US1759003A - Conveyer for mixers - Google Patents

Description

May 20, 1930. F. A. DAVIDSON CONVEYER FOR MIXERS Filed Oct. 1, 1927 4 Sheets-Sheet '1 F. A. DAVIDSON CONVEYER FOR MIXERS May 20, 1930.

4 Sheets-Sheet Filed Oct. 1, 1927 y 1930. F.. A. DAVIDSON CONVEYER FOR MIXERS Filed Oct. 1, 1927 4 Sheets-Sheet May 20, 1930. F. Al DAVIDSON CONVEYER FOR MIXERS File d Opt. 1, 1927 4 Shets-Sheet -4 Patented May 20, 1930 UNITED STATES ATENT FFECE CONVEYEB roa mixnns Application filed flctober 1, 1927. Serial No. 223319.

My invention is a conveyor for mixers such and conveyed to the mixer, this being in regulated amounts as required by the proportions of the mixture.

Another object of my invention is the construction of a machine preferably mounted on wheels for transportation and having bins in which the aggregates, such as sand and stone, or a mixture. of the sand and stone,

may be dumped directly from dumping trucks. In connection with these bins, a horizontal conveyor is utilized to convey these aggregates longitudinally of the carriage or vehicle while the bins are being gradually dumped. In connection -with this mechanism I have a hopper with a discharge chute for cement so that the cement may be dumped into the longitudinal conveyer in the proportions required for the load discharged from the bins. In connection with the horizontal conveyer I have an elevating 80 conveyor which receives the aggregates with the cement incorporated therewith, and car- Ties this to a suitable elevation where it may be discharged into an adjustable spout to be dumped into the concrete mixer, the spout being arranged to tilt at difierent inclinations, to the horizontal and vertical and to swing in an are, so that the material may be discharged on'one side or the other of the machine or straight ahead. 40 Another object of vmy invention is having an automatic control for the conveyors, this control being adjustableand being arranged to set so that after a predetermined period of operation, the conveyers arestopped; this stoppage may be controlled to. synchronize with the mixing in the concrete mixer and to feed the material after the mixer has dis-' charged the mixed concrete.

Another object of my invention is-in having a clutch nechanism operated by hand so that the bins may be dumped by a dumping arrangement connected to a continuously rotatable shaft, there being a plurality of these bins and each bin being controlled separately.

, In constructing my invention 1 have a suitable carriage structure with wheels and an adjustable device to raise or lower the carriage structure to different elevations in regard to the wheels. On the carriage I so have a pair of bins which are pivotally mounted near the center of the carriage, the outer sides of the bins having means to elevate them for dumping. The bins discharge into an endless conveyer having buckets: which travels in a horizontal direction, regeiving the aggregates dumped from the ins.

A hopper with a chute for cement discharges at the rear end of the'earriage into the horizontal conveyer, there being a platform adjacent the chute on which bagsof cement maybe placed; also, I have a driving engine mounted on this platform. Extending from the rear end of the carriage there is an elevator with an endless conveyer having buckets, this being adjustable to different inclinations and swinging on a horizontal pivot. A spout is connected to the outer end of the elevator by guard plates having a horizontal pivot with anadjustable arrangement to tilt the guard-plates, the spout swinging from the guard plates on a vertical pivot.

Extending upwardly from the carriage 35 there is a frame structure and the rear frame structure has a plurality of transverse shafts one of which is driven from the englne, and by means of suitable gearing motion is conveyed fromthe driven shaft to counter shafts, these shaftshaving means to drive the horizontal conveyers and the conveyer I in the elevator. I provide a screwconnected with the conveyor operating shafts, and with a nut engageable and disengageable" with said screw, this nut having a construction for operating the clutch to release the j clutch after a predetermined travel, thereby stopping the conveyers. The nut may be held out of operation When desired, The bins are dumped by a block and cable construction connected to the frame, the ends of the cables being wound on drums on one of the counter shafts, these drums being controlled by man ually operated clutches. For the sake of simplicity I prefer to change the inclination of the elevator by a manually operated drum.

