US2986081A - Photographic printing apparatus - Google Patents

Description

3 Sheets-Sheet 1 Filed Nov. 13, 1957 F'IGJ INVENTOR FREDERICK O- TRUMP:

6% 1' BY ATTORNEYS 3 Sheets-Sheet 2 Filed Nov. 15, 1957 INVENTOR F'REDEFZ ICK O- TRUMP ATTORNEYS May 30, 1961 F. o. TRUMP 2,986,081

PHOTOGRAPHIC PRINTING APPARATUS Filed Nov. 13, 1957 5 Sheets-Sheet 3 :HIIIIIIIIIIIAIJIIINIHI INVENTOR FREDERICK O- TRUMP BY 66% 71d ATTORNEYS United States Patent PHOTOGRAPHIC PRINTING APPARATUS Frederick 0. Trump, West Springfield, Mass, assignor to Tecnifax Corporation, Holyoke, Mass., a corporation 1 of Massachusetts 1 Filed Nov. 13, 1957, Ser. No. 696,180

14 Claims. (Cl. 95-77.5)

This invention relates to a combined photographic dry printing and developing machine and more particularly to the printing apparatus thereof and novel arrangement of printer mechanism for the assembly of the machine.

A principal object of the invention is to provide a printing cylinder assembly with associated parts arranged for ready and convenient removability from, and insertion into, an operative position in the machine and for accessibility to various and sundry components thereof for inspection, cleaning, repair or replacement purposes.

Another object of the invention is to provide a printer assembly unit in a dry-type developing machine which may be inserted into and withdrawn from operative relationship at the front of the machine. A related object is to eliminate the need for excessive space requirements at one side or another of the apparatus in order to enable the withdrawal and installation of printing cylinders and associated apparatus endwise of a side frame.

A further object of the invention is to provide a novel inlet and outlet duct arrangement for the pressure and suction passages leading to the printing cylinder, the printer unit having a dual manifold structure slidably registrable therewith for connection of necessary ducts for ventilation of the machine.

These and many other specific objects and advantages of the present invention will be apparent from the following disclosure of an embodiment thereof as shown in the accompanying drawings, in which,

Fig. 1 is an end elevational representation of a machine in which the present invention may be embodied and in which major components of the operative mechanism are schematically illustrated by dotted lines to show the general operation thereof;

Fig. 2 is a front end view with parts cut away of a removable printer carriage unit indicated by Fig. 1;

Fig. 3 is a side view of one of the manifold units seen in Fig. 2, the side wall panel being removed and certain parts omitted;

Fig. 4 is a detail view substantially on line 44 of Fig. 3;

Fig. 5 is an end elevational view of the frame mounted pressure and suction passage connections for the printer unit of Fig. 3;

Fig. 6 is a side edge view of the structure of Fig. 5 with the adjacent manifold unit in operative position, and showing the driving means associated with belt assemblies of the carriage unit and portions of the frame members being in section;

Fig. 7 is a sectional view substantially on line 77 of Fig. 5;

Fig. 8 is a fragmentary section on line 8-8 of Fig. 5;

Fig. 9 is a fragmentary section on line 9-9 of Fig. 6; and

Fig. 10 is a vertical sectional view (with parts omitted) taken through the printing cylinder.

The general arrangement and operation of the drytype printing and developing machine will be appreciated from Fig. 1'. One side frame is indicated at 10 with 7 2,986,081 Patented May 30, 1961 front and rear base extensions at 12 and 14, respectively,

mechanism, etc. It will be understood a similar side frame is located in spaced relation at the other end of the machine. Between the upper portions of side frames 10 is mounted a developing tank 16 with an ammonia tray 18. Around the tank is an endless conveyor as a sealing sleeve 19 for passing exposed sensitized photographic sheets over the surface of the tank through the developing zone thereof. Below the tank is positioned the printing section of the apparatus, this being generally designated by numeral 20.

In the printing section 20 of the frame an endless conveyor belt 22 is mounted, an upper roller 24 and lower roller 26 being vertically spaced from one another at the forward end of the frame. Between the rollers 24 and 26 a printing cylinder carriage 28 may be slidably inserted as will be described. In its operative dotted line position, a cylinder 30 tensions the belt 22 against its surface for exposing a sensitized sheet carried by the belt. In its withdrawn or inoperative position the cylinder carriage 28 (as shown by dot-dash lines) may be positioned on the feed table portion at 32 at the top of section 12. In the latter position of the carriage the belt 22 is draped loosely from roller 24 between opposite side frames 10. Free access may thus be had to the carriage for needed inspection, repair or replacement purposes in connection with any of the parts of the carriage.

