US2250715A - Garment-pressing machine - Google Patents

Description

y 1941- w. N. LAUER ETAL 2,250,715

GARMENT PRESSING MACHINE I Filed Sept. 10, 1958 s Sheets-Sheet 1 ATTORNEYS July 29, 1941. w. N. LAUER ET-AL 2,250,715.

GARMENT PRESS-ING MACHINE Filed Sept. 10, 1938 6 Sheets-Sheet 2 ATTORNEYS Jul 29, 1941.

w. N. LAUER ETAL GARMENT PRESSING MACHINE Filed Sept. 10, 1938 6 Sheets-Sheet 3 ATTORNEYS July 29, 1941. w. N. LAUER ETAL 2,250,715

GARMENT PRESSING MACHINE "Filed Sept. 10, 1938 6 Sheets-Sheet 4 37 mum- INVENTOR5- M \Qm N- Lauer BY wah'u' A. H k. I

/ {0c/l( d ATTORNEY 5 July 29, 1941. w. N. LAUER ETAL GARMENT PRESSING MACHINE Filed Sept. 10, 1938 6 Sheets-Sheet 5 z W I W 1 ATTORNEYS Patented July 29, 1941 GARMENT -PRESS]NG MACHINE William N. Lauer and Walter A. Hoch, Forest Hills, N. Y., assignors to New York Pressing Iron 00. Inc., New York, N. Y., a corporation of New York Application September 10, 1938, Serial No. 229,234

8 Claims.

This invention relates to a new and improved garment-pressing machine.

One of the objects of the invention is to 'provide simple and efficient mechanism whereby the machine can be operated by fluid pressure, such as air pressure or the like. 1

Another object of the inventionis to provide a machine having a manual control for admitting air under pressure to an operating cylinder, and to provide additional automatic means whereby air under pressure will be supplied to the operating cylinder after the manual control means have been released. 7 7

Another object of the invention is to provide improved means for controlling the exhaust of the power cylinder.

Another object of the invention is to provide improved means for applying the force which is produced by the power cylinder. Numerous additional objects of the invention will be stated in the annexed description and drawings which illustrate a preferred embodiment thereof, it being understood that the above statement of the objects of our invention is intended generally to explain the same without limiting it in any manner.

Fig. 1 is a side elevation showing the machine in the closed position with the pressing-head abutting the buck of the machine.

Fig. 2 is a view similar to Fig. 1, showing the machine in the open position.

Fig. 3 is a rear end elevation of the machine.

Fig. 4 is a partial front elevation of the machine.

Fig. 5 is a section, partially in elevation, on the line 5-5 of Fig. 4.

Fig. 6 is a sectional View, partially in elevation, on the line 66 ofFig. 1.

Fig. 7 is a section on the line 1-1 of Fig. 6.

Fig. 8 is a section on the line 88 of Fig. 7.

Fig. 9 is a diagrammatic view illustrating the control mechanism for the embodiment shown in Figs. 1-8.

Fig. 10 is a View similar to Fig. 9, showing a control for operating a plurality of pressing machines.

The machine comprises a frame I, to which a sub-frame 2 is connected. A power cylinder 3 is connected to the sub-frame 2. Asshown in Fig. 7, a piston 4 is located in power cylinder 3. The power cylinder 3 is provided with an inlet 1 for admitting air or other fluid under pressure. Said cylinder 3 is also provided with an outlet nipple 9 having radial bores I0, which are controlled by means of an adjustable threaded valve ll, so as to regulate the rate at which the air can escape through the bores I0 of the outlet nipple 9, when the piston 4 is moved outwardly on its power stroke.