My invention will be more readily understood from the following description and drawings, in which:

Figure 1 is a perspective view of my invention.

Figure 2 is a longitudinal vertical section.

Figure 3 is a vertical transverse section on the line 3-3 of Fig. 2 in the direction of the arrows.

Figure 4 is a partial side elevation of the rear end showing the elevator and discharge spout.

Figure 5 is a vertical transverse section on the line 5-5 of Fig. 2 in the direction of the arrows.

Figure 6 is a detail vertical longitudinal section through the transverse screw and the nut co-operating therewith.

The carria e structure and frame of my invention is su stantially as follows having reference particularly to Figs. 1 through 5;

The carriage structure is designated generally by the numeral 11 and has a horizontal platform or table 12 with de ending flanges 13 at each side. Substantial rackets 14 are secured to the lower side of the platform at about the center and longitudinally extending arms 15 are, secured to these brackets by pivot pins 16. These arms have a downwardly inclined section 17 and a horizontal section 18. The horizontal sections have 20. Straps 21 limit the downward movement of the castor wheels. These wheels may be forced downwardly by hand operated screws 22 operating through nuts 23 on the platform 12, the lower ends of the screws engaging the arms 18 as illustrated at 24.

A frame-work, designated generally by the numer al 25, is constructed with corner posts 26, a post 26' adjacent the rear corner,

a pair of side posts 27, and an intermediate rear end post 27 The corner post on one side at the rear is set in from the corner, as illustrated in Figs. 1 and 3. The upper ends of the posts are connected by top cross beams 28. There are longitudinal side top members 29 and a center longitudinal strap 30, and longitudinal bars 31 connecting the two rear top cross beams 28.

The driving mechanism involves the following features An engine 35 is mounted on the platform 12 and by means of a belt and pulley or other drive 36 rotates the main shaft 37 which is journaled in the rear posts 26, 26 and 27'. There is a clutch shaft 39 below the main shaft 37 and is driven therefrom by a sprocket chain drive 40. This shaft is journaled in the rear post 26 and the intermediate post 27 An upper shaft 41 is journaled in the rear posts 26, 26 and 27 and is driven from the clutch shaft 39 by a chain and sprocket drive 42. A lower shaft 43 is journaled in one of the side flanges 13 and in a downward extension 44 of the post 26 and a yoke 45 extending downwardly from the intermediate rear post 27'.

The conveyer construction comprises a longitudinally extending trough constructed in the center of the platform 12 from the front end partly towards the rear end, and in this trough is carried the upper run 51 of an endless conveyer 52, this conveyer having buckets 53 mounted on a sprocket chain 54. This chain passes over a rear sprocket gear 55 on the shaft 43 and a front idler sprocket gear 56. The lower run of the horizontal conveyer hangs below the trough 50.

An elevator has side plates 61 and a bottom plate 62. The lower end is mounted on a pivot shaft 63 which is ournaled in the side plates 64 of a discharge hopper 65 which extends rearwardly from the rear end of the trough 50 and is rigidly secured to the under part of the platform 12. An upper shaft 66 is journaled at the upper end of the side plates 61 of the elevator 60. Sprocket gears 67 and 68 are carried by the shaft 63 and the shaft 66 and over these pass the chains 69 of an endless conveyer 70 having buckets 71, the upper run following along the upper surface of the plate 62. The pivot shaft 63 is driven by a sprocket chain 72 from a gear 73 on the lower shaft 43 to a gear 74 on the shaft 63. castor wheels'l9 connected thereto by swlvels In order to give a positive drive to the sprocket 68, a sprocket chain 75 is operated from a sprocket gear on the shaft 63 and a sprocket gear 76 on the shaft 66. The elevator is raised and lowered by means of a cable 76 connectedthereto by a bail 77, this cable passing over a pulley 78 on the rear intermediate post 27 and is wound on a drum 79 operated by a hand crank 80; this drum being on a shaft 81 journaled in a bracket on the post 27 A guard plate 85 is mounted on a horizontal pivot 86 in the side plates 61 of the elevator, this guard plate having an end plate 87 which extends across the end of the eleva tor. It is provided with an operating arm 88 which may be engaged in any one of a series of notches 89 on a plate 90 secured in a fixed position on one of the side plates 61. This arm has suflicient resiliency to allow movement from one notch to another. A vertical pivot bolt 91 depends from a cross pin 92 of the guard plate, and a spout 93 is mounted in a rotatable manner on this pivot bolt, being retained in position by the head 94 of such bolt. 'The spout may be turned from one side to the other, or discharged directly to the rear of the machine.

