US2134726A

US2134726A - Machine for applying pressure to shoe bottoms

Info

Publication number: US2134726A
Application number: US144005A
Authority: US
Inventors: Vernon H Meyer
Original assignee: United Shoe Machinery Corp
Current assignee: United Shoe Machinery Corp
Priority date: 1937-05-21
Filing date: 1937-05-21
Publication date: 1938-11-01
Anticipated expiration: 1955-11-01

Description

Nov. 1, 1 938.

V. H. MEYER I Filed May 21, 1937 3 Sheets-Sheet l MACHINE FOR APPLYING PRESSURE TO SHOE BOTTOMS Nov. 1, 1938. v H. MEYER 2,134,726

MACHINE FOR APPLYING PRESSURE TO SHOE BOTTOMS Filed May 21, 1937 3 Sheets-Sheet 2 Fig.2.

Nov. 1, 1938. v. H. MEYER 2,134,726

MACHINE FOR APPLYING PRESSURE TO SHOE BOTTOMS Patented Nov. 1,1938

UFNITED STATES P A TE- T QFFI Q E Vernon H; Meyer, Beverly, Mass, assignor to United Shoe Machinery Gorporation, Paterson, N. J., a corporation of New Jersey Application May 21,1937, Serial No; 144,005

The invention relates to cement. sole. attaching:

and sole. laying machines of the type inwhich pressure is applied to the shoe andi sole: by. hy-

draulic means operated; for'example, byoil under" pressure.

The invention is illustrated as embo'diedi in a machine of the type disclosed in Letters Patent ofthe United States No.v 2,047,185 grantedv July. 14, 1936; upon application of Bal1ardiet al;,.whichr discloses a machine for" cement attaching soles".

to. shoes comprising a plurality of. pads which. are:

20. station should be maintained until the shoe: to:

which pressure has been applied: has& passed around the machine and hasarrived. at the station next to the operating station: where the: pressure is relieved. Under some circumstances, due sometimes toslight leakage inz'theivalvesan'd other mechanism by which the liquid is held under pressure and sometimes to compression of the work in response to the heavy pressure to which it is subjected, the pressure on. the

liquid and hence onthe shoe may drop progressively so that a: substantial drop in the: pressure has occurred beforetheshoe arrives at the station where the" pressure is'to be relieved.

Objects of this invention are to restore the pressure onthe shoes" already in the machine when. pressureis. applied. to the shoeat the operating station but to avoid application of additional pressure to a shoe if the pressure thereon has been relieved or has: dropped below a. predetermined pressure; Accordingly, in the illustrated machine a pipe lineleads: from the source of hydraulic pressure; for example oil under pressure; to each oi the cylinders by operation of the pistons in which pressure is' applied: to the shoe. Each of thcse'pipe-lines has. a. valve: mechanism which will" permit oil to pass: from.

the source of: supply to a' cylinder as long as the the source of oil pressure to each of the cylinders, as fully disclosed in the above-mentioned patent, which pipes are provided with three-position valves by whichadmission of" pressure into each cylinder, its maintenance therein and its exhaustion therefrom are controlled.

If one ormoreof the pads for any reason is not being used whilethe others are' in use, it has beenfound that sometimes, due probably to leakage of the three-way valves pressure will gradually build up in the idle cylinder and may cause injury to the machine. Accordingly, the invention consists further in the provision of a drain which prevents the building up of pressure inian idle cylinder, the drain opening being automatically closed when pressure is applied to the cylinder. As illustrated; the valve mechanism comprises a. plunger acting against a spring to close. the'drain; opening and at the same time to open a passage leading: from the source of oil' supply; The. plunger is operated against its spring by the building up of pressure in the cylinder, the. rush of oil from the cylinder causing the plunger to be operated against its spring, thus-opening an inlet from the source of supply; This condition is maintained, permitting oil from the: general source of supply to pass under pressure to the cylinder to restore pressure therein as' long as nearly the initial pressure is maintained therein. When a cylinder isexhausted or the pressure therein in any way greatly reduced, the spring reacts, opening the drain and" closing the passage from the source of supply so that pressure will not be admitted to the exhaust cylinder, but any oil accidentally entering thecylinder may pass out through the drain.

