CS230791A3 - Inflatable and expulsion pad and a extensible jack being provided with said pad - Google Patents

Description

teaching and blowing pad and retractable jack provided with this pad.

TECHNICAL FIELD

Inflatable and blown cushions have numerous applications, particularly when lifting objects, or for pulling on connecting members to keep them biased during assembly or disassembly of a part of the device. ;

In particular, they are used for pressure belts used in industry, particularly nuclear, such as nuclear reactor vessels, chemical or oil vessels, whose lid is removably attached to the container to allow intermittent interventions on the container.

To this end, the lid is fastened to the container by connecting members, e.g. studs screwed into the threads of the holes formed i; in the top of the container and through the openings formed in the flange. f. lids coaxial with the creatures at the top of the container. i 's

Said studs are used in a large number and positioned relatively close to each other so that removal and re-insertion of the cap requires its engagement, screwing and unscrewing all these screws. i í. "and

In addition, during assembly and disassembly, a pulling device is applied to the bolt by pulling it to bring it into a prestressed state. £ i? sj:. - THE CHARACTERISTICS OF BACKGROUND OF THE ART. FR-A-2 440 251 discloses a hydraulic device for prestressing fasteners formed by screws.

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This device consists of inflatable membranes arranged above the top and positioned above the thrilling members. The membranes are placed in the container forming their packaging.

Also fr. pat. FR-A-2 400 999 discloses a tensioning device for bolts using a tight expanding member formed by a rubber layer rolled on a metal template.

The pressurized fluid expands the rubber layer to exert a tensile effect on the expanding member.

In addition, it is from French pat. FR-A-2 587 742 discloses an arrangement for tightening screws formed by a screw-in eye deformable by pressure fluid.

In general, inflatable and blown cushions, still used in particular in the fastening devices of the fasteners, are at least one hollow casing provided in a deflated condition, the inner inflatable chamber.

However, these known devices have a number of disadvantages.

The force exerted is limited by the resistance of the envelope, so that in order to obtain sufficient force it is necessary either to either expand the active part of the device, which is not always possible due to the environment and the usable place, or to place several cushions behind, which makes the assembly complex and also complex system for supplying pressurized fluid.

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the aforementioned drawbacks and the design of an inflatable and blow molding cushion whose use does not require special positioning means and allows use in a wide range of pressures. The object of the present invention has been achieved by the design of an inflatable and blow molded cushion such that it comprises a block of resilient material comprising an inner gap whose walls initially adhere to each other so as to form a solid block and further an inflatable channel with a fixed end opposite said joint and a second end joined source of pressure fluid. Furthermore, according to the invention, the block of resilient material is formed by two solid portions each of which has a planar surface facing the planar surface of the second portion, thereby providing a connecting plane such that the peripheral portions of the two planar surfaces are fixed to each other to form said inner gap. a pad of non-stick material is provided; a block of resiliently deformable material is cast into a mold; a block of resiliently deformable material has a lenticular shape; in an inflatable lead simultaneously with casting a block into a mold; is attached to the conical opening of said block; - the resiliently deformable material of said block is formed by an elastomer / or similar material; - the cushion has at least one rigid portion, an obstruction of material extrusion at the edges of its outer surfaces podusky. It is also an object of the present invention to provide a tensioning screwing device of a connecting member formed by a clamping member of a device portion having at its upper end a gripping member forming a body / bolt intended to engage a support projection of said device portion and provided with a clamping member support wherein the bolt is provided with means for exerting a tensile effect on the connecting member by means of said gripping member such that the means of exerting the tensile effect are formed by an inflatable padding as described above. According to further features of the invention: - the cushion has an annular shape of the lens cross section, - the cushion is placed in a support complementary to the half cross section of the cushion located at the lower end of said gripping member, - the cushion is placed in a complementary half cross-sectioned cushion provided on the top with a tubular portion extending said collar - the upper end of said tubular portion extending into an annular recess adapted to the lower portion of said gripping member somewhat larger than the radial dimension of the cushion - the collar has a conduit for maintaining the connection of the pressure fluid source to the inner joint of said cushion.

CLEARING THE DRAWING

The invention will now be described, by way of example, with reference to the accompanying drawings, in which:

1 is a front view of the first embodiment of the cushion in the deflated position;

Figure 2 is a cross-sectional view of a second embodiment of the cushion in the deflated position;

Fig. 3 is a cross-sectional view of a third embodiment of the cushion in the deflated position;

Fig. 4 is a schematic front view of a screw tensioning device of the coupling member; Fig. 6 is a partial cross-sectional view of a screw tensioning device with a cushion in an inflated state;

DESCRIPTION OF THE INVENTION

The inflatable and blowable cushion 1 shown in FIG. 1 in an inflated state has the form of a block of resiliently deformable material, e.g., an elastomer or the like. The material block has an inner gap and an inflatable channel 3 with a first end 3a disposed opposite the inner gap and a second end 3b connected to the liquid source (not shown). In the initial state, the walls of the inner joint 2 abut against each other such that in the deflated state they form an inflatable and blow molded. cushion 1_total block.

