EP0132205A1 - Apparatus for raising masts - Google Patents

Abstract

The invention relates to pole lifting devices such as wooden electric poles, of the hoist type comprising a mast provided with cables secured to its upper part, intended for its guying and for the attachment of the pole to be lifted. The device is characterized in that the mast (1) is telescopic and also comprises fixing means (15) for a lifting winch (2) for the posts and a removable carriage (3) movable along the mast and provided with fixing means for a concrete breaker.

Description

The present invention relates to pole lifting devices such as wooden electric poles, of the hoist type comprising a mast provided with cables secured to its upper part, intended for its guying and for the attachment of the pole to be lifted.

Known lifting devices include a wooden mast and are very heavy and difficult to supply. In addition, they require the possession of a separate device for driving earth stakes.

The invention aims to remedy these drawbacks, and to create a simple and economical lifting device, easy to use, not requiring a large workforce, and which can be implemented quickly even in places hardly accessible.

To this end, the invention relates to a device for lifting poles of the hoist type comprising a mast provided with cables secured to its upper part, device characterized in that the mast is telescopic and also comprises fixing means for a lifting winch. for posts and a removable carriage movable along the mast and provided with fixing means for a concrete breaker.

Thanks to its telescopic design, the mast can be easily transported for example on a ladder rack, while allowing the lifting of wooden posts having a relatively large height; thanks to the mobile carriage, allowing the attachment of a concrete breaker, it is possible to quickly drive in the ground stakes without separate equipment.

According to a characteristic of the invention, the mast is made of light metal such as aluminum or an aluminum alloy, which allows its operation, and in particular its lifting, at most by two people.

• - la figure 1 est une vue de l'ensemble d'un dispositif selon l'invention ;
• - la figure 2 est une vue du pied du mât du dispositif de la figure 1 ;
• - la figure 3 est une vue partielle du mât du dispositif de la figure 1 ;
• - la figure 4 est une vue de face du montage d'une potence équipant le dispositif de la figure 1 ;
• - la figure 5. est une vue de dessus de la potence de la figure 4 ;
• - la figure 6 est une vue de face d'un chariot équipant le dispositif de la figure 1, représenté en position fermée ;
• - la figure 7 est une vue de dessus du chariot de la figure 6, mais représenté en position ouverte autour du màt ;
• - la figure 8 est une vue de face d'une chape de suspension équipant le dispositif de la figure 1 ;
• - la figure 9 est une vue de profil de la chape de la figure 8 ;
• - la figure 10 montre l'utilisation du dispositif selon l'invention en coopération avec une tarière à main ;
• - la figure 11 montre l'utilisation du dispositif selon l'invention en coopération avec un brise-béton.

Other characteristics and advantages of the invention will emerge from the description which follows, relating to a preferred embodiment given by way of nonlimiting example and represented in the attached drawings in which :

• - Figure 1 is a view of the assembly of a device according to the invention;
• - Figure 2 is a view of the foot of the mast of the device of Figure 1;
• - Figure 3 is a partial view of the mast of the device of Figure 1;
• - Figure 4 is a front view of the mounting of a bracket fitted to the device of Figure 1;
• - Figure 5. is a top view of the bracket of Figure 4;
• - Figure 6 is a front view of a carriage fitted to the device of Figure 1, shown in the closed position;
• - Figure 7 is a top view of the carriage of Figure 6, but shown in the open position around the mast;
• - Figure 8 is a front view of a suspension yoke fitted to the device of Figure 1;
• - Figure 9 is a side view of the yoke of Figure 8;
• - Figure 10 shows the use of the device according to the invention in cooperation with a hand auger;
• - Figure 11 shows the use of the device according to the invention in cooperation with a concrete breaker.

The device according to the invention comprises (FIG. 1) a mast 1 provided at the lower part of its body 10 with a foot 11 intended to rest on the ground, and at its top with a bracket 12 for hanging cables, at namely three shrouds 13 intended to be anchored to the ground by constituting the edges of a tetrahedron, and a support cable 14 having functions which will be described later. A winch 2 is fixed to the mast 1 by a fixing member 15 carried by the mast near its base 11. A removable carriage 3 is provided to be mounted so that it can slide along the mast. This carriage 3, when mounted, is hooked to the support cable 14 by means of a hook 16 fixed to a yoke 17.

The foot 11 comprises (FIG. 2) a horizontal base constituted by two sections 111 resting on the ground, having a U-shaped section, and arranged back to back, braced in the middle by the base of the mast and at their ends by the lower end of a respective inclined strut 112 whose upper end is fixed to the mast a few tens of centimeters from the base of it.

