Hinge for an openable door or window frame

Abstract: Hinge (1) for an opening door or window frame including a first and a second knuckle part (2, 3) connected together by a pin (4) and assembled so as to allow adjustment between the first and second knuckle parts (2, 3) in a direction parallel to and in a direction perpendicular to the general plane of the door or window, respectively. For the purposes of adjustment perpendicular to the plane of the door or window, a sleeve (15) is provided which can be oriented inside the second knuckle part (3). The sleeve (15) and the pin (4) have surfaces that come into mutual axial contact (22, 21) and are spherical in shape. Spherical surfaces are also provided between the sleeve (15) and a support (19) which is screwed into the bottom of the second knuckle part (3) in order to adjust the height of the first knuckle part (2).

Description: The present invention relates to hinges for an opening door or window frame, of the type comprising one first and at least one second knuckle part each provided with a leaf for fixing it to the movable frame and to the fixed frame respectively of the door or window; a pin which connects the first and second knuckle parts together such that they can rotate; and means allowing adjustments to be made between the first and second knuckle parts. Hinges of this type are currently used in a multitude of applications, including on relatively heavy doors in which the frames consist of metal sections. In these applications, adjustment between the first and the second knuckle parts of the hinges on the door frame, in other words between the movable frame and the fixed frame, is usually possible both in a direction parallel to and in a direction perpendicular to the general plane of the door, advantageously independently of each other. Adjustment perpendicular to the general plane of the door in particular serves to adjust the compression force on the seal, which is usually provided on one of the two frames, so as to give the optimum compression value to ensure a seal against external agents. Adjustment in a direction parallel to the general plane of the door, on the other hand, serves to adjust the gap between the movable frame and the frame proper. Italian Utility Model Application No. TO97U000055 in the name of the present Applicant (corresponding to WO 9841720) discloses a hinge for an opening door or window frame of the type defined above, in which the means allowing adjustment between the first and second knuckle parts perpendicular to the general plane of the door or window include a sleeve which is inserted into the second knuckle part such that it can be oriented angularly and which has an eccentric cylindrical cavity into which the pin is inserted. The sleeve and the second knuckle part have mutual keying means designed to allow stable orientation of the sleeve in a plurality of different relative angular positions. This adjustment system has the advantage of allowing particularly practical, easy and rapid adjustment between the movable frame and the fixed frame of the door or window, perpendicularly to the latter's general plane. From DE 8914003U a hinge for windows is known, comprising one first and one second knuckle part and a pin which connects the first and second knuckle parts together, and means allowing adjustments to be made between the first and second knuckle parts in a direction perpendicular to the general plane of the window. The adjustment means include a sleeve which is inserted within the second knuckle part and can be oriented angularly. The sleeve has an eccentric cylindrical cavity into which the pin is inserted, and both the pin and the sleeve have respective spherical surfaces into mutual contact. US-A-5755011 discloses a similar hinge wherein the sleeve and the lower support have respective mating spherical surfaces which are convex towards the pin, while the pin and the sleeve have respective mating flat surfaces. The present invention constitutes an improvement to the subject-matter of the abovementioned Italian Utility Model Application No. TO97U000055 and, more specifically, its object is to make the hinge self-centring, especially with regard to the axial alignment between the pin and the second knuckle part, so as to eliminate any negative effects that may arise due to play introduced during construction or assembly between these components of the hinge. According to the invention this object is achieved by a hinge for an opening door or window frame as set forth in Claim 1. In this way three spherical surfaces are defined which will ensure a perfect self-centring action between the pin, which is fixed to the first knuckle part of the hinge, and the adjustment unit associated with the second knuckle part. The invention will now be described in detail and with reference to the appended drawings which are supplied purely by way of non-limiting example and in which: Figure 1 is a schematic view in elevation of a hinge for an opening door or window frame according to the invention, Figure 2 is a plan view of Figure 1, Figure 3 is view in vertical section on the plane III-III of Figure 2, and Figure 4 is a partially exploded perspective view of the hinge as applied to a door or window frame. In the drawings, the general reference 1 denotes a hinge according to the invention for an opening door or window frame, particularly, but not exclusively, for heavy doors and essentially comprising a first knuckle part 2 and a second knuckle part 3 which are placed axially one on top of the other and are connected together such that they can rotate by means of a pin, denoted as a whole by the reference 4. The first knuckle part 2 is formed as a single piece with a leaf 5 which, in conjunction with screws (not shown) inserted into holes 6, serves to fix the hinge to an upright of a movable frame F (Figure 4) of the door. Similarly, the second knuckle part 3 is formed as a single piece with a leaf 7 which, in conjunction with screws (not shown) inserted into holes 8, serves to fix the hinge to a corresponding upright of the fixed frame M (Figure 4) of the door. The pin 4 includes a lower part 9 which projects out from the bottom of the first knuckle part 2 and is inserted, as will be explained below, into the second knuckle part 3, and an upper part consisting of a cam, denoted by the general reference 10, which is rigidly connected to the lower part 9. The cam 10 can be made to rotate inside the cavity 11 of the first knuckle part 2 such that it causes only a relative translational movement between the first and the second knuckle parts 2, 3 - and therefore of the movable frame F relative to the fixed frame M - in a direction parallel to the general plane of the door. In a manner described in a co-pending patent application filed on the same date by the Applicant, this enables the gap between the movable frame and the fixed frame to be adjusted. Once such adjustment has been made, the cam 10 is prevented from rotating relative to the first knuckle part 2 by tightening a lateral grub screw 12. The lower part 9 of the pin 4 is engaged in a manner such that it can rotate inside the cavity 14 of a sleeve 15 which is usually made out of a self-lubricating plastic material with a low coefficient of friction. The cavity 14 of the sleeve 15 is eccentric relative to the second knuckle part 3 and the sleeve 15 has an annular flange 16 at the top which bears on the top edge of the second knuckle part 3. Moreover, the sleeve 15 is closed off at the bottom by a bottom wall 22, thus exhibiting an overall beaker-like shape so that it can also advantageously act as a reservoir for a lubricant. The side wall of the sleeve 15 has one or more (advantageously three) spline-like axial projections 17 on the outside which are designed to engage in a series of longitudinal grooves 18 on the inside of the knuckle part 3. This mechanism is generally known from Italian Utility Model Application No. TO97U000055 referred to above, and allows adjustment between the first knuckle part 2 and the second knuckle part 3 in a direction perpendicular to the general plane of the door - in other words it allows adjustment of the pressure between the movable frame F and the fixed frame M. During assembly, the sleeve 15 is oriented by positioning the splines 17 in the grooves 18 corresponding to the desired value for the pressure between the movable frame F and the fixed frame M. Of course this pressure value, which is usually set by the door manufacturer, can be modified by the person installing the door by positioning the splines 17, i.e. the sleeve 15, in the most suitable angular position. The hinge also includes a screw-like element 19 which is engaged in a lower tapped portion 20 of the second knuckle part 3 in order to adjust the vertical position of the sleeve 15 and, therefore, the height of the pin 4 and thus of the first knuckle part 2 relative to the second knuckle part 3. According to the invention the internal contact surface between the lower part 9 of the pin 4 and the sleeve 15 on the one hand, and the external contact surface between this sleeve 15 and the threaded element 19 on the other, are spherical in shape in order to produce a self-centring action between the pin 4, and thus the first knuckle part 2, and the second knuckle part 3. More specifically: the free end of the lower part 9 of the pin 4, denoted by the reference 21, and the bottom wall 22 of the cavity 14 of the sleeve 15 have a hemispherical and mutually complementary shape. Similarly, the base of the sleeve 15, denoted by the reference 23, and the top 24 of the threaded element 19 both have an essentially hemispherical and mutually complementary shape. In the example illustrated the radius of the spherical surfaces 21 and 22 is smaller than the radius of the spherical surfaces 23 and 24. Protective caps 25, 26 are usually applied, in a manner such that they can be removed, to the top of the first knuckle element 2 and to the base of the second knuckle element 3, respectively. It is worth noting that the invention can also be applied to hinges fitted with two, rather than just one, knuckle parts for fixing the hinge to the fixed frame of the door or window. Needless to say, constructional details and particular embodiments may be amply varied with respect to those described and illustrated, without thereby departing from the scope of the present invention, as defined in the following claims.

