US1994181A - Cake forming or molding machine - Google Patents

Description

March 12, 1935. F. c. SIMON CAKE FORMING OR MOLDING MACHINE Filed Aug. 2, 1952 3 Sheets-Sheet 1 M ki Mr March 12, 1935. Q ON 1,994,181

CAKE FORMING OR MOLDING MACHINE Filed Aug. 2, 1932 5 Sheets-Sheet 2 March 12, 1935. 0N 1,994,181

CAKE FORMING OR MOLDING MACHINE Filed Au 2, 1952 3 Sheets-Sheet 5 Patented Mar. 12, 1935 UNITED STATES CAKE FORMING on MOLDING MACHINE Forest 0. Simon, Piqua, Ohio, assignor to The French Oil Mill Machinery 00., Piqua,-hio I gApplication August 2, 1932,, Serial No. 27,289 10 Claims. (Cl. 100-51) This invention relates to improvements in cake forming or molding machines of the sort disclosed in U. S. Patent No. 1,202,824 of October 31, .1916 to A. W. French and also in U. S.

.5 Patent No, 1,896,563 issued to me on' February l injury to the apparatus.

7, 1933. These machines are commonly used-for forming or molding oil bearing meal into cakes which are afterwards placed in presses where the oil is expressed from the meal.

In these machines, the meal is compressed into a shallow cake in a mold or forming box to which the meal is delivered by a reciprocating charge box which receives-a charge of meal from a. meal cooker, moves over the mold for depositing the charge of meal therein, and is then retracted from the mold. The cake mold is usually arranged at the upper end of a vertically movable ram between which and a head block above the ram, the cake is compressed. The charge box is reciprocated by fluid pressure actuated mechanism under the control of a hydraulic valve. A swinging end gate at one end of the mold is movable downwardly to an operative position to close that end of the mold and as it assumes such position, it operates a control valve of a fluid pressure actuated mechanism to cause the charge box to advance over the'mold. A reciprocable end gate operated by said fluid pressure actuated mechanism moves with the charge box to close the opposite end of the mold, and a slide valve, also actuated by said fluid pressure actuatingmechanism, advances with the charge box to close the discharge chute "from the cooker after the charge box has moved from beneath the same. The hydraulic control valve for the fluid actuated mechanism, actuated by the movement of the end gate to operative position, has been, in prior practice/arranged at a considerable distance from said end gate and as a result, the operative connections'between them have been relatively complicated and, expensive. v I

The fluid pressure actuated mechanism usually includes a double acting cylinder having a piston connectedto the charge box so that the latter is advanced and retracted by the admission of pressure fluid to one end or the other of said cylinder, while the reciprocating end gate and the slide valve before mentioned, are advanced by plungers arranged in single acting fluid pressure operated cylinders, and are retracted by the engagement of the charge box with said members at an appropriate time in its movement away from the mold. It is usual to provide means, in some prior constructions actuated by the charge box, for slowing down the rearward movement of the charge box and its piston by choking the fluid pressure discharge from the cylinder thereof at the time that the charge box is about to engage said members so as to avoid clashing and possible An object of the present invention is to improve and simplify the construction of cake forming machines of the sort described so as to render them easier and more reliable in operation, and to reduce the number of parts employed therein so that such apparatus will be more compact and less expensive to manufacture.

Other objects are toprovide a machine of this sort in which the control valve for the fluid pressure actuating mechanism may be actuated by movement of an end gate through means of greatly simplified construction, as compared with means for this-purpose heretofore in use; also to provide novel means whereby said end gate and valve may be automatically locked in their respective operative positions during the advance of the charge box; also-to provide a control valve and end gate locking means arranged so as to be operable to release the gate and valve from. locked position by the charge box during or at the termination of the mold charging movement thereof; also to provide an improved valve actuating mechanism and end gate locking mechanism comprising few parts arranged in compact form and constructed so as to be mounted adjacent said end, gate.

Another object is, to provide a cake former or molding machine with novel and practical means by-which the speed of movement of the charge box maybe retarded or modified during an intermediate portion ;of its'rearward stroke as it is about to engage and move rearwardly the reciprocatingend gate and the slide valve of the apparatus. Y l V 1 Various other objects and advantages will be apparent from the following description of one embodiment of the invention, and the novel features thereof will be particularly pointed out in connection with the appended claims.

