US2351923A - Method and device for manufacturing spring nets for mattresses, seat cushions, and the like - Google Patents

Description

June 20, 1944. H. BUTTNER 2,351,923

METHOD AND DEVICE FOR MANUFACTURING SPRING-NETS FOR MATTRESSES, SEAT-CUSHIONS, AND THE LIKE 5 Sheets-Sheet 1 Filed June 4, 1942 une 20, 1944. BUTTNER 2,351,923

METHOD AND DEVIC OR MANUFACTURING SPRING-NETS FOR MATTRESSES, SEAT-CUSHIONS, AND THE LIKE Filed June 4, 1942 3 Sheets-Sheet 2 June 20, 1944'; H BUTTNER 2,351,925

METHOD AND DEVICE FOR MANUFACTURING SPRING-NETS FOR MATTRESSES, SEAT-CUSHIONS, AND THE LIKE Filed June 4, 1942 3 Sheets-Sheet 3 Patented June 20, 1944 METHOD AND DEVICE FOR MANUFACTUR-y ING SPRING NETS FOR MATTRESSES, SEAT CUSHIONS, AND THE LIKE Hugo Biittner, Wuppertal-Vohwinkel, Germany;

' vested in the Alien Property Custodian Application June 4, 1942, Serial No. 445,792 In Germany January 29,1941

6 Claims. (01. 140-3) Spring-nets for mattresses, seat-cushions and the like have hitherto been manufactured in thatthe individual springs have been wound into one another by hand. This manual work is of course comparatively expensive.

The object of the present invention is to carry out said winding operation mechanically, whereby the manufacture of spring-netsof the kind stated, especially double springs, can be carried out speedier and in a simpler manner.

According to invention the method adapted is that the spring to be interwound with an adjacent spring is wound up a mandrel having a smaller diameter than the mentioned spring, over which the adjacent spring in its untensioned state is placed.

The device according to invention for carrying out this method comprises upwardly and downwardly controlled winding mandrels protruding through a cover plate. Their upper ends having recesses adapted to take the ends of the rection of the spring said recess is formed on the one hand by a bolt arranged at the rim of the frontal face of the mandrel, and on the other hand by an oblique jaw likewise arranged on the rim of said frontal face.

The unwound piece of spring wire must be kept tensioned during the winding operation. This is effected according to the present invenmanner that it can recede when the winding process is completed.

When manufacturing 'a. single spring the end thereofmust be provided with a loop, therefore, according to invention, the one knife jaw of the cutting device can be concentrically moved about the forming bolt for the'spring loop, thus bending of" the loop and cutting-01f takes place simultaneously.

The object of invention is shown schematically in the drawings, and show as follows:

Figs. 1-6 the method for the manufacture of a spring-net consisting of double springs,

tion with the aid of stops provided laterally in front of the winding mandrels against which the unwound piece of spring wire bears.

' In order to render possible the manufacture of a double spring there are according to this invention two winding mandrels provided and situated remote from another by a distance correspending to the diameter of a finished spring,

vention, of a disk detachable from the cover plate and having a diameter corresponding. to the space between the winding mandrels and having upon its axle a gripper arm to. take hold of the spring wire.

In order to prevent the stop pertaining to the second winding mandrel from constituting an obstacle during the winding procedure it'is designed, according to this invention, in such a Fig. 7-14 the method for the manufacture of single springs, Q I

Fig. 15 is a plan view of the device,

Fig. 16 a side view of Fig. 15,,

Fig. 17 a diagrammatical representation of the winding procedure,

Fig. 18 a plan view of the parts serving to bend the loop at the end of a single spring,

Fig. 19a finished double spring.

Fig. 20 a finished single spring.

In Figs. 1-3 and 7-10 is illustrated the manuthe second row of the net with the first row. When manufacturing. a spring-net of double springs two mandrels a: and'y (Figs; 1-6) are used, and when making a spring-net of single springs (Figs. 7-14) only one mandrel u is employed. These mandrels revolve about their longitudinal axis in a clockwise and in an anticlockwise direction, and are supported in a machine frame in which they can move upward and. downwardly.

In the following the method of manufacturing a spring-net according to Figs. 1-6 is described. The mandrels a: and y are firstly in their lowermost'position, then each receives one end of the wire which has been bent to resemble a hair pin and finally constitutes the double spring I and 2; The mandrels then grip the ends and revolve in an anticlockwise direction, moving upwardly simultaneously. Coinciding with the mandrels gripping the wire ends the loops at and b are bent and formed. By reason'of the rotation and upward motion of the mandrels the wire is helically wound upon them. Thereafter the mandrels move downwardly and the loops a and b become disengaged from the gripping device whereby the springs l and 2 are untensionedso that'they assume relatively to the mandrels a: and y the position of springs I and 2 shown in- Fig. 1. That is encompassing the mandrels in an untensioned state.

