US1374789A - Fluid-pressure feeding mechanism - Google Patents

Description

G. E. WHITE,

FLUID PRESSURE FEEDING MECHANISM.

APPLICATION FILED JAN-20,1919. 1,374,789.

Patented Aprf 12, 1921.

G. E. WHITE. FLulo PRESSURE FEEDlNG'MECHANIsM.

` APPLICATION FILED IAN.20, 1919. 1,374,789. Patented Apr. 12, 1921.

2 SHEETS-SHEET 2.

PATENT' oFFIcE.

GILBERT ii'. WHITE, or DES MOINES, IOWA.

FLUID-PRESSURE FEEDING MECHANISM.

Specification of Letters Patent.

Patented Apr. 12, 1921.

Original application filed April 15, 1918, LSerial No. 228,593. Divided and this application iled January 20, 1919. Serial No. 272,200.

To all whom t may concern l Be it known that I, GILBERT E. WHITE, a citizen of the United States of America, and resident of Des Moines, Polk county, Iowa, have invented a. new and useful Fluid-Pressure Feeding Mechanism, of which the fol provide means` connected with and operable in conjunction with the means for successively directing blasts of iuid pressure to effectthe forcible discharge of measured, quantities of plastic material, for succes-` sively bringing such measured quantities of plastic material within the range of such successive blasts.

Myinvention consists in the construction, arrangement and combination of elements hereinafter set forth, pointedy out in my claims and illustrated by the accompanying drawing, in which- Figure 1 is an elevation, partlyin section, of the complete aireblast discharging apparatus and the fluid-pressure feeding mechanism involving my present invention. Fig. 2 is a sectional elevation of a portion of the apparatus at` right angles to Fig. 1. Fig..3 is a cross-sectionon an enlarged scale on the line 3-3 of Fig. 2, portions being broken away to economize space. Figa is a b-ottom plan of a portion of the machine.

In the construction ofthe apparatus as shown the numeral 10` designates a suitable receptacle or tank, generally cylindrical in form and vertically disposed. VA niche or y pocket 11 is formedin the wall of the re-y ceptacle 10 and extends from a point adja cent the upper end of said receptacle to a point near the lower end thereof, where said niche is formed with a bottom 12which is provided with an opening 13. A feeding member 14:, preferably formed as a metal disk, is mounted on the bottom 15 of the receptacle 10 and pivoted at its center thereto, preferably by means of a stud 16 having a conical upper end portion or head 17 within the receptacle and secured by a key 18 beneath said bottom. The feeding member 14 Y extends and is adapted for rotary travel between Vthe bottom 12 of the niche and the bottom 15 of the receptacle. The receptacle or tank 1Q is adapted to receive and contain the plastic material to be discharged, and

*the means for directing intermittently the air blasts for such purpose is fully illus-y trated and kdescribed in my parent application above referred to, and is here illus trated and described only for the purpose of providing a 'setting and basis for the clear and full yunderstanding of the present inits upper'end is formed with a globular valve casing 20 having a valve seat 21 at its lower end adapted to receive a ball valve 22 and close the passage through said standard at times. A hollow, laterally extending boss 23 is formed on the standard 19 im- Y niediately below the valve casing 2O and said boss is closed at its outer end by a cap 241. A rock shaft 25 is journaled hori zontally in and extends across and projects at both ends from the boss 23 and an elbow 26 is mounted on and secured by a set screw V27 to said rock shaft within said boss and standard. -The free end of the elbow 26 e'n-V gages the lowermost point of the ball valve 22, thus adapting said elbow to raise ysaid valve at times. A blast chamber 28 is providedand is formed with a tubulararm 29 tapped into the upper end of the standard 19 above the valve casing 20, and said blast chamber also is provided with a vertically y with a seat 34 to close entrance to the blast.'

