FR2462724A1 - DEVICE FOR THE DECENTRING OF GLASSES OF GOGGLES AND THE PLACEMENT OF A RETENTION MEMBER - Google Patents

Abstract

EYEWEAR. FOR ITS MACHINING, THE BEZEL GLASS IS CARRIED BY A TRANSLUCENT DISC 37 WHICH CONSTITUTES THE MEDIAN ELEMENT OF A CARDAN SUSPENSION. OFF-CENTERING DEVICE FOR THE EDGE OF CORRECTIVE LENSES.

Description

The present invention relates to a device for decentering glasses

  eyeglass correctors and the introduction of a retaining member for the introduction of the corrective lens into a machine for grinding the edge thereof, which device comprises a support which holds the spectacle lens in a inclined position and off-center, and a support piece applied from the top to the glass and a device for the introduction of the retaining member on the glass of

glasses.

  German patent application 2,220,373, published before examination, discloses a device for off-centering spectacle lenses, in particular bifocals, and setting up a retaining member.

  on the glass in which the spectacle lens is

  movably held in its plane by a plurality of support rods and by the pressure of a spring between a light source and a light distributor. Since the support rods are adjustable in the direction of

  their length, they can adapt to the underside

  re of the glass they carry and thus maintain the latter in its inclined position so as to allow the establishment, on the upper face of the glass, a retaining member, for example a suction cup. However, this known device has a high height because of the support rods. It is, moreover, necessary to provide a perfect guidance without play for the stems which are of a significant length. When the stems are subject

  torque, particularly in the case of a

  trage important, they get stuck in their guides.

  Another device is known for decentering corrective glasses and for placing a retaining member on the glass in

  which the glass rests on a spherical cap

  as a flat bearing surface and whose lower part

  spherical is housed in a recess of corresponding shape.

  of the device frame or rests in appropriate supports. This embodiment is of a high cost, especially when the spherical cap is held by different supports; moreover, one is confronted with problems of friction during the mounting of the cap in a corresponding recess of the wall of the device. The object of the present invention is to create a

  positive of the type mentioned which allows, on the one hand,

  significantly reduce the height of the device and,

  on the other hand, to eliminate friction problems when

  of the glass according to the desired decentering and which, moreover, is of a simpler design and a more

  low cost that the forms of

  bare with support rods, this device must also allow illumination by a light source

  placed below the glasses lens.

  In order to solve these problems, the invention provides for use as a support member for spectacle lenses, a disc constituting the median element of a

  cardan suspension. The gimbal suspensions

  laying, on the one hand, of the median disk and, on the other hand, of a

  ring surrounding it and mounted, like a car-

  dan, in a recess and, preferably, in the plane of

the table of the device.

  Various other features of the invention

  from the detailed description which follows.

  Embodiments of the object of the invrention are represented, by way of non-limiting examples,

attached drawings.

  Fig. 1 watch, in side elevation and in section,

  a device in which a graduated scale and a gabal

  are reproduced inside the observation beam.

  Fig. 2 is a plan view of the suspension at the

gimbal of the device.

  Fig. 3 is a top view of a form of reality.

  in which the support for the spectacle lens is in the form of a horseshoe with protrusions on

its lower face.

  Fig. 4 is a side view of the form of

according to FIG. 3.

  Fig. 5 is a top view of the gimbal suspension having a median disc bearing non-slip ribbons. Fig. 6 is a plan view of another embodiment showing a median disc having a graduated reticle.

  Fig. 7 shows, in lateral section, a sus-

  gondola board whose translucent median disc

  has on its underside, a lens or a filter.

  During the use of the device, the observer places his eye 1 in front of a lens 2 behind which there is a prism 3 which deflects, thanks to its surfaces 4, the observation beam B in a vertical plane. After leaving the prism 3, the beam B is divided by a semi-transparent mirror 6 or a prism. The first part T, which is vertical, of the beam B is directed on the spectacle lens 7, while the second part F of the beam B meets on its path another light divider 8 behind which is a graduated scale 9

  and below which is placed a template 10. The

  partial beams 11 and 13 are superimposed as a result of the presence of the light divider 8 to form the beam

  F which is superimposed on the beam T thus allowing the use

  the device's user can simultaneously view the glass

  glasses 7, the graduated scale 9 and the template 10 when

  that the elements of the device, shown in FIG. 1 and above the glass 7, are raised and rotated from

  900. Eyeglass lenses may be bifocal and

  carry a part for close-up vision that can be detected distinctly in addition to the outlines of the glass by

  the observer and the user of the device. He is

  while it is possible to replace the optical elements described above with others which also make it possible to simultaneously observe the eyeglass lens, the jig and a

graduated scale or grid.

