FR2521504A1 - PROTECTIVE DEVICE FOR FIXING AT THE BACK OF A TRACTOR CHASSIS - Google Patents

Abstract

TO PROTECT THE POWER TAKE-OFF SHAFT 41 OF A TRACTOR AGAINST UNINTENTIONAL CONTACT, THE DEVICE 10 INCLUDES AN INTEGRAL SET OF VERTICAL SIDE WALLS 11A, 11B BETWEEN THE SHAFT 41, A LOWER PART 13, 13 THANKS TO WHICH THE DEVICE 10 IS MOUNTED ON THE REAR WALL OF THE FRAME OF THE TRACTOR, AND AN UPPER WALL 30 PROVIDED BETWEEN THE SIDE WALLS 11A, 11B TO PROTECT THE SHAFT 41 AGAINST CONTACT FROM ABOVE; THE WALL 30 IS MOUNTED USING PIVOTING PINS 32 BETWEEN THE SIDE WALLS 11A, 11B SO TO ROTATE AROUND A HORIZONTAL AXIS AND TO BE LOCKED IN A LOWERED POSITION, WHICH IS THE PROTECTIVE POSITION PROPERLY SAID, AND SO AS TO BE FIXED IN A TEMPORARY RAISED OR INTERMEDIATE POSITION WHICH FACILITATES ACCESS TO THE SHAFT 41.

Description

Protective device intended to be fixed at the rear

of a tractor chassis.

  The present invention relates to a protective device

  tion intended to be fixed to the rear of a tractor and intended mainly to protect the shaft (s)

  force the tractor against accidental contact.

  The safety regulations concerning work and applying to tractors prescribe that the PTO shaft or shafts, also called PTO shafts, are fitted with protective devices preventing unintentional contact of PTO shafts Several different dimensions or ranges of dimensions are indicated in

  standards for these protective devices.

  As is known in the prior art, the protective devices in question have been constituted by a fixed upper guard plate avoiding contact from above. Several fixed lateral guard plates have also been used, these latter being

  guard separated from the upper guard plate.

  In addition, and as is known in the prior art, cup-shaped guard plates have been used.

  arranged above the PDF tree.

  These protective devices known in the art present

  have several disadvantages The fixed upper guard plate prevents the connection of the PTO shaft with the end of the PTO shaft The fixing of separate side guard plates on the tractor is also a disadvantage Instead of a leg for a fixed push bar, we have often felt the need to use a tab for an equivalent and vertically adjustable push bar,

  and a traction fork equivalent to the fixing position

  adjustable tion The use of these elements in combination with said protection devices of the prior art poses problems coming first from the limited space in which they are arranged and then from the fixing points

necessary for said elements.

  The object of the present invention is to propose a new protection device of the type mentioned above, by means of which the disadvantages mentioned can be avoided and having several practical advantages

  important, which are described below.

  To achieve the goals mentioned above, the invention

  tion is essentially characterized in that the disposi-

  protective structure consists of an integral assembly with substantially vertical side walls, between which the PTO shaft (s) are arranged, and comprising a lower part by means of which the protective device can be fixed to the rear wall of the chassis of the tractor, and an upper guard plate disposed between said side walls in order to protect the PDF shaft (s)

  against contacts coming mainly from above.

  According to the invention, a protective device is obtained.

  Integral tion comprising, in combination, an upper guard plate adjustable in position and fixed side guard plates To the upper guard plate of the protection device of the invention is also advantageously added the tab intended for the push bar According to a preferred embodiment of the invention, the lateral protective elements in the form of plates are provided with arrangements such as perforations

  in which a towing fork can be mounted

  tion and a tab for the push bar, these two elements being adjustable in the vertical direction, and a locking means ensuring the maintenance in the raised position

of the traction hook.

  The PDF guard plate of the invention can also be advantageously used to constitute fasteners intended for the internal limit stops of the drawbars fixed to the hydraulic lifting means of the

tractor.

  In addition, the bottom plate of the protective device

  tion of PDF of the invention can also be used with advantage of fixing point for a guard plate in

bowl shape for the PDF tree.

