FR2822482A1 - Accessory fitting and release system for contruction or demolition machine jib has extending/retracting axles operated by cranked hand tool - Google Patents

Abstract

The system consists of two or more axles (12) that can be extended to connect an accessory such as metal cutting shears (16) to the end of a jib on a self-propelled construction or demolition machine and retracted to release it, using a cranked hand tool (22). Each of the axles is operated by a screw (23) accessible from outside the jib and the accessory. In a variant, the axles can be extended and contracted mechanically. e.g. by a hydraulic power cylinder.

Description

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 The invention relates to a device for mounting a work accessory at the end of the boom of a self-propelled machine.

 The invention also relates to a work accessory intended to be mounted on a device according to the invention.

 In building and demolition work, many self-propelled machines can be used which can be equipped with working accessories to carry out a particular task. In particular, excavating machines are used comprising a boom and an end cylinder, intended to receive various working accessories. Thus, a hydraulic excavator can be fitted with shears intended for shearing steel beams, concrete crushers or crushers, heavy shears for logs and planks, or other heavy and mobile accessories for shearing or demolition. These heavy accessories generally comprise at least one movable jaw intended to cooperate with a fixed part or another movable jaw.

 In the case of at least one movable jaw, this movable jaw is pivotally mounted about a main articulation axis having a large section. The change of jaw for maintenance or replacement of the accessory currently requires the disassembly of this main axis of articulation, which has a significant weight, requiring the intervention of at least two people. During the maintenance intervention or the replacement of the accessory, the disassembled axis must be removed from the work area, which presents risks of deterioration, pollution, loss of this main axis of articulation. Also, during reassembly, the main articulation axis and the corresponding bore may suffer deterioration, due to the difficulty of the corresponding manipulations.

 These drawbacks arise in the case of independent jaws capable of being separated by the removal of the main axis of articulation, and also in the case of jaws connected by a sleeve or a ring concentric to the main axis of articulation, remaining integral with each other after removal of this main axis of articulation.

 An object of the invention is to remedy the drawbacks of the known technique, by providing a new device allowing rapid positioning

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 and precise of an accessory at the boom end of an excavating machine or other self-propelled machine.

 Another object of the invention is to avoid the loss or damage of a part or an accessory during the various assembly, disassembly and storage operations of a series of accessories adaptable to a machine. self-propelled such as an excavator.

 Another object of the invention is to allow rapid and secure attachment of an accessory, in a precise and ergonomic manner, requiring only the intervention of a single operator.

 Another object of the invention is to protect the joints and mounting surfaces against external pollution.

 The subject of the invention is a device for mounting a work accessory at the end of a boom of a self-propelled machine, the device comprising a part for connection to said boom and a part for mounting the work accessory, the part for mounting a the working accessory comprising at least one actuating cylinder for the working accessory and mechanical mounting means for the working accessory, characterized in that the mechanical mounting means comprise at least two axes which can be retracted between a position accessory release corresponding to the approximation of the axes and an attachment securing position corresponding to the spacing of the axes, so as to leave the axes in place on the device during assembly and disassembly of separate working accessories.

 According to other alternative characteristics of the invention: - the mechanical mounting means comprise four retractable axes between a close position for releasing an accessory and a distant position for securing an accessory, - the retractable axes are associated with members for maneuvering their movement, each retractable axis movement maneuvering member can be a screw accessible from the outside of the device and from the outside of an accessory mounted on the device,

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 - The device comprises stop and accessory positioning means, so as to position the accessory in a position close to its position for securing to the device before proceeding with the separation of the axes of the device to ensure the securing of the accessory to the device, the stop and positioning means comprise at least one positioning axis and at least one planar contact stop, the device comprises at least one accessory engagement chamfer, according to an advantageous variant, at least one retractable axis displacement actuating member is a member controllable by a power source, for example a hydraulic cylinder.

 The invention also relates to a working accessory intended to be mounted on a device according to the invention, comprising a mounting head comprising at least two bores intended to cooperate with the retractable axes of the device and means for stopping the 'spacing of said retractable axes of the device.

 Advantageously, a work accessory according to the invention further comprises stop and positioning means relative to the device, so as to position the accessory in a position close to its position for securing to the device.

 The invention will be better understood thanks to the description which follows given by way of nonlimiting example with reference to the accompanying drawings in which: - Figure 1 schematically shows an exploded perspective view of a device according to the invention, d an accessory according to the invention and an accessory support.

 - Figure 2 schematically shows a side elevation view similar to Figure 1 of a device according to the invention, an accessory according to the invention and an accessory support.

 FIG. 3 schematically represents a view in section along the broken line 111-111 of FIG. 2.

