US2244729A - Grader - Google Patents

Description

JuneIO, 1941. l. B. SAMMIS HAL GRADER 4 I INVENTORS L.B.5amm/s A ORNEY' 3 Sheets-Sheet 2 une 10, 1941. L B. 5mm Em 2,244 729 ,GRADER s Sheets-Sheet 3 Filed Nov. 21', .1938

INVENTORS n T m i 0 A 5 aR LF.

Patented June 10, 1941 GRADER Louis B. Sammis and Frank R. Hood, Wallace,

Calif Application November 21, 1938, Serial No. 241,562

3 Claims. (Cl. 209-98) This invention relates in general to a mechanical grader for the segregation of objects accord ing to size; the invention being directed specifically to a size grader having a moving grading conveyor arranged to grade fruits and vegetables, and particularly olives.

In the olive packing industry at the present time, the olives are graded according to size by apparatus of varying types but preferably by means of the endless cable type of grader shown in our United States Letters Patent No. 1,534,663.

While the grader shown in the above mentioned patent has proven quite successful and has been accorded wide commercial acceptance, its capacity is inherently somewhat limited, and it is therefore our principal object to provide an improved grader of relatively great capacity which will operate to assort objects, such as olives, which are oblong, and thus difficult to grade mechanically, with greater speed and ac- Y curacy than was previously accomplished.

It is also on object of our invention to provide, in a grader, an improved form of endless grading conveyor; the same being shown and described in three embodiments.

Another object of the inventionis the provision of a grader which is constructed so that when in operation, the objects being graded are not chafed, bruised, out or otherwise injured.

A further object of the invention is to produce a Figure 1 is a foreshortened side elevation of the apparatus; the rear side of the same being partially broken away to illustrate the grading conveyor.

Figure 2 is a fragmentary top plan view illustrating the transverse grader bars as disposed in the successively changed positions.

Figure 3 is a fragmentary side view of the grading conveyor adjacent the receiving end thereof.

Figure 4 is a similar view of the grading conveyor adjacent its other or discharge end.

Figure 5 is a fragmentary cross section on line 55 of Fig. 3.

Referring now more particularly to the characters of reference on the drawings, the grader 4 comprises a frame including transversely spaced base beams l suitably secured together and each provided with vertical frame members 2. These members 2 support a pair of transversely'spaced tracks 3 which are of substantial length as shown. These tracks are horizontal for a major portion of their length but at one end slope downward as at 4. The downwardly sloping portions 4 of the tracks are surrounded by an open topped hopper 5 whose bottom 6 extends, at its upper edge, to a termination beneath the horizontal portions of the tracks a short distance inward from their ends and as shown at I. As is obvious, the hopper extends beneath the sloping portion of the tracks and at the bottom is provided with a lateral discharge trough 8.

Side plates 9 extend the full length of horizontal tracks 3, and are included below said tracks as part of a number of receiving bins 10 arranged in a row and disposed beneath said tracks. The partitions ll between adjacent bins I!) are adjustably mounted so as to provide means to selectively control the size or grade of the objects being discharged into any particular bin. A lateral discharge trough l2 leads fromthe bottom of each bin. Also, at the end of the apparatus which comprises the discharge end of the grading conveyor as will hereinafter appear, there is a longitudinally extending chute 13 arranged to receive objects hitherto remaining on and now falling from the adjacent end of the grading conveyor.

The grading conveyor is an endless unit which is supported in its travel by. means of track portions 3 and 4, and intermediate the ends of the tracks 3 it is carried in inwardly opening chan-- nels I4 which are transversely spaced at least the same distance as the tracks and follow the contour shown in Fig. 1. At one end portion, the channel, as shown at Fig. 5, may be formed in connection with tracks 4 and extends to the top thereof.

This endless grading conveyor is constructed as follows:

'A plurality of transversely extending grading bars E5, of right angle triangular shape in cross section, and preferably of skeleton or angle-bar form, are disposed in predetermined longitudinally spaced relation, and when in operative position on the tracks, the apex of each of said bars is disposed generally in an upward position. These bars are provided at each end under and near the apices with stub shafts Hi; the shafts each being connected with'the adjacent shafts by means of offset links I? which are freely turnable on the shafts with which they cooperate. The shafts I6, outwardly of the links, carry supporting rollers l8 which are likewise free on the shafts and ride on the supporting tracks 3 and 4 as well as in channels I. The assembly described above provides the endless grading conveyor which is driven at one end by means of spaced sprockets l9 supported on a cross shaft 20; the sprocket teeth engaging between the rollers l8 as they leave the ends of the horizontal tracks. Shaft 20 is driven by any suitable means such as a belt drive shown genorally at 2| and including a motor unit 22.

