US2694818A - Machine for applying pressure to shoe bottoms - Google Patents

Description

Nov. 23, 1954 J. c. CANTLEY 2,694,818

MACHINE FOR APPLYING PRESSURE TO SHOE BOTTOMS Filed Sept. ll, 1951 2 Sheets-Sheet 2 Joseph C Carztlqy By h amgy United States Patent MACHINE FoR APPLYING PRESSURE To SHOE BOTT-OMS IQseph'Clifford CantleyyBeverlygMass assignor to United -Shoe MachineryCorporation,Flemingtoii, N.J.,a cory poration of New'Jersey Application September- 11, 1931, Serial No. 246,030 ITCIaims. (0. 12:46

;of-the machine'pressure'fluid is-conducted to a cylinder housing-the 'smallpiston at the corresporidih'gsta'tionof the machine, whereupon rapid upward movement of a :Ipad boxcarried .by tlie pistons is effected. After "the 'pa'dbox'has moved upwardly to clamp the 'work against heel and toe abutments, fluid 'under high pressure is "ad- 'mitted into the'large cylinder to apply heavy pressure tb thework; In-accordance with'a -featureof theinvenhim the workrei'nains under heavypresshre forr'apredetermined: period of time after which the pressure is autoinatically relieved. Provision is made in accordance with another'feature of the inverition'-for reliev-ing"the pressure If desired "at any time priorto'theel'aps'e of said predetermined period of time.

Anotherobject of the invention is to provide =an iinproved two station machine for -applying pressure to .shoe bottoms having timers .associatedwith each station for. terminating the pres'sure'applying operation of each station after 'a predeterr'nined' time, in which theftwo stations-may be under pressure simultaneously-or not as desiredrandin whichthetiming period-of eachs'tation -is independent of :the other station.

:A further object of the invention is to provide improved safety mechanism tolinsure against'injury to the operator should he inadvertently-allow his hand t'orestupon the .shoe'duringtreadling of the machine, To'this endand inaccordanceywithafurther feature ofgthe invention, a two-hand control mechanism-is provided consisting ofja pair of spaced valves,- s'irnul-taneous operation of which is required, before pressure, I exceeding thatrequired to lift the pad box and the work, may be admitted into the small cylinder. Thus treadling of either station of the machine Will 'result'only' in lifting the pad box and the work to bring the-workagainst the heel and toe abutments'but no substantial pressure is exerted'onthe work and -r 1o serious {injuryto theyoperator will :take place .shouldhishand becaught between the work andeither [of the abutments. I To apply finalpressure to the work the operator mustdepress both of the manually operated valves, the'effect .of which is to conduct fluid under high pressure to the cylinder housing 'the smallypiston. after which pr'essurefluid is conductedto 'the large cylinder, Ethe'timing period beginning after the pressure in the large cylinder reachesa predetermined'vame.

To minimize the number of-controls required for .operation of the machine and in accordance with 'a still further feature of the invention, the hand controlled valves which must beroperated to obtain final pressure in either station of the machine, are'comm'on' toboth stations. A station selectorf-valve is provided 'wlii'chis positioned in responsefto t'readlin'g either sidefof the n aliine, the {position 'of the station selector valve, con

ice

sponding'to the'stationto-be operated. Each station of the machine is provided with' a fluid pressure operated valve which is positioned upon the-application of fluid pressure thereto to peri'nit the flow of fluid under high pressure to therespective fluid=pressure operated motor, the valve being positioned'uponsifnultaneous actuation of the hand controlled'valves, the 'position of the station selector valve determining whichof-thepressure responsive valves is actuated.

The above and other features of the'inve'ntion including various novel combinationsofparts and details of construction will now be'described' by reference to the drawings and pointed out in the claims.

In the drawings,

Fig. lis a front elevation of one form-of machine in which the invention maybe embodied;

Fig. 2 is a schematic diagra'mof the fluid pressure mechanism embodiedin'the machine; and

Fig. 3 is a section throiiighoneof-the timing valves of Fig. 2. I

The invention is illustrated as embodied in a machine having a base 10inwhich are supported for vertical movements-pad boxes 1-2, 12. Rising vertically fromthe base 10'is a post 14 to the upper end of'which are secured forwardly and outwardlyexten'ding 'a rmsf16. Each arm carries at itsforwa'rd end a crosshead "18"in'which are adjustably supported toe and heel 'abutments 20, '22. Each pad box is adapted to support an'assembled outsole and lasted shoe which isrnoved upwardly'with the pad box by mechanism to be described intoengagement with the toe and heel abutm'entsto apply sole-attaching pressure to the shoe bottom.

