US1756166A - Auxiliary boom for excavators - Google Patents

Description

April 29, 1930.

G. w. ACUFF, JR

AUXILIARY BOOM FOR EXCAVATORS Filed Feb. '7, 1929 s Sheets-Sheet 1 fn ve n to r 6607 W14 A ril 29, 1930. W. AcuFF; JR 1,756,166

AUXILIARY BOOM FOR EXCAVATORS Filed Feb. 7, 1929 3 Sheets-Sheet 2 1 2 t 1' WAJ 25 v ln wmto' r Attormgy AUXILIARY BOOM FOR EXCAVATORS Filed Feb. 7, 1929 3 Sheets-Sheet 3 I32 I Q Invent-0 1" 6M %c fi Attarnqy Patented Apr. i 29, 1930 NITED ST TES PATENT oF icE GEORGE w. noun, JR. or sun. tours, mrssounx AUXILIARY 3001i]: FORLEXGAVATORS 1 Application filed February 7, 1929. semi No. 338,225.

' The presentinvention relates to improvements in excavators and has reference more particularly to an auxiliary boom for association with the conventional shovel boom of the machine.

One of the important objects of the present invention is to provide an auxiliary boom attachment that will increase the output of the excavator especially where the excavator is used on high lift work and where digging at the bottom ismadevery 'difiicult especially if the earth is hard. y 6

One of the important objects of the present invention is to provide an auxiliary. boom that is pivotally associated with the main shovel boom whereby said auxiliary boom may be utilized as an extension for the main boom whenever necessary, means being pro- 'vided for normally holding the auxiliary 2 boom in a substantially horizontal position. Another important object of the" invention is to provide an auxiliary boom attachment that can be readily and easily installed without necessitating material alterations of the shovel boom of the e'xcavator,-said auxiliaryboom being at all times positive and eflicient in its operation.

Still a further object is to provide an auxiliary boom associated with the main shovel boom, the parts being disclosed in their normal positions.

Figure 2 is ,a view similar to Figure 1, showing the position ofthe auxiliary boom after the dipper'has been raised. I

Figure 3 is a similar side elevation showing ter which is simple in construction, inexpenw the dipper inits initial position for digging into the earth; 6

Figure 4 is a top plan view of the auxiliary boom per se. v

Figure 5 is a side elevation thereof, and

. Figure 6 is a transverse section taken approximately on the line 6S of Figure 5.

,In the drawings, wherein-for the purpose ofillustration is shown the preferred embodiment of my invention, the numeral 1 designates generally an excavating machine of.

cluding the wheeled body 2 on which is assembled the conventional hoisting mecha nism arranged within the housing 3.

The shovel'boom 4 which is also of the conventional construction is pivoted at its lower end as at 5,,on the body 2, for vertical swinging movement and this shovel boom carries the swinging and sliding dipper stick 6 that carries at its outer end the conventional dipper or bucket 7. As the mechanism for effecting the sliding movement of the dipper unit forms no important part of the present invention, a detailed description thereof is believed unnecessary.

The outer or upper endsof the spaced arms of the main shovel boom 4 are formed with spaced registering openings 8, while. mounted between the extremities of these spaced arms is the sheave 9.

The auxiliary boom constituting my invention is denoted generally by. the numeral 10 and the same includes a pair of channelshaped bars 11 and 12 respectivelythat are formed at their inner end portions with the any conventional construction, the same inspaced registering, openings 13.- A sheave supportingshaft 14 between the outer ends of the bars 11 and 12 and as is more clearly disclosed in Figure 4, 6 suitable sheaves 15 are arranged on this shaft 14. Y

The inner ends of the channel shaped bars of the auxiliary boom 10 are disposed on opposite sides of the outer end portions of the main boom 4 and a pivot forming rod 16 extends through predetermined registering openings 8 and 13 whereby the inner end of the.auxi liary boom is pivotally mounted on the upper end portion'of the main boom. The hoisting cables are shown at 17 and the same extend over the sheaves 9'and 15 and are operatively connected to the dipper or bucket 7, through the medium of the sheave 18.

The hoisting cables 17 are controlled by the 11 and 12, for cooperation with the respective chains 20 that are attached at their ends to the outer end portions of the respective arms of the main boom '4 as at 21. This provides a means for limiting the downward swinging movement of the auxiliary boomlO, and normally maintains the auxiliary boom in a horizontal position as shown very clearly in Figures l and 3 of the-drawings.

