FR2472698A1 - COMPRESSED SPRING RECALL DEVICE AND METHOD OF MAKING SAME - Google Patents

Abstract

THE INVENTION RELATES TO SPRING DEVICES SUBJECT TO PRELOAD. IT RELATES TO A SPRING DEVICE INTENDED FOR A PUNCHING MACHINE AND INCLUDING TWO HOUSING HALVES 20, 21 CONTAINING A SPRING 18. THE INTERNAL HALF 21 HAS A TRUNCONIC PART 35 FLAWING OUT TO THE OUTSIDE AND THE OUTER PART 20 TO A PART TRUNCONIC 40 TIGHTENING INTO THE INTERIOR, THE TWO TRUNCONIC PARTS, WHEN THEY COOPERATE, LIMITING THE GREATEST LENGTH OF THE CASE. CYLINDRICAL EXTENSIONS 37 AND 41 OF THE TWO HOUSINGS SLIDE AGAINST THE PERIPHERAL WALL OF THE OTHER HALF OF THE HOUSING FORMING A CIRCUMFERENTIAL JOINT. THE ASSEMBLY IS INTENDED TO RECALL A PUNCH 13. APPLICATION TO RECALL PUNCHES AND PUNCH PUNCH EXTRACTORS.

Description

The present invention relates to spring return devices

  compressed and housed in a housing, and in particular a punching assembly comprising a spring

tablet, placed in a housing.

  The springs are used extensively in punching devices to exert a force on

  a punch guide or that they separate the piece from the

  trice. In addition, the use of such springs in other machines is known in which they can be used for the recall of two movable members relative to each other, in one direction or the other. In some cases, the spring has already been disposed in a protective housing either for safety reasons or to prevent it from being affected by dirt and the like. In addition, we know

  already compress a spring in certain

  positive. For example, when using springs placed between a housing and a part which is partially housed in the housing and which partially exceeds, has already been used the application of a load prior to the spring at the time of mounting the piece in the housing so that

  the piece undergoes a desired initial return force.

  Moreover, in the field of punching, punching devices have already been used in which the punch has a return spring or a guide spring which can be subjected to a prior load,

  for example applied by an adjustable punch head.

  Although we know in the art each of the aforementioned characteristics taken individually,

  does not yet know a spring return device com-

  awarded, pre-loaded and placed in a bowl

  tier, inexpensive type and suitable for many applications. In some cases, it is desirable that the spring is housed in a housing for example so that the pieces of the spring are retained in case of breakage of

  this one. In addition, it is often desirable that

  is subject to a pre-determined, predetermined

  a whole race before getting a usable pressure.

  In addition, the inexpensive manufacture of

  spring loaded in housings having a height

  predetermined maximum permissible elongation

  while giving, for this condition, a pre-determined load, is very desirable. A spring device

  placed in a casing that compresses the spring without com-

  any passage leading to the inside of the housing, is

also very desirable.

  The permanent installation of such a housing containing a spring directly on an extractor guiding member, in a punching machine, is very desirable so that the

  housing is properly aligned with the surface of the

removal of the extractor.

  An inexpensive manufacturing process for

  spring loaded in a housing and subjected to a

  prerequisite, which can be made to predetermined dimensions

  completed for multiple applications, is very

desirable.

  In addition, an inexpensive method of manufacturing spring device placed in a housing, locked

  on the extractor guide of a punching machine, is very

visable. -

  The invention relates to a spring device

  loaded and housed in a housing, pos-

  seducing the above characteristics. In a first mode

  embodiment of the invention, the housing housing the resistor

  spell includes cup-shaped halves, arranged

  opposite, having open ends and extremes

  closed. One half has a smaller outer diameter than the other so that both halves can penetrate into each other through the ends.

  open. A compression spring fits into the housings

  third and the open ends of the halves are then deformed in such a way that they can not

  not to separate by spacing beyond a certain

  predetermined resolution. This dimension can be determined

  so that it corresponds to a maximum total height

  read or at a desired prior charge from the jurisdiction. In a particularly advantageous embodiment, the halves are deformed so that they are held on top of one another during assembly of the housing, the spring

being placed in the case.