For controlling the movements of "the" pad boxes there is provided at each side of'the machinea treadle 24, only that treadle at the left side of the" machine being illus- .trat'ed in Fig. 1. Upon depression of one of the treadles the pad box at'the corresponding side of the machine is moved upwardly by fluid pressure until 'the'las'ted shoe moves into engagement with the toe and heel abutments. The'pre'ssure'of 'th'e 'fluid'is'insuflicient at this time to exert any-substantial 'pressure on the work but is preferably just enough to'overcemethe weight of the pad box and the shoe thereon. Mounted at the front of the machine arevalves 2'6, 28havin'gupwardly extending valve "stems terminating knobsflll, Upon depression of the knobs, fluid gu'nde'rhigh pifessureis applied to the mechanism for lifting the pad whereupon heavy pressure is applied to the work. As will be explained, it is necessary, regardless of whichfside pf the machine is .being operated, to depress simultaneously both "the knobs 30, 32 in order 'to 'applly any 'substan tialamount of pressure to thework and thus the danger'of heavy pressure being "applied thereto while a hand of the operator is inadvertently placed on top of the lasted 'shoe is eliminated,'the valves 26, 28 being spaced a sufficient distance apart to requirev both hands of the operator to depress the knobs 30, 32, The initial pressure resulting from depression of the treadle 24 is, low enoughso that the operat0r may, if he desires, adjust the position of the assembled shoe andoutsole on the pad box prior .to the application of heavy pressure by depression of the knobs 30, 32. V

Located above the arms 16 andcarried by the post 14 is a'valve'34 controlled by aknob 36, the function of the valve being to permit immediate descent of that pad box which is in its upperposition upon operation of the valve by pushing the knob 36 inwardly. Under normal cond1- tions the padbox remains in its upper position for a predetermined period following depression of the knobs 30, 32 so that the assembledshoe andoutsole. remain under pressure for a time sufiicient to insure a good bond between the outsole and shoe bottom. In the event however that the assembled shoe-and outsole are not properly located on. the pad 'box and the operator fails to notice this condition prior to depression of the knobs 30, 32, or if he "desires tofor-any other reason, he may immediately relieve the'p'ressure by actuating'the valve 34 by the knob 36,.thus making it unnecessaryfio wait for the expiration of the normaltirne 'ir'it'e'rva-l during whichthe work is iir'iderpressurebefore the position of the 'work can be adjulited, thereby minimizing the danger of damaging the wor The fluid pressure mechanism for operating the machine will now be described with particular reference to Fig. 2. Many elements of this mechanism are duplicated in the two stations of the machine and for convenience are identified by like reference characters except that those at the right side of the machine are provided with a prime. The parts are illustrated in the positions they assume with the machine at rest prior to starting the pump so that no fluid pressure is exerted against any of the fluid pressure operated members of the machine. Except for those elements which are common to the two stations of the machine, the following description will refer in particular to the station at the left side of the machine, it being understood that the mode of operation of the other station of the machine is substantially identical therewith.

The pad box is carried for upward movement to apply pressure to the shoe bottom by a large piston 38 movable in a cylinder 40. Depending from and movable with the large piston 38 is a small piston 42 movable in a cylinder 44, the arrangement being such that pressure fluid is first admitted into the small cylinder 44 to act on the piston 42, moving the pad box upwardly at a high rate of speed and later pressure fluid is forced into the cylinder to act on the large piston 38 to apply heavy pressure to the work. During the initial upward movement of the pistons 38, 42, pressure fluid flows through a pipe 46 into the small cylinder 44 and the large piston 38 moving upwardly therewith draws pressure fluid from a fluid reser voir 48 (Fig. 1) through a pipe 50, a valve 52 and a passageway 54 so that the large cylinder 40 is constantly maintained filled with pressure fluid. The small piston 52 is hollowed out to receive a light compression spring 56 which acts between the piston and a fixed plate 58 to assist in overcoming the inertia of the pistons and the pad box carried thereby. A pressure controlled valve member 60 is movable in the chamber of valve 52 and has a stem projecting upwardly through the plate 58. This valve is arranged to be forced downwardly against the action of a spring 62 when the pressure of fluid in the cylinder 44 acting on the upwardly projecting valve stem reaches a predetermined value thereby to connect a high pressure supply line 64 by way of a port 66 with the passageway 54 and at the same time cut off communication between the passageway 54 and the fluid reservoir by way of pipe 50.

The cylinders 40, 44 are supplied with pressure fluid by a pump 68having an intake pipe 70 connected with the fluid reservoir and a supply pipe 72. Connected with r the supply pipe 72 are three valves which are common to both stations of the machine. These valves include a low pressure reducing valve 74, a pressure regulating valve 76 and a rellef valve 78. The reducing valve is connected by a pipe 80 with the pipe 72 and pressure fluid passes I through the reducing valve as will be explained upon treadlmg the machine to admit pressure fluid into the cylinder 44 under a relatively low pressure, just sufficient to raise the pistons and the pad box and the work carried thereby. The pressure regulating valve 76 includes a valve member 82 urged toward the left by a spring 84 to prevent flow of pressure fluid from a pipe 86 connected to the supply pipe 72, through a pipe 88 until the pressure of the fluid in the supply pipe 72 attains a predetermined high value such as 200 lbs. per sq. inch. This valve controls the maximum pressure of the fluid admitted into the cylinder 44 following depression of the knobs 30, 32. It will be understood that although this pressure is sufficient firmly to grip the work between the pad box and the heel and toe abutments it is insuflicient for the final pressure to be exerted on the shoe bottom because of the small area of the piston 42.

