US1789486A - Press - Google Patents

Description

J n- 20, 193 M. M. TITTERINGTON 1,739,435

PRES-S Original Filed Jan. 22 2 Sheets-Sheet 1 20, 1931. M. M. TITTEIQINGTON 1,789,485

PRESS Original Filed'Jan. 22, 1924 Z'SheetS-Sheet 2 n M 5 \\\\\\\\\\\N a) I BY I TTORNEYS Patented Jan. 20, 1931 PATENT OFFICE LIORRIS M. TITTERINGTON,

MENTS, TO THE PROSPERITY COMPANY, INC.,

PORATION OF NEW YORK Application filed January 22, 1924, Serial No. 687,765. Renewed August 14, 1929.

This invention relates to presses useful principally for pressing all manner of work usually requiring considerable pressure, such for example as pressing garments or other materials, for laundry pressing and ironing, and for pressing, stamping, and forming up sheet metal parts and the like.

An object of the invention is to simplify the design and construction of high power pressing machines, as well as flexible steam and air connections commonly used on all pressing machines, whereby heat, pressure and steam may be simultaneously applied to the work; and in addition thereto, an object is to construct a power pressing machine without resorting to the .,use of electric moto1's. steam or air cylinders, cams, gears, or

similar generating and transmission elements so commonly used to produce high pressure. i A further purpose of the invention resides in the capacity of my improved press to generate pressure by utilizing power derived from a fluid heating medium to operate my improved pressure creating means. which is to say that I utilize a portion of the steam ordinarily employed to heat the pressing members and steam the work, and thereby produce pressure by employing a medium of power which is already present and available in the pressing machine, thus saving the expense of installing special electrical trans mission lines such as is necessary for'electric motor power presses.

Another object is to produce a fluid pressure operated press which is cleaner in operation than cylinder operated presses and I accomplish this by employing non-leak expansilile bellows placed adjacent the press jaw. The condensation occuring therein is exhausted from the bellows and does not leak on or about the floor as occurs with the cylin der and piston operated presses.

A still further object is to produce new and a improved cooperating ])l8SS1I1 Q']3.WS or members. either the head or buck. or both whereby the meeting pressing faces equalize upon. over, and across the work by virtue of an inherent ability to moveabout'the longi- 'tudinal and transverse axis of the elongated 0F BROOKLYN, YORK, ASSIGNOR, BY MESNE ASSIGN- OF SYRACUSE, NEW YORK, A COR- PRESS head or buck member, which is to s'aytha .one or the other or both of the pressing members wobble, so to speak, over the garment or over the work thereby readily and effectively pressing objects which are of uneven and variable thickness. It is appreciated by those skilled in the art that various commodities to be pressed. such for example as heavy and light garments-may be thin at one end or edge and thick at the other; and inasmuch "ity of equalization, as just described. or the adj ustability and adaptability thereof to uneven and irregular surfaces, the structural improvements herein described render :it unnecessary to employ expensive construction in mounting the press head or buck on equalizing springs heretofore widely employed in pressing machines. and such desirable results are due to the flexible expansion diaphra-gms I employ for developing the pressing power.

This power pressing machine embodies one or more bellows diaph'ragms, or corrugated" tubular expansion members, for producing great pressure by thrusting the pressing aws together. or by moving the buck upwardly against the head, and-thediaphragm draws steam from a main steam .supply. pipe ordinarily-utilized for heating one or both, of the steam for treating the work to bepressed. For the sake of convenience the tubular b e1 lows are ofttimes referred to by their trade name. sylphon. 1 It is to be understood that my improved head or buck pressing member, that isthe upper or lower pressing member jaw, may be embodiedin duplicate in a pressingmachine whereby each member is constructed in accordance with the principle of this invenQ' tion, but this is not strictly necessary, for the reason that-a pressing' maehine in reality requires only one pressing member embodying my invention. It is therefore appreciated that either the upper or lower pressing mem pressing members as well as for supplying .operator closes the pressing machine.

hers may be constructed in accordance with this invention, but for the purposes of the present application, a description of the lower press jaw, i. e. the buck, will be given.

The accompanying drawings illustrate a preferred embodiment of theinvention serving to illustrate the principle of the invention, and in certain respects the structure thereof. It; is to be appreciated that variations in design of parts and mode of operation thereof may be made without departing from the scope of my invention.