  In a first advantageous embodiment

  of the invention, the inner and outer telescopic halves

  These are made in such a way that the inner half has an outer diameter which increases towards the open end, via a frustoconical portion, to a first dimension. This first dimension is however smaller than the internal diameter of the second external half

  of housing. This second half has a first diameter

  dull on its greatest axial length, which is greater than

  to the largest outer diameter of the portion of the inner half which is intended to be housed in the outer half. The internal diameter of the outer half, during assembly, is reduced by forming a section

  frustoconical close to the open end, after

  both halves. In this way, the frustoconical parts of the two halves abut one

  against each other and prevent the separation of the two halves.

  The open end of the inner half, at an axial location which is beyond the frustoconical section, preferably has an external diameter equal to the internal diameter of

  the first part of the outer half, and the diameter

  dullness of the outer half at the open end of the

  frustoconical element, is preferably equal to the external diameter

  of the first part of the inner half. From this

  the halves co-operate in an almost watertight

  so that no traffic route is formed.

  be the inner and outer halves, even when they are

  displaced from each other in a telescopic

Spades.

  In an advantageous embodiment, the housing

  internally has a frustoconical enlargement close to its

  open, before assembly. Then, the outer half undergoes a circumferential shrinkage at the time of assembly, under the control of a suitable die, the

  internal spring being then subjected to a prior load.

  In a second advantageous embodiment of the invention, the inner and outer halves, instead of having frustoconical portions, have open ends which are folded outwards and then inwards so that they abut ,

  In another advantageous embodiment of the invention

  For a punching assembly, one half of the spring device has a tail projection at its bottom wall.

  dovetail, intended to fit into a corresponding accommodation

  dovetail, formed on the upper face of

  removal of an extractor guide. A punch rod is

  placed near the bottom of the other half and goes into the

  positive spring, in the socket dovetail and in the extractor, so that it moves in translation

during punching.

  When mounting the interlocking device, the housing has a projecting annular wall whose diameter

  is such that it can be housed concentrically in the

  dovetail formation formed on the extractor. A dream

  An elastic but incompressible material is then placed inside the protruding wall of the housing and is compressed to radially outwardly. This radial movement causes deformation

  of the wall which takes a complementary position of em--

  in cooperation with the side walls of the

  dovetail. Then the applied pressure

  to the puck is removed so that the elastic material

  that resumes its original shape and the washer can be removed. One spring is placed at the open end of a first half of the housing, and the other half is housed on it so that the spring is surrounded and maintained under

a prior charge.

  Thus, the invention relates to a device for

compressed spring.

  It also relates to such a device having a helical compression spring housed in two telescopic cup-shaped housing halves having deformed open ends which cooperate so that the halves can not separate and form a joint.

  circumferential between the two halves.

  It also relates to a punching assembly having a spring housing housing permanently centered on an extractor guide so that a punch rod.

  passing through the boot and the extractor can be supported.

  Other features and advantages of the invention

  tion will become more apparent from the following description,

  with reference to the accompanying drawings, in which:

  FIG. 1 is a partial section of a

  appears to punch and die comprising a spring device according to the invention;

  FIG. 2 is a partial section of a device

  spring-loaded device according to the invention, used as a lifting device;

  FIG. 3 is a partial section of a first

  first formatting matrix, this figure showing the

  formation of an inner half of the housing of the device se-

  the invention; - Figure 4 is a partial section illustrating the mounting of the spring device according to the invention, and the final shaping of the outer half; - Figure 5 is similar to Figure 4 but corresponds to a subsequent step of the mounting operation; - Figure 6 is a section of an alternative spring device according to the invention;

  FIG. 7 is a partial section of a

  appears to punch in which the internal spring device is mounted permanently on an extractor guide;