From Fig. 1 it will also be seen that a master sheet, from which copies are to be taken, may be fed into the machine on top of a sheet of sensitized photographic copy paper. The two sheets may be guided from the feed board surface at 32 onto the feeding end of belt 22 which is above roller 26. The two sheets are then passed between belt 22 and an auxiliary feed belt 34 of the carriage to the lower side of cylinder 30 and around to the top of the cylinder. Pick-01f mechanism mounted on the carriage at 36 assists in separation of the two sheets from the cylinder to follow the underside of belt 22 which bears against an upwardly inclined suction box at 38 positioned between side frames 10. Suction holds the two sheets thereagainst being assisted by an auxiliary belt 40 mounted on the carriage 28. Belt 40 passes around a suction cylinder 42 which serves to draw the master sheet (now the lower sheet) away from the copy paper which continues to be held by suction box 38. The master drops away from belt 40 to be stacked or rolled in the fore portion of the carriage 28. A stationary stacking tray is shown at 44 for receiving the separate master sheets. Alternatively, the tray 44 may be removed if the master is in the form of a continuous web. In this latter case a belt 46 receives the master sheet and with the belt 46 moving past a back-board member 48 the web may be automatically rolled up at the front of the carriage.

The sheet to be developed as will be seen is carried up to the roller 24, transferred to a belt 50, and thence carried to the sealing sleeve 20 and around the developing tank 16. From the upper side of the tank the now developed copy is transferred again by belt 50 to the stacking tray at 52 where it is disposed face up for inspection by an operator standing at the front of the machine.

In Fig. 2 frame members 11 of the spaced side frames 10 are shown and it will be realized from the drawings and the preceding description of the operation with reference to Fig. 1 that the side frames 10 support the tank and endless belt supports between the upper sections thereof, and that the tank 16 and sealing sleeve bridge a cavity between the frames into which the printing cylinder carriage 28 may be moved into operative position. Attached to the members 11 are oppositely disposed angle iron supports 54 on which are carried rails 56 formed as toothed tracks for receiving the supporting pinion wheels at 58 and 60 (see Fig. 3) of the carriage 28. The rails 56 are positioned on the side frames at the level of the feed board and extend onto the board 32 as shown by Fig. 1 for travel to and from the operative and withdrawn positions.

The carriage 28, as will be seen from Figs. 1, 2, and 3, comprises a pair of manifold members 62 between which is supported the printing cylinder 30. The feed belt rollers for belt 34, the rollers and suction cylinder 42 for take-off belt 40, the pick-off member 36, and tie rods for the wheel pinions 58 and 60all extend between the manifolds 62 to tie the opposite sides of the carriage together. The cylinder 30 is formed with end rings at 64 (Fig. 2) cradled in rocking bearing assemblies 66 at each side of the cylinder (Fig. 3). The bearing assemblies are bracketed inwardly of each manifold inner wall 63 (Fig. 2). End bearings, one of which is shown at 68 in Fig. 3, abut opposite edges of the cylinder to position the same properly between the manifolds.

Interiorly of the cylinder 30 and supported directly by the manifolds is a partitioning member for dividing the cylinder into a lamp chamber section and a pressure chamber section through which cooling air may be conducted for ventilating the cylinder. The partitioning member 70 (see Figs. 3, 7 and 10) is semi-cylindrical in form (Fig. 10) and is disposed with its flat wall 72 centrally of the cylinder and facing the belt contacting side thereof. A lamp bracket 74 is fixed to the wall on which a lamp as at 76 (Fig. 3) may be hung. The member 70 (Fig. 7) extends inwardly of the inner manifold wall 63 through an opening 78 and at the top and bottom of the opening are lugs 80 (Fig. 3) against which member 70 may be positioned. At each end the edges of end walls 82 overlap the opening 78 (see Fig. 7), and are positioned as by a supporting block as at 84. Thus the partitioning member (see Fig. 10) forms a pressure chamber within the same and into which cooling air may be conducted as will be described. Outlet openings 86 at the top are directed forwardly of the member and openings 88 are directed rearwardly for circulation into the surrounding sections of the cylinder.

