|Publication number||US2955452 A|
|Publication date||Oct 11, 1960|
|Filing date||Mar 6, 1957|
|Priority date||Mar 6, 1957|
|Publication number||US 2955452 A, US 2955452A, US-A-2955452, US2955452 A, US2955452A|
|Inventors||Elmore Myers Wayne|
|Original Assignee||American Laundry Mach Co|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (12), Referenced by (15), Classifications (10)|
|External Links: USPTO, USPTO Assignment, Espacenet|
Oct. 11, 1960 Filed March 6, 1957 W. E. MYERS EXTRACTOR 6 Sheets-Sheet 1 INVENTOR. Mf/YEfi/VORE fixer:
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EXTRACTOR Filed March 6, 1957 6 Sheets-Sheet 3 INVENTOR.
My: 162M015: M22776 W. E. MYERS Oct. 11, 1960 EXTRACTOR 6 Sheets-Sheet 4 Filed March 6, 1957 Igii VE M- MM i W. E. MYERS Oct. 11, 1960 EXTRACTOR 6 Sheets-#Sheet 5 Filed March 1957 INVENTOR. War/v5 621w! IZYEAS JV /7 W. E. MYERS Oct. 11, 1960 EXTRACTOR 6 Sheets-Sheet 6 Filed March 6, 1957 INVENTOR. W/mve' fZ/vofie Mme.
arrazwve'rs United States. Patent ice A EXTRACTOR Wayne Elmore Myers, Cincinnati, Ohio, assignor to The American Laundry Machinery Company, Cincinnati, Ohio, a corporation of Ohio Filed Mar. 6,1957, sr. 'No. 644,377
8Claims. 01. 68-242) This invention relates to extractors of the type em- Z An object of the invention is to provide, in combination in an extractor of the type hereinabove characterized, certain novel structural features permitting self-containment of a liquid reservoir from which the pressure fluid is withdrawn, and to which said fluid is returned, during top of annular space 14, and a bottom 11b completes an extraction cycle.
Another object of the invention is to provide, in an extractor of the type defined in the last preceding paragraph, certain cover operating apparatus, novel in struc 2 cover is raised and the cover locking means is in retracted position.
Fig. 9 is a partial view on a larger scale showing the cover in closed and locked position, corresponding to Fig. 4. v
Fig. 10 is a fragmentary enlarged section taken on line 10'-10' of Fig. 9.
Fig. 11 is an enlarged fragmentary sectional view on line 1-111 of Fig. 8.
Fig. 12 is a partial plan view showing the rear housing and the control panel therein.
Fig. 13 is a diagrammatic section showing the type of air valve used in the cover control. p Fig. 14 is the electrical control diagram.
Fig. 15 is'a schematic showing of the Water system.
" Fig. 16 is a left hand elevation-of the extractor as viewed between the extractor and the pumping unit, the assembly being somewhat modified to include an optional-crane and hoist. In this view the cover is raised and swung partly out of the way.
Referring to Fig. 1 a heavy steel tub 10 is positioned within an outer casing 11. Secured integrally, as by weldture, and permitting improved operation. 1
Another object of the invention is to provide an extractor of the type defined in the last two preceding paragraphs, and provided with certain novel and improved locking means.
Another object of the invention is to provide an extractor of the type defined in the last three preceding paragraphs, and provided with power-operated cover opening means in axial alignment with the direction of cover opening and cover closing, the cover being, so to V speak, suspended upon its power operating source.
Another object of the invention is to provide a power fluid pumping arrangement which is distinctly novel and advantageous when used in combination with the s-tructure previously hereinabove defined.
Another object of the invention is to provide an .ex-
tractor of the type herein characterized, in combination with novel and improved loading and unloading means;
Other objects and advantages will be apparent from a study of the following description, in conjunction with the accompanying drawings, in which V Fig. 1 is an elevational view of the right side of the extractor withparts broken away and in section to show internal structural features.
Fig. 2 is a somewhat enlarged fragmentary detail view of the cover and cover support arm, the view being partly in elevation and partly in section.
V Fig. 3 is a fragmentary detail view of the power fluid valve and control arm in a dilfere t operating position from that shown in Fig. 1.
