FR2667347A1 - Articulated supports for doors and windows - Google Patents

Abstract

The invention relates to articulated supports. It relates to an articulated support which includes a member (10) in the form of a channel, in which a slider (20) can slide on which two connecting rods (15, 16) are articulated. The outer arm (13) for supporting the opening part of the window frame may merely have a limited opening movement because a stop member (24), in the form of an elongate bar, prevents it from moving because it is retained by a screw placed in a hole (25) formed in the stop member (24). Normally, the window can be opened only in a limited fashion, allowing ventilation. In the event of an emergency, the screw may be unscrewed and then allows wider opening of the window. Application to the articulated supports of doors and windows.

Description

The present invention relates to supports arti-

  abutments intended to connect a closing member to an associated frame so that they allow the opening and closing movements of the closing member in and out of the frame Examples of such

  closing devices are doors and windows.

  A commonly used articulated support comprises a channel-shaped member intended to be connected to one of the parts, an arm ensuring the connection to the other part and a linkage connecting the member in the form of

  channel in the arm so that it allows the opening movement

  at least one connecting rod of the linkage is articulated at one end on a slide which slides in the organ in the form of a channel so that it

guides the movement.

  The geometrical configuration of the linkage is generally such that a large opening movement is possible, for example so that the outside of a window can be cleaned from the inside by displacement of the internal vertical edge of the member. closing in the lateral direction with respect to the frame However, it is not always desirable that such a movement of total opening is allowed without restriction, since it can be dangerous for a child to be able to open a closing member with the

largest possible amplitude.

  The invention relates to an articulated support intended to connect a closure member to an associated frame, comprising a channel-shaped member intended to be connected to one of the parts, an arm intended to be connected to the other of the parts. and a linkage connecting the channel-shaped member to the arm so that it allows the opening and closing movement * of the closure member so that it leaves the frame and enters it, the linkage comprising at less a connecting rod articulated on a slide housed in the channel-shaped member so that it can slide, an elongated stop member being disposed along the channel-shaped member between the slide and a stop member formed on the organ

  channel-shaped so that it limits the movement of open

  ture of the slide, the elongated stop member being able to be separated manually so that it allows an additional opening movement of the slide.

  Other features and advantages of the invention

  tion will be better understood on reading the description

  which follows of five embodiments of the invention given purely by way of illustration with reference to the accompanying drawings in which: FIG. 1 is a side elevation view of a first articulated friction support having an arm in the open position , the figure showing a slide and a second stop member; Figures 2 A, 2 B and 2 C are respectively a side elevation view, a plan view and an end view of the second stop member of the first frictionally articulated support of Figure 1; Figure 3 is a side elevational view of a

  second articulated friction support having an arm in posi-

  opening, representing a slide and a retaining bar carried by the slide; Figures 4 A, 4 B and 4 C are respectively a side elevation view, a plan view and a sectional view along line AA of Figure 4 B of the retaining bar of the second frictionally articulated support of the Figure 3; Figure 5 is a side elevational view of a third friction-hinged support, an arm of the support being in the open position, the figure showing a slot and a screw which have the role of limiting the opening movement of the support Speak clearly; Figure 6 is a side elevational view of the third friction hinged support of Figure 5, showing the screw in the slot; Figure 7 is a section along the line VII-VII of Figure 6; FIG. 8 is a plan view of a fourth articulated window support comprising an arm shown in the partially open position and a stop member cooperating with a channel-shaped member of the articulated support; Figure 9 is a view similar to Figure 8 but showing the arm in a second partial opening position, the stop member cooperating with the channel-shaped member in a second position; Figure 10 is a view similar to Figures 8 and 9 but showing the arm in the fully open position; FIG. 11 is a plan view of a fifth embodiment of an articulated window support similar to that of FIGS. 8 to 10, but having a second form of stop member fixed to a slide of the articulated support and cooperating with a stop member formed on the channel-shaped member so that the arm is held in the partially open position; Figure 12 is a view similar to Figure 11 but in which the arm is in the fully open position;