In the drawings- Fig. 1- is a planview showing three of the eight cylinders. of a sole-attaching machine of the type illustrated in said Ballard et al. patent with additional pipe lines leading from the source of pressure supply to all of the cylinders;

Fig. 2 is a front elevation of the machine. of Fig. 1 showing particularly the arrangement of the pressure-applying mechanism;

Fig. 3 is a view in side. elevation of. one of the cylinders of themachine and thepressure-apply-- ing mechanism associated therewith, with the. pressure-restoring mechanism ofthe present invention connected'tothe cylinder; and

Figs. 4 and 5. are sectional views of the pressure restoring valve mechanism, Fig. 4 showing the parts in the positions they assume when the cylinders are exhausted and Fig. 5 showing. the

parts in the positions they assume when the cylinder is under pressure.

In the drawings, my novel mechanism for restoring pressure in the cylinders which are applying pressure to the work when pressure is being applied to the cylinder at the operating station is disclosed as embodied in a machine of the type fully disclosed in the above-mentioned patent. The drawings of this application show only those parts of the machine with which my invention is concerned and for an explanation of parts of the machine not herein fully described reference may be had to the above-mentioned patent. 1

In the drawings, the numeral I0 (Figs. land 2) indicates a turret carrying the pad boxes and arranged for rotation about a vertical axis on a column I2. At each station there is a cylinder I4 (Fig. 4) containing a piston I6 upward movement of which, due to oil or other liquid under pressure admitted through a pipe I8, acts through levers 20, 22 (Fig. 3) pivoted at 24 to apply downward pressure to a shoe A located on a pad 26.

' .The oil pressure is produced by a continuously running pump 36 (Fig. 2) which draws oil through a pipe 32 from a tank 34 and delivers it through a pipe 36 to the central portion of the turret I0 (Fig. 1) where it is distributed through four pipes 38 to the eight cylinders, each pipe 38 having two

branches

40, 42, one going to a three-position valve 44 of one cylinder and the other to the three-position valve 44 of the cylinder next to it. The three-position valve 44 r. (Fig. 2) may be operated by a handle 48 which,

when moved to the right, allows the pressure liquid to pass through the pipe I8 to the cylinder I4, when in its central position holds the pressure in the cylinder, and when moved to the left permits the pressure liquid in the cylinder to be exhausted through a pipe 50 into the column I2 from which it is returned to the tank 34 by a pipe 52. The pipe 32 is connected to the pipe 36 by a by-pass pipe 54 in which is a pressureinducing valve 56. When the valve 56 is opened the pump 30 circulates liquid idly through the by-pass 54 but when the valve 56 is closed pressure is built up in the pipe 36 and in the

connections

38, 40, 42 to each of the cylinders. The

pyalve 56 is closed by depression of a treadle 58 having a treadle rod 60 which has operating connections at 62 with the valve 56 so that depression of the treadle will close the valve 56 and cause pressure to be built up in the system. The

c rod 60 also carries a head 64 connected toa lever 66 fulcrumed at 68 on the machine frame. The lever 66 carries a roll I0 which engages an arm I2 of a three-armed lever. Another arm I4 of the lever carries a roll I6 which engages the top of the head 64. The three-armed lever is fulcrumed at I8 on the turret and its third arm 80 is connected by a link 82 to the handle 48 of the three-position valve 44. It will be seen that when the head 64 moves down by depression of the treadle 58 the roll I8 on the lever 66 will move upwardly against the arm 12 of the three-armed lever, causing it to rotate in a clockwise direction to pull on the link 82, thus opening the threeposition valve to admit pressure to the cylinder at the operating station.

One arm 84 of an angle lever pivoted at 86 to the frame lies under the roll 16 of the threearmed lever located at the station next to the operating station. A depending arm 88 integral -with the arm 84 carries a roll engaging a cam slot 90 in a member 92 adjustably secured to the lever 66, the slot 90 being so formed that when the member 92 moves upwardly in-response to depression of the treadle the slot 90 will turn the

angle lever

84, 88 in a clockwise direction about its fulcrum 86, the arm 84 engaging the roll 16 of the three-armed lever at the next station to the operating station and rotating the lever in a counterclockwise direction to move the threeposition valve at that station into position to exhaust the pressure fluid from its cylinder.

