FR2643690A1 - Screw-type fixing device, and support assemblies for a television set including this device - Google Patents

Abstract

Screw-type fixing device allowing dismantling only with a special tool and intended to secure two elements by means of a bolt, the screw of which, with a head 71; 171; 361, bears on one of the elements, and the nut 6; 106; 308 of which bears on the other element, the nut not being accessible after the fixing has been tightened by screwing the bolt. The screw head 71; 171; 361 is located in a volume, one end 46; 146 of which acts as a support for the said screw head 71; 171; 361, of which the face which is opposite the said bottom is open to allow the passage of the special tool 8 used for dismantling, and of which the side wall 44a; 144a is continuous or non-continuous, and is located, at at least some zones, very close to the volume described by the screw head as the screw 7; 107; 306 rotates. Support assemblies for a television set including this device with an anti-theft nature.

Description

SCREW FIXING DEVICE AND SUPPORT ASSEMBLIES TE TELEVISION STATION INCLUDING THIS DEVICE.

 The present invention relates to a fixing device allowing disassembly only with a specific tool and support assemblies for television sets comprising said device.

Many systems are known which allow two elements to be secured by means of a bolt, the two elements being crossed by the bolt screw, the screw head resting on one of the elements and the nut resting on the other element. In the rain
In the art of systems existing up to now, the screw head is easily accessible and can, for example, be unscrewed using a simple multiple key commonly marketed.

 The present invention relates to a screw fastening system which constitutes protection against traffic. or who has. at the very least, a dissuasive action.

 The present invention relates to a screw fixing device allowing disassembly only with a specific tool, this device for securing two elements by means of a bolt whose screw a head resting on one of the two preferred elements and whose l nut rests on the other element, the nut not being freely accessible from the outside after tightening of the fixing by screwing the bolt, characterized in that the screw head is arranged in a volume, one of which bottom serves to support said head, whose face opposite said bottom is open to allow the passage of the s-2ifique tool used for disassembly and whose side wall, continuous or not, between said face and the fort. is located. at least in certain areas, very close to the volume described by the screw head during the rotation of the screw.

 The screw head preferably has. a contour constitutes either of a straight cylinder fluted along its generatrices over its entire lateral surface, or of a straight prism, with a polygonal base, in particular octagonal.

 The nut advantageously constitutes an insert in one of the two elements to be joined or in a fixed member on such an element, This insert can be embedded in one of the two elements to be joined at the time of construction of the element or reported later. The nut can be replaced by a female thread made directly in one of the elements to be joined.

 The volume, where the screw head is located, is. preferably, formed in a support plate intended to be applied by that of its faces where said volume does not open, on one of the two elements to be joined. Said volume can also be formed in one of the two elements to be joined.

 According to a first variant, the volume is formed in a support plate and it is constituted by a cylindrical bore formed in the thickness of said support plate. In this variant, the cylindrical bore preferably has a depth, measured according to the axis of the bore. such that the surface of the screw head opposite the surface resting on the bottom of the volume is located inside said volume. Therefore, the screw head is sort of at the bottom of a well and is not accessible using an open-end wrench.

 It should be noted that the support plate is preferably fixed to one of the elements to be joined so as to be blocked in rotation. This fixing is, Far example carried out using headless nails c embostage force.

 According to a second variant, the volume where the screw head is arranged, is defined laterally by the tangential edges of punctures obtained by swirling of the support plate or of the element sc: idarize, with rupture of material along a line located in the vicinity of the hole for the passage of the screw rod through the support plate or the element to be identified. The number of punctures is preferably odd, for example three or five. Indeed, when the punctures are odd, any space between the first two punctures is diametrically opposed to a third puncture, which removes any possibility of slipping tool in the space between two punctures, to turn the screw.

 The device according to the present invention operates the following baleen: the specific tool is introduced by the face opposite the bottom of the volume or.

is arranged the screw head so that said tool is inserted between the side wall of said volume and the head of the screw and that it has taken on said screw head. The specific tool is then rotated so as to either screw or unscrew the screw.