Stub shafts I6 project a short distance beyond the supporting rollers l8, and at their outer ends are rigid with relatively short radial arms 23 which extend at right angles to the central apical plane of the angle bars and project in the same direction as the direction of movement of the conveyor. These arms carry rollers 24 on their outer ends and such rollers are mounted for rotation on an axis parallel to the axis of shafts l6. Other tracks 251are disposed parallel in a transverse plane with but outwardly of tracks 3, and said tracks=25 slope upward from the receiving end of'the conveyorto the discharge end; the rollers 24 riding. on tracks 25.

Operation As the endless grading conveyor is driven, the grading bars enter the feed hopper in such relative position that their adjacent lower edges, indicated at A and B, are disposed as close togather as possible; the bars being held in such position by reason of the fact that rollers M are retained within the confines of channels Hi. The space or slot C between the bars when so disposed is predetermined and of'suficient width to permit' the culls, small debris such as stones, etc., to pass therebetween; the remainder of the objects-such as marketable olivesbeing held in the trough formed by the inwardly converging faces of the bars. As the grading conveyor passes from sloping tracks 4 onto horizontal tracks 3, the rollers 24 escape from the adjacent open end ofchannel and immediately ride onto the low end of tracks 25. With continued movement of the conveyor, rollers 24 gradually ride up tracks 25 and with such movement, arms 23 rotate shafts IS in a direction which causes the adjacent bar edges in the bottom of each trough to separat and thus increase the width of the slot C therebetween. As the width ofthe slot increases, the objects being conveyed will drop therethrough when the slot is of a width to permit their escape. Those objects which are too large to escape at any time are discharged into chute 13;

In the manner above described, the-objects are effectively and rapidly graded; the several grades being received in the bins l0, except the large grade discharged onto the chute as above described. As the relative movement between the grading bars is relatively slow and easy, the objects being graded are not chafed or bruised; yet such relative movement is effective to roll oblong objects such as olives, and to thus assure their escape at the proper time.

The rolling about of the olives, which causes them to assume proper positions in the troughs for discharge according to the correct size, is caused by the fact that as adjacent bars alter their relative setting due to the control rollers 24 moving up the sloping tracks, one side of the trough included between said bars moves down while the opposite side moves up.

As the conveyor reaches the discharge end, the rollers 24 have reached their highest point and thereafter must be returned to the initial neutral or starting position, so as to return the grading bars to a similar position. This is accomplished by means of an eccentric flange 23 which is formed as an extension of the adjacent end of channel It, and against which rollers 24 ride as they leave the tracks 3; the eccentricity of said flange moving the rollers inward until in proper position to enter the parallel sided channels M.

The use of channels to guide the conveyor between the ends of the operative portion thereof not only enables the control rollers to be returned to and maintained in the desired neutral position, but avoids the need of using various direction changing pulleys in the length of the conveyor.

By reason of the grading bar arrangement shown and described, a more compact grader having a greater capacity than one of the cable type may be provided, since there is no, relative restriction at the feed-in end as is necessary with the cable grader.

From the foregoing description it will be readily seen that we have produced such a device as substantially fulfills the objects of the invention as set forth herein.

While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claims.

Having thus described our invention, what we claim as new and useful and desire to secure by Letters Patent is: V

1. In a grader, an endless grading conveyor including grading elements formed of a plurality of cooperating sections of rigid angle form disposed transversely in spaced relation, the apex of the sections extending upwardly; a stub shaft rigid with and projecting from each end of the sections under and adjacent its apex, a roller mounted on each shaft, the grader including transversely spaced tracks upon which said rollersride, a drive for the conveyor, and means operative when the conveyor is driven and acting on said shafts whereby to effect relative rotation of said sections.

2. A grader comprising an endless driven conveyor having a feed end and a produce receiving run, and which includes a plurality of transversely extending evenly spaced and unitary grading elements each having a pair of upper faces rigid with each other and diverging downwardly from an axis and disposed symmetrical to a line at right angles to the length of the conveyor when said elements are at the feed end of said conveyor whereby the spaces between the lower edges of adjacent faces of arjacent elements will then all be the same width, means mounting the elements for rotation, a track extending lengthwise of said run of the conveyor andmeans connected to the grading elements and engaging the track; the latter being disposed so that with the movement of the conveyor, the elements will be rotated through a predetermined arc whereby one of the upper faces of the elements will move up toward a horizontal position while the other face will move down toward a vertical position and the spacing between the adjacent faces of adjacent lengthwise thereof, rollers on the arms at their elements will be increased. outer end and tracks on which said rollers ride 3. A structure as in claim 1, in which the cenextending lengthwise of the grading run of the veyor includes side supporting chains in which the conveyor chains at an angle thereto.

stub shafts are turnable and in which said means 5 comprises arms fixed on and projecting from the LOUIS B. SAMMIS.

shafts laterally out from the chains in a direction FRANK R. HOOD.

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