The bin construction and the means for actuating same is substantially as follows, having reference particularly to Figs. 1 through 5: I

There are two bins'designated 100. Each of these bins has a base plate 101, an outside rim 102 and front and rear rims .163. The inner edge 104 of the bins is free of obstructions and is positioned substantially centrally over the upper run of the horizontal conveyer in the trough 50. Each of these bins is mounted on a pivotal structure 105 positioned adjacent the edge of the trough. 50.

The bins are tilted in the following manner: Front and rear cables 106 and 107 are connected through pulley blocks 108 attached to the rim 102 and to blocks 109 attached to the upper part of the frame. These cables lead to the rear of the frame and are wound on a drum 110, there being two of these drums loosely mounted on the up er shaft 41; one drum handles the cables from the bin on one side and the other drum, the cables from the a bin on the other side of the platform.

The manipulation of the cables is through the medium of clutches 111, each of, which has a fixed clutch jaw 112 secured to the shaft 41. The shiftable clutch jaws 113 are connected to the drums 110. A ratchet 114 is secured between the drums 110 and the shiftable clutch jaw 113. Combined pawls and yokes 115 are slidably mounted on a bar 116'. These have a yoke arm 117 to engage in the groove 118 between the ratchet 114 and the slidable clutch jaw 113 and also have a tooth 119 to engage the teeth of the ratchet (note particularly Figs. 2 and 3). There are two operating arms 120 and 121 each of which has a horizontal rod 122 and vertically depending rods 123. Theselatter are adapted. to engage in notches 124 in a plate 125 which is secured to the rear corner post 26 and to the intermediate post 27'.

The ends of the rods 122 have a crank arm 126 which is hooked into each pawl and yoke 115, as indicated at 127.

The manner of operation to control the dumping of the bins is substantially as folows:

As above mentioned the upper shaft 41 is constantly rotated, being driven from the main power shaft 37. Therefore the clutch jaws 112, being mounted on this shaft, constantly rotate. Either one or the other of the shiftable jaws 113 may be engaged with the fixed jaws 112 by releasing the operating arms 120 and 121 from the notches 124 and shifting these longitudinally so as to pull or shove the combined pawl and" yokes 115;

thus either one of the drums '110 is brought into rotation by the shaft 41 and winds in the cables 106 and'107. When the bins are raised to the desired extent, which may be fully tilted or at any angle, the clutches 111 are thrown out and the operating arms 120 and 121v rocked again into the notches. This brings the pawl into engagement with the ratchet, thereby holding either or both of the drums 110 stationary.

When it is desired to lower the bins, the operating arms are rocked outwardly, which action disengages the awl tooth from the ratchet and allows the rumsto rotate freely on the shaft 41. The weight of the bins then causes them to return to the horizontal position, as shown in Fig. 1. (Note, particularly Figs. 1, 2 and 3.)

Cement may be fed to the conveyers by means of a hopper 130 which has a slidable gate 131 discharging into the chute 132 which empties into the trough 50 through which the upper run of the conveyer 52 operates. (Note Figs. 1 through 4.) J

The automatic, stopping of the conveyers involves "the screw 135, which is peened or otherwise connected to the shaft 43, and hence rotates so long as this shaft rotates. arm 136 having a nut threaded section 137 is slidably mounted on a cross rod 138 and has a handle 139, there being a bent section 140 (note particularly Figs. 3 and 6). A spring 141 is secured between the arm 136 and thefixed part of the vehicle such as the under side of the platform 12. It will be seen that as the nut 137 is a halfnut, by rocking the arm 136, this may be disengaged and the nut shifted from one end of the screw 135 to the other or to any intermediate point.

