WO2003050595A1

WO2003050595A1 - Improved spectacles and a method for their manufacture

Info

Publication number: WO2003050595A1
Application number: PCT/IT2001/000622
Authority: WO
Inventors: Vittorio Tabacchi
Original assignee: Safilo Societa' Azionaria Fabbrica Italiana Lavorazione Occhiali S.P.A.
Priority date: 2001-12-10
Filing date: 2001-12-10
Publication date: 2003-06-19
Also published as: AU2002217437A1

Abstract

A pair of spectacles is described and comprises at least one lens (2) provided with at least one recess (9) constituting a seat for at least partially housing accessories such as a shoulder element (6) for the articulation of an arm (6) of the spectacles, a bridge element (8) to be supported on the nose, or a front crosspiece (41) connecting the arms. The recess (9) is extended by a through-hole (11) in the lens (2) for the locking of the accessories onto the lens, each accessory comprising a surface (6b; 8b; 42a) for abutting a corresponding surface (10a) of the lens and the through-hole (11) extending along an axis intersecting the abutment surface; the abutment surface (10a) in the lens is formed exclusively in the base of the recess (9). A method for the manufacture of the above-mentioned spectacles is also described.

Description

Improved spectacles and a method for their manufacture Technical field

The present invention relates to improved spectacles of the type including the characteristics specified in the preamble to main Claim 1. The invention also relates to a method for the manufacture of the above-mentioned spectacles. Technological background

The invention lies in particular in the specific field of rimless spectacles in which accessories of various configurations are locked directly onto the spectacle lens. The term "accessories" is intended to include herein, for example, the shoulders for the articulation of the arms, the bridge to be supported on the nose, or a front crosspiece which extends along an arcuate eyebrow profile between the arms and which can support the lenses.

An example of spectacles including the characteristics indicated above is known from European patent application No. 953862. Described therein is a system for locking the accessories (such as the shoulders for the articulation of the arms and/or the bridge to be supported on the nose) which provides for the formation of an elliptical recess, formed so as to extend through the lens, or extended by a hole which in turn extends through the lens, for the screw-clamping of the accessory, partially housed in the recess. In a first example known from the above-mentioned document, a flat surface of the accessory is placed in abutment with one of the opposed surfaces of the lens, which surfaces normally have predetermined curvature. One of the limitations which may be encountered in this locking system is that the abutment contact between surfaces with different curvatures does not allow them to bear on one another with a uniform distribution of the clamping load with which the accessory is locked onto the lens. As a result, there is a localized concentration of the load with stress peaks which may compromise the stability of the clamping and/or may damage the lens. Moreover, this stress concentration affects a peripheral region of the edge of the lens in which the lens is also drilled, resulting in greater risks of breakage of the lens.

A second example known from the same document cited provides, in addition to the above-mentioned abutment of the accessory against an outer surface of the lens, for a further abutment contact to take place between the base of the recess and a corresponding and facing surface of the accessory. However, for correct locking, this double abutment requires extremely precise coupling tolerances between the respective surfaces, in the absence of which the abutment is achieved to a limited extent either on the outer surface of the lens or within the recess, resulting in variable stability of the locking and a non-uniform spread and distribution of the load with localized stress increment. Description of the invention

The technical problem underlying the present invention is that of providing spectacles and a method for their manufacture which are designed to overcome all of the disadvantages discussed with reference to the prior art cited.

This problem is solved by the invention by spectacles and by a method according to the appended claims. Brief description of the drawings

The characteristics and the advantages of the invention will become clearer from the following detailed description of a preferred embodiment described, by way of non-limiting example with reference to the appended drawings, in which:

- Figure 1 is a partial plan view of a first embodiment of spectacles formed in accordance with the invention, - Figure 2 is a view of a detail of the spectacles of Figure 1 , with parts separated,

- Figure 3 is a partial plan view of a second embodiment of spectacles according to the invention,

- Figure 4 is a view of a detail of the spectacles of Figure 3 with parts separated, - Figure 5 is a partial plan view of a third embodiment of spectacles according to the invention,

- Figure 6 is a partial perspective view of a detail of the embodiment of Figure 5,

- Figure 7 is a front elevational view of a detail of Figure 5, - Figure 8 is a partial plan view of a fourth embodiment of spectacles according to the invention,

