US1876316A - Jigger conveyer - Google Patents

Description

E. RlDGlLL JIGGER CONVEYER Sept. 6, 1932'.

Filed March 28, 1931 3 Sheets-Sheet sept. 6, `193,2.

l E. RlDGlLL i JIGGER coNvEYER l Filed March 284, 1931 5 Sheets-Sheet 2 Hf Q /V YEA/TOR.

E. RIDGILL Sept. 6, 1932.

JIGGER CONVEYER Filed March 28, 1931 5 Sheets-Sheet 3 Patented Sept. 6, 1932 Price-1,*4

ERNEsTRIDGrLL, or SHEFFI'ELD, ENGLAND amena, CONVEYER rlhis invention is lfor improvementsin 'or relating to Jigger conveyers and more particularly to mechanism arranged to impart relciprocatory movement to thetroughs of such Econveyers. y V

Mechanisms of this character usually comprise a crank arranged to be rotated at'a uniform speed and which is coupledto'the trough of the conveyer by a -connecting'rod or link CTi0 mechanism which modify f the rectilinear movements of the trough inboth' the forward and backward strokes thereof-fromthe simple harmonic motion derived from uniform rorational movement ofthe crank so'as toeffect the trough at the end of the forwardfstroke than at the end of therearward'stroker rIlhis motion of the trough of the conveyer produces the conveying action.y n f y The present -invention 4provides a mechanism which imparts reciprocatory motion to the troughs of jigger conveyerslwhich produces an improvedconveying action as compared with that above described'andfzwhils't the reversal of motion imparted tothe Vtrough of the mechanism at each forward end ofthe stroke thereof, is relatively. much'more rapid than the reversal of motion atthe end of each n return stroke thereof, the motion of the 3@ trough during the return stroke conforms substantially to simple rectilinear movement'derived from uniform rotational movement, that is to say, to simple harmonic motion.

It is found that motion imparted in accordance with this invention-to the trough 'of a jigger conveyer during the return -stroke thereof, whilst the material'in lthe trough is 'Figure 4,

l15 a. relatively more rapid reversal of motion of 1 pivotforming the trunnions 13of the doublew armedlever 11, 12. vThe arm 12 of the double :ings 24 provided inthe casing 1. i

the driving mechanism 4.l

. Application med March 28,1931', Seria; No. 526,064, aaa in Great Britain :nine 24, 1930.

-withthe coverplate of the mechanism illustrated in Figure 1 removed.

Figure 3 is a sectional end view on the line 3 3 of Figure 2,

Figure 4 is a planview'of a portion of a modified formfof mechanism to that illus trated in Figure 2,

Figure 5 is a section on the line 5-5-ef Figure 6 is a section kon the line'G-G ofggc -Figure4, and g `'Figures 7 and 8 are graphs illustrating thev rectilinear motion produced bythe mechanisms illustrated in F'igures'l to 6j Referring to yFigures 1 to 3, a casing 1 pre-@Q5 vided with a cover plate 2 is mounted upon skid .members 3 in the" mannerpdescribed in fthe specifcationofpatent application Nc. 28627 of 1930. -A driving mechanism 4, in-

dicated in Figure'2 in outline only,'isbolted 70 to the casing 1 and is arranged to rotate a crank shaft 5 mounted in bearings 6v and?" :provided-in the casing 1 at a uniform speed.

The crank pin 8 of the crank shaft 5 is con-.

