US3205917A - Apparatus for realizing eyelets at the ends of helical draw springs - Google Patents

Apparatus for realizing eyelets at the ends of helical draw springs Download PDF

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Publication number
US3205917A
US3205917A US213783A US21378362A US3205917A US 3205917 A US3205917 A US 3205917A US 213783 A US213783 A US 213783A US 21378362 A US21378362 A US 21378362A US 3205917 A US3205917 A US 3205917A
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spring
springs
forming
mentioned
runner
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Vanhulen Antoine Emile Florent
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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
    • B21F35/00—Making springs from wire
    • B21F35/02—Bending or deforming ends of coil springs to special shape

Definitions

  • This loop is generally obtained by straightening out a turn or a portion of a turn to bring it in a plane passing through the longitudinal axis of the helical spring.
  • the conventional process comprises keeping the spring horizontally or obliquely in the presence of a tool for straightening out the last turn and then actuating said tool, this operation being repeated successively for both ends of the spring.
  • This process comprises substantially bringing the helical spring in a vertical or nearly vertical position, acting upon it to bring it in a correct position, securing it in this position so that at least the lower turn be kept completely free, bringing a stop in the presence of the turn portion being straightened out and acting against the said stop the said turn portion being straightened out to bring it in such a position that, when freed from this action, it takes up its correct definitive position.
  • the characteristical forming means according to the invention for carrying the said process comprise substantial means for feeding and keeping one by one the helical springs with their longitudinal axis in a vertical or nearly vertical position, means for supporting temporarily the said springs and determining the correct posi- Ice tion thereof, means for acting upon the said springs to bring them in a correct position by an eventual rotation and/or translation movement, means for securing the said springs in the said correct position, while the said underlying support stands sideways, means for forming the side stop to the portion of the lower turn being distorted and for forming a temporary separation between the said turn portion and the underlying turn, means for acting upon and bending the portion of the terminal turn of the spring against the said stop to form automatically and successively such a loop at both ends of the helical springs, and, between two groups of such means, the interposition of a receiving-reversing means.
  • the apparatus according to the invention for realizing loops at both ends of the draw spring will generally comprise two groups of the said means disposed under each other and separated by the said receivingreversing means, the apparatus including of course all the equipment necessary for starting or stopping opportunely the said means and devices as well as any controlling, safety and correcting means allowing an automatic and regular operation of all the said means and devices in view of a completely automatic production.
  • FIGURE 1 is a front view of a spring, the loop shaped ends of which are realized according to the process and by the apparatus of the invention;
  • FIGURE 2 shows by way of example and for the sake of the cause a helical spring, the turns of which are previously spaced from each other, namely with the view of giving more clearness to the description and the other figures;
  • FIGURES 3 and 4 are respectively side and front views of the spring of FIGURE 2, after having realized the end eyelets;
  • FIGURES 5 to 12 show as summarily as possible the successive steps of an operational cycle according to the invention
  • FIGURE 13 is a presepctive view of the head of the apparatus according to the invention, some elements being taken away for more clearness;
  • FIGURE 14 is a persepctive view, on a larger scale, of a portion of the head represented in FIGURE 13;
  • FIGURE 15 is a cross sectional view of the elements of the said apparatus in the step of the process corresponding to FIGURE 5;
  • FIGURE 16 is a section on the line XVI-XVI of FIGURE 15;
  • FIGURE 17 is a view according to the arrow F17 of FIGURE 15;
  • FIGURES 18, 19 and 20 are respectively sectional views according to the lines XVIII-XVIII, XIXXIX and XX-XX of FIGURE 17;
  • FIGURE 21 is a view similar to that of FIGURE 15, but corresponding to the step ,of the process represented in FIGURE 6;
  • FIGURE 22 is a sectional view according to the line XXIIXXII of FIGURE 21;
  • FIGURE 23 is a sectional view according to the line XXIII-XXIII of FIGURE 21;
  • FIGURE 24 represents diagrammatically the combination of a forming mechanism of the receiving-inverting device and the upper portion-of a second forming mech-' anism
  • FIGURE 25 is a vertical section of the sleeve of the forming mechanism
  • FIGURE 26 is a plan view of the sleeve of FIGURE 25
  • FIGURES 27 and 28 are respectively sectional Views according to the lines XXVIIXXVII and XXVIII- XXVIII of FIGURE 25;
  • FIGURES 29 and 30 show as summarily as possible in two characteristical positions another embodiment of a forming mechanism according to the invention.
  • FIGURE 31 is a front view of the tasting elements of the control device for the conduits feeding the springs to
  • the first step of the process comprises bringing the 7 spring 1 at the end of a conduit 4, the internal diameter of which is such that it allows the guiding and the sliding of the said spring 1, the latter abutting against an adjustable and displaceable support, the upper face of which 6 has a helically shaped track.
  • the said conduit 4 is extended by a sleeve 7, the internal diameter of which is the same as the internal diameter of the said conduit 4.
  • This sleeve has inclined external grooves 8-9-10, in which are housed rods 11-12-13 respectively.
  • the lower portion of the said sleeve 7 has side ports 14-15-16 and, on the corresponding portion of the said rods 11-12-13, there are mounted cylindro-conical rollers 17-18-19 respectively.
  • the said inclined grooves 8-9-10 have a depth substantially higher than the diameter of the said rods 11-12-13 respectively to allow to the latter and, consequently, to the said cylindro-conical rollers 17-18-19 to shift radially.
  • a rotating runner 20 is mounted loosely and with an easy fit on the said sleeve 7 above the said rollers 17-18-19, the upper portion of the said runner being externally toothed up to a certain level while meshing permanently with a pinion 22 keyed on an axle 23, which may be driven by an appropriate mechanism (not represented).
  • a fork 24 is engaged with the peripheral groove 25 of the said runner 20 and this fork may be conveniently shifted with an alternating movement by an appropriate mechanism (known per se) not represented, but such that the said runner 20 may be shifted along the sleeve 7, while being kept engaged with the said pinion 22.
  • the lower portion of the runner 20 has a recess 26, the conical wall 27 of which may act upon the conical portion of the said rollers 17-18-19.
  • the latter are preferably made of an appropriate material, e.g. a synetheticresin, i.e. an amine resin.
  • the said support 5 is extended at its lower portion by a tail 2% diametrally engaged with the end of a rod 29, on which it may be firmly tightened, e.g. through the intermediary of a bolt 30 and nuts 31-32.