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 - Figures 4 to 7 show schematically in elevation the association of a device according to the invention with accessories according to the invention of different types.

 With reference to Figures 1 to 3, identical or functionally equivalent elements are identified by identical reference numerals.

 In FIG. 1, a device 1 according to the invention is shown above an accessory 2 of the shear type, itself represented above a chassis 3 for supporting the accessory 2.

 The device 1 comprises an upper part 4 and a lower part 5. The first part or upper part 4 is a part for connection to a boom of a self-propelled machine not shown and comprises in a manner known per se two passages 6 and 7 for mounting 'axes of attachment to the boom and to the main boom cylinder of the self-propelled machine not shown. The lower part 5 can be mounted with the possibility of rotation relative to the upper part 4, in a manner known per se. For this purpose, the upper part 4 may contain a hydraulic motor for driving in rotation about the vertical main axis of the device. In this case, the actuating cylinders 8 and 9 of the working accessory are preferably supplied by means of rotary hydraulic seals.

 The jacks 8 and 9 are mounted on the device 1 by means of axes 8a and 9a and have a lower end in the form of yokes 8b, 9b intended to cooperate with corresponding parts of an accessory 2.

 The device 1 comprises stop means 10, at least one positioning means II and at least two axes 12 retractable between an accessory release position corresponding to the approximation of the axes in the retracted position and an accessory securing position corresponding to the spacing of the axes in the extended position.

 The accessory 2 comprises a mounting head 13 supporting a main axis of articulation 14 of two jaws 15 and 16. Each jaw 15 or 16 has a projection 15a or 16a allowing the mounting of the corresponding axis of a jack 8 or 9. To this end, the protrusion 15a has a passage for the clevis pin 8b, while the protrusion 16a has a passage for the clevis pin 9b.

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 The mounting head 13 comprises at least two bores 17, 18. Each bore 17 or 18 is associated with a means for stopping the spacing of a retractable axis 12, for example a cap 17a or 18a drilled to allow passage a member for controlling the spacing of the retractable axes 12 of the device 1.

 The support 3 has a conformation adapted to a stable maintenance of an accessory 2 when the latter is detached from a corresponding device.

 In FIGS. 2 and 3, the retractable axes 12 are mounted in pairs, so that the output of the axes 12 in the direction of the arrows corresponding to the spacing of the axes 12 is controlled by a member for operating the movement of the axes 12.

 As an operating member, a screw 23 can be used which is capable of being actuated by a crank 22, to cause the axes 12 to exit inside the bores 17, 18 until they come into abutment against the internal stop surface d 'a hat 17a or 18a. Those skilled in the art will provide for this purpose that the passage of a cap 17a or 18a has a diameter greater than the diameter of a crank head 22.

 It is also advantageously possible to provide a maneuver for moving retractable axes 12 controllable by a source of energy, for example a source of hydraulic energy. To this end, a pair of axes 12 can be made from a double-acting hydraulic cylinder, capable of moving the axes 12 between an extended position corresponding to their spacing and a retracted position corresponding to their approximation. This variant, not shown, does not depart from the scope of the present invention.

 Before any maneuver of the axes 12, it is necessary to position the accessory 2 in a position close to its position of attachment to the device 1. To this end, the device 1 is moved by the self-propelled machine not shown in a position corresponding to the cooperation of the stops 10 of the device 1 and the stops 20 of the accessory 2, the centering being effected by cooperation of the axis 11 of positioning of the device 1 with notches of cooperating shapes 21 made in the mounting head 13.

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 Thanks to these provisions, the invention allows rapid assembly and disassembly of an accessory relative to a device, without loss of articulation axis and without pollution or damage to the mechanical fixing means.

 To mount an accessory 2 previously positioned on a support 3 holding the jaws 16 and 15 in a stable position, an operator moves a device 1 using a self-propelled machine not shown and vertically descends the device 1 in the direction of the accessory until the positioning axis 11 is matched with the corresponding notch 21 of the accessory 2. After this matching, the operator proceeds to slowly lower the device until contact with the stops 10 of the device with the stops 20 of the accessory.

 In this position, the accessory is positioned relative to the device 1 in a position close to its securing position. The operator can then actuate the axes 12 using the crank 22 to move them apart and engage them in the bores 18 and 17 of the mounting head 13. The action of the crank 22 on the maneuvering screw 23 causes the spacing of the axes 12 and their engagement in the bearings 18 and 17 until a contact stop on the inner face of the caps 17a and 18a. This stop corresponds to a complete engagement of the axes 12 in the bores 17 and 18 and to a secure connection of the device 1 and the accessory 2.