The clutch shaft 39 has a clutch 145 thereon which has a clutch jaw 146 rigidly secured thereto and a shiftable clutchjaw 147 which is connected to the sprockets which receive the drive from the sprocket gearing 40 from the main shaft 37 and also convey the drive to the upper shaft 41 through the sprocket gearing 42. A clutch collar 148 having a groove is connected to the shiftable jaw 147. This groove is engaged by a pivoted plate 149 mounted on a pivot 150 secured to the rear post 26 and constantly pressed outwardly by a spring 151. This plate is connected in a groove 152 on a rocking arm 153 which has one part 154 extending inwardly through the post 26, and the lever end 155. The part 154 is provided with a shoulder 156.

When the half nut 137 is moved to the left, as indicated in Fig. 3, the arm 136 particularly the part 139, comes in contact with the plate 149 and presses to the left, compressing the spring 151. This action draws the jaw 147 into disengagement from the jaw .146 of the clutch 145 on the shaft 39, thereby preventing driving from the clutch 39 to the shaft43 or to the upper shaft 41. When the shoulder 156 is thrust outwardly sulficiently to be on the outside of the rear corner post 26, the weight of the lever end 155 turns this downwardly. so that it is rotated partly and en ages the outer side of this post, thereby holding the plate 149 in its retracted po sition, consequently disengaging the clutch and stopping the movement of the shaft 43, thereby stopping both the horizontal conveyer andthe conveyer in the elevator.

In order to limit the movement of the nut to the left or starting point, a pin 158 may be fitted in any one of a series of holes 159 in the platform 12. In order to hold the nut disengaged, the arm 136 may be rocked by pulling on the handle 139 and a hook 160 secured to the platform 12 may engage over the bent section 140. This holds the nut outwardly from the thread 135, as indicated in dotted lines in Fig. 6.

The operation of the conveyer control mechanism is substantially as follows:

The pin 158 may be placed in the proper hole 159 so that when the arm 136 with the nut 13'? travels from this pin, which engages the upper portion of the arm 136, to the left, as shown in Fig. 3, or to the right, as shown in Fig. 1, the arm comes to its extreme position and disengages the clutch 145; thus stopping the conveyers.

It will, therefore, be seen that this arrangement may be manipulated to allow the conveyers to operate for a certain definite time period and then to come to a stop. This may be so arranged as to feed the aggregates in the bins 100 to the horizontal conveyer at the desired rate of speed, the operator dumping the cement in the cement hopper 130 in accordance with the amount of material which is required for each batch of the concrete mixture.

Various changes may be made in the principles of my invention without departing from the spirit thereof, as set forth in the description, drawings and claims.

I claim:

1. In the art described, the combination of a platform having a longitudinal central trough, an endless conveyer having its upper run operating horizontally in said trough, bins pivotally mounted on the platform on each side of the trough, a frame structure above the platform, a cable and pulley block connection between the frame and the bins, a rotatable shaft having drums loose thereon on which said cables are wound, means to actuate said shaft, clutches to engage and disengage the drums and the shafts, and means to operate the conveyer.

2. In the art described, as claimed in claim 1, a discharge hopper connected to the rear end of the platform, an elevator having side plates and a bottom plate pivotally connected to said hopper, an endless conveyer operating in said elevator, the upper run of said conveyer being positioned to receive material dumped from the upper run of the conveyer in the trough, a cable connected to the elevator, and a winding mechanism on the frame to operate said cable to vary the tilt of the elevator.

3. In the art described, a platform having an endless conveyer operating longitudinally thereof, a plurality of bins pivotally mounted on the platform to discharge on the upper run of the conveyer, an elevator, means pivotally connecting same to the platform, a second endless conveyer in the elevator, a frame extending upwardly from the platform having a power driven shaft therein, a clutch shaft mounted in the frame and having a clutch, means to drive the clutch shaft from the power shaft and means to drive the elevator from the clutch shaft, a screwthreaded shaft driven from the clutch shaft, a shift able and disengageable nut engaging the screw, and means actuated by the shiftable nut at the end of its travel to disengage the clutch and hence stop the operation of the conveyers.

