US3884445A - Machine and method for producing a three dimensional lattice - Google Patents
Machine and method for producing a three dimensional lattice Download PDFInfo
- Publication number
- US3884445A US3884445A US467065A US46706574A US3884445A US 3884445 A US3884445 A US 3884445A US 467065 A US467065 A US 467065A US 46706574 A US46706574 A US 46706574A US 3884445 A US3884445 A US 3884445A
- Authority
- US
- United States
- Prior art keywords
- grid
- strands
- box
- needles
- grid box
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/02—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments
- D04H3/07—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments otherwise than in a plane, e.g. in a tubular way
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
- E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
- E04C2/10—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of wood, fibres, chips, vegetable stems, or the like; of plastics; of foamed products
- E04C2/20—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of wood, fibres, chips, vegetable stems, or the like; of plastics; of foamed products of plastics
- E04C2/22—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of wood, fibres, chips, vegetable stems, or the like; of plastics; of foamed products of plastics reinforced
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
- E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
- E04C2/10—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of wood, fibres, chips, vegetable stems, or the like; of plastics; of foamed products
- E04C2/24—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of wood, fibres, chips, vegetable stems, or the like; of plastics; of foamed products laminated and composed of materials covered by two or more of groups E04C2/12, E04C2/16, E04C2/20
Definitions
- a machine for making a three dimensional lattice array of strands within a grid framework The strand lattice can be utilized as a reinforcement for other materials.
- the method of making the three dimensional lattice involves sewing strands in three directions within a grid framework.
- This invention relates to strand lacing machines, and more particularly, to sewing machines capable of making a three dimensional lattice array of strands.
- a second device having a plurality of semi-circular pointed needles, each having a single strand or yarn', is used in conjunction with positioning rods to lace the strands of the frames in only the third dimension.
- the invention contemplated and disclosed herein provides a new, novel and unique sewing machine that produces a substantially uniformly prestressed three dimensional strand lattice that has the attributes of being reliable, reproducible, uniform, economical and achieves solutions to the problems that the prior art has left unsolved.
- Such a machine utilizes new and novel sewing needles which operate in conjunction with a I new and novel grid framework structure that supports
- Still another object of this invention is the provision for producing a three dimensional lattice array of strands wherein the strands are in a substantially orthogonal configuration.
- Yet another object of this invention is the provision for an open grid framework structure that can have a three dimensional array of substantially equally tensioned strands sewn therein.
- Still another object of this invention is the provision for a new type of sewing needle.
- Still yet another object of this invention is to provide a method for making a three dimensional lattice array of strands in an open grid framework structure.
- a feature of the invention is the provision for a needle that sews a plurality of threads.
- Another feature of the invention is the provision for a grid framework structure wherein very fine flexible strands support the sides of the grid box.
- Yet another feature of this invention is the provision for rigid and/or flexible hooks that secure the strands to the grid box.
- Still another feature of the invention is the provision for substantially equally tensioning a plurality of strands that are sewn by such a machine using only a single tensioning device.
- Still another feature of the invention is the provision for means that secure the sides of the grid surfaces to form a grid structure box and also provide for uniformly feeding the grid box in the machine.
- a structural grid box formed with open grid surfaces is placed onto the table of machine.
- a strand attaching means or clip is used to fasten all the strands or yarns to the grid box; the strands coming from the plurality of needles secured to the machine.
- the grid box is placed in position with respect to the needles at the start of the operation.
- the needles moving forward enter the openings in the grid box sewing the strands that are secured to grid surface opposite to where the needles enter, and then the needles are withdrawn from the grid box which is automatically advanced with the sewing cycle repeated.
- the strands are fastened to the grid box and cut therefrom.
- the grid box is repositioned on the machine in a second orientation and theme third orientation so that sewing of the second and third directions may take place in a manner similar to that of the first direction.
- the grid box contains a three dimensional lattice array of strands.
- FIG. 1 is a partial end elevation view of part of the machine portion of one embodiment of the invention
- FIG. 2 is a partial side elevation view of part of the machine portion of one embodiment of the invention
- FIG. 3 is a partial side elevation view of the feeding device for the strand holding means for one embodiment of the invention
- FIG. 4 is a partial side elevation view of the strand guide and strand tensioning device portion of the invention.
