FR3073834B1 - PORTABLE HANDAGE DEVICE - Google Patents

Abstract

The invention relates to a hoisting device (10) which comprises: - a bracket (20) comprising a mast (21) and an arm (22, 23) of load - or boom - retractable along the mast; - Deformable means (30) for reversible engagement of the mast with two bars of a ladder; - A device wearing member (40); and - a cross member (50) bearing on one of the bars, the carrying member and the cross member being integral with the mast.

Description

Portable hoisting device

TECHNICAL AREA

The present invention relates to a portable lifting device for a ladder, in particular a portable hoisting device for a fixed ladder, in particular for a crinoline ladder.

STATE OF THE ART

Many buildings and industrial facilities, including fuel-based electricity generation facilities, have fixed ("fixed") ladders to walls and allow operators to move around the facility or building, for example to carry out maintenance or control operations.

When these operations require the use of an object, for example a tool or measuring device, and no fixed means of hoisting is provided near a ladder, it may be necessary to an operator having climbed the ladder, to hoist the suspended object to a deformable link such as a rope, along the scale, or conversely to lower the suspended object to a deformable link, also along the 'ladder.

The hoisting and lowering of the object are all the more difficult as the object is bulky, heavy, and / or fragile, and it is frequent that no lifting device likely to facilitate these actions is integrated with the object. 'installation.

There is therefore a need for a hoisting device that can be easily transported and set up by an operator climbing a ladder.

Patent JPH11159270 discloses a spacer device for a movable ladder that can be secured to two adjacent bars of the ladder by fixed hooks and sliding hooks on which springs.

The body of the spacer device comprises a main portion comprising an assembly of tubes forming an "H" and arranged to extend along the scale, "under" the scale, ie. between the ladder and the wall of a building against which the ladder is supported by means of the spacer device.

The body of the device further comprises a bearing portion on the building wall, which forms an angle with the longitudinal axis of the scale and which comprises several bars.

This device is used with a hoist hooked to one of the bars and allowing an operator on the ground to hoist an air conditioning unit "under" the ladder, from the ground on which the ladder rests to a support previously attached to the wall against which the ladder is supported.

This device that extends between the ladder and the wall against which the scale is based, is not suitable for hoisting a load along a ladder rigidly attached to a wall.

This device is bulky, especially because of the rigid connection between the main portion shaped "H" and the support portion; therefore, it is not suitable for hoisting a load along a ladder equipped with a crinoline, inside the crinoline, and it is also not suitable to be worn by an operator climbing a ladder, especially a crinoline ladder.

This bulky device is also unsuitable to be secured to a ladder, and then detached from the ladder, by an operator located on the ladder.

This device does not allow an operator to respect the basic rules of safety that must be applied to climb a ladder and perform work at height, especially the rule requiring the operator to constantly have three points of support on the scale .

STATEMENT OF THE INVENTION

An object of the invention is to provide a portable hoisting device for a fixed scale, which remedies, in part at least, the shortcomings or disadvantages of known devices.

In particular, it is sought a portable device for hoisting a load along a fixed ladder, which is light, compact, safe to use, adaptable to different types of ladders in diameter and spacing bars, portable otherwise than by hand, which can be secured to the ladder quickly and with one hand, so as to allow an operator carrying the device to climb the ladder, to secure the device to scale, and continue its progression on scale, safely.

According to one aspect of the invention, there is provided a hoisting device which comprises a bracket comprising a mast and a load arm retractable along the mast, means of engagement (hanging) reversible mast with two bars of a ladder, a port member of the device, and a support beam on one of the bars, the port member and the cross member being integral with the mast.

The reversible engagement means of the mast with two bars of a ladder preferably comprise a first attachment member to a first ladder rung (which is hereinafter referred to as "upper rung"), which is attached to the mast of the ladder. preferably rigidly, and a second attachment member to a second ladder rung (which is hereinafter referred to as "lower rung" and is substantially parallel to the first ladder rung), which is movably mounted relative to the mast, of so that the reversible engagement means are adjustable (deformable), and the reversible engagement means comprise means for biasing the fastening members towards one another.