Depending brackets 22 are carried by the 7 bottom faces of the intermediate portions of and when the proper mechanism is actuated.

the bars or arms of the auxiliary boom, and a transverse. shaft 23 extends through these alignedbrackets as suggested in Figure 6.

Suitable rollers 24 are arranged on the shaft 23, adjacent the inner faces of the respective brackets as also clearly indicated in Figure 6. These rollers 24 are adapted to cooperate with the dipper stick 6 in the manner to be presently described.

When the axuiliary boom 10 ispositioned in the manner as shown in Figure 3, the dipper 7 is in position for digging into the earth the dipper stick 6 will be operated to effect the swinging movement of the dipper stick to the position shown in Figure 1 and a further operation of the proper mechanism will cause the sliding and swinging movement of the dipper unit. The hoisting cables 17 when actuated will elevate the dipper 7 and when the dipper stick 6 engages with the rollers 24, the auxiliary boom will then be raised with the dipper 6. Vhen the dipper is at its maximum height, the auxiliary boom will be positioned'in alignment with the main'boom 4 as suggested in Figure2.

As the dipper is lowered, the auxiliary boom will also lower itself until it is again ina horizontal plane and the chains 20 will limit the downward swinging movement. of the auxiliary boom. 5

This arrangement provides a means whereby an excavating machine that is used in high lift 'work will perform its operation efliciently and to a maximum degree in such a manner as to overcome the difliculties in digging 'in bottomespecially where the dirt is 4 and to this end the auxiliary boom is brought to the position shown in Figure 2, whereby the bars 11 and ,12 are brought into alignment with the respective arms of the main boom and then an additional pin 25 ex-' tends through one pair of registering openings 13 in the bars and theupperm'ost pair 7 terial alterations and the device will at all times be positive and eflicient in carrying out the purpose for which it is designed. While I have shown the preferred embodiment of my invention, it is to be understood that various changes in the size, shape and arrangement of parts may be resorted to,

without departing from the spirit of the iny vention or the scope of the appended claims.

What I claim as new is 1. In an excavator, in combination with a main boom, a dipper stick operatively associated with said main boom, a dipper carried by the outer end of said dipper stick, a hoist cable attached to the dipper to lift the same, an auxiliary boom attached at its inner end on the upper end of the main boom for vertical swinging movement, means for adjustably mounting said auxiliary boom on the upper end of said main boom, a' sheave carried by the outer end of the auxiliary boom over which the hoist cable is trained, said auxiliary boom comprising a pair of bars arranged at their inner ends on opposite sides of the upper end portions of said main boom, the inner ends of the bars being formed with pairs of spaced registeringiopenings, a pivot pin extending through one pair of registering openings in the inner ends of the bars and through the outer end portion of the main boom for pivotally securing said bars to said main boom for vertical swinging movement of the bars, chains secured to the upper end of said main boom and to said bars for limiting the downward swinging movement of said bars, whereby said bars may be swung to a substantially horizontal position,

asecond pin extending through another pair of registering openings in the bars and through the main boom at a point outwardly of the first mentioned pin for securing the bars of said auxiliary boom in alignment with the main boom to provide an extension therefor, brackets mounted on the bars of said auxiliary boom to extend outwardly and downwardly therefrom, a transverse shaft rotatably supported in said brackets, rollers mount-ed on said shaft; and the dipper stick of said main boom adapted to engage said rollers during the upward movement of said 7 stick for swinging the bars of said auxiliary boom to a position substantially in alignment with the main boom, and the free end of the bars of said auxiliary boom extending beyond the adjacent end of said main boom when said arms have been swung to the last named position. v

2. In an excavator, in combination with a main boom, a dipper stick operatively associated with said main boom, a dipper carried by the outer end of said dipper stick, a hoist cable attached to' the dipper to lift the same, an auxiliary boom attached at its inner end on the upper end of the main boom for vertical swinging movement, a sheave carried by the outer end of the auxiliary boom over which the hoist cable is trained, spaced transversely aligned brackets on said auxiliary 1o boom extending outwardly and downwardly therefrom, a transverse shaft rotatably supported in said bracket, rollers mounted on said shaft, andv the dipper stick of said main boom adapted to engage said rollers during the upward movement of said stick for swinging said auxiliary boom to a position substantially in alignment with the main boom, and thefree end of said auxiliary boom extending beyond the adjacent end of said main boom when said auxiliary boom has been swung to the last named position.

In testimony whereof I aflix my signature.

I GEORGE W. ACUFF, JR.

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