Fig. 4 is a fragmentary sectional view taken on the line 44 of Fig. 9, showing the cover in place and the lock engaged, and also showing the cover-raising and lock-operating means. g
is: a sectional view on line 55 of Fig.4,
part shown in Fig. 4. Fig-7 is a fragmentary section ,on.line..7-..7 of. Fig. 5. Fig. is-a plan view oftthe fapparatus, includingithe. fthe',viewcorresponding 'ififth a t the.
fFig. 6'isa further enlarged fragmentary section of a I ing, to the upper part of the tub is a heavy annular plate 12, likewise secured to the inside of the casing 11. An upstanding ring'section 13 is welded to annulus 12. A top filler ring portion 11a of the outer casing closes the the outer enclosure which with the tub 10 defines a cupped space 15. A set of plates 16 between the casing 11 and tub 10 gives added support and rigidity. This entire group of parts is a unitary welded structure and rests on feet 17. t
An inner rubberbag or liner 18 is securely clamped along a top bead between the plate 12 and a clamping ring 19 by screws 20 (Figs. 4 and 8), the cooperating surfaces each having a recess to accommodate the heavy bead 18a. At the bottom of tub 10 an inlet connection 10:: joins a delivery pipe 21.
Clamping ring 19 forms a seat for cover 22 (Fig. 4), and the upstanding cylindrical section 13 receives the cover with a slight clearance. An internal groove 13a cooperates with locking bars 23a, 23b, 23c and 23d on the cover. The cover has the usual holes 22a for the escape ofexpressed liquid, and a deflector or shield 24. Four, arcuate seating strips 25 (Figs. 4 and 9) on the outer flange of the cover slidably support the locking bars or quadrants 23a, b, c, d,- which lock by outward movement as will appear. Shouldered screws 26 (Figs. 1, 8, 9 and 10) serve to secure strips 25 on the cover while fitting. with clearance through short slots 23a in the lock bars 23a, 23b, 23c and 23d. Each locking bar has a pair of these slots, one near each end, the slots being parallel in a given quadrant and lying in a direction parallel to the central, radius of that quadrant. Thus the direction of movement of each locking quadrant is radial and at 90 to the adjacent quadrants. 'With the bars fully retracted, i.e., unlocked, their ends are in abutting relation can be taken, care of by replacement shims,
and the bars form a ring with an outer diameter equal to that of the seating strips 25 and cover 22 (Figs. 1, 2, and 8). When extended, the quadrants fit into the lock groove 13a, the central portion of each quadrant lying slightly farther in than the ends due to the difference in diameters, and hence the difference in curvatures, of the, quadrants and lock groove. (See, Fig. 9.) The quadrantends in locked position are separated and this gap is utilized as a passageway for the expressed liquid, as will be later noted. The lock groove is fitted with a shim 31 along the top, this being in four parts and held by screws 32. Correct locking fit is thereby obtainable without undue manufacturing precision, and subsequent wear The lock bars are movable into and out of locking position by means of link bars 27. A pin 28 secured at the outer end of the bar fits freely through holes in lugs 29, one lug on each adjoining lock bar. These lugs are pivotally mounted, as indicated at 29a in Fig; 4, to assure freedom of movement in the sliding of the pin in the lug bore. The outer ends of link bars 27 fit between guide studs 30 secured in the cover. At the other end the link bars are pivotally connected to a central upstanding sleeve 33. This sleeve has a certain amount of up and down movement relative to the cover and thereby provides the operating motion for the link bars 27, as will be shown.
Sleeve 33 is vertically-slidable over an airmotor cylinder 34, being in sl-idable contact with cylinder end heads 34a and 34b. Sleeve 33-is slotted .from the bottom almost to the top to receive the inwardly projecting edge of a support arm 35 (Fig. 4) which is rigidly fixed to the wall of cylinder 34. A piston 36 is vertically reciprocable in cylinder 34. Piston rod 36a is connected to the upper end head 33a of sleeve 33, whereby sleeve 33 functions as an operating link extension of piston rod 36a. Sleeve 33 at its bottom end (Fig. 6) has fixed thereto an annular member 37, L shaped in cross section, having a vertical collar 37a and a base 37b and being secured to sleeve '33 by screws 38. The collar 37a of member 37 extends upwardly and is vertically slidable in contact with a cup shaped member 39. This member has around its top edge an oulturned flange 39a also in sliding contact with sleeve 33. When sleeve 33 moves to its uppermost position, it carries the upper surface of collar 37a to contact with the lower surface of flange 39a. Aligned bores in collar 37a and flange 39a receive compression springs 41. A number of guide pins 40 are fixed in flange 39a andextend downwardly within springs .41 into the bores in collar 3741.
