US3789495A - Method for manufacturing box spring - Google Patents
Method for manufacturing box spring Download PDFInfo
- Publication number
- US3789495A US3789495A US00218821A US3789495DA US3789495A US 3789495 A US3789495 A US 3789495A US 00218821 A US00218821 A US 00218821A US 3789495D A US3789495D A US 3789495DA US 3789495 A US3789495 A US 3789495A
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- United States
- Prior art keywords
- frame
- coil
- base frame
- springs
- spring
- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F33/00—Tools or devices specially designed for handling or processing wire fabrics or the like
- B21F33/04—Connecting ends of helical springs for mattresses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27F—DOVETAILED WORK; TENONS; SLOTTING MACHINES FOR WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES
- B27F7/00—Nailing or stapling; Nailed or stapled work
- B27F7/17—Stapling machines
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
- Y10T29/49828—Progressively advancing of work assembly station or assembled portion of work
Definitions
- the frame indexes for another row, and is followed at a controlled interval by a second frame brought into the mechanism automatically from a magazine.
- this special form of coil may be differentiated from others now in common use in that, at its small end, the final convolution terminates in a chordal element which extends across the end convolution approximately diametrically thereof.
- This chordal element or cross bar at the small end of the coil becomes not only the means for positioning and anchoring the coil on the wooden slat frame, but is also the means by which the coil is supported in the assembly apparatus, as well as the reference for orienting the spring coils rotatively so as to position properly the knots at their large ends for later assembly of the supporting face of the box spring construction.
- the flat frame of the box spring is inverted and overhead, the assembly being made in the upside-down condition, the stapling gun with coil thereon being moved vertically upwardly with respect to the slat frame to position the coil thereon for stapling.
- the gun is then fired with sufficient force not only to drive the staple securely into the wood and into encircling engagement with the cross bar of the spring, but also to impress or to indent the cross bar itself firmly into the wood.
- FIG. 1 is a fragmentary perspective view of a box spring construction partially completed in accordance with the invention, showing the spring assembly at one corner of the box spring frame;
- FIG. 3 is a side elevational view of the overall apparatus showing a supply stack or magazine of the slat frames on the right, uppermost one of which is on the ways and in the position at which its leading cross slat awaits a row of springs at the stapling station at the far left;
- FIG. 4a is an elevational view of the stapling mechanism as the operator sees it, i.e., from the right-hand side of the mechanism as seen in FIG. 3, FIG. 4a showing the guns in retracted position and charged with spring coils sufficient for a box spring of less-thanfull width, and showing the overhead ways moved inwardly to accommodate the less-than-full-width slat frame;
- FIG. 5 is a fragmentary perspective view of the stapling mechanism as seen from the operators station, showing in greater detail the gun and its mounting, and the elevating and triggering mechanisms;
- FIG. 7 is an enlarged fragmentary end elevational view of the indexing mechanism seen from the exiting end of the apparatus, i.e., the left hand end as illustrated in FIG. 3;
- FIG. 8a is an enlarged fragmentary elevational view of a portion of the indexing mechanism, showing in particular the mechanism for ejecting a completed assem-
- FIG. 8b is an enlarged fragmentary view of the indexing apparatus showing the controller for the frame ejector of FIG. 8a;
- v FIG. 9 is a diagram of the electrical circuit and controller by means of which the aforementioned individual operations are coordinated inan operating cycle.
- the springcoil 29 is best seen in FIG. 1. It is a somewhat modified cone coil in that its five and one-half convolutions do not decrease in diameter linearly but rather abruptly from the major diameter of the upper knotted convolution 22 to the main body of the coil, which is of substantially smaller and so nearly uniform diameter as to be almost cylindrical in appearance as compared with the usual cone coil. To those familiar with the spring art, it is apparent that this kind of coil exhibits a fairly abrupt change in load carry from an initial softness to a considerable stiffness as the first or closed convolution deflects sufficiently to bring the succeeding convolution of smaller diameter into contact with the load to be supported.
- chordal element of cross bar 26 which is approximately the length of the minor diameter of the coil and is positioned approximately dia metrically of the bottom convolution.
- This chordal cross bar serves a number of purposes, not only in the construction of the box spring itself but also in the handling and the orientation of the coil by the assembly apparatus.
- the spring coil as is indicated in FIG. I, is made so that the cross bar 26 and the knot 28 share a common plane with the central axis of the coil, and when, as later will be described, the muzzles of the guns are arranged to receive the cross barsv of the coils to position them only crosswise of the cross slat 30 of the slat frame 32, it is apparent that the position of the knot 28 at the upper end of the coil must be either on one side or the other of the cross slat 30 or, stated with reference to the direction of movement of the slat frame 32 through the apparatus, must either be fore or aft, i.e., on the leading or trailing edge of the spring.
