Screw-nut assembly installation tool

Abstract

Tool for installing a screw-nut assembly The invention relates to a tool (10) for installing a screw-nut assembly (14), the screw (16) comprising a first axial imprint (24); and the nut (17) comprising a driving surface (30). The installation tool comprises: - a tubular body (41) comprising a second axial imprint (64) capable of assembling with the driving surface (30) of the nut; - a rod (42) extending in the tubular body and comprising a head (80) capable of assembling with the first axial imprint (24) of the screw; and - a device (44) for locking the rod in the tubular body. In a locked position, the tool allows simultaneous rotational driving of the screw (16), by the rod (42) engaged with the first axial imprint (24), and of the nut (17), by the tubular body (41) engaged with the driving surface (30). Figure for abstract: Figure 6

Description

Title of the invention: Tool for installing a screw-nut assembly

[0001] The present invention relates to a tool for installing a screw-nut assembly, the screw-nut assembly comprising: a screw extending along a first axis, one end of said screw comprising a first axial recess, configured according to a first anti-rotation shape; the screw comprising a thread proximate said end; and a nut disposed proximate said end of the screw, engaging with said thread, the nut comprising a drive surface configured according to a second anti-rotation shape.

[0002] It is known to seek to limit the loosening of a nut in a screw-nut assembly assembling a set of elements. For this purpose, positive locking devices can be implemented, as described for example in document FR3067768 in the name of the Applicant.

[0003] It may be advantageous to rotate a screw-nut assembly after a specific adjustment on a frame for example, for the purpose of installation in a set of elements, without modifying a prior positioning of said screw-nut assembly. For example, if the screw has the shape of a threaded rod, the nut assembled to the screw can act as an enlarged head when installing said screw on a support and the position of the nut on the screw must be maintained.

[0004] The object of the present invention is to propose a tool for installing a screw-nut assembly making it possible to rotate both the screw and the nut, without modifying their relative positions.

[0005] To this end, the invention relates to a tool for installing a screw-nut assembly of the aforementioned type, comprising: a tubular body extending along a second axis, a first open end of the tubular body comprising a second axial imprint capable of being assembled to the driving surface of the nut; a rod extending in the tubular body along the second axis, a first end of the rod comprising a head capable of being assembled to the first axial imprint of the screw; and a device for locking the rod in rotation in the tubular body; so as to allow, in a so-called locked position of the tool, simultaneous rotational driving of the screw, by the head of the rod in engagement with the first axial imprint of said screw; and of the nut, by the second axial imprint of the tubular body in engagement with the driving surface of said nut;and so as to allow, in a so-called unlocked position of the tool, a relative rotation of the rod and the tubular body capable of aligning the second axial imprint with the driving surface of the nut, or capable of aligning the head of the rod with the axial imprint of the screw. ;

[0006] According to other advantageous aspects of the invention, the installation tool comprises one or more of the following characteristics, taken individually or in all technically possible combinations:

[0007] - the tubular body comprises an internal radial surface configured according to a third anti-rotation form; the rod comprises a cylindrical portion of non-circular section; and the locking device comprises a corolla, arranged along the second axis in the tubular body, said corolla comprising: an external radial surface, capable of assembling with the internal radial surface of the tubular body, so as to block the corolla in rotation relative to said tubular body; and a cylindrical internal surface, capable of sliding axially along the cylindrical portion of the rod;

[0008] - the external radial surface of the corolla is capable of being assembled to the radial surface internal of the tubular body according to a plurality of angular positions, arranged according to an angular period;

[0009] - the tubular body comprises at least one first lateral slot, extending parallel to the second axis between two closed ends; and the locking device further comprises a ring, fixed to the corolla and capable of moving axially in the at least one first slot so as to drive said corolla in translation;

[0010] - the at least one first lateral slot has, in a plane extending perpendicular to the second axis, a length of arc of a circle of angle a, the angle a being substantially equal to twice the angular period of the corolla;

[0011] - the installation tool further comprises at least one pin disposed in the ring and successively passing through one of said first lateral slots and a radial drilling of the corolla;

[0012] - the installation tool comprises at least one marking on an outer surface of the tubular body, the ring covering or uncovering one of the markings depending on the locked or unlocked position of the installation tool;

[0013] - the installation tool comprises a first elastic return element, tending to axially moving the rod towards the first end of the tubular body;

[0014] - the installation tool comprises a second elastic return element tending to axially move the corolla towards the first end of the stem.