- FIG. 5 is a partial end elevation view of the strand guide of the invention.
- FIG. 6 is a segmented view of one part of the grid box portion of one embodiment of the invention.
- FIG. 7 is a cross sectional segment view of a portion of the grid box on the feed table in contact with the feeding device of one embodiment of the invention.
- FIG. 8 is a perspective view of an assembled grid box of one embodiment of the invention.
- FIG. 9 is a partial sectional view of the driving mechanism for the feeding device portion of one embodiment of the invention.
- FIG. 10 is a perspective view of a corner bracket for the grid box portion of one embodiment of the invention.
- FIG. 11 is a side elevation view of a comer bracket of the grid box portion of one embodiment of the invention.
- FIG. 12 is a side elevation view of a corner of a grid box wall of one embodiment of the invention.
- FIG. 13 is a segmented cross section view of one grid box surface of one embodiment of the invention.
- FIG. 13a is a segmented cross section view of a portion of one grid box surface and needles of one embodiment of the invention.
- FIG. 14 is a segmented cross section view of a portion of one grid box surface of one embodiment of the invention.
- FIG. 15 is a cut away perspective view of one embodiment of the invention.
- FIG. 16 is a segmented cross section view of a portion of one embodiment of the invention.
- FIG. 17 is a segmented cross section view of a portion of one embodiment of the invention.
- FIG. 18 is a perspective view of the needle point of one embodiment of the invention.
- FIG. 19 is a segmented cross section view of one grid surface and the needles during the sewing of one grid of one embodiment of the invention.
- FIG. 20 is a segmented cross section view of the grid surface and the needles wherein the sewing has progressed farther than FIG. 19 and depicting one embodiment of the invention
- FIG. 21 is a segmented cross section view of one grid surface and the needle wherein the sewing has progressed farther than FIG. 20 and depicting one embodiment of the invention
- FIG. 22 is a segmented cross section view of one grid surface and the needles on the upstroke of one embodiment of the invention.
- FIG. 23 is a perspective view of another embodiment of the invention.
- FIG. 24 is a segmented cross sectional view of the needle and the upper grid surface of one embodiment of the invention.
- the basic parts of the machine comprise a feed table having a feeding means mounted thereon; a set of needles mounted on a slide that has a reciprocating motion with respect to the table; and, a yarn or strand tensioning device that is co operatively mounted with respect to the needles.
- a necessary adjunct to the machine is a grid box comprising foraminous grid surfaces with the box being held together by rods that function cooperatively with the feeding means to move the grid box through the machine in a preselected time sequence.
- the grid box is capable of being fed into the machine and sewn by the needles; the box maintains the strands in a three dimensional array.
- the needles and the strand tensioning device function to provide substantially equal tension in all the strands during sewing.
- strand includes wire, thread, yarn, monofilament, cable, etc.; all are used interchangeably and are contemplated to mean an elongated flexible element capable of being fed through the needles and the grid box to form a three dimensional lattice array.
- an assembled grid box is positioned on the feed table with the starting ends of the strands or yarns secured to the grid box such as by a yarn clip.
- the feeding means attached to the table moves the grid box along the machine table in a preselected time sequence of move and dwell.
- the needles with the strands of yarns therein enter the grid box surface nearest thereto, passing into and through the grid box and just past the far surface of the opposite grid box surface.
- the needles have special points to cooperate with the strand holding means mounted on the far side grid surface in order to loop and secure the strands thereto.
- the grid box is indexed to its next position and at the same time the strands from the needles partially pass over the near side of the grid surface. These strands are positioned by strand guides located on the exterior of the near side grid boxsurface.
- the needles again enter the grid box thereby completing the first sewing pass and staring the second sewing pass of the strands. This operation is repeated until the grid box is completely sewn in one direction.
- the strands are secured to the grid box such as by a yarn clip and then cut, thus completing the sewing operation in one direction, or for ease of understanding the X direction.
- the grid box is rotated on the table and again fed into the machine.