- each of the peripheral springs presents a smooth unknotted edge of the top convolution for tangential connection to an encircling border wire or frame (not shown).
- the slat frame 32 comprises the leading end slat 30, narrower intermediate cross slats 31, and a trailing end slat 33 (FIG. 8b only). These are nailed to longitudinal side rails 34, the ends slats 30 and 33 each having a second layer 30a and 33a in a common plane with the side rails 34. In frames of greater width than the twinsize frame shown, a center rail would also be provided.
- a particularly unique feature of the gun itself is that its muzzle is equipped with a surrounding sleeve 38 which is preferably of a slippery material such as Nylon, Teflon, or the like, is generally cylindrical in shape and of a diameter slightly less than the minor diameter of the cone coil, and is chamfered or cone shaped at its upper end to facilitate the emplacement of the inverted cone-coil thereupon.
- a surrounding sleeve 38 which is preferably of a slippery material such as Nylon, Teflon, or the like, is generally cylindrical in shape and of a diameter slightly less than the minor diameter of the cone coil, and is chamfered or cone shaped at its upper end to facilitate the emplacement of the inverted cone-coil thereupon.
- each gun is adapted to receive over its muzzle sleeve 38 one inverted coil spring which may be positioned in one of two positions at the discretion of the operator, i.e., with the knots in one of two available positions displaced 180 degrees from one another. It will further be apparent that if some orientation other than a trailing or leading position of the knots were desired, the same may be as well achieved by maintaining the same relative orientation of knot 28 and cross bar 26 as is illustrated in FIG.
- the combination of the cross bar 26 at the bottom or small end of the spring coil and the diametrical seat 40 on the muzzle sleeve 38 of the gun serve to determine the rotative displacement or orientation of the coil, and to maintain that orientation while the coils rise from the loading position of FIG. 4a to the firing position of FIG. 4b.
- FIG. 2 the inverted slat frame 32 is shown positioned for the connection thereto of the second row of spring coils, a first row having previously been stapled to the end or lead ing cross slat 30 of the slat frame.
- the gun 35 in lowered position corresponding to that of FIG. 4a is loaded with a spring coil which is then elevated by upward movement of the gun to the broken line position of FIG.
- the firing of the stapling gun 35 is preferably done with force sufficient to impress or to indent the cross bar 26 at the bottom end of the spring into the surface of the cross slats of the frame, the impact of this force being sufficient also to cause a slight bending of the cross bar in a vertical plane (See FIG. 1).
- the legs 46 of the staples 48 are preferably chisel-shaped so as to be bent into a curved configuration upon entering the wood, thereby to prevent their unintentional dislodgement, and to anchor the springs 20 securely in place.
- the stapling is performed with the springs 20 and the slat frame 32 in an upside-down condition, thus to use the force of gravity to maintain the desired orientation of the individual coil springs with the muzzles 38 of the stapling guns.
- the stapling mechanism illustrating to the far left of FIG. 3 as well as in FIGS. 4a and 4b and 5, is carried on a stationary frame, which comprises a pair of spaced standards 50 which are weldments of steel plate connected together at their upper ends by the cross beam 44, which is of inverted T section, and at their lower ends by cross bracing 52 of any suitable configuration. Above the lower cross brace, the standards are also joined by a tubular manifold 54, which is connected to a source of pressure air, and to which the individual stapling guns 35 are connected by. suitable flexible hoses 56, (FIG. 5) the manifold chamber having a volume sufficient to ensure that the guns will be powered uniformly.
- the guns themselves are mounted upon the recipro cable carriage 36 which includes a pair of slide members 58, one at each end of the carriage, connected by a cross beam 60 upon which the stapling guns are firmly clamped at uniform height in bolted pillow blocks 62.
- Each slide member 58 is movable upon a vertical slide shaft 64 or way which is secured in brackets 65 affixed to the adjacent standard of the frame.
- Each slide 58 is provided on the side opposite the operators position with a rack 66 fixed thereon, and each rack is engaged with a pinion 68 secured to a cross shaft 70 extending between, and journaled in bearings in, the opposed standards 50 of the stationary frame.
- One end of the shaft 70 as seen in FIG. 3 and at the left hand side of FIG.
- a driven pinion 72 which is in turn engaged by a reciprocable rack 74 connected to the piston rod of a double-acting air cylinder 76, the rack 74 being back on its side opposite'its teeth by a roller 77 to take the side thrust of the toothed engagement.