  According to the teachings of the invention, an integral protection device is obtained to which several different functions can be assigned, but without however resulting in a disturbance or an inconvenience for the function.

  main and fundamental protection of this provision

  Thanks to the invention, it is possible to use it.

  effectively clamp the rear part of the tractor, which is very important from the point of view of the various functions which the tractor has to fulfill, and to which most of the most important elements of the tractor are fixed, namely the PTO shaft (s), the fixing lugs, and various adjustable forks and traction lugs When implementing the present invention, all of these elements can advantageously be combined into an effective protection device which complies with the regulations of

protection currently in effect.

  The invention will be described in detail in the following, with reference to an embodiment presented in the accompanying drawings, and to the details of which the invention is not limited, drawings in which: FIG. 1 represents the device for protection of the invention, seen from the rear of the tractor; Fig 2 shows the object of Fig i in elevation, the traction hook being in the upward facing position; Fig 3 is an axonometric projection of a fork

  vertically adjustable and possibly used

  ment in conjunction with the invention protection device

  tion; and Fig 4 is a view similar to Fig 3 of a tab

  for vertically adjustable push bar and optionally-

  used in conjunction with the protective device

of the invention.

  The protection device 10, presenting itself sensitive-

  ment in the form of a box, is in the figures shown attached to the rear wall of the chassis of the tractor (not shown) The device this protection 10 comprises

25215 D 4

  fixed side walls 11a, lin, connected at the top by a plate 13 In addition to the plate 13, the lower part of the protection device 10 comprises plates 13 'in which are provided tapped holes 29 Thanks to the holes 29 and to holes 26 made in the plate 13, - the protection device 10 is fixed to the chassis of the

  tractor On the plate 13 are mounted fixing lugs

  tion 24 intended for the push bar of the three-point lifting device of the tractor, and in which are provided holes 25 intended for fixing the eyelet of the upper end of the push bar In connection with the lower part of the protection device 10 are provided locking means ensuring the maintenance

  in the raised position of the traction hook 17.

  The traction hook consists of a substantially horizontal body 19, fixed at its front end in a manner known per se in this field of technology below the chassis of the tractor. This fixing is not visible in the figures. part 19 of the chassis is

  connected a lifting rod 17 carrying at its ends des-

  pins 15 a, 15 b which are connected to the lifting means (not shown) of the traction hook 17 These lifting means are connected in a manner known per se in the field of hydraulic lifting means of tractors At the same time as the lifting rod 14 are connected blocking members 16 a, 16 b facing upwards and the upper part of which faces forward, arranged between the lateral guides 18 a, 18 b When they are pressed against the c 8 internal tees of the guides 18 a, 18 b, the guides 16 a and 16 b direct the components 14, 17, 19 towards their own positions, the upper end of the guides 16 a and 16 b being

  blocked at the rear of the rod 20 as shown in Fig 2.

  The rod 20 is mounted in substantially triangular openings 21 provided in the lateral guides 18 a, 18 b, these openings having a rounded bottom so that the rod can rotate on their lower side The rod 20 is provided with a spring which maintains the rod in its rearward position and shown in Fig 2 But the rod 20 can be turned forward in its opening 21 so that the upper parts of the guides 16a and

  16 b are blocked at the rear of the rod 20.

  To release the blocking of the rod 20, the arm 22 is pulled which includes an extension extending into the driver's cabin. The rod 20 then rotates in its openings 21 towards its front position, and the guides 16 a, 1 b are released from their blocking Arm 22 is provided with a

spring 23.

  Fig 2 shows, locked around the traction hook 17, the traction eyelet 47 which is fixed for example to

  the end of the traction shaft of a tractor trailer

  tor. The lower parts of the side walls 11a and 11b of the protection device 10 are further connected to each other by a rod 37, fixed by keys 38a and 38b passing through holes in the walls 11a and 11b. The rod 37 prevents the pulling eye from jumping off the hook

  traction 17 when it is in its upper position.

