FR2682407A1 - LOOK FOR PUSH OR SIMILAR. - Google Patents

Abstract

The present invention relates to a manhole for a roadway or other structure. This manhole comprises a frame (1) and a buffer (2) each comprising three support zones (Z1, Z2, Z3, Z'1, Z'2, Z'3) arranged substantially at 120degree from one of the other and forming the vertices of an equilateral triangle, one (Z1, Z'1) of the three support zones consisting only of a surface (5, 5a) forming a helical ramp, while each of the other zones d 'support comprises a helical ramp (6, 7, 6a, 7a) and an associated counter-stop (8, 9, 8a, 9a) located on the side of the bearing zone (Z1, Z'1) forming a single helical ramp , the two counter-stops (8a, 9a, and 8, 9) of the buffer (2) and of the frame (1) comprising active faces inclined in opposite directions (10, 11, 10a, 11a). Such a manhole can be mounted on a road or a sidewalk for example and can be opened without particular difficulties while having excellent stability to the passage of heavy loads.

Description

The present invention essentially relates to

  a look for pavement, sidewalk or other work.

  We have known for a long time already looks including, in general, a circular frame that can be incorporated in the floor and is closable

  by a cover or buffer also circular.

  It is also known to provide the frame and the buffer with three cooperating zones or support surfaces arranged substantially at 1200 from one another, that is to say constituting the three vertices of an equilateral triangle. These three bearing zones can be arranged on the frame and on the pad in such a way that they each constitute a helical ramp to which counter-stops can be associated. Thus, the positioning of the pad on the frame is carried out in the manner of a screwing until the counter-stops on the pad come into blocking contact with the

counter-butts on the frame.

  But such an arrangement is not without presenting a

number of disadvantages.

  Indeed, although the buffer has a relatively good stability once mounted on the frame, it is very difficult to extract it from the frame to open the eyes This is due to the fact that jamming jamming of the buffer in the frame requires operator to perform first a buffer release action, then an unscrewing action of this buffer, which is particularly restrictive and painful because of

important efforts to provide.

  The above disadvantages arise from the fact that the three bearing zones, both on the pad and on the frame, and each consisting of a helical ramp and an associated counter-stop, are conjugated, so that mounting the buffer on the frame, these support zones are embedded and are wedged into each other after mounting or screwing the buffer in the frame, which assembly also provides a significant vertical depression of the buffer in the frame. The object of the present invention is to overcome the above drawbacks by proposing a look with a pad and frame which not only remains perfectly stable during a force exerted on the surface of the pad at any point, but which does not pose any problem. nor any difficulty in extracting the buffer from the frame, thanks to a special organization and configuration of the three zones of support on the

stamp and on the frame.

  For this purpose, the subject of the invention is a manhole or the like of the type comprising a circular frame which can be incorporated in the roadway and can be closed by a lid or buffer which is also circular, the frame and the buffer being each provided with three zones of support disposed substantially at 1200 from each other, these three support zones constituting a helical ramp to which counter-stops can be associated, characterized in that one of the three bearing zones is constituted solely by of a helical ramp, while each of the two other bearing zones comprises an associated helical ramp and counter-stop situated on the side of the support zone forming a single helical ramp, the two counter-stops having inclined active faces

in the opposite way.

  According to another characteristic of this view, the line of intersection of the two planes respectively constituting the two active faces inclined in opposite directions of the two aforementioned abutments is substantially perpendicular to the mediator of the triangle formed by the three bearing zones and therefore of the support area forming

single helical ramp.

  We will specify here again that the aforementioned line

goes through the center of the gaze.

  According to yet another characteristic of this invention, the buffer and the frame comprise a relative positioning mark constituted for example by a lug and a notch cooperating with this lug, said lug and said notch being preferably located at the level of the

  support zone forming a single helical ramp.

  But other features and benefits of

  the invention will appear better in the description

  Detailed description which follows and refers to the accompanying drawings, given by way of example, and in which Figure 1 is a perspective view of the frame and buffer before mounting and forming the view according to this invention; Figure 2 is a plan view and from above the gaze, the pad being mounted in its frame; Figure 3 is a sectional view along the line III-III of Figure 2; Figures 4, 5, 6 and 7 are sectional views respectively along lines IV-IV, V-V, VI-VI, and VII-VII of Figure 2; and FIG. 8 is a partial view in plan view, similar to FIG. 1, but showing an exemplary embodiment of a tracking system to facilitate the

mounting the stamp in its frame.

  Referring in particular to Figures 1 to 7, we see a look constituted, as is well known in itself, a circular frame 1 to be sealed in the floor for example and can be closed by a removable pad 2. The frame 1 comprises a sole 3 in the form of a circular ring and which comprises lights, holes or the like (not shown) for sealing the frame by means of bolts for example, or which comprises sealing tabs (not shown) to improve the connection of the frame 1 to the edge of the hole in the roadway or other structure for

receive said frame.

