US2316973A - Feeding mechanism for shaker conveyers - Google Patents

Description

April 20, 1943.

C. Ai PRATT -FEEDINGVMECHANISM FOR SHAKER CNVEYERS Filed Dec. l, 1941 .5 Sheets-Sheet l v. n NN L Ap 20, 1943. c. A. PRATT FEEDING MECHANISM FR SHAKER CIONVEYERS 3 Sheets-Sheet 2 Filed Dec. l, 1941 April-.H209 w43 QA. PRAT'T v M5313 FEEDNG MECHANISM FOR SHAKER CONVEYERS Filed Dec. 1, 1941 l 3 Sheets-Shale?. 3

IN V EN TOR.

.\ Y' 60 m ga/r/i/ E17/( ATTO R NE Patented. Apr. 20, 1943 FEEDING MECHANISM FOR SHAKER VCONVEYERS Charles A. Pratt,'Chicago,` Ill., assignor to Goodman Manufacturingcompany, Chicago, Ill., a corporation of Illinois Application December 1, 1941, Serial No.i421,141

(Cl. ISS- 220) 2 Claims.

This invention relates to improvements in feedingmechanisms for shaker conveyors of the type used for picking up and transporting loose material such coal, rock, or the like in mines.

The principal object of the invention is toprovide a positive feeding meansfor an extensible trough section, auxiliary to the friction gripV feeding mechanism, for feeding said extensible'trough section'where the pitch of the coal seam may be such as to impair the efficiency of the friction grip feeding mechanism.

More particularly, the present invention constitutes an improvement in the type of auxiliary ratchet feeding me-chanism disclosed in the Letters Patent of Loyal F. Crawford, No. 2,251,118, issued July 29, 1941, and reissue-d January 20, 1942, as No. 22,008, whereby said auxiliary ratchet feeding mechanism is provided with automatic means for imparting a plurality of successive feeding strokes to the extensible trough section,`

when desired, so as to eliminate any necessity for manual control of the friction grip mechanism during the operation of the ratchet feeding mechanism.

The invention may best be understood by reference to the accompanying drawings in which:

Figure 1 is a view in side elevation of a shaker conveyer trough line, showing a friction grip `feeding mechanism of conventional form, with an auxiliary positive feeding mechanism constructed in accordance with my invention associated therewith;

Figure 2 is a top plan View of the trough line shown in Figure 1;

Figure 3 is an enlarged view in side elevation of the trough line with the friction grip block mechanism adjusted in position to advance the extensible trough section, and showing parts of the auxiliary feeding mechanism in substantially` of the bearing `plates I9, I9.

and the method Vof providing fluid pressure in the system. Y

In the drawings, the embodiment of my `invention illustrated includes a shaker conveyer trough line I0 fhaving `a swivel II interposed therein, to permit'theforward-end of the trough line `to `be.swung from side to side and enable material to be `gatheredufrom various pointsalong a working face. `Said swivel-is of an ordinary construction well known .to those skilled in the artand has` a conveyer trough section I2 secured to and projecting lfrom its forward end.

, The conveyer .trough section I2'has a friction grippingtype of feeding mechanism I5 pivotally mounted on the forward endthereof and disposedin advance thereof, which-is adapted to extend Yor retract an extensible trough section I6 with *respect to said l conveyer` trough section. Said extensibletroughsection is mounted at its rear end on a shoe II and has a shovel I8 pro- 4 jecting from the forward end and lforming acontinuation thereofand resting upon the ground at its forward end. Flanged bearing plates I 9, I9

extend laterally from the upper sides of said extensible trough section, and are adapted to form V-a track for flanged'rollers'2li,v 2li mounted in the 'ufpwardlynprojecting sides of a bracket 2 I. i bracket extends :beneath and forwardly from and Said upwardlyalong `opposite sides Aof said conveyer trough section and forms a support for thefeeddescribed in so far asis necessaryy to' make vmy present ,inventiony clearly understandable. Said feeding mechanism includesa pair of spaced car- .rier membersv 22, 22 eachhavingza pair of fric- -tion grip blocks r23 and 24 which are adapted to selectively engage the upper and lower surfaces Said carrierv members each have pivotal connection at. their lower end withl a spring link 25 `which forms a means for .engaging saidgrip blocksrwithsaid bearing plates. Saidy spring linksare Idisposed .below the trough section -Iland are 1vyieldablyi mounted in *aforked bracket 26,' which projects forwardly fromand is pivotallymounted on the forward end of the bracket 2|. -A link 29 is pivotally connectedto the upperend of each of said carrier members fon a bolt 30, which bolt also forms a means for pivotally connecting the upper gri-p 4.block 124 .to saidv carrier member. Said link exmounted on opposite ends of a transverse shaft 34 which is mounted adjacent its' ends in the brackets 26, 25. Said hand levers are operatively connected with the carrier members 22, 22 to change the inclination thereof, by means of cranks 35, 35, mounted on the shaft 34 between the sides of the brackets 25, 26, and links 32, 32 connecting said cranks with the cranks 3|,