- the strands are secured to the edge of the grid box and the grid box is, for a second time, indexed along the feeding table with the needle sewing repeated.
- the strands are again secured to the box and cut, completing the sewing the second or Y direction.
- the grid structure is then rotated for a second time on the grid table and fed through the machine with the strands sewn in the same fashion as before, thereby completing sewing in the third or Z direction.
- a three dimensional lattice array of strands completely fills the interior of the grid box.
- the needles operate in the same fashion during the total sewing operation and the strand tensioning device is mounted with the needles on the needle mount to operate continuously and cooperatively; all parts function to insure that all strands are all substantially equally tensioned as they are sewn.
- the invention also contemplates the method of making an open surface grid box having a three dimensional lattice array of strands internally contained therein, with all strands substantially equally tensioned, by the steps of the operation broadly described herein above.
- the basic steps are feeding a grid box into the machine, sewing the strands with substantially equal tension throughout the grid box in three different directions, and securing the end of the strands to the grid box in order to provide substantially equal tension on all the strands.
- a grid box 500 in a preferred embodiment of the invention, comprises oppositely spaced foraminous grid walls 510 and 520.
- the internal surfaces of the grid walls SW and 520 are flat with the exterior surfaces providing hooks and notches for the strands, as shown in FIG. 6.
- the grid walls 510 and 520 are used in pairs being oppositely spaced apart in forming the grid box 500.
- the grid walls 510 and 520 are of substantially rigid frameworks and may be formed of interlocking strips 511 and 512; and, 521 and 522 which define passages 514 and 524 and the interior and exterior grid surfaces.
- the strips 511, 512, 521 and 522 have outwardly projecting undercut ends 515, 516, 525 and 526, as shown in FIGS. 6, 7 and 12.
- the lugs 530 have ears 531 to provide a means for hooking the strands during the sewing operation.
- the tips 532 of the ears 531 are recessed with respect to the exterior surface 520a of the grid wall 520, as shown in FIGS. 14, I5 and 16.
- the ears 531 of adjacent lugs 530 are spaced apart as shown in FIGS. 6 and 7.
- Corner brackets 540 with legs 541 are secured to each corner of the grid walls 510 and 520 where the undercut ends 515, 516, 525 and 526 have been removed, as shown in FIGS. 6, 7, 8, 10, 11 and 12.
- the dogs 542 of the corner brackets 540 are at an angle with respect to the legs 541 and not in the same plane therewith; as shown in FIGS. and 11. l
- the grid box 500 is assembled by inserting undercut ends 515, 516, 525 and 526 of the grid walls 510 and 520 into the undercut grooves 551 of the edge rods 550,.
- the grid walls 510 and 520 are positioned opposite to each other with the notches 518 and lug 530 facing outwardly.
- a second series of grooves 552 on the rods 550 are aligned with the center of the grid passages 514 and 524.
- the three adjacent dogs 542 of the corner brackets 540 are fastened together with snap rings 543, as shown in FIGS. 6 and 8. The dogs 542 do not extend beyond the edges formed by the rods 550.
- the openings 514 and.524 must be alinged and the rows of lugs 530 must be parallel to the notches 518 when the surfaces are opposite each other. It is contemplated that the grid passages or openings 514 and 524 may be square, rectangular, triangular, pentagonal, etc., as desired. Rather than forming the grid surfaces 510 and 520 by interlocking strips, it is fully contemplated that the grid surfaces may be cast or formed in any desired manner.
- edge rods 550 form planar surfaces but the grid surfaces 510 and 520 attached thereto do not necessarily have to be planar.
- the grid surfaces 510 and 520 can be any desired shape as long as they do not extend beyond the planar surfaces defined by the edge rods 550.
- resiliently flexible lugs 530a with car portions 531a may be used in place of the rigid lugs 530.
- lug 530b having movable ear portions 531b may be used as shown in FIG. 17, wherein the cars 5311; are mounted on shafts 532k which can rotate in such a fashion to release the hooked strands.
- the frame 10 supports a feed table 20 which is mounted thereon.
- a pair of upper slideways l3 and a pair of lower slideways 12 are mounted on and secured to the frame 10 in a space relation to the table 20.