Fig.1 isa rear elevation of an embodiment of my improved cake formenwith the charge box in position to receive a charge of ,meal from the meal cooker. V

r Fig. 2 is a longitudinal, sectional elevation, on an enlarged scale, of the charge box and associated-parts in the same relative position as that shown in Fig. 1. r

' Fig: 3 is-anenlarged, fragmentary vertical section of aportion of the charge box cylinder.

Fig. 4'is a fragmentary rear elevation, on an enlarged scale, of a portionof the swinging end gate, the control valve for the fluid pressure actuated mechanism and the operative connections between said gate and valve.

Fig; 5 is an end elevation thereof, partly in section, withthe parts in the same position as shown in Fig.4.

Fig. 6 is a fragmentary. sectional elevation, on a still larger, scale, showing the control valve locked in position in which it effects movement of the charge box cylinder to a position over the mold.

Fig. '7 is a fragmentary rear view similar to Fig. 4, but showing the partsirr'the; position which they assume; directly. afiter the end gate and valve locking mechanism has been released to permit the control valve to return to its nor-..

mal position corresponding. to. that shnwn in Figs. 4 and 5.

Fig. 8 is a longitudinal section of a portion of the charge box cylinder on: enlarged. scale-.1

Fig. 9 is a fragmentary front elevation partly in section, of a portion of the cake mol'd showing the main operating valve of the machine, the control valve being in position for effecting the advance of the charge box. o

Thecake forming machine shown in the drawings includes a stationary cylinder A, Fig.1, having therein a vertically reciprocabl'e ram, not shown, at the upper end of which is a'ram cap or mold C arranged to move up and down therewith. Ahead block D is hi-nged toone side of the cylinder to swing downwardly over the top of themold and between which and the mold the charge of meal or material is pressed. An end gate or member E is pivoted atlO to theouter' end portion of the ram-cap: or mold Cf at the rear side thereof so as to-swing vertically downward across the end of the mold adiacent the head block D toclose that end'ot the mold. A charge box F normally resting upon. a sliding end gate G below the discharge chute or openihg'I-I of a cooker or container for the meal or material to be molded, is adapted to. reciprocate from this position to one over the cake mold C to: deliver.

' thecharges of meal thereto. The sliding end gate G advances with the charge box until it reaches a position in which it extends crosswise of and closes the opposite endof the moldC. 'The charge box F meanwhile continues over the mold and is arrested when its forward end is over the lowered swinging end gate Ef A sliding valve I is arranged in rear of and follows the charge box in. its advance, moving to a position in which it closes the meal chute and prevents the discharge of the material therefrom except when said charge box is beneath the chute;

The charge box F is-'operatively-connected to a rearwardly extending piston 12 working in a horizontal cylinder 1 3- mounted: upon the frame of the machine. A control valve or element 20', Figs. 4, band 7-, forthe fluidpressure actuated mechanism controls the passage pressure fluid from a suitable source to and from the charge box cylinder 13'. Supply and discharge pipes 21 and: 22 are provided for-'respecti veh conducting-the pressure fluid to and from the-valve 20; and pipes 23 and 24 lead from the valve to the front-and rear ends respectively of the cyli-rider'*- 13-. The valve or element 20 includes a casing 25 having therein a reciprocable valve element orplunger 26'.

The charge box cylinder 13 is a double acting onein which the pressure is maintained at all times on the front end of the piston 12'by way of the supply pipe 21-, a port 27 inthe valve casing, and the pipe 23 The valve element '26 is shownin Fig. 4'- in its lower position, and-the gate E is extending inoperatively upwards. Inthis position of the valve element, the pipe 24 leading to the rear end or the cylinder to is connected to the discharge pipe 22 by way of ports 28 and 29 in the valve casing. The effective'area of the rear end I211 of the piston is larger than that of the front end of the piston so thatas, the'valveelement 26' is moved. from thailowerposition shown in said Fig. 4 to the upper position shown in Fig. 6, the pipe 24 is disconnected from the discharge pipe 22 and is connected by its port 28 with; the supply port 27, sothat the fluidv supply under pressure will also be admitted throughpipe 24 to the rear end of the cylinder, thus act ing. on the larger area at the rear end 12a of the piston and creating a pressure difference which causes the piston and the charge. box F to ad-' vance. Whenthe valve element 26 is returned.

frontarea of the piston will then cause a retrac 7 tion of the piston and'the charge box.