In other words and according to another aspect of the invention, there is provided a hoisting device which comprises: a mast having a longitudinal axis; - An arrow - or load arm - secured to the mast in the vicinity of a first longitudinal end (or top) of the mast; a device carrying member which is integral with the mast; - A support piece (on an upper bar) secured to the mast, which extends transversely (relative to the longitudinal axis), and which carries (or includes) a first attachment member (to the upper bar) s extending on either side of the mast, preferably substantially symmetrically with respect to the longitudinal axis; - A second attachment member (the lower bar) slidably mounted relative to the mast, in the vicinity of a second longitudinal end (or base) of the mast; - A return member of the second latching member to the first latching member; and wherein the boom is retractable along the mast, capable of passing from an expanded configuration in which the free end of the boom extends at a first distance from the longitudinal axis, to a retracted configuration in which the end free of the arrow extends to a second distance from the longitudinal axis which is less than the first distance.

Each of the attachment members may have a form of bent tongue, hook, or rider, the shape and dimensions of each attachment member being adapted / selected so that the member can overlap (or partially surround) a portion longitudinal scale bar, so as to hold the device in contact with the ladder bar. The invention makes it possible to have, when the boom is retracted, a compact device, slender and balanced shape, which can easily be grasped and manipulated with one hand by an operator standing on the ladder and grasping the device by the mast, both to engage on his shoulder than to release it from his shoulder, to secure it to two parallel bars by deformation (extension) reversible engagement means, and to separate the bars by manipulation reverse. The port member of the device may comprise or consist essentially of a first deformable link, of elongated shape, for example a strap or strip of textile material, the two ends of which are secured to the mast, preferably respectively in the vicinity of the two ends. of the mast.

The first deformable link can be elastic; alternatively, the length of the link may be greater than the distance between the two attachment points of the link to the mast, so that an operator can engage his arm between the mast and the link to suspend the device to his shoulder, the link forming a strap.

According to one embodiment, the extension of the reversible engagement means is accompanied by an elongation of a return member (such as a spring) of the biasing means. Alternatively, this extension is accompanied by compression of this return member. The extension of the reversible engagement means can be obtained, after the second attachment member has been engaged with the lower bar, by traction exerted by the operator on the mast, substantially along the longitudinal axis of the mast and towards the upper bar, with a sufficient traction force to overcome the restoring forces exerted by the biasing means and the frictional forces during sliding of the second fastening member along the mast. The intensity of this traction force can be in a range from about one Newton (IN) to about ten Newton (ION).

The device comprises a member or device for locking reversible engagement means, in particular a locking member preventing the sliding of the second fastening member along the mast, such as a cam clamping lever.

The retractable and deployable boom may comprise one or two articulated arms (s) on the mast, in particular one or two arms pivoting along one or two pivot axes which is (are) substantially perpendicular (s) to the longitudinal axis of the mast , in particular parallel (s) to the longitudinal axis of the support piece.

According to one embodiment, the boom comprises a pulling arm and a load arm. Alternatively, the boom may comprise a load arm and a deformable tie, such as a cable, which connects the load arm to the mast.

This allows to retract the boom by pivoting the (or) arm relative to the mast. For this purpose in particular, at least a portion of the mast may have, in cross section, a concavity oriented towards the (s) arm of the boom. This concave portion can thus receive a portion of the arm, in the retracted position of the boom, while ensuring the rigidity of the mast.

The device may comprise a mutually reversible fastener of the two arms of the boom, such as a pin, this fastener being secured to the device, in particular integral with the load arm, by a second deformable link such as a cablet.

The device may comprise a locking member of the mutually reversible fastener of the two arms, which may be integral with, in particular, integrated with the mutual attachment member of the arms, this locking member being for example constituted by a ball of a safety ball pin.