- Figure 9 is an enlarged, partially-sectioned, plan view of a detail of Figure 8,

- Figure 10 is a perspective view of a further detail of Figures 8 and 9,

- Figure 11 is a partial view showing a variant of a detail of Figures 8 to 10, in section,

- Figure 12 is a partial view showing a fifth embodiment of spectacles according to the invention, in section,

- Figure 13 is a view showing a variant of the embodiment of Figure 12, in section,

- Figure 14 is a partial plan view showing a detail common to the spectacle embodiments of the preceding drawings, on an enlarged scale,

- Figures 15, 16 and 17 are views corresponding to that of Figure 14 showing respective variants of the detail shown,

- Figures 15a, 15b, 15c, 15d, 15e and 15f are plan views showing further variants of the embodiments of Figures 15 to 17, in axial section, - Figure 18 is a partial plan view of a sixth embodiment of spectacles according to the invention,

- Figure 19 is a perspective view of a detail of the spectacles of Figure 18 with parts separated,

- Figure 20 is a perspective view of a further variant of the embodiments of the invention of Figures 5 to 11 ,

- Figures 21 to 23 are partial views showing the variant of Figure 20 in section, with different elements for locking the lens onto the accessory,

- Figure 24 is an exploded perspective view of the variant of Figure 22, - Figure 25 is a perspective view of a further variant of the embodiment of the invention of Figures 18 and 19,

- Figures 26 to 28 are partial views showing the variant of Figures 25, in section, with different elements for locking the lens onto the accessory, - Figure 29 is an exploded perspective view of the variant of Figure 26,

- Figure 30 is an exploded perspective view of a further variant of the embodiment of Figure 25,

- Figures 31 and 32 are partially-sectioned views of the variant of Figure 30 with different elements for locking the lens onto the accessory, - Figure 33 is a schematic side elevational view of a device for implementing the method of the invention,

- Figures 34 and 35 are schematic side elevational views of respective variants of the device for implementing the method of the invention,

- Figure 37 is a partial front elevational view of a tool designed to operate in accordance with the method of the invention,

- Figures 38 and 39 show, in plan and in section, respectively, a detail of the invention produced by the tool of Figure 37,

- Figures 40 and 41 show, in plan and in section, respectively, a variant of the invention produced by the tool of Figure 37, - Figures 42 to 47 show, in plan and in axial section, further variants of the embodiments of Figures 38 to 41 , and

- Figure 48 is a plan view of a common variant of a detail of the embodiments of the preceding drawings.

Preferred embodiment of the invention With reference initially to Figure 1 , this shows a first embodiment of a pair of spectacles, generally indicated 1 , of which a lens 2, an arm 3, and an opposed bridge 4 are shown only partially; it should be understood that the pair of spectacles comprises a further lens and a further arm which are identical but arranged in reflectively symmetrical positions.

Only the end portion 5 of the arm 3 closest to the lens 2 is shown and it should be understood that the intermediate portion and the remote end are of conventional shape. The end portion 5 comprises a part 5a substantially aligned with the intermediate portion and an end part 5b shaped as an eye. The arm 3 is articulated to the lens 2 by means of a first hinge element 6, which is also known by the term "shoulder" in the specific technical field, a hinge pin 7, and a second hinge element constituted by the eye. Only the half of the bridge 4 which is fixed to the lens 2 is shown in Figure 1 and it should be understood that the bridge is reflectively symmetrical with respect to a plane defined by the axis X of Figure 1 . The bridge 4 comprises an upper connecting portion 4a and opposed portions 4b (of which only one is shown in the drawing) carrying respective nibs with small pads 7a for bearing on the nose. Each portion 4b and the corresponding end of the upper portion 4a are connected by a respective element 8 for connecting the bridge to the lens 2.

For convenience of explanation, the above-mentioned shoulder and bridge of the spectacles are also indicated generally by the term "accessories", the present invention relating to a common system for locking these accessories directly onto the spectacle lens. In particular, the system for connecting the shoulder 6 to the lens 2 will be described and it should be understood that an identical system distinguishes the connection of the bridge 4 to the lens. In this connection, similar details of these systems will be marked by the same reference numerals.