 The device according to the present invention is particularly suitable for fixing television sets on a plate and / or for fixing ur: e plate carrying a television set on a piece of furniture or on an articulated arm. Indeed, it is well known that in communities such as hospitals, clubs, hotels and the like, television sets are frequently stolen and that it is particularly useful for the fixing device to prevent or, at the very least, makes theft difficult. A second object of the invention is therefore a support assembly for a television set comprising at least one fixing device according to the present invention.

 According to a first embodiment. said support assembly for television set comprises a plate on which is fixed the base of the cabinetry of the television set, and it is characterized in that said plate and said base are secured by at least one device according to the invention , the volume, in which the screw head is arranged, being formed in the plate and otant defined laterally by the tangent edges of punctures obtained by stamping the plate, the nut being disposed in said base.

 According to a second embodiment, said support assembly for a television set comprises a plate carrying said station capable of pivoting about an axis, said plate being equipped with a sleeve capable of rotating in a sheath secured to a carrying member. , the connection of the plate with said carrier member being ensured by means of a device according to the invention; said support assembly is characterized in that the support plate is force-fitted into the liter end of the sleeve and the nut of the bolt is inserted into a nozzle force-fitted to the end of the sleeve, which is the one closest to the plate, the rod of the bolt screw being arranged along the axis common to the sleeve and the sleeve and securing the support plate and the end piece.

According to a third embodiment, the support assembly for a television set, comprises a pivoting base consisting of a lower plate fixed on a support and a plate integral with said pcste, the plate and the lower plate being interconnected by a ball system allowing relative rotation of the plate relative to the lower plate; it is characterized by the fact that the infarious pla tea is associated with a nut which cooperates with the threaded rod of a screw passing through the support, the head e of the screw cooperating with a support plate, the
device for fixing the lower plate to the
support then being a device according to the invention.

Preferably, the first mode of
achievement is associated with the second or third
moces of achievement. In other words, the post of
television can be fixed on the plate by at least
a fixing device according to the invention and, in
same time. the plate can be fixed on a support
OR an articulation arm using a device
dry the invention.

To better understand the purpose of
the invention, we will describe below, purely
illustrative and non-limiting, several modes of
realization represented on the attached drawing.

On this drawing :
- Figure 1 shows in vertical section
a television set support combining
the first and the second embodiment of the
fixing device. in which the post of
television is fixed to the Far plate a device for
fixing according to the second variant of the invention and
12 plate is fixed to an articulation arm by a
fixing device according to the first variant of
the invention;
Figure 2 shows a view along ll-ll
of figure 1
- Figure 3 shows a view along 111
111 of figure 1
FIG. 4 represents, in side view,
a specific tool for assembly and disassembly
fixing devices illustrated in Figures 1 to 3;
- Figure 5 shows, in elevation, a
second television support assembly combining the
first mode of realization and the third mode of
realization of the ee.on fixing device
the invention:
- Figure 6 is a view along VI-VI of Figure 5
- Figure 7 is a sectional view of the central screw fixing device of the support assembly shown in Figures 5 and 6
- Figure R shows another form of reaisation of the fixing device of Figure 7
The television support assembly shown in FIG. 1 comprises a plate 1 on which is fixed by the base 9 of its cabinet, a television po, by means of fixa ti-n devices designated as a whole by 14; the plate is itself fixed on an articulation arm 2 by a fixing device designates as a whole by 5. We see in Figure 1 that the plate i is provided in its center with an orifice 11, which is bordered by a matrix collar 12 in which is welded a cylindrical sleeve 13. Said sleeve 13 is arranged so that its axis is vertical, and the plate 1 is slightly inclined relative to a horizontal plane
The articulated arm 2 carries at its free end a cylindrical sheath 21, which is arranged around the sleeve 3, coaxial with the latter. The sleeve 13 can pivot freely inside the sleeve 21.

 The sleeve 13 is closed, at its upper part, by a nozzle 3 and the sheath 21 is closed, at its lower part, by a support plate 4. The nozzle 3 and the support plate 4 are fitted S force respectively in the sleeve 13 and in the sleeve 21 so as to be locked in rotation.

Said nozzle 3 and said support plate 4 are preferably made of deformable plastic and can be provided with vertical grooves.