The relief valve 78 includes a valve member 90 urged to the left by a spring 92, the action of which may be adusted by turning a screw 94 carrying an abutment 96. Thls valve member normally occupies the position shown in which the pipe 88 from the valve 76 is closed to a discharge pipe 98 leading to the fluid reservoir. When the pressure in the supply pipe 72 from the pump reaches a sufiiciently high value to move the valve member 82 of valve 76 to the right, the pressure fluid flows through a pipe 100 to act upon the left end of the valve member 90 whereupon this valve member will move to the right permitting flow of some of the fluid back to the reservoir by way of pipe 98 and preventing the pressure of the fluid in a pipe 102 connected to the pipe 88 from exceeding a predetermined value which may be somewhere between 50 and 200 lbs. per sq. inch, for example, depending upon the position of the abutment 96. The pipe 102 is connected by way of a pipe 104, a check valve 106 and the pipe 64 with the chamber of valve 52 so that when the valve member 60 is forced downwardly, pressure fluid under control of the relief valve 78 flows into the large cylinder 40 to exert the finalhigh pressure on the work. It will be understood that even though the relief valve 78 maintains a lower pressure per sq. inch in the pipes 104, 64 than is maintained in the pipe 72 by the pressure regulating valve 76, the total pressure on the work will be greater because of the large area of the piston 38 as compared with that of the piston 42.

Each station of the machine also has a cylinder control valve 108, a pressure selector valve 110, a timer control valve 112, a timer valve 114 and a treadle controlled valve 116. The cylinder control valve 108 includes a slide valve member 117 which controls the flow of pressure fluid from a pipe 118 leading from the pressure selector valve to the pipe 46 which communicates with the small cylinder 44. With the valve in the position illustrated, the pipe 46 communicates with a pipe 120 discharging to the fluid reservoir. Pipes 122, 124 connected to the upper and lower portions of the valve, respectively, provide for flow of pressure fluid which acts upon opposite ends of the valve member 117 either to move the valve upwardly, connecting pipes 118 and 46, or returning the valve member to the position shown as will be hereinafter explained.

The pressure selector valve 110 includes a valve member urged upwardly by a spring 132 to provide communication between a pipe 134 leading from the reducing valve 74 and the pipe 118 leading to the cylinder control valve 108. Accordingly, as soon as pressure is admitted into the lower end of the valve 108 by way of pipe 124 to move the valve member 117 upwardly, the small cylinder 44 is connected to the supply pipe 72 by way of the reducing valve 74 to move the pad box and the work upwardly under light pressure. At a predetermined point in the operation of the machine, pressure fluid flows into the upper end of the valve member 110 by way of a pipe 138 to move the valve member 130 downwardly cutting off flow of pressure fluid from the reducing valve 74 to the small cylinder 44 and connecting the supply pipe 72 by way of pipe 140 and check valve 142 to the pipe 118 which is in turn in communication with the small cylinder thereby admitting pressure fluid under control of the pressure regulating valve 76 into the small cylinder 44. It will be understood as the description proceeds that pressure fluid is not admitted into the pipe 138 to force the valve member 130 downwardly until the valves 26, 28 have been operated by depression of the knobs 30, 32.

The timing valve 114 includes a slide valve member normally urged to the right by a spring 152 in which position the pipe 122 leading to the upper end of the cylinder control valve 108 communicates with a pipe 154 leading to the treadle controlled valve 116. With the pump 68 in operation and prior to treadling of the machine, pressure fluid acts on the right end of the valve member 150 to move it toward the left. The supply pipe 72 is connected by pipes 158, 160, timer control valve 112 and pipe 162 with a port 164, best shown in Fig. 3, under the control of a check valve 166. Accordingly, as soon as the pump is started the valve member 150 of the timing valve is moved to the left and the pipe 122 leading to the upper end of the cylinder control valve is placed in communication with a pipe 168 leading to the fluid reservoir. Thus the valve member 117 of the cylinder control valve is free to move upwardly when pressure fluid is admitted into the lower end of the valve by way of the pipe 124.

The timer control valve 112 includes a valve member 170 normally urged to the left by a spring 172 to provide direct communication between the pipes and 162 so that the valve member 150 of the timing valve is held in its left-hand position as long as the valve member is positioned as illustrated. The left end of the valve 112 communicates by way of a pipe 174 with the passageway 54 leading to the large cylinder 40. Accordingly, when the pressure within the large cylinder reaches a predetermined value, the valve member 170 is moved to the right against the action of the spring 172, cutting off communication between pipes 160 and 162 and providing communication between the pipe 162 and a pipe 178 leading to the fluid reservoir. Thus the'pressure fluidin theright end of the timing valve 114 may flow -back through pipe:

slowly depending upon the setting of the needle valve which accordingly determines the length of time required to return the valve member 150 of the timing valve to the position illustrated and hencetheilength of time that the work is held under pressure.