In fact, due to the elasticity of the material, this causes

the elasticity of shrinkage of the inner joint 2 so that in the initial deflated state of the joint 2 the inflatable and blowing cushion 1 disappears. As a result, the cushion of the invention does not contain any inflatable chamber prior to inflating.

For example, a block of resilient material can be obtained by casting into a mold, in which case the channel 2 can be formed by a cylindrical tube 4 cast at the same time into a mold with said block of resilient material.

According to a second embodiment of the invention shown in FIG. 2, an insert 5 of non-stick material is disposed in the inner gap 2. FIG.

The insert 2 has the same cross section and the shape of the inner gap 21 so that the walls of the joint 2 abut against the insert in the blown state to form a blowable and blowable cushion 2? while forming a full cross section of the block of its material.

According to another third embodiment of the invention shown in FIG. 3, the inflatable channel 2 is formed in the inflatable tube 6, which is connected to the conical hole formed in the material block of the inflatable and blown cushion.

According to yet another fourth embodiment of the invention shown in FIG. 4, the blowing and inflatable cushion 1 is formed of two-part parts 1A, 1b having a second part-plane surface 10a, 10b with respect to the opposite second surface, and thus determining the division plane P

The peripheral portions of the planar surfaces 10a, 10b are connected to each other by any suitable means so as to form an inner gap 2 between the portions 1 and 1 of the cover 2.

Also in this case, the walls of the inner joint 2 adhere to each other that in the deflated state, the inflatable and the blow cushion 2 is a full block without any inflatable chamber. In this way, an inner liner 2 can be provided with a liner 2. Further, an inflatable canal 2 can be formed in a tube cast simultaneously with part 1a or 1b or provided in a tube whose end is inserted into a tapered bore formed in the respective section 1a, 1b of the inflatable and blown pads 1.

The blow molding and inflatable cushion 11 of the resiliently deformable material has any shape and the cross-section, for example, of the lens on the periphery may be provided with at least one rigid portion, e.g., a metal triangular segment 9 fixed or anchored in the material of the inflatable and blow pad 1_ so as to obstruct the extrusion of the material by the pressure of the inflatable material. During inflation, the pressurized medium flows through channel 2 into the inner gap 2 so that its walls are separated and form an inflatable chamber.

The inflatable and blow cushion 2 of the present invention is actually a self-sealing container, indicating that the higher the pressure, the higher the tightness, so that the tightness problems are largely eliminated.

The use is convenient and does not require any additional means and measures for placement, which, on the one hand, facilitates assembly in the workshop, permits a substantial reduction in the duration of the procedure on site.

Otherwise, can the inflatable and blow cushion 2? as far as its construction is concerned, use it in a wide range of pressures which can reach the order of 3,000 bar.

FIGS. 5, 6 show a screw tensioning device provided with a blow and blow cushion 2 according to the present invention.

The tensioning screw device 20 allows tensioning of the coupling member formed, for example, by the stud bolt 30. The stud bolt 30 is intended to secure the lid 31 of the container 32, e.g.

For this purpose, the container 32 carries on the upper part a set of holes 22 provided with threads distributed evenly over its circumference and the main axis of said container 32 for receiving the ends of the studs. In addition, the lid 31 has a peripheral flange 31a provided with through holes 34 corresponding to the holes 33 with the threads of the container 32 , distributed symmetrically around the circumference of the pitch circle, the major axis of the lid 31.

A stud bolt 30 passes through each through hole 34.

At the upper end of the threaded stud 30, a gripping member is screwed, e.g. a nut 35, coming into contact with the upper surface of the peripheral flange 31a for fastening the lid 31 to the receptacle 32. the screw tensioning device 20 is formed by a sleeve 21 resting on the upper surface of the upper circumferential flange 31a of the lid 31, provided with a space 21a to allow the handle to be screwed in and unscrewed by, for example, a nut 35, by a suitable means (not shown) or inserted into the opening 35a of the nut 35. From the sleeve 21 a tubular portion 21b with a bearing surface 21c protrudes? formed at its upper end. The bearing surface 21c is intended for receiving an inflatable and blowing cushion 1, and for this purpose a half-cut half-cut shape of said cushion 1. j

The inflatable and blow cushion 7 is also located in the housing; 25a in the shape of a complementary cross-section of the cushion 7 provided at the top; by a gripping member, e.g., a nut 25 screwed onto the upper end of the threaded stud bolt 30.

In order to guide the nut 25, the tubular portion 21b of the sleeve 21 penetrates into an annular extension secured to the lower portion of the nut 25 by a somewhat larger diameter than the inflatable and blow molding pad 11, allowing it to be stuck without jamming or jamming. !