Now the spring .2- is laid around the mandrel a:

and double spring 3 and 4 is wound around the' mandrels a; and y in the same manner as de- 6 scribed above.

Simultaneously wit h laying the spring 2 .over mandrel a: the loops a and bean be interhooked with one another.

The spring 3 which is adjacent to spring 2 and isto be interwound with it, is therefore wound around mandrel a: over which the adjacent spring 2 has been placed in an untensioned state, whereby the spring 3 is compulsory wound into spring 2.

Thereupon the spring, 4 is conveyed onto mandrel z in an untensioned state, then the springs l5 3 and 4 are interhooked; spring 5 is then wound around mandrela: and spring his wound around mandrel 11, whereby springs 4 and 5 which lie adjacent to one another. are compulsory interwound.

The springs 3' and 5 have of course the same diameter as all other springs, although their diameter as shown in the drawings is smaller, but

this has been done merely for the purpose of clearness. This applies also to all other springs 25 having a smaller diameterv and shown located within larger springs. v

In the above described manner it is rendered possible to produce series ofsprings of any desired length. In order toconn'ect the springs "of the second row with the springs of the first row the operation proceeds as follows! Firstly the springs 2 and 2 of the first row are placed upon the mandrels 2c and 1! in an unten-e sioned state, whereafter the double spring 8, I0, is wound upon said mandrels inexactly the same manner as has been described with reference to Fig. 1 whereby the springs 2 and}, or 2 and ill respectively, will-be interwound, they may then be drawn apart, compare Fig. 5.. Now spring ll must be interwound with spring II, as well as 1 with spring 4. For this purpose the springs 4 and 5 are placed upon the mandrels :c and u in an untensioned state, furthermore, the spring 10 adjacent to spring ll likewise in-untensioned state is placed upon mandrel a: in that this spring is drawn over in the direction indicated by arrow 2. This can be done without any difficulty since the springs concerned can be easily shifted relatively to one another, as none of them are rigidly connected with any adjacent springs, but only interwound with same. Now the springs and I2 are wound upon the III and spring I2 is wound within the'spring-l. When the springs are then drawn apart, .the spring II will be interwound and 4 and spring withuthe pring l2.

The interwinding of springs I3 and I4 is again I effected in the same manner, that the springs 4 and 1 are placed upon the-mandrels a: and 1: in

an untension'ed state, furthermore by drawing 5 spring I2 over onto mandrel :c in the: direction indicated'by the arrow zithe springs I 3 and 1 4 being then woimd around the mandrels sand 1 This working procedure can be continued in the manner stated until a spring-net of the desired 70 length and width has been manufactured. The

springs projecting at the rim, as for instance the springs I and 8 can be inserted into the adjacent springs in order to reinforce the rim springing,

or single springs are'woundinto the intermediandrels a: and 1! in exactly the same manner as above described, so that spring H is wound within the springs 4 and th the springs I! m ate spaces and connected with the adjacent springs or with the frame. The manufacture of a spring-net of single springs is effected in a similar, but far simpler manner, compare Figs. 7-14. In this case only one mandrel u is employed which however, operates in exactly the same manner, as for example the mandrel a: in Figs. 1-6. Firstly the spring i is produced with the aid of said mandrel a. This spring remains on the mandrel u. 'in an untensioned state, and into it is wound the spring I 2, whereby spring 2 will be'interwound with the spring I. Then the spring 2 is placed upon'mandrel u and spring 3 is wound around this man; drel which is then interwound with spring 2. The same takes place with a spring 4 (see Figs. 9 and 10). In this manner it isrendered possible to produce a row of springs having any desired lengths and interwound with each other.

In order to render, it possible to manufacture the secondrow of springs the operation is car- 'ried out in a similar manner as described in'res pect to double springs. First of all spring I is again placed {onto the mandrel at (Fig) 11) then spring 5 is wound around mandrel u, that is-to say, into spring I, whereby the springs l and I will be interwound (Fig. 12). Now the spring '4 must be interwound with spring 2, as well as with spring 5. For 'this purpose, not only spring 2 is placed onto mandrel u, but also the spring i is drawn over thismandrel in the direction indicated by arrow .2. Then this spring is wound upon mandrel u, and in this manner spring 8 ,is

interwound with the springs i and! (Fig. 13)..

has previously had spring 4 and spring I placed upon it in an untensioned state.