[0015] The invention further relates to an installation assembly, comprising: a screw-nut assembly, said screw-nut assembly comprising: a screw extending along a first axis, one end of said screw comprising a first axial recess, configured according to a first anti-rotation shape; the screw comprising a thread proximate said end; and a nut disposed proximate said end of the screw, engaging said thread, the nut comprising a drive surface configured according to a second anti-rotation shape; and an installation tool such as described above, the second axial imprint being adapted to be assembled with the driving surface of the nut and the head of the rod being adapted to be assembled with the first axial imprint of the screw.

[0016] The invention further relates to a method of implementing an installation assembly as described above, comprising the following steps: providing the installation tool in the locked position; engaging one of the driving surface of the nut with the second axial imprint of the tubular body; and the head of the rod with the first axial imprint of the screw; then actuating the locking device of the installation tool, so as to unlock the tool, and rotating the rod relative to the tubular body; engaging the other of the head of the rod with the first axial imprint of the screw and the driving surface of the nut with the second axial imprint of the tubular body; actuating the locking device of the installation tool, so as to lock the tool and prohibit rotation of the rod relative to the tubular body;then rotating the installation tool, so as to simultaneously rotate the screw and the nut of the screw-nut assembly. ;

[0017] The invention will be better understood on reading the description which follows, given solely by way of non-limiting example and made with reference to the drawings in which:

[0018] [Fig-1] [Fig.l] is an exploded perspective view of an installation tool according to an embodiment of the invention;

[0019] [Fig.2] [Fig.3] Figures 2 and 3 are cross-sectional views of the installation tool of [Fig.l];

[0020] [Fig.4] [Fig.4] is a longitudinal sectional view of an element of the installation tool of Figures 1 to 3;

[0021] [Fig.5] [Fig.5] is a perspective view of other elements of the installation tool of Figures 1 to 3; and

[0022] [Fig.6] [Fig.6] is a longitudinal sectional view of an installation assembly according to one embodiment of the invention, comprising the installation tool of Figures 1 to 3.

[0023] Figures 1, 2, 3 and 6 show an installation tool 10 according to one embodiment of the invention.

[0024] The tool 10 is in particular intended for the installation of a screw-nut assembly. In particular, [Fig. 6] shows an installation assembly 12 according to one embodiment of the invention, comprising: a screw-nut assembly 14; and the tool 10, suitable for the installation of said screw-nut assembly 14.

[0025] The screw-nut assembly 14 comprises a screw 16 and a nut 17. In the embodiment shown, the screw-nut assembly 14 further comprises a washer 18.

[0026] The screw 16 extends along a first axis 20. A first axial end 22 of said screw forms a flat surface, perpendicular to said first axis 20. Said first end 22 comprises a first axial imprint 24, configured according to a first anti-rotation shape. Preferably, as specified below, the first axial imprint 24 comprises flats or sides.

[0027] The screw comprises a thread 26 near the first end 22.

[0028] Preferably, the screw 16 has a second end (not shown) capable of being installed on a support (not shown) by rotation of said screw. For example, the screw 16 is devoid of an enlarged head at its second end and is in the form of a threaded rod or a stud.

[0029] The nut 17 comprises: a thread 28, capable of cooperating with the thread 26 of the screw 16; and a drive surface 30.

[0030] In the embodiment shown, the nut 17 further comprises a base 32, widened relative to the drive surface 30. More precisely, in the embodiment shown, the washer 18 is intended to be installed in axial contact with the widened base 32 of the nut 17.

[0031] The drive surface 30 is a radial surface configured according to a second anti-rotation shape. Preferably, as specified below, the drive surface 30 comprises flats or sections.

[0032] In [Fig. 6], the screw-nut assembly 14 is in a so-called installation configuration. In said installation configuration, the nut 17 is mounted on the screw 16, the tapping 28 cooperating with the thread 26. The enlarged base 32 of the nut is oriented opposite the first end 22 of the screw.

[0033] More precisely, in the installation configuration, an axial end 34 of the nut 17, opposite the base 32, is arranged at an axial distance 36 from the first end 22 of the screw 16.