The device may further comprise a shackle fixed in the vicinity of the free end of the boom, and / or a carabiner for suspending a lifting pulley at the shackle and / or the boom, the pulley possibly comprising a brake for a cable or hoisting rope engaged in the pulley. The invention provides a compact hauling device, lightweight, and easy to wear on the shoulder. In particular, the dimensions of the parts of the hauling device and the materials chosen to achieve them can provide a device whose mass is less than 5 or 10 kilograms, the device for hoisting a load of several tens of kilograms.

A method of installing the device on a scale may include the following operations: - carry the device to the shoulder, on the front of the body; - climbing a ladder to the vicinity of a platform that can be provided near the top of the ladder; - Engage the mobile attachment member under a "lower" bar of the scale extending substantially at the size of the operator; - By holding the device with one hand by the mast, cause the extension of the reversible engagement means and engage the fixed fastening member on an "upper" bar of the scale, by folding the mast against the bar ; - lock the reversible engagement means; then, the operator standing on the platform: - deploy the gallows; - couple the load arm to the tie rod by the ball pin; and - suspend a lifting pulley from the load arm.

Conversely, a method of removing the device may comprise the following operations: separating the lifting pulley from the load arm; - Uncouple the load arm of the tie rod by extracting the ball pin, so that the load arm and the tie pivot and retract along the mast; then, the operator positioning himself on the ladder in front of the device: - put the wearing organ on the shoulder; - Unlock the reversible engagement means; - By holding the device with one hand by the mast, cause the extension of the reversible engagement means and then release the fixed attachment member of the "upper" bar of the scale, by removing the upper part of the mast. this bar; then - disengage the movable fastener from under the "lower" bar of the scale. Other aspects, features, and advantages of the invention appear in the following description which refers to the appended figures and illustrates, without any limiting character, embodiments of the invention.

BRIEF DESCRIPTION OF THE FIGURES

Figure 1 illustrates, in perspective view, a hoisting device whose boom is deployed. Figure 2 is a perspective view from another angle of the device shown in Figure 1.

Figure 3 illustrates, in side view, the hoisting device illustrated in Figures 1 and 2.

Each of Figures 1 to 3 further comprises, in the lower part of the figure, a cutaway illustrating an end position of the movable lower member hooking the device to a ladder bar.

Figure 4 illustrates, in side view, the device shown in Figure 3 in a retraction configuration of the boom obtained by inclining the arms of the arrow along the mast of the device.

FIG. 5 illustrates, in plan view, the device illustrated in FIG. 3 and is a view along V of FIG.

FIG. 6 schematically illustrates an operation of engagement of a lower fastening member of the hoisting device with a lower ladder rung, and FIG. 7 schematically illustrates a subsequent operation of engagement of an upper fastening member. and supporting the hoisting device with another bar extending above the lower bar.

FIG. 8 schematically illustrates an operation of hoisting an object using a hoisting device secured to the two upper bars of a "non-opening" ladder, ie whose summit extends at a platform on which an operator can stand, and FIG. 9 schematically illustrates an operation of hoisting an object using a hoisting device secured to two successive bars of 'an open ladder', ie whose summit extends over a platform on which can be held an operator.

DETAILED DESCRIPTION OF THE INVENTION

Unless otherwise explicitly or implicitly stated, elements or members - structurally or functionally identical or similar - are designated by identical reference numerals in the different figures.

With reference to FIGS. 1 to 9, the device 10 is used to hoist a load 104 (FIGS. 8 and 9), which is suspended from a deformable link such as a rope, along a fixed scale 102 comprising at least two bars 100 , 101 superimposed to which the device 10 is temporarily secured for this purpose.

The device 10 comprises a bracket 20 comprising a mast 21 extending along a longitudinal axis 70, and two arms 22, 23 articulated with respect to the mast and forming a retractable boom along the mast.

For hoisting a load, traction is performed by an operator on a rope (not shown) engaged in a pulley (not shown) suspended from the boom 22, 23. For this purpose the device may comprise, as illustrated in FIGS. at 3, a shackle 90 fixed near the free end of the boom, and a carabiner suspended from the shackle and supporting the hoisting pulley.

The pulley may include a brake for the hoisting rope engaged in the pulley.