- the slideways l2 and 13 are shown covered with dust protectors 12a and 13a.
- Flywheel 30 is rotatably mounted on shaft 33 that is journal mounted 37 on the frame 10 at 32.
- the flywheel 30 is located between the slideways 12 and 13.
- the shaft 33 is connected to a prime mover, such as a motor (not shown) by means of sprockets and a chain (not shown), thereby providing motion for the operation of the machine.
- a counterbalance 35 is slideably mounted on the upper ways 13 and obtains reciprocating motion via the upper connecting rod 34 which is pivotally mounted on the flywheel 30 at 340 and on the counterbalance 35 at 34b.
- the needle holder 40 is slideably mounted on the lower guideways l2 and pivotally connected to the flywheel 30 by the lower connecting rod 36 at 36a and to the needle holder 40 at 36b.
- the needle holder 40 moves back and forth or upwards and downwards, as the case may be, in a reciprocating motion.
- the counterbalance 35 moves in an opposite direction to the needle holder 40 to provide smooth and substantially vibrationless motion.
- a strand tensioning device 50 is mounted on the needle holder 40 and operates to pull the multiple strands from a strand or yarn creel (not shown) during both the upward motion of the holder 40.
- the strand 700 enter through the strand guides 752 secured to the guide plate 751 that is part of the strand guide assembly 750 mounted on the frame 10 at 753, shown in FIGS. 4 and 5.
- the strands 700 passed under the roll 754 and then passes up and over the dancer roll 704 that is part of the strand tensioning assembly 50.
- the strand tensioning assembly 50 is mounted on the movable needle mount 40 while the strand guide assembly 750 is stationary.
- The: dancer roll 704 is rotatably mounted on cantilevers 705 that are secured to the partially rotatable spring tensioned shaft 706.
- the grid pusher assembly 210 is mounted at the side and underneath the feed table 20, and driven by drive assembly 21 as shown in FIGS. 1, 2, 3 and 9.
- Assembly 21 comprises pairs of bevelled gears at each end of shaft 21a; one end thereof coupled to and being driven by the drive shaft 33 and the other end transferring the power for the grid pusher assembly 210.
- the grid pusher assembly 210 has eccentric shaft 231 that is driven by the drive assembly 21 which is'coupled by timing and power transmission gears 233 to the cam shaft 232.
- Suitable journal bearings 234 are mounted on frame 10 to support shafts 231 and 232.
- Pusher arm 211 is eccentrically mounted on shaft 231 at 213.
- a pawl 212 which reciprocatively moves back and forth as the shaft 231 is rotated.
- the upward pusher assembly 220 is mounted on the frame 10 adjacent the pusher arm 211 and connected thereto by coupler 227.
- Cam 221 is mounted on shaft 232 and engaged by cam follower 222 which is part of linkage 223 that is pivotally mounted on the frame 10 at 226 and pivotally connected to the coupler 227 at 224.
- the coupler 227 is pivotally connected to the arm 211 at 225.
- cam follower 222 imparts an up and down motion to the pusher arm 211 that is translated by the linkage 223 in cooperation with the coupler 227.
- a friction brake 45 shown in FIGS. 1 and 2 is
- a dual set of pressure rolls 70 is mounted on a framework 71 that is attached to the frame 10 and the feed table 20.
- One set of rollers 70 is located in front of and just adjacent to needle 60 at the feed-in section of the machine on table 20.
- the second set of rollers 70 is located between the needles 60 and the upright portion of the frame 10. Both sets of rollers are adjusted to a preselected height to create a slight pressure on the rod 550 of the grid box 500 as it is automatically fed to the machine to prevent the grid box 500 from lifting up from the table 20 during the sewing operation.
- the feed table can be slidably mounted on the frame and indexedly moved or advanced by a feeding device similar to the grid pusher assembly 210. This would permit the grid box to be secured to the feed table with both the table and the grid box thereon advancing past the needle mount 40 during the reciprocating motion thereof.
- the grid box can be secured to the table 20 and the needle mount slidably mounted on the frame 10 so that after every reciprocating motion thereof, the mount is advanced with respect to the grid box by a feeding device similar to the grid pusher assembly.