As shown in Fig. 7, the piston 4 has the usual piston rod 5. Said rod 5 has a slide 12, which is slidably guided in recesses of a hollow guide member l4, which is connected to the sub-frame 2 by means of screws l5. The piston rod 5 is pivotally connected at 5a to a first knee-lever It, which is pivotally connected at I! to a lever 44 and which is also pivotally connected at l8-to a second knee-lever l9. Said second knee-lever I9 is pivotally connected at 2| and at 23 to the toggle- levers 20 and 22. The toggle-lever 22 is pivotally connected at 22a to the frame I. The toggle-lever 20 is pivotally connected at 24 to the arm 25 of the pressing-head 33. Said arm 25 is pivotally connected at 26 to the frame 'I. In order to identify these parts for the purposes of the claims, the lever I6 may be designated as a first lever, which is pivotally connected at the first pivot point I! to thesecond lever 44, which is pivotally connected tothe frame at 45, at a point which is spaced from the first pivot point ll. The lever l9 may be designated as a third lever, which is respectively connected at the third pivot point 2| to the first toggle-lever 20, and which is connected at the fourth pivotpoint 23 to the second toggle-lever'22. The first toggle lever 20 is pivotally connected at 24 to the pivoted arm 25 of the pressing head 33, at a point which 'is spaced from the pivot 26. The distance between the first and second pivot points I! and I8 is less than the distance between the second pivot point l8 and the point Sat, at which the piston rod is connected to the first lever 16. When the machine is fully opened, as illustrated in Fig. 2, the extension of the axis of the piston rod 5 is intermediate the first and second pivot points I! and I8. When the machine is fully closed, as illustrated in Fig. 1, said first and second pivot points I! and I8 are on the same side of the extension of said aXis of the piston rod 5.

Auxiliary means are provided for regulating the position of the head 33 relative to the buck 29. These auxiliary mean include an additional arm 28 and a regulating wheel 21. Said additional regulating means are well known per se and they are therefore not described in detail. A tension spring 34 is connected to the toggle-arm '20 at 35, and also to a yoke 36 which is connected to the frame I. Said tension spring 34 therefore normally holds the pants in the open position which is shown in Fig. 2 p

Tension springs 56 are connected to the pivot pin 50. and said springs 56 are also connected to lugs which are connected to the head of the stationary cylinder 3, so that said tension springs 56 normally hold the piston rod in the position shown in Fig. 2.

Steam inlet-pipes 3i and 32 are connected to a suitable source of steam under pressure. The steam inlet-pipes 32 are connected to the buck 29, and the steam inlet-pipes 3| are connected by flexible pipes to the pressing-head. This part of the machine is well known per se. The machine is also provided with a conventional table T and with a conventional shock absorber 'S which has a movable plunger Sa which is moved inwardly by the arm 25, when the machine is opened. The air inlet-pipe 31 is connected to any suitable source of compressed, air (not shown).

As shown in Fig. 9, the air inlet-pipe provided with control valves 52 and 53, having manually-operated plungers 53a and 52a, The heads or buttons of these plungers arelo'eated above the .table T. It is therefore necessary for the operator to place both hands upon the buttons of the plungers 53 a,and 5. .1 and to press said plungers downwardly, in order to allow air to pass from the air intake-pipe or inlet-pipe 31 through pipe-line 39 to pipe 38. The pipe 38 is connected to the inlet nipple l of the cylinder 3, sothat the compressed air will force the piston 4 outwardly on its power stroke. Thepipe 38 is also connected to a branch pipe 40, which is connected to the air intake-pipe 31 by means of a coupling 46a.

The pipe is a by-pass pipe, which is con trolled by an automatically operated by-pass valve 42. As shown in Fig. 2 for example, the plunger of the by-pass valve .42 is operated by lever 60 so as to open said valve 42. Lever 60 is pivoted to the frame I, at BI. This lever 60 has a bntton 62. A cam member 43 is rigidly connectedto the lever 44, which is pivotally connected at to the 'frame oi the machine. When, the lever 44 is operated, as will be later more fully described,

cam member 43 bears against the button 62 so as to operate lever 60 and to open the by-pass valve 42.

Thepipe 38 is connected toanother branch pipe 4|, which is provided with an exhaust outlet, controlled by means of an. exhaust valve 54, The exhaust valve 54 has a plunger 542) which is. moved inwardly so as te open said exhaust valve. 54. The plunger 54b is aligned with the plunger 540 of a pilot valve 54a. This pilot valve 54a is connected through a valve 64 to the pipe 31, by means of a coupling 65. The valve 64 has a plunger which is moved inwardly by means of a lever 55, in order to open said valve 64, thus admitting air under pressureto the pilot'valve 54a and outwardly moving its plunger 540 to actuate the plunger 54band thus to open the exhaust valve 54. The pilot valve is of a conventional and well known type, so that when it is actuated, it will hold the exhaust valve 54 open for a suitable period, as from two seconds to four seconds, At the end of this period the plunger 540 of the pilot valve will move inward- 1y, thus permitting the exhaust valve 54 to close. This detailandother details of the valves are not. disclosed, since the valves are well known per. se'. 1 V

. The lever is actuated manually, in orderto cause the exhaust valve to ,open, and thus to open the machine.