 The end piece 3 and the support plate 4 are connected by a screw fixing device 5 co-orting a nut 6 inserted in the end piece 3 and a screw 7, the head 71 of which is contained in a volume constituted by a cylindrical bore 44 formed in the support plate 4.

 The end piece 3 is a plate formed by two cylindrical parts: an upper part 31 having a diameter equal to the outside diameter of the sleeve 13 and a lower part 32 having a diameter slightly greater than the inside diameter of the sleeve 13. which is connected to force in said sleeve 3.

the parts 31 and 32 being connected laterally to the periphery by a horizontal flap 33. The lower part 32 is forced into the sleeve 13, the flap 33 rests on the upper edge of said sleeve 13 and the upper part 31 is located above said upper rim1 inside the defined volume Far the stamped collar 12. In the upper part is inserted, in a bore, the nut 6, in which is formed a threaded cylindrical bore 61 having an equal diameter, with the necessary clearance near, to that of the rod 72 of the screw 7. The nut 6 could be. according to the invention, replaced by a threaded thread drilled directly in the nozzle 3.

 The support plate a is composed of two coaxial cylindrical parts: an upper part 41 having a diameter slightly greater than the internal diameter of the sleeve 21, which is force-fitted into the latter, and a lower part 42 having a diantre equal to the outside diameter of the sheath 21, the parts 41 and 42 being connected directly to the periphery by a horizontal flap 43. When the assembly is assembled, the upper part 41 is force-fitted into the sheath 21, the flap 43 s' pressing on the lower edge of the barrel 21 and the upper part 42 being arranged outside the sheath 21. The support plate @ is pierced by two coaxisux cylindrical bores communicating with each other. The bore of larger diameter 44 constitutes the volume containing the head 71 of screws, the walls 44a of this volume being continuous. The diameter of the bore is close to the diameter of the volume described by the screw head during the rotation of the screw. The bore is formed in the lower part 44 of the support plate 4 and opens towards the 'outside. The bore 45 has a diameter equal to the necessary clearance almost to that of the rod of the screw 72. Between the two bores 44 and 45 is a flat annular bottom 45 which serves to support the whole of the screw 71 when the fixing device is mounted. The axis of the screw 7 is the same as that of the ma han 13 and the sleeve 21.

 The head 71 of the screw has, according to the embodiment shown in Figure 1. a contour.

constitutes by a right prism having as a base a regular octagon. The screw head can have other polygonal shapes or cylindrical shapes with indentations. Preferably, a shape and dimensions are chosen such that there is no commonly available commercially tool, in particular a pipe wrench, for removing the screw.

 According to the embodiment shown in Figure 1, the surface 71a of the screw head, opposite to that opposing on the bottom is arranged at a level such as the bore 44 that it is located inside said bore 44, the surface 71a of the screw located above the flat 43 (in the embodiment shown in FIG. 1). In this way the screw head 71 is protected laterally by the sheath 21 and it is impossible to disengage the screw head by cutting, for example with a saw. the part 42 of the support plate to create a groove in the head.

As can be seen in Figure 1, the television set is fig. by its base o to
plate 1 by fixing devices according to
the invention generally designated by 14. The plate 1 being generally rectangular, said plate 1 is generally connected by four devices 14 arranged at each of the angles. Each fixing device 14 comprises a nut 16 which is under the force of an insert in the base 9, and which is pierced with a female thread 161; a screw 17 comprising. a head 171 and a rod 172, which is screwed into the thread 161; and a volume 144, in which the screw head 171, which also has the shape of an octagon, rotates. According to the embodiment shown in FIG. 1, the volume 144 is defined laterally by the tangential edges of the floods 14 obtained by stamping the plate 1, with material breaking along a line situated in the vicinity of the through hole 145 of the threaded rod 172 through the bottom 146. The wall 144a thus defined is therefore discontinuous. Punctures 147 cannot be flattened by crushing or hammering. In fact, during stamping, the sheet is deformed and cannot return to its initial state. The number of floods 147 is preferably an odd number: five according to the embodiment shown. An odd number is advantageous because, as can be seen in FIG. 3, if one seeks to introduce a tool, diametrically, in the space between two first punctures 147 neighbors, the tool collides with a third puncture 147 which is diametrically opposite.