The body 10 of the mast 1 is constituted (FIG. 3) in two parts of cylindrical section sliding longitudinally one inside the other, more precisely an upper part 100 sliding inside a tubular lower part 101; the immobilization of the body 10 in its retracted position or in its deployed position can be obtained by pinned pins, introduced into transverse holes 102, 103 provided for this purpose in appropriate locations of the upper 100 and lower 101 parts respectively.

With a view to fixing the bracket 12, the top of the upper part 100 of the body of the mast comprises a yoke between the branches 104 from which this bracket is inserted and fixed,

The bracket 12 (Figures 4 and 5) inserted in the middle between the branches of the yoke, consists of two flanges 120 joined by two axes 121 arranged laterally on either side of the yoke from the top of the body 10 of the mast 1 , these two axes 121 supporting two respective idler pulleys 122 themselves inserted between the flanges 120. The flanges 120 are pierced with fixing holes 123, and each provided with an external fixing lug 124 intended for anchoring the shrouds 13 and the support cable 14 (the legs 124 being provided for this purpose with an ovalized eye).

The fixing member 15 for the winch 2 is constituted (FIGS. 2 and 7) by a sole 150 parallel to the longitudinal axis of the mast and itself fixed to the lower part 101 of the body of this mast by a rib 151 s extending radially with respect to the cross section of the mast, in a plane which is also vertical when the mast is itself vertical. The winch is a known device either, which is fixed to the sole 150 for example by screwing or bolting in holes provided for this purpose in this sole.

The carriage 3 (Figures 6 and 7) surrounds the mast and, in view to give it easy removable, it is provided in two parts 31, 32 articulated by hinges 33 with an axis of rotation parallel to the longitudinal axis of the mast. In operation, the carriage is in the closed position (Figure 6), while it is open (Figure 7) during assembly and disassembly (the closed position is shown in broken lines in Figure 7).

The carriage 3 comprises two groups of four rollers 34 intended to roll at the periphery of the mast body; the two groups of four rollers 34 are arranged one above the other in an identical manner (rollers one above the other, two by two): the rollers of each group are distributed at 90 degrees around the post so that their axes of rotation are in the same transverse plane relative to the body 10 and determine a square around the body; these rollers 34 are each housed between the wings of a yoke 35, or, more exactly, each pair of two rollers 34 belonging one to the upper group and the other to the lower group, are housed between the wings of a single clevis 35 having a height of several decimetres. Three of the yokes 35 are carried by one of the parts 31, and the fourth by the other part 32. The three yokes 35 carried by the same part 31 are therefore arranged, when the carriage is considered in cross section, at the three vertices of an isosceles right triangle whose sides of the right angle consist of transverse bars connecting the yokes, connecting the yoke which is at the top of the right angle to the other two, at the level of each of the two groups casters; for each of the two groups of rollers and bars, an additional bar 37 in L starts from one of the yokes 35 (the same yoke for the two groups), one of the branches of the L being parallel to the bar connecting the two other yokes, and the other branch of the L being perpendicular to the first and projecting outwards from the carriage; it is the free end of this second branch of each L-shaped bar 37 which carries the first element of the hinge 33 articulating the two parts 31, 32 of the carriage.

The single yoke 35 carried by the second part 32 of the carriage and intended to accommodate the two rollers of this second part, is itself connected by two L-shaped bars 38, identical to that which has been described, and each arranged at the level a group of rollers and bars, at the first part 31, via the second element of the hinge 33 (cooperating with the first).

In order to consolidate the connection of the yokes to the bars, each region of connection of a yoke wing 35 to a bar 36, 37, 38 is provided with a rib 39 extending in the transverse plane of the carriage.

In order to improve the longitudinal guidance of the carriage along the body of the mast, the latter is provided (FIG. 7 only) with an outer rib 105 extending radially and longitudinally along the body 10, cooperating with slides provided at inside the carriage 3 and in which it is engaged; these slides are formed by the space between two ribs 361 arranged perpendicularly in protrusion towards the inside of one of the bars 36 of each group and extending in the direction of movement of the carriage.

The branches opposite the L-shaped bars 38 belonging respectively to the first and to the second parts of the carriage 3 are drilled in order to receive a pin for holding the carriage in the closed position or a fixing bolt for connection lugs of the breaker. concrete, as will be seen later.