- either the grid box or the needle mount can be slidably advanced.
- the butt or proximal ends 601 of the needle 60 are secured to the moveable needle mounts 40 with mounting brackets 610 as shown in FIG. 4.
- the point or distal end 602 of the needle 60 may be fashioned to sew one or more strands as shown in FIG. 18.
- the needle point 602 has a rather sharply tapered side portion 606 converging at the tip 614. Extending rearwardly toward the butt end 601 are undercut slots 640 on both sides of the needle 60.
- the web 611 formed by the slot 604 must be thinner than the distance between the ears 531 of the lug 530.
- Gradually tapered top and bottom portions 606a of the point 602 form the other portions of the needle point 602 which converge at the tip 614.
- the slots 604 provide a flat portion 613 with a further tapered curvilinear undercut portions 612 formed towards the tip 614.
- a tapered flat portion 609 is located between the tip 614 and the portion 612.
- Strand holes 603 open onto the portion 612 with the axis of the hole 603 projecting rearwardly at any angle, and preferably about a 30 angle.
- the holes 603 open on the bottom side 615 of the needle 60 which is actually the leading surface wherein the holes 603 cooperate with strand grooves 608 that project rearwardly toward the butt end 601.
- On the upper side 616 of the point 602 are strand slot grooves 607 that project rearwardlyand intersect and cooperate with the slots 605.
- strands 700 from a creel are fed through the strand tensioning device 50 as described hereinabove, and threaded through the needle holes 603, around the point 602 and back through the slots 605.
- An assembled grid box 500 is placed on the feed table 20 so that the grid wall 510 with notches 518 is adjacent the nee dles 60 with the opposite grid wall 520 next to the table 20 with the ears 531 of the lugs 530 projecting towards the table.
- the needles 60 and the needle mount 40 are moved to a full upright, back or withdrawn position above or outside the grid box 500 and exterior to the grid wall 510, similar to FIG. 22.
- the strands 700 from the needles 60 are initially secured to the grid wall 510 in the slot 560, as shown in FIG. 6, by a U-shaped spring clip (not shown).
- initial securing of the strands to the box 500 may employ such simple means as taping the strands to the box, or more sophis- .positioned on table under the first set of pressure holddown roller 70 in such a manner that the pawl 212 contacts the first of the series of rod 550 grooves 552.
- the brake 45 is clamped on the sides of the grid box 500.
- the machine is started by the prime mover with the needles 60 aligned with respect to entering the opening 514 of the grid surface 510.
- the notches 518 align the strands 700, as shown in FIG. 13a.
- the strands 700 are pulled by the needles 60 motion and under substantially equal tension created by the dancer roll 704 in cooperation with the spring tension shaft 706.
- the strands 700 come into contact with the ears 531 and are displaced inwardly from the holes 603 andthe slots 605 toward the web 611, as shown in FIG. 19.
- the strands 700 are automatically pulled back to the normal position, as shown in FIG. 20. This return to the normal position occurs through the cooperative action of the dancer roll 704 and the spring tension shaft 706.
- the strands 700 are hooked or looped on the undercut portions 533 of the ears 531, as shown in FIG. 21.
- the strands 700 are pulled from the grooves 605 and remain in this position throughout the complete backstroke of the machine. Substantially equal tension is maintained on the strands during the backstroke which is completed after the needles'60 have been withdrawn from the grid wall 510, as shown in FIG. 22.
- the pawl 212 engages the next groove 552 and indexes or pushes the grid box 500 forward to the next sewing position; the grid box 500 is prevented from overfeeding by the brake 45.
- the notches 518 align the strands 700 for the next sewing cycle.
- the forward motion of the needles 60 starts to repeat the sewing cycle, and the strands 700 automatically align themselves in the needle slots 605 as a result of the pre-alignment of the strands 700 by the notches 518, as shown in FIGS. 22
- the sewing-indexing operation automatically' proceeds until the strands are sewn in each of the aligned dual passages 514-524 by the row of needles 602.
- the edge rods 550 have been indexed past the table hole 214 so that the pawl 212 contacts the corner bracket 540 as it starts its upward travel.