[0034] The installation tool 10 is intended to rotate the screw-nut assembly 14, by locking the nut 17 in rotation relative to the screw 16 so as not to modify said axial distance 36.

[0035] The installation tool 10 extends along a second axis 40 and comprises: a tubular body 41; a rod 42; and a device 44 for locking the rod 42 in rotation in the tubular body 4L.

[0036] In the embodiment shown, the installation tool 10 further comprises: a first 46 and a second 48 elastic return element; and a cover 52.

[0037] The tubular body 41, shown alone in [Fig.4], extends along the second axis 40 between a first 54 and a second 55 open end.

[0038] In the embodiment shown, an external surface of the tubular body 41 comprises a first 50 and a second 51 marking. As will be detailed by Subsequently, the first 50 and second 51 markings are intended to indicate that the locking device 44 is in the unlocked position and the locked position, respectively. In the embodiment shown, the first marking 50 is an engraving disposed near the first open end 54, and the second marking is an engraving disposed near the second open end 55. For example, the first 50 and second 51 markings indicate the terms "NOT OK" and "OK" respectively.

[0039] The markings 50, 51 are optional: the tubular body may not include any visual means of position, only one of them or both. Other visual means than engravings may be used, such as the affixing of a band or colored signs.

[0040] An internal surface of the tubular body, visible in [Fig.4], comprises a first, a second 56, a third 57 and a fourth 58 portions, aligned along the second axis 40 between the first 54 and the second 55 ends.

[0041] Furthermore, the internal surface of the tubular body comprises a first shoulder 60, oriented towards the first end 54, and a second shoulder 62, oriented towards the second end 55. The first 60 and second 62 shoulders axially delimit the second portion 56, which has a radial dimension smaller than those of the first and third 57 portions. In the embodiment shown, the second portion 56 has a cylindrical shape of revolution.

[0042] The first portion of the internal surface of the tubular body 41 forms a second axial imprint 64, capable of being assembled with the driving surface 30 of the nut 17.

[0043] Preferably, the second axial imprint 64 has a regular profile, deployed around the second axis 40. In the embodiment shown, the second axial imprint 64 has a section called “12 teeth”, as described in the aforementioned document FR3067768.

[0044] Preferably, the second axial imprint 64 and the driving surface 30 of the nut 17 are of substantially complementary shape.

[0045] The third portion 57 of the internal surface of the tubular body 41 has a substantially constant section along the second axis 40 and is configured according to a third anti-rotation shape. In particular, in the embodiment shown, the third portion 57 comprises a plurality of identical grooves 66, distributed angularly around the second axis 40.

[0046] The fourth portion 58 of the internal surface of the tubular body 41 has a radial dimension greater than or equal to a maximum radial dimension of the third portion 57. In the embodiment shown, the fourth portion 58 has a cylindrical shape of revolution and the internal surface of the tubular body 41 comprises a third shoulder 68, oriented towards the second end 55.

[0047] At the level of the fourth portion 58, the tubular body 41 comprises at least one first lateral slot 70, extending parallel to the second axis 40 between two closed ends. In the embodiment shown, the first slot 70 is in the form of an oblong hole, having an arc length 72, of angle a ([Fig.3]). The value of the angle a will be specified below.

[0048] In the embodiment shown, the tubular body 41 comprises two first slots 70, symmetrical with respect to a plane passing through the second axis 40 and forming the section plane of [Fig.4].

[0049] Furthermore, in the embodiment shown, the tubular body 41 further comprises two second slots 74 arranged at the level of the fourth portion 58. The second slots 74 are symmetrical to one another with respect to a plane passing through the second axis 40 and perpendicular to the plane of symmetry of the first slots 70.

[0050] The cover 52 has a central opening 76, of circular outline and has a diameter smaller than the diameter of the fourth portion 58. The cover 52 is assembled to the second end 55 of the tubular body, so that the central opening 76 is arranged centered on the second axis 40.

[0051] The rod 42 extends in the tubular body 41 along the second axis 40. More precisely, the rod 42 is movable in translation and in rotation in the tubular body 4L.

[0052] The rod 42 is visible in [Fig.5], separated from the tubular body.

[0053] The rod 42 comprises a head 80, a front portion 82, a collar 84 and a rear portion 86, aligned along the second axis 40.

[0054] The head 80 forms a first end of the rod 42 and is capable of being assembled to the first axial imprint 24 of the screw 16.