The treadle controlled valve 116 includes a slidevalve member 182 which normally assumes the position: shown in Fig. 2 in which the supply pipe 72 is connected by way of pipe 184, valve 116 and pipe 154 to the timing valve 114. At the same time, the pipe 124 leading to the lower end of the cylinder control valve 108 is connected by way of pipe 186 and valve 11610 a pipe 188 leading to the fluid reservoir. When the treadle 24 is depressed, pipe 154 is no longer connected to the supply pipe 72 but the supply pipe is connected by wayof pipes 184 and 186 to pipe 124 leading to the lower end of the cylinder control valve whereupon the valve member 117 is moved upwardly.

The hand-operated valves 26, 28 include valve members 190, 190' which are normally maintained in theirupper positions by springs 192, 192'. With the 'valvexmember 190 in its upper position the left end of an accumulator 194 is in direct communication with the supply pipe '72 by way of a pipe 196. This accumulator includesa piston 198 which is normally held in the right end of the accumulator 194 by the pressure fluid. Upon depres sion of the knob 30 causing downward movement of valve member 190 the pipe 196 is closed to the supply pipe 72 but the left end of the accumulator 194 is placed in communication with a pipe 200 by way of a pipe 202. The pipe 200, which includes a check valve 204, conducts pressure fluid to a station selector valve 206 which is common to both stations of the machine. If1the valve member 190 is moved downwardly by depression of the knob 32 at the same time that the valve member 190 is in its down position, pressure fluid flows into the right end of the accumulatorforcing the piston 198 to the left whereupon the pressure fluid in the left end of the accumulator is forced outwardly passing to the station selector valve 206. A pipe 208 connecting the valves 26,- 28 is always in communication with the supply pipe 72 and the pipe 208 is placed in communication with a pipev 210 leading to the right endof the accumulator with the valve member 190' in its lowermost position; The pressure fluid which is forced out of the accumulator by movement of the piston 198 toward the left is employed to actuate one of the pressure selector valves 110, 110' depending upon which of the treadles 24 or 24 has been previously actuated. For this reason it is necessary for the piston 198 to be in its right hand position at the beginning of a cycle of operation of the machine which can happen only if the valve member 190 is -in its upper position to admit pressure fluid into the left end of the accumulator and if the valve member 190 is in its upper position to permit exhaust of the pressure fluid from the right end of the accumulator through the pipe 210 and a pipe 212 leading tothe fluid reservoir. Consequently both valve members 190, 190' must be in their upper positions at the beginning of a cycle of operations and both must be depressed in order to cause movement of piston 198 toward the left forcing pressure fluid through the station selector valve 206 and into one or the other of the pressure selector valves 110, 110.

The station selector valve 206 includes a slide valve member 214 which is maintained either inthe left hand position illustrated or in a right hand position in the valve 206 by pressure fluid flowing through a pipe 216 or a pipe 216 connected tothe left and right ends ofthe valve 206 respectively. If the treadle 24 is depressed the pipe 216 is connected to the supply pipe 72 by way of pipe 184, valve 116 and pipe 186, causingmovement of the valve member 214 to. the right, whereupon the pipe 200 is connected through the station selector valve 206 to the pipe 138 communicating with the 'llPPfif end of the pressure selector valve 110 so thatthe pressure fluid forced from the left end of the accumulator will act upon the upper end of the valve member 130 of the pressure selector valve 110 moving this, valvemember downwardly against the action of spring 132. Th'efluid in the rightend of the station selector valve 206' is permitted to exhaust by way of pipe 216, valve 116 and pipe 188'.- connected to the fluid reservoir. v