The suspension yoke 17 is made up (FIGS. 8 and 9) of two parallel plates 170 connected by an axis 171 carrying an idler pulley 172; these plates are pierced with holes 173 for fixing a suspension hook 16 (Figures 10 and 11).

The shrouds 13 are anchored, for two of them, each in an eye provided in a tab 124 of the bracket 12, and, for the third, in two opposite holes 123 also produced in this bracket.

The support cable 14 is anchored at one of its ends also in two holes 123 opposite in the bracket 12, and fixed at its other end to the winch 2 around which it is intended to be wound. Between these ends, a strand of the cable 14 leaves the winch 2 in the direction of the bracket 12, on which the cable is guided around the pulleys 122, then the cable leaves in the direction of the suspension yoke 17 of the hook, bypasses the pulley 172 of it, and its end strand again leaves in the direction of the bracket 12 to which it is anchored as it was at the highest.

When lifting poles, there is no need to adapt its movable removable carriage to the mast.

The same is true for digging the soil using a hand auger.

On the other hand, the presence of the trolley is useful for driving earth stakes using a concrete breaker.

In practice, the embodiment described corresponds to a device intended for lifting 12-meter wooden poles. To this end, in the deployed position, it has a length of 6.5 meters, the lower part inside which slides the upper part having a length of about 4.5 meters. The folded mast therefore has a length of 4.5 meters. It is made of aluminum or aluminum alloy, which gives it a low mass (51 kilograms), which allows it to be handled by only two people.

Thanks to its small size, when folded, the device can be transported on a ladder holder placed on the roof of a motor vehicle, carriage removed.

The raising of the mast on the site is carried out in its deployed position by exerting on the one hand a traction on one of the shrouds and by supporting on the other hand the mast while progressing from its top towards its base progressively its approach to the vertical position, which requires the presence of only two people. When the mast reaches the vertical position, the lower end of the shrouds is anchored in the ground.

For digging the ground using a hand auger 4 (Figure 10), simply hang the suspension ring 41 thereof on the hook 16, and in normal work, two operators are sufficient for operation, once the auger has been brought to the appropriate level by operating the winch 2.

For the lifting of a pole, it suffices to approach one end of it of the device, and, after having fixed the hook 16 to the pole, that one of the operators actuates the winch so as to raise one of the ends of this post while the other operator guides the post through the hole previously dug in the ground.

To drive a ground stake, it is necessary to adapt the carriage 3 around the mast 1. For this, the carriage 3 is put in the open position and the casters of its fixed part are arranged around the mast, then the carriage is closed and its movable rollers are also brought into contact with it; while the carriage is supported by one of the operators, the other proceeds to lock the carriage and fix the concrete breaker 5 (FIG. 11) by means of connection lugs 51 comprising a passage hole for the hook 16 , which is threaded through this hole. A hammer 52 fixed to the carriage and the concrete breaker serves as a counterweight. Under these conditions, the operation of the winch allows the carriage 3 to slide. In the present case, the lower part 101 of the body 10 is arranged to allow the carriage to be raised to a height of approximately 3.50 m.

Of course, the invention is not limited to the embodiment described above and shown, and we can provide other embodiments without departing from its scope.

Claims (8)

1. Device for lifting poles of the hoist type comprising a mast provided with cables secured to its upper part, device characterized in that the mast (1) is telescopic and also comprises fixing means (15) for a lifting winch ( 2) for the posts and a removable carriage (3) movable along the mast and provided with fixing means (38,51) for a concrete breaker (5). 2. Device according to claim 1, characterized in that the carriage (3) is in two parts (31, 32) intended to be arranged so that said carriage (3) surrounds the mast (1). 3. Device according to any one of claims 1 and 2, characterized in that the carriage (3) is in two parts (31, 32) articulated by at least one hinge (33). 4. Device according to any one of claims 1 to 3, characterized in that the carriage (3) has internal rollers (34) intended to roll along the periphery of the mast (1). 5. Device according to any one of claims 1 to 4, characterized in that the carriage (3) is in two parts (31, 32) comprising one of two groups of three rollers (34) arranged at the tops of a isosceles right triangle, and the other two casters (34). 6. Device according to any one of claims 1 to 5, characterized in that the fixing means (15) for a lifting winch (2) consist of a sole (150) connected to the mast (1) by a rib (151). 7. Device according to any one of claims 1 to 6, characterized in that it comprises at its top a bracket (12) for anchoring cables (13, 14), provided with two pulleys (122) for the guide of a support cable (14). 8. Device according to any one of claims 1 to 7, characterized in that it is at least partially made of a light metal such as aluminum and its alloys.

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