  FIG. 8 is a partial section representing

  both male and female surfaces facing to form a nesting, these surfaces being formed on a

  half of the case and on the extractor, during a first

first editing operation;

  FIG. 9 is a section of half

  tier and the extractor, placed concentrically with a

  washer of elastic material arranged in the center and

  born to be compressed in a subsequent operation;

  FIG. 10 is a partial section representing

  both the compression of the elastic plate which expands radially and causes the deformation of the surface of the

  half of the case so that it forms a cooperative interlocking

  rant with the surface of the housing of an extractor, during a subsequent operation of the assembly; and

  FIG. 11 is a partial section representing

  both the relative position-after the compression of the

  delle elastic then its withdrawal, the surfaces of the housing

  spring and extractor cooperating with each other.

  Figure 1 shows a compressed spring device 10 according to the invention, used in cooperation with a punch. This punch 11 has a body 12 with an enlarged head 13 and a punching tip 14 at the end opposite the head. The punch 11 passes into an extractor 13A. It is itself mounted in a support 14A of

  punch which can be for example a turret of a poin-

  chainsaw with turret. A spring 15 is intended to lift the extractor 13A and the punch 11. The spring device 10, in the embodiment considered, is used as an extractor spring and comprises a coil spring

  18 compression housed in a housing 19. The latter

  takes the outer half 20 and inner 21 in the form of cups each having a peripheral wall 23 and a bottom 24. In the embodiment shown, the bottom 24 may have openings for the passage of the body 12 of the punch. A washer 25, housed at the bottom of the outer half 20, has a central opening 26 which cooperates with the enlarged head 13 of the punch. A piston 27 is intended to move the punch and to drive it into a piece 13 and into a complementary matrix 31 disposed in a support member 30 which may be for example the

  die turret of a turret punching machine.

  Each of the housing halves 20, 21 has one end.

  open end, the open end 32 of the inner half being disposed inside the outer half by the open end 33. The two halves have a circumferential variation near the end

  open, the inner half 21 widening through the

  of a frustoconical section 35 formed between the

  main section 36 having a normal diameter and an external axial section 37 which extends the frustoconical section 35

  32. Conversely, half of the ex-

  dull has a frustoconical section 40 of diameter reduction

  which leads to an axial extension 41 which delimits

even the open end 33.

  Preferably, the diameters of the two halves of

  are chosen in such a way that at the open ends

  te, the peripheral wall of the inner half cooperates with the inner surface of the normal diameter section of the outer casing, and that the peripheral wall of the housing

  the outer surface cooperates with the external surface of normal diameter.

  wrong of the inner case. In this way, there is no path allowing leaks between the two halves, and the latter can move telescopically by allowing compression of the spring. However, due to the cooperation of the frustoconical parts, the maximum spacing of the halves is limited. As the axial height of the two halves is limited by this cooperation of

  frustoconical parts, to a dimension less than

  spring 18 when it is not bandaged, this res-

fate suffers a prior charge.

  FIG. 2 represents the device 10 with

  sort according to the invention used with an extractor comprising

  a plate 50, mounted on a matrix base 51 and a cutting edge 52 of the die. The device 10 is housed in the space between the base 51 and the plate

  and it is meant to push the latter towards the ex-

  interior, so that the cut or punched material is extracted. In such a construction, it is desirable that the spring 18 be subjected to a pre-load, without, however, that the casing exceeds a specified maximum height. In this construction, a washer 54 having a tapped hole, placed at the bottom of the outer half 20, can cooperate with a countersunk head screw 55 so that the housing is attached to the extractor plate 50 while a screw 60 bears against a. washer 61 housed against the bottom of the half 21 and allows the.fixation of the device to

  the base 51. When the screw 55 is removed, a key of sec-

  hexagonal or any other suitable type may

  to the head of the screw 60 placed inside the housing

  tier. When both screws are in place, the housing is

  practically impervious to at least vis-à-vis

  because of the cooperation of the internal surface of

  the outer half and the outer surface of the half

  dull. It is noted that the arrangement of an axial section of

  constant diameter between the frustoconical parts,

  open ends, allows the formation of a relatively long sealing face near the two

  open ends when compressing the spring.