  Figure 13A is a plan view of a button

  pusher of the articulated support of Figures 11 and 12; Figure 13 B is a section along line X-X of Figure 13 A; Figure 13 C is a section along the line Y-Y of Figure 13 A, but showing the push button in the channel-shaped member of the articulated support of Figures 11 and 12; Figure 14 A is an elevational view of a stop bar of the articulated support of Figures 11 and 12; Figure 14 B is a section of the stop bar of Figure 14 A; Figure 14 C is a view along arrow A of Figure 14 A; Figure 15 A is a plan view of an end portion of the slide of the hinged support of Figures 11 and 12; Figure 15 B is a side elevational view of the end of the slider shown in Figure 15 A; Figure 16 is a section of the spacer of the hinged support of Figures 11 and 12; Figure 17 is a schematic view of the end of the channel-shaped member of the articulated support of Figures 11 and 12, showing the spacer of Figure 16 placed in the channel-shaped member; and FIG. 18 is a partial view of a channel-shaped member of the articulated support of FIGS. 11 and 12 showing an ear pushed away from a flange

of the canal-shaped organ.

  We first refer to Figure 1; the first friction hinged support comprises an elongated base member 10 having a channel-shaped section having

  parallel guides 11 arranged along the respective edges.

  A linkage bearing the general reference 12 is supported

  ted by the member 10 in the form of a base channel and comprises an arm 13, a long connecting rod 14, an intermediate connecting rod

15 and two short connecting rods 16, 17.

  As shown in Figure 1, the long connecting rod 14 has a first end connected to the member 10 in the form of a channel by a fixed pivot 18 placed near a first end of the member 10 The other end of the long connecting rod 14 is connected to the arm 13 by a pivot 19 placed

between the ends of the arm 13.

  The intermediate link 15 and a short link 16 both have a first end connected to a slide 20 so that it can pivot around axes

  respective distant parallels 21, 22 forming pivots.

  The other end of the intermediate link 15 is connected

  tee between the ends of the long connecting rod 14 so that it can pivot and the other end of the first short connecting rod 16 is connected near one end of the arm 13, so that it also pivots The second short connecting rod 17 is arranged between the intermediate link 15 and the arm-13

  and is parallel to the long rod 14 The intermediate rod

  diary 15 is parallel to arm 13.

  The slide 20 comprises a block of general section

  rectangular rale whose sides are positioned in the guides 11 of the channel-shaped member 10 and are thus guided The slide 20 is therefore forced to slide along a straight line, along the member 10 in the form of

basic channel.

  The channel-shaped member 10 also includes a stop member 23 which protrudes along the path of the slide. The position of this stop member 23 is envisaged in

the following.

  A second stop member 24 (see FIGS. 2 A to 2 C)

  is in the form of an elongated bar of rectangular section

  laire having a hole 25 at a first end and a notch 26 near the hole During use, as shown in Figure 1, the bar is fixed by a quick release screw to the base member 10 and the notch 26

covers the stop member 26.

  When using the articulated fry support

  tion, the opening window frame (not shown) is mounted on a fixed window frame (not shown) by

  two articulated friction supports of the type described previously

  ment with reference to FIGS. 1 and 2 A to 2 C The member 10 in the form of the base channel of each articulated support is mounted on a respective opposite member of the fixed frame and the lateral members of the frame are connected to the arm 13 The linkage 12 allows movement of the window frame between an open position, in which the linkage is arranged as shown in FIG. 1, and a closed position In the closed position, the arm 13 and the connecting rods 14, 15, 16 and 17 are all aligned on the base channel-shaped member. A pointed end 27 of the arm 13 projects into a groove 28 formed by an end cap 29 mounted at a first end of the member 10.

basic.

  In the closed position, the slide 20 is placed near the cap 29 When the arm 13 moves to the open position, the slide 20 slides along the member 10 in the form of a channel, being retained by the guides 11 , until it is in contact with the end of the stop member 24 This forms a stop which prevents the additional opening movement of the arm 13 As shown in FIG. 1, the position of this member stop is such that only a limited opening movement is possible, sufficient for ventilation but insufficient for a person to pass through the window.

  If a wider opening movement is necessary

  saire, either in an emergency or for cleaning and decoration, the screw is removed from the hole 25 formed in the stop member 24 and this member 24 is separated from the base channel member The slide 20 is no longer limited, in its opening movement, by the stop member 24 and can continue to slide when the arm 13 opens, until the slide 20 is in contact with the member 23 In this position, the window is opened in a way that allows access to the external surface for cleaning and decoration and in a way

  which also allows exit through the window.