nected byy a connecting rod-9 to a pin 10 car 75 'riyedd by one arm 11 ofthe bifurcated" double armed lever 11, 12 which is rotatably mounted on trunnions 13 in bearings '13a carried by the casing 1. The connecting rod '91s provided with a cut-away portion 14,*F1'gure`1,

s0 to vpermit the parts ofthe mechanismv to as- Y sume the position indicated in vFigure 1, in lwhich position the cutaway portion 14 isfarranged to clear the central portion ofr the armed lever is provided with a pin 15 which is connected by a connecting rod-16 to a pin 17 Amounted upon a slide fblock 18." The slide block 18 is mounted in guides' y19 so as to bef90 slidable in a longitudinal'direction. A pin 20, mounted on the slide block 18, is :con-

nected by a link 21 toa crankl pin 22 provided upon a crank shaft 28 mounted'in bearn 95 The crank shaft 23 is arranged to extend 'beyond one side of the casing 1 and'is lmounted at its freev end in a bearing 25 which is secured to one of the skid members 3 and to 100 A pair of bifurcated arms 26, 27 are keyed to the crank shaft 23 between the casing l in the bearing 25 in the manner indicated in Figures l and 2. The free ends of the arms 26, 27 are each provided with two holes 28, 29 arranged in radial alignment along the arms. Apin 30 is located in the holes 29 of each of the arms 26, 27 so as to connect a link 3l to each of the said arms. The other end 'of l each of the links 3l is provided with a horizontally disposed rectangular hole through which a bar 32, rectangular in cross-section, is arranged to extend, the said bar being locked to the links 3l by means of bolts 33. The bar 32 extends beyond the link 3l which is connected to the arm 27 and is connected by a pin 34 to'one end of a connecting rod 35, the other end of which is arranged to be connected by a pin 36 to the side of a trough of a jigger conveyer, not shown.

It is to be observed that the bar 32 maybe arranged to extend upon the opposite side of the links 31, if required, to that illustrated in the drawings so that a conveyer trough may be driven from the opposite side of the mechanism. Further it will be appreciated that the pins 30 may be arranged to connect the links 31 to the arms 26, 27 by engagement with the holes 28 in lieu. of the holes 29, thus affecting a slightly shorter stroke of the conveyer trough.

ln the modilication of the apparatus illustrated in Figures 4 to 6, the arms 27 on the shaft 23 are connected by a link 3l an-d pin 37 to a swivel connection comprising two articulated members 38, 39 connected together by means of a pin 40. rThe member 39 is connected by means of a pin 4l to one end 42 of a horizontally disposed double armed lever 42, 43. The lever 42, 43 is pivotally mounted upon a pin 44 provided with a shoulder 45 (Figures 2 and 6) from which two pegs 46 extend in a downward direction and are arranged to be located in corresponding holes 47 formed in one of the skid members 3. The lever 42, 43 is maintained in place upon the pin 44 by a U-shaped strap 48 secured to the skid member 3 by bolts 49.

.The strap 48 also maintains the pin 44 in position. The arm 43 of the lever 42, 43.is connected by a pin 50 to one end of a link 5l, the. other end of, which is connected by a pin 52 to a connecting rod 53. The connecting rod 53 is arranged to be coupled to the underside of a conveyer trough (not shown) .by means of a pin 54.

This arrangement permits the trough to be Vdriven from the centre thereof and is insome cases preferable to the arrangement of the drive at the side of the trough as disclosed in Figures l to 3. Y

If it is required to drive a trough upon the opposite side of a mechanism to that effected with the arrangement of the mechanism shown in Figures 4 to 6,\the pin 44 is secured to the opposite side of the skid member 3 where a second set of holes 55 to receive the bolts 49 and a pair of holes 56 to receive. the pegs 46 are provided. The relative positions of the link 3l and members 36, 39 and 'the link 5l and connecting rod 53 are reversed so thatfthe link 31 is connected to the arm on the shaft 23.., l n

In all the constructions illustrated in the drawings, anchor plates 57 are provided on the lskid members-3 to enable the lower end of pit props to be located therein for the purpose of securing the mechanism on the iioorof a mine. ,Y

ln the operation of the mechanism the crank shaft 5 is rotated at a` uniform speed by the mechanism 4 as stated above in the direction of the arrow in Figure l. rihe parts of the mechanism are illustrated in the drawings in a position which corresponds to the extreme forward limit of movement of the conveyor trough at which point during the normal working ofthemechanism a rela tively much more rapid reversing movement of the trough is effected than at the opposite limit ofmovement thereof.