In. the operation of the machine it will be assumed that a lasted shoe and 'outsole are placed on'the pad box 12 at the'left side of the machine, the pump 68 having been placed in operation. At this time pressure fluid flows from the pump through pipes 7'2, 158, 160, the timer control valve 112 and pipe 162 into the timing valve to move the valve member 150 to the left. Except for this movement. of the valve member 150 and .a similar movement of the valve member 150', and movements of valve members 82, of valves 76, 78, the parts will remain in the positions illustrated'until the operator stepson the. treadle 24. With the treadle depressed, pressure fluid will flow from the supply pipe 72 through pipe 184, valve'116, pipes 186 and 124 into the lower endzof the cylinder control valve 108 moving the valve member 117 upwardly, the upper end of the valve 108 being. connected at this time to the fluid reservoir by way of pipe 122, the timing valve 114 and the pipe 168. With the cylinder control valve member 117 in its upper position, the small cylinder 44 is connected through the reducing valve 74 to the supply pipe 72 as follows: From pipe 72 through pipe 80, reducing valve 74, pipe 134, valve 110, pipe .118, valve 108 and pipe. 46. Accordingly' the pistons 38, 44 and the pad box with the work thereon .are moved upwardly under light pressure to clamp the work between the pad box and the toe and done as soon as the work has been clamped between the pad box and the abutments, the operations of depressing the treadle 24 and'operating the buttons 30, 32 being completed in rapid succession. With the two valve-members 190, 190 moved into their lower posi tions pressure fluid flows through from the supply pipe 72.through pipe 208, valve 28 and pipe 210 into the right end of the accumulator 194 moving the piston-198 to the left and forcing the pressure fluid from the left end of the accumulator through pipe 202, valve 26, and pipe 200 into the station selector valve 206. The valve member 214 has previously been moved to the right when thetreadle 24 was depressed by pressure fluid flowing, from the supply pipe 72 through pipe 184, valve 116 and pipes186, .216. The pressure fluid nowflows from the station selector valve 206 through pipe 138 into the upper end ofthe valve to move the valve member downwardly against the actionof the spring 132. Flow of fluid from the reducing valve 74 through pipe 134 is now prevented by the valve member 130 and the supply pipe 72 is placed in communication with the small cylinder 44 by way of pipe 140, valve 110, pipe 118,- valve 108 and pipe 46 so that the pressure in the small cylinder increases to the extent permitted by the. pressure reducing valve 76. When the pressure of the fluid in the small cylinder reaches a predetermined value the valvemember60 is forced downwardly against the action of the spring 62 and pressure fluid now flows in the large cylinder 40 from the supply pipe '72 through pipe 86, the pressure regulating valve 76, pipes 88,

102,104 and 64, through port 66 and. passageway 54 so that pressure fluid under the control of the relief valve 78 acts upon the large cylinder 38 to apply the final pressure to the work.

When the valve member 60-is moved downwardly pressure fluid. also flows through-the pipe'174 into the left end of the valve 112'causing the valve member 170m move to the right thus interrupting flow of fluid from the pipe to the pipe 162 leading into the right end of the timing valve 114. The pipe 162 is now placed in communication with the pipe 178 leading to the fluid reservoir thereby permitting exhaust of pressure fluid fromthe right end of the timing valve 114 at a rate dependent upon the setting of the needle valve 180. This setting of the needle valve determines the length of. time that the work is maintained under. pressure becauseassoon as the-valve member 15005 the timing valve reaches the position illustrated under the force exerted by the spring 152 pressure fluid will flow from the supply pipe 72 through pipe 184, valve 116 (assuming the treadle has been released in the meantime) pipe 154, valve 114 and pipe 122 into the upper end of the cylinder control valve 108 forcing the valve member 117 downwardly thereby connecting the pipe 46 to the reservoir through pipe 120 so that the pressure of the fluid in the cylinder 44 drops whereupon the valve member 60 returns to its upper position cutting off the flow of fluid into the large cylinder 40 and conmeeting this cylinder to the fluid reservoir through the pipe 50.

If for any reason the operator does not wish to wait for the action of the timing valve to complete the pressing operation, as for example if the work has not been properly placed on the pad box, the pressure in the small cylinder 44 may be immediately reduced by actuation of the valve 34 through the knob 36. This permits flow of pressure fluid from the pipe 46 through a pipe 220 into the valve 34 and through a pipe 222 to the fluid reservoir whereupon the valve member 60 will be moved upwardly and the pressure fluid exhausted immediately from the large cylinder 40.

The valve members 190, 190' must be held downwardly for a suflicient period of time to move the piston 198 in the accumulator to the left and force the valve member 130 of the pressure selector valve 110 downwardly in order to obtain heavy pressure on the work. For this purpose provision is made to prevent too rapid return of the valve members 190, 190' in the event that the operator only momentarily presses upon the knobs 30, 32. The lower end of the valves 26, 28 are closed by valve members 226, 226 having a small port therethrough, the valve members being held against the lower ends of the valve chambers by springs 226, 228'. When the valve members 190, 190' are moved downwardly the pressure fluid in the lower ends of the valves 26, 28 act on the valve members 226, 226' to move them downwardly against the action of the springs 228, 228 permitting immediate exhaust of the fluid through pipes 230, 230 connected to the fluid reservoir. Immediately thereafter the valve members 226, 226 return to the positions illustrated but fluid must then pass through the small ports in the valve members 226, 226 into the lower ends of the valves 26, 28 thus providing a dashpot effect to retard upward movement of the valve members 190, 190.