The operation of the device is as follows:

The operator places a garment on the buck 29 and then depresses the plungers 52a and 53a so as to connect the air intake-pipe 31 to pipe 39 and pipe 38. The compressed air then forces the piston 4 and its rod 5 outwardly, against the force of the springs 56. The member 16 is thus moved outwardly, and it is also turned counterclockwise, referring to Figs. 1 and 2. The member 19 is also actuated so as to close the toggle and to depress the head 33, against the force of the tension spring 34. Figs. 1 and 2 are substantially according to scale and it is clear that the members I6, 44, and the members I9, 20 and 22 are in the position to apply maximum pressure to the head 23 and against the buck 29, when the piston 4 is at the end of its power stroke.

The lever 44 is thus turned counterclockwise from the position shown in Fig. 2, to the position shown in Fig. 1, so that its cam extension 43 will open the by-pass valve 42. When the machine is in the open position shown in Fig. 2, the valves 52, 53, 64, 42 54' are closed. When the pressing-head 33 is in or close to-the closed position shown in Fig. 1, or when it has moved a predetermined distance towards buck 29; the cam extension 43 opens the by-pass valve 42. Hence, it is not necessary. for the operator to hold down the plungers 52a and 53a, during the entire period of time in which the garment is being pressed. As soon as the pressing-head is in the position shown in Fig. 1, orcloseto said position, the operator can release the plungers 52a and 53a, because the cam member43 will then have opened the by-pass valve 42, so that compressed air will pass through the coupling- 46a and the pipe 40 and the open-valve 42, to-the pipe 38. The flow of air out of the front end of the cylinder is regulated by means of the adjustable valve ll, so that the speed 0t movement of the machine as it moves to'its closing position is controlled, thus preventing sudden shocks.

The pressing-head 33 will therefore be held under suitable pressure in the operativeposition, until the operator manually actuates the exhaustlever 55-. When the exhaust lever 55 is operated, compressed air is admitted through the coupling 65 and the pipe 4! and the valve (which has been opened by actuating the lever 55) to the pilot valve 54a. Its plunger 540 will move outwardly so as to actuate the plunger 54b and'to open the exhaust valve and-tohold it open for a predetermined period. When the exhaust valve 54 is opened, the by-pass valve 42 is still open. However, the valves 42 and 54 are regulated so that the air willexhaust faster out of the power cylinder 3 through itsexhaust valve 54, than it enters through the by-pass valve 42. The efiective opening ofthe by-pass valve 42 can be made verysmall, since thisby-passvalve is not utilized until the pressing-head 33 is in or close to its pressing position.

The cam 43 can be adjusted soas to openbypass valve 42 at any predetermined point'before the machine is wholly closed. The opening-of by-pass valve 42 can be announced by a suitable signal (not shown), The operatorcan then release the buttons of valves 52 and 53, thus ale lowing said valves to close. Airwill thenlpass through by-pass valve 42 much more slowlythan it canpass through valves Hand 53, whenisaid valves 52 and-53 are open, so that the machine will finally close without shock. The head. 33 and the appurtenant moving parts have. considerable momentum. Hence the by-pass valve 42 can operate as a shock-absorber, during the closing of the machine. The valve l I can also be adjusted so as to cause the air to move out of cylinder 3, at a regulated rate, thus regulating the speed of piston 4. The inlet port of member 9 is wholly or partially open when piston 4 is at the end of its power stroke. In Fig. '7, the inlet port of member 9 is shown as being partially open.

Since the air exhausts out of cylinder 3 through valve 54 much more rapidly than the air enters the cylinder through by-pass valve 42, the air pressure in cylinder 3 will be rapidly reduced, and the return springs 56 and 34 will open the machine.

As soon as the pressing-head 33 has been raised a short distance, as for example, between A; inch and inch, the cam member 43 will release the lever 60 of theby-pass valve 42, so that the by-pass valve 42 will close, thus permitting the air to exhaust very rapidly-out of the power cylinder.

Fig. shows the improved control system, applied to a pair of pressing machines which are arranged in tandem. These machines have a common air intake-pipe 31a which are connected to branch pipes 10 and II. The pipe 10 is connected to the cylinder 3a; of one of the machines through a pair of valves 52 and 53 of the type previously described. The pipe (I is connected to the cylinder 3b of the other machine, through a pair of similar valves 52 and 53. The first machine, which has the cylinder 3a, is provided with a by-pass pipe line 38a having a by-pass valve 420 which is operated by means of a cam lever 43a, in the manner previously described.