. Figure 1 shows a pressing machine frame of any'suitable design such as are presently used and upon which is installed the novel power press producing elements constituting my invention.

Figure '2 illustrates a plan view of the pressin member, in this instance the lower one, embodying the features of my invention.

Figure 3 illustrates a longitudinal vertical sectional view taken through the pressing member and illustrates a pair of bellowspressure producing diaphragms, one of which is in section and the other of which is in elevation, together with flexible or expansible tubular connections for transmitting steam and air to and from the movable pressing member. I

Referring now more particular to the drawings for a detailed description of the invention, it is observed that a suitable form of pressing machine frame 10 carries a press lever 11 pivoted at 12; and a toggle comprising links 13 and 14 depends from the press lever 11 and is pivoted at 15 on the back end thereof. The press lever is made with a forwardly reaching handle 9 by which the The toggle links are pivoted together at 16, and the link 14 in fact constitutes one arm of a bell crank, the other element of which is designated as a pedal or manually operated lever 17. The bell crank pedal 17 and lower toggle member 14 are pivoted on the frame 10 at 18. A kick-off pedal 19 is pivoted on the frame and adapted to thrust upwardly against the pedal 17 to break the toggle 13 14-rearwardly to swing the press lever 11 on its pivot 12 and lift the press head high above the buck to produce a wide opening motion of-the press. As a means of counterbalancing the closing mechanism, a weight 20 may be carried. on the rear end of the press lever 11 for quickly opening the press after the kick-off pedal 19 is actuated, and

this weight, or for example a tension spring, serves to hasten the press opening operation after the toggle is broken. Furthermore, I provide a rest or toggle stop 21 on the frame against which the toggle rests. after reaching an over straightened position thereby supporting thetoggle against the compressional strain which ensues during the high compression operation as will now be explained.

A main supply pipe 23 conveys steam to one or both pressing members for the purpose of heating and steam spraying the garment where such spraying operation is desirable. Certain types of pressing machines provide heating means only. On the other hand many pressing machines, as for example tailor presses, preferably have steam spraying chambers in addition to the steam heating chambers. My improvements are intended to'be used in connection with any or all types of pressing machines including the two kinds named, and so the steam supply pipe 23 supplies fluid pressure, for example, steam, to the head 24 for heating this pressing member as well as for steam spraying a garment or other work if desirable; and a steam spray valve 25 is carried on the head 24 for the purpose of ejecting or spraying steam from the foraminous press face of the head 24 on to the work supported on the buck.

The lower pressing member, the buck, may be constructed similar in design to pressing bucks now employed in that the buck structure may preferably embody a foraminous press plate 26; and a combination steam spraying and air suction chamber 27 is formed in the buck directly underneath the plate and communicates with the outer atmosphere through the press plate perforations 28. A web or wall 29 is interposed in the buck'to provide a closed heating chamber 30; and the lower wall 31 rests directly on a buck frame specially designed to carry the power generating elements.

A buck frame comprises supporting parts or legs 33 which are placed upon the main bill IOU

buck frame 33 extends upwardly where at each end thereof is formed a cylindrical cup or housing 34 for the reception of fluidoperated expansion members which lifts the buckwith great force upwardly during operation of the pressing machine. The buck frame 33 preferably carries longitudinally connecting walls 35 serving to form an integral and rigid structure with the cups 34 dis posed in spaced relation. The buck frame carries integral brackets 36 and 37 for the purpose of supporting one end of certain expansion or flexible tube connections, as will be explained; and the frame is also provided with an outstanding lug or boss 38 at each end for the purpose of retaining the buck on the frame. I

Having described the structure of the buck as well as the supporting frame therefor, it will now be understood how the said buck, as shown in Figure 3, is supported at each end thereof on the lugs 38 of the frame; and retaining means, such as guide pins 39, are anchored tothe buck wall 31 and slidably confined in the lugs 38 and are thus guided up and down in the frame as the buck rises and falls. The lower end of each guide pin or screw 39 is fitted with a spring 40 interposed between the head of the cap screw and the boss 38 for the purpose of yieldingly restraining the buck 31 in downwardly limited position. Thus it is seen how the buck 31, after it is driven forciblyupward, is drawn back to normal non-pressing or lightly pressing position through the agency of the springs 40 as well as by its weight.