 After mounting the axes connecting the actuating cylinders 8 and 9 to the protuberances 15a and 16a of the jaws 15 and 16, the assembly is ready to be used for the work for which the accessory is intended.

 For the dismantling of an accessory, an operator will proceed in the opposite direction, by positioning the accessory on a support 3, by detaching the jacks 8 and 9 from the protuberances 15a and 16a of said jaws 15 and 16, by acting on the maneuvering screw. 23 via the crank 22 to retract the pins 12 inside their housings outside the bores 17 and 18 of the accessory 2. This retraction then allows the release of the device 1 remained integral with the self-propelled machine.

 Advantageously, provision is made on the lower edge of the device for engagement and disengagement chamfers 30 to facilitate the insertion and disengagement of the

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 corresponding part of the device 1 between the bores 17 and 18 of the mounting head 13.

 Figures 4 to 6 show the different possibilities of mounting an accessory on a device according to the invention.

 A device 1 can be adapted to a shear for demolishing concrete structures shown in FIG. 4.

 A device 1 can be adapted to a demolition crusher for concrete objects shown in FIG. 5.

 A device 1 according to the invention can be adapted to a shear for steel elements or for scrap shown in FIG. 6.

 A device 1 according to the invention can be adapted to the mounting of a universal combined accessory allowing the demolition of elements containing at the same time scrap, steel or concrete elements, represented in FIG. 7.

 The common point of the accessories represented in FIGS. 4 to 7 is to include a mounting head 13 similar or functionally equivalent to the mounting heads shown with reference to FIGS. 1 to 3.

 In all cases, the invention allows rapid assembly and disassembly of the accessory, avoiding removing the main articulation axis 14 of significant weight and allowing the assembly and disassembly in a rapid and ergonomic manner, does not requiring the intervention of only one operator.

 The retractable axes 12 remain constantly prisoners of the device 1, which avoids any loss, pollution or damage to the axes 12. The abutment and positioning means provided on the mounting heads and the device 1 also prevent any damage or pollution of the axes 12 when a device 1 and a corresponding accessory are joined together.

 The only tool required, in the case of an actuator with manual actuation, is a tool of the crank type, wrench or the like.

 In the advantageous case of a remotely controlled operating member, such as a hydraulic cylinder, no tool is necessary for mounting and dismounting an accessory on the device 1 according to the invention.

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 The invention described with reference to several particular embodiments is in no way limited thereto, but on the contrary covers any modification of form and any variant embodiment within the scope and spirit of the invention.

Claims (10)

CLAIMS 1. Device for mounting a work accessory at the end of a boom of a self-propelled machine, the device comprising a part (4) for connection to said boom and a part (5) for mounting the work accessory (2), the part (5) for mounting the work accessory (2) comprising at least one actuating cylinder (8 or 9) for the work accessory (2) and means for mechanically mounting the work accessory , characterized in that the mechanical mounting means comprise at least two axes (12) retractable between an accessory release position (2) corresponding to the approximation of the axes (12) and a corresponding accessory attachment position (2) at the spacing of the axes (12), so as to leave the axes (12) in place on the device during assembly and disassembly of accessories (2) separate work.  2. Device according to claim 1, characterized in that the mechanical mounting means comprise four axes (12) retractable between a close position of accessory release (2) and a remote position for securing an accessory (2).  3. Device according to claim 1 or claim 2, characterized in that the retractable axes (12) are associated with members (23) for operating their movement.  4. Device according to claim 3, characterized in that each member (23) for maneuvering the movement of a retractable axis is a screw (23) accessible from the outside of the device and from the outside of an accessory mounted on the device.  5. Device according to any one of the preceding claims, characterized in that the device comprises means (10, 11) for stopping and positioning the accessory (2), so as to position the accessory (2) in a position close to its position of attachment to the device before proceeding with the spacing of the pins (12) of the device to ensure the attachment of the accessory (2) to the device.  6. Device according to claim 5, characterized in that the stop means (10) and positioning (11) comprise at least one axis (11) for positioning and at least one stop (10) of planar contact. <Desc / Clms Page number 10>  7. Device according to any one of the preceding claims, characterized in that the device comprises at least one chamfer (30) of accessory engagement (2).  8. Device according to claim 3, characterized in that at least one maneuvering member for retractable axis movement (12) is a member controllable by a power source, for example a hydraulic cylinder.  9. Work accessory intended to be mounted on a device according to any one of the preceding claims, comprising a mounting head (13) comprising at least two bores (17,18) intended to cooperate with said retractable axes (12) and means for stopping (17a, 18a) the spacing of said retractable axes (12).  10. Work accessory according to claim 9, further comprising means (20,21) for abutment and positioning relative to the device, so as to position the accessory (2) in a position close to its position of attachment to the device.