It will be understood that the station on the right side of the machine may be operated while the work on the left side is held under pressure, it being unnecessary to wait for the completion of the pressing cycle in the left side of the machine. This operation is initiated by depressing the treadle 24' which causes movement of the valve member 214 of the station selector valve 206 to the left into the position illustrated and moves the valve member 117 upwardly so that the small cylinder 44 is connected through the reducing valve 74 to the supply pipe 72. Upon again depressing the knobs 30, 32 the valve member 130' of the pressure selector valve 110' is moved downwardly so that heavy pressure is exerted upon the small piston 44' following which the valve member 60 is forced downwardly and pressure fluid under the control of the relief valve 78 passes into the large cylinder 40. This side of the machine will then remain under pressure under the control of the timing valve 114 for a period dependent upon the setting of its needle valve.

Having thus described the invention what I claim as new and desire to secure by Letters Patent of the United States is:

1. In a machine for applying pressure to shoe bottoms, a pair of pressure applying stations, each of said stations comprising a pressure applying member, a fluid pressure operated motor for moving said pressure applying member to pressure applying position, a pump for supplying pressure fluid to the motors of both of said stations, control means associated with each station for directing pressure fluid from the pump to the motor of the associated station, mechanism associated with each motor for causing exhaust of pressure fluid from the associated motor automatically after the work in the station has been under pressure for a predetermined period of time, and operative connections between said motors, mechanisms, control means and pump whereby the two stations may be under pressure simultaneously and whereby the timing period of each station is independent of the other station.

2. In a machine for applying pressure to shoe bottoms, a pair of pressure applying stations, each of said stations comprising a pressure applying member, a fluid pressure operated motor for moving said pressure applying member to pressure applying position, a pump for supplying pressure fluid to the motors of both of said stations, control means associated with each station for directing pressure fluid from the pump to the motor of the associated station, mechanism associated with each motor for causing exhaust of pressure fluid from the associated motor automatically after the work in the station has been under pressure for a predetermined period of time, operative connections between said motors, mechanisms, control means and pump whereby the two stations may be under pressure simultaneously and whereby the timing period of each station is independent of the other station, and a manually operated control member common to both stations for causing exhaust of pressure fluid from both of said motors at a time prior to the expiration of said predetermined periods.

3. In a machine for applying pressure to shoe bottoms, a pair of pressure applying stations, each of said stations comprising a pressure applying member, a fluid pressure operated motor for moving said pressure applying member to pressure applying position, a pump for supplying pressure fluid to the motors of both of said stations, control means associated with each station for directing pressure fluid from the pump to the motor of the associated station, a timer associated with each motor, each of said timers including means to cause exhaust of pressure fluid from its motor automatically after the work in the station has been under pressure for a predetermined period of time, and fluid pressure connections between said motors, timers, control means and pump whereby the two stations may be under pressure simultaneously and whereby the timing period of each station is independent of the other station.

4. In a machine for applying pressure to shoe bottoms, a pair of pressure applying stations, each of said stations comprising a pressure applying member, a fluid pressure operated motor for moving said pressure applying member to pressure applying position, a pump for supplying pressure fluid to the motors of both of said stations, control means associated with each station for directing pressure fluid from the pump to the motor of the associated station, a timer associated with each motor, each of said timers including means to cause exhaust of pressure fluid from its motor automatically after the work in the station has been under pressure for a predetermined period of time, fluid pressure connections between said motors, timers, control means and pump whereby the two stations may be under pressure simultaneously and whereby the timing period of each station is independent of the other station, and a manually operated valve member common to both stations for causing exhaust of pressure fluid from both of said motors at a time prior to the expiration of the timing periods.

5. In a machine for applying pressure to shoe bottoms, a pressure applying member, a fluid pressure operated motor for moving said pressure applying member to pressure applying position, said motor comprising a small piston for moving said member rapidly into pressure applying position, a large piston for exerting heavy pressure on the work, a small cylinder and a large cylinder housing said small and large pistons respectively, a pump, a pressure responsive valve movable upon the admission of pressure fluid to one end thereof into a position in which pressure fluid from said pump flows to said small cylinder, operator-controlled means for directing pressure fluid from said pump to said one end of said pressure responsive valve, means operable upon the attainment of a predetermined high pressure in said small cylinder for directing pressure fluid from said pump to said large cylinder and timing means arranged to cause the flow of pressure fluid from said pump to the other end of said pressure responsive valve after the work has been under pressure for a predetermined time to move said pressure responsive valve to its original position in which the fluid in said cylinders is permitted to exhaust.

6. In a machine for applying pressure to shoe bottoms, a pressure applying member, a fluid pressure operated motor for moving said pressure applying member to pressure applying position, said motor comprising a small piston for moving said membenrapidly into'pres'sure applying position, a largepiston for-exertingheavy-pressure on the work, a small cylinder and a largecylinder housing said small and large pistons respectively," a pump, a pressure responsive valve movable upon the admission of pressure fluid to one'en'd'thereof into a position in which pressure fluid from said pump flows to saidsrnall cylinder, operator-controlled means fordirecting pressure fluid from said pump to said one end of said pressure responsive valve, means operable upon the attainment of a predetermined high pressure in said small cylinder for directingpressure fluid from said pump to said large cylinder, timing means-arranged to cause the "flow of pressure fluid fromsaid pump to the other end of said pressure responsive valve after the work has been under pressure for a predetermined time to movesaid pressure responsive valve to its original position inwhich the fluid in said cylinders is permitted to exhaust, and an operator-controlled valve forexhausting thefluid' from said small and large cylinders-prior'to the elapse of said predetermined time.