For the purpose of forcibly inducing high compression between the head and buck, I utilize preferably cylindrical corrugated bellows by mounting one or more bellows in such position as will force'the buck 31 up against the head. To this end a diaphragm pressure producing device is assembled and then seated in the cup 34, and this device consists of a corrugated tubular bellows 42 fitted 'with a closed head 43 at one end and a similar head 44 at the other end thereof to form a fluid pressure tight diaphragm unit. The lower. closure head 44 is made with an internally threaded boss 45 for the purpose of connecting a steam supply pipe to the bellows; and it is also made with a lug 46 which registers with a hole made in the cup 34 for the purpose of locating the power unit in proper position in the frame as well as for restraining the diaphragm unit from turning while connecting asteam pipe therewith. The lower end 44 of the unit rests immovably or fixed in the frame cup 34' hile the upper end thereof rests movably in contact with the underneath side of the buck 31.

' A steam pipe 48 is connected with the diaphragms, and where two or more diaphragms are employed the said pipes 48 are connected to each bellows and are preferably brought down to a common connection and joined to a valve 49. The valve 49 is provided with an exhaust or discharge port 50 which opens the pipes 48 and diaphragms 42 to atmosphere three-way valve is connected with the main supply steampipe 23 thereby bringing fluid pressure suchas steam. directly from the boiler toone'or more of the diaphragms.

The construction and arrangement of parts is such that when the valve handle 52 is brought to the position EX, the steam is exhausted from one and all ofthe diaphragmsv separately expanded by thereby enabling the springs 40 and guide pins or screws 39 to draw the buck 31 downwardly thus removing high pressure from the machine. By bringing the control handle 52 to the position L, the left-hand diaphragm only receives steam thereby producing high pressure on the left-hand side of the press, and in a similar manner extreme pressure is produced on the right-hand end of the head and buck by throwing the handle 52 over to the position B. By bringing the handle 52t0 the position B, steam is fed to both diaphragms whereby uniform high pressure is produced all along the meeting faces of the head and buck.

For the purpose of heating the buck, it is necessary to establish a flexible steam point connection between the buck'heating chamber 30 and ,the steam supply pipe 23; and to this end, a pipe 54 connects with a diaphragm tube base orhead plug 32 held in the bracket '36, and the steam supply pipe 23 connects with the pipe 54. An expansible and contractible bellows tube 55 is secured to the plug 32 and rests on the bracket 36, and the upper end is connected to the buckbottom inlet port thus directly connecting the steam pipe 23v with the heating chamber 30. The tube connection 55 expands and contracts longitudinally with the rising and falling motion of the buck; and'in this manner I have provided an improved flexible steam pipe connection designed to supply steam to a movable pressing member. X

. For the purpose of supplying steam to the buck spraying and suction. .chamber 27, a

similar diaphragm or flexible connection 56 is'established between the buck 31 and bracket 37, the lower end of the tubular bellows connection 56 being immovably anchored to a diaphragm head resting in the bracket 37 and has its upper end connected to the movable buck whereby the suction and spray chamber 27 connects directly with the ex-,

pansible and contractible tube 56 through the spray and suction port or passage 58 leading from the diaphragm 56 upwardly to the chamber 27.- A pipe 57 connects with the lower stationary end of the .tflexible member 56 as well as connecting with the steam pipe 23.

A steam spra' and suction valve 59 controls the flow o steam from .the ipe 23 upw'ardly through the pipe 57 and exible connection 56 to the foraminous spray chamber 27. A suction or vacuum pipe 60 connects with the steam spray and suction control vacuum'such as a suction pump, not shown. A valve control handle .61 actuates the valve 59 through a rod 62. When the valve handle 61 is brought to a vertical position as shown I i i in the drawings, both the steam pipe 58 and vacuum pipe 60 are closed off thus producing no suction downwardly through the forami- 1 valve 59 and runs to any suitable source of nous plate 26 as well as giving no steam spray upwardly therethrough. However, when the valve handle 61 is brought to the position S, the pipe 23 instantly feeds steam upwardly through the pipe 57 and flexible connection 56 to the chamber 27 to steam spray and treat the garment resting on the buck. Thereafter the valve control handle 61 is moved over to the position V to close or cut off the steam pipe 28, and bring into operation the vacuum connection 60 whichexhausts the air and steam from the suction chamber 27 I this difliculty by accommodating its pressing surfaces to all manner of irregular and uneven garment thicknesses by reason of the fact that the buck is capable of an easy lat.- eral and longitudinal rolling and pitching motion, which is to say that the improved pressing member is capable of wobbling or lifting higher on one side or end than on the other thus quickly taking up all clearances which would otherwise exist between the pressing members due to irregular and odd-shaped pieces of uneven thickness.