Cover 22 is secured to the sleeve cup 39 by screws 42. Thus the cover is raisable by the air motor through sleeve 33 and collar 37a engaged with flange 39a. In Fig. 4 the air is exhausted from motor cylinder 34 and the piston and sleeve are in fully lowered position, the cover being seated and the locking quadrants moved out into the groove 13a in a manner to be more fully described hereinafter. It will be noted that with the sleeve 33 in this fully lowered position its collar 37a is down some distance out of contact with flange 39a. The downward shift of the upward end of link 27 relative to the cover has produced an outward thrust on the links to effect the locking previously explained. The separation between members 37a and 39a, the length and angle of link bar 27 and the movements of pin 28 and quadrants23a, 23b, 23c and 23d are so designed that when the locking quadrants have been retracted flush with the cover periphery, sleeve collar 37a will be in engagement with flange 39a, ready to lift the cover. The lower ends of pins 40,protrude below member 37 and the springs 41 are compressed. These springs are not absolutely necessary, but are considered desirable to assure positive locking movement and. also to cushion the impact between collar 37a and flange 39a. It will be understood that when the cover is being lowered and has just seated, as in Fig. 2, the weight of sleeve 33 and the piston can be suflicient to complete the descent, giving the locking thrust to links 27. There may be friction or binding, however, so that it is preferable to have the springs 41, which expand after the cover is seated and give the sleeve an added downward thrust to assure a more positive, snappy action of the locking elements. When the sleeve begins to rise, the springs are compressed during the unlocking movement, and thereafter the cushioned abutting of collar 37 with flange 39a picks up the load of the .cover which is then raised to the position shown in Fig. 1.
Air cylinder 34 is solidly secured .to an arm or bracket 35 which is swingably mounted at 44 on standard .or supporting column 45. The latter is floor mounted and additionally anchored securely, to the extractor casing by connector pieces 46. The cover when raised can be swung and a double'shaft motor 50 drives both pumps.
4 around out of the way as indicated by broken lines, Fig. 8. A stop screw 47 on arm 35 is positioned to contact column 45 in the other direction to locate the cover in alignment with the extractor opening.
The means for supplying liquid under pressure to the space between the flexible bag and the tub may be of any convenient various 'k=ind, although here disclosed as comprising two pumps connected in parallel flow. One pump 48 (Fig. 8) is of the centrifugal type for moving the liquid rapidly at a comparatively low pressure, and the other, 49, is a reciprocating type producing moderate flow rate but high pressure.
The two pumps may-be part of a self-contained unit The system is showns chematically in Fig. 15, and parts of it in other figures. The sheaves or pulleys of pumps 48, 49 are driven from motor 50 by belts 51, 52 respectively. Pressure or supply pipe 53 and suction or return pipe 54 connect the pump unit with the extractor (Figs. 1, 8 and 15). The low pressure, high volume pump 48 has its discharge 480 connected by pipe 55, check valve 56, nipple 57 and T fitting 58 to pipe 53. Its suction side connects by T fitting 59, nipple 60 and elbow 61 to pipe 54. The high pressure pump 49 has its outlet connected by piping 62, 63 and suitable connecting fittings to T fitting 58 in the pressure line, and similarly, the inlet of pump 49 is connected by piping 64 to the T fitting '59 of the suction line.
.At the extractor, the supply and suction pipes connect to a multiple-way valve 65, Fig. 1. Also connected into this valve are piping 66 leading to a pipe 67 in the reservoir space 15, and pipe 21 connected to the bottom inlet of pressure tub 10. The valve is operable to two positions by a lever 65a. Fig. 1 shows the setting for withdrawing the water from the pressure chamber in tub 10 and putting it into the reservoir. The dotted arrows indicate the path of the two streams through the valve. The suction line 54 from the pumps being thereby in communication with tub chamber 10, the water has been withdrawn therefrom and pumped into the reservoir defined by the casing 11. To avoid obscuring the view, the water is not shown, but with the extractor ready for use there would be water substantially filling the reservoir space. Air above the water is vented at a pipe 68, Fig. 8, in a fitting 69 that carries a level control, to be latter noted. Each brace plate 16 has an upper corner cut off at 1611 to provide an exit for the air entrapped in the pockets defined between plates, i.e., to permit the air to move around to the vent pipe. A filler pipe fitting 70 and a drain fitting 71 is provided in the casing (Fig. 8). Fig. 3 shows the valve 65 as set for the extracting operation. The dotted arrows again indicating the direction of travel of the two streams. Here, water from the reservoir is drawn out through pipes 67 and 66, the valve, suction pipe 54, pump, pressure pipe, valve, and pipe 21 to the pressure chamber between tub 10 and bag 18.