A recess 9 is provided for the above-mentioned connection of the lens 2 and extends from one of the opposed surfaces 2a, 2b of the lens, that is, in the drawings, from the surface indicated 2a, to a predetermined depth less than the thickness S of the lens, as far as a base 10 of the recess. The recess has a slotlike shape in cross-section and is further extended from the base 10 by a through- hole 1 1 which opens in the opposite surface 2b of the lens. The hole 1 1 is substantially perpendicular to the surface 10a of the base 10 of the recess.

The shoulder 6 comprises a portion 6a (8a in the connection element 8 of the bridge) having a lower surface 6b (8b in the element 8) for abutting a corresponding surface of the lens, this latter surface being constituted exclusively by the surface 10a of the base of the recess. In other words, the shoulder 6 is in abutment with the lens exclusively by means of the mutual contact between the surface 6b of the shoulder and the surface of the base 10 of the recess. These surfaces are advantageously flat and parallel to a theoretical plane of the lens, as well as substantially perpendicular to the axis of the hole and of the recess, indicated Y in the drawings. The mutual contact between flat surfaces ensures an advantageous uniform distribution of the load clamping the accessory to the lens and greater stability of the connection.

The clamping takes place by locking with a screw 12, the screw being inserted in the hole 1 1 with the head 12a of the screw in abutment with the surface 2b of the lens, in order to engage, by screwing, in an internally-threaded opening or hole 13 formed in the shoulder 6 and extending through the shoulder. As a result, the hole 13 is coaxial with and arranged as an extension of the hole 1 1 when the portion 6a of the accessory is housed in the recess 9. The portion 6a of the shoulder 6 also has a shape in plan such as substantially to fit the shape of the recess 9 in which it is housed so as to prevent relative rotary movements between the lens and the shoulder, about the axis Y, irrespective of the clamping action exerted by the screw locking.

According to a further characteristic of the invention, the slot-shaped recess 9 is formed in the lens 2 by the partial intersection of two cylindrical milling operations, the respective milled walls of the recess being indicated 9a and 9b. In the embodiment of Figure 14, the walls 9a, 9b partially penetrate one another, defining respective and opposed angles of intersection 14. The portion 6a of the shoulder 6 has interruptions 6c (8c in the connection element 8) located in positions such as to prevent interference with the angles 14 as a result of the fitting of the shoulder 6 in the recess 9. In Figures 14 and 16, the hole 11 has a diameter smaller than, and equal to, the diameters of the cylindrical millings 9a, 9b, respectively. In a further variant, the slot-shaped recess 9 may be produced by translation of the milling cutter in a direction perpendicular to the axis of the hole, and consequently without defining any angles 14. In this case, in Figures 15 and 17, the hole 11 may have a diameter smaller than, and equal to, the diameter of the cylindrical milling, respectively. Alternatively, and with reference to Figures 15a to 15f, the hole 11 may have a diameter larger than the diameter of the milling cutter with which the cylindrical milling is performed.

With reference now to Figures 3 and 4, a second embodiment of the spectacles according to the present invention, in which details similar to those of the previous embodiment are indicated by the same reference numerals, is generally indicated 20. The spectacles 20 differ from those of the previous embodiment mainly in that the accessories are housed in the respective recesses of the lens with the interposition of a respective first bush-like element 21 and, similarly, the screw 12 is inserted in the hole 11 with the interposition of a respective second bush-like element 22.

The first bush-like element 21 comprises a first portion 21a which is extended by a second portion 21 b coaxial therewith and of smaller diameter; these portions can be housed partially in the recess 9 and in the hole 11 , respectively. The shoulder portion between the two portions 21 a, 21 b is defined by opposed surfaces 21c, 21 d which can abut the surface 6b (8b) of the accessory and the base surface 10a of the recess, respectively. Both couplings between the above-mentioned surfaces are advantageously made between flat surfaces. The second bush-like element 22 has an annular body 22a which can be interposed between the head 12a of the screw and the surface 2b of the lens, and which is extended by a circumferential lip 22b that can be housed in the hole

11. The use of a washer 23 interposed between the bush 22 and the screw 12 is also envisaged.

The bushes 21 and 22 are preferably made of plastics material and are advantageously provided in spectacles the accessories of which are made of metal, so as to afford adequate protection for the surface of the lens during the clamping of the accessory thereto. Figures 5 to 7 show a third embodiment of the spectacles according to the present invention, generally indicated 30, in which details similar to those of the previous embodiments are indicated by the same reference numerals.