chamber at times. A cut-off valve casing 35 is threaded on the upper end of the valve casing 32 and carries a cut-off valve 36', shown conventionally, adapted for manual actuation to control entrance to the valve casing 32. A supply pipe 37 is tapped into the cut-olf valve casing 35 and serves to supply the operating medium such as com-V pressed air from a tank or pump (not shown) to the blast chamber. The lower end portion of the cylinder 30 normally is closed by a cap 38 mounted thereon and locked against accidental removal by a set screw 39. A piston rod 40 is mounted for reciprocation in the cylinder 3G and blast chamber 28, having slide bearings in the center of the cap 38 and in a brace 41 formed in the blast chamber. The upper end portion of the piston rod 40 is adapted loosely to engage at times with and raise the ball valve 33 from the seat A piston head 42 is fixed to and between the ends of the rod 40 and is adapted to reciprocate within the cylinder 30. mounted loosely on the piston rod 40 and rests on the cap 38. An expansive coil spring 44 is mounted within the cylinder' 30 and impinges at opposite ends on the piston head 42 and washer 43, said spring having the function of returning the piston head to its uppermost position in the cylinder'. in arm 45 is fixed to one outer end portion of the rock sh aft 25 and normally' is inclined upwardly and outwardly. A pitman 46 is pivoted at its forked up Der end to the outer' end portion of the arm 45 and extends loosely through a hole in the outerm ost portion of the bottom 12 of the niche 11, whereby stability is given to said pitman in reciprocatory operation hereinafter described. T he pitman 46 is formed with a longitudinal slot 47 and is externally threaded throughout the length of said slot and compassing the lower terminal of the pitman. A lever 48 is mounted loosely through the slot 47 of the pitman 46 and is pivoted at one end to a forked lower end portion of the piston rod 40., the opposite end portion of said lever extending loosely through a hub 49 (Fig. 3),v

which hub is pivoted, as by a concealed bolt 50, to a boss 51 formed or mounted on one side of the standard 19 just above the base of said standard. Spaced nuts 52,k 53 are screwed on the pitman 46 on opposite sides of the lever 48 and are secured by jam nuts 54. The spacing of the nuts 52, 53 provides for a range of movement of the lever 48 bee A washer 43 isformed on or fixed to the bottom 15 and communicating with a discharge pipe or hose 56. Pockets v57, preferably holes of greater kdiameter at their lower than at their upper ends and arranged in an annular row concentric with the axis of the stud 16, are formed in the marginal portion of the disk 14 and are adapted to register successively with the hole 13 and the initial end of the elbow 55. It is the function of the pockets 57 to carry plastic material from the receptacle 10 and hold it, in partition-like manner, across the passage from said hole to said elbow; and when such condition exists andthe valve 22 is opened, a blast of air passes through the standard 19 and discharges said plastic material from said pocket 57 in register as described, through the elbow 55 and discharge pipe 56. To effect such result it is necessary to provide means for 'intermittently rotating the disk 14 successively tov present pockets 57 in register with the hole 13 and elbow 55 and such means should be synchronized with the mechanism above described for controlling the valves 22 and 33.

The operating means for the disk 14v consists preferably of a bell-crank lever 58 suitably fulcrumed on a bracket 59 and provided at the upper end of its vertical arm with a spring-pressed dog 60 adapted to engage and coperate successivelyv with ratchet teeth 61 formed in the lower side of lsaidV disk; said dog being arranged to operate through a slot 62 in the bottom 15 of the,

receptacle. The bell-crank lever 58 is operated andthe movement thereof synchronized with the valve-operating means by a connecting rod 63 forked at both ends and pivoted at said ends respectively to the lever 48 and the outer endof the recumbentarm of said bell-crank lever.