7. In a machine for applying pressure to shoe bottoms, a pressure applying member, a fluid pressure operated motor for moving said pressure applying member to pressure applying position, saidmotor comprising a 'sma'll piston for moving said member rapidly in to=pressure applying position, a large piston for exerting: heavy pressure on the work, a small cylinder and a large cylinder housing said small and large'pistons respectively, a pump,

an operator-controlled valve for directing-fluid under low pressure from said pump to said small cylinder, a pair of serially connected spaced manually-operated valves for directing fluid under high pressure from said pump tosaid small cylinder,v means responsive to the attainmentof a predetermined pressure in the-small cylinder for directing fluid under high pressure from said pumpto said large cylinder, and timinglmeans arranged to cause the exhaust of the pressure fluidfrom said small and large cylinders after the work has .been under pressure for a predetermined time. t

8. In a machinefor a plyingpressure to shoe bottoms, a pressure applying member, a 'fluid pressure operated motor for moving said pressure ap'plyin'gmember to pressure applying position, said motor comprising='a small piston for moving said member rapidly into pressure applying position, a large piston for exerting heavy pressure on the work, a small cylinder and a large cylinder housing said small and large pistons respectively, a pump, a pressure responsive valve movable upon the admission of pressure fluid to one end thereof into a position in which pressure fluid from said pump flows to said small cylinder under low pressure, operator-controlled means for directing pressure fluid from said pump to said one end of said pressure responsive valve, a pair of serially connected spaced manually-operable valves for directing fluid under high pressure from said pump to said small cylinder by way of said pressure responsive valve, means operable upon the attainment of a predetermined high pressure in said small cylinder for directing pressure fluid from said pump to said large cylinder, and timing means arranged to cause the flow of pressure fluid from said pump to the other end of said pressure responsive valve after the work has been under pressure for a predetermined time to return the valve to its original position in which the fluid in said cylinders is permitted to exhaust.

9. In a machine for applying pressure to shoe bottoms, a pressure applying member, a fluid pressure operated motor for moving said pressure applying member to pressure applying position, said motor comprising a small piston for moving said member rapidly into pressure applying position, a large piston for exerting heavy pressure on the work, a small cylinder and a large cylinder housing said small and large pistons respectively, a pump, a pressure responsive valve movable upon the admission of pressure fluid to one end thereof into a position in which pressure fluid from said pump flows to said small cylinder under low pressure, operator-controlled means for directing pressure fluid from said pump to said one end of said pressure responsive valve, a pair of serially connected spaced manually-operable valves for directing fluid under high pressure from said pump to said small cylinder by way of said pressure responsive valve, means operable upon the attainment of a predetermined high pressure in said small cylinder for directing pressure fluid mined time to return the valve to its original position in which the fluid in said cylinders is permitted to exhaust,

and an operator-controlled valve for exhausting the pressure fluid from said cylinders prior to the elapse of said predetermined time.

10. In a machine for applying pressure to shoe bottoms, a pair of pressure applying stations, each of said stations comprising a pressure applying member movable upwardly to apply pressure to' a work piece, a fluid pressure operated motor for thus moving said member, a pump, a control valve movable by the operator to direct fluid under low pressure from said pump to the fluid pressure operated motor, a pair of serially connected manuallyoperated valves common to the two stations of the machine, and means operable in response to simultaneous operation of said last-named valves to direct fluid under igh pressure from the pump to that motor to which fluid under low pressure has been directed.

11. Ina machine for. applying pressure to shoe bottoms, a pair of pressure applying'stations, each of said stations comprising a pressure applying member movable upwardly to apply pressure to a work piece a pump, a fluid pressure operated motor for thus moving said member, a control valve movable by the operator to direct fluid under low pressure from said pump to the fluid pressure operated motor, a pair of serially connected manually operated valves common to the two stations of themachine, means operable in-response to simultaneous operation of said last-named valves to direct fluid under high pressure from the pump to that motor to which fluid under low pressure has been directed, and timing means for causing exhaust: of the pressure fluid from the motor after the work hasbeen" under pressure for a predetermined length of time.