- the bracket 540 prevents the pawl 212 from completing its predetermined travel thereby causing the switch 210a to stop the machine at the end of the last sewing operation.
- the strands 700 are secured to the grid box 500 by a U-shaped spring clip (not shown) in slots 560; similar to the manner in which the strands were initially secured to the grid box 500.
- the strands 700 are then cut deparating the needles 60 and] the grid box 500.
- this completes the sewing of the grid box in the first of three directions; or in other words, the grid box has strands 700 laced in the X direction.
- the grid box 500 is turned 90on the feed table 20 with the complete sewing operation described hereinabove repeated, thereby completing the sewing of the grid box 500 in the second direction; the grid box 500 i now having strands also in the Y direction.
- the box 500 is turned 90on the feed table 20 with the operations described hereinabove again repeated, thereby completing the sewing of the grid box 500 in the third direction; thus, thegrid box 500 now has strands 700 in the X, Y and Z directions and is capable of use a three dimensional reinforcement.
- the amount of prestressing or tensioning of the strands can be controlled by the force required to pull the strands from their spools on the creel coupled with the cooperative interaction of the dancer roll 704 and the spring tensioned shaft. It has been found that the edge rods 550 and the snap rings 543 may be removed after the three dimensional lattice has been sewn and long as the edge rods 550 define exterior surfaces that are substantially planar forming a box such as a parallele-piped. Since the grid surface openings can be made any desired cross directional configuration, needles having a similar cross sectional configuration can be used therewith. It is also contemplated that the needles can sew one or more strands, as desired.
- any type of strand :inaterial may be used as long as it is sufficiently flexible for the size of the needles and the size of the grid box used. It is also contemplated that the strand material and different sizes of strands may be mixed while sewing the grid in one direction; or, alternatively, the :strands in one direction can be of different size and material than the strands in any other direction.
- A-structure for maintaining a three dimensional lattice array of strands comprising:
- securing with strands in a three dimensional array means comprise lugs with ears on at least one grid wall 5.
Abstract
Description
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US467065A US3884445A (en) | 1972-07-18 | 1974-05-06 | Machine and method for producing a three dimensional lattice |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00272736A US3822463A (en) | 1972-07-18 | 1972-07-18 | Method for producing a three dimensional lattice |
US467065A US3884445A (en) | 1972-07-18 | 1974-05-06 | Machine and method for producing a three dimensional lattice |
Publications (1)
Publication Number | Publication Date |
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US3884445A true US3884445A (en) | 1975-05-20 |
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US467065A Expired - Lifetime US3884445A (en) | 1972-07-18 | 1974-05-06 | Machine and method for producing a three dimensional lattice |
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US (1) | US3884445A (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3322868A (en) * | 1963-07-02 | 1967-05-30 | Douglas Aircraft Co Inc | Three dimensional reinforced structure |
US3778492A (en) * | 1972-04-03 | 1973-12-11 | Mc Donnell Douglas Corp | Fabrication of three-dimensional reinforced foam insulation blocks |
-
1974
- 1974-05-06 US US467065A patent/US3884445A/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3322868A (en) * | 1963-07-02 | 1967-05-30 | Douglas Aircraft Co Inc | Three dimensional reinforced structure |
US3778492A (en) * | 1972-04-03 | 1973-12-11 | Mc Donnell Douglas Corp | Fabrication of three-dimensional reinforced foam insulation blocks |
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Legal Events
Date | Code | Title | Description |
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AS | Assignment |
Owner name: MEMTEC NORTH AMERICA CORP., 250 LEXINGTON AVENUE, Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:BRUNSWICK CORPORATION;REEL/FRAME:004993/0645 Effective date: 19880527 |
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AS | Assignment |
Owner name: MEMCOR, INC. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. EFFECTIVE DATE;ASSIGNOR:MEMTEC NORTH AMERICA CORPORATION, A CORP.OF DE;REEL/FRAME:005450/0051 Effective date: 19880531 Owner name: MEMTEC AMERICA CORPORATION Free format text: CHANGE OF NAME;ASSIGNOR:MEMCOR, INC., A CORP. OF DE;REEL/FRAME:005450/0046 Effective date: 19890101 |