Theslidin'g end'gate c; as shown in Fig. zyis operatively connected at its rear end to the for ward end of a plunger or piston 9' operating a single acting or one-way cylinderig. "I'he rear endof the cylinder is connected by-abranch 24a to thepipe 24 and-another branch 24?) connects this pipe to the rear end of a second single acting or one-way cylinder 1' in which 'is arranged a piston 2" having its front end connected to-the slide valve 1, before mentioned. Therefore, when the pressure is admitted to the pipe 24 by the upward movement of the valve element 26 toadvance the charge box F, the pressure will also be admitted to the cylinders 'g and i in rear of their pistons by way of said branches 24a and 24b, thus causing the sliding end gate G andthe slide valve Ito advance to their operative positions. When, therefore, the valve element 26 is again lowered'and the pipe 24 placed in communication with the dischargpipe 22 torelieve the cylinder 1 13, the cylinders g and 2 will also be relieved, en-

The return of the end gate G andslide' valve I .abling the respective pistons to be'moved back,

totheir initial positions is efiected by the engage ment of a block 1 on therear endof the charge boxwith abutments g and i respectively on said" members at a certain point in the rearward travel of the charge box. "This operation will be'later referred to more in detail.

Themold or ram cap C is elevated and lowered 5 l j by the admission to and discharge from the cylcating with said cylinder A. This-valve maybe I actuated by'a' suitable hand lever 31 under the control of the operator? In accordance with the embodiment of theinvention illustrated, thevalve 20- is stationarily mounted upon a fixed bracket 32 secured to the rear of the stationary cylinder'A beneath' the rear'end of the end gate E. The valve element 26 is operatively'connected to the end gate E, so as to'b'e actuated by the up and down movements thereof, by a single device or member interposed between the gate and said valve element. For this purpose, the stem of the valveelement 26 is flattened and is extended upwardly through the casing 25 and is provided with a. terminal, laterally extending shoulder 35. f n

The end gate E is provided with an arm 33 extending rearwardly of itspivot 10. This arm is.

provided with aswivel connection or fitting 361; Y

to which is pivoted, as by a bolt or stud a'lfthe' upper. end of a hook device or member 38, The

lower portion of this device is cut away as shown;

at 39 to provide a lateral terminalhookor beak portion 40. This hook'or-b'eak portion 40 normally extends into the plane of and beneath the shoulder 35 of the valve element 26, while the shoulder 35 of the valve element extends into the recess or cut away portion 39 of the hook device. The parts are preferably yieldingly held in this position by a leaf spring 41'secured to the side wall of a housing 42 enclosing the upper part of the valveand saiddevice 38.

The housing 42 is preferably provided with a removable side cover or part 43 to permit access to the interior, and the hook or device 38 preferably extends downwardly through an opening 44 in the top wall of the'housing. This opening is preferably closed by a suitable yielding packing member 45 which permitsithe necessary movement of the device 38 while preventing the entrance of meal or other matter into the housing 42. r

A depending, swinging latch or looking member 46, arranged in the housing '42 and pivoted 'a't47 on a wall thereof, is'provided with a transverse, inclined cam edge. 48 which, by the action of a suitable spring 48a, secured in the housing 42, is caused to bear against a'transversely extending stud 49 projecting from the lower .endof the hook device 38. At the upper end of the cam edge 48, the latch member 46 is provided with an inwardly extending shoulder 50.- As shown, the lower end of the hook device 38 is provided with a pair of. laterally extending fingers 52' which straddle the opposite flat faces of theupwardly extending part' of the valve stem so as to prevent the valve from turning, thereby maintaining the shoulder 35 at all times in the. plane of, and in operative relation to, the hook or beak 40 of the device 38.

.With" the parts'of the machine arranged as shown in Fig. 1, the valve element 26 will be in its lower'position, (see Figs. v4 and 5) with the 'beak or hook portion 40 ofv the device 38 disposed below. and in spaced-relation to theshoulder 35 of the valve member and the end gate E will be extending in its upwardly, inoperative position.