  This feature allows the device to act as a reserve of lubricant where appropriate; so that, for example in the case of the punch of Figure 1, a lubricant can be kept inside and can promote the lubrication of the punch 12. In addition, as shown in Figure 2, lubricant can be

  used for better heat dissipation

  evoked by the bending of the spring 18.

  Figure 3 illustrates a method of manufacturing the inner half of the housing. A punch 70 having a suitable external configuration 71 including a portion

  frustoconical 72, cooperates with a matrix 73 having the

  desired internal representation 74 so that the circumferential widening section 75 of the inner half 76

be trained.

  When the inner half has been formed, an

  A matrix comprising a matrix as shown in FIGS. 4 and 5 may be used for forming the outer half which has already been shaped into a cup.

  The halves can be made initially for

  shot of a tubular material, for example a steel tube.

  When the various elements such as the spring 18 and the upper washers 54 and lower 61 and, where appropriate, in the embodiment of Figure 2, the lower screw 60, were placed in the two halves, the latter are arranged one on the other. Then, a

  piston 80 can be used for compression of

  spell 18 and moving the outer half against the

  matrix 82 which deforms the open end of the half-

  externally substantially as shown in Figure 5.

  The pressure applied in the direction of the arrow 90 can be adjusted in one or more steps so that it gives the desired preload to the spring. However, when

  the deformation of the housing is achieved in a single operation.

  it is preferable that the minimum pressure of

  formation of the wall of the casing exceeds the pre-

  Maximum ble that can be obtained for this compression of the spring. In this way, the two halves can not

  not accidentally parting. In a variant, the

  placement of the member 80 can be adjusted so that the

  height of the formed assembly has the desired value. The utili-

  The use of dies or dies as shown in FIGS. 4 and 5 allows the two halves to move towards each other, to the extent necessary so that the preload of the spring and / or the height of the device have the desired values. since the recovery of the halves by

  Telescopic displacement is not predetermined. The sections

  truncated cones can be formed at any location along the peripheral wall of the external organ

  the circumferential narrowing that forms the

  The frustoconical element is continuous in the axial direction when moving half 20 into the matrix 82. The only additional effect of displacement is an increase

  the length of the axial section 41.

  Fig. 6 shows an alternative spring device 95, having open ends 96 and 97 of

  halves 20a and 21a which are folded.

  In the embodiment of Figure 6, the

  inner half 21A has its open end 96 which is

  folded outwardly and which forms a face 98 constituting a circumferential edge, around the outer part of the

  half 21a, this face being turned away from the former

  open end 96. The open end 97 of the outer half 20a is folded on itself inwardly and forms a circumferentially disposed flange face 98

  at the inner part of this half 20a, this tour-

  back to the open end 97. In this way, the

  faces 98 and 99 abut against each other and prevent

  the separation of the two halves. Folding in directions

  oppositeof the open ends 96 and 97 can be

  brought about by the application of conventional techniques of

  triçage. The outer half may have a bend formed at the time of assembly substantially as shown in Figure 4, but by implementing a special matrix

replacing the matrix 82.

  The foregoing description shows that the invention

  relates to a compressed spring device in which a compression coil spring is placed in a housing comprising two telescopic halves which are locked

  on each other by cooperation close to their ex-

  open ends because of the circumferential

  the open ends, forming circumferential faces

  co-operative, with halves able to penetrate

  one in the other, the opposite faces limiting the spread

the two halves.