The spectacles 30 differ from the previous embodiments in that the accessory, whether it be the shoulder or the bridge of the spectacles, has a projection 31 from which a threaded shank 32 extends for insertion in the hole 11 for the screw-locking of the lens onto the accessory.

The projection 31 is of a shape such as substantially to fit the shape of the slotted recess 9 in which it is housed and projects beyond the profile of the lens surface 2a when it is housed in the recess 9 so that the accessory is in abutment with the lens exclusively on the surface of the base of the recess.

For the screw locking, a nut 33 is provided or, alternatively, a locking bush 34 having an internally threaded axial through-hole 35 and an outer cylindrical skirt 36 extending into a hemispherical, cylindrical, or polygonal (for example, hexagonal) head 37. It will be noted that the skirt 36 is housed in the hole 11 in the lens during the screw locking of the lens to the accessory (Figure 5). As an alternative to the screw locking, the shank 32 may have a plurality of projections or knurling for facilitating locking in the bush 34 by pressure.

With reference to Figures 8 to 11 , a fourth embodiment of spectacles according to the present invention is generally indicated 40. The spectacles 40 differ from the previous embodiments in that they have a front crosspiece 41 extending along an arcuate eyebrow profile at the opposite ends of which it is articulated to the arms 3. The crosspiece 41 is arranged to support the lenses 2 and, in this connection, is provided, for each lens, with at least one projection 42 which is formed in identical manner to the projection 31 and from which a threaded shank 43 extends to be housed in the through-hole 1 1 of the lens. The locking between the accessory (the crosspiece 41 ) and the lens mirrors the system of the previous embodiment and can be achieved by means of a nut 44 or alternatively a bush 46. In the latter case, as an alternative to the thread, the shank 43 may have a plurality of circumferential projections for facilitating locking in the bush 46 by pressure.

It is pointed out that, in this embodiment also, the abutment of the accessory against the lens is limited to the mutual contact between the base surface of the recess and a corresponding surface 42a of the projection 42 which faces it.

Moreover, for a metal frame, a bush-like element of similar structure to the above-mentioned element 21 may be interposed between the projections 31 and 42 of the preceding embodiments and the lens, with the function of protecting the lens.

Figure 12 shows partially a fifth embodiment of the invention, generally indicated 50. The spectacles 50 differ from the previous embodiments mainly in that the lens 2 has inner and outer surfaces 2a, 2b having marked difference in curvature. In a variant of the spectacles 50, an adapter element 51 is interposed between the accessory, whatever it may be, and the lens; the adapter has an end 51 a which can be housed in the corresponding recess 9 and, at its opposite end 51 b, has a seat 52 for at least partially housing a portion of the accessory. The adapter 51 also has a central through-hole 53 which opens in the seat 52 and forms an extension of the hole 11 in the lens for screw-locking of the accessory. The base surface 10a of the recess advantageously extends parallel to a plane tangential to the surface 2a of the lens at the intersection of the axis of the hole 11 with that surface.

The seat 52 is arranged to comprise a base surface 52a intersecting the plane containing the opposed abutment surface housed in the recess 9. This enables the lens to be locked onto the accessory correctly when the lens has a marked difference in curvature between the inner and outer lens surfaces. Figures 18 and 19 show a sixth embodiment of the spectacles according to the invention, generally indicated 60, in which the accessory, whether it be the shoulder, the bridge, or the front crosspiece, is connected to the lens by press- fitting of an appendage 61 , preferably of prismatic shape, in a bush 62 having a through-hole of rectangular cross-section. The base surface of the recess is also arranged to abut a corresponding surface of the bush 62.

In a further variant of the invention, which is common to all of the embodiments described above, the hole 11 extending through the lens 2 is arranged to be slot-shaped and preferably has a slot-shaped cross-section which is elongate in a direction parallel to the longitudinal axis of the cross-section of the recess 9.

In a first embodiment of this variant, shown in Figures 20 to 24, the shank 32, 43 extending from the respective projection is arranged to have a cross- section shaped so as to be housed in the slot-shaped through-hole. In Figure 20, the shank has a substantially rectangular cross-section, possibly with rounded or blunted corners. The partially flattened shape of the shank enables it to be locked in a corresponding bush by pressure, with the aid of knurlings or projections formed on the outer surface of the shank. Figures 21 , 22 and 23 show, as locking means, a ring 33a, a bush 46a with a blind hole 46b, partially housed in the slot-shaped hole 11 , and a bush 34a with a through-hole 35a, respectively.