  According to the invention, between the side walls 11a and 11b of the protection device 10 is mounted an upper guard plate 30 which can rotate by means of pivot pins 32 and be arranged in various positions La

  upper guard plate 30 prevents unintentional contact

  shut up the tree PDF 41, 42 from above According to the invention

  tion, the upper guard plate can rotate to a higher position 30 ', for example when a cardan shaft is connected to the end of the PTO shaft 41 In its

  normal protective position, the upper guard plate

  lower is in its lowered position shown in Fig 1 and 2 The upper guard plate 30 is locked in its normal lowered position by locking pins 34 a and 34 b, the ends of which pass through holes in the walls 11a and 11b The locking pins 34 a and 34 b are arranged inside a locking rod 31 mounted between the side cheeks of the upper guard plate 30 Between the pins 34 a and 34 b is provided a spring 33 at the against the action of which the pins 34 a and 34 b can be pushed by pressing pressure elements 35 a and 35 b towards one another in the slots 36 a, 36 b of the rod 31 Only the above-mentioned lowered position of the upper guard plate 30 is blocked, while this upper guard plate, when raised to its upper position 30 'or to any intermediate position, can be temporarily fixed using the pressure of the pins 34 a and 34 b acting against the internal c 8 tees of the walls 11a and 11b As a result, the upper guard plate returns to its normal protective position and is blocked 30 under the effect of vibrations, or else it is pushed by the bar traction of the three-point lifting means of the

  tractor which is fixed to the mounting brackets 24.

  As shown in Fig 2, a set of holes 40 is provided on the side walls 11 a and lib, by means of which

  can mount when desired a traction fork 50.

  As a variant, it is possible to mount in these holes 40 a tab for a push bar similar to the traction fork, and

  which is equivalent to tab 24.

  In Fig 3 is shown the traction fork 50

  which is adjustable in the vertical direction, and which is possibly-

  Lement used in connection with the protection device of Fig} and 2 The traction fork 50 comprises side tabs Sa and 51 b, provided with holes 52 a and 52 b The traction fork 50 can be mounted by means of these holes 52 a and 52 b between the side walls 11a and 11b, in association with the holes 40, using fixing pins The traction fork 50 can be fixed at two different levels The traction fork 50 carries a plate 53 fixed on it by screws 54 and to which the traction eyelet with holes 56 is attached The traction fork 50 can be used to tow various tools

  work or special shape trailers.

  In Fig 4 is shown a lug 60 similar to the traction fork 50 The lug 60 comprises end portions 61 a and 61 b provided with holes 61 a and 62 b, by means of which the lug can be mounted in the manner described below. above in the holes 40 of the side walls 11a and 11b in two different places The tab 60 has ears 65 provided with holes 66, to which the eyelet of a

push bar can be attached.

  We can see in Fig 1 and 2 two PDF trees 41 and 42 mounted one above the other and located inside the protection device 10 of the invention In most cases, we only use '' a single PDF tree that

  is normally located in the position of the shaft 41.

  The end of the shaft 41 is provided with a cup-shaped guard plate 43 made for example of plastic material and which, according to an advantageous embodiment of the invention, is blocked between the marginal parts

  lower plates 13 'of the protection device 10.

  the elastic protective bowl 43 includes a marginal shoulder 44, the lateral parts 44 'and 44 "of which are blocked between the lateral marginal parts of the plates 13', using the reversible deformation of the protective bowl 43 The blocking can be released, or vice versa the protective bowl 43 in place, by exerting a pressure on the elastic protective bowl 43, which means that it can penetrate between the edges of the plates 13 ′ and / or be extracted therefrom. An equivalent protective bowl system can also be used in conjunction with

  the lower PDF tree 42 if it exists.

  The protective bowl 43, or the equivalent protective bowl of the shaft 42, is preferably fixed by a chalne so that it cannot be lost. In addition, a special location can be provided in connection with the plates 13 'for fixing temporarily the protective bowl

  each time a cardan shaft is coupled to the trees 41.

  We can see in Fig 1 and 2 the hydraulic pump 46 represented simply by its outline and which is also

  disposed inside the protection device, immersed

  diatly below the upper guard plate 30

  when it is in its lowered position.

  According to an advantageous embodiment of the invention, plates 12 a and 12 b are fixed on the external edges of the side walls 11 a and 11 b of the protection device, in the holes 28 of which shims are mounted

  adjustable These serve as lateral limit stops.

  them for the drawbars of the three-point lifting means of the tractor. As is obvious, and as already follows from the above, the invention is in no way limited to those of its embodiments, no more than those of the modes of

  realization of its various parts, having been more special-

  also envisaged; on the contrary, it embraces all

variants.