If now the handle of the end gate E is grasped and the gate lowered to its horizontal operative position crosswise of the mold C, the consequent movement of the gate about its pivot 10 will cause the hook device-38 to be elevated andits beak or hook portion 40 to engage the shoulder '35 and lift the valve element 26 to the: upper position shown in Fig. 6. The fluid pressure will thus be admitted to the rear end of the cylinder 13 by wayofport 28 and pipe 24. The piston 12 will thereupon be moved outwardly to advance the charge box F to a position over the mold for'de-' positing the material therein. The sliding. end

gate C and slide valve I will follow the charge box F, stopping respectively in position to' close the other end of the mold to prevent the spilling of material therefrom, and to close the spout H of the cooker, these movements being determined by the stroke of the pistons g and ton 12.

The shoulder hook device 38,?and end gate E, in the operative positions to which they have been moved.

As soon as the meal has been deposited in the mold C, the charge box is retracted so that it will assume its original position. to receive another charge. For this purpose, the valve 20 must be actuated to disconnect the pipe 24 from the supply pipe 21 and connectit with the discharge or exhaust pipe 22 so as to relieve the pressure on the rear end 12a of the piston 12.

For this purpose, a suitable kick out device or member is disposed so as to be operable by the charge box to disconnect the hook device 38 from the latch member 46. The means shown comprises a bell crank lever pivoted at 60a upon the rear side of the mold C. This lever has a depending arm 61, at the lower end of which is an inclined cam face or part 62 which normally rests against the laterally projecting stud 49 of the member 38 by the weight of the lever in both the upper and lower positions ofsaid member 38. The other arm 63 of the lever 60 extends laterally towards the charge box and is provided with an upwardly facing, terminal cam 64 which, by the engagement of the stud 49 against the face 62, is positioned-and held in the path of an inclined cam or projecting plate 66 secured, to the side of the charge box F. The cam 66 is so arranged that approximately at the time the charge box reaches the extreme limit of its advance stroke, in which it extends over the end gate E, and has deposited the meal in the mold C, the cam 66 will ride upon the cam 64 of the lever, depressing the arm 63 thereof and swinging the depending arm 61 towards the left, as shown in Fig. 7. This action forcibly disengages the stud 49 from the shoulder 50 of the latch device 46 and also causes the beak 40of the member38' to be shifted laterally out of engagement with the shoulder 35 of V thevalve element 26 against theaction of the spring 41. The end gateE and valve element 26 are now released and the latter can descend by gravity to its original position to disconnect the pressure fluid from the rear-end 12a of the pis- Since the pressure supply is always maintained upon the front end of the piston 12 through the pipe 23, as explained, the charge box F will now be retracted, and as soon as its forward end moves away from its position over the released end gate E, the latter will return automatically to its upward inoperative position by the action of a counterweight 68 on the rear arm 33 thereof in the usual manner.

In order to prevent the latch member 46 from moving towards the left with the stud 49 of the hook device 38 under the action of the spring 48a, when the stud is shifted by the lever 60, a stop pin 69 fixed in the housing 42 is preferably provided against which the lower end of the latch device 46 abuts, as shown in Fig. I.

For the purpose of slowing down the rearward movement of the charge box as the block ,1 thereon is about to engage the abutments g and i of the sliding end gate G and the sliding valve I respectively, the following .novel means are employed (see Figs. 2, 3 and 8). Outwardly beyond the enlarged rear end 12a of the piston 12, said piston is provided with an elongate axial stem '70 terminating'in a concentric, cylindrical enlargement or follower 71., The cylinder 13 is provided beyond its rear inlet connection with the pipe 24 with an axial enlarged chamber '72 communicating with the piston chamber proper by a reduced concentric bore or choke passage 73 which is of such diameter as to permit the iollower 71130 slida bly, fit "therein, and also by a lateral or bypass :passagei74 and port 75., which port :is under the control or" a-check valve 76. The rear end of the chamber '72 is preferably inv communication 'with'a small terminal chamber or trap .'7.8 by :way. :01" a reduced eeritral restriction or passage .79. The lateral'passage 74. and the check valve 76 are shown-as be-- ing arranged. in the cylinder itself, but. if de-' sired, these could be arranged in a'pipe exteriorly of said cylinder.

In the retracted position of the piston 12 and charge box F, the parts of the piston .just described will be. in the position shown in Fig- 2, with the reduced stem 70 extending through the bore or choke passage .73 and in spaced relation to the walls thereof. At thisitime thefollower 71 extends through the terminal passage 79, in which it has an easy fit, and projects into the trap or chamber 78.