The wet laundry is, of course, squeezed up against the cover 22 by the bag 18, expelling water from the load and out through holes 22a. The water runs down to the flange portion and goes out through the gaps between the ends of the locking quadrants as previously noted, as well as thegaps between the ends of the four arcuate strips 25. From here, it goes down through the clearance space between the cover and the wall 13 and out through holes 13b (several such, although only one shows in these views) into the annular space 14. There can also be a certain amount of water expelled between the cover and seating ring 19, depending upon the closeness of the fit, as the load is pressed upward against the cover. The expressed liquid leaves space 14 through tube 72 (Fig. 12) and goes down through the column 45 and outlet 73, Fig. 1.
A rectangular enclosure 74 (Fig. 12) at the. rear .provides a convenient .place for the electrical and air control parts. 'An inset panel 75 mounts an air valve 76 for operation of thecover, a timer 77, and red and green signal lights 78, 79. Fig. 13 shows semi-diagrammatically the valve 76 in the position wherein, as in Fig. 1, air under pressure is admitted to the cover raising cylinder. Air line 80 connects to a source of compressed air. A pipe 81 from the valve connects by way ofa cross, pipe through column 45, to a flexible pipe or tube 82 (Fig. l) which in turn is'connected to a line 83 running up through arm 35 and connected into the bottom part of cylinder 34. 'When the valve handle 76;: is turned 90 counterclockwise, the inlet is shut off and line 81 (Figs. 1 and 12) is connected to outlet port 7612, whereby to exhaust air from cylinder 34 permitting cover 22 to lower.
The extractor is operated as follows. With the cover raised and swung to the side, a load of wet material is deposited in the work chamber (as by a hoist to be later described. The cover is swung back and the valve-76 operated to exhaust the air from cylinder 34. Cover 22 lowers upon seat 19, Fig. 2,'whereafter continued down ward movement of sleeve 33 is effected by gravity and springs 41, link bars 27 being thereby given an outward .t
thrust, sliding locking quadrants 23 into the groove or recess- 13a as previously explained. As this occurs, a
switch actuator 84, Figs. 1 and 8, moves outwardly and operates a switch 85 mounted on the extractor top. Actuator 84 is in the form of a button or disk on the end of a screw which is carried by an upstanding extension on one of the pusher lugs 29. When the valve 65 is in drain position, Figs. 1 and 14, a switch 86 is held depressed by the arcuate surface of the hub on valve lever 65a. The electrical diagram, Fig. 14, shows the cover switch 85 in normally open position, ready to be closed by actuator 84. A clockwork timer 77, Fig. 12, has not yet been set to the desired extracting time, and its switch 87 is in nor-' mally .open position. The reservoir 15 is full, holding a float switch 88 up as indicated in Figs. 1 and 14. This is a commercial device having the mercury tube 88a inside of a float carried by a flexible tube 88b holding the wires and secured to a connection box 880 in a fixture 69.-
Any conventional float and two position switch could, of course, be used for the purpose. With the float raised, the mercury is at the right hand end, connecting wires 89 and 90. A sight glass 108, Fig. 1, is provided for check ing the water supply in the reservoir.
- Before'starting the operation, the attendant will have made sure that a water vent valve 91 is in open position. He may also set the timer 77 and move the extractor valve 65 to the active position, Fig. 3. Closing of the cover would then initiate the extracting operation. Alternatively, and preferably, the cover can be closed first and the operation started by shifting the valve 65 and setting the timer; or again, either the valve or the timer can first be set and the other one set after the cover is closed. In other words, the cover switch 85, valve switch 86 and timer switch 87 are series connected in the starter circuit of the pump unit motor, so that with the valve in pressure position, the pump cannot be started until the cover is closed and locked and a time set. Another contact in the valve switch 86 (lower position) provides a different circuit for the pump motor starter, independent of the cover switchand timer switch, eifective however, only when the valve 65 is set to drain position.