- the guns are connected for unison firing by a common triggering bar 78 which is carried by and therefore moves with the gun carriage 36.
- the bar 78 is a square tube eccentrically mounted at its ends in bearings 79 on the slide members 58 so that when rocked, one of its corner edges engages the trigger 80 of each gun and causes the guns to fire in unison.
- the trigger bar is rotated by means of a doubleacting air cylinder 81 mounted upon the carriage 36, and connected to a crank 82 on the trigger bar, causing the bar to rock when the piston of the firing cylinder is moved.
- the inverted slat frame 32 is not of itself equipped to resist unyieldingly the impact of the staple because, when the guns areelevated to emplace the inverted coils against the downward face of the inverted slat, the thenupward surface of the slat would be out of contact with the upper cross beam 44, and would be supported firmly only under the longitudinal side rails 34 (and center rail when present) of the base frame. (See FIG. 4,7). 'It is, accordingly, desirable to transmit the firm supportof the upper cross beam 44 directly to the cross slats in order to buck the same when the guns 35 are fired.
- the backing bar 42 for bucking the cross slats, and the operating mechanism therefor, are best shown in FIGS. 4a and 4b, and in FIGS. 6a and 6c.
- the backing bars 42 are two in number, one on either side of the central feeding or indexing mechanism 83 by means of which theslat frame 32 is advanced through the apparatus.
- Each backing bar 42 is positioned in a slot 84 (FIG. a) in the flange of the inverted cross beam 44, and by means of lugs 86 is reciprocably mounted upon a pair of capped posts 88 each screwed into the upper side of the girder flange.
- the backing bars 42 are normally maintained in an upper or retracted position on the cross beam 44 by means of compression springs 90 which encircle the posts 88. When retracted, the lower edges of the bars 42 provide ample clearance for the passage therebeneath of the cross slats of the slat frame 32 as the same are being advanced by the indexing mechanism 83 with the ends of the cross slats 30 resting upon the angle-iron frame ways 92 seen-in section in FIGS. 40 and 4b, and in side elevation in FIG. 2 and in the several FIGS. 6.
- cam levers 94 To bring the backing bars 42 into supporting contact with the upper surface of a cross slat to resist the driving force of the staple, four cam levers 94, two for each backing bar, are ganged to a connecting rod 96 which in turn is pivotally connected to the clevis of the piston rod of a double-acting air cylinder 98 mounted at one end of the upper cross beam 44.
- the extension of the piston rod of the cylinder causes the connecting rod 96 to move from left to right, as there seen, rotating the several cam levers 94 clockwise to cam the backing bars 42 downwardly into backing contact with the cross slat of the frame.
- the drive cylinder 98 for the backing bars 42 is connected to the operating valve that controls the drive cylinder 76 for elevating the gun carriage, so that pressure air is admitted to both simultaneously;
- the ways 92 upon which the slat frame 32 advances through the apparatus are adjustably mounted upon the flange of the cross beam 44, being suspended therefrom on brackets 100 that are adjustably clamped to the flange by means of set screws (H6. 2).
- the backing bar 42 is made adjustable in length by providing it with segmental engaging elements or shoes 102, which are attached to the reciprocable backing bar 42 by means of screws and which permit the convenient removal of a sizeable portion of the engaging edges of the bars to accommodate the twin size frame, or the complete replacement and substitution of different shoes in the event that other widths or slats arrangement of base frames is employed.
- the positions of the guns on the movable gun 36 can likewise be adjusted to control the intercoil spacing, as may be desired to accommodate other than the major sizes of box springs which will occu'py the greater portion of the operating time of the apparatus.
- a stack or magazine 103 of prefabricated slat frames 32 is supported upon a scissors elevator 104 which is operated on call by hydraulic power to elevate the stack of frames one frame thickness at a time to bring a new frame to the level of the frame ways 92 and into the operating range of the feed pawls of the indexing mechanism 83 after the preceding frame has advanced sufficiently to clear the leading edge of the stack.
- the stack elevator 104 is operated automatically by control meansyet to be described.
- the frame ways 92 extend from the magazine 103 to the stapling station, being supported at their rearward ends, adjacent the feed stack, by an upright frame comprising a pair of side columns 106 connected at their upper ends by upper cross beams 107 and 108, and a lower cross beam 109.
- Upper cross beam 108 and lower cross beam 109 are connected by numerous vertical filler rails (not shown) which constitute an abutment against which to emplace the stack 103 fo slat frames, whose side edges are guided by posts 110 on the frame elevator 104. They also support the control box 111.