Furthermore it ofttimes occurs that an operator may not wish to press across the entire surface of the cooperating pressing members. For example in pressing some parts of garments or other objects, it is necessary to repress or overpress a garment or some portion thereof, and the operator invariably uses one end of the pressing jaws for this purpose. It is therefore appreciated that the purposes of economy are served by moving the valve 49 over to one side as to the position L whereby one end only of the pressing machine is brought into high pressure operation thus drawing steam from the boiler for one bellows only.

The pressing jaws 0r cooperating pressing members 24 and 31 are opened or closed. by any suitable pedal or hand-operated means such as is shown in'the drawlngs. Light, initial or ordinary pressure 1s secured by merely closing the head 24 onto the buck by use of the pedal or handle because theclosmg mechanism is so adjusted as to bring the cooperative pressing members into light or initial pressing coaction. When the head is thus closed the operating toggle 1314 stands at a straight line position or an over straightened position which braces 1t aga nst the stop 21 whereby the toggle forclbly braces the press lever 11 and firmly holds the head down during the extremely high pressure operation as exerted by the expansion of one, or more bellows 42. After the high pressure operation is consummated the steam is exhausted from the machine by operating the valve 49 which removes high pressure froin'between the head and buck, and there-.

diaphragm and its housing assembly, it is to be noted that I preferably install each diaphragm in a relatively deep cup 34 the upper rim of which may reach well above the upper end of the diaphragm containedtherein; and the diaphragm head 43 carries a reach wall, flange or rim 41 which reaches up to the buck 31 and establishes lifting engagement therewith. This construction as sures the confinement of the diaphragm in the cup at all times, and even though it may expand upwardly for some distance, still the upper rim or edge of the cup 34.- is well above the diaphragm thereby completely housing and protecting it as well as establishing a solid cast iron wall as a barrier between the steam expansion device and the machine operator.

In this improved press, I have presented a high power machine capable of operating by steam without adverting to the use of a cylinder and piston structure which is always objectionable because of leaks developing around such parts. Inasmuch as the diaphragms have no external moving or reciprocatlng parts, with no stufiing boxes to wear out and require repacking, and inasmuch as the water of condensation is instantly blown out during the exhausting operation, it follows that no leaks will ordinarily develop around the high pressure operating mechanism of this power press other than through accident or carelessly assembled pipe connections.

I have adopted bellows-like tubing as one practical form of diaphragm for pressing machine uses because they are durable. corrugations make the bellows longitudinally contractible and expansible while the said corrugations at the same time impart radial strength to the bellows units enabling them to withstand extremely high pressure.

The improvements in flexible tube con nections 55 and 56 are used for conveying steam and air to form the movable pressing member because they present a closed structure and there exists no sliding or rotating stufling box joints to get out of order and to leak and repair such as is common with pressing machines now in use. These joints are inherently flexible by virtue of the cor- The 7 9 one of the j aws, a pipe connecting with each rugations and withstand high fluid pressure because of the reinforcing factor resident in thecorrugated circular rings;

The frame of the machine is designed to fixedly support all thebellows at the bottom thereof while the upper ends of the bellows pressure units merely rest in contact with the pressing buck to lift upwardly thereon; and the fluid conveying bellows are connected with the buck parts by the fluid tight joints. This brings the several bellows into alignment, and manufacturing assembly operations are thus rendered simple and convenient.

. This design *and general organization and arrangement of parts constitutes a compact trim structure in that the power generating parts are concealed and protected; and the customary large clumsy underneath heavy frame structure is dispensed with because no motor means or high power moving parts are required to be supported by the frame; and the invention is presented to fulfill the needs felt for a reliable, inexpensive, positive operating machine of few moving parts.

hat I claim is 1. A garment press or ironing machine comprising in combination, pressing jaws adapted to close upon the work, a plurality of bellows cooperating with the jaws and adapted to force the pressing jaws together under great pressure, means connecting said bellows with a jaw to permit the pressing jaw faces to universally accommodate themselves to uneven surfaces, and means for bination, a frame provided with a pair of supplying fluid pressure to the bellows.