  The invention also relates to a device 100 as shown in FIG. 7, comprising a spring housing 101 and an extractor guide 102, which can be used in a punch press such as

  shown in Figure 1. This provision facilitates

  the proper alignment of the housing containing the spring on the lifting surface of the extractor. The casing has outer casing-shaped inner and inner casing halves 105 having outer frustoconical free ends 107 and inner 108 which telescopically engage as previously described, and bottoms 109 and 110. A coil spring 111 is placed in the housing. casing and is under a pre-load. The lower end 111 bears against the bottom 110 while the upper end of the spring bears against a washer 112 which is pushed against a mounting ring 113. This is placed in a central opening 114 of the bottom 109 of the outer half and it supports a mounting head 115

of the rod 104 of the punch.

  The body 103 of the punch rod has one end

  threaded upper channel intended to be screwed into a tapped central channel 116 formed in the head 115. This screw connection allows the arrangement of the rod in an adjustable manner in the vertical direction, in the device, this holding in position being fixed by an element 117 snap.

  The body of the punch rod is placed coaxially

  The orifice 118 is annularly limited by a projecting wall 119 at the bottom of the casing and is directed downwards in a central orifice 118 of the bottom 110.

  dovetail, fitted into a housing 120 of complementary shape

  elementary made on the upper surface 125 of lifting the body 122 of the extractor. The cavity is limited by an annular wall 123 which converges upwards and by a flat lower surface 124 traversed by a central passage 125. The latter is arranged axially in the body of the extractor and allows the sliding of the body.

  of the punch. A lift spring 126 is placed between

  centrically around the extractor and cooperates with a lip 127 disposed overhanging. The device 100 operates as described with reference to FIG.

  can note the men of the trade.

  Figures 8 through 11 illustrate the fabrication of the device 10O. As shown in Figure 8, the inner half 106 is initially empty and has an open end. The projecting wall 118 formed on the half is initially in the form of a vertical annular wall whose diameter is smaller than the smallest diameter of the side wall 123 of the cavity of the extractor. So,

  the wall 119 can be housed concentrically in the housing

  120 dovetail as shown in Figure 9 so that the bottom 110 of the housing bears against the

  upper face 121 of the extractor.

  When forming the tail nesting

  dovetail, a washer 130 of elastic material but

  compressible material, for example a urethane resin, is

  on the surface 124, centered on the surfaces 119 and

  123. The original diameter of the washer may be clearly

  lower than that of wall 119 but must be

  the diameter of the passageway 125. An element of compres-

  sion such as a piston 131, flattens the washer 120 so that the elastic material is driven radially outwardly as shown in Figure 10. The pressure

  of the material of the washer causes deformation

  wall 119 to the side wall 123 and to the

  tact, so that the walls cooperate and form

  an interlocking dovetail.

  When the interlock has been formed as shown in Fig. 11, the pressure applied to the piston is suppressed. The washer returns to its original shape and can be easily removed from the housing 120. Next, the spring 111 is placed in the inner half 106 and the outer half 105 is mounted to form the housing

  as previously described, with the inner half.

* It is understood that the invention was not

  as a preferred example and that any technical equivalence may be

  constituent elements without departing from its scope.

Claims (7)