It will be seen from Fig. 1 that the belt contacting area of the cylinder and therefor the light exposure zone of the mechanism begins at a six oclock position of the cylinder and ends at a twelve oclock position. In order to shorten the exposure time shutter means are provided, as best shown by Fig. 3, to blank the light from striking a sensitized sheet passing into the entrance section of the full exposure zone. A flap as at 90 for each half of the cylinder is hinged along its lower edge across the lower portion of the flat wall 72. A rod 92 is secured across the mid section of the flap 90 and extends beyond the edge of the cylinder into the manifold 62 of the carriage. Mounted in each manifold is an adjusting means for tilting the flap 90 forwardly to shield the lower entrance section of the cylinder as shown by the dotted line position of Fig. 3. Embracing the rod 92 are the forked arms of an actuator member 94 fixed at the outer end of a bar 96 which is'supported for sliding movement in the manifold. Movement toward the inner end of the manifold will shield the entrance end of the cylinder (the dotted line position) and toward the outer end will permit full exposure to the lamp (the full line position). Bar 96 is slidably supported near its outer end by a bracket 98 and at the other end in a rack bar mounting member 100. At this end a rack 101 is fixed on the upper surface of the bar and in mesh therewith is a gear 102 driven by a chain and sprocket arrangement 104 (see also Fig. 2). The bar 96 is guided on a cross member 106 of the mounting member 100 above which is journaled the axle 108 for the sprocket and gear. The chain is. driven from a sprocket 110 (Fig. 3) hung in a bracket111 fixed to the top wall of the manifold and car- W shaft. ich, h SP QCkQt d a e: knurled wheel 112 are fixed. The knurled wheel projects 4 through an opening in the front wall of the manifold and is there accessible for manual turning by an operator in order to drive the chain and thus adjust the flap as desired. It will be realized that a duplicate mechanism in association with the manifold at the opposite side of the frame permits a wide flexibility for adjustment of light for a printing operation.

As seen by Fig. 7 the end wall 82 of the partitioning member 70 is formed with an opening 114 into the manifold. In opening 114 is fitted a connecting conduit section 116 for passage of air under pressure. Section 116; as seen from Figs. 8 and 5, is a passage from which a portion of the air under pressure may be diverted upwardly into a branch conduit 118 as by a deflector 117 (see Fig. 8). The branch 118 leads into the opening for the pressure chamber 36 (Figs. 1 and 3) above the cylinder and from which air is expelled (in the direction of the arrow 37 in Fig. 3) to strip sheets from the exit end of the cylinder forpassage tothe take-01f belt 40.

The conduits 116 and 118 may be suitably formed as a part of the outer manifold cover wall as at 119 (Fig. 7) and passage from the lamp section of the cylinder is provided through the opening as at 120 surrounding the pressure conduit 116. The latter opening in the operative position of the carriage registers with the opening of a collecting chamber '121 of an exhaust manifold designated generally by numeral 122. The exhaust manifold 122 is provided with a circular lip 124 aligned with the opening 78 which leads through the carriage manifold from the printing cylinder 30. Fixed in the outer wall of the exhaust manifold 122 is a pressure source conduit 126 which registers with the conduit 1 16. An elbow 128 leading to conduit 126 is connected to a flexible hose 130 and thus to a suitable source of supply. Exhaust manifold 122 also is formed with conduits for collecting exhaust fumes from the developing tank 16 as through a suction line 132 (Fig. 5) and for creating suction in the chamber 38 (see Fig. l) as through line 134, the connection to these members not being shown herein. An exhaust port is shown for the mani fold in the form of flexible hose 136.

The manifold 122 is pivotally mounted at its lower edge on the side frame, as seen from Figs. 5 and 6, by brackets 1 40. At the top a tension spring 142, hooked to the frame wall 11 and to the outer edge of the manifold holds the lip 124 urged inwardly on its pivot to register with the opening of the carriage manifold. As seen in Figs. 6 and 9 a beveled edge portion as at 144 will be in the path of the leading corner of the movable carriage as' it is being pushed into position between the side frames. Accordingly, the exhaust manifold 122 'will be cammed against the spring 142, rock on its pivot, and be seated snugly in registered position when the carriage is moved into its operative position. The lip 124 is against the edge of the opening of the manifold and the pressure conduit 126 is registered with the conduit section 116.