  It should be noted that the stop device is not obligatory

  roofing in the form of a bar It can also be in the form of a block or any other member which limits the movement of the slide 20 but which can be removed from

  its cooperation with the base organ.

  We now refer to Figure 3; the second articulated friction support comprises an elongated base member 30 and a channel-shaped section having parallel guides 31 arranged along the sides A linkage

  bearing the general reference 32, is supported by the

  base gane 30 and comprises an arm 33, a long connecting rod 34, an intermediate connecting rod 35 and three short connecting rods 36, 37, 38 As shown in FIG. 1, the long connecting rod 34 has a first end connected to the member 30 basic channel-shaped by a fixed pivot 39 placed near a first end of the member 30 The other end of the long connecting rod 34 is connected to the arm 33 by a pivot 40

  placed between the ends of the arm 33.

  The intermediate link 35 and another short link 36 both have a first end connected to a slide 41 so that they can pivot around distant parallel axes 42, 43 The other end of the intermediate link 35 is connected between the ends of the long connecting rod 34 so that it can pivot and the other end of the first short connecting rod 36 is connected near one end of the arm 33, also so that it can pivot The second and third short connecting rod 37, 38 are placed between the intermediate link 35 and the arm 33 and are parallel to each other and generally parallel to the long link 34 A

  intermediate link 35 is parallel to arm 33.

  The slide 41 comprises a block of general section

  rectangular rale whose sides are housed in the guides 31 of the member 30 and are guided by them Thus, the slide 41 is forced to slide along the member

basic, following a straight line.

  The member 30 in the form of a basic channel also comprises

  a stop member 44 which protrudes along the path of the slide

  bucket The role of this stop member 44 is considered in

the following.

  An elongated retaining bar 45 is connected at one end to the slider 41 so that it moves with the slider 41, and it is guided by the guides 11 during this movement For this purpose, as best represented in FIGS. 4A to 4 C, the retaining bar 45 has a channel-shaped section having parallel shoulders 46 which are in contact with the guides 31 A slotted or headless screw 47 is carried by the bar 45 at the end opposite to its connection to the slide 41 The role of this screw 47 is

  described in more detail below.

  When using the articulated fry support

  tion, a window opening frame (not shown) is mounted in a fixed window frame (not shown) by

  two articulated friction supports of the type described previously

  ment with reference to FIGS. 3 and 4 A to 4 C The basic member 30 of each articulated support is mounted on a respective opposite member of the fixed frame and lateral members of the frame are connected to the arm 33 The linkage 32 allows movement of the window part towards an open position in which the linkage is arranged as

  indicated in Figure 3, and towards a closed position.

  In the closed position, the arm 33 and the connecting rods 34, 35, 36, 37 and 38 are all aligned with the base member. A pointed end 48 of the arm 33 projects into the groove 49 formed by an end cap 50 mounted at a first end of the member 30 in the form of a base channel. In the closed position, the slide 41 is placed near the end cap 50 When the arm 33 moves to the open position, the slide 41 slides along the channel-shaped member 30, being retained by the guides 11, until it is in contact with the stop member 45 This forms a stop which

  prevents a greater opening movement of the arm 33.

  This stop member determines the maximum opening movement of the arm 33 However, if only a limited opening movement is necessary, the slotted or headless screw 47 placed on the bar 45 is moved downwards from the retracted position represented in FIG. 4, towards an advanced position When the screw 47 has this position, it is in contact with the stop member 44 well before the slide 41 is in contact with the stop member 44 and

  thus seriously limits the degree of openness available.

  The length of the bar 45 and the position of the screw 47 can be chosen so that the limited opening movement of the arm 33 is such that it allows adequate ventilation while leaving a space too small for a person to pass through the window, so that security is increased If a larger opening is necessary, either for greater ventilation or in an emergency, the screw 47 can be easily and quickly removed so that it allows movement. total opening. It should obviously be noted that the cooperation between the bar 45 and the stop member 44 is not necessarily achieved by a slotted or headless screw. It can be ensured by any other form of temporary latching device. We now refer to Figure 5; the third articulated friction support comprises an elongated base member 60 having a channel-shaped section comprising

  parallel guides 61 arranged along the respective edges.

  A linkage bearing the general reference 62 is supported

  ted by the member 60 in the form of a base channel and comprises an arm 63, a long connecting rod 64, an intermediate connecting rod

and a short connecting rod 66.