3| (see Figure 3). i

A iiuid pressure cylinder 35 is pivotally mount- Ved at its rear end on a bracket 31 beneath the trough section I2 by means of a transverse pin 55. Said cylinder is provided with a `piston 43 having a piston rod V43 extending forwardly therefrom. Said piston rod has a pawl44 pivotally mounted on the forward end thereof on a pin 45 secured at its ends in a forked bracket 45 which is secured to the forward end of said piston rod. A compression spring 41 is provided to yieldably hold said pawl in engagement with a rack 48 mcunted on and extending along the underside of the extensible trough section I6. The structure previously described is similar to that disclosed in previously mentioned Reissue Patent-l No. 22,008.

Referring now more particularly to the novel features of my invention, I provide a second pawl 55 pivotally mounted between the side walls 55, 55 of an arm 51 adjacent the rear end of the latter, by pin 58. at its froni-l endto the pivot pin 38 on bracket 31. A compression spring 59 is provided to yieldingly hold the pawl 55 in engaging position relative to the rack 48. A

The cylinder 3G and arm 51 are simultaneously raised or lowered about the axis of pin'r33 to permit their respective pawls 44 and 55 to' be moved into or out of engaging position relative to the rack 48. In the form shown, this adjustment is afforded by either one of the hand'levers 33` The arm 51 is pivotally connected L pawl 44, and cams 63, 63 controlling the position of pawl 55, are so shaped that when the hand levers 33, 33 are positioned to extend the extensible trough section I6 with respect to the tion relative to the rack 48, as shown in Figure 4.

v chored by mine jacks 13, 13 and the pump being 5|, 5|, respectively, mounted on the underside of the conveyer trough section I2 in spaced apart brackets 52, 52 depending from the bracket 2|" (see Figure 6). Said shafts each have an eccentric disc or cam 53 on the inner end thereof ladapted to have engagement with projections 54 projecting laterally vin opposite directions from the forward end of the cylinder 36.'

Similarly, the rocking levers 60, 63 are'secured to the outer ends of a pair'of shafts 6|, 6|, respectively, mountedin spaced- apart brackets 62, 62 depending from the trough section I2, and

each having an eccentric 63 on the inner end thereof adapted to have engagement with projections 64 projecting laterally in opposite directionsfrom the rearend of arm 51, as shown in Figure'1."..V

Thecams 53, 53 controlling the position of operated by means of a pendulum 14 which is reciprocated by the shaking'movement of the trough line I0 in the usual manner. Details of the fluid supply and control means need not be described in detail, as they form no part of the invention, excepting to point out a manual control valve 15 with valve handles 16 for supplying air through pipes 11, 18 leading to opposite ends of the cylinder 36. i

With the construction and arrangement above described, it will be understood that when the conveyer is operated along an ascending grade of such a pitch that the friction grip blocks 23, 23 and 24, 24 will not efficiently extend the extensible trough section I5,V manipulation of the Valve handle 16 Willcause the piston 40 and pawl 44 engaging the rack'48, to positively extend said extensible trough section, through aV stroke equal to the permissible movement of the piston 40 in cylinder 36. During this extending movement, the teeth of rack 48 willmove forwardly relative to the pawl 55 with the usual ratcheting action. After the piston 43 has been moved to thelimit of its forward stroke, however, the pawl 55 will hold the extensible trough section IIi positively against retractive movement while the piston 40 l and its pawl 44 arereturned `to its initial rearward position. In this manner said piston and pawl are enabled to make as many repeated thrusting strokes as may be required to advance the extensible trough section. Y f

`While I have herein shown and described one form in which my invention may be embodied, it will be understood that the construction thereof and the arrangement of the variousparts may be altered without departing from the spirit and scope thereof. Furthermore, Ido not wish to be construed as limiting my invention to the specific embodiment illustrated, excepting as `it may be limited in the appended claims. f

I claim as my invention:

1. In a shaker conveyer, a conveyer trough section,V an extensible trough section, Vfriction feeding means actuated by movement of the conveyer for extending saidextensible trough` section, and one of said trough sections .carrying a 2. In a shaker conveyer, a conveyer trough section, an extensible trough section, feeding means for extending said extensible trough section from or retracting said extensible trough section within said conveyer trough section, control means for positioning said feeding means to extend or retract said extensible trough section, other means independent of said feeding means for positively extending said extensible trough ment relative to the other of said trough sections, and a second ratchet device forming an automatic holding connection between said trough sections While said thrusting member is being retracted for a repeated forward stroke, and means operatively connected with said control means for simultaneously rendering both of said ratchet devices ineiective when said control means is in position to cause said feeding means section including a power-operated extensible 10 to retract said extensible trough section.

thrusting member on one of said trough sections having one-Way ratchet feeding engage- CHARLES A. PRATT.

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