It will be seen that carriage 28 may be manually pushed from its withdrawn position (Fig. 1) (on the track 56 of the feed board section 34 and outwardly of the side frames 10), to its operative position between the frames 10 and thus automatically establish the. interconnection of pressure and exhaust passages for conducting air to and from the various chambers associated with the cylinder. During such movement an electric line for the lamp 76 remains connected thereto. Line 150 enters the carriage manifold at therear for the lead; to the lamp (Fig. 3) and as seen from Fig. 1 is passed over a guide roll 152 to be looped at: the rear of the machine by a weighted take-up pulley arrangement 154. Withdrawal of the carriage thus brings the line 150 along with it. On returnv of; the carriage to operative position the weight returns the line to the looped position shown. I

n ts am t wv 129 16 between. he, m s-the can.

'riagemay be locked in the assembly by means of bolting devices associated with eachof the manifolds 62. As'shown by -Fig. 4 the frame wall 11 has a bolt opening 160 into which the end of a bar bolt 162 may project. The bolt 162 is slidable in a guide 164 and is formed with a rack on its upper surface. In mesh with the rack is a toothed gear 166 of a shaft 168 projecting outwardly through the front wall and a boss thereon with a handle 170 at its outerend. Radially of the shaft is a latching knob 172with a stern having a headed end 174 slidable in a recess of the handle and against which is urged a spring-loaded headed stem 176 slidable in a recess of the boss. In the position shown spring normally maintains the stern head 176 in the recess of the handle to lock it against rotation. Pressure on knob 172 pushes the head 176 out of the handle recess and enables turning of the handle to project the bar 162 into locking position. Bar 162 is also spring loaded as at 178 to assist its movement to locked position. Thus when the carriage is in operative position between the frames the spring.178 will normally hold the bar 162 locked. The operator unlocks the same by positively turning the handle 170 of eachmanifold member until the stern 176 projects into the handle recess at which position the bolt 162 is withdrawn. The carriage can then be withdrawn and the bolts 162 are inoperative until such time as the operator desires to re-establish the locking position by again pressing against knob 172.

As previously described with reference to Fig. 1 the path of the conveyor belt 22 extends rearwardly from a lower roller 26 adjacent the front of the side frames to an upper roller 24 also forwardly located .between the frames. The drive for belt 22 comprises a chain 180 driven by a motor (not shown) engaging a sprocket 182 of the roller 26. Gears for driving the roller and belt arrangements mounted between the carriage manifolds 62 are fixed at each end of the roller 26. One such gear is shown at 184 in Figs. 3 and 6', it being noted that the axle of roller 26 is suitably mounted in frame wall 11 with drive sprocket 182 fixed at its outer end and a sprocket and chain 183 drive inwardly thereof for extending upwardly to drive the roller drive (not shown) of the sealing sleeve 20 of the developing tank.

Gear 184, as shown by Figs. 3 and 6, is disposed immediately below the toothed track 56 on which the carriage wheels 60 and 58 ride. The teeth of the gear 184 are thus positioned to engage and mesh with the teeth of a gear 186 supported on a shaft 188 mounted between the manifold walls. Also mounted on shaft 188 is a gear 190 which drives a gear 192 (Fig. 3) to transmit movement to a gear 194 on the shaft 195 of the driving roller 196 (Fig. 6) for driving the auxiliary feed belt 34. A sprocket chain drive 198 for rollers of the takeoff belt 40 (Fig. 1) extends as shown by Fig. 3 from the shaft 195 of the feed belt roller to drive the shaft 200 ofa drive roller for the belt 40.

The driving arrangement described for theroller means mounted in the carriage 28 is thus engaged for operation by positioning the carriage between the side frames. This places the frame mounted gear 184 in mesh with the carriage mounted gear 186. In such position the handles 170 may be manipulated to engage the locking bolts to maintain the operative position for the printing apparatus. Additionally as seen in Figs. 1 and 3 a cut-off switch assembly 202, located at the rear frame section, is actuated by a projecting member 204 fixed to the rear end wall of the manifold. Member 204 energizes the switch to establish the motor circuit (not shown) which drives the sprocket chain 180. Accordingly, the circuit is effective only when the carriage is in operative position. Withdrawal of the carriage will render the drive mechanism inoperative by interrupting the circuit.