  • the said support 5 is made displaceable owing to the fact that rod 29 may be shifted lengthwise at the appropriate time by a suitable mechanism also known per so (not represented).
  • a sort of horizontal vice having a stationary jaw 33 firmly secured to the adjoining portion of they frame and a laterally moving jaw 34.
  • the latter is connected with the former by a resilient arm 35 and both these jaws 33-34 are such that the width L of the space they normally outline, is larger than the diameter of the spring 1, while the cylindrical face 36 of the recess'of the station ary jaw 33 is firmly secured in the extension of the corresponding portion of the internal cylindrical face of the sleeve 7.
  • This complex moving set comprises at different and duly predetermined levels a proper push 38 disposed at the level of the resilient moving jaw 34, an intermediate lamination 39 and the stop element 40.
  • This moving set is such that the push 38, on one hand, and the intermediate lamination 39 and the stop 40, on the other hand, may be shifted by individual translation movements, but preferably through the intermediary of the same mechanism provided according to the operating cycle of the process of the invention.
  • the intermediate lamination 33 has such a position or a level that it may come between the last and the last turn but one of the spring, while being still adjoining to the said moving jaw 34.
  • the stop 40 has, at its free end, a particular shape, the details of which are represented in FIGURES 17 to 20. It will be observed that this free end has two oppositely inclined planes 41-42 separated by a median longitudinal recess 43. The distance between the lower face of the intermediate lamination 39 and the upper face of the stop is substantially equal to the thickness of the wire forming the spring. On theother side of the vice 33-36, there is disposed the loop forming tool 44.
  • the forming tool 44 is adjoining to a buffer 45 which may cooperate with the tool 44 at the end of the forming run.
  • the forming tool 44 and its adjoining buflFer 45 are guided in the slideway 46 and in relationship with a driving mechanism known per se (not represented), which may shift them according to an alternating translation movement, this guiding being such'that the said tools are shifted in a direction inclined with respect to the shifting direction of the moving set 37-40 at the other side of the spring 1.
  • This forming mechanism embodying one of the characteristics of the invention operates substantially as follows: the different constituting elements of the mechanism are in the position represented in FIGURE 15, in which the rotating runner 26 is in its high position, thereby releasing the rollers 1'718-19,which are thus in their maximurnniutual spacing. Howeven'the said runner 20 is permanently rotating, while being driven by the toothed pinion 22.
  • the vice 33-36 is opened; the moving set 37-40, on the one hand, and the forming tool 44-45, on the other hand, are in waiting position and the'support 5 has been dully adjusted on the height and angularly to be at a suitable level under the said vice 33-36.
  • the springs 1 are fed one by one in free fall through the conduit 4 and they come to rest on the lower support 5.
  • the rotating runner 20 is lowered by means of the fork24 in such manner that its conical face 27 exerts a radial pressure on the cylindro-conical rollers 17-18-19, which are brought nearerto eachother while clasping peripherically the corresponding portion of the spring 1, since the rods and the axis of the said rollers 17-18-19 are inclined and owing to the conjugated rotation and axial pressure effects, the said rollers are driving the spring 1 in a helical downwards movement.
  • the support 5 moves aside, namely by a transverse withdrawal movement of the rod 29 conveniently driven by a known mechanism (not represented). Then, the second portion of the moving set, i.e. the intermediate lamination 39 and the profiled stop 40 is shifted to the spring 1 in such manner that the said lamination 39 comes between the last and the last lower turn but one of the spring, whereas the profiled stop 40' comes to rest in front of the turn portion intended to form the loop (FIG- URE 9).
  • the forming tool 44-45 moves forward, the said tool acting upon and pushing back the turn portion intended to form the loop, to apply the same against the profiled stop 40 as represented in FIGURES and 24.
  • the moving set 37-49 and the forming tool 44-45 withdraw, thereby releasing the spring 1.
  • the said spring 1 falls in the said tubular element 47 included in the receiving-reversing device.
  • This device is substantially formed by the said tubular element 47 integral with a hub 48 it traverses diametrally and to which it is fastened, eg through a screw 4? in such a manner that the said tubular element may be shifted and adjusted.
  • a toothed crown 50 meshing with a rack 51 is integral with the said hub 48.
  • the said toothed crown 50 may be rotated by a known means (not represented) so as to run' on the rack 51, thereby inducing the rotation of the said tubular element 47 in one direction or the other according to the direction of the said running.
  • the tubular element 47 may be thereby brought from the high position represented in 52 to the low position represented in 53.
  • the assembly 47-51 may be also preferably mounted on a carriage or runner such that, when the tubular element is in the high position represented in 52, this assembly rises somewhat in such manner that the mouthpiece of the tubular element 47 comes very near the lower end of the spring 1, thereby providing a correct fall of the latter in the said tubular element. Then, a rotation move ment of 180 is imparted to the latter about the axis of the hub 48 to come co-axially with respect to a tubular inlet 54 for the second forming mechanism, this tubular inlet 54 being equivalent to the said tubular inlet 4 of the first described forming apparatus.
  • This second forming apparatus operates exactly as the first apparatus, the springs 1 with their two loops 2-3- being then removed.
  • a screen 55 is disposed in a paralleldirection at a slight distance from the path of the mouthpiece of the tubular element 47 from its horizontal position down to its lower position.
  • This screen has two purposes: on one hand, preventing the accidental ejection of the spring temporarily housed in the tubular element 47 before the latter has reached its lower vertical position and, on the other hand, serving as a safe ty device in case two springs should be accidentally carried through the said tubular element 47. In that case, one of these two springs would project beyond the mouthpiece of the said tubular element 47 and would abut against the upper edge of the said screen 55.
  • the correct feeding thereof with springs is importantand it is essential to secure as well the different mechanisms as the whole apparatus against the failures or the irregularities in the said feeding. This is as more important as the working rhythm is relatively rapid and the production per hour of the apparatus is high.
  • the feeding means of the apparatus are still controlled by a plurality of safety devices. The ones are controlling quantitatively the feeding, whereas the others are controlling it qualitatively.
  • the quantitative controlling elements consist of elements forming both jigging elements and tasting elements, the position of which controls the feeding mechanism and eventually the whole apparatus.