The operation of the mechanism will be described with reference to the graphs shown in Figures 7 and 8 and is as follows The co-ordinate'OX in each of the graphs indicatesindegrees the uniform rotation of .the crank shaft .5 and the co-ordinate OY um'forml velocity of the conveyor trough for both the forward and return strokes.

rl'he dotted vline FY `indicates the velocity the trough would have if its motion corresponded vto simpleharmonic motion. The full line 6 indicates ,the velocity of the trough as produced by `a uniform rotation of the. crank shaft 5 in the `mechanism illustrated in Fig ures l to 6. The graph in Figure 7 indicates the velocity of the trough during successive forward and return strokes, whilst the graph Ain Figure 8 indicates the velocity of the said trough during success-ive return and forward strokes.v vIt will be observed. from a studiof the two graphs that the reversal of movement between the forward and return strokes Vas indicated at the point D in Figure 7 is relatively much more rapid than the reversal' of movement between the return and neat forward stroke which is indicated at the --point E in Figure 8.

During a complete cycle of operation of the mechanism it will be observed from the g-raphs'that during a forward stroke (that is, when" the conveyer and material are moving together) an acceleration of the trough is produced which is initially much slow-er than would be the case if it were moved in a simple harmonic motion. The trough is then accelerrvated into' a substantially uniform speed which is maintainedmfory avrelatively large portion of the forward stroke. Towards the end `of aforesaid, and this relatively rapid change of velocity is continued during the first small portion ofthe returnstroke after which the return stroke conforms `substantially to simple harmonic motion.

It is tok be observedA that the position of `the parts of the mechanism indicated in Figures 1 to 6, corresponds to the position which the conveyer trough would have at the point D in Figure 7.

The reciprocatory motion produced by the mechanism above ydescribed results in a movement of theV trough of the conveyer which causes the material in the trough to be carried forward therewith but the rapid reversal of movement at the end of the said forward movement of the trough causes the material, due to its inertia, to remain sub- K stantially in the forward position while the trough moves through its return stroke, the velocities of the trough during the return stroke being such as to enhance the conveying action to a considerable extent.- At the end of the return stroke thegradual `reversal of motion and the prolonged period during which this reversal is effected causes the material to settle in the trough and to be carried `forward thereby during the next forward stroke. Y

With mechanisms illustrated in the drawings suitable dimensions for the parts thereof are as follows Referring to Figure 1, the crank shaft 5 is arranged to produce a stroke of 8%. The axis of the crank shafti is disposed upon the same horizontal centre line as the axis vof the trunnions 13 and is separated there-v disposed at a distance of 4 below the axis of the trunnions 13 and crank shaft 5 whilst the pin 20 is spaced in a horizontal direction .at a distance of 14". The axis of the pin 2O is disposed at a distance of 5% below thc axis of the crank shaft 5. The link 21 has la length of 26% between centres and the crank pin 22 is spaced from the crank shaft 23 by a distance ofl/g. The holes 28 in the arm 26, 27 have a radial distance from the axis of the shaft 23 of 5%, whilst the corresponding radial distance of the holes 29vis 71/2. It is 'to be observed that the p radial line passing through the axis .of the shaft 3 and centres of the holes 28, 29 is offset in a clockwise direction from the radial line through the pin 22 bya distance of S/fg or about an anole of 39 in a clockwise direcline through the pin 22 is indicated at A .in Figure 1 whilst the radial line passing throughthe holes 28,V 29 is indicated at B, Figure 1. The length of the links 31, Figures 1 and 2, is 2 feet between centrcs,-butit is to be observed that thisv dimension is not material to the particular embodiment of the invention illustrated. I

In the arrangement illustrated in Figures f4 to 6, ther distance from the centres ofthe pin SOin the arm 27 and the pin 4-1 is 2 feet when the link 31 and articulated members 38, 39 are arranged in alignment with one antionat the centre of the pin 22. The radial other in the fully extended position thereof and the distance between the centres of each of the pins 11, 50 and the centre of the pin all is 20%.