Having described the invention what I claim is:

1. In a dry-type printing and developing machine having side supporting frames, at developing tank and sealing 15 sleeve means supported therebetween with an' endless conveyor belt arranged to deliver exposed photographic sheets to said sealing sleeve; vertically spaced roller means forwardly of the frames. and between which said; conveyor belt is loosely draped, a printing cylinder unit movable between the side frames and having a printing cylinder engageable with the belt to' tension the same against the cylinder rearwardly of said roller means inv a position of operative assembly therewith, auxiliary belts mounted on said unit and engageable in said assembled position of the unit with portions of said conveyor belt leading to and from the lower and upper sides respectively of the cylinder, interconnecting driving means between said auxiliary belts and power take-off means between said driving means and the lower roller of said vertically spaced roller means. I

2. The structure of claim 1 in which pressure and suction passage means are mounted on said supporting frames and pressure and suction passage means are housed in said cylinder unit, said unit and supporting frames having pressure and exhaust port means for registration and connection in said operatively assembled position of the unit.

' 3. The structure of claim 2 in which the'pressure and suction passages of each supporting frame are contained in a composite manifold member pivoted on the frame with spring means yieldably urging said member inwardly of the frame, and movement of the cylinder unit into. assembled position cams said member againstthe said spring means to effect registration of the said ports of the unit and frame. I

4. Photographic printing apparatus comprising spaced side frames, endless conveyor belt roller supports mounted between said frames and having upper and lower members 'between which a cylinder may be inserted for tensioning a belt trained around said members, horizontal track means fixed intermediate said upper and lower members, a movable carriage supported on said track means including a printing cylinder lying transversely between said frames for engaging the belt, open-ended pressure and suction conduits mounted on said frames, the open ends of said conduits facing interiorly of the frame and said carriage having mating conduit ports for registration with the aforesaid conduits at one limit of frame movement, said cylinder having interconnecting pressure and suction passages for cooling the interior thereof and a lamp chamber and lamp facing the belt contacting surface of the cylinder, and lamp circuit means supported on said frame and connected to said lamp including means for maintaining the connection therewith at opposite limits of carriage movement.

5. Photographic printing apparatus comprising side; frames, a movable carriage mounted between said frames having a printing cylinder mounted transversely of the path of travel of said carriage, means mounted between; said frames engageable by said cylinder at one limit of movement of the carriage and forming with the cylinder a conveyor path for passage of sensitized photographic sheets over the surface of said cylinder, a lamp and interconnecting pressure and suction passageways for circulation of air in said cylinder, ports for said passageways formed in said carriage, and pressure and suction conduits on said frames with ports therefor registrable with the corresponding ports of said carriage at said one limit of movement, saidcarriage at its opposite limit of movement exposing said cylinder and passageways associated therewith for access thereto free of said side frames.

6. Photographic printing apparatus comprising side frames, a movable carriage mounted between said frames having a printing cylinder mounted transversely of the path of travel of said carriage, an endless belt having rollers spaced at opposite sides of said path between said frames for engagement of the belt under tension by said cylinder at one limit of movement of the carriage and forming with the cylinder a conveyor path for passage aosepsi ofsensitized photographic sheets over the surface of said cylinder, a lamp and interconnecting pressure and suction passageways for circulation of air in said cylinder, ports for saidpassageways formed in said carriage, and pressure and suction conduitson said frames with ports therefor registrable'with the correspondin'g'ports of said carr'iage at saidone limit of movement, said carriage at its opposite limit of movement exposing said cylinder and passagewaysassociated therewith for access thereto free of said side frames. 9

7. The structure of claim 6'in which a suction tank is mounted between said frame adjacent the exit end of the conveyor path around the cylinder and the engagement of said cylinder with the belt results in disposing the belt against said suction tank for carrying an exposed sensitized sheet on the belt beyond said cylinder.

' 8. Photographic printing apparatus comprising spaced side frames, a movable carriage mounted between said frames having a pair of spaced manifold members and a printing cylinder supported at opposite ends between said members transversely of the path of travel of said carriage, an endless belt'arranged between said frames and engageable by saidcylinder to tension the beltthereagainst at one limit of'movement of the carriage and thereby form a path for travel for sensitized photographic sheets against the surface of said cylinder, partition means supported by said manifolds, extending through said cylinder remotelyfrom the belt contacting surface thereof, and having an elongated inlet chamber for receiving air under pressure, said chamber having openings therefrom for discharge ofair into the surrounding area of the cylinder, a lamp mounted on said partitioning means facing said belt contacting surface of the cylinder, adjustable shutter means mounted on the partitioning means for shielding portions of said cylinder from said lampand means for actuating said shutter means operable from the front of said manifold members, said manifold members having inlet and outletpassage means at opposite ends of said cylinder with ports for said pressure and discharge chambers, and pressure and suction conduits on said frames with ports therefor registrable with the corresponding ports of said manifold members at said one limit of movement, said carriage at its opposite limit of movement exposing said cylinder and passage means associated therewith for access thereto free of said side frames.

