Патент USA US2136890код для вставки
NOV- 15, 1938. ‘ 2,136,890 J. M. ROBERTS EXCAVATING BUCKET’ Filed Dec. 13, 1957 2 Sheets-Sheet l INVENTOR. .Jn I ["LRub rts BY A TTORNEYS. Nov. 15, 1938. J. M. ROBERTS 2,136,890 ‘EXCAVATING BUCKET Filed Dec. 15, 1957 2 Sheets-Sheet 2 INVENTOR. JD 21 M_. Roberts v ' ' 5””, /// '?; TORN S 2,136,890 Patented Nov. 15, 1938 PATENT OFFICE 2.186.890 .EXGAVATING BUCKET Joel M. Roberts,‘ Racine, Wis. Application December 13, 1937, Serial No. 179,493 4 Claims. (Cl. 37-1187); This invention appertains. to excavating de vices. andmnre particularly to grab. or clam shell buckets; ' ' ' ‘ ‘.One of the nrimary‘qbjects, of my‘ invention is to provide novel means. for constructing. and 0D. elating a. grab, bucket, whereby the. usual com plicated arrangement. of‘ heavy Operating cables and sheaves and‘ awkward bucket head is elim mated. Another salient object of my invention is to provide a grab bucket having a novel arrange ment of hydraulic operating means for opening and closing the jaws of the bucket, whereby a compact and durable structure will be had, which ing side andend. ?anges ‘I and 8. The side ‘ ?anges support the spaced parallel shafts 9 .and ID on which are mounted, for swinging movement, the bucket jaws II and I2. These jaws II and I2 can be constructed in any preferred manner and I‘ of any size tov suit the character of the work being done. The‘upper edges of the jaws H and I2’ have secured thereto lift cables I3, and thesecables are employed‘ for the sole purpose of raising and low v10 ering the bucket and do not constitute the op erating‘means for the jaws at all. The bucket also has formed or secured to the upper edges of the jaws, upstanding pairs of arms I4, the purpose of which will be hereinafter more fully 15 15 will be simple and easy to operate. A further object of my invention is to provide a set forth. The bottom wall 6 of the frame 5 has rigidly grab bucket embodying a supporting frame or platform on which is rockably mounted the secured to its central portion a bearing bracket bucket jaws, the platform also supporting the I5, and this bearing bracket has rockably se pump, operating motor, the hydraulic rams, the cured to its opposite ends, as at I6, the cylinders 20 rams being operatively connected to the jaws and ’ I‘! for the hydraulic rams I8. These cylinders for the rams have reciprocally mounted therein platform. A still further object of my invention is to the usual ram pistons, and the piston rods I9 provide novel means for operating the bucket thereof extend exteriorly of‘ the cylinders and 25 jaws, which consists in a reversible electric motor are pivotally connected to the arms I4, as at 20. 25 A rotary or like pump 2| is secured to the plat for operating a rotary pump in either direction, whereby upon reversing of the motor, the ?uid form or frame 5 adjacent the cylnders, and the under pressure can be forced to either end of the inner ends of the cylinders are connected by ram cylinders for operating the ram pistons in means of conduits 22 with one port of the pump, 30 the desired direction for opening or closing the and the outer ends of the cylinders are con nected by conduits 23 with the other port of the Jaws. pump. The pump is operated by a reversible With these and other objects in view, the in electric motor 24, and the cable for the motor ex vention consists in the novel construction, ar rangement, and formation of parts, as will be tends to the control cab of the excavating ma 35 hereinafter more speci?cally described, claimed, chine, and a switch is provided for reversing the 35 and illustrated in the accompanying drawings, motor, when necessary. By reversing the electric motor, the pump 2| in which drawings: Figure l is an end elevation of my improved can be driven in opposite directions, and, hence, grab bucket, showing the same in its closed in one instance the pump will intake fluid from the outer ends of the cylinders and force the 40 40 position. Figure 2 is a perspective view of the improved ?uid under pressure to the inner ends of the cylinders. When the pump is rotating in the grab bucket, showing the same in its open posi opposite direction, ?uid is drawn from the inner tion. ‘ ends of the cylinders and is forced under pres Figure 3 is a top plan view of the bucket, show sure into the outer ends of the cylinders. 45 45 ing the same in its closed position. In operation of my improved grab bucket, the Figure 4 is a detail sectional view taken sub stantially on the line 4-4 of Figure 2, looking in same is lowered by the cables I3, and the motor is operated for taking ?uid from the inner ends the direction of the arrows. Referring to the drawings in detail, wherein of the cylinders and forcing ?uid under pressure intothe outer ends of the cylinders. Thus, the 50 50 similar reference characters designate corre sponding parts throughout the several views, the pistons of the hydraulic rams will be moved in letter B generally indicates my improved grab wardly, which will swing the jaws on their pivot bucket, which includes a supporting frame 5. shafts III, and consequently the jaws will be This frame 5 is in the nature of a platform, and opened. After the jaws engage the material to be lifted, the electric motor is reversed, so as to 55 55 thus the same embodies a bottom wall 6, hav 2 2,136,890 drive the pump in the opposite direction, and ?uid under pressure will be pumped into the in ner ends of the cylinders and will be drawn from the outer ends of the cylinders. This will move the pistons outwardly and forcibly swing the jaws H and [2 on their pivots to a closed position. From the foregoing description, it can be seen that I have provided an exceptionally simple and durable form of grab bucket, in which the jaws 10 can be expeditiously opened and closed by hy draulic rams. ' v While I have shown, described, and claimed the pistons connected with the jaws, and the cylinders connected with the frame, it is to‘be 15 understood that this construction can be re versed, and, in some instances, I contemplate connecting the cylinders with the jaws, and the pistons with the franie. , ‘ Other changes-in details may be made with 20 out departing from the spirit or the scope'of my invention, but what I claim as new is: 1. In an excavating bucket, a supporting frame, jaws rockably mounted on the frame, lift cables for the bucket, and hydraulic rams in cluding cylinders and pistons, means pivotally connecting the cylinders to the frame, and means pivotally connecting the pistons to the jaws. 2. In an excavating bucket, a supporting frame, a pair of bucket jaws having upstanding 30 ears on their inner ends, means pivotally con necting the ears to the outer ends of the frame, upstanding arms formed on the upper front edges of the jaws, hydraulic rams including pis tons and cylinders, means pivotally connecting the cylinders to the frame, and means pivotally connecting the pistons to the arms. 3. In an excavating bucket, a supporting frame, jaws rockably mounted upon said frame, hydraulic rams including cylinders and pistons, means pivotally connecting the cylinders to the 10 frame, and means pivotally‘ connecting the pis tons to the jaws, a liquid pump, conduits con necting one of the ports of the pump with the in ner ends of the cylinders, conduits connecting the outer ends of the cylinders with the other port of 15 the pump, and means for driving the pump in opposite directions. 4. In ‘an excavating bucket, a frame, jaws rockably mounted 'upon the frame, hydraulic rams for opening and closing the jaws including cylinders and pistons, means pivotally connect ing the cylinders to the frame, and means piv ot-ally connecting the pistons to the jaws, a ro tary pump, conduits connecting the inner ends of the cylinders to one port of the pump, conduits 25 connecting the outer ends of the cylinders to the " other port of the pump, and a reversible electric motor for operating the rotary pump in either direction. ' ' JOEL M. ROBERTS. '