  As shown in Figure 5, the long rod 64 has a first end connected to a base member 60 by a fixed pivot 67 placed near a first end of the base channel 60 The other end of the long rod 64 is connected to the arm 63 by a pivot 68 placed between the

ends of the arm 63.

  The intermediate connecting rod 65 and the short connecting rod 66 both have a first end connected to a

  slide 69 so that they pivot on parallel pivots

  remote links 70, 71 The other end of the intermediate link 65 is connected between the ends of the long link 64 so that it pivots and the other end of the short link 66 is connected near one end

  of the arm 63, also pivotally The intermediate rod

  diary 65 is parallel to arm 63.

  The slide 69 comprises a block of generally rectangular shape, the sides of which are housed in the guides 61 of the basic member 60 in the form of a channel. Thus, the slide 69 is forced to move in translation along a straight line

along the organ 60.

  The basic member 60 in the form of a channel also comprises a stop member 72 which protrudes on the path of the slide 69 As indicated in FIG. 5, this limits the maximum opening movement of the arm 63 The member 60 base has an opening 73 placed between the stop member 72 and an adjacent end of the member 60 in the path of the

slide 69.

  The slide 69 carries a screw 74 which is better represented in FIG. 7 This screw 74 has an enlarged head 75 which, by rotation of the screw 74, can be moved between an advanced position shown in FIG. 7 and a retracted position in which head 75 is placed at a distance above the position indicated on

Figure 7.

  The role of the screw is to ensure a limited opening of the arm 13 As indicated in FIG. 6, if the head 75 of the screw 74 is moved towards the advanced position

  when the screw 74 is opposite the opening 73, the movement

  The opening and closing of the arm is prevented by cooperation of the head 75 with the opening 73 The movement of the head 75 towards the retracted position however allows a total range of movement of the slide-69, this range

  being limited only by the stop member 72.

  When using the articulated fry support

  tion, the opening window frame (not shown) is mounted in a fixed window frame (not shown) by

  two articulated friction supports of the type described previously

  ment with reference to FIGS. 5, 6 and 7 The basic channel-shaped member 60 of each articulated support is mounted on a respective opposite member of the fixed frame and the side members of the frame are connected to the arm 63 The linkage 62 allows a displacement of the window frame towards an open position in which the linkage has the position indicated in FIG. 5, and a position of closing it In the closed position, the arm 63 and the connecting rods 64, 65 and 66 are all aligned on the member 60 A pointed end 76 of the arm 63 projects into a groove 77 formed by an end cap 78 mounted at a first end of the member 60. In the closed position, the slide 69 is placed near the cap 78 When the arm 63 moves towards the open position, the slider 69 slides along the basic member 60 in the form of a channel while being held by the guides 61, until it comes into contact with the member stop 72 This for me a stop member which prevents an additional opening movement of the arm 63 and, as described above, the position of this stop member 72 is such that it ensures maximum opening

from the window.

  When the screw 74 is aligned with the opening 73, the arm 63 is only in the partial opening position which

  can be a position that allows proper ventilation

  but prevents entry or exit through the window.

  In this position, the screw 74 can be moved towards the

  advanced position in which it enters the opening

  ture 73 and prevents further opening movement

  or closing the window frame.

  It should obviously be noted that this blocking of the arm 63 in a limited open position is not necessarily obtained by contacting a screw head 75 with an opening 73 It can be obtained by any other locking device, for example by a sliding or rotary pawl mounted on the slide and which cooperates with the

  guides in another part of the base.

  The length of the opening can be increased so that the opening is elongated towards the end cap so that the arm can be moved between the closed and limited open positions when the head 75 of the

screw is in advanced position.

  We now describe two other types of articulated supports with reference to Figures 8 to 18 The basic construction of the two articulated supports is the same at the same time in Figures 8 to 10 (the fourth articulated support)

  and in FIGS. 11 and 12 (the fifth articulated support

  culé) We now describe this construction.

  The articulated support comprises a channel-shaped member 110, an arm 111, a long connecting rod 112, a short connecting rod 113 and an intermediate connecting rod 114 The channel-shaped member is metallic and has a base 115 and parallel side walls 116 protruding from the flanges 117 protruding inward from the edges of the

  side walls 116 and delimit a slot 118.