  The portion, carrying the spectacle lens 7, comprises a lower enclosure 15 comprising a bottom 16, side walls 17 and a cover plate

  18 which has a circular opening 19 whose function

  This is described in the following. A light source

  powered by unrepresented drivers is

  placed concentrically at the opening 19 on the bottom 16.

  A bushing 21 is provided on one of the sides of the enclosure 15. The interior of this bushing serves to house a vertical rod 22 carrying an arm 23 which can pivot in the direction of the double arrow 25 about the axis 24 from

  the rod 22 and this arm can be adjusted in height and in di-

  rection of the upper end 26 of the rod. The arm 23 can be maintained in its position close to

  the upper end 26 of the rod 22 and in a position

  rotated by 900 with respect to the position shown in FIG. l by means of a clamping screw 22a or other suitable means, so that the space above the spectacle lens 7 is freely accessible. The establishment of the retainer; for example a sucker, can be done by means of the arm 23 by bringing it

  in the position shown in FIG. 1.

  On the lower side of its free end, the

  arm 23 carries three fingers 27 equidistant, likewise long

  and directed down. The lower end of

  these fingers is covered by a cap 28 which is

  made of rubber or other anti-slip material and applied to the upper face of the spectacle lens 7. The rounded ends of the caps 28 are located

in the same horizontal plane.

  The support arm 23 has concentrically to the fingers 27 a vertical bore 30 in which can be introduced an insert 31 from the top. On one of the sides of this piece 31 is provided a protrusion or an arm 32 whose part 33 directed downwards

  penetrate into a bore 34 of the carrying arm 23

  thus singing piece 31 to turn around its long axis

  In the interior of the insertion piece 31 there is, sliding in height, a support 35 for a suction cup 36 which is applied to the upper face of the optical glass 7. After having the suction cup 36 can be detached from the support 35. It is also possible to replace the suction cup 36 and its support 35 by other known means.

  for setting up a grinding retaining member

  his. A translucent disk 37 is suspended from the cardan inside the circular opening 19 of the cover plate 18 of the enclosure 15, this disk being in its initial position in a horizontal plane and its center 38 being located in the middle axis of bore 30

  35 and the suction cup 36. The disc 37 is also

  concentric with the fingers 27 of the carrier arm 23 when the latter has been pivoted into position

represented in FIG. 1.

  The cardan suspension of disk 37 is made

  by means of two journals 39, 40 (FIG 2) whose axis passes radially through the center 38 of the disc 37 and is connected by them so as to be pivotable with a ring 41, which is itself suspended from pivotally with the cover plate 18 through the intermediary of

  two other pins 42, 43 whose axis passes through the center

  the disk 38 * n forming an angle of 900 with the axis of the trunnions 39, 40. The disk 37 is translucent and bears, concentrically, with respect to its center 38,

  three fingers 44, 45 and 46 which can also be re-

  wearing hoods 47 (Fig. 1). The lower face 48 of the spectacle lens 7 rests, without being able to slide, on these

  47. The height of the fingers 44, 45, 46 has been cal-

  such that the area of the glass 7 closest to the disc 37 (marginal area 49 in Fig. 1) does not come into contact with or come into contact with the disc 37 at the different positions of the glass 7, without impairing the good

  application of the latter on the fingers 44, 45 and 46.

  When the support arm 23 is pivoted in the position illustrated in FIG. 1, the fingers 44, 45, 46 are

  in position coaxial with the fingers 27 of the arm 23.

  In the embodiment according to FIGS. 3

  and 4, the fingers 27, according to FIG. 1, are not

  related to. carrier arm 23 but are carried as fingers 51, 52, 53 by another arm 50 while having the same position and the same orientation as the fingers 27 of FIG. 1. For this purpose the arm 50 carries a ring 54 which can be opened at 55 to form a fork and on which

  are arranged the fingers 51, 52, 53 forming a triangle.

  The inner edge 56 of the ring 54 then has a diameter which is greater than that of the suction cup 36, thus making it possible to lower the latter on the glass 7 by passing inside the ring 54. A ring 57 allows to adjust the arm 50 in height and in the direction of the arrow 58 on the sleeve 21 without however preventing it

  to turn until it has reached the de-

Siree.