It will be understood thatithe dimensions given above are merely indicative of the rela tive proportions of the mechanism .which give the best results in practice in accordance with the invention.

It is to be understood that numerous modifications may be made in the arrangement of the parts of the mechanism in accordance with this inventionso long as the motion imparted to the vc'onveyer trough conforms to that above described.

It will be appreciated that with the constructions of mechanism illustrated in the drawings, it is possible for the conveyer trough to be disposed relatively very close te; either side of the mechanism, thus ensuring that a minimum space is required for theconveyer plant.

Further, it will be appreciated that by the provision of the crank shaft 23 to form an 'operativeconnection between the driving Vmechanism and the conveyer trough, it is possible'for the casing 1 to be completely sealed and for the parts disposed therein to operate in an oil bath. This is a particularly important feature when conveyers are vemployed in mines as it prevents the access of dust to the bearings of the mechanism ami. therefore, materially prolongs the useful. life thereof. i Y

It will be observed from Figure 3 that a skid member 3 is provided which is of considerably greater width than the skid members illustrated in vFigures 1 to 3; This enables a larger number of anchor plates 57 to be provided on the said skid member which may, therefore, be maintained in place upon the floor of the mine by a correspondingljs-7 greater number of pit props, thus providin a'relativel much more rigid anchoraoe h b for the pin 44 upon which the entire thrust of the trough of the conveyer is imposed.

I claim 1. Mechanism for imparting reciprocatory motion to the troughs of jigger conveyers which comprises a driving crank coupled by a connecting rod to one arm of a pivot-ally mounted double-armed lever, the other arm of which is connected to a second connecting rod arranged to be operatively connected to the trough of a jigger cenveyer, both said connecting rods being disposed at acute angles to the respective arms of said doublearmed lever when the mechanism is in a position corresponding to the extreme forward limit of movement of the trough.

2. Mechanism for imparting reciprocatory motion to the troughs of jigger conveyers which comprises a crank coupled by a connecting rod to one arm of a pivotally mounted double-armed lever, the other arm of which is coupled by a second connecting rod to a slide block arranged to be operatively connected to the trough of a jigger conveyer, both said connecting rods being disposed at acute angles to the respectiveA arms of said double-armed lever and the second rod at an acute angle to the direction of movement of said slide block when the mechanism is in a position corresponding to the extreme forward limit of movement of the trough.

3. Mechanism for imparting reciprocatory motion to the troughs of jig-'ger conveyers which comprises an oil-tight casing, a driving crank disposed within said casing and the shaft of which is mounted in and extends through a bearing formed in a wall of the said casing, a connecting rod coupling said crank to one arm of a pivotally mounted doublearmed lever, the other arm of which is cou-v pled by a second connecting rod to a slide block, a link connecting said slide block to a second crank, the shaft of which is carried in and extends through at least one bearing provided in the walls of said casing and at least one arm on said second crank shaft located exteriorly of said casing for operatively connecting the mechanism to the trough of a jig-ger conveyer, and wherein the aforesaid connecting rods are disposed at acute angles to the respective arms of the double-armed lever and the second connecting rod at an acute angle in the direction of movement of the slide block when the mechanisin is in a position corresponding` to the extreme forward limit of movement of the trough.

4. Mechanism for imparting reciprocatory motion to the troughs of jigger conveyers which comprises an oil-tight casing, a driving crank disposed within said casing and the shaft of which is mounted in and extends through a bearing formed in a wall of the said casing, a connecting rod coupling said crank to one arm of a pivotally mounted doublearmed lever,the other arm of which is coupled by a second connecting rod to a slide block, a link conneetingsaid slide block to a 'located eXteriorly of said casing for operatively connecting the mechanism to the trough of a jigger conveyer, and'wherein the aforesaid connecting rods are disposed at acute angles to the respective arms of the doublearmed lever and the second connecting rod at an acute angle to the direction of movement of slide block and the said link at an acute angle to the second crank when the mechanism is in a position corresponding to theextreme forward limit of movement of the trough.