The second machine which has the power cylinder'3b, also hasa by-pass pipe line controlled bythe by-pass valve 42d, which is operatedby the cam member 43d in the manner previously described. The first machine has an exhaust valve 54c which is operated by pilot valve 54d, and the second machine has an exhaust valve 54 which is operated by a pilot valve 54g. The pilot valve 54d of the first machine can be connected to the pipe line 10 through the valve 640, which has the manually-operated lever 550. The pilot valve 54g of the second machine can also be connected to the pipe line 10 by means of the valve 64a and its manually-operable lever 55a. The pilot valve 54d can also be connected to the pipe line H through a valve 55k and its manually-operated lever 64k. The pilot valve 54g ofthe second machine can also be connected to the pipe ll through the valve 64d which is controlled by means of the manually-operable lever 55d. Therefore, each machine has manuallycontrolled means for opening said machine and also for opening the companion machine.

The operation of the parts shown in Fig. 10 is the same as that shown in Fig. 9. For example, operator can first depress the buttons of one of the pairs of valves 52 and 53, thus starting the closing of the first machine. As soon as the first machine has been closed sufiiciently to open the by-pass valve 420 thereof, the operator can then release the buttons of the valves 52 and 53 of the first machine, and then open the valves 52 and 53 of the second machine. After the pressing operation has been completed in the first machine, the operator can open the first machine by moving the lever 550 of the first machine and he can also open the second machine by moving the lever 55a which is also located upon the first machine. The second machine also has imanually-operable'levers di.and 6410 for respectively opening said second machine and for opening the first machine. V

As shown in Fig. 2, when the machine is fully open, the axis of piston rod 5 is located intermediate the pivot pins l1 and I8. Lever 44 is longer than the effective axis of first knee-lever I6. The dimensionsof knee-levers I6 and I9 are substantially identical. The distance between pivot pins l1 and I8 is substantially equal to the distance between pivot pins 2| and 23. Lever 22 is longer than lever 20. The parts are thus dimensioned and designed so as to secure quick closing and maximum pressure when the machine is closed. i

While we have shown preferred embodiments of our invention, numerous changes and emissions can be made without departing from its spirit, and our invention includes many valuable features and sub-combinations which can be embodied inmachines which differ greatly from the machine illustrated herein.

For convenience, the lever 44 can be designated as being connected to pressing head 29, although said connection is indirect.

Likewise, the by-pass valve 42 may be designated as having lower capacity than valves 52 and 53 (when said valves are fully opened) since the rate of flow of the compressed air through the fully open valves 52 and 53 exceeds the rate of flow through valve,42, when it is fully opened. In the same manner, exhaust valve 54'may be designated as having greater capacity than bypass valve 42.

Whenever we refer to the by-pass valves as normally closed in the claims, said claims are I not necessarily limited to, a valve which is normally closed by a spring (not shown). The machine could easily be provided with a cam for closing the by-pass valve, during the opening movement thereof. The designation normally closed means that the by-pass valve is closed when the machine is open.

We claim:

1. A garment-pressing machine comprising a power cylinder having a piston movable thereon, a movable pressing-head connected to said piston, said cylinder having an inlet'pipe-line adapted to be connected to a source of fluid under pressure, first valve-means adapted to control said inlet pipe-line so as to admit or exclude the fluid, a by-pass pipe connected at one end thereof to said power cylinder in advance of the connection between said cylinder and said inlet pipeline and also connected at the other end thereof to said inlet pipe-line in advance of said first valve-means so that fiuidcan pass from the inlet pipe-line to the by-pass pipe when said first valve-means are closed, a normally closed by-pass valve located in said by-pass pipe, control means connected to said pressing head and movable in unison therewith and adapted to open said bypass valve at a predetermined point in the closing movement of the machine, and then to keep said by-pass valve open until a predetermined point in the opening movement of the machine, an exhaust valve connected to said cylinder and of greater capacity than said by-pass valve, means adapted to operate said exhaust valve, means adapted to open the machine when the pressure in the power cylinder falls below a predetermined pressure.