12. A two-station'shoe bottom pressing machine comprising a pair'ofindividually operated pressing members, a fluid press'ure operated motor for each of said members, apump, an operator-controlled valve for each motor for supplyingfluid under low pressure thereto from said pump, a fluidpressuie operated valve associated-with each motor and arranged in response to the application of fluid pressure thereto to direct fluid under high pressure from said pump to the associated motor, operatorcontrolled valve members common to the two stations of the machine and arranged to supply pressure fluid to one or the other of said fluid pressure operated valves, and means controlled by the first-named operatorcontrolled valves for determining to which of the fluid pressure operated valves the pressure fluid is directed upon operation of the operator-controlled valve members.

13. A two-station shoe bottom pressing machine comprising a pair of individually operated pressing members, a fluid pressure operated motor for each of said members, a pump, an operator-controlled valve for each motor for supplying fluid under low pressure thereto from said pump, a fluid pressure operated valve associated with each motor and arranged in response to the application of fluid pressure thereto to direct fluid under high pressure from said pump to the associated motor, operator-controlled valve members common to the two stations of the machine and arranged to supply pressure fluid to one or the other of said fluid pressure operated valves, means controlled by the first-named operator-controlled valves for determining to which of the fluid pressure operated valves the pressure fluid is directed upon operation of the operator-controlled valve members, said operator-controlled valve members comprising a pair of serially connected spaced manually-operated valves.

14. A two-station shoe bottom pressing machine comprising a pair of individually operated pressing members, a fluid pressure operated motor for each of said members, a pump, an operator-controlled valve for each motor for supplying fluid under low pressure thereto from said pump, a fluid pressure operated valve associated with each motor and arranged in response to the application of fluid pressure thereto to direct fluid under high pressure from said pump to the associated motor, operatorcontrolled valve members common to the two stations of the machine and arranged to supply pressure fluid to one or the other of said fluid pressure operated valves, a station selector valve positioned by pressure fluid from said pump for determining to which of the fluid pressure operated valves the pressure fluid is directed upon operation of the operator-controlled valve members, and fluid pressure connections between said station selector valve and the first-named operator-controlled valves whereby the station selector valve is positioned in accordance with which of the first-named operator-controlled valves is actuated.

15. A two-station shoe bottom pressing machine comprising a pair of individually operated pressing members, a fluid pressure motor for each of said members, a pump, an operator-controlled valve for each motor for supplying fluid under low pressure thereto from said pump, a fluid pressure operated valve associated with each motor and arranged in response to the application of pressure thereto to direct fluid under high pressure from said pump to the associated motor, operator-controlled valve means common to the two stations of the machine, said valve means comprising a pair of serially connected spaced manually-operated valves arranged upon simultaneous actuation thereof to supply pressure fluid to one or the other of said fluid pressure operated valves, a station selector valve positioned by pressure fluid from said pump to determine to which of the fluid pressure operated valves the pressure fluid is directed upon operation of said serially connected valves, and fluid pressure connections between said station selector valve and the first-named operator-controlled valves whereby the station selector valve is positioned in accordance with which of the first-named operator-controlled valves is actuated.

16. A two-station shoe bottom pressing machine comprising a pair of individually operated pressing members, a fluid pressure operated motor for each of said members, a pump, an operator-controlled valve for each motor for supplying fluid under low pressure thereto from said pump, a fluid pressure operated valve associated with each motor and arranged in response to the application of fluid pressure thereto to direct fluid under high pressure from said pump to the associated motor, operatorcontrolled valve members common to the two stations of the machine and arranged to supply pressure fluid to one or the other of said fluid pressure operated valves, means controlled by the first-named operator-controlled valves for determining to which of the fluid pressure operated 12 valves the pressure fluid is directed upon operation of the operator-controlled valve members, and timing means for causing exhaust of pressure fluid from said motor after the work has been under pressure for a predetermined time.

17. A two-station shoe bottom pressing machine comprising a pair of individually operated pressing members, a fluid pressure operated motor for each of said members, a pump, an operator-controlled valve for each motor for supplying fluid under low pressure thereto from said pump, a fluid pressure operated valve associated with each motor and arranged in response to the application of fluid pressure thereto to direct fluid under high pressure from said pump to the associated motor, operator-controlled valve members common to the two stations of the machine and arranged to supply pressure fluid to one or the other of said fluid pressure operated valves, means controlled by the first-named operator-controlled valves for determining to which of the fluid pressure operated valves the pressure fluid is directed upon operation of the operator-controlled valve members, timing means for causing exhaust of pressure fluid from said motor after the work has been under pressure for a predetermined time, and a manually operable valve common to the two stations of the machine for exhausting pressure fluid from the fluid pressure operated motors immediately upon actuation of said valve.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,776,679 Carroll Sept. 23, 1930 1,851,484 Bausman Mar. 29, 1932 1,899,678 Ernst et a1. Feb. 28, 1933 2,035,791 Davis Mar. 31, 1936 2,115,414 Davis Apr. 26, 1938 2,459,845 Seely et al Jan. 25, 1949 2,465,758 Sedgwick et a1. Mar. 29, 1949 FOREIGN PATENTS Number Country Date 87 Great Britain of 1863 of 1863

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