  • the said tubular element 4 has a longitudinal port 56, through which the tasting elements may enter the said tubular conduit 4.
  • a first upper tasting element is provided by a resilient metallic rod 57 integral with the basis 58 of a microswitch 59 (controlling the feeding device of the apparatus), the pushknob 60 of Which is normally kept at a slight distance from the said taster 57, the said basis 58 being itself made integral with the axis 61 of the driving means of the said taster 57.
  • the free end 62 of the said taster 57 is bent downwards under to be parallel with the longitudinal axis of the tubular element 4.
  • this first control and safety device there are provided two tasters 63-64 formed by a single metallic rod, the free ends 65-66 respectively of which are bent perpendicularly to the longitudinal axis of the tubular element 4. Both these tasters 63-64 are secured on an axis 67 through the intermediary of an element 68 of an electrical insulating material.
  • the lower taster 64 is included in the electrical circuit, in which the tubular element 4, the circuit controlling the driving motor of the apparatus as well as the feeding device thereof are also included.
  • An alternating rotation movement is also periodically imparted to the axis 67 common to both tasters 63-64 to alternatively engage and disengage their free ends 65-66 respectively with and from the said tubular element through the longitudinal port 56.
  • This manifold safety means operates substantially as follows: the feeding device of a known type is represented in FIGURE 13 by the drum 69 supplying the springs one by one in the upper portion of the tubular element 4. This spring is collected by the first taster 57 which retains it, then the said taster 57 moving sideways, it releases the spring which is collected by the free end 65 of the taster 63. Then, the two tasters 63-64 moving aside, the spring falls in free fall, traverses the sleeve 7 of the forming mechanism and comes to rest on the support 5, as previously described.
  • the push-knob 60 ' is actuated.
  • the feeding mechanism of the apparatus is thereby automatically stopped as long as the said taster 57-62 is contacting this overfeeding.
  • the said microswitch will be repeatedly actuated as long as the said feeding will be defective.
  • Each of the jaws 70-71 has a semi-cylindrical recess and their mally secured co-axially and above the said tubular feed? ing conduit 4 of the upper forming mechanism, and also under the delivering element 81 of the feeding mechanism 69.
  • the alternative movement of the device 70-78 is such that the jaws 70-71 are periodically brought in opened position above the mouth piece of the discharge tube 79 owing to the contact between the free end 78 of the jaw 71 and the stationary stop 80. Consequently, every qualitatively correct fall of a spring through the cylindrical opening 77 does not result in any intervening of the said qualitative control device. However, if any defect of a spring provides the latter with a projecting portion, a permanent deformation increasing locally the transverse dimensions or still any distortion, the spring being not able to pass through the said cylindrical opening 77 is kept secured in the latter or on the jaws 70-71.
  • both jaws 70-71 are spaced under the action of the stop 80 and they defective spring will fall in the mouthpiece of the discharge conduit 79 and it will be thereby automatically discarded.
  • the ganging device returns then automatically to its initial position, namely ready to control the next spring supplied to the first eyelet forming apparatus.
  • This axis 82 is surmounted by a cutting 33, which is itself extended by a thread-like length bent to present a leg 84 aslant with respect to the longitudinal axis of the said elements 82-83.
  • the said leg 84 has such a length and a disposition that it may provide a temporary support for the springs 1 which are reaching it by falling through the said sleeve 7.
  • the step-by-step rotation movements of thisvspecial support 82-83-84 are provided in such manner that each spring l is brought into the correct position before forming the loop.
  • the driving, stopping and controlling mechanisms of the said special support may use known means (not represented).
  • An apparatus for forming eyelets upon apposite ends of helical draw springs comprising, in combination, a vertical conduit for a spring, means feeding the springs, means for controlling the quality of springs, the second-mentioned means being connected with thefirst-mentioned meansand the top of said vertical conduit, a discharge conduit connected with the second mentioned means, a positioning sleeve enclosing the lower portion of said vertical conduit and .having inclined grooves uponits outer surface and a plurality of side ports upon its lower end, rods in said grooves, rollers carried by the lower ends of said rods and located opposite said side ports, a runner mounted upon said sleeve and movable vertically upon saidsleeve, means rotating said runner, said runner when lowered engaging and moving said rollers toward each other to cause them to impart a downward helical motion to the spring being treated, a device located below said vertical conduit for forming an eyelet upon one end of a spring, a spring-receiving
  • the means controlling the quality of springs constitute a gauging device comprising two jaws adapted to embrace a spring, means hingedly supporting said jaws, a rotatable lever connected with one of said jaws, a release spring connected with said lever, and a stop adapted to be engaged by the other one of said jaws.
  • rollers have conical portions and wherein said runner has conicalsurfaces adapted to engage the conical portions of said rollers.
  • An apparatus in accordance with claim 1, comprising a vice located between said vertical conduit and the first-mentioned device, said vice comprising a stationery jaw and a laterally movable jaw connected with the firstmentioned jaw; and a pushing member adapted to engage the second-mentioned jaw and push'it against a spring.
  • the first-mentioned device comprises a lamination integral with said pushing member and adapted to engage between the turns of a spring, a stop integral with said. lamination, and a loop forming toolcooperating with said stop.
  • An apparatus for forming eyelets upon opposite ends of helical draw springs comprising, in combination, a vertical conduit for a spring, means feeding the springs, means for controlling the quality of springs, the second-mentioned means being connected with the first-mentioned means and the top of said vertical conduit, a discharge conduit connected with the secod-mentioned means, a positioning sleeve enclosing the lower portion of said vertical conduit and having inclined grooves upon its outer surface and a plurality of side ports upon its lower end, rods in said grooves, rollers carried by the lower ends of said rods and located opposite said side ports, a runner mounted upon said sleeve and movable vertically upon said sleeve, means rotating said runner, said runner when lowered engaging and moving said rollers toward each other to cause them to impart a downward helical motion to the spring being treated, a device located below said vertical conduit for forming an eyelet upon one end of a spring, a spring-rece
  • An apparatus in accordance with claim 6, comprising a curved screen uniformly spaced from said tubular member during a part of its rotary movement, and electrical signalling means for stopping the apparatus when said screen is engaged by a spring.