In practical use of the apparatus as described the plaster or cementitious mate* rial, or any other suitable material' desired to be used with the device, is mixed directly in or receivedV after mixing by the rece tacle 10 and owing to the weight thereofA said material is supported directly on the disk 14 and lls'the exposed pockets 57 of said disk. After loading the receptacle 10 with the desired quantity of materialy the valve 36 is opened manually; it being presumedk that the supply pipe 37 is in communication with a source of compressed operating medium such as air in sufficient quantity and at required pressure for vactuation of the device and carrying out the various functions dependent thereon as above described; and the parts of the apparatus stand as illustrated inFigs. l and 2 with the exception noted as to the valve 36. Pressure from the pipe37, resisted ,by the valve 22, fills and equalizes in the valve chamber 28, arm 29 and mouth of the cylinder 30 and acting on the piston head 42 mo-ves the same downwardly against the tension of the spring 44, thus moving the piston rod 40 downwardly and permitting the valve 33 to seat and cut off temporarily admission of pressure from the pipe 37. The downward movement of the rod 40 effects a movement of the lever 48 through an are which performs two operations: namely, oscillation of the bellcrank lever 58 through the rod 63 and consequent one-step movement of the feeding disk 14 to the end of advancing one loaded pocket 57 into register with the hole 13 and elbow 55; and the other operation of opening the entrance to the standard 19 by movement of the elbow 26 through an arc to raise the ball valve 22, such movement being effected by engagement of the lever 48 with the nut 53 and consequent downward movement of the pitman 46. It will be noted that the range of movement provided for the lever 48 between the nuts 52, 53 permits feeding movement of the disk 14 prior to the opening movement of the valve 22. When the two operations resulting from the downward movement of the piston rod 40 have been completed, the pressure trapped in the valve chamber 28 and arm 29 is exerted through the standard 19 and hole 13 to drive the charge of plastic material contained in the registering pocket 57 through the elbow 55 and discharge pipe 56 to the end of depositing said charge with force as a separate entity on a surface to be coated. By this means the pressure in the blast chamber is permitted to equalize with external air pressure and the way is prepared for reaction of the piston head 42 under pressure of the spring 44 to its normal position, which has the effect of returning the piston rod 40 upwardly. The upward movement of the piston rod 40 has three functions: namely, returning the bell-crank 58. in preparation for the next step movement of the feeding disk, permitting the valve 22 to close, and opening the valve 33 for recharging oi the blast chamber 28 from the source oi pressure supply. Then the operation of the movable parts of the apparatus is re# peated to the conclusion of the work in hand, the exhaustion of the supply of'plaster, or manual closing of the valve 36; all of said movements beingv automatic except the operation of the latter valve. It sometimes occurs that the parts become locked by incomplete reaction and the valves 22-and 33 become simultaneously closed or the spring 44 remains compressed, in which event the' valve 31 is manually opened to release air pressure in the chamber 28.

Eitheror both of the nuts 52, 53 may-be adjusted relative to the threaded rod 46 or toeachother, to regulate therelative 'differences in time of actuations of the said rod 46 and the bell-crank lever 58.

By the synchronizing of the feeding disk operating means with the means for alternately operating the valves 22, 33 the operation of the machine is rendered automatic and little attention is required on the part of the operator.

I claim as my invention- 1. In a machine of the class described, a member mounted for rotary travel, a member mounted for reciprocation, a lever pivoted on said reciprocating member, a bellcrank lever suitably fulcrumed, a pawl pivoted on said bell-crank lever and adapted for engagement with said rotary member to `cause step by step rotary movement thereof,

a link pivotally connecting said lever and bell-crank lever, a rod extending across said l lever, a member adapted to be oscillated by said rod, and means on said rod adapted for engagement by said lever to move said rod, such engagingmeans being so arranged that movement of said rod occurs subsequent to oscillation of said bell-crank lever through said link.

2; An air motor, comprising a cylinder,

an air passage communicating with one end portion 'thereof and formed with a valve seat, a valve adapted to rest on said seat and close said passage, a piston mounted for reciprocation in said cylinder, valve-opening means connected with said piston and acting to hold said valve in open position at times, means acting on said iston to hold it normally in such position t at the valve is in. open position, said passage also being formed with a second valve seat, a valve normally resting on said seat and closing said passage, a lever pivoted to said piston, connections extending from said lever and adapted to open the second mentioned valve when the piston is moved to permit closing of the rst mentioned valve, and means connected with said lever for operating a work object.

3. An air motor, comprising a vertically arranged cylinder, an air passage communieating with the upper end of said cylinder and formed with a valve seat arranged on the axis of said cylinder, a valve adapted to rest on said seat and close said passage, said passage also being formed with a second valve seat, a valve normally resting on said seat and closing said passage, apiston-rod mounted for reciprocation in said cylinder,

a piston-head on said rod intermediate of its ing adapted to raise the first named valve at times, said piston-head being adapted to be depressed by air under pressure in said passage, a spring adapted to return saidpis- 5 ton-head to its uppermost position, a lever pivoted to said piston-rod, connections eX- tending from said lever and vadapted to open the second mentioned valve when said piston-head is depressed, and means connected With said lever for operating a Work ob`eot.

Signedat Fairmont, in the countyo-:t arfield and State'of Oklahoma, this 20th day of December, `1918. v y

GILBERT'E. WHITE.

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