In the embodiments illustrated in Figures 1 to 5, the mast 21 consists of a bar whose cross section has a shape of "U".

The upper arm 23, acting as a tie rod, is fixed to the upper end 74 of the mast 21, between the flanges of the U-shaped section 21, by a pivot pin 72 perpendicular to the axis 70.

The lower arm 22, serving as load arm and at the free end of which is fixed the shackle 90, is fixed at a distance from the upper end 74 of the mast 21, between the flanges of the U-shaped section 21, by a pivot pin. 71 axis parallel to the axis 72.

The arms 22, 23 may thus extend in part between the flanges of the U-shaped section 21, along this profile, when their respective free ends have been mutually separated, as illustrated in FIGS. 4, 6, and 7.

Each arm 22, 23 respectively comprises a yoke 26, 27 (see FIG. 4) pierced with a hole for the passage of a pin 80 with a ball (see FIG. 3 in particular) serving as a reversible mutual fastening member for the arms 22. , 23.

To deploy the boom, the operator pivots the arms 22, 23, from their retracted position along the mast to an extended position shown in FIGS. 1 to 3 and 5, in which position the orifices of the yokes 26, 27 are aligned. so that the operator can engage the pin 80 in these orifices.

To prevent the fall or loss of the pin when it is not engaged in the openings of the yokes, the pin is connected to one of the parts of the device by a deformable link 81 (see Figure 3); the pin is for example connected, by the link 81, to another clevis 28 provided on the arm 22.

To prevent the accidental release of the pin 80 from the yokes, the pin comprises a locking member formed by a ball.

The device 10 comprises a crosspiece 50 (see FIG. 2 in particular) for supporting and hooking on a ladder rung, which is fixed rigidly to the arm 21, in a substantially "central" portion of the mast, ie d. in an intermediate portion between the upper ends 74 and lower 75 of the mast.

The crosspiece 50 extends along a transverse axis 73 (with reference to the axis 70) which is parallel to the axes 71, 72 of pivoting arms.

The arms 22, 23 extend from one side of the mast 21, while the cross member 50 extends from a second side of the mast opposite the first side.

The crosspiece 50 comprises - and essentially consists of - three flat wings (see Figure 4 in particular) elongated along the axis 73: - a first flange 34 serves to fix (rigidly) the cross member 50 to the mast 21; a "central" wing 31, which forms a right angle with the wing 34 so as to extend in a plane perpendicular to the axis 70 of the mast; and - a third wing 32, which forms an obtuse angle with the flange 34, serves to retain the cross member 50 (and the device 10) engaged with the bar 100 as the cross rests on this bar. The central wing 31 can serve as a bearing surface on a bar 100 of upper scale, when the diameter of this bar is less than or equal to the width of the wing 31. In the opposite case, the crossbar 50 of support and hooking bears on the bar 100 by its two lateral wings 32 and 34.

The length of the crossbar 50 is greater than the width of the mast to ensure a stable support and attachment of the device on the bar 100.

As illustrated in FIG. 2, the central part of the attachment wing 32 is provided with a cutout 32a serving to reduce the mass of the crossmember. Consequently, the fastening flange 32 comprises two projecting tabs extending respectively at the two longitudinal ends of the crossmember 50, so that these attachment tabs extend on either side of the mast.

As shown in Figures 2 and 3 in particular, the cross member 50 has a jumper shape whose concavity is directed towards the lower end 75 of the mast.

The device 10 comprises a second attachment member 33 with a second bar 101 of scale parallel to the first scale bar 100, which is fixed rigidly to a blade 29 slidably mounted relative to the mast, between the wings of the mast and against the core of the mast, along the longitudinal axis 70 of the mast, in the vicinity of the lower end 75 of the mast, so that the fastening member 33 is movable (sliding) relative to the mast 21. L movable attachment member 33 extends opposite the cross member 50 and has an upwardly flared jumper shape, the concavity of which is directed towards the upper end 74 of the mast and towards the cross member 50.