5. Mechanism for imparting reciprocatory motion to the troughs of jigger conveyers which comprises a driving crank, a connecting rod coupling said crank to one arm of a pivotally mounted double-armed lever, the other arm of which is coupled by a second connecting rod to ay slide block, a link connecting said slide block to a Asecond crank, a pair of arms on said second crankshaft, one of a pair of coupling rods secured at one end to each of said pair of arms, and a bar member reversably mounted at the other ends of said coupling rods, so that it may be arranged to extend upon either side thereof and means for connecting said bar member to the trough of a conveyer, and wherein both the aforesaid connecting rods are disposed at acut-e angles to the respective arms of the double-armed lever and the second connecting Y rod at an acute angle to the direction of movement of the slide block when the mechanism is in a position corresponding to the eXtreme -ing crank disposed within said casing and the shaft of which is mounted in and extends through Va bearing formed in a wall of the said casing, a connecting rod coupling said 1 crank to one arm of a pivotally mounted double-armed lever,the other arm of which is coupled by a second connecting rod to a slide block, a link connecting said slide block to a second crank, the shaft of which is carried in and extends through at least one bearing provided in the walls of said casing, a pair of arms on said second crankshaft located eX- teriorly of said casing, one of a pair of cou.

pling rods secured at one end to each of said pair of arms, and a bar member reversably mounted at the other ends of'said coupling rods, so that it may be arranged to extend upon either side thereof and means for connecting said bar member to the trough of a jigger conveyer, and wherein both the aforesaid connecting rods are disposed at acute angles to the respective arms of the doublearmed lever and the second connecting rod at an acute angle to the direction of movement of the slide block when the mechanism is in a position corresponding to the extreme forward limit of movement of the trough.

7. Mechanism for imparting reciprocatory motion to the troughs of jigger conveyers which comprises a driving crank, a connecting rod coupling said crank to one arm of a pivotally mounted double-armed lever, the other arm of which is coupled by a second connecting rod to a slide block, a link connecting said slide block to a second crank, at least one arm on said second crank shaft, an operative connection between the said arm and one arm of a pivotally mounted doublearmed lever, the other arm of which is arranged to be connected to the trough of a conveyer and means whereby the last said doublearmed lever may be mounted upon the mechanism so as to extend upon either side thereof, and wherein both the aforesaid connecting rods are disposed at acute angles to the respective arms of the first said double-armed lever and the second connecting rod at an acute angle to the direction of movement of the slide block when the mechanism is in a position corresponding to the extreme forward limit of movement' of the trough.

8. Mechanism for imparting reciprocatory motion to the troughs of jigger conveyers which comprises an oil-tight casing, a driving crank, disposed within said casing and the shaft of which is mounted in and extends through a bearing formed in a wall of the said casing, a connecting rod coupling said crank to one arm of a pivotally mounteddouble-armed lever, the other arm of which is coupled by a second connecting rod to a slide block, a link connecting said slide block to a second crank, the shaft of which is carried in and extends through at least one bearing provided in the walls of said casing and at least one arm on said second crankshaft, located exteriorly of said casing, an operative connection between the said arm and one arm of a pivotally mounted double-armed lever, the other arm of which is arranged to be connected to the trough of a conveyer and means whereby the last said double-armed lever may be mounted upon the mechanism so as to extend upon either side thereof, and wherein both the aforesaid connecting rods are disposed at acute angles to the respective arms of the first said double-armed lever and the second connecting rod at an acute angle to the direction of movement of the slide block when the mechanism is in a position corresponding to the extreme forward limit of movement of the trough.