[0055] Preferably, the head 80 of the rod 42 has an anti-rotation shape, for example of hexagonal section. In a variant not shown, the section can be multi-lobed, or bihexagonal.

[0056] Preferably, the head 80 of the rod 42 and the first axial imprint 24 of the screw are of substantially complementary shape.

[0057] The front portion 82 of the rod 42, adjacent to the head 80, is cylindrical with a non-circular section. In the embodiment shown, the front portion 82 comprises a cylindrical surface 88 of revolution, arranged along the second axis 40, and two ribs 90 projecting relative to said cylindrical surface 88. The two ribs 90 are symmetrical to each other relative to a plane passing through the second axis 40.

[0058] A maximum transverse dimension of the front portion 82, at the level of the ribs 90, is less than a diameter of the second portion 56 of the tubular body 4L

[0059] The collar 84 is arranged between the front portion 82 and the rear portion 86 and forms a radial projection relative to said portions 82, 86. In the embodiment shown, the collar 84 is arranged in the fourth portion 58 of the tubular body 41 and has an external diameter slightly smaller than the internal diameter of said fourth portion 58.

[0060] In the embodiment shown, the rear portion 86 of the rod 42 passes through the central opening 76 of the cover 52, so as to form a second end of said rod, projecting axially relative to the tubular body 41.

[0061] In the embodiment shown, the rear portion 86 of the rod 42 comprises a third axial imprint 92 at the second end of said rod. The third axial imprint 92 has an anti-rotation shape, for example of square section.

[0062] The locking device 44 comprises a corolla 94 and a gripping member. In the embodiment shown, the gripping member is a ring 96, as detailed in the description below.

[0063] The corolla 94, visible in [Fig.5], is arranged in the tubular body 41 and comprises an external surface 100 and an internal surface 102, extending along the second axis 40.

[0064] The external surface 100 is capable of being assembled to the third portion 57 of the internal surface of the tubular body 41, by axial translation. More precisely, the external surface 100 has a shape substantially complementary to that of the third portion 57 of the internal surface of the tubular body 4L.

[0065] In particular, in the embodiment shown, the external surface 100 comprises a plurality of identical teeth 104, distributed angularly around the second axis 40. The number of teeth 104 is identical to the number of grooves 66 of the third portion 57.

[0066] Thus, each of the external surface 100 of the corolla 94 and of the third portion 57 of the internal surface of the tubular body 41 has an angular period [3, dependent on the number of grooves 66 and teeth 104. In the embodiment shown, the external surface 100 of the corolla 94 has forty-eight teeth 104 and the angular period [3 defined above is ±7.5°.

[0067] The internal surface 102 of the corolla 94 has a cylindrical shape. More precisely, the internal surface 102 of the corolla 94 is arranged around the front portion 82 of the rod 42, the corolla 94 being able to slide axially along said front portion.

[0068] In the embodiment shown, as visible in [Fig.2], the internal surface 102 of the corolla 94 comprises: a cylindrical surface 106 of revolution, arranged along the second axis 40; and two grooves 108 hollow relative to said cylindrical surface 106. Each groove 108 comprises two flanks 109 substantially parallel. Each rib 90 of the front portion 82 of the rod 42 is received in a groove 108.

[0069] As visible in [Fig.5], the surface 106 has a diameter substantially equal to the cylindrical surface 88 of revolution of the third portion 57 of the internal surface of the tubular body 41. Furthermore, each groove 108 has a thickness 110 slightly greater than a thickness 112 of the corresponding rib 90.

[0070] Thus, the rod 42 can pivot with a small clearance inside the corolla 94, the clearance being limited by the contact between each rib 90 with one or other of the flanks 109 of the corresponding groove 108. This small clearance makes it easier to fit the end 80 of the rod into the recess 24 of the screw.

[0071] In the embodiment shown, the corolla 94 further comprises two radial holes 114, perpendicular to the second axis 40.

[0072] The ring 96 allows an operator to move the corolla 94 from outside the tubular body 41.

[0073] In the embodiment shown, the ring 96 is arranged around the tubular body 41 and is able to slide axially on the tubular body 41 in the locking position or in the unlocking position.

[0074] The ring 96 comprises a gripping element 118 and two pins 116.