'2. A machine comprising in comblnatlon,

pressing jaws adapted to close upon the work,

a plurality of'bellows cooperating with the jaws and adapted to force the pressing aws together under great pressure, means connecting said bellows with a jaw to permit a wobbling jaw movement enabling the pressing jaw faces to universally accommodate themselves to uneven surfaces, means for supplying fluid pressure'to eaclr'bellows', and a control device forming part of the means whereby the bellows may be independently the jaw faces or jointly operated to produce pressure across the entire jaw faces.

3. A machine comprising in combination, cooperating pressing jaws arranged to open and close against each other, a frame sup-i portingone of the pressing jaws, cups rigidly carried by the frame, a diaphragm carrie within and protected by each cup with one 7 end of each diaphragm fixed in each cup and the other end thereof operatively engaging diaphragm. and 'a .valve included in the pipe to control the flow of steam or fluid pressure to one or all the diaphragms..

4. A pressing machine comprising in combination, cooperating pressing members dewith great force, and fluid pressure supply means operable to expand one diaphragm to produce pressure at one end of the pressing members or operate both diaphragms to produce pressure substantially throughout the length of said pressing members.

5. A pressing machine comprising incombination a frame provided with a pair of spaced cup-shaped receptacles, support brackets formed on the frame, a pressing member supported on the frameand relatively movable thereto and provided with'a spray and suction chamber and a heating chamber, a pressure bellows disposed in each receptacle to forcibly move the pressing member, a corrugated tube connection supported on each bracket-and joining respectively with the spray and suction chamber of the pressing member, and the heating chamber, steam pipe connections running to the several corrugated tubes, a suction means connected with the suction chamber, and a pressing headcooperating with the pressing member.

6. A pressing machine comprising in comspaced, cup-shaped receptacles, support brackets formed on the frame, a pressing member supported on the frame and relatively movable thereto and provided with a spray-suction chamber and a heating chamber, a pressure diaphragm disposed in each receptacle to forcibly move the pressing mem: ber, a corrugated tube connection supported on each bracket and joining respectively with the spray=suction-chamber and the heating chamber, steam pipe connections running to the several corrugated tubes, a suction means f connected with the suction chamber, a pressing head cooperating with the pressing member, manually controlled means for separately or jointly operating the pressure diaphragms and control means for producing a suction in the spray-suction chamber.

,7. A press compr1s1ng,-cooperat1ng press d jaws including ahead and buck operating means to open and close the jaws, means to mount the buck for movement in relation to the head after the press is closed, a pipe connecting with the head and supplying steam thereto for heating and steam spraying purposes, a valve carried on the head for ejecting steam onto the buck, said buck being provided with a heating chamber and with a foraminous suction-spray chamber, :1 diajoining the last namedsteam pipe and suction pipe and adapted to be manually operated to first open the steam pipe to spray steam through the foraminous chamber and thereafter turned to another position to cut off the spray and connect the suction pipe with the chamber to produce an air flow down through the chamber.

8. 1 pressing machine embodylng in combination, pressing members comprising a head and buck, an operating means to open and close the press and lock the head against thebuck, a diaphragm located at each end of one of the pressing members, a steam pipe connecting with each diaphragm, a valvein the pipe to feed steam to one or both diaphragms at the will of the operator whereby one end or the entire area of the pressing member is forced into compression.

9. A pressing machine embodying incombination, cooperating pressing members comprising a head and buck, an operating means to open and close the press and lock the head against-the buck, a diaphragm located at each end of the pressing members and adapted to thrust one member against the other after the press closes, a steam pipe connecting with each diaphragm, and a valve in the pipe to feed steam to one or both diaphragms at the will of the operator whereby one end or the entire area of the pressing members are forced into compression.

10. A machine comprising in combination, a. frame, cooperating pressing members adapted to open and close one onto the other, one of the members being provided with a chamber utilized for receiving a treating me dium, means to support the chambered member so that the latter may be movable on the frame and a longitudinally expansible tube connected with said chamber enabling the member to undergo relative motion and receive the treating medium.

11. A press comprising work receiving jaws which open and close against each other, an expansible fluid pressure corrugated wall bellows, frame means anchoring one end of the bellows stationary, connecting means joining the other and movable end of the bellows to a press jaw to force the jaws together under high compression, and saidpress jaw being free for movement so that it may have a universal wobbling motion to compensate for unevenness of work received into the jaws.