9. Mechanism for imparting reciprocatory motion to the troughs of jigger conveyers which comprises an oil-tight casing, a driving crank disposed Within said casing and the shaft of which extends through a bearing provided in a wall of said casing, a connecting rod coupling said crank to one arm of a pivotally mounted double-armed lever, the-other arm of which is connected to a second connecting rod, and an operative connection extending through said casing between said second connecting rod and means for ,connection to the trough of a jigger conveyer and wherein both said connecting rods are disposed at acute angles to the respective arms of'sad double-armed lever when the mechanism is in a position corresponding to the extreme forward limit o-f movement of the trough. I

l0. ln a mechanism for imparting reciprocatory motion to the troughs of )igger conveyers the combination o-f the following part-s having substantially the relative dimensions specified driving crank having a stroke of 8.25 units couple'dby a connecting 'rod of 15.5 units to one arm of a pivotally mounted double-armed lever, each arm of which is 5.25 units, the distance between centres of the -crankshaft andthe ypivot of the doublearmed lever being l5 units, and a second connecting rodconnected to the other arm of said lever and arrangedto be operatively connected to the trough of a-jigger conveyer, both said connecting-rods being disposed at acute angles to the respective arms of said lever when the mechanism is in a position corresponding to the extreme forward limit of movement of the trough. i

1l. VIn a mechanism for imparting recipro'catory'motion to the troughs of jigger con-` ve'yers the combination of the following parts having substantially the relative dimensions speciiedz-a driving crank having a strokel of 8.25 units coupled by a connecting rod of 15.5 units to one arm of a pivotally mounted double-armedlever, each arm of which is 5.25

units, the distance between centres of the crankshaft and the pivot of the double-- armed lever being 15 units,and a second connecting rod `8.7 5 units long connecting the. other arm of said double-armed lever to a slide block adapted'for connection to the trough of a jigger conveyer, both said connecting rods being disposed at acute angles to the respective arms of the double-armed lever and the second connecting rod at an acute angle to the direction of movement of the slide block when the mechanism is in a position corresponding to the extreme forward limit of movement of the trough.

12. Mechanismfor imparting reciprocatory motion to the troughs of jigger conveyers which comprises a driving crank,.having a stroke of A8.25 units, a connecting rod 15.5 units long 'coupling said crank to one arm 5.25 unit-s long of a vpivotally mounted double-armed lever, the other arm 5.25 units long of which is coupled by a second connect- 26.375 units long' connecting said 'slide block to a secondcrank oi" 6.5 units radius, a pair et' arms 5.25 units long on saidsecond crankshaft, one of a pair of couplingvv rods secured at one end to eachv ot said pair of arms, and a bar member reversably mounted at the other ends of said coupling rods, so that it may be arranged to extend upon either side thereof and means for connecting; said bar member to the trough of a jigger conveyer, and wherein l@ both the aforesaid connecting rods are dicposed at acute angles to the respective arms of the double-armed lever and the second connecting rod at an acute angle to the direction of movement of the slide block when the 35 mechanism is in a position corresponding to the eXtreme forward limit of movement of the trough.

13. Mechanism for imparting reciprocatory motion to the trough of jigger convey- 29 ers which comprises a driving crank having a stroke of 8.25 units, a connecting rod 15.5 units long coupling said crank to one arm 5.25 units long of a pivotally mounted double-armed lever, the other arm 5.25 units 25' long of which is coupled by a second connect' ing rod. 8.75 units longl to a slide block. a linlr 26.375 units long connecting said slide block to a second crank of 6.5 units radius, at least one arm 5.25 units long on said second 35 crankshaft, an operative connection between the said arm and one arm 20.875 units long of a pivotally mounted doublearmed lever, the other arm 20.375 'units long of which is arranged to be connected to the trough of a '35' eonveyer and means whereby the last said double-armed lever may be mounted upon the mechanism so as to extend upon either side thereof, and wherein both the aforesaid connecting rods are disposed at acute angles to Il@ the respective arms et the first said double armed lever and the second connecting rod at an acute angle to the direction of movement ot the slide block when the mechanism is in a position corresponding to the eXtreme e5 forward limit of movement of the trough.

In testimony whereof, I affix my signature.

ERNEST RIDGILL.

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