[0075] As visible in [Fig. 6], the gripping element 118 is a collar arranged on the outer surface of the ring, extending radially outward so as to be able to be grasped by an operator. Each pin 116 is arranged in the gripping element 118, perpendicular to the second axis 40, and successively passes through one of the first slots 70 of the tubular body 41 and one of the radial bores 114 of the corolla 94. Thus, the ring 96 is mechanically linked to the corolla 94, an axial or radial displacement of the ring causing the axial or radial displacement of the corolla, within the limits authorized by the locking and unlocking positions.

[0076] In the embodiment shown, a thickness of the pins 116 and the length of the arc of a circle 72 of the first slots 70 are chosen to allow the ring 96 to pivot relative to the tubular body 41 by an amplitude of angle a. Said angle a is 15° maximum, or two angular periods [3, when the corolla is not engaged with the third portion 57 of the tubular body. Indeed, a rotation by an angle of 15° is equivalent to a rotation in the clockwise direction of 7.5° and in the counterclockwise direction of -7.5°, which is equivalent to the angular period [3 of a tooth of the corolla. An angle of 15° thus allows the rotation of the ring 96 by a distance corresponding at most to one tooth of the corolla 94, in the clockwise or counterclockwise direction.

[0077] The locking device 44 is in the locked position when the external surface 100 of the corolla 94 is assembled to the third portion 57 of the tubular body 4L. locking device 44 is in the unlocked position when the external surface 100 of the corolla 94 is at a distance from the third portion 57 of the tubular body 41, and more precisely, when the corolla 94 is entirely arranged in the fourth portion 58 of the tubular body.

[0078] In the locked position, the ring 96 is arranged near the first end 54 of the tubular body, and completely covers the first marking 50. The second marking is visible.

[0079] In the unlocked position, the ring 96 is arranged near the second end 55 of the tubular body, and completely covers the second marking 50. The first visual marking is visible.

[0080] In the locked position, that is to say when the corolla 94 is engaged with the third portion 57 of the tubular body, the ring 96 cannot pivot, except within the limits of the manufacturing clearances of the teeth of the corolla.

[0081] In the embodiment shown, the ring 96 comprises two lateral lights 120, each of said lateral lights corresponding in dimensions and position to one of the second slots 74 of the tubular body 4L.

[0082] The first elastic return element 46 tends to axially move the rod 42 towards the first end 54 of the tubular body 4L.

[0083] In the embodiment shown, the first elastic return element is a first compression spring 46, arranged around the rear portion 86 of the rod 42 between the cover 52 and the collar 84.

[0084] The second elastic return element 48 tends to axially move the corolla 94 towards the head 80 of the rod 42.

[0085] In the embodiment shown, the second elastic return element is a second compression spring 48, arranged around the front portion of the rod 42 between the collar 84 and the corolla 94. Preferably, a stiffness of the second spring 48 is less than a stiffness of the first spring 46.

[0086] In Figures 2, 3 and 6, the tool 10 is shown in the locked position. In said locked position, under the action of the first 46 and second 48 springs, the corolla 94 is in axial abutment against the second shoulder 62 of the tubular body 41; the external surface 100 of the corolla 94 is assembled to the third portion 57 of the internal surface of the tubular body 4L

[0087] Furthermore, in the locked position of the tool 10, each pin 116 is arranged close to a first end of the corresponding first slot 70, oriented towards the first end 54 of the tubular body 4L.

[0088] A method of using the installation tool 10 described above will now be described. More particularly, the installation assembly 12 described above, comprising the tool 10 and a screw-nut assembly 14 capable of being installed at by means of said tool 10. The method relates to the installation of the screw-nut assembly 14.

[0089] In an initial state of the assembly 12, the tool 10 is in the locked position described above and the screw-nut assembly 14 is in the installation configuration described above. It is considered in particular that the second end (not shown) of the screw 16 is mounted on a support (not shown) and capable of pivoting about the first axis 20 relative to said support.

[0090] First, an operator positions the tool 10 relative to the screw-nut assembly 14 so that the first 20 and second 40 axes coincide, as seen in [Fig. 6]. The operator then approaches the front of the tool 10 to the screw-nut assembly 14, so as to fit the second axial imprint 64 of the tubular body 41 onto the driving surface 30 of the nut 17, or to fit the head 80 of the rod 42 into the first axial imprint 24 of the screw 16.