The special tool required for assembly and disassembly is, according to the embodiment shown, the same for the screws 7 and 17. It is illustrated in FIG. A and it is designated as a whole by the reference 6. It is constituted by a tube wrench having an internal bore 81 having, in section perpendicular to its longitudinal axis, a
octagonal shape complementary to that of the heads of
screws 71 and 171 and an equal outside diameter, to the clearance
necessary near. the inside diameter of the bore ai
and volume 144. When the screw head has a shape
octagonal. the thickness of the side walls of the key
is relatively regular which is advantageous because
we can have thin walls and the
weight of material required is lower. Else
apart, the space between the screw head and the wall of the volume in which the screw turns is weakened.

I! there is therefore no zone OR we can, possibly-
insert a pair of pliers. In addition, thin-walled keys are not usual. The tube wrench is
crossed by a rod 82 for gripping it manually to keep it quiet.

When mounting the television set on
its support, the end piece 3 is force-fitted onto the sleeve 13 secured to the plate -1. Then we fix
the television set by its base 9 on the
plate 1 using the fixing devices 14 using the special key 8. It is also fitted å
forces the support plate 4 under the sleeve 21. For
finish we attach the nozzle 3 and the support plate 4 to
using the fixing device 5. To carry it out
disassembly we operate in reverse.

We see that in the absence of the key 6
specifically corresponding to the screw head 171 it
it is impossible to separate the base 9 from
the cabinet work of the television set on deck 1.

The 147 punctures cannot be flattened by mar
telage and the head 171 of the screw is not accessible
because it is fully arranged inside the
volume 144. Similarly, it is impossible to dissociate
the plate I of the arm 2. In fact, the nut 6 is not accessible, because it is in the form of an insert in
the nozzle 3, and, moreover, access to the nozzle 3 is difficult, if not impossible, when the television is fiyé on the plate 1. The screw head 71 being inside the volume in which it rotates , it is impossible to grasp it with a flat key. Furthermore, the octagonal shape of the screw heads 71. 171 unusual size, it is necessary to have the key corresponding specifically to the shape of said screw heads to be able to disassemble the device. fixation. In addition, the choir of a screw head 71. 171 of octagonal section makes it possible to have a key having thinner plots than those of the clos usually used. The risks of theft of the television set are thus very clearly reduced.

 Figures 5 and 6 show another embodiment of a support assembly according to the invention. This support assembly comprises a pivoting base formed by a plate 303, on which is fixed, by its base. the television set and night is fixed by a lower plate 321 on a support 302; support 302 is the upper shelf of a piece of furniture. The lower plate 301 and the plate 303 are connected by an annular path with balls 304 allowing relative rotation of one with respect to the other. The plate 3 # 3 and the base of the television set are fixed by a åispoci- fixing plate 314 identical to the fixing device tic 14 illustrated in FIGS. 1 and 3. The lower plate 301 and the upper shelf of the cabinet 302 are secured by a screw fixing device designated as a whole by 305. Two versions of this device $ 3 # 5 are shown in detail in Figures 7 and 8.

 The device. fixing plate 3 # 5 includes a 3 # 6 screw, a support plate: 307 and a nut 309.

 The nut 3 # 8 is in the form of an insert in the lower plate 3 # 1. The screw 306 has a head 381 and a threaded rod 362 which passes through the thickness of the upper shelf 302 of the cabinet and cooperates with the threaded bore 3P1 of the nut 308 The support plate 3 # 7 has a volume constituted by a bore 37a in which the screw head 361 is inserted. In FIGS. 7 and 6, this bore 374 is cylindrical. The support plate 307 may include a projecting part 371, which is inserted in a bore 321 corresponding to the upper shelf 302 of the cabinet, as shown in FIG. 7. According to the version shown in FIG. 8, the face of said support plate 307a, which is in contact with the upper shelf 3 # 2 of the piece of furniture is flat, the upper shelf of the piece of furniture not being bored outside the practical for the passage of the screw.

 The support plates 3 # 7 and 307a are fixed to the upper shelf 3 # 2 of the cabinet by headless nails 372, which blocks them in rotation.