When the and gate E is lowered and the valve element 26 is actuated and raised to permit the passage of the pressure fluid through the pipe 24 to the rear end of the piston. 13 acting thereupon to advance the charge box, the: fluid also acts upon and opens the check valve 76 and enters the chamber 72. As the piston 12 moves outwardly to advance the charge box F, the follower 71 will slidably engage in and pass through the choke passage 73 and into the cylinder 13, but since the pressure fluid is passing freely into the chamber ".72 by; way of the port '75 and maintaining the valve 76 in. openposition, the advance of the piston 12 will notice checked. Thus, the charge box'will move to its material discharging position over the mold C without any reduction in speed. s

However, after the end gate .E and valve element 26 have been released .from the hook device 38 through the disengagement of the locking' means, in the manner explained, and'the charge box has moved .rearwardly for some dis tance, the follower 71'wi1lreenter thechoke pase sage 73. This action takes place preferably just prior to the engagement-of the block" '1. with the abutments g and i In the continued rearward movement of the piston 12, therefore, a fluid drag will be created, as the hind will be trapped in the'charnber '72 by the entrance of the rear end of the follower into said chamber which causes the fluid therein to be placed under increased pressure. This pressure will .react upon and close the check valve 76. There-is a small groove or bleeder passage '80 in the check valve 76 connecting the pas'sage74 with the port 75.. Therefore, the speed of travel of the piston will be choked or reduced in accordance with 'the es capeof the fluid from the chamber 72 through said bleeder groove or passage 30in the check valve, and these conditionswillcontinue until the follower passes out of the rear end of the passage 73. The interval duringwhich the follower" 71 is passing thus slowly through the choke passage 73 is sufiicient to permit the charge box to gently engage and start the rearward movement of the sliding endgate G and the sliding valve I.

endof the iollowerrenterssthe restriction or "passage 79.- This; action willwtrap the fluidinthe chamber ;78,-thereby slowing 'downiand cushthe control 1 valve adjacent :the swinging end 1 gate requiring .only the .simplemeans described 15 for'actuatin'gthe' valve, andafor locking. the latter and theend. gate inqoperativec positions. Also by "locating: the relatively simple choking means directly in the cylinder for;.thercharge box position, a direct and'practical control; of

the speedfof the piston may :be effected during] its return stroke to enable thesameto be reduced during :and; subsequent. tocthe engagement 'of the chargebox with the gateG and yvalve l; e

IclairnZ"..--. 1. In a cake molding; machine, the combine tion of'a mold having-an endrm'ember movable. to an operative'position forclosing an end of said mold,- a charge box :movabl'e to deposit material 'in"said mold,. operating means for said charge'box including a valve disposed below said end member, and a pivoted vdevice, carried by and depending'from 's'aidend member and which I directly engages" and moves said valve. upon 1 movement of said end member to operative position to initiate movementJofnsaid' charge box oversaid mold to deposit the "material therein.

2. In a cake molding machine the combination' ofqa-mold having arrend 1memberImov-- able to anoperative position for closing'an end ,40

of saidmold, a charge box movable to-deposit material in said mold, operatin'g 'means' for said-1 charge-box including a valvedisposed below said end member andwhich is operable: to initiate 1' movement of said charge: box over said'mold to r deposit material therein, a locking "member "operable for holdingsaid end member inu'operative 'p'ositi'on," and device mounted upon said end member which automatically engages; and 'actuates said valve and also engages and actuates said locking means for locking said end member when and by the movement of the latter to' its' operative position; 3. In 'acake molding machine, the combination of a. moldhaving an end member movable to an operative position for closing an end of said mold; a charge box movable to -deposit gnaterialin .said mold, operating meansfor: said charge box including a valve, ;a;pendent hook device mounted upon'saidend member candlengageable 'directly with said valve upon, movement of said end member cooperative position to operate said valveand initiate movement ofsaid 7 charge box over said mold to deposit the mate- 1 rial therein, and a locking memberieng'ageable H with said device when saidend member has been so movedto lockpsaid device, said end member and said valve in their respective operative t-- s'itions.

1 4=;In a cake "molding machine, the combination'oi a mold having an end membermovable toian operative position for closing-an endof said mold, a charge box movable to deposit me.- I terial in said mold, operating meansfor said charge box including avalve; azdevice mounted, Z5.

directly upon said end member which is movable into and out of direct engagement with said valve and engages and actuates said valve to initiate movement of said charge box over said mold upon and by the movement of said end member to operative position, and means automatically operable by movement of said device to valve engaging position for locking said device in engagement with said valve to positively retain the latter in actuated position during said mold charging operation.