- the entering ends of the frame ways 92 are supported on a slide shaft 112 secured in brackets near the upper ends of the columns 106, the connections of each way to the shaft 1 12 being made by a bracket (not shown) that is secured to the way and adjustably locked in place on the slide shaft 112 by a set screw.
- the frame ways 92 extend for wardly to the front edge of the stapling mechanism support standards 50 from which point the inverted slat frame, after having received its coils, is transferred to extension ways (FIG. 8a only) from which to be removed in any convenient manner for further operations.
- the indexing mechanism 83 is the most complicated part of the apparatus and is shown in FIGS. 3, 4, the several FIGS. 6, and also in both FIGS. 8.
- It consists essentially of double-acting double-ended air cylinder 114 whose reciprocable piston rod 116 is suitably extended and fitted with three depending feed dogs or pawls 118, 120 and 122, of which the pawl 118 is normally inoperative, being called into operation only once for each frame to eject the frame from the apparatus upon the completion of the stapling of a row of coils on the last cross slat 33 of the frame.
- the drive cylinder 114 is mounted on the back side of cross beam 44 of the stapling mechanism, i.e., on the exiting side of the stapling station.
- a bracket 124 from which the intermediate feed pawl 120 is suspended, and which also serves as a coupling for an extension rod 126 at the extreme rearward end of which there is similarly mounted a corresponding bracket 128 from which the rearward feed pawl 122 is suspended.
- the extension rod 126 is supported in a slide bearing 107(a) in the upper cross beam 107.
- valve controlling the operation of the drive cylinder 114 is energized by the automatic controller, causing the piston rod 116 to be extended to its retracted position shown in FIG. 3, and then almost immediately, as in a continuous operation, to move forwardly causing the intermediate feed pawl 120 to engage a cross slat of the slat frame then on the ways, and to move that cross slat forwardly to the stapling station.
- the rearward feed pawl 122 either assists in that feeding action during the time when both pawls are operative upon a single frame, or at times causes the rearward feed pawl 122 to engage a cross slat of the next frame of the magazine 103 to move it onto the frame ways 92.
- the intermediate and rearward feed pawls 121 ⁇ and 122 are simply bars pivoted on a horizontal axis in their respective mounting brackets, chamfered at their front edges to match the generally vertical rearward edges of the cross slats of the slat frame 32, and urged by gravity to the operative position at which they are stopped by the engagement of their rearward ends with an abutting surface of their mounting brackets.
- the feed pawls 120 and 122 ride freely over the next rearward cross slat of the frame, falling into position poised for the next feed movement (See dotted line position FIG. 6c).
- FIG. 6a That portion of the indexing mechanism which serves to position the cross slat accurately for the receipt of a row of coils is shown in detail in the several FIGS. 6.
- the leading cross slat 30 of the frame which is wider than all of the intermediate cross slats 31 of the frame, is positioned at the stapling station to receive its row of coils.
- the feed pawl 1211 under the driving force of the air cylinder 114, has moved the leading edge of the slat frame firmly against a pair of positioning stops 130, each adjustably secured to one of two rock shafts 132 journalled in hearings on the upper side of the flange of the cross beam 44.
- the rock shafts 132 are also shown in FIG.
- FIG. 7 which also illustrates the torsion springs 134 by means of which the rock shafts are normally biased to lift the stops 130 out of the frameengaging position (FIG. 6b).
- the rock shafts flank the indexing cylinder 114, and each is rocked by its own separate crank 136 engaged by the cam end of a push rod 138.
- the pair of push rods 138 flank the piston rod 1 16 of the cylinder 114, and extend through slide bearings in the web of the T-shaped'cross girder 44 to hearing blocks 140 secured to sides of a central channel member 142 cantilevered rearwardly from the web of the cross girder 44.
- the push rods 138 are postioned so that their chamfered or cammed front ends are poised to contact the roller of the rock-shaft crank 136 when the feed mechanism is in the retracted position.
- a compression spring 146 surrounding the push rod between the push block 144 and the web of the cross girder 44 (FIG.6b).
- thepush rods 138 are advanced to the position of FIGS. 6a and 6c, the cam ends of the rods turning the cranks 136 to rotate the stop 130 to its depending position at which to intercept the leading edge of the frame 32.
- the push rods 138 are advanced by cross pins 148 extending sidewardly from the bracket 124, which on the fully retracted stroke of the piston rod 116, is positioned well to. the rear of the push blocks 144.