12. A press comprising work receiving jaws which open and close against each other, an expansible fluid pressure corrugated wall bellows, frame means anchoring one end of the bellows stationary, connecting means joining the other and movable end of the bellows to a press jaw to force the jaws together under high compression, said press jaws being free for movement so that it may have a universal wobbling motion to compensate for unevenness of work received into the jaws, said press jaws being provided with a chamber to receive a medium for treating the work, and an expansible tube secured to the chamber and adapted to expand and contract during movement of the press to convey the medium to or from the jaw.

13. A press comprising work receiving jaws which open and close againsteach other, one of the jaws adapted for high compression against theother after the press closes, means mounting said high compression jaw for relative universal compensating final pressure movement after the press closes, and an, ex-

ansible fluid pressure corrugated wall belows one end of which is stationary and the other end of which engages the high compression jaw to move it under great pressure.

14. A press comprising work receiving jaws which'open and close against each other, one of the aws adapted for high compression against the other after the press closes, means mounting said high compression jaw for relative universal compensating final pressure movement after the press closes, an expansible fluid pressure corrugated wall bellows one end ofwhich is stationary and theother end of which engages the high'compression jaw to move it under great pressure, and a frame cup adjacent the high compression aw in which the bellows is housed.

15. A press comprising; a frame, press jaws carried thereon, and operating means to open and close the jaws and produce jaw compression; one of the jaws being provided with achamber to receive fluid thereinto, means to mount this last named jaw for pressure movement after the press closes, a longitudinally expansible tubular means having one end thereof connected with the fluid chamber and movable therewith and having its other end secured against movement in a stationary manner to the frame, and a fluid connection established with the stationary end of the tubular means. I

16. A press comprising, a frame, jaws carried thereby, operatin means to open and close the jaws and pro uce jaw compression, and means to mount one j aw on the frame as a compression jaw movable in relation to and against the other jaw after the press is closed; said compression jaw being provided with a perforated spray-suction chamber and with aheatingchamber, a corrugated longitudinally expansible and contractible tubular connection mounted under the compression jaw and having one end thereof Connected with the spray-suction chamber and movable with this jaw and having its other end secured in a stationary manner in the frame, and another corrugated longitudinally expansible and eontractible tubular connection mounted under the compression jaw and having one end thereof connected with the heating chamber and movable with this jaw and having its other end secured in a stationary manner on the frame.

17 A pressing machine comprising cooperating press jfLWSfl-Ild operating means to open and close the same, a fluid-actuated bellows disposed at and connected with each end i of one jaw'to force it against the other jaw to produce high compression after the press closes, a pipe line connected with the bellows, and a valve control means 'in the pipe line.

18. A pressing erating press jaws and operating means to open and close the same, motor means disposed at each end of one jaw and'connected therewith to force it against the other jaw closed thereagainst to produce jaw compression, and means to supply a driving medium to the motor means to actuate the same.

19. A pressing machlne comprislng cooperating press jaws and operating means to open and close the same; a frame means and.

a housing integral therewith, one of the aforesaid press jaws being carried by the frame means and housing, and means is provided to afford limited movement of this last named jaw in relation to said frame means and houslng to produce high compression between the aws; motor. means mounted within the housing and connected with the therebelow, motor means disposed in each housing part and engaging one jaw to actuate and adapt the same as a high-compresmachine comprising coopable high-compression jaw and connected with the chambers.

.e 21. In a garment or ironing press, coacting press jaws and operating meansto open and close the press, one of the jaws being provided with a heating chamber and perforated spray chamber, a plurality of bellows disposedadj acent the last named jaw, fluid connections from some of the bellows adapted as flexible connections to the chambers to convey fluid thereto, and other bellows having their one ends sealed and directed against the jaw, and means to supply fluid under pressure to all the bellows.

In testimony whereof I afiix my signature.

MORRIS M. TITTERINGTON. I

sion jaw, the high-compression jaw being provided with fluid receiving chambers; and

corrugated-circular tubes disposed. adjacent the housings and between the housings and having their one ends attached to 'the frame and consequently heldstationary, a pipe connected withthe stationary tube ends, and

having their other ends attached to the m'ov-

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