In a second embodiment of the above-mentioned variant, shown in figures 25 to 29, the appendage 61 of the previous embodiments, which extends from the accessory, is arranged to have a cross-section of a shape such as to be housed in the corresponding slot-shaped through-hole 11. In Figure 25, the appendage 61 has a substantially rectangular cross-section with rounded or blunted corners but may alternatively have a purely rectangular cross-section. The partially flattened shape of the appendage 61 enables it to be locked in a corresponding bush by pressure with the aid of knurlings or projections formed on the outer surface of the bush. Figures 26, 27 and 28 show, as locking means, a bush 62a with a through-hole, partially housed in the recess 9, a bush 62b with a blind hole, and a bush 62c with a through-hole and with a recessed cross-section 62d to enable it also to be housed partially in the slot-shaped through-hole 11. It will be noted that, according to the variants described, the slot-shaped recess 9 may be formed either from the outer surface of the lens or from its inner surface.

In the second above-mentioned embodiment (Figure 63) two parallel and spaced-apart, cylindrical appendages are optionally arranged to extend from the accessory and, after insertion in the slot-shaped hole 11 , can engage a bush 64 provided with corresponding holes 65. Mutual locking is achieved by press-fitting of each appendage 63 in the corresponding hole, facilitated by knurlings or projections formed on the outer surfaces of the appendages. The bush 64 is arranged in abutment with the base of the recess (Figures 31 and 32) and may have a portion which can be housed in the slot-shaped through-hole (Figure 32). With reference to Figure 48, as a further variant common to all of the embodiments described, the through-hole 11 may be formed eccentrically relative to the axis of the slot-shaped recess 9. In a preferred embodiment of the invention, a method for the manufacture of the spectacles provides for the series of steps described below.

Each lens 2 is drilled, in a first step, to produce the through-hole 11 by substantially conventional drilling techniques. The lens is then located in a device, generally indicated 70, by the engagement of a locating pin 72 in the hole 11.

The lens is then subjected to a first cylindrical milling operation with an axis parallel to and spaced from the axis of the hole 11. The preselected depth is achieved and the milling is located by a type of locating guide or template 73 which is incorporated in the device 70 and a further separate plan view of which is provided in Figure 33.

The first milling operation is performed with partial penetration of the hole 11 and to a depth less than the thickness of the lens. This milling therefore forms the respective wall 9a of the slot-shaped recess 9. In a subsequent step, a second cylindrical milling operation is performed, also guided by the locating guide 73, with an axis parallel to and spaced from the axis of the hole and arranged in a reflectively symmetrical position relative to the axis of the first milling operation. This second milling operation forms the respective wall 9b of the recess. The interaxial spacing selected is such that the milling operations, which are performed to the same depth, intersect at least partially to produce a substantially slot-like shape of the recess. The milling process also enables a recess base 10a with a flat surface to be produced, constituting a surface for abutting the corresponding surface of the accessory.

For the slot-shaped recess of Figures 15 and 17, once one of the walls 9a, 9b has been formed, the milling tool is translated in a direction perpendicular to the axis of the hole 11 to form the other wall of the recess. In this case, moreover, it is not necessary for the holes to intersect.

It should be understood that, for slot-shaped recesses having the shape shown in Figures 12 and 13, the milling tool, is translated along an axis intersecting the axis of the hole 1 1 at a predetermined angle correlated with the curvature of the surface of the lens in which the recess is formed.

Figures 34, 35 show a variant of the device in different operative stages by which the above-described method is executed to form slot-shaped recesses in the configurations indicated. In particular, the apparatus comprises a support 74 on which the inner surface of the lens 2 is arranged to bear and in which the locating guide 73 is locked, for example, by gluing. The pin 72 is also arranged to be housed removably in a seat in the guide which in turn is intended to house the tool after the initial locating hole. In Figure 36, the apparatus is shown in the configuration in which it is arranged for the formation of the slot in the outer surface of the lens.