- the push blocks 144 are in sliding contact with the sides of the support channel 142 to prevent the turning of the rod 138 on its own axis while it reciprocates (Compare FIG. 4 and 6).
- the frame stops are actuated on every feed stroke 'of the machine, but as it depends from the rock shaft only sufficiently to engage the upper layer 3% of only the leading cross slat, it is in fact inoperative and of no consequence during the indexing of subsequent cross slats 31 and 33 of the frame.
- the upper frame stop 130 For the second and all succeeding cross slats of an individual base frame, the upper frame stop 130, as earlier indicated, is ineffective, and a second frame stop 150 is therefore provided, insertable through a notch or slot 152'through the supporting flange of the frame ways 92 from the under side thereof at the appropriate time to intercept the forward edge of thesecond and all succeeding cross slats of the frame.
- FIGS. 6a, 6b and 6c show not only how the lower frame stop 150 serves its function, but also how it is selectively .disabled for the passage of the leading cross slat 30 of theslat frame.
- the lower frame stop 150 is shown in operative position in FIG. 60 engaged with the forward edge of the second cross slat 31 which is firmly seated against it by the intermediate feed pawl 120 of the indexing mechanism.
- the lower frame stop is essentially hook-shaped and pivotally mounted on the underside of the frame way 92 to be rocked by a crank 154 into and out of frame-engaging position under the influence of an air cylinder 156 mounted on a bracket 157 secured to the way 92.
- the stop-actuating cylinder 156 is singleacting, having a self-contained spring (not shown) which tends to extend the piston rod so as to retract or withdraw the lower frame stop from engaging position.
- the cylinder is operated by a solenoid valve under the influence of a normally open switch 158 which is mounted on the support channel 142 and positioned to be operated by a cam bar 160 on the upper surface of the mounting bracket 124 of the intermediate feed pawl 120.
- a normally open switch 158 which is mounted on the support channel 142 and positioned to be operated by a cam bar 160 on the upper surface of the mounting bracket 124 of the intermediate feed pawl 120.
- a second and normally closed switch 162 is mounted on the upper side of the flange of the cross girder 44 with its operator positioned to be intercepted by the upper portion 30a of the leading cross slat of the frame. That switch is in series with the normally open switch 158. When that switch is operated as indicated in FIG. 6a,'the switch 162 is opened, rendering it impossible to close the control circuit to the valve controlling the lower frame stop 150. Therefore, as long as the switch 162 indicates the presence of the leading cross slat 30, the lower frame stops 150 remain inoperative, and the leading edge of the frame advances to the upper stop 130.
- trailing cross slat 33 is the mirror image of the leading slat 30, i.e., with the upper thickness thereof disposed at the right-hand side or trailing edge of the last cross slat, it is not in a position to actuate the switch 162 before the leading edge of the trailing slat contacts the lower stop 150, and therefore is of no effect in disabling the lower frame stop 150 for the interception of the last or trailing cross slat 33 of the frame.
- Both the sensing switches 164 and 166 are of the normally closed type, and are wired in series with the elevator motor starter so that the closing of both is required to call the elevator into operation.
- a circuit is finally completed through both switches, and the stack begins to rise until the rearward switch 166 is once more operated to open the circuit.
- the uppermost frame of the stack is then at the level of the frame ways 92, and on the next indexing movement opens the forward switch 164 as well.
- the spacing of the two sensing switches 164 and 166 controls the spacing between successive slat frames, which is .set at a distance slightly in excess of the normal interslat spacing'so as to allow for the greater width of the leading slats of the frame.
- the increment of movement is the length of the feed stroke of the indexing mechanism
- the interframe spacing will be the length of the feed stroke or some multiple thereof, determined by'the placement of the forward switch 164 along the frameway.
- One feed stroke is sufficient for the purpose, which is in part to permit the intermediate feed pawl to drop into position behind the last or trailing cross slat 33 of the frame so as to thrust it forwardly to the stapling station.
- the ejector pawl 118 is a forward extension of the indexing mechanism 83.
- feed pawl 122 are urged by gravity to a depending operative position, always either engaged with-or poised for engagement with a frame cross slat except during the retracting stroke, on which those slats are overriden, the forward ejector pawl 118 is normally inoperative, being lifted and maintained out of frame engaging position by a small single-acting air cylinder 170.
- the pawl itself is pivotally suspended from a bracket 172 affixed to the forward end of the piston rod 116, and by its unbalanced weight is urged to the broken line frame engaging position of FIG. 8a.