4. In the art described, as claimed in claim 3, the nut being connected to an arm, said arm being slidably mounted on a cross rod, means connected to the platform to limit the movement of the said arm in one direction, forming a starting place for engaging the nut and the screw, and means to lock the clutch out of engagement when disengaged by the said nut.

5. In the art described, the combination of a platform having an endless conveyer operating lengthwise thereof, means to discharge material on the upper run of said conveyor, an elevator having a second conveyer positioned to receive material discharged by the first conveyer a frame extending upwardly from the platform and having a power driven shaft, a clutch shaft in the frame, a shaft having a screw, a clutch on the clutch shaft, 9. gear and sprocket connection between the power shaft and the clutch shaft operating through said clutch, a sprocket and gear connection between the clutch shaft and the shaft having the screw, means to actuate the conveyers from the shaft having the screw, a disengageable nut to enga e the screw, said nut having an arm, the arm eing slidably mounted on a cross rod, 2. spring to engage the nut and the screw, a pivotally mounted plate with means interconnecting the plate and one part of the clutch, the arm of the nut being ada ted to engage the plate at the end of its stro e and shift the plate, thereby shifting the clutch, and means actuated by the movement of the plate to lock the plate in a shifted posltion holding the clutch open.

6. In the art described, as claimed in claim 5, a platform having a series of holes, a pin fitting in said holes, the pin forming a limit to the positioning of the arm of the nut on the cross rod, givin an initial position for engaging the nut wit the screw.

7. In the art described, a platform having an endless conveyer extending lengthwise thereof, a pair of bins pivotally mounted on opposite sides of the conveyer to dump thereon, a frame extending upwardly from the platform, cables connected by pulleys between the frame and the bins, a power driven shaft journaled in the frame, a second shaft journaled in the frame having drums loose thereon, said drums winding in the cables, clutches on the second shaft to interconnect with the drums, a ratchet connected to each of the drums, a pivotally mounted pawl and yoke to engage each of the clutches and each of the ratchets, means to shift each of the combined pawl and yokes to shift each of the clutches to operate each of the drums, and means to engage each of the pawls to each of the ratchets to hold the drums with the cables wound thereon to the desired extent.

8. In the art described, as claimed inclaim 7, the means to shift the combined pawls and yokes comprising rods having a crank connection to each of the combined pawls and yokes, said pawls and yokes being pivotally mtzlunted, and means to slide and to rock said ro s.

9. In the art described, an elevator having an endless conveyer operating therein, a guard plate pivotally mounted on the elevator for adjustment about a vertical axis, the elevator having a structure with a series of notches, an operating arm connected to the guard plate and interengaging the notches to hold the guard plate in adjusted position, and a spout swivelly connected to the guard plate for adjustment about a vertical axis.

10. In the art described, the combination of a platform, a pair of brackets connected thereto at substantially the center considered transversely, a pair of arms pivotally connected to each bracket, castor wheels pivotally connected to each of the arms,operatin screws threaded through the platform an having their free ends engage the said arms to vary the adjustment of the platform relative to the castor wheels.

the arm of the nut atthe of travel thereby opening the .clutch on the clutch shaft engage the pawls to the ratchets and to dis- I engage same.

In testimony whereof I have signed my name to this specification.

F. A. DAVIDSON.

11. In the art described, the combination of a platform having an endless conveyer operating len hwise thereof, an elevator con- "nected to t e rear end of the conveyer and having a second endless conveyer receiving material'dumped by the first conveyer, bins pivotally mounted on the platform to discharge into the first conveyer, a frame exclutch shaft and from the clutch shaft to the screw shaft and to the upper shaft, means connected to the upper shaft to tilt the bins,

a disengageable nut havin an arm slidably mounted on a cross rod wi means to engage the nut and the screw, a clutch release device mounted on the frame and bleby

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