  The channel-shaped member 110 contains a sliding

  bucket 119, the edges of which enter the two opposite grooves delimited between the base 115, the side walls 116 and the flange 117 so that the slide 119 is

  forced to slide alternately along the member 110.

  The external face of the slide 120 projects through the slot 118 and the short connecting rod 113 and the intermediate connecting rod 114 are connected to the slide at distant locations along its length so that they pivot around parallel axes perpendicular to the base 115 The short connecting rod 113 is articulated at its other end on the first end

arm 111.

  The long connecting rod 112 is connected to the channel-shaped member 110 so that it can pivot around an axis perpendicular to the base 115 which is fixed relative to the channel-shaped member 110 The other end of the long rod 112 is articulated on the arm 111 at a point between the ends of the arm The end of the intermediate rod 114 distant from the slide 119 is

  articulated on the long connecting rod 112 between its ends.

  This configuration allows a movement of the arm 111 with a pivoting and translational movement relative to the channel-shaped member as shown in FIGS. 8 to 11 During this movement, the arm 11 is guided by the connecting rods 112, 113, 114 and the slide 119- moves from a position adjacent to a first end

  of the member 110 in the form of a channel towards an adjacent position

  centered at the other end of member 110, in which the

  long connecting rod 112 is connected to member 110.

  During use, the channel-shaped member is connected for example to a window frame and the arm 111 is connected to an associated window frame. The articulated support regulates the opening and closing of the window frame.

  window inside and outside the window.

  The articulated support shown in the drawings is only one of a large number of types of articulated supports which have a channel-shaped member and an arm connected by one or more connecting rods. It should be noted that the invention can 'apply to any such provision and is not limited to those shown in the drawings In addition, such articulated supports can be used with other closure members, for example

doors.

  We now refer to Figures 8 to 10; in the fourth articulated support, the slide comprises an elongated plate 120 of generally rectangular shape, disposed in a plane generally parallel to the plane of the base 115 and which is housed in the channel-shaped member, and it protrudes along of this member, in the direction of the slide opening movement 119 The plate is formed from a flexible material, for example spring steel, and it is curved upwards so that its free end is in contact with the faces lower flanges 117 The end of the plate 121 has two

  projections 121 facing upwards.

  The flanges 117 are formed with two cutouts 122, 123. During use, from the moment the arm 111 is in the position in which it covers the member 110 in the form of a channel, the opening movement of the arm 11 causes sliding of the slide 119 along the member 110 The projections 121 formed on the plate 120 are pushed back in contact with the internal surfaces of the

  flanges 117 and slide along these flanges 117.

  When the projections 121 reach the first cutouts 122, they penetrate the cutouts 122 and prevent an additional opening movement of the arm 111. This is the position shown in FIG. 8 In this position, an additional opening movement of the arms

111 is not possible.

  However, if the end of the plate 120 is pressed, for example with a finger, the projections 121 are

  separated from the first cutouts 122 and the movement of

  verture of the arm can continue However, when the projections 121 reach the second cuts 123, the projections come again in the cuts 123 and prevent any further opening movement of the

  arm This is the position shown in Figure 9.

  However, projections 121 may still be

  pushed away from the cutouts 123 so that they per-

  put an opening movement of the arm 111 which is

  follows until the plate 120 is in contact with the end of the channel-shaped member 110. This is the fully open position of the arm, shown on the

figure 10.

  The closing movement of the arm 111 causes an elastic return of the projections on the cutouts 122, 123, if

  although they do not hinder this closing movement.

  Reference is now made to FIGS. 11 to 18; as

  indicated above, the fifth articulated support represented

  felt in these figures is identical to that of Figures 8 to (except that it is symmetrical) We therefore do not describe its

construction in detail. In this embodiment, the slider 110 has two elongated bars

  stop 127 better represented in FIGS. 14 A, 14 B and 14 C Each stop bar 125 is elongated with flat upper and lower surfaces 126, 127 (see FIG. 14 B) and a V-shaped groove 128 formed along of an edge Near a first end, each bar

  stop at opening 129 and near the other end

  mitered, a wall of the V-shaped groove 128 is deformed so that it forms a projection 130 which effectively closes the

throat 128.

  The end of the slider is modified as shown in FIGS. 15 A and 15 B so that it forms two legs 131 which protrude from opposite sides of one end of the slider 119 Each leg 131 is housed in an opening 129 of a respective 125 stop bar, so

  that the bars are connected to the slide 119.