9. Photographic printing apparatus comprising spaced side frames having a pair of vertically spaced horizontal rollers disposed forwardly between the frames and carrying an endless conveyor belt therebetween, horizontal track means above the lower of said rollers extending between said frames and forwardly thereof, and a cylinder 10. The structure of claim 9 in which apressurecham ber extends between said manifolds and is 'disprmed between said cylinder and said take-off belt; for directing air to strip sheets from the cylinder, and said passage means of the manifolds includes a branch pressure conduit in communication with said pressure chamber.

' 11. The structure of claim 9 in which suction means are associated with said auxiliary take-off belt at the end thereof and a-stacking tray for receiving sheets is disposed therebelow at the front of said carriage.

12. In 'a dry type printing and developing machine having supporting means, a developing tank and sealing sleeve means supported thereby and conveyor means in eluding an endless belt for transferring exposed photocarriage supported on said track means, said carriagecomprising a pair of spaced manifold members having a'printing cylinder supported therebetween and movable on the track to an operative position rearwardly between the frames with the cylinder in belt tensioning position and to an inoperative position forwardly of the frames and free of said belt, said manifold members supporting therebetween an auxiliary feed belt engageable with the lower run of said endless belt for directing photographic sheets for travel around said cylinder, an auxiliary take-off belt engageable with the upper run of said conveyor belt for directing exposed sheets along the upper run, a lamp and air conduit means extending through said cylinder with passage means in said manifoldsfor conducting air into and out of the cylinder, said frame having mating pressure and suction passages registrable with said manifold passage means on insertion of said carriage into said operative position.

graphic sheets to said sealing means; a printer unit mounted for movement relative to said supporting means and having a printing cylinder rotatably mounted thereon, a pair of vertically spaced rollers over which said belt is trained, the lower of said rollers being'disposed adjacent the front of the machine, said printer unit being movable to an operative positionwherein the printing cylinder is spaced substantially r'earwardly of both of said rollers and tensions the belt against said rollers, said printer unit being moved to an inoperative position spaced forwardly of said rollers, the lower surface of said printing cylinder in its operative position lying substantially on the same level as the upper surface of the lower roller thereby forming a horizontally disposed lower run of said belt which comprises a feeding section thereof for the advance of photographic sheets'to said printing cylinder, the lower surface of the upper of said rollers being spaced above the upper surface of said printing cylinder in its operative position, thereby forming an upwardly inclined run of said belt which comprises a delivery section thereof for the travel of exposed sheets from said cylinder, a suction box mounted on said supporting means along said upper run for holding the exposed sheets against the delivery section of said belt for transfer to said sealing sleeve means.

13. The structure of claim 12 wherein said printer unit has an auxiliary feed belt assembly mounted thereon in cooperative relation with the sheet feeding section of said conveyor belt in the operative position of said printer unit, and an auxiliary take-01f belt assembly is mounted on said printer unit in cooperative relation with the delivery section of said belt when the printer unit is in its operative position, and means are providedfor driving said auxiliary belt assemblies and said conveyor belt at the same rate.

14. The structure of claim 13 wherein the driving means for said auxiliary belt assemblies comprises a takeoif connection with the lower of the vertically spaced rollers, and wherein the power take-01f is automatically engaged when said printer unit is moved to said operative position.

References Cited in the file of this patent UNITED STATES PATENTS 1,022,039 Metzger Apr. 2, 1912 1,852,316 Langsner Apr. 15, 1932 2,459,362 Cary Jan. 18, 1949 2,548,936 Blick Apr. 17, 1951 2,574,215 Kunstader Nov. 6, 1951 2,641,980 Brunk June 16, 1953 2,732,778 Limberger Jan. 31, 1956 2,733,644 Taini Feb. 7, 1956 FOREIGN PATENTS 897,004 France May 15, 1944

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