As illustrated in FIGS. 2 to 4, the mobile attachment member 33 is formed of three flat wings parallel to the axis 73, and has a cross section identical to that of the crossmember 50.

The shape and dimensions of the crossmember 50 and the movable member 33 hooking are adapted so that each of these parts 33, 50 can partially surround a longitudinal portion of a ladder bar: the cross member 50 overlaps the portion upper of a longitudinal portion of the upper bar 100, and the movable member 33 hooking surrounds the lower portion of a longitudinal portion of the lower bar 101 (see Figures 3 and 7 to 9).

The flared shape of the crosspiece 50 and the movable member 33 hooking allows them to adapt to bars of different diameters by self-centering.

The device 10 also comprises a return member constituted by a spring 35 (see Figures 6 and 7), a first end is fixed to the blade 29 and a second end is fixed to the mast, so that the spring is biased in traction when the movable member 33 of attachment is spaced from the lower end 75 of the mast, as illustrated schematically in Figures 1 to 3 and 6.

The spring 35 serves to return the blade 29 and the member 33 towards the upper end of the mast, ie. to the crossing 50.

The spring 35 allows self-maintaining the device to scale when not locked.

In addition the spring 35 is also used to self adapt the support members and attachment (31 to 34) depending on the distance between the ladder bars.

The blade 29 is pierced with a longitudinal opening through which extends a rod fixed to the core of the mast and which is secured to a lever 24 to pivoting cam 36 which can press the blade 29.

The cam lever 24 serves to prevent, in a first configuration (orientation) of the lever, and conversely to allow in a second configuration (orientation) of the lever, the sliding of the blade 29 and the second member 33 hooking relative to the mast.

The cross member 50 and its supporting and hooking members 31, 32, 34 can be positioned eccentrically on the mat, ie. closer to the lower end 75 of the mast than the upper end 74, so that the boom of the device extends above the bearing 103 (or platform shown in Figures 8 and 9), especially when the ladder stops at the level of the bearing as illustrated in FIG 8, allowing the operator in charge to recover the object 104 and located on the bearing, to grasp the object more easily.

The device 10 further comprises a strap 40 for transporting the device (see FIG. 7), the two ends 41, 42 of which are secured to the mast, respectively in the vicinity of the two ends 74, 75 of the mast. Unless the strap 40 is elastic, its length is greater than the distance between its two points 41, 42 of attachment to the mast.

The device can be used as follows: an operator carrying the device 10 (whose arrow is retracted) to the shoulder (for example the left shoulder) by the strap 40 climbs a ladder to a determined height, the device being supported on the shoulder, between the operator and the ladder; - the operator standing with his hand not corresponding to the shoulder carrying the device (for example his right hand) tight / attached to a rung of the ladder, separates his opposite hand (his left hand) from the ladder , grasps the device by its mast, with one hand (of his left hand), keeping the strap on the shoulder in order to avoid an accidental fall of the device; the operator engages the mobile lower attachment member 33 of the device under a ladder bar 101 extending for example slightly above its belt, while maintaining (with its left hand) the inclined mast as illustrated in FIG. , i.e. whose upper end 74 extends at a distance from the rungs of the ladder, between the ladder and the torso of the operator; the operator then exerts (by his left hand) an upward vertical pull on the mast illustrated in FIG. 6 by the arrow 95, which is sufficient to cause the extension of the spring 35 and the sliding of the blade 29 and the member 33 lower attachment, relative to the mast, to the configuration shown in Figure 6 wherein the upper members 31, 32 of engagement extend above the bar 100 overhanging the bar 101 with which is engaged the organ 33; in this configuration, the plate operator (by his left hand), by a pivoting movement illustrated in FIG. 6 by the arrow 96, the mast against the ladder rungs, then releases his traction force (95) so that the engagement members 31, 32, 34 engage with the bar 100 and the cross member 50 bears on the bar; the operator can then release the mast of the device, slide the strap along its arm (left), and lock (by its left hand) the sliding of the blade 29 by acting on the cam lever 24; the operator can then continue his progression on the ladder to a platform near the top of the mast (and the ladder), then deploy the boom of the bracket, lock the mutual assembly of the arms 22, 23 by the ball pin, engage a carabiner bearing a pulley in the shackle hanging from the boom, and engage a lifting rope into the pulley.