  Thus, each stop bar is arranged along a respective groove formed between the base 115, a side wall 116 and an associated flange 117 The thickness of each stop bar 125 (that is to say the distance between the upper and lower faces 126, 127) is

  less than the width of the associated groove.

  In this position, the two grooves in V 128 are turned towards one another, on either side of the member

shaped like a channel.

  The stop bars 125 carry a push button 132 which is better represented in FIGS. 13 A, 13 B and 13 C. the push button 132 comprises a plastic body having a generally rectangular shape in plan, having parallel guides 134 having a V section, arranged along the respective edges of the body 133 A

  upper face of the body 133 has ribs 135.

  As best shown in FIG. 13C, the guides 134 protrude into the V-shaped grooves 138 formed in the bars 125, so that the push button 132 is supported so that it can slide along the stop bars 125, made integral by the projections 130 As shown in Figure 13 C, the underside of the push button 132 is

  digs and houses a U-shaped leaf spring 136 whose ends

  mites are in contact with the button 132 and whose base is in contact with the base 115 of the channel-shaped member 110 under the action of a bending force which pushes the push button 132 and thus the bars 125 apart of the organ

  channel-shaped, so that the body 133 of the button-

  pusher 132 is housed in the slot 118 formed between the flanges 117 of the channel and the stop bars 125 are at

flange contact 117.

  The flanges 117 of the channel-shaped member 110 are deformed at a point between their ends so that they form two ears 137 protruding downward

  as best shown in Figure 18.

  The end of the long connecting rod 112 is mounted on the member 110 in the form of a channel with the interposition of a spacer 138 shown in FIG. 16 The spacer 138 is a rectangular block having the same width as the slot 118, having a central hole 139 for housing a

  pivot for the long connecting rod 112 The sides of the

  height 138 has respective ribs 140.

  The spacer 138 is mounted towards the end of the channel-shaped member 110, as shown in FIG. 17 The ribs 140 protrude into the grooves of the channel-shaped member, for a purpose described in the

after.

  During use, the articulated support is mounted in a closure member as described above with reference to the drawings When the arm is in the fully closed position, it covers the member 110 in the form of a channel When the arm 111 moves towards an open position, the associated stop bars 125 move

  along the sides of the member 110, under the flanges 117.

  This opening movement continues until the ends of the bars 125 are in contact with the ears.

  137 At this time, no additional opening movement

  shut up of arm 111 is not possible This is the position

shown in Figure 11.

  If the push button 132 is pressed despite the force of the spring 136, the ends of the stop bars 125 leave their cooperation with the ears 137, towards the base 115 of the channel-shaped member 110 so that the bars 125 can pass under the ears 137 Thus, the opening movement of the arm 111 can continue until the arm 111 reaches the fully open position. This is shown in FIG. 12. Towards the end of its movement d 'opening, the grooves 128 in V of the stop bars 125 are in contact with the ribs 140 formed on the spacer 128 so that the stop bars 125 can pass beyond the spacer 128. As in the embodiment of Figures 8 to, two or more sets of ears may be present in order to

  that they delimit a number of different positions

limited opening annuities.

  It should obviously be noted that the push button 132

  is not necessarily formed separately from the bars 125.

  It can be integral with the bars 125 In addition, these stop bars 125 can be formed in one piece with the

rest of slide 119.

  Of course, various modifications can be made by those skilled in the art to the articulated supports which have just been described only by way of non-illustrative examples.

  limiting without departing from the scope of the invention.

Claims (13)

