of the dlpper stick may at certain times cause the drum 22 to rotate, the speed of which may be controlled by the band 24 and the lever 25. By moving the upper end of the lever 32 inwardly, the

' band 31 will be released and the band 36 caused to engage the drum 30, which will then cause the said drum 30 and the arm 37 and the shaft 21 to rotate in' unison, the pinion 37 also being rotated. This in turn will cause the drum 22 to be moved in unison therewith, inasmuch as there is no relative movement between the gears and 27. The drum 22 will be rotated at a higher speed than when the lever 32 is moved outwardly, which in turn will cause the dipper stick 16 to be moved inwardly at a considerably higher speed than the speed at which it is moved outwardly, at which time the shovel is usually empty. This provides means whereby the shovel may be easily and quickly moved to its various positions of movement, and at the same time support the weight of the cable controlling mechanism upon the platform instead of on. the boom as is the usual practice. A cable 47 is provided for elevating and lowering the shovel which is controlled by means of a drum 48 of the usual construction.

Thus it will be seen that I have provided a mechanism for controlling the dipper stick of an excavator, which is of simple, durable and inexpensive construction, in which the main supporting vweight of the cable actuating mechanism is carried directly by the platform, and in which the mechanism for controlling the same is very simple and accurate in its operation. The cable and the dipper stick may be easily and quickly removed if so desired, and the drum 22 utilized to operate an inhaul cable.

I claim as my invention:

In a device of the class described, a shaft therein, a cable drum rotatively mounted on said shaft, an internal gear formed integral with said drum, a pinion gear secured to said shaft, a web having internal and external brake drum surfaces, a planetary gear carried by said web in operative relation with said pinion and said internal gear, an arm secured to said shaft, an expandible brake .band having one end pivoted to said arm, a lever pivoted to said arm having one end connected to said brake band and its opposite end projecting inwardly toward said shaft, a cone slidably mounted on said shaft and designed to engage and actuate said arm for expandlng the brake band connected thereto, a brake band for the external surface of said brake drum, and means for operatively connecting said cone and the last said brake band.

GEORGE T. RONK.

Images