Assuming the control as being inthe condition shown in Fig. 14, the pump motor is 011 andgreen signal lamp 79 is lit. The circuit goes from L-l, line 92, lower con tact of switch 86; lines 93, 89, mercury switch, line 90, lamp 79, and lines 94, 95 to L-2. If valve 65 is now shifted to pressure position, the flat 65b on the hub permits switch 86 to move to its upper contact, turning ofi the green light. Timer 77 is then set, closing switch 87. Then, when the cover closes and locks, switch 85 is closed, starting the pump motor as follows: line 92, upper contact of switch 86, line 96, switch 85, line 97, switch 87, lines 98, 99, starter switch coil 100, and lines 101 and 95 to L-2. This closes switch 102, energizing pump motor 50.
Water is pumped from reservoir 15jthrough valve 65 (Fig. 3), suction pipe 54, centrifugal pump 48, through check valve 56, supply pipe 53, valve 65 and pipe 21 to the pressure chamber where it raises the rubber bag 18 up about the load and exertsa preliminary squeezing action. As the rated pressure of this pump is reached, the water begins to by-pass through a built-in pressure valve in the pump. At the same time the-pump 49 bepreliminary filling of the pressure chamber. When water begins to flow through indicator 106, the operator closes vent valve 91, and the pressure proceeds to build up. At maximum pressure an unloader in pump 49 permits the water to by-pass inside of the pump, which continues to run, maintaining the pressure. When the timer runs out, the switch 87 opens, breaking the circuit to the switch coil 100, stopping the pumps. When the motor and pumps were operating, the red signal light 78 was on,
being in parallel with the starter coil, the circuit being from L-l, line 92, switch 86 (upper contact) line 96, switch 85, line 97, switch 87, lines 98, 109, 110, lamp 78, and lines 111 and 95 to L-2. This light now goes off along with the motor.
.When the water began to lower in the reservoir, float switch 88 opened the contacts between lines 89 and 90 with no: effect (the green light having been turned off when valve switch 86-was moved to its upper contact). The reservoir being now empty, the mercury is at the left in which 88, making contact between lines 112, 113. Both lights are out. Now the operator opens vent valve 91"which results in a drop in pressure. The operator then shifts the extractor valve lever 65a to the drain position. This moves switch 86 from its upper to its lower contact, starting the pump motor, the circuit going from L-1, line 92, switch 86, lines 93, 112, switch 88, lines 113, 109, 99, switch coil 100, and lines 101, 95 to L-2. Water is thereby pumped out of the pressure chamber back into the reservoir. The red light is again on during motor operation, the circuit now going from L-l, line 92, switch" 86, lines 93, 112, switch 88, lines 113, 110, lamp 78, and
and starting the draining, the cover can be opened by admitting air to lifting cylinder "34 as already described. When the water has again filled the reservoir, float switch 88 rises, breaking the circuit to the switch coil 100, stopping the pumps and at the same time turning the red light oh and the green light on as previously traced.
' The present extractor diifers, as previously noted, from certain prior extractors in the mounting and raising means for the cover. Instead of having the cover supported and raisable by a cylinder in the adjoining standard, the cylinder is at the end of the supporting arm. The column 45 .being simply an unobstructed support permits its utilization as a' portion of a crane, at the option of the user. The column, heavy pipe-stock, is threaded at the top, and can either be covered by a cap member 45a (Fig. 1) or have a matching column 114 (Fig. 16) of the crane secured thereto by a coupling member 115. The conventional pivoted mast is eliminated. The boom or jib 116 is pivotally connected by a pin 117 to a lug or bearing piece 118 near the top of column 114 and has a channel brace 119 set at an angle, with a bottom bearing piece 119a pivotally supported on lower column lug 120 by pin 121. Boom 116 is an I beam, and forms the track for conventional trolley 122 carrying the electric hoist 123 which raises or lowers sling container 124. This present arrangement provides a Convenient unitary, though detachable, arrangement utilizing an element of the associated apparatus. This utilization is made possible by freeing the member column 45.fro m mechanism, and this in turn is accomplished by the locating of the cover-operating cylinder at the end ofsupport 35. I
What I claim is:
1. A laundry extractor comprising a housing having an opening at the upper end thereof, a cover adapted to be raised from said housing to open position and lowered towards said housing to closed position, and operating and sustaining means for said cover'including a 'fixed support, an arm carried on said support and swingable to and from a position above said housing, a power cylinder carried on said arm, a piston in said cylinder, a sleeve movable along the exterior of said cylinder, means connecting said sleeve to said piston whereby movement of said piston produces corresponding movement of said sleeve, a first linkage means suspending said cover from said sleeve, retractable locking means movably carried on said cover and engageable with said housing to retain said cover on said housing, second linkage means connecting said sleeve to said locking means, said first linkage means having a lost motion component therein whereby initial movement of said sleeve retracts said locking means prior to opening movement of said cover. i
2 An extractor as defined in claim 1 wherein said lost motion component includes helical spring means interposed between said sleeve and said cover.