For the formation of recesses with slot-shaped through-holes 1 1 , the use of a tool carrying a pair of coaxial milling cutters having different diameters is also envisaged, as shown in Figure 37. With these tools it is possible to produce recesses having the configurations shown in Figures 38 to 41 , in which the initial locating hole is indicated in chain line. In the recess of Figures 38 and 39, the double slot of the recess 9 and of the through-hole 1 1 is formed by means of two separate, partially intersecting axial milling operations whereas, in the recess of Figures 40 and 41 , the double slot is formed by translation of the tool in a direction perpendicular to the axis of the hole.

Moreover, the initial hole 1 1 may have a diameter smaller than, larger than, or equal to the diameter of the milling cutter with which the hole is milled to form a slot, as shown in Figures 42 to 47. The invention thus solves the problem posed, achieving many advantages over known solutions.

A first advantage is that the spectacles according to the invention enable the accessory to be locked directly onto the lens with respective flat abutment surfaces, regardless of the curvature of the lens surface, for a correct and uniform distribution of the clamping load, ensuring improved stability of connection. This advantage is also achieved, according to the invention, in spectacles formed with lenses having a marked difference in curvature between their inner and outer surfaces.

A second advantage is that, by virtue of the provision of the threaded through-hole in the accessory, it is possible to engage therein different lengths of locking screws so that the accessory can be mounted on lenses of different thicknesses with screws of a single and specific length. Another advantage is that the slot-shaped recess for the locking of the accessory onto the lens is produced by quick and easy operations with short machining times and low costs.

Yet a further advantage is that, for spectacles having lenses supported by a front crosspiece, the locking of each lens can take place by the provision of a single slot-shaped recess in the lens, clearly permitting quicker execution and limiting related costs.

A further advantage is that, with the method according to the invention, it is possible to use the same apparatus to produce a combination of slot-shaped recesses and through-holes of different geometrical shapes, simply by variation of the diameter of the initial hole and of the shape of the tool.

Claims

1. Spectacles comprising at least one lens (2) provided with at least one recess (9) constituting a seat for at least partially housing accessories such as a shoulder element (6) for the articulation of an arm (3) of the spectacles, a bridge element (8) to be supported on the nose, or a front crosspiece (41 ) connecting the arms, the recess (9) being extended by a through-hole (11 ) in the lens (2) for the locking of the accessories onto the lens, each accessory comprising a surface (6b; 8b; 42a) for abutting a corresponding surface (10a) of the lens and the through-hole (11 ) extending along an axis intersecting the abutment surface, characterized in that the abutment surface (10a) in the lens is formed exclusively in the base of the recess (9).

2. Spectacles according to Claim 1 in which the through-hole (11 ) is substantially perpendicular to the abutment surface (10a).

3. Spectacles according to Claim 1 or Claim 2 in which the abutment surface (10a) in the lens is flat and substantially parallel to the plane of the lens (2).

4. Spectacles according to any one of Claims 1 to 3 in which the recess (9) is produced by partial intersection of two cylindrical milling operations.

5. Spectacles according to one or more of the preceding claims in which each of the accessories (6; 8) comprises an opening (13) which is coaxial with and is arranged as an extension of the hole (11 ) when the accessory is housed in the recess (9).

6. Spectacles according to Claim 5 in which the opening (13) extends through the respective accessory.

7. Spectacles according to Claim 5 or Claim 6 in which the opening (13) is internally threaded for screw-locking of the corresponding accessory (6; 8) onto the lens through the hole (11 ).

8. Spectacles according to one or more of the preceding claims in which each of the accessories has a shape substantially fitting the shape of the recess (9) in which it is housed so as to prevent relative rotation between the lens and the accessory.

9. Spectacles according to one or more of Claims 3 to 8 in which the portion of the accessory (6; 8) which is housed in the recess (9) comprises interruptions (6c; 8c) located in zones of intersection of the cylindrical milling operations by which the recess (9) is formed so as to prevent interference in the fitting of the accessory in the corresponding recess in the lens.

10. Spectacles according to one or more of the preceding claims in which each accessory further comprises an adapter element (51 ) which can be interposed between the spectacle lens (2) and the respective shoulder (6), bridge (4), or front crosspiece (41 ), the adapter (51 ) comprising a surface (51a) for abutting a corresponding abutment surface (10a) in the lens (2), which surface (10a) is formed exclusively in the base of the recess (9).