- a return spring (not shown) which is within and part of the air cylinder 170 which is mounted on the forward face of the pawl bracket 172 and has attached to its downwardly extending piston rod a lifting arm 174 which is pivotally connected to the pawl 118 by a pin-and-slot connection 176 within a recess 178 milled in the pawl forwardly of its main pivotal mounting.
- the air cylinder 170 When the air cylinder 170 is energized, therefore, the ejector pawl 118 is lifted and maintained in its elevated position, where it remains idle throughout the normal operation of the indexing mechanism, air being constantly supplied to the cylinder 170 except when the last or trailing cross slat 33 of the frame is positioned at the stapling station (and fleetingly and ineffectively during the arrival of the leading cross slat 30 at the stapling station).
- the control of the forward ejector pawl 118 is effected by a small air valve 180 through which pressure air is normally applied to the cylinder 170.
- the valve is mounted on a bracket 182 screwed to the flange of the cross beam 44 and positioned so that its operating leaf 184 will be lifted by the upper layer 33a of the trailing cross slat 33 when the latter is positioned at the stapling station.
- the valve is operated by lifting the operating leaf 184 the connection. to the pressure source is interrupted and the cylinder is vented to atmosphere through the valve body.
- the feed pawl 110 is correspondingly depressed to the broken-line, slat-engaging position of FIG.
- the pawl 110 overrides and falls behind one of the intermediate cross slats 31 of the completed frame, and on the forward stroke removes it from the stapling station.
- the former is provided with a forwardly extending lower lip which maintains the engagement of the ejector pawl with the cross slat with the completed frame throughout the ejection stroke. If the extension ways 188 (P16.
- valve 180 is operated by the passage thereunder of the upper layer 33a of the trailing slat 33, it will be apparent that it is similarly lifted by the upper layer 30a of the leading slat 30, but only momentarily as will be apparent from comparison of FIG. 6a, which illustrates the leading cross slat at the stapling station, with FIG. 8b, which shows the trailing cross slat similarly so positioned.
- FIG. 6a which illustrates the leading cross slat at the stapling station
- FIG. 8b which shows the trailing cross slat similarly so positioned.
- the ejector pawl 118 is momentarily but idly positioned in the broken-line position of FIG. 8a as the intermediate feed pawl moves the leading cross slat 30 into the stapling station.
- a motordriven industrial timer 111 Central to the operation of the circuit is a motordriven industrial timer 111, the elements of which are enclosed within the broken line of FIG. 9. They include a timing shaft 190 driven by a motor 191 which is placed into operation by an initiating manual switch 192 which is preferably a pedal-operated switch at the operators position in front of the stapling station, and a holding switch 194 operated by a cam on the motordriven shaft. The holding switch continues to apply power to the driving motor when the initiating manual switch 192 is released, holding the motor in for essentially one revolution of the shaft after which the holding switch 194 opens, de-energizes the motor, and thus determines the length of an operating cycle.
- an initiating manual switch 192 which is preferably a pedal-operated switch at the operators position in front of the stapling station
- a holding switch 194 operated by a cam on the motordriven shaft.
- the holding switch continues to apply power to the driving motor when the initiating manual switch 192 is released, holding the motor in for
- cam-operated switches 196, 197, and 198 controlling respectively the solenoid valves 200, 201, and 202 which control respectively the air cylinder 76 which elevates the gun carriage, and with it the air cylinder 98 which depresses the backing bars, the latter two being controlled in common by the valve 200, the air cylinder 81 which rocks the trigger bar to fire the guns, and the air cylinder 11 that powers the indexing mechanism 83.
- the cam-operated or timing switches 196, 197 and 198 are each connected to their respective controlled solenoid valves through one of three manually operated threepole switches 203, 204 and 205 the lower contacts of which must be closed to render the automatic controller operative.
- a fourth manually operated three-pole switch 206 serves essentially to condition the slat frame magazine 1035 for automatic operation.
- timing motor 191 is connected to power through the lower set of contacts of each of the aforementionedlmanually operated three-pole switches 203 to 206, inclusive, requiring that all such contacts be closed before the timing motor may be energized, and also that the circuit to the timing motor is interrupted if any of those contacts should be opened.
- a third set of contacts of each of the four triple-pole switches 203, 20 i and 205 operate signal lamps 207, 208, 209 and 210 to indicate that the timer switches 196, 197 and 198, the elevator 104, and the timer motor 191 are conditioned for operation.
- the timer shaft 190 commences to turn causing, successively, the guns 35 to elevate as the backing bar 42 comes down, the trigger bar 78 to rock and to fire the guns, the guns to retract, and the slat frame 32 to index in preparedness for the beginning of the next cycle.