Interconnecting of the loops a and b, Figs. 1-6,

'can be effected at any desired point of time. 'In

Figs. 1-3 itis eifec [d immediately after the spring concerned has been withdrawn from the mandrel; in- Figs. 4-6 it is eflectedin a similar manner but one process section later, viz. after the springs of the second row have likewise been withdrawn from the mandrel.

The device for manufacturing the spring-net is constructed as follows:

Covering plate. ii is provided with appr priate apertures through which the mandrels a: and-11 pass. "(A section of each mandrel is designed as pinion 24 which engages ,with a toothed segment 28 driven by means-ofconnecting-rod 26 and.

crank 21 from shaft 28. The ends 24 of the winding mandrels z and y are. designed as worms "in which a guide pin 2| engages and upon which the mandrels are given an upward and downward motion. 1

0n the frontal face 325 of the winding mandrels a bolt pin ll and an oblique iaw I4 arefitted which grip the end of the spring. Thebolt 23, as well as said jaw 34 are situated immediately at the rim of frontal face 22. In front-of mandrels x and v and on the covering plate 2| two stops ii and" are fitted for the wire piece that has-not yet been wound. stop I! is movplate 4|.

to the distance between winding mandrels a: anddrels a: and 1/.

Theloop I2 (Fig. 17) "not yet wound inthe able in the direction indicated by arrow 31 the stop 36 is rigidly fitted to this plate.

On the cover plate 2| and in front of the mandrels a: and y a bending device is arranged consisting of a disk 38 which with its axle 39' fitted in support-bearing 40 carries a bridge-. The diameter of disk 40 corresponds y. On axle 39 a cog wheel 42 is also fitted, which is driven from-shaft 28 by the intermediary segment 43 and with the aid of a pair of levers 44, 45 .and an eccentric 46. The cog wheel 42 is rigidly connected with a lug 41 carrying a pin 43.

The disk 33 can'be raised from cover plate 2| by means of bolt 49,in that an arm 5| of a double armed lever 5|, 52 be actuated by an eccentric on axle 28,, and bears against the axle 49. i The manner of operation -of this device is as follows:

Firstly the method of producing a. doublespring is to be described. The wire to be operated is drawn from a roll and conveyed forward by means of rollers 53 and 54, rotating in the direction of the arrows immediately in front of winding mandrel y. The conveying rollers are driven by means of a pawl 55, actuated from the shaft 28 by intermediary levers 56, 51 and crank 58, said pawl 55 engaging with the'ratchet teeth provided on the circumference of wheel 50 located on conveyer axle 59.

After the length of wire requisite for manufacture of a double spring has been fed forward it is cut off between a rigid knife Bi and a movable knife 62 actuated by lever :53 sliding in an eccentric curve 64 after said piece of wire has been cut off, lug 41 is moved in the direction indicated by arrow 65 and bolt 48 bends the wire 65 round the disk 38 giving it a hair pin bend. When this has been effected the bending device is lifted off from the cover-plate, whereby the levers; 68 and 59.

Now both winding mandrels commence to rotate in the direction indicated-by arrow 10,

whereby firstly the loops 'II are formed by means .bent wire can be pushed between the mandrels r and y by means of the, eccentric 61 and the ofbolts 33 and jaws34. Hereby mandrels an and z -remain stationary in theaxiab position, but with continued operation the mandrels rise upwardly through cover-plate 2 by means of worm threads 30 so that the wire piece is taken along and winds itself tightly aroundthe manwinding process becomes continually tighter and is held tensioned by the stops 35 and 36. Shortly before completion of the winding operation the bolt 35 recedes so that the wire can contract to its final shape. Due tosucceeding downward motion of the winding mandrels '2: and y the bolts 33 and the jaws 34 release the loops H of the spring, whereupon this automatically opens and to form the finished double spring shown in Fig. 5. I

If two double springs are tobe interwound Y this is effected by means of the device according to invention very simply in that, prior to downward motion of the mandrels a: and y, viz. when the. double springs still tensioned and tightly wound around the mandrels, for example the part 12 .of the double spring as in Fig. 19 is placed over the winding mandrel a: or over part 13 of the tensioned spring as in Fig. 17 respectively. If the mandrels a: and y are now moved downwardly, the parts 12 and 13 spring into one another and hang togetherwith their windings after being drawn apart.

In order to manufacture a single spring of the kind shown in Fig. 20- the mandrel a: is disengaged, whereupon the rigid knife 6| is set at a distance from the loop-winding mandrel I5 as is requisite to form the loop 14., Then a driver 15, the edge 11 of which is designed as a cutting knife is moved in the direction'indicated by arrow 18,..whereby the wire end is cut and loop 14 formed. The winding and inter-winding is effectedin the same'manner asfor a double spring.