2. A garment-pressing machine comprising a power cylinder having apiston movable thereon,

a movable pressing-head connected: to-said piston, said cylinder having an inlet pipe-line adapted to be connected to a source of fluid under pres sure, first valve-means adapted to control-said inlet pipe-line so as to admit or exclude the fluid, a by-pass pipe connected to said-power cylinder and also connected to said inlet pipe-line in advance of said first valve-means so that fiuid can pass from the inlet pipe-line tothe by-passpipe when said first valve-means are closed, anormally closed by-pass valve located in said-- by-pass pipe, control means connected to said pressing head and movable in unison therewith and adapted to open said by-pass valve ata predetermined point in the closing movement ofthe machine, and then to keep said by-pass valve open-until a predetermined point in the opening movement of the machine, an exhaust valveconne'cted' to said cylinder and of greatercapacitythan said Icy-pass valve, meansadapted to operate said exhaust valve, means adapted to open the machine when the pressure in the power cylinderfall's below a predetermined pressure, said machine ineluding a pilot-valve adapted to open said exhaust valve, a pilot-valve pipe connecting said pilot-valve to said inlet pipe-line in advance of said first valve-means, said pilot-valve pipe-line having a normally closed and manually control lable valve. Y a

3. In a pressing machine whichhas a movable head and a buck, a power cylinder which has a piston, means connectingsaid head to said 'pi's ton, said power cylinder having an inlet end through which actuating fiuid can be admitted in order to operate the piston during its power stroke in order to close the machine, afirst-inlet pipe-line connected to said inlet end of the cylinder, said pipe-line'being adapted to be con-' nected to a source of fluid under pressure, said first inlet pipe-line having first manually-actuated valve means which are adapted to ope'n and to close said first inlet pipe-line, a second inlet pipe-line which is also connected to saidcylinder at its inlet end, said second pipe-line being also adapted to be connected to a sourcezof'fluid under pressure, second valve means located in said second pipe-line and'adapted' to oTpenand'to. close said second pipe-line, said second valve means being biased to .n'or'malyclosing position, automatic means adapted to open the second valve means during the closing movement of the machine and then to keep said second valve means open while the machine is closed, in orde'r'tof admit fluid under pressure into said. cylinder at its inlet end through said second inlet pipe-line. independently'of the firstfiinlet pipe-lineand'to keep the machine closed under the. pressure of fluid supplied by said second inlet pipe-line, a manually-operable exhaust valve connected to said power cylinder and of greater outlet capacity than the inlet capacityof' said second; valve means, whereby the air pressure in said power cylinder can be lowered by openingsaid exhaust valve while the secondvalve means are open, machine-opening means independent .ofxsaid power cylinder and adapted to' move the head away from the buck, the force of said machineopening means being less than 'the first .of. said piston under the full pressure of the fluid which is supplied to the cylinder through said second inlet pipe-line, so that the machine is. opened. by said machine-opening means onlyafterl said ex.- haust valve is opened. l l' f 4. A pressing machine having abuck and a pressing head which isJmovable':relative-toxsaid;

buck, actuating-means adapted to be actuated by fluid; under pressure,- said. actuating-means being adapted to move the head towards the buck so as to close the machine, manually-controlled first valve-means" which I are normally closed and which are adapted. .to admit fluid under pressure to said actuating-means when said first valvemeansare opened, inorder to move the head towards the buck, second valve-means of smaller capacity than the first valve-means, the second valve-means being also. adapted to admit fiuid under pressure to: the aforesaid actuating-means when said second valve-emeans are open, in order to-urge the headtowards the buck, the second valve-means being biased to normal closing position, automatic means adapted to open the second valve-means at a predetermined point in the movementof-thehead towards the buck and then to keep-the second valve-means open while the machine is closed, a manually-controlled exhaust valve connected to said actuating-means and of greater outlet capacity than the inlet capacity of said second valve-means, whereby the actuating fluid can be exhausted from said actuating means when the exhaust valve is opened and while the-second valve-means are open, machine-opening means adapted to move the head away from the buck, the force of said machineopening means being less than the machine-closing force which is exerted by said piston under the fullpressure of the fluid which is supplied through said second valve-means, so that the machine is opened by said machine-opening means only after said exhaust valve is opened.