[0091] In the case where the angular positions of the driving surface 30 of the nut 17 and of the first axial imprint 24 of the screw 16 correspond to the respective angular positions of the second axial imprint 64 of the tubular body 41 and of the head 80 of the rod 42, the fitting of said head 80 to said first axial imprint 24 takes place simultaneously with the fitting of said second axial imprint 64 to said driving surface 30. In fact, the head 80 of the rod 42 is pushed towards the screw-nut assembly 14 by the first spring 46.

[0092] On the other hand, in the case where said angular positions do not correspond, the operator axially moves the ring 96 backwards, i.e. towards the cover 52, so as to reach the unlocked position. Each pin 116 then approaches a second end of the corresponding first slot 70, oriented towards the second end 55 of the tubular body 4L. The second spring 48 compresses and the corolla 94 moves along the rod 42, up to the fourth portion 58 of the internal surface of the tubular body 4L. The corolla 94 is then able to pivot relative to the tubular body 4L.

[0093] Preferably, the action of the operator on the ring 96 only leads to minimal compression of the first spring 46, due to the stiffness of said first spring, greater than that of the second spring 48.

[0094] While holding the ring 96 towards the rear of the tubular body 41, the operator then slightly pivots the ring 96 relative to the tubular body 41, within the limit of the arc length 72; the pins 116 move in the slots 70, within the limit of + / - 7.5° so that the tubular body 41 and the rod 42 are correctly positioned both in the axial imprint 24 of the screw, and on the driving surfaces 30 of the nut. Driven by the pins 116 and by the corolla 94, the rod 42 also pivots relative to the tubular body 4L. The head 80 of the rod 42 thus fits into the first axial imprint 24 of the screw 16 under the action of the first spring 46.

[0095] Then, the operator releases the ring 96 which moves forward, under the action of the second spring 48 which relaxes. The corolla 94 moves along the rod 42 towards the third portion 57 of the internal surface of the tubular body 41, up to the third shoulder 68.

[0096] The angular position of the teeth 104 of the corolla is then aligned with the angular position of the grooves 66, the corolla 94 is inserted axially into the third portion 57 of the internal surface of the tubular body 41, up to the second shoulder 62. The tool 10 is again in the locked position.

[0097] At this stage of the method, the tool 10 is fitted onto both the screw 16 and the nut 17 as described above. The corolla 94 is locked in rotation relative to the tubular body 41 by the teeth 104 and the grooves 66, as described above, and the rod 42 is locked in rotation relative to the corolla 94.

[0098] Next, the operator fits an actuating member (not shown) onto the third axial imprint 92 of the rear portion 86 of the rod 42. Such an actuating member is for example a ratchet wrench, compatible with an axial imprint 92, for example of square shape.

[0099] By means of said ratchet wrench, the operator rotates the rod 42 and the tubular body 41, locked in rotation relative to each other.

[0100] The screw 16 and the nut 17 are rotated relative to the support, such as a pre-adjustment bench. Then, the screw-nut assembly 14, in the installation configuration, is for example installed on another support, such as an aircraft structure.

[0101] The installation method described above for the screw-nut assembly 14 maintains the axial distance 36 between the axial end 34 of the nut 17 and the first end 22 of the screw 16, with a possible slight variation linked to the angular clearances of the tool.

[0102] Once the tool has been removed, the alignment of the lateral slots 120 of the ring 96 and the second slots 74 of the tubular body 41 allows the operator to check that the tool 10 is ready for further use. If the lateral slots 120 and the slots 74 are misaligned, the operator must axially shift the ring 96 rearward and pivot the ring so that the lateral slots 120 and the slots 74 are aligned.