  The ring 3 is surmounted by a cylindrical envelope 4 disposed concentrically and perpendicularly to the ring gear 3, being connected to

  this one by reinforcing gussets 3 has for example.

  Inside the envelope 4 are provided three zones or bearing surfaces Z 1, Z 2 and Z 3 disposed substantially at 1200 from one another and forming the three vertices of an equilateral triangle T, as we see it well

in Figure 2.

  These three bearing zones each comprise and respectively a surface 5, 6, 7 forming a helical ramp. The buffer 2 bears on its underside three bearing zones Z'1, Z'2, Z'3, which are also arranged at 1200 from each other and forming the three vertices of the equilateral triangle T These three zones of each support respectively comprise a surface 5a, 6a, 7a in the form of a downward helical ramp. Thus, when the buffer 2 is put in place on the frame 1, the ramps 5a, 6a and 2a of the buffer 2 will respectively cooperate. with the ramps 5, 6 and 7 downwardly of the frame 1, and that with rotation, in the manner of a screwing, the buffer 2 in the

framework 1.

  According to the invention, the support zones Z 1 and Z'1 of the frame and the buffer respectively consist solely of a helical ramp 5, 5 a,

  as it clearly appears in Figure 1.

  As for the support zones Z 2, Z 3 of the circular frame 1, and Z'2, Z'3 of the buffer 2, they each comprise a support surface forming a helical ramp 6, 7 and 6 a, 7 a, to which is associated a counter-stop whose situation and orientation on the frame 1 and on the buffer 2 are particular, as will be explained below. The frame 1 comprises two counter-stops, namely a counter-stop 8 associated with the helical ramp 6, and a counter-stop 9 associated with the helical ramp 7, these two abutments having active faces respectively 10, 11 which are inclined in opposite directions,

  as can be seen in Figure 1.

  In the same way, the buffer 2 comprises two counter-stops, and namely a counter-stop 8a associated with the helical ramp 6a and a counter-stop 9a associated with the helical ramp 7a, these two counter-stops respectively having active faces l Oa, lia which are inclined in opposite directions, as is still seen of course on

Figure 1 in particular.

  It is important to observe here that the abutments 8, 9 on the frame 1 are located respectively on the side of the bearing zone Zi, that is to say between the zone Z 1 and the helical ramp 6 for the counter-stop 8, and between the support zone Z 1 and the helical ramp 7 for the counter-stop 9 It is the same for the corresponding counter-stops 8a and 9a of the buffer 2 which are both located side of the zone of support Z'l that is to say between this zone and the helical ramps

6a and 7a.

  We are thus here in the presence of an asymmetrical circumferential arrangement of the helical ramps and against-stops on both the frame 1 and the buffer 2, which provides great advantages, especially to the opening of the gaze, unlike the systems. prior art using a symmetrical circumferential arrangement of cooperating bearing surfaces, as will be described in detail later in

About the operation.

  It will be further specified here that, according to the invention, the line YY 'embodying the intersection of the two planes respectively constituting the two active faces inclined in the opposite direction 10, 11 (frame 1), and 10 a, 11a (buffer 2) of counter-stops 8-9, and 8a-9a, is perpendicular to the mediator M (FIG. 2) of the equilateral imaginary triangle T, starting from the bearing zone Z 1, Z'1 formed by a single helical ramp 5 The angle of 900 formed by the line YY 'with the mediator M is indicated by Fig. 2. It should be added that, according to the invention, the

  Y-Y 'right goes through the center O of the gaze.

  It should also be noted that the angle of the inclined active faces 10, 11 with respect to the ring 3 of the frame 1, and the angle of the inclined active faces 10a, 11a.

  relative to the plane of the buffer 2 may be close to 250.

  In this connection, the slope of the helical ramps 5, 6, 7 of the frame 1 and the corresponding slope of the ramps 5a, 6a, 1a of the buffer 2 will be defined as a function of the weight of the buffer, so that under the effect of its own weight, the buffer can develop sufficient efforts to ensure the contact of the active faces 1 Oa,

  against the corresponding ones 10 and 11 of the frame 1.

  To facilitate the mounting of the buffer 2 on the frame 1, and as can be seen in Figure 8, there is provided on the pad 2 a pin or the like 12 capable of cooperating with a notch or the like 13 formed in the frame 1 L ' 12 and the notch 13 constitute a positioning mark of the buffer 2 on the frame 1, this mark is preferably located at the support zone Z 1 Z'1 consists of a single helical ramp 5, 5 a on the frame and the buffer Of course, one could perfectly without departing from the scope of the invention adopt as a positioning mark a system other than that shown. For a better understanding of the invention, however, the operation and

  benefits of the look that has just been described.