  In the embodiment shown in FIG. , the translucent disc 37 has a network 59 and, in the embodiment according to FIG. 6, a reticle whose abscissa 63 and ordinate 62 have

graduations 61.

  As shown in fig. 5, the disk 37 can also

  Instead of the fingers 44, 4y, 46 carrying caps 47, according to FIGS. 1 and 2, anti-slip tapes 65 which are oriented radially from the edge 64 towards the center; these ribbons hold the edge of the eyeglass lens without preventing the operation

  off-centering it on the disk 37.

  Fig. 7 shows that the lower face 66 of the disc

  37 may be contiguous to a lens 67 or to a filtering diffuser glass. The disk 37 can also be in

a colored matter.

  It is not necessary to provide the means in fig. 1 above the enclosure 15 when using different elements for the decentering of the

  glass of glasses and for the visualization of the jig.

  When using the device according to FIG. 1, the spectacle lens 7 is pivoted to the right out of the center of the bundle T and the median axis of the suction cup 36. The marginal zones of the lower face

  48 of the spectacle lens, which in the case of a glass

  gatif has a smaller radius than the upper face

  29, apply in positions of different heights

  47, 45 and 46. For this purpose the disc 37 of the cardan suspension pivots in a position in which the fingers 449, 45, 46 apply uniformly and through their caps. 47 against the lower face 48 of the glass 7, the caps 28 of the fingers 27 applied from above and in a horizontal plane on the glass 7. The effect obtained is identical when the disc 37 is provided with the radial strips 65. In this case the disk 37 also pivots, thanks to its cardan suspension, in a position in which the spectacle lens 7 rests uniformly on

  the ribbons 65 while being held with its upper face

  29 against the fingers 28 of the caps 27. At the uniform application of the glass 7 on the tapes 65 or on the caps 47 of the fingers 44, 45, 46, the surface 29 of the glass 7 is in a position in which the underside of the suction cup 36, or any other retaining member used, is parallel or substantially

  parallel to the surface 29 of the glass 7.

  Since the lower extremities of

  stanchions 28 are located in the same horizontal plane, the area of the upper face 29 of the glass 7, applying against the caps 28 and which is close to

  the central axis of the suction cup 36, forms a spherical surface

  and centered with respect to the caps 28 so that

  the suction cup 36 can be applied vertically and uni-

  formally on the upper face 29 of the spectacle lens 7, the caps 47 and the cardan disc 37

  occupying an inclined position.

Claims (6)

CLAIMS - Device for the off-centering of corrective eyeglass lenses and the introduction of a retaining member for the introduction of corrective glass in a machine intended to grind the edge of the latter, this device comprising a holder which holds the spectacle lens in an inclined and off-center position, and a support piece applied from the top to the lens and a device for positioning the retaining member on the spectacle lens, characterized in that the support for the spectacle lens is in the form of a disc 37 constituting the middle element of a cardan suspension.   2 - Device according to claim 1, characterized   terized in that the disk 37 is translucent and in that   a light source 20 is placed below the disk.   3 - Device according to claim 1, characterized   characterized in that the diameter of the support disc 37   with a cardan ring 41 is greater than the diameter   glasses of a value which corresponds at least to the greatest decentering of the latter and in that   that the upper face of the disc 37 has   non-slip rests 47, 65 holding the glass 7 in its marginal area.   4 - Device according to claim 3, characterized   characterized in that the non-slip fittings are con-   tituées by narrow and radial ribbons 65 which are arranged equidistantly.   Device according to Claim 1, characterized in that the translucent gimbal disc 37 carries vertical fingers 44, 45, 46 which are arranged   symmetrically and whose height is greater than the   maximum thickness of the lower face 48 of the glass of net 7.   6 - Device according to claim 1, characterized   characterized in that the disc 37 and the ring 41 are circular in shape and are mounted in a circular opening   a table or a cover plate 18 of the   the device 15 so as to be able to pivot in the plane of the plate.   7 - Device according to claim 1, characterized   characterized in that the translucent disk 37, constituting the middle element of the universal joint, has a graduated reticle 60 or a grating 59.   8 - Device according to claim 1, characterized   characterized in that a filtering lens or filtering glass 67 is attached to the underside of the middle disk 37 to the gimbal.