  1 articulated support intended to connect a closure member to an associated frame, of the type which comprises a channel-shaped member (10; 110) intended to be connected to one of the parts, an arm (18; 111) intended to be connected to the other of the parts, and a linkage (14, 15, 16, 17, 21; 112, 113, 114, 119) connecting the channel-shaped member to the arm so that it allows movement of opening and closing of the closing member towards   the chassis and outside of it, the linkage includes   nant at least a first connecting rod (15, 16; 113; 114) articulated on a slide (20; 119) housed so that it can slide in the channel-shaped member (10; 110) during the opening movement and closing, the articulated support being characterized in that an elongate stop member (24; 45; 120; 125) is arranged along the channel-shaped member between the slide (20; 119) and a stop member (23; 45; 123; 137) placed on the channel-shaped member (10; 110) so that it limits the opening movement of the slide, the elongated member   stop (24; 45; 120; 125) can be released manually   so that it allows an additional opening movement of the slide (20; 119).   2 articulated support according to claim 1, characterized in that the stop member (120; 125) is supported by the slide (20; 119), it is elongated and it is returned by a spring to a position in which the the stop member (120; 125) is in contact with a stop (123; 137) formed on the channel-shaped member (110), the stop member being movable despite the force of the spring so that the stopper is released.   3 articulated support according to claim 2, characterized in that the stop member comprises a spring strip (120) having its own flexibility so that it   forms the spring and intended to push the strip back into position   tion of cooperation with the stop, the spring band (120) being able to flex so that it allows the separation of the stop (123).   4 articulated support according to claim 3, characterized in that the channel-shaped member comprises a base (115), side walls (116) which project therefrom and flanges (117) projecting inwards from the side walls that they delimit between them an elongated slot, the slide (119) sliding in the channel-shaped member and passing through the slot so that it is connected to at least the first connecting rod (113, 114), the strip of spring (120) lying in a plane generally parallel to the base (115) but capable of bending upwards so that it is in contact with the internal surfaces of the flanges (117), the flanges having at least one stop (122 , 123) intended to be in contact with one end of the strip   spring (120) so that they limit the opening movement   ture, the spring strip (120) being flexible so that it separates from said stop at least (122, 123) and allows   said additional opening movement.   5 articulated support according to claim 2, characterized in that a spring (136) is placed between   the stop member and the channel-shaped member.   6 articulated support according to claim 5, characterized in that the stop member comprises a button placed at a first end remote from the slide, the spring (136) being placed between a button (132) and the member in the form of channel so that the depression of the button (132) separates the stop member from the stop (137) and allows the   additional opening movement.   7 articulated support according to claim 6, characterized in that the channel-shaped member comprises a base (119), side walls (116) which project therefrom and flanges (117) which project towards the inside of the side walls and delimit an elongated slot between them, the slide (119) having a body which slides in the channel-shaped member and passing through the slot so that at least the first connecting rod (113, 114) is   connected, the stop member comprising two parallel bars   ledges but distant (125) which protrude from the body along respective grooves each delimited by the base (115), a first side wall (116) and a flange (117) of the organ in the form of a channel, each bar of stop (125) being narrower than the associated groove and sliding along a path adjacent to the associated flange (117), the depression of the button (132) pushing the ends of the stop bars (125) away from the body outside the path to the base so that the ends of the stop bars are separated from the stopper and allow the   additional opening movement.   8 articulated support according to claim 7, characterized in that the stop bars (125) have respective elongated grooves facing towards each other, the button comprising parallel guides (128) which cooperate with the grooves so that the button (132) can present a sliding movement relative to the stop bars.   9 articulated support according to one of claims 7   and 8, characterized in that the stop comprises two ears (137) formed by pushing the respective flanges in order   that they protrude into the associated gorges.   Articulated support according to any one of   claims 5 to 9, characterized in that the spring is   a U-shaped spring (136) whose free ends cooperate with the button (132) and whose base is in contact with the   base (115) of the channel-shaped member.   11 Articulated friction support as claimed   tion 1, characterized in that the elongated stop member (24) is temporarily connected to the channel-shaped member (10) in the path of the slide (20) so that it is in contact with the slide and does not allow a movement limited arm opening.   12 Articulated friction support as claimed   tion 11, characterized in that the stop member comprises an elongated bar (24) temporarily fixed to the channel-shaped member (10) and disposed along this member parallel to the length of the shaped member channel, the movement of the slide (20) being limited by the   contact of the slide with one end of the bar (24).   13 Articulated friction support according to claim 1, in which the stop member comprises an elongated retaining bar (45) connected to the slide (20) so that it moves with it, the retaining bar (45 ) carrying a pawl (47) which, in the operating position,   cooperates with the channel-shaped member (10) by not allowing   as long as the arm has a limited opening movement, the pawl (47) being able to be separated so that it allows the   additional opening movement.   14 Articulated friction support as claimed   tion 13, characterized in that the pawl is a screw (47)   which, when in the retracted position, allows movement   maximum opening of the slide (20) but which, when in the advanced position, comes into contact with   the channel-shaped member (10) and only allows movement   ment of limited opening of the slide (20).