Claims: Hinge (1) for an opening door or window frame, comprising one first and at least one second knuckle part (2, 3) each provided with a leaf (5, 7) for fixing it to the movable frame (F) and to the fixed frame (M) respectively of the door or window, a pin (4) which connects the said first and second knuckle parts (2, 3) together such that they can rotate, means allowing adjustments to be made between the said first and second knuckle parts (2, 3) in a direction perpendicular to the general plane of the door or window, the said adjustment means including a sleeve (15) which is inserted into the said second knuckle part (3) such that it can be oriented angularly and has an eccentric cylindrical cavity (14) into which the said pin (4) is inserted, and a lower support (19) for the said sleeve (15), engaged inside the said second knuckle part (3) such that it can move axially so as to adjust the height of the said sleeve (15) relative to the second knuckle part (3), characterized in that said sleeve (15) and said pin (4) as well as said sleeve (15) and said lower support (19) have respective axially mating surfaces (22, 21; 24, 23) which are spherical in shape, said surfaces (22, 21; 24, 23) being concave with their concavity facing towards said first knuckle part (2). Hinge according to Claim 1, characterized in that the sleeve (15) has a bottom wall (22) which closes off its cavity (14), the said bottom wall (22) and the end (21) of the pin (4) that faces it both having a substantially hemispherical mutually complementary shape. Hinge according to Claim 1, characterized in that the said sleeve (15) acts as a reservoir for a lubricant. Hinge according to any one of the preceding claims, characterized in that the said sleeve (15) and the said second knuckle part (3) have mutual keying means (17, 18) designed to allow stable orientation of the sleeve (15) in a plurality of different relative angular positions. Hinge according to any one of the preceding claims, characterized in that the said lower support (19) is screwed into the said second knuckle part (3).

Inventors: BALBO DI VINADIO AIMONE, BALBO DI VINADIO, AIMONE
Applicants: SAVIO SPA, SAVIO S.P.A.
Application year: 2000
Main classification: E05D7
IPC codes: E05D7, E05D5