5. A garment-pressing machine having a frame and a'pressing head connected to. an arm which is pivoted to said-frame, said machine also having a buck, a-cylinder having a piston having a piston rod, meansadapted to admit fluid under pressure into said cylinderto move the piston outwardly relative to said cylinder, a first lever pivotally connected to said piston rod said first lever being" connected at firstand second pivot points respectively to a second lever and to a third lever, the second lever being pivotally connected to the frame at apoint spaced from the first pivot point, the third lever being respectively connected at'third and. fourth pivot points to a first toggle-lever and to a second toggle-lever, the first toggle-lever being pivotally connected to said arm of the head at a point spaced from the point at which said arm is pivoted to said frame, the second toggle-lever being pivotally connected to the frame, thedistance between the first and second pivot points being less than the distance between the second pivot points and the point at which the piston rod is connected to the first lever, said toggle-levers being constructed and adapted to turn said arm so as to move the pressing head towards the buck when said piston is moved outwardly in said cylinder.

6. A garment-pressing machine having a frame and a'p-ressing head connected to an arm which is pivoted to said frame, said machine also having a buck, a cylinder having a piston having a piston rod, mea'ns'adapted to admit fluid under pressure into said cylinder to move the piston outwardly relative to said cylinder, a first lever pivotallyconnected to said piston rod, said first lever being connected at first and second pivot points respectively-to a second lever and to a third lever, the second lever being pivotally connected to the frameiat .axpoint spaced from the first pivot point, thethird: lever being respectively connected at thirdland fourthapivot. points to a first toggle-lever and to a second toggle-lever, the first toggle-lever being pivotally connected to said arm of the head at a point spaced from the point at which said arm is pivoted to said frame, the second toggle-lever being pivotally connected to the frame, the distance between the first and second pivot points being less than the distance between the second pivot points and the point at which the piston rod is connected to the first lever, the distance between the third and fourth pivot points being less than the length of either toggle-lever, said toggle-levers being constructed and adapted to turn said arm so as to move the pressing head towards the buck when said piston is moved outwardly in said cylinder 7. A garment-pressing machine having a frame, an arm pivoted to said frame, a pressing head connected to said pivoted arm, a buck connected to said frame, a cylinder, a piston slidably located in said cylinder, a piston-rod connected to said piston, said cylinder having an inlet-port, means adapted to supply fiuid under pressure to said inlet-port to urge said piston and said piston-rod outwardly in the power-stroke of said piston, a first lever external to said cylinder and pivotally connected to said piston-rod, a second lever, said second lever being pivotally connected to the frame, said first lever being pivotally connected to said second lever by a first pivot-member which is movable relative to the frame and which is spaced from the point at which said second lever is connected to the frame, a third lever, said first lever being connected to said third lever by a second pivot-member which is movable relative to the frame and which is spaced from the first pivot-member, a first toggle-lever, a second toggle-lever, the third lever being connected to the first toggle-lever by a third pivotmember which is movable relative to the frame, the third lever being connected to the second toggle-lever by a fourth pivot-member which is movable relative to the frame, the first togglelever being connected to said pivoted arm at a point spaced from the head and also spaced from the point at which said arm is pivoted to the frame and also spaced from the third pivot-memher, the second toggle-lever being pivotally connected to the frame at a point which is spaced from the fourth pivot-member.

8. A garment-pressing machine having a frame, an arm pivoted to said frame, a pressing head connected to said pivoted arm, a buck connected to said frame, a cylinder, a piston slidably located in said cylinder, a piston-rod connected to said piston, said cylinder having an inletport, means adapted to supply fluid under pressure to said inlet-port to urge said piston and said piston-rod outwardly in the power-stroke of said piston, a first lever external to said cylinder and pivotally connected to said piston-rod, a second lever, said second lever being pivotally connected to the frame, said first lever being pivotally connected to said second lever by a first pivotmember which is movable relative to the frame and which is spaced from the point at which said second lever is connected to the frame, a third lever, said first lever being connected to said third lever by a econd pivot-member which is movable relative to the frame and which is spaced from the first pivot-member, a first toggle-lever, a second toggle-lever, the third lever being connected to the first toggle-lever by a third pivotmember which is movable relative to the frame, the third lever being connected to the second toggle-lever by a fourth pivot-member which is movable relative to the frame, the first togglelever being connected to said pivoted arm at a point spaced from the head and also spaced from the point at which said arm is pivoted to the frame and also spaced from the third pivot-member, the second toggle-lever being pivotally connected to the frame at a point which is spaced from the fourth pivot-member, the extended longitudinal axis of said piston rod being located between the first pivot-member I! and the second pivot-member I8 when the machine is fully open, said'first pivot-member and said second pivot-member being located on the same side of said extended axis when the machine is fully closed.

WILLIAM N. LAUER. WALTER A. HOCH.

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