- Each of the air cylinders 76, 98, 81 and 114 controlling these four basic movements is a double-acting cylinder and, accordingly, the solenoid valve which controls each is a two-position springreturn valve which normally applies pressure air to one side of the operating piston while venting the other, but reverses that condition when the controlling timer switches 196 to 198 are closed to power the valve solenoids.
- the air cylinders 156 that operate the lower frame stops 150 are of the single acting type, as earlier mentioned, and spring-biased to retract the lower frame stops from their frame engaging positions (FIG. 6b).
- the valve 212 which controls the cylinder 156 is itself controlled by the earlier-mentioned normally closed switch 162 mounted on the upper surface of the cross beam 44. These two switches, as shown in FIG. 9, are connected in series and when closed cause the admission of pressure air to the cylinder 156 to elevate the lower frame stop.
- the normally open 158 switch is closed after cross indexing stroke has proceeded sufficiently to permit the preceding cros slat to clear the stapling station, so that the lower stop 150 may resume its position without obstruction.
- the two normally closed switches 164 and 166 which energize the drive motor of the hydraulic lift mechanism 104 of the frame magazine 1033, are connected in series to the drive motor through the same set of contacts of the switch 206 that light the signal lamp 210, the switch 206 thus interlocking the elevator 104 with the timer motor 191.
- the removal of one slat frame from the top of the magazine 103 permits the switch 166 to close, and when the trailing edge of that frame has finally cleared the forward switch 164, the elevating motor is energized, lifting the stack 103 until its uppermost frame again opens the rearward switch 166.
- the elevator proceeds to its maximum height at which point, with the hydraulic ram fully extended, its pump bypasses until the operator shuts it off. This he does by manually operating the triple pole switch 206, the middle contactor of which is connected for double-throw operation, and applies power to a solenoid to open a valve 214 which vents the hydraulic lift cylinder to its sump permitting the elevator 104 to descend to be recharged with a new stack.
- Each of the solenoid valves 200, 201 and 202 may likewise be operated individually by manual switches 216, 217, and 218 respectively, for testing and maintenance.
- the entire control circuit is connected to power through a double-pole single throw switch 219, both lines to which are appropriately fused in accordance with conventional practice.
- the weight of the individual coils as the method of maintaining their orientation with the stapling gun and thus to perform the stapling with the stapling guns pointed upwardly, and with the springs and the slat frames upside down.
- the indexing mechanism by means of which the slat frame is fed to the stapling apparatus one slat at a time is such as to square" the at at the stapling station to assure that the springs are attached in a line parallel to the slat edges, and, in the case of the intermediate slats, centrally thereof.
- the springs employed are coil springs having a wire portion extending as a choral element into an end convolution of the coil, and the coil is placed over the end of its associated gun so that the gun extends into the interior of the coil with the end of the gun engaging the chordal element and oriented rotatively with respect thereto so that the chordal element is the wire portion straddled.
Abstract
Description
Claims (10)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US21882172A | 1972-01-18 | 1972-01-18 |
Publications (1)
Publication Number | Publication Date |
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US3789495A true US3789495A (en) | 1974-02-05 |
Family
ID=22816648
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00218821A Expired - Lifetime US3789495A (en) | 1972-01-18 | 1972-01-18 | Method for manufacturing box spring |
Country Status (1)
Country | Link |
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US (1) | US3789495A (en) |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997044275A1 (en) * | 1996-05-24 | 1997-11-27 | L & P Property Management Company | Machine and method for applying border clips |
US5699998A (en) * | 1993-02-01 | 1997-12-23 | Zysman; Milton | Manufacture of pocket spring assemblies |
US6315275B1 (en) | 1995-09-18 | 2001-11-13 | Furniture Row Technologies, Llc | Pocket spring assembly and methods |