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US213783A 1961-08-11 1962-07-31 Apparatus for realizing eyelets at the ends of helical draw springs Expired - Lifetime US3205917A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3705609A (en) * 1970-09-01 1972-12-12 Usm Corp Manufacture of springs
US3782425A (en) * 1972-02-28 1974-01-01 British United Shoe Machinery Manufacture of springs
US5415208A (en) * 1993-12-09 1995-05-16 Wu; Chin-Tu Auxiliary spring bending machine
EP1350581A2 (fr) * 2002-04-05 2003-10-08 OFFICINA MECCANICA DOMASO S.p.A. Dispositif pour le formage de fil, en particulier machine d'enroulement et de cintrage de ressorts
CN107497976A (zh) * 2017-10-11 2017-12-22 苏州德魁家居科技股份有限公司 一种调整弹簧座圈的换向转盘
CN110035853A (zh) * 2016-12-23 2019-07-19 喜利得股份公司 具有螺旋管状的钻杆的钻头和用于制造用于钻头的螺旋管状的钻杆的方法
CN112008022A (zh) * 2020-08-24 2020-12-01 黎丽珍 一种给弹簧施加弹力机
CN114367607A (zh) * 2020-10-15 2022-04-19 安徽永舟文具有限公司 一种多轴联动的弹簧机