  1. Spring device subject to a pre-load   characterized in that it comprises two members (20,   21) each having a peripheral wall sensi-   tube and a bottom at a first axial end of the peripheral wall, as well as an end   open at the second axial end of the peri-   the first member (21) of the housing having a diameter   outermost limit less than the maximum internal diameter of the second housing member (20), the open end of the first member (21) penetrating into the open end of the second member (20), the first and second members of the housing being movable telescopically in the axial direction, a section (35) of increasing outer diameter of the first member (21) being formed between the axial ends of the   this member, a section (40) of decreasing inner diameter   the second member (20) being formed between the ends   axial sections thereof, the two sections being intended to abut against each other, this cooperation preventing the mutual withdrawal of the two members (21, 20)   housing, and a spring (18) housed inside the   housing members, this spring having, in the free state, a length greater than the maximum internal axial length   housing members when said surfaces of the sections   we are in abeyance so that the spring is subjected to a prior charge.   2. Device according to claim 1, characterized in that the peripheral wall of the first member (21) of the housing widens radially near the open end by forming a frustoconical section (35) which leads to an axial section ( 37) of substantially constant diameter, the constant diameter section terminating at the open end, the peripheral wall of the second housing member (20) having a diameter reducing portion (40)   adjacent to the open end, this portion of   diameter having a frustoconical section terminating in an axial section (41) of substantially constant diameter,   the axial section ending at the open end, the di-   meter of the axial section (37) of the first housing member (21) being substantially equal to the inner diameter of a portion of the peripheral wall of the second housing member, beyond the frustoconical section in the axial direction in the opposite direction to the open end, the inner diameter of the axial section (41) of the second casing member (20) being   substantially equal to the outer diameter of the peripheral wall   first housing member (21) beyond the section   truncated cone (35) in the axial direction, in the opposite direction to   it of the open end of the first casing member, so that the axial section of each member of the casing cooperates with the surface of the peripheral wall of the other   casing member forming a circumferential seal.   3. Device according to claim 1, characterized in that the open ends of the casing bodies   (20a, 21a) are delimited by portions of the wall   which are folded back on themselves, the first   housing member being folded radially outwardly   and the second being folded radially towards the   the folded portion (96) of the first member (21a) having an outer diameter substantially equal to the inner diameter of portions of the second member (20a) of the stack, being axially beyond the folded portion (97) of the second member ( 20a) in opposite direction to the open end,   the folded portion (97) of the outer member (20a) of bot-   tier having an internal diameter substantially equal to the diameter   external meter of the first boot member (21a),   beyond the folded portion (96) of the first member in the axial direction, so that the axial ends of the folded parts are arranged facing each other and prevent the   separation of the two body members, the surface of the   folded portions being in contact with a surface of the peripheral wall of the other casing member, with formation a circumferential seal.   4. Device according to claim 1, characterized in that the bottom (110) of a member (106) of the casing is   attached to an extractor guide member (122) by an limping (119, 120).   5. Device according to claim 4, characterized in that the interlocking (119, 120) is formed by a peripheral wall (119) dovetail projecting from the bottom (110) of a body member and housed in a housing. cavity (120) in   substantially corresponding shape of a dovetail,   aligned in an outer face of the extractor guide member (122). 6. Device according to claim 5, characterized in that it further comprises a punch rod (103),   passing through the extractor guide member (122) and   two bodies (105, 106) of the device housing, the rod   being supported so that it can move in trans-   the rod (103) having a fixed upper end   at the bottom of one of the bodies of the case.   7. A method of manufacturing a nested assembly comprising a spring placed in a housing and subjected to   a pre-load and an extractor guide to   said method being characterized in that   takes the formation of two halves of box-shaped   cups each having a circumferential peripheral wall   a bottom and an open end such as the former   open end of the first housing half can penetrate   through the open end of the second housing half, the circumferential deformation of the first housing half near its open end so that it forms a localized section of increased diameter, the formation   a peripheral wall of connection exceeding in   substantially axially outward movement of the bottom of the first housing half, forming a central peripheral cavity having an axially diverging wall   inward, in an outer face of an extrac-   the arrangement of the connecting wall in the central cavity so that it is substantially concentric with the side wall of the central cavity, the deformation   from the connecting wall in the radial direction to the ex-   interior so that it comes to cooperate practically with   the side wall of the central cavity ensuring the   bottom of the first housing half on the extractor guide, the introduction of a spring in the first housing half so that a first end of the spring bears against the bottom of the first half and his other end protrudes through the open end of the first mesity, the -mounting of the second half of   housing on the first half and on the spring, the first   half being placed in a substantially   in a deformation matrix, the force thrust   from the second housing half to the deformation matrix   to ensure that the spring is compressed and that the wall   the second housing half is deformed at its open end and forms a localized section of reduced diameter, and the reduction of the diameter of the segment of   diameter reduced to less than a maximum diameter   badly of the increased diameter section of the first half of housing so that the first and the second half of   housing can not separate.