US1995770A - Automatic skip hoist - Google Patents

Description

March 26, M, 5 FIRST AUTOMATIC SKIP HOI ST Filed June 8, 1951 6 94/ 1 A TTORNE Patented Mar. 26, 1935 jffiioea'zvo l "-QJAUKIIOMALTIC SKIP HOIST TMalilonE.'Eirstjllakewood,"Ohio, assignoritdlhe Ohio, a corporation of Ohio 'C.'"0."Bartlettf'& Snow Gompany', Cleveland.

Application June s, 1931, Serial Nb. 542,827

2 Claims.

My invention relates to an improved automatic loading skip hoist where the loading is initiated by movement of the empty skip, and stopped by the pressure of the loaded skip. Such an apparatus, built according to my invention performs with a quietness and precision which prolongs the life of the moving parts, and through simplicity of construction effects an economy of space and of installation cost. The following description clearly discloses the means used in securing these results.

To the accomplishment of the foregoing and related ends, said invention, then, consists of the means hereinafter fully described, and particularly pointed out in the claims; the annexed drawing and the following description setting forth in detail certain means embodying the invention, such disclosed means constituting, however, but one of various mechanical forms in which the principle of the invention may be used.

In said annexed drawing:--

Fig. 1 shows the apparatus with a descending skip engaging the chute-gate; and Fig. 2 shows the same with the chute-gate held in open position.

My apparatus consists of a chute carrying an undercut gate, as described, opened by a descending skip, held open by a hook, released by the weight of the loaded skip through action of a compound lever as described, and closed by counterweights.

The skip 1 carries dogs 2 so positioned as to engage rollers 3 carried on the free end of the fiat bars 4 pivoted on the ends of the round shaft 5, about which the under-cut gate 6 rotates in opening. The bars 4 are held in position to engage the skip by studs 7 extending laterally from the face plate 8 of the gate 6. The

said gate is supported by and rotates about the round shaft 5, which is so located on the bot tom of the chute 14 that the face plate of the gate 6 covers and closes the opening of the chute. Extending backwards from the gate bearings 9 which rotate about the said shaft 5 are levers 10 on either side of the gate, which levers carry counterweights 11. The angle of these levers with respect to the gate is such that when the gate is drawn into an open position by the descending skip, a rod 12 connecting the free ends of said levers engages a hook 13 hinged to the bottom of the chute 14 at 15. t

On the upper edge of the face of the gate extending outwardly in radial relation thereto is a short plate 16 with upright sides 17, together forming a supplemental chute which extends well within the skip when the gate is open. The lower side of the gate carries a cross plate 26 so positioned that when the gate closes the cross plate encounters the free end of a leaf spring 27 aflixed to the bottom of the chute.

The hook 18 carries a short lever 18 projecting therefrom and lying in the plane of the hooks rotation, which lever at its free end is pivotally connected to a rod 19, adjustable as to length. The other end of rod 19 is connected by an integral link with an arm 20 of a compound lever, the other member of which is the lever 21. The lever 21 has sliding connection with the lever 20 by means of the pin affixed to the end of the lever 21 operating in a slot provided therefor in lever 20. On the free end of said arm 20 is an adjustable counterweight 22, which normally rests on the block 23. The free end 24 of the other arm of said compound lever is so positioned that a stud 25 carried on the skip will be engaged by y it when the skip is lowered to receive a load.

In operation the skip is lowered and the dogs 2 engage the rollers 3, pressing the bars 4 against the studs 7 and carry the gate 6 downward into the open position. In this position the rod 12 connecting the levers 11 engages the hook 13, which holds the gate in an open position while the skip disengages the rollers 3 and comes to rest with the stud 25 resting upon the free end 24 of the compound lever. Material from the opened chute fills the skip until, a predetermined weight being therein, it moves the end 24 of the lever downward against the counterweight 22 and, through the lever and rod 19, lifts the hook 13, disengaging the rod 12 and permitting the counterweights 11 to close the gate. As it closes, the cross-member 26 encounters the free end of the leaf spring 27 which absorbs the jar of the closing gate without oscillations. As the loaded skip is raised the dogs 2 encounter the rollers 3 but they lift their carrying bars about their pivoted connections on the ends of the shaft 5 and permit the skip to pass without disturbing the gate 6.

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means stated by any of the following claims or the equivalent of such stated means be employed.

I therefore particularly point out and distinctly claim as my invention:-

1. In apparatus of the character described, the combination of a skip bucket adapted to be moved substantially vertically on a fixed line of travel;

a material discharge chute adjacent the line of travel of said bucket; a pivotally supported under-cut gate adapted to be moved to and from a position closing the discharge end of said chute; a counterweighted structure mounted on said gate and adapted when free to move it to position closing said chute; a hook rotatably mounted on a fixed pivot on a stationary element, and adapted to engage and hold said structure when said gate is moved from the position closing said chute; means disposed in the line of travel of said bucket whereby said bucket as it descends engages said means and forces said gate away from the position closing said chute; and means adapted to move said hook out of engagement with said structure, said last-named means being operable by the weight of said bucket when loaded.

2. In apparatus 01 the character described, the combination of a skip bucket, a material discharge chute; an under-cut gate adapted to close and open the discharge end of said chute; a counterweighted structure adapted when free to move said gate to close said chute; a hook rotatably mounted on a fixed pivot on a stationary element and adapted to engage and hold said structure when said gate is moved to open said chute; means disposed in the line of travel of said bucket whereby said bucket as it descends engages said means and moves said gate to open said chute; and means adapted to move said hook out of engagement with said structure, said last-named means being operable by the weight of said bucket when loaded.

MAHLON E. FIRST.

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