3. An extractor as defined in claim 1 wherein said sleeve and said cover are each provided with loosely coupled, mutually engageable flanges, and compression spring means interposed with respect to said sleeve and said cover in such manner that the first increment of movement of said sleeve compresses said spring means prior to mutual engagement between said flanges.
4. A laundry extractor comprising a housing having an opening at the upper end thereof, a cover adapted to be raised from said housing to open position and lowered towards said housing to closed position, and operating and supporting means for said cover including a fixed support, an arm carried on said support and swingable to and from a position above said extractor, a power cylinder carried on said arm, a piston in said cylinder,
a sleeve surrounding said cylinder and slidably movable vertically with respect to said cylinder, means connecting said sleeve to said piston whereby movement of said piston produces corresponding movement of said sleeve, a first linkage means suspending said cover from said sleeve, cover locking means, second linkage means connecting said cover locking means with said sleeve, whereby downward movement of said sleeve responsive to downward movement of said piston closes said cover and actuates said cover locking means.
5. An extractor as defined in claim 4 wherein the top portion of said housing is provided with an upstanding annular flange, said flange having an inwardly opening peripheral groove, and wherein said cover locking means includes a plurality of arcuate segments carried on said cover and movable into and out of said groove, said segments lying in end to end relationship when Withdrawn from said groove, said segments being operatively con nected to said second linkage means whereby upward or downward movement of said sleeve causes respective movements of said segments out of or into said peripheral groove.
6. An extractor as defined in claim 5 including, in combination therewith, electric circuit means for initiating operation of said extractor, a normally open switch in said circuit means, and switch operating means carried by the cover locking means whereby to close said switch when said segments are moved to cover locking position.
7. A laundry extractor comprising a housing having an opening at the upper end thereof, a cover adapted to be raised from said housing to open position and lowered towards said housing to closed position, and operating and supporting means for said cover including a fixed support, an arm carried on said support and swingable to and from. a position above said extractor, a power cylinder carried on said arm and having an upper end head, a piston in said cylinder, a connecting rod extending from said piston upwardly through said end head, a cupped sleeve surrounding said cylinder and supported on the upper end of said connecting rod, said cover having a centrally located upwardly extending annular boss and said sleeve having its lower peripheral edge in surrounding relationship to said'boss, said boss having an outturned flange around its upper end in sliding contact with said sleeve, and said sleeve having an inturned flange around its lower end in sliding contact with said boss, compression spring means retained between said flanges, whereby upward movement of said sleeve compresses said spring means and raises said cover after a lostmotion initial movement, cover locking means, linkage means connecting said cover locking means with 'said sleeve whereby respective appropriate movements of said sleeve locks or unlocks said cover locking means.
8. An extractor as defined in claim 7 wherein the top portion of said housing is provided with an upstanding annular flange, said flange having an inwardly opening peripheral groove, and wherein said cover locking means includes a plurality of arcuate segments movably carried on said cover and slidable into and out of said groove, said segments lying in end to end relationship when withdrawn from said groove, said segments being operatively connected to said linkage means whereby upward or downward movement of said sleeve causes respective movements of said segments out of or into said groove.
References Cited in the file of this patent UNITED STATES PATENTS 1,585,372 Burnham May 18, 1926 1,872,443 Gosch Aug. 16, 1932 2,022,018 Van Westrum Nov. 26, 1936 2,273,304 Watson Feb. 17, 1942 2,336,428 Watson Dec. 7, 1943 2,556,578 Dohm June 12, 1951 2,673,107 Cornelison Mar. 23, 1954 2,685,189 Watson Aug. 3, 1954 2,766,601 Thiele Oct. 16, 1956 FOREIGN PATENTS 542,560 Germany Jan. 26, 1932 657,700 Great Britain Sept. 26, 1951 921,747 Germany Dec. 30, 1954
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|U.S. Classification||68/242, 49/255, 220/816, 220/323, 220/211, 292/36|
|International Classification||D06F47/00, D06F47/06|