Claims

1. Claims Tool (10) for installing a screw-nut assembly (14), the screw-nut assembly comprising: - a screw (16) extending along a first axis (20), one end (22) of said screw comprising a first axial imprint (24), configured according to a first anti-rotation shape; the screw comprising a thread (26) near said end; and - a nut (17) disposed close to said end of the screw, engaging with said thread, the nut comprising a drive surface (30) configured according to a second anti-rotation shape; the installation tool comprising: - a tubular body (41) extending along a second axis (40), a first open end of the tubular body comprising a second axial imprint (64) capable of being assembled to the driving surface (30) of the nut; - a rod (42) extending in the tubular body along the second axis, a first end of the rod comprising a head (80) capable of being assembled to the first axial imprint (24) of the screw; and - a device (44) for locking the rod in rotation in the tubular body; so as to allow, in a so-called locked position of the tool, simultaneous rotational driving of the screw (16), by the head (80) of the rod (42) engaged with the first axial imprint (24) of said screw; and of the nut (17), by the second axial imprint (64) of the tubular body (41) engaged with the driving surface (30) of said nut; and so as to allow, in a so-called unlocked position of the tool, a relative rotation of the rod and the tubular body (41) capable of aligning the second axial imprint (64) with the driving surface (30) of the nut, or capable of aligning the head (80) of the rod with the axial imprint (24) of the screw; the installation tool being characterized in that: - the tubular body (41) comprises an internal radial surface (57) configured according to a third anti-rotation shape; - the rod (42) comprises a cylindrical portion (82) of non-circular section; and - the locking device (44) comprises a corolla (94), arranged along the second axis in the tubular body, said corolla comprising: - an external radial surface (100), capable of assembling with the internal radial surface (57) of the tubular body, so as to lock the corolla in rotation relative to said tubular body; and - a cylindrical internal surface (102), capable of sliding axially along the cylindrical portion (82) of the rod.

2. Installation tool according to claim 1, wherein the outer radial surface (100) of the corolla (94) is capable of assembling with the inner radial surface (57) of the tubular body (41) according to a plurality of angular positions, arranged according to an angular period (|3).

3. Installation tool according to claim 2, wherein: - the tubular body (41) comprises at least one first lateral slot (70), extending parallel to the second axis between two closed ends; and - the locking device (44) further comprises a ring (96), fixed to the corolla (94) and capable of moving axially in the at least one first slot (70) so as to drive said corolla in translation.

4. Installation tool according to claim 3 wherein the at least one first lateral slot (70) has, in a plane extending perpendicular to the second axis, a length of a circular arc (72) of angle (a), the angle (a) being substantially equal to twice the angular period (|3) of the corolla (94).

5. Installation tool according to one of claims 3 or 4, further comprising at least one pin (116) arranged in the ring (96) and successively passing through one of said first lateral slots and a radial drilling of the corolla (94).

6. Installation tool according to one of claims 3 to 5, comprising at least one marking (50, 51) on an outer surface of the tubular body (41), the ring (96) covering or uncovering one of the markings (50, 51) depending on the locked or unlocked position of the tool (10).

7. Installation tool according to one of the preceding claims, comprising a first elastic return element (46), tending to axially move the rod (42) towards the first end (54) of the tubular body.

8. Installation tool according to claim 7, comprising a second elastic return element (48) tending to axially move the corolla (94) towards the first end of the rod (42).

9. An installation assembly (12), comprising: - a screw-nut assembly (14), said screw-nut assembly comprising: a screw (16) extending along a first axis (20), one end (22) of said screw comprising a first axial imprint (24), configured according to a first anti-rotation shape; the screw comprising a thread (26) near said end; and a nut (17) disposed near said end of the screw, engaging with said thread, the nut comprising a drive surface (30) configured according to a second anti-rotation shape; and - an installation tool (10) according to one of the preceding claims, the second axial imprint (64) being capable of assembling with the driving surface (30) of the nut (17) and the head (80) of the rod (42) being capable of assembling with the first axial imprint (24) of the screw (16).

10. A method of implementing an installation assembly (12) according to claim 9, comprising the following steps: - providing the installation tool (10) in the locked position; - engaging one of the driving surface (30) of the nut (17) with the second axial imprint (64) of the tubular body (41); and the head (80) of the rod (42) with the first axial imprint (24) of the screw (16); then - actuating the locking device of the installation tool (10), so as to unlock the tool (10); and rotating the rod (42) relative to the tubular body (41); - engaging the other of the head (80) of the rod (42) with the first axial imprint (24) of the screw (16) and the driving surface (30) of the nut (17) with the second axial imprint (64) of the tubular body (41);- actuation of the locking device of the installation tool (10), so as to lock the tool (10) and prevent rotation of the rod (42) relative to the tubular body (41); then - rotational driving of the installation tool (10), so as to simultaneously rotationally drive the screw (16) and the nut (17) of the screw-nut assembly (14).;

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