5. In a cake molding machine, the combination of a mold having an end member movable to an operative position for closing an end of said mold, a charge box movable to alternately advance over and deposit material in said mold and be retracted from said mold, operating means for said charge box including a valve disposed below said end member, a pendent hook device pivoted on said end member which is engageable directly with a part on said valve and actuates said valve in one direction to cause the advance of said charge box upon movement of said end member to operative position, and means on said charge box acting when said charge box is in advanced position to disengage said hook device from said valve whereby the latter may move in anopposite direction, and effect the retraction of said charge box.

6. In a cake molding machine, the combination of a mold having an end member movable to an operative position for closing an end of said mold, a charge box movable to alternately advance over and deposit material in said mold and be retracted from said mold, fluid pressure actuated means for operating said charge box including a cylinder and a valve controlling and normally preventing pressure fluid in said cylin der from effecting the advance of said charge box, a valve operating device mounted on said end member and directly engageable with said valve to shift the same to permit pressure fluid is said cylinder to effect the advance of said charge box over said mold for depositing material therein upon movement of said end member to operative position, and kick out means automatically operable when said charge box is in advanced position for effecting disengagement of said device from said valve to permit the return of said valve to normal position, thereby reversing pressure fluid action in said cylinder and eiiecting the retraction of said charge box.

7. In a cake molding machine, the combination of a mold having an end member movable to an operative position for closing an end of said mold, a charge box movable to deposit material in said mold, operating means for said charge box including a valve disposed adjacent said end member, a valve operating device mounted on said end member and engageable directly with said valve upon and by the movement of said end member to operative position to operate said valve and initiate movement of said charge box over said mold to deposit the material therein, a latch automatically engageable with a part on said device and which part upon completion of the operative movement of said end member is retained by said latch in position to positively lock said end member, said deviceand said valve in their respective operative positions, and a freely movable member mounted upon said mold which,

when the material has been deposited in said mold, is actuated by said charge box by the passage of the latter over said member to disengage said latch from said device and thereby efiect the'release of said valve and said end member.

8. In a cake molding machine, the combination of a mold having an end member movable to an operative position for closing an end of said mold, a charge box movable to deposit material in said mold, operating means for said charge box including a valve positioned adjacent said end member, a valve operating device mounted on said end member, and which device is positioned to directly engage said valve upon and by the movement of said end member to operative position to operate said valve and initiate charging movement of said charge box over said mold, a locking pin on said device, a pivoted latch having a shoulder and which upon completion of the operative movement of said end member and said device, moves to engage said shoulder with said locking pin on said device, thereby positively locking said end gate, said device and said valve respectively, a lever freely suspended on a pivot on said mold in position to be engaged by a part on said charge box when the latter is in advanced position to disengage said locking pin from said shoulder and release said valve, said device and said end member.

9. In a cake molding machine, the combination of a mold having an end member movable to an operative position for closing an end of said mold, a charge box for the material to be molded, fluid pressure actuated mechanism for advancing said charge box over said mold to deposit the material therein and to retract said charge box, a valve controlling said fluid pressureactuated mechanism, a hook device on said end member engageable directly with a part on said valve upon movement of said member to operative position to actuate said valve in one direction and advance said charge box, a pivoted latch which, upon completion of said operative movement of said end member, interengages with a part on said device and locks said device and also looks said valve thereto, a lever pivoted on said mold in position to be engaged by a cam face on a side wall of said charge box when the latter is in its advanced position to disengage said latch from said hook device of said end member and permit the operation of said valve in an opposite direction for retracting said charge box.

10. The combination in a cake forming machine having a charge box, of fluid pressure actuated means for shifting said charge box between different positions alternately, reciprocable members which are also actuated by said fluid pressure means to move simultaneously with said charge box in one direction of travel thereof and V which are moved in an opposite direction by engagement therewith of said charge box during a portion of its travel in that direction, said fluid pressure actuating means including a cylinder to which said fluid pressure is admitted, a piston secured to said charge box and operable in said cylinder, and means in said cylinder for creating a fluid drag upon said piston and retarding its movement and that of said charge box during said portion of the travel of the latter in which it engages and moves said members.

FOREST 0. SIMON.

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