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1051497A (en) * 1910-09-29 1913-01-28 American Steel & Wire Co Helical-spring-hooking machine.
US2078828A (en) * 1936-01-28 1937-04-27 Connor Spring Mfg Co Spring machinery
US3069024A (en) * 1959-04-24 1962-12-18 Sleeper & Hartley Inc Machine for looping coil springs

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1051497A (en) * 1910-09-29 1913-01-28 American Steel & Wire Co Helical-spring-hooking machine.
US2078828A (en) * 1936-01-28 1937-04-27 Connor Spring Mfg Co Spring machinery
US3069024A (en) * 1959-04-24 1962-12-18 Sleeper & Hartley Inc Machine for looping coil springs

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3705609A (en) * 1970-09-01 1972-12-12 Usm Corp Manufacture of springs
US3782425A (en) * 1972-02-28 1974-01-01 British United Shoe Machinery Manufacture of springs
US5415208A (en) * 1993-12-09 1995-05-16 Wu; Chin-Tu Auxiliary spring bending machine
EP1350581A2 (fr) * 2002-04-05 2003-10-08 OFFICINA MECCANICA DOMASO S.p.A. Dispositif pour le formage de fil, en particulier machine d'enroulement et de cintrage de ressorts
EP1350581A3 (fr) * 2002-04-05 2004-06-16 OFFICINA MECCANICA DOMASO S.p.A. Dispositif pour le formage de fil, en particulier machine d'enroulement et de cintrage de ressorts
CN110035853A (zh) * 2016-12-23 2019-07-19 喜利得股份公司 具有螺旋管状的钻杆的钻头和用于制造用于钻头的螺旋管状的钻杆的方法
CN110035853B (zh) * 2016-12-23 2020-09-15 喜利得股份公司 钻头和用于制造用于钻头的钻杆的方法
CN107497976A (zh) * 2017-10-11 2017-12-22 苏州德魁家居科技股份有限公司 一种调整弹簧座圈的换向转盘
CN107497976B (zh) * 2017-10-11 2023-11-21 德魁智能装备(苏州)有限公司 一种调整弹簧座圈的换向转盘
CN112008022A (zh) * 2020-08-24 2020-12-01 黎丽珍 一种给弹簧施加弹力机
CN114367607A (zh) * 2020-10-15 2022-04-19 安徽永舟文具有限公司 一种多轴联动的弹簧机
CN114367607B (zh) * 2020-10-15 2024-04-19 安徽永舟文具有限公司 一种多轴联动的弹簧机

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GB976655A (en) 1964-12-02
CH399390A (fr) 1965-09-30

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