Back of each cylinder I4 and connected thereto by a U-shaped pipe 94 is a pressure-restoring valve mechanism 96 which consists, as shown in Figs. 4 and 5, of a rectangular block in which are mounted a ball check valve 98, the ball of which is held to its seat by a light spring I0, and a plunger valve I02 the lower end I03 of which is conical. When the plunger moves downwardly, the conical end closes an opening into a drain tube I04. The plunger I02 is normally held raised by a spring I06, as shown in Fig. 4, in which position a sleeve I08 mounted on the plunger between its head II 0 and the spring I06 closes a passage I I2 leading to the ball valve 98. When the plunger I02 is depressed as shown in Fig. 5, the sleeve I08 descends below the passage II2, leaving a passage open therefrom to the pipe 94. On the plunger I02 above the head H0 is a flange II4 which limits upward movement of the plunger I08, and the sides of the flange H4 and the head IIO are slabbed off to permit passage of fluid from the passage II2 to the pipe 94 when the sleeve I08 is depressed and to permit drainage from the pipe 94 through the sleeve I08 and out through the drain tube I04 when the plunger I02 is raised. Leading from the ball check valve I00 is a pipe I I6 which is connected, as shown in Fig. 1, to the source of pressure supply. That is, the rear end of the pipe H6 is connected to a hollow plug II 8 which is threaded into a hole in the head In of the turret to which pressure is supplied by the pump 30. It will be noted that four of the pressurerestoring devices 96 have their pipes II 6 connected to one plug I I8 and that on the other side of the turret is another plug I I8 to which the other four pressure-restoring devices are connected.

Supposing pressure is being applied to a cylinder I4 at the operating station, the pressure fluid being admitted by the three-position valve 44 through the pipe I8 to the cylinder and passing through the pipe 94 of the pressure-restoring devices, the rush of oil through the pipe 94 forces the plunger I02 down against its spring I06 and seats the conical end I03 in the passage into the drain pipe I04, the plunger remaining in this position (Fig. 5) so long as the high initial pressure in the cylinder, which may be over- 400 pounds per square inch, does not drop below a predetermined pressure which may be as low as 50 pounds. When the cylinder I4 just filled has moved away from the operating station and. another cylinder is having pressure applied thereto, the same pressure will be conducted by the pipe II6 through the check valve 98 to the pipe 94 and, if the pressure has dropped, it will be restored. When the cylinder reaches the eighth station, that is, the one next to the operating station, the three-position valve ofthat cylinder will be moved to the exhaust position and the pressure will drop in that cylinder below say fifty pounds, whereupon the plunger I02 of the pressure-restoring mechanism 96 connected with that cylinder will be relieved of the pressure upon it sufliciently to be raised by its spring I96, opening the drain tube Hi4 and raising the sleeve N38 to close the passage H2 and prevent any substantial flow of pressure fluid through the passage H2 into that cylinder while it remains exhausted.

Should one of the cylinders remain in disuse for any reason, the pressure-restoring mechanism would remain in the position shown in Fig. i and it would be impossible for pressure to build up in that cylinder because any seepage of the pressure liquid around the sleeve it would pass downwardly through the open drain tube I04, and any seepage of pressure fluid through the three-position valve and into the cylinder could pass out through the pipe 94 into the drain I04 without producing any lifting of the idle piston [6.

Having thus described my 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, the combination with a plurality of cylinders and pistons operated in turn by liquid under pressure to apply pressure to shoe bottoms, of a drain tube for each cylinder, an auxiliary pressure supply pipe to each cylinder, means operated by the pressure in each cylinder to close the drain tube and open the auxiliary pipe, and means operating when the pressure in the cylinder is relieved for opening the drain tube and closing the auxiliary pipe.