Claims (12)

 1 - Screw fixing device allows disassembly only with a specific tool (18), this device making it possible to secure two elements by means of a bolt, the screw of which has a head resting on one of the two aforementioned elements and the nut of which rests on the other element, the nut not being accessible from the outside after tightening of the fixing by screwing the bolt, characterized in that the head of the screw (71; 171; 361) is arranged in a volume (44 144 374), a bottom (4'6; 146) of which serves to support said head (71; 171; 361), the face opposite of which bottom is open to allow the passage of the specific tool (8) used for disassembly and whose side wall (44a 144a), continuous or not, between said face and the bottom (46; 146), is, at least in certain areas, very close of the volume described by the screw head during the rotation of the screw (7; 17).  2 - Device according to claim 1, characterized in that the screw head has an outline consisting either of a straight cylinder grooved along its generatrices over its entire lateral surface, or of a straight prism with a polygonal base (71; 171; 361).  3 - Device according to claims 1 or 2, characterized in that the nut (6; 16; 3 # 8) constitutes an insert in one of the two elements to be joined or in a member fixed to such an element.  4 - Device according to -les claims 1 or 2. characterized in that the nut is constituted by a female thread made directly in one of the elements to be secured,  5 - Device according to one of claims 1 to 4. characterized in that the volume (44: 374) or is disposed the screw head, is formed in a support plate (4; 3 # 7) for apply, by that of its faces where said volume (44; 37a) does not open on one of the two elements to be joined.  6 - Device according to one of the claimants 1 ss 4, characterized in that the volume (144) where the screw head is arranged <361) is formed in one of the two elements to be secured.  7 - Device according to claim 5, characterized in that the volume (44; 374) is a cylindrical bore.  8 - Device according to claim 7.  characterized in that the cylindrical bore (44; 374) housed in the support plate (4; 307) has a depth measured along the axis of the bore such that the surface of the screw head (71; 361) opposite the surface resting on the bottom of the volume is located inside said volume.  9 - Device according to one of claims 5, 7. or 8, in that the support plate (4; 3 # 7) is fixed on one of the elements to be joined so as to be locked in rotation.  10 - Device according to one of claims I to 6, characterized in that the volume (144) where the screw head is disposed (171) is defined laterally by the tangential edges of punctures (147) obtained by stamping the support plate or element to be joined (1) with material rupture along a line located in the vicinity of the through hole (14R) of the threaded rod (172) of the screw (17) through the support plate or element to be joined  It - Device according to claim 1Z, characterized in that the number of punctures (147) is odd.  12 - Support assembly for television set. comprising a plate (i) on which the base (9) of the cabinetry of said television set is fixed, characterized in that said plate (1) and said base (9) are fixed by at least one device according to claim 9. the volume in which the screw head is disposed being, defined laterally by the tangential edges of punctures (147) obtained by stamping the plate (1), the nut being placed in said base (9).  13 - Support assembly for television set, comprising a plate (1) carrying said pcste and capable of pivoting about an axis, said plate (1) both equipped with a sleeve (13) capable of journalling in a sheath ( 21) ground i-daire of a carrier member (2>, the connection of the plate with said carrier member being ensured by means of a device according to one of claims 5 to 1B, characterized in that the plate d 'support (4) is applied to the free end of the sleeve (21) and sue the nut (6) of the bolt is inserted in a nozzle (3) placed at the end of the sleeve (13) which is the one closest to the plate, the rod (72) of the bolt screw being arranged along the common axis of the key sleeve and of the sleeve (21) and joining the support plate t4) and the end piece (3).  14 - Support assembly for television set, comprising a pivoting base consisting of a lower plate (3 # 1) fixed on a support (32) and an upper plate (33) integral with said station, the two plates being linked between them by a ball system (3 # 4) allowing relative rotation of the upper plate (33) relative to the lower plate (381), characterized in that the lower plate (3 # 1) is associated with a nut (3 # 8), which cooperates with the threaded rod (362) of a screw (3 # 6) passing through the support (32), the head of the screw cooperating with a support plate (37), the fixing the lower plate to the support being of the type defined in one of claims 4 to 9.