  When placing the buffer 2 on the frame 1, the ramps 5a, 6a, 7a are contacted with the corresponding ones 5, 6, 7 of the frame 1 Each pair of cooperating O-ramps develops a tangential force proportional to the weight of the buffer The conjugation of the forces on the three pairs of cooperating ramps induces a rotation of the buffer 2 in the frame 1, and this in the clockwise direction This has the effect of applying the active faces 10a , 11a counter-stops 8a, 9a buffer 2 respectively against the active faces 10, 11 of the

counterbeats 8, 9 of the frame 1.

  Thus, a good stability of the buffer 2 in the frame 1 is ensured, and this for any load passing inside the triangle of levitation whose vertices are constituted by the bearing zones Z 1 - Z '1' Z 2 Z'2 and Z 3Zi 3 '', 2 '

3-

  If a rolling load passes over the zone marked F in FIG. 2, this load will give the buffer a lifting torque around the axis XX 'whose ends are constituted by the ramps in contact 6, 6a on the one hand and 7, 7 on the other hand But, due to the inclination of the cooperating active faces l Oa-10 and lia-11, any lifting of the buffer 2 will be prohibited, and more, an additional tightening will be imparted to the inclined faces 10a, 11a of buffer 2 against those 10 and

11 of the box 1.

  If the rolling load passes over one or other of the zones of the buffer 2 marked G 1 and G 2 in FIG. 2, said load will then impart to the buffer a lifting torque which will be thwarted either by the cooperation of the inclined active faces 1 Oa, 10 (for a force applied at G 2), or by the cooperation of the inclined active faces 11a and 11 (for a force applied at G 1), said faces being diametrically opposite, as has been

explained previously.

  But it is important to add here that not only an excellent stability of the buffer 2 on the frame 1 will be assured regardless of the location of the application of the load on said buffer, but the opening of the eye by extraction of the buffer of the frame will also be greatly facilitated due to the particular and asymmetrical circumferential arrangement of the helical ramps and counterbands on the frame

and on the stamp.

  Indeed, to open the eyes, it will be sufficient to lift the buffer without exerting a prior release action, since, during the uprising, the counterbeats 8a, 9a of the buffer 2 will escape naturally so to the corresponding counterbeats and alternate 8 and 9 of the frame, and this under the effect of a very slight rotation of the buffer relative to the frame, which will occur naturally during the uprising and which nothing can oppose, contrary to what was the case in previously known looks where the buffer was necessarily blocked in the frame and by

  therefore difficult to separate from said frame.

  A look has thus been produced according to the invention, which has excellent stability to rolling loads in particular and can be opened easily and without

special efforts.

  Of course, the invention is not limited to the embodiment described and illustrated which has not been

given as an example.

  Thus, the angle of inclination of the abutments can be variable, as well as the means for locating the positioning of the buffer on the frame can be arbitrary It is also possible to provide between frame and buffer a means facilitating the

  centering of the pad, as shown at 14 in Figure 6.

  This means that the invention includes all the technical equivalents of the means described and their combinations if they are carried out according to its spirit.

Claims (4)

R E V E N D I C A T I ONS   1 view for roadway or the like of the type comprising a circular frame (1) which can be incorporated in the roadway and closable by a cover or pad (2) also circular, the frame and the buffer being each provided with three support zones (Z 1, ZZ'1 Z 'Z 2 Z 3, Z'3) disposed substantially at 1200 from each other, these three support zones constituting a helical ramp to which counter-stops can be associated, characterized in that one (Z 1, Z'1) of the three bearing zones is constituted by only one helical ramp (5, 5 a), while each of the other two bearing zones (Z 2, Z'2, Z3, Z'3) comprises a helical ramp (6, 6a, 7, 7a) and an associated counter-stop (8, 9, 8a, 9a) situated on the side of the zone d support (Z, Z ') forming a single helical ramp, the two counter-stops comprising active faces   inclined in opposite directions (10-11, 10a-11a).   2 view according to claim 1, characterized in that the line (Y-Y ') of intersection of the two planes respectively constituting the two active faces inclined in opposite directions (10-11, 10 a-11a) of the two abutments mentioned above is substantially perpendicular to the mediator (M) of the triangle (T) formed by the three bearing zones and starting from the bearing zone (Z 1, Z'i 1)   single helical ramp (5, 5 a).   3 view according to claim 2, characterized in that the aforementioned line (Y-Y ') passes through the center (0) said gaze.   4 eye according to one of claims 1 to 3,   characterized in that the buffer (2) and the frame (1) comprise a relative positioning mark constituted for example by a lug (12) and a notch (13) cooperating with this lug, said lug and said notch being located from preference at the level of the support zone   (Z 1, Z ') forming a single helical ramp (5, 5 a).