2. In a machine for applying pressure to shoe bottoms, the combination with a plurality of cylinders and pistons operated by liquid under pressure, of a drain tube from each cylinder, an auxiliary supply pipe to each cylinder, and means operated by pressure in each cylinder to close the drain tube and open the auxiliary pipe.

3. A pressure-restoring device for hydraulic cylinders comprising a pipe leading from a cylinder, a drain tube connected therewith, a pressure-supply pipe connected to both the cylinder pipe and the drain tube, a sliding sleeve arranged to close the supply pipe opening while permitting communication from the cylinder pipe to the drain tube, a plunger passing loosely through the sleeve and having an end formed and arranged to close the drain tube opening, and a spring arranged to maintain the sleeve in position to close the pressure supply pipe and to hold the plunger in position to maintain the drain tube open, the rush of pressure fluid from the cylinder acting to move the sleeve and plunger against the spring causing the sleeve to open the supply pipe and the plunger to close the drain tube.

4. A pressure-restoring device for hydraulic cylinders comprising a pipe leading from a cylinder, a drain tube connected therewith, a pressure supply pipe connected to both the cylinder pipe and the drain tube, a check valve in the supply pipe permitting passage of liquid to the cylinder pipe, a sliding sleeve arranged to close the supply pipe opening while permitting communication from the cylinder pipe to the drain tube, a plunger passing loosely through the sleeve and having a head engaging the sleeve and an end formed and arranged to close the drain tube opening, and a spring arranged to maintain the sleeve in a position to close the supply pipe and to hold the plunger away from the drain tube opening, the construction being such that a rush of pressure liquid from the cylinder will act to move the sleeve and plunger against the spring and cause the sleeve to open the supply pipe and the plunger to close the drain pipe.

5. A machine for applying pressure to shoe bottoms comprising a plurality of pads arranged upon a carrier movable to present the pads in turn at an operating station, means pressing each shoe on its pad comprising a cylinder and piston operated by liquid under pressure, means at the operating station to cause pressure to be applied to the cylinder at that station and to be exhausted from the cylinder at the next station thereto, and a device piped to each cylinder and having an auxiliary pressure supply pipe, a drain tube and a plunger operated by the pressure in the cylinder to close the drain tube and to open the auxiliary pipe whereby when pressure is applied to any cylinder the other cylinders under pressure will receive liquid through the auxiliary supply pressure pipe if the pressure therein has fallen and when a cylinder has been exhausted the auxiliary pipe will be closed and the drain tube opened.

6. A machine for applying pressure to shoe bottoms comprising a plurality of pads arranged upon a carrier movable to present the pads in turn at an operating station, means for pressing each shoe on its pad comprising a cylinder and piston operated by liquid under pressure, means at the operating station-to cause pressure to be applied to the cylinder at that station and to be relieved from the cylinder at the next station thereto, a valve mechanism piped to each cylinder and having a liquid pressure supply pipe, a drainage tube, and a spring-sustained sliding valve normally closing the pressure supply pipe and opening the drain tube, said valve being operated against its spring by the cylinder pressure to closethe drain tube and open the supply pipe whereby when pressure is applied to any cylinder the other cylinders under pressure will receive an auxiliary supply of pressure liquid through the supply pipes and when a cylinder has been exhausted its supply pipe will be closed and its drain pipe opened.

7. A machine for applying pressure to shoe bottoms having, in combination, a plurality of pads arranged upon a carrier movable to present the pads in turn at an operating station, means for pressing each shoe on its pad comprising a cylinder, a piston operated by liquid under pressure, means at the operating station to cause pressure to be applied to the cylinder at that station and to be exhausted from the cylinder next to come to that station and auxiliary means connected to each cylinder comprising a pressure supply pipe, a drain tube and means operated by the cylinder pressure for closing the drain tube and opening the pressure supply pipe whereby when pressure is applied to any cylinder any of the other cylinders which are under approximately their initial pressure will have the initial pressure restored and when pressure on any cylinder has been relieved that cylinder will receive no pressure and the drain tube will be opened to carry away any liquid entering the cylinder by reason of leakage or seepage.

VERNON H. MEYER.