US6374495B1 (en) | 2000-03-14 | 2002-04-23 | Stanley Fastening Systems | Apparatus and method for securing borderwires to mattress innersprings |
US20030098327A1 (en) * | 2001-11-29 | 2003-05-29 | Durkos Larry G. | Box spring stapler apparatus |
US20030154589A1 (en) * | 2002-02-21 | 2003-08-21 | Denver Mattress Co. Llc | System and methods for constructing box spring/foundation frames |
US6698166B2 (en) | 1995-09-18 | 2004-03-02 | Springquilt Industries Ltd. | Pocket spring assembly and methods |
US20050055815A1 (en) * | 2003-09-16 | 2005-03-17 | Scott Giett | Method and apparatus for securing a border wire on a mattress inner spring |
US20050218187A1 (en) * | 2004-04-05 | 2005-10-06 | Brown Christopher T | Stapling device |
US20050251981A1 (en) * | 2004-04-09 | 2005-11-17 | Mossbeck Niels S | Positioning device for staple guns and method of use |
US20060011696A1 (en) * | 2004-04-09 | 2006-01-19 | Mossbeck Niels S | Positioning device for staple guns and method of use |
US20060112366A1 (en) * | 2004-11-20 | 2006-05-25 | Cadence Design Systems, Inc. | Method and system for optimized automated IC package pin routing |
US20060265850A1 (en) * | 2005-05-13 | 2006-11-30 | Rowe Brian A | Automatic box spring fastening apparatus |
US7222402B1 (en) | 2001-11-29 | 2007-05-29 | Imaginal Systematics, Llc | Box spring stapler apparatus |
US7574788B1 (en) | 2004-10-01 | 2009-08-18 | Atlanta Attachment Company | Foundation cover stretching and stapling system |
US11304535B2 (en) * | 2018-05-31 | 2022-04-19 | L&P Property Management Company | Machine and method for assembling a bedding foundation |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5699998A (en) * | 1993-02-01 | 1997-12-23 | Zysman; Milton | Manufacture of pocket spring assemblies |
US6698166B2 (en) | 1995-09-18 | 2004-03-02 | Springquilt Industries Ltd. | Pocket spring assembly and methods |
US6315275B1 (en) | 1995-09-18 | 2001-11-13 | Furniture Row Technologies, Llc | Pocket spring assembly and methods |
WO1997044275A1 (en) * | 1996-05-24 | 1997-11-27 | L & P Property Management Company | Machine and method for applying border clips |
US6374495B1 (en) | 2000-03-14 | 2002-04-23 | Stanley Fastening Systems | Apparatus and method for securing borderwires to mattress innersprings |
US7467454B2 (en) | 2001-11-29 | 2008-12-23 | Imaginal Systematics, Llc | Box spring stapler apparatus |
US20030098327A1 (en) * | 2001-11-29 | 2003-05-29 | Durkos Larry G. | Box spring stapler apparatus |
US7222402B1 (en) | 2001-11-29 | 2007-05-29 | Imaginal Systematics, Llc | Box spring stapler apparatus |
US20050210647A1 (en) * | 2001-11-29 | 2005-09-29 | Durkos Larry G | Box spring stapler apparatus |
US6935546B2 (en) * | 2001-11-29 | 2005-08-30 | Imaginal Systematics, Llc | Box spring stapler apparatus |
US6757956B2 (en) * | 2002-02-21 | 2004-07-06 | Denver Mattress Co., Llc | System and methods for constructing box spring/foundation frames |
US20030154589A1 (en) * | 2002-02-21 | 2003-08-21 | Denver Mattress Co. Llc | System and methods for constructing box spring/foundation frames |
US20050055815A1 (en) * | 2003-09-16 | 2005-03-17 | Scott Giett | Method and apparatus for securing a border wire on a mattress inner spring |
US20050218187A1 (en) * | 2004-04-05 | 2005-10-06 | Brown Christopher T | Stapling device |
US7014088B2 (en) * | 2004-04-05 | 2006-03-21 | Brown Christopher T | Stapling device |
US7490401B2 (en) | 2004-04-09 | 2009-02-17 | L&P Property Management Company | Positioning device for staple guns and method of use |
US20060011696A1 (en) * | 2004-04-09 | 2006-01-19 | Mossbeck Niels S | Positioning device for staple guns and method of use |
US20050251981A1 (en) * | 2004-04-09 | 2005-11-17 | Mossbeck Niels S | Positioning device for staple guns and method of use |
US7516533B2 (en) | 2004-04-09 | 2009-04-14 | L&P Property Management Company | Positioning device for staple guns and method of use |
US7574788B1 (en) | 2004-10-01 | 2009-08-18 | Atlanta Attachment Company | Foundation cover stretching and stapling system |
US20060112366A1 (en) * | 2004-11-20 | 2006-05-25 | Cadence Design Systems, Inc. | Method and system for optimized automated IC package pin routing |
US20060265850A1 (en) * | 2005-05-13 | 2006-11-30 | Rowe Brian A | Automatic box spring fastening apparatus |
US7562443B2 (en) | 2005-05-13 | 2009-07-21 | Rowe Brian A | Automatic box spring fastening apparatus |
US11304535B2 (en) * | 2018-05-31 | 2022-04-19 | L&P Property Management Company | Machine and method for assembling a bedding foundation |
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