I claim:

' l. Inan apparatus for making coil springs, the combination of a rotatable, reciprocable mandrel; means for rotating said mandrel alternately in opposite directions; means adapted to move said mandrel end-wise in one direction when it is rotated in one direction, and in the opposite direction when it is rotated in the opposite direction; and wire engaging means adapted to grip the wire on one end of the mandrel so that the wire is wound on the mandrel when the mandrel is rotated in one direction, and to release the wire when the mandrel is rotated in the opposite direction.

2. In an apparatus for making coil springs, the combination of a horizontal plate having a pair of apertures; a pairof mandrels rotatable .to form two tensioned coils, and the bight of the piece forms a connection at the bottom thereof, said clamps being adapted when the mandrels rotate clockwise and descend to release, the coils from tension, the coils being detached from the mandrels, and supported on the plate through which the mandrels descend.

, 3. In an apparatus for making coil springs, the

. combination of a frame; a horizontal plate supported on said frame and having an aperture; a mandrel journaled in said frame and provided with a pinion and a helical groove; a segmental rack pivoted in said frame and meshing with said pinion; means for rocking said rack; a pin fixed on said frame and received in said groove, the rack and, pinion, and the pin and groove co-acting so that, when the rack is rocked in one direction, the mandrel is rotated and.

caused to move upwardly through the aperture, and, when the rack is rocked in the opposite direc-' tion, the mandrel is rotated in -the opposite direction and caused to move downwardly, until its upper end is flush with'the top surface of said plate; a post mounted on the upper end of the mandrel and projecting above the top surface of the plate when the mandrel is in its extreme downward position; and a jaw on the end of the mandrel, co-acting with said post to form a clamp, so that when one end of a piece of wire laid upon the plate is inserted between the post and the jaw itis gripped thereby, the groove having such configuration that when the mandrel t is rotated in the direction to cause it to niove ing said rack; a pair of pins fixed on said frame upwardly it makes a halt 'revolution before its upward movement begins, whereby the end oithe wire is looped around ,the post, the clamp being adapted to cause the wire to be woundunder tension about the mandrel, to form a coil spring duringtheupward movement or the man.- drel, and to cause the looped end of the wire to be disengaged, and the coil spring to be relieved from tension, released from the mandrel and to rest upon the plate about the aperture during the downward movement oi the mandrel.

4. In an apparatus for making coil springs, the combination of a frame; a horizontal plate supported on said frame and having a pair oi apertures; a pairof mandrels Journaled in said frame, each being provided .with a pinion and a helical groove; a segmental rack pivoted in said frame .and meshing with said pinions; means for rockand received in said grooves, respectively, the rack and pinions, and the pins and grooves co-acting so that, when the rack is rocked in one direction, both mandrels are rotated in the same direction and caused to move upwardly through the apertu'res; respectively, and, when the rack is' rocked v in the opposite direction, both mandrels are rotated-in the opposite direction and caused to move downwardly, until their upper ends are flush with the top surface of said plate; a post on the upper end of each mandrel and projecting above the top surface of the plate when the mandrel isin its extreme downward position; a Jaw on the end of each mandrel toeform a clamp, co-acting with the post on its mandrel, so that when the ends of a pieceof wire laid upon the plate are inserted between the posts and jaws of the mandrels, respectively, they are gripped thereby, thev grooves having such configuration that when the mandrels-are rotated. in the direction to cause them to move upwardly, they make a half revolution before their upward move? spring during the upward movement of the mandrels; a post fixed on said plate adjacent one of said mandrels; .and a second post movably mounted on said plate adjacent the other mandrel, the posts on the plate being adapted to tension the 'wire being wound on the mandrels. the movable post being displaced at the end of the upward movement or the mandrels thereby allowing the wire to form the final windings about the mandrels, said clamps being also adapted to cause the looped ends of the wire to be disengaged from the mandrels, and the wound portions to be there- 5. The method oi producing spring-nets formattresses; seat cushions andthe like, which consists in winding a length of wire about a mandrel,

thereby producing a tensioned'coil spring, reliev- 20 ing the spring of tension by releasing it from the mandrel,- winding a second length of wire about relieving the spring of tension by releasing it from the mandrel, winding a second length of wire about the mandrel, whilesurrounding the mandrel with the former untensioned spring, so

that the two springs are interwound, and continuing the process until a sufllcient number of inter wound springshas been produced to form arow of the desired length, repeating the process to produce a second rowoi-in'terwound springs, each a spring 01 the second rowbeing interwound with its acent spring in'the first row, and continument begins, whereby theends of. the wire piece in! P until the desired number of 5 produced.

terwound rows of interwound springs has been nii'rmm

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