Claims (7)

  1 protection device (10) intended to be fixed to   the rear of a tractor, mainly intended to protect   manage the shaft (41) or the shafts f 41, 42) of the tractor power take-off against unintentional contact, characterized in that the protective device (10) consists, in the form of an integral assembly, of walls substantially vertical lateral (lla, 11 b) between which the shaft (41) or the shafts (41, 42) of PTO are arranged, and in a lower part (13, 13 ') by means of which the device protection (10) can be fixed to the rear wall of the chassis of the tractor, and in an upper guard plate (30) arranged between the side walls (lia, llb) to protect the shaft (41) or the trees (41, 42) PTO against contacts coming mainly from high.   2 protection device according to claim 1,   characterized in that the upper plate (30) of the device   protective fabric (10) is fixed by pivot pins -   ment (32), or equivalent, between the side walls (lia,   llb) so that it can rotate around a sensitive axis -   horizontal and able to be locked in the lowered position which is the protective position itself, and to be fixed in a raised or temporary intermediate position, which facilitates access to the drive shaft.   force (41) or for any other maneuver.   3 Protection device according to claim 2, characterized in that said upper guard plate (30) comprises, as locking means, a locking rod (31), inside which have been arranged   locking pins (34 a, 34 b) biased by a resistor   fate (33), the end of the pins being blocked in holes or the like made in the side walls (la, lib) of the protection device when the upper guard plate (30) is locked in its protective position proper, and in that said locking pins (34 a, 34 b), when they are pressed against the internal c 8 tees of the side walls (11a, 11b) of the protection device (10), also serve as means of fixing the upper guard plate (30) in its   raised position (30> and in its intermediate positions.   4 Protection device according to any dice   Claims 1 to 3, characterized in that on the cheek   (13) which connects the upper parts of the side walls   (lia, llb) of the protection device (10) and thanks to -   to which said device is partially fixed to the rear wall of the chassis of the tractor, there is mounted a lug (24) provided with holes (25) intended for the push bar of the tractor. Protection device according to any one of   claims 1 to 4, characterized in that on said   side walls (11a, 11b) of the protection device is provided with a set of holes (40), or equivalent fixing means, to which is fixed, in different height positions, a separate tab (60) for push bar and / or for an equivalent traction fork (50) (Fig 3 and 4).   6 Protection device according to any one of   Claims 1 to 5, characterized in that in conjunction with   guide plates (18a, 18b) are mounted on the lower ends of the side walls (11a, 11b) of the protection device, the internal sides of which guide parts (ia, 16b) directed upwards and connected to the bar lifting (14) of the traction hook (17) of the tractor, which parts block the traction hook (17) at   the rear of the locking rod (20) in the raised position.   7 A protective device according to claim 6, characterized in that in the guide plates (18 a, 1 Gb) consist of openings (21) or equivalent in which is rotatably arranged the locking rod <20) and in that said locking rod (20) is mounted by means of a locking lever (22) or the like so that it can be turned manually from the   tractor cabin to clear the blockage.   8 Protection device according to any one of   Claims 1 to 7, characterized in that the plates   lower (13 '), located between the side walls (lia, lib) of the protection device (10) and by which the protection device is partly fixed to the rear wall of the tractor frame, are arranged so that the parts marginal plates (13 ') serve as fixing means at the rear of which can be fixed the elastic protective cup (43) of the shaft (41) or PTO shafts (41, 42).   lu 9 Protective device according to claim 8, characterized in that said protective bowl (43) has a marginal shoulder (44) which is fixed between the   edges of the plates (13 ') of the protection device.   Protection device according to any one of   Claims 1 to 9, characterized in that on the parts   lower side walls (lia, llb) of the protection device and substantially outside of said walls (lia, llb) are mounted perforated plates (12 a, 12 b) whose perforations (28 a, 28 b) serve as fastening devices for members constituting lateral and internal limit stops for the drawbars of   three-point lifting means of the tractor.