FR2780997A1 - Floating pad for use in water based environment - Google Patents

Abstract

The pad (9) comprises of a circular upper surface. The surface is flat. A number of hollow chambers are situated beneath the surface of the pad. The pad has abutments that allow it to be linked to other such pads.

Description

-1 - The manholes, arranged under the roadway, present a frame

  sealed under roadway, covered with a cover or pad. In order to avoid nuisance by noise, the buffers are generally secured to the frames by various means; slopes and counter-slopes, hinges and latches, with or without combinations of joints. The present invention describes a manhole cover, on which the buffer

  rests on its frame by means of elastic means such as rubber

  cabbage, elastomer, ... etc. noise isolators, and capable of sealing

between frame and buffer.

  Other characteristics and advantages of the invention will appear better

  in the detailed description below and which refers to the accompanying drawings in

which:

  - Figure I shows a top view of the gaze.

  - Figure II represents the manhole in section along the axis AA of Figure I. - Figure III represents a partial section BB in the axis of the lock of Figure I. - Figure IV represents a partial section CC on the right of one of the contact pads in Figure I. Referring to the accompanying drawings, it appears that the frame (1) sealed under the road has a perforated sole (2) to promote the sealing in the

  pavement. A chimney (3) is arranged perpendicular to the sole (2).

  Significantly at the top of the chimney (3) and attached to this last, a support crown (4) develops which carries on its inner periphery a groove

  (5) serving as a recess for the seal (6) made of elastic material.

  With the chimney (3), the support crown (4) forms at least 3 protrusions

  sances (7) at the centers of which are located the support pads (8) made of elastic material. These studs (8) are located towards the outside of the frame (1) so as to increase

the seat of the buffer (9).

  Between 2 of the at least 3 support points is placed an imprint (10)

crossed by an axis (11).

  A pad (9) covers the frame (1) by substantially matching the profile of the chimney (3). This pad (9) has an outer support ring (12) formed by a single plane, and at its central part a rib (13) ensuring the resistance of the article; it rests on the frame (1) by means of the seal (6) and presents with the at least 3 studs (8) a functional play OX "the importance of which is in adequacy with the respective hardnesses of the elastic elements (6) and (8), so that when the rolling load passes, the seal (6) does not undergo excessive overload; the load difference being taken up by the at least 3 studs (8) -2- depending on the position of the rolling load.

  perfect reach between the pad (9) and the seal (6), the latter has on its bearing face a number of grooves (14) which each act as small independent springs so that under the weight of the pad (9 ), sealing5 with the frame (1) is ensured. The pad (9) is completed by a fork (15) which engages in the imprint (10) of the frame (1).

  The fork (15) has a profile which partially encircles and without any contact the axis (11) of the frame (1) when the pad (9) rests on its frame (1) in the closed position. The clearances "Y" between the axis (11) and the fork (15) are also

  accorded with the respective hardnesses of the elastic elements (6) and (8).

  Diametrically opposite this fork (15) is located a safety lock (16) which has a pallet (17) which engages, in the closed position, inside a fork (18) formed in the buffer (9 ). Between the pallet (17) and the fork (18) exist the same clearances "Y" tuned with the respective hardnesses

  elastic elements (6) and (8).

  The lock (16) is in the form of a cylinder arranged vertically in a cylindrical opening (19) of the frame (1).

  The contact faces are formed by planes (20) and (21) sequential to each other and perpendicular to the axis of the cylinder.

  To open or close the lock (16), just print a movement on it

of rotation.

  The manhole cover according to the invention comprises a buffer (9) which rests on its frame (1) by elastic means (6) and (8) with differential crushing. These means consist of a circular joint (6) and of, at least 3 load take-up studs (8) so that in the closed position, without load, the pad (9) rests only on the circular joint (6 ) and presents with the frame (1) a game

  "X" operating with elastic pads (8).

  When the rolling load passes, the seal (6) will partially support the load. Beyond the overwrite value "X"; that is to say the clearance between buffer (9) and elastic studs (8), the studs (8) will be shared with the seal (6) the entire load. For maximum life; the seal (6) must have a minimum hardness; moreover, to take over the entire load, it should be hard. It is the same for the studs (8). It is therefore necessary to choose judiciously the respective hardnesses of the elastic elements and to grant the difference in hardness between the seal (6) and the studs (8) so that the seal (6) does not

  receives only a limited load, the complement being taken up by the studs (8).

-3-

  The calculations and tests carried out show that the most judicious compromise is for differences between 10 and 40 shores.

  To ensure the watertightness of the manhole, the seal (6) has circular grooves (14) on its contact surface which each act as small springs, crushing under the weight of the pad (9). The manhole has a fork (15) and a lock (16) which cooperate with the axis (11) and the fork (18) to provide a set of value 'Y "between buffer (9) and

  frame (1) so as not to interfere with the work of the elastic means (6) and (8) and authorize a limited lifting of the buffer (9) in the event of accidental loading of the sewers. To be active, this security must be accompanied by the closing of the swivel lock (16).

  To do this, this last, in case of forgetting in the open position, presents itself with an offset of the sequent planes (20) and (21) so that the plane (20) of the

  frame (1) has a ramp on which the plane (21) of the latch (16) slides by pivoting by gravity under the action of vibrations when vehicles pass to place themselves in the closed position.

-4-

Claims (8)

  1) Manhole cover comprising a frame (1) sealed under the floor on which a pad (9) rests, characterized in that the latter rests on its frame (1) by elastic means with differential crushing. 2) Manhole according to claim 1 characterized in that the elastic means consist of a circular joint (6) and at least 3 load transfer pads (8).   3) Manhole according to claims 1 and 2 characterized in that the buffer (9) in the closed position, without load, rests only on the joint   circular (6) and that it has an operating clearance "X" with the elastic pads (8).   4) Manhole according to claims 1 to 3 characterized in that the difference in hardness between the seal (6) and the studs (8) is granted so that the seal (6)   receives only a limited charge; the complement due to the rolling load being supported by the studs (8) .15 5) Manhole according to claims 1 to 4 characterized in that the difference in hardness between the seal (6) and the studs (8) is between 10 and 40 Shores.   6) Manhole according to claims 1 to 5 characterized in that the seal   (6) has circular ridges on its contact surface (14) ensuring watertightness of the gaze.   7) Manhole according to claim 1, having a fork (15) and a latch (16) which cooperate respectively with the axis (11) and the fork (18), characterized in that they provide a clearance "Y" between buffer (9) and frame (1) allowing limited lifting of the buffer (9) in the event of loading sewer accidental.   8) Manhole according to claim 1 characterized in that the security lock (16) is pivotable, and that it is in the open position with an offset of the sequent planes (20) and (21) so that the plane ( 20) of the frame (1) has a ramp on which the plane (21) of the latch (16) slides by gravity under the action of vibrations when vehicles pass to get into position locked.