11. Spectacles according to one or more of the preceding claims in which each accessory is housed in the respective recess (9) with the interposition of a first bush-like element (21 ) carrying a first surface (21 c) and a second surface (21 d) which can abut the abutment surfaces of the accessory (6; 8) and of the lens (2), respectively.

12. Spectacles according to Claim 11 in which the bush-like element comprises a first portion (21a) and a second portion (21 b) which are coaxial with one another and form extensions of one another, and which can be housed in the recess (9) and in the hole (11 ), respectively.

13. Spectacles according to Claim 11 or Claim 12 in which the accessories are locked onto the lens by means of a screw (12) extending through the hole (11 ) with the interposition of a second bush-like element (22) carrying an annular body (22a) interposed between the head (12a) of the screw and the corresponding surface (2b) of the lens, which faces the screw.

14. Spectacles according to one or more of the preceding claims in which each accessory comprises at least one element for the locking of the shoulder, the bridge, or the front crosspiece onto the lens.

15. Spectacles according to Claim 14 in which the at least one locking element comprises a nut (33; 44) or a bush (34; 34a; 46; 46a) for screw-locking of the lens onto the accessory.

16. Spectacles according to Claim 15 in which the bush is made of plastics material.

17. Spectacles according to one or more of Claims 1 to 14 in which the locking element comprises a bush (62; 62a; 62b; 62c) locked by pressure onto at least one appendage (61 ) extending from the respective accessory.

18. Spectacles according to Claim 17 in which the appendage (61 ) comprises a plurality of projections or knurling for facilitating locking in the respective bush by pressure.

19. Spectacles according to one or more of the preceding claims in which the through-hole (11 ) has a slot-shaped cross-section.

20. Spectacles according to Claim 1 or Claim 2 in which the abutment surface (10a) in the lens (2) is flat and extends parallel to a plane tangential to one or to the other of the opposed surfaces (2a, 2b) of the lens at the point of intersection of the axis of the through-hole (11 ) with the corresponding lens surface.

21. Spectacles according to one or more of the preceding claims in which the through-hole (11 ) is eccentric relative to the axis of the recess (9).

22. Method of manufacturing spectacles comprising at least one lens (2) provided with at least one recess (9) constituting a seat for at least partially housing accessories such as a shoulder element (6) for the articulation of an arm of the spectacles, a bridge element (8) to be supported on the nose, or a front crosspiece (41 ) connecting the arms, the recess (9) being extended by a through- hole (11 ) in the lens (2) for the locking of the accessories onto the lens, characterized in that the recess (9) is formed by two partially intersecting cylindrical milling operations.

23. Method according to Claim 22 in which, prior to the formation of the recess (9), the lens (2) is drilled to form the through-hole (11 ).

24. Method according to Claim 22 or Claim 23, comprising the following steps in succession:

- execution of a through drilling operation, forming the hole (11 ),

- locating of the lens (2) in a support (74) by engagement of the hole (11 ) on a locating pin (72),

- execution of a first cylindrical milling operation with an axis parallel to and spaced from the axis of the hole, the milling operation being performed to a predetermined depth less than the thickness of the lens (2),

- execution of a second cylindrical milling operation with an axis parallel to and spaced form the axis of the hole and arranged in a position reflectively symmetrical to that of the first milling operation, with respect to the axis of the hole, the second milling operation at least partially intersecting the first milling operation and being performed to a depth equal to that of the first milling operation.

25. Method according to Claim 24 in which the support (74) is resiliently yielding so as to adapt to different curvatures of the lenses.

26. Method according to Claim 24 or Claim 25 in which the support (74) is adjustable so as to adapt to different thicknesses of the lenses (2).

27. Method according to one or more of Claims 24 to 26 in which the milling operations are performed by guide means (73) for guiding the respective milling cutters, the guide means being located relative to the locating pin (72).

28. Method according to Claim 22 or Claim 23 in which the slot-shaped recess (9) is produced by translation of a cylindrical milling cutter in a direction perpendicular to the axis of the milling cutter.

29. Method according to one or more of Claims 22 to 28 in which the through-hole (11 ) is formed with a slot-shaped cross-section by the intersection of two parallel and spaced-apart cylindrical milling operations or by translation of a cylindrical milling cutter in a direction perpendicular to the milling axis.