A second operator at a lower level at the bottom of the ladder can then lift a load suspended from the lifting rope.

Once the load deposited on the platform, the operator can proceed, in reverse order to the previous one, the reverse operations to retract the boom, put the strap of the device to the shoulder, and then disengage the device from the ladder.

Claims (9)

claims 1 - Device (10) hoisting characterized in that it comprises: - a bracket (20) having a mast (21) and an arm (22, 23) load - or boom - retractable along the mast; means (30) for reversibly engaging the mast with two bars (100, 101) of a ladder; a member (24) for locking the reversible engagement means; an organ (40) for carrying the device at the shoulder; and - a support beam (50) on one of the bars, and in that the port member and the cross member are integral with the mast. 2 - Device according to claim 1 wherein the means (30) of reversible engagement of the mast with two bars of a ladder comprise a first member (31, 32, 34) for attachment to a first bar (100) of scale, which is fixed to the mast, a second member (33) for attachment to a second ladder bar (101) which is mounted to move relative to the mast, and means (35) for returning the members (31 to 34 ) hooking towards each other. 3 - Device according to claim 1 or 2 wherein: - the mast has a longitudinal axis (70); - The load arm - or boom - is secured to the mast in the vicinity of a first end (74) of the longitudinal mast; the support crosspiece (50) extends transversely (73) with respect to the longitudinal axis (70) and carries (or comprises) a first member (31, 32, 34) for attaching to a first bar Scale (100) which extends on either side of the mast, preferably substantially symmetrically with respect to the longitudinal axis (70); - The device comprises a second member (33) for attachment to a second bar (101) scale parallel to the first ladder bar, said second member (33) of attachment being slidably mounted relative to the mast, in the vicinity a second end (75) of the longitudinal mast; - The device comprises a member (35) for returning the second member (33) for hooking to the first member (31, 32, 34) of attachment; the retractable boom can pass from an expanded configuration in which the free end of the boom extends at a first distance from the longitudinal axis (70), to a retracted configuration in which the free end of the boom is extends at a second distance from the longitudinal axis (70) which is less than the first distance; the shape and dimensions of each member (31 to 34) of attachment being adapted so that the attachment member can overlap or partially surround a portion of a bar (100, 101) scale. 4 - Device according to any one of claims 1 to 3 wherein the member (40) port comprises- or consists essentially of - a first deformable link whose two ends are secured to the mast, preferably respectively in the vicinity of two ends (74, 75) of the mast, and whose length may be greater than the distance between the two attachment points of the link to the mast. 5 - Device according to any one of claims 2 to 4 wherein the locking member (24) is a locking member preventing the sliding of the second member (33) hooking, such as a cam clamping lever . 6 - Device according to any one of claims 1 to 5 wherein the bracket (20) comprises one or two arms (22, 23) hinged (s) on the mast (21), in particular one or two pivoting arm according to a or two axes (71, 72) of pivoting which is (are) substantially perpendicular (s) to the axis (70) of the longitudinal mast, in particular parallel (s) to the axis (73) of the longitudinal cross member (50) support and hooking. 7 - Device according to any one of claims 1 to 6 wherein at least a portion of the mast (21) has, in cross section, a concavity oriented towards the (s) arm (22, 23), at least a portion of the mast which may have a U-shaped cross section whose opening is oriented towards the arm (s) (22, 23). 8 - Device according to any one of claims 1 to 7 which comprises a member (80) for mutually reversible attachment of two arms (22, 23) of the boom, such as a pin, said fastener being secured to the device, in particular integral with the load arm (22), by a second deformable link (81) such as a cable. 9 - Device according to claim 8 which comprises a locking member of the member (80) for mutually reversible attachment of the arms, which is preferably secured to - in particular integrated with - the member (80) for mutual attachment of the arms .