The sleeve 21 is provided with a tube 22 into which both the inflatable tube and the cushion 1 penetrate and connects the source of pressurized medium (not shown) and the inner gap of the said cushion 1. !

The inflatable and blow molding cushion 1 has an annular lens cross section allowing the stress on the parts in contact with each other to be reduced. In the case where an insert 5 is placed in the inner joint 2, the insert 5 has the shape of an annular washer. g;

The space occupied by the inflatable and blowing cushion 1 does not interfere with the diameter of the gripping member e.g. the nut 35. Even at the time of inflation, the pressurized medium flows through the tube 22 and through the inflow channel 3 to the level of the inner joint 2 provided in the cushion 1, which causes the walls of the inner joint 2 to be delayed (FIG. 6).

In doing so, the inflating cushion 7 is applied to the stud 30 by means of nut 25tah.

The segments 9 prevent the material of the cushion block 1 from being pushed out by the influence of the internal inflation pressure.

The bolt tension 30 thus obtained during assembly or de-assembly can be monitored by screwing or unscrewing nut 35.

The screw-type tensioner 20 of the present invention consists of a minimum number of members and also requires no special measures to be applied to the stud bolt 30. The screw tensioning device 20 can be used in all industries for prestressing the respective members and can be adapted to dimensions and all kinds of threads. i

Claims (9)

FfRW '' - - 2.3 07 Patent claims Inflatable and blow molding cushion, characterized in that it is formed on a block of resilient material containing an inner joint (2) whose walls are initially in contact with the formation of a full cross section of said block and has an inflated a passageway (3) whose first end (3a) faces the inner space (2) and its other end (3b) is connected to a source of pressure medium. 2. Inflatable and blowing cushion according to claim 1, characterized in that the block of resilient material is formed of two portions (1a, 1b) each having a planar surface (10a) corresponding to a planar surface (10b) of the second portion. the vines (10a, 10b) define the contact plane of the two portions (1a, 1b), the peripheral portions of the planar surfaces (10a, 10b) being connected to form an inner gap (2) of the block portions (1a, 1b). An inflatable and blowing cushion according to claims 1 and 2, characterized in that an insert (5) of non-adhering material is arranged in the inner gap (2). An inflatable and blow molding pad according to claims 1 and 2, characterized in that the block of resiliently deformable cushion material (1) is molded into a mold. The inflatable and cushion cushions of claims 1 and 2, wherein the cushion resilient material block (1) is a shallow diameter. Inflatable and blowing cushion according to claim 1, characterized in that the channel (3) is formed in an inflatable tube (4) cast with a block of inflatable and blown cushion (1). An inflatable and blowing cushion according to claim 1, characterized in that the channel (3) is formed in an inflatable tube (6) whose one end is inserted into a conical hole (7) formed in the inflatable cushion pad block (1). 7 An inflatable and blowing cushion according to any one of the preceding claims, characterized in that the resiliently deformable material of the inflatable cushion block (1) is an elastomer or the like. An inflatable and blowing cushion according to any one of Claims 1 to 8, characterized in that at least one segment (9) is provided on the outer peripheral surfaces as an obstacle to extruding the material of the inflatable and blowing cushion (1). A screw tensioning device of a coupling member formed by a gripping member, e.g. a nut provided on one part, having a gripping member at the upper end, e.g. a nut, forming a body of a screw tensioning device intended to contact the sleeve in contact with said portion and having space for a gripping member, e.g. a nut, which device has tensile effect on the coupling member by means of said nut, characterized in that the tensile effect means comprises an inflatable cushion (1) according to any one of the preceding claims. Tensioning device according to Claim 10, characterized in that the cushion (1) has the shape of a thin, lenticular cross section. Tensioning device according to claims 10 and 11, characterized in that the blowing and blowing cushion (1) is located in a housing (25a) of a complementary half-cross-sectional shape of the cushion (1) provided at the bottom of the nut (25). Tensioning device according to claim 10, 11, characterized in that the plunger (1) consists of a support (21c) of a complementary cross-sectional shape of the cushion (1) provided at the upper end of the tubular portion (21b) extending from the sleeve ( 21). Tensioning device according to any one of claims 10 - 13, characterized in that the upper end of the protruding tubular portion (21b) protrudes into an annular recess (25b) provided in the lower portion of the gripping member, e.g. somewhat larger than the radial space occupied by the cushion (1 (. A tensioning device according to any one of claims 9 - 14, characterized by 11 gk ^ 3 -? * ~,, "·", "Ί" ί ^ ^'β'ο '' »* τ, -Λ ί - * i. Characterized in that the sleeve (21) is provided with a tube (22) for connecting the source of pressure medium and the internal joint (2) of the inflating and blowing cushion ( 1). YOU DONATE FRAMATOME 'zast.