JP5249124B2 - Stretchable cylindrical cover assembly for work equipment - Google Patents

Description

The present invention relates to a cylindrical cover structure that can be expanded and contracted to cover a working device part that performs expansion and contraction of a working machine.

  A working machine such as an aerial work platform is provided with a working device portion that is expanded and contracted by a hydraulic cylinder or the like, and includes a cover for covering the working device portion as necessary. Patent Document 1 describes a cover that covers the entire upper surface of a rod of a dibutyl cylinder that tilts and drives a jib that is tiltably mounted on the tip of a telescopic boom of a crane vehicle.

    Japanese Patent Application Laid-Open No. H10-228561 describes a protective cover body that is a carriage that transports a heavy object and covers the lifting mechanism and expands and contracts in accordance with the lifting and lowering.

JP 2001-233585 A JP2002-220057

    However, since the cover of Patent Document 1 covers only the upper surface of the rod of the tilt cylinder, it does not have a protective effect in directions other than the upper surface. Therefore, it is not suitable for a working device portion that requires sufficient protection.

    On the other hand, the protective cover body of Patent Document 2 has a higher cover effect than that of Patent Document 1 in that it covers the entire lifting mechanism. The protective cover body has a telescope structure including an upper protective cover 4a, an intermediate protective cover 4b, and a lower protective cover 4c. The upper protective cover and the lower protective cover are fixed to both ends of the lifting mechanism, and the middle protective cover is slidably attached to the upper protective cover and the lower protective cover.

    However, since the middle protective cover 4b constituting the protective cover body of Patent Document 2 has an integral structure, it is difficult to attach the middle protective cover 4b after assembling the lifting mechanism. Therefore, it is necessary to attach the middle protective cover 4b at the same time when assembling the lifting mechanism. Furthermore, since the assembly has to be done while considering the whole procedure, the work is complicated and the efficiency is poor.

    Therefore, the present invention covers the entire periphery of the working device part, but can be attached after the working device part is assembled. An object is to provide a covering cylindrical cover assembly.

A cylindrical cover assembly according to a first aspect of the present invention is an expandable / contractable cylindrical cover assembly that covers a work device portion that performs expansion / contraction operation of a work machine, wherein the medium cross-section cover is fitted into the large cross-section cover. When the small cross-section cover is inserted into and extended, a radially inward flange at the end of the large cross-section cover on the medium cross-section cover side and a radially outward flange at the end of the medium cross-section cover on the large cross-section cover side And a radially inward flange at the end of the small cross-section cover on the small cross-section cover side and a radially outward flange at the end of the small cross-section cover on the medium cross-section cover side Accordingly, in the cylindrical cover assembly in which the large cross-section cover, the medium cross-section cover, and the small cross-section cover are integrated with each other and can be expanded and contracted, the pair of covers in which the medium cross-section cover is formed in half in the longitudinal direction Element Each of the longitudinal ends of the cover member is provided with longitudinal outward flanges, and the longitudinal outward flanges of the pair of cover members are joined to each other. The cylindrical cover assembly according to the second aspect of the invention, wherein the radially inward flange includes a notch portion into which a longitudinally outward flange of the cover member protruding from the outer periphery of the middle cross-section cover is fitted. In the first aspect of the present invention, the solid body is characterized in that the cross-sectional shapes of the large cross-section cover, the medium cross-section cover, and the small cross-section cover are circular.

    According to a third aspect of the present invention, there is provided a cylindrical cover assembly according to the first aspect, wherein the intermediate cross-section cover is formed by inserting a plurality of intermediate cross-section covers having different cross-sectional dimensions.

    In the first aspect of the invention, since the middle cross-section cover is composed of a pair of cover members formed in half in the longitudinal direction, the middle cross-section cover can be attached after the assembly of the working device is completed. In addition, since the longitudinally outward flanges are provided at both end portions in the longitudinal direction of the cover member and the longitudinally outward flanges of the pair of cover members are joined to each other, an easily integrated tube Can be assembled as a cover. Furthermore, since the radially inward flange of the large cross-section cover includes a notch portion into which the longitudinal outward flange of the cover member protruding to the outer periphery of the medium cross-section cover is fitted, the large cross-section cover It is possible to avoid interference between the inward flange in the radial direction and the outward flange in the longitudinal direction of the cover member protruding to the outer periphery of the middle cross-section cover.

    In the second invention, since the cross-sectional shape of the cross-sectional cover is circular, the cylindrical cover can be made of a pipe material that is easily available, so that no cost is required. In addition, since the cross section is circular, the middle cross section cover that is not directly fixed to the working device portion can freely rotate about its central axis with respect to the large cross section cover, but the radial inward flange of the large cross section cover The notch part and the longitudinal flange of the cover member projecting to the outer periphery of the medium cross-section cover act to exert a detent effect.

    In the third aspect of the invention, the portion corresponding to the intermediate cross-section cover is composed of a plurality of intermediate-section cross-section covers having different cross-sectional dimensions, so that a four-stage or more cylindrical cover assembly is formed. can do. For this reason, since the longitudinal dimension of the cylindrical cover assembly when fully reduced can be made shorter than that of the three-stage structure, the degree of freedom in designing the working device portion can be increased.

It is a cross-sectional perspective view of the cylindrical cover assembly of this invention. It is an AA arrow line view of FIG. It is a side view of an aerial work vehicle provided with a winch lifting device to which the tubular cover assembly of the present invention is applied. It is an enlarged view of the upper part containing the winch raising / lowering apparatus in FIG. It is an expanded sectional view of the winch raising / lowering device part of the state of FIG. It is a state change figure when raising a winch from the state of FIG. It is an expanded sectional view of the winch raising / lowering device part of the state of FIG. FIG. 8 is a partial detail view of the BB cross section of FIG. 7.

  FIG. 1 which is a cross-sectional perspective view of the cylindrical cover assembly of the present invention shows its basic configuration. The cylindrical cover assembly 50 is configured by inserting a medium cross-section cover 53 into a large cross-section cover 52 and inserting a small cross-section cover 51 into the medium cross-section cover 53. The cross sections of the large cross section cover 52, the medium cross section cover 53, and the small cross section cover 51 are circular. Therefore, since a highly commercially available pipe material can be used as the material, the cost can be reduced. In addition, the cross-sectional shape of the cover may be anything as long as it is cylindrical, and other than a circle, a triangle, a quadrangle, or a polygon more than that is applicable.

    Based on FIG. 1 and FIG. 2 which is an AA arrow view of FIG. 1, the whole structure of the cylindrical cover assembly 50 of this invention is demonstrated. Reference numeral 52 a denotes a radially inward flange at the end of the large cross-section cover 52 on the medium cross-section cover side. 53a is a radially outward flange at the end of the middle cross section cover 53 on the large cross section cover side. When the cylindrical cover assembly 50 extends, the radially inward flange 52a of the large cross section cover 52 and the radially outward flange 53a of the medium cross section cover 53 engage with each other, so that the large cross section cover 52 and the medium cross section cover 53 are engaged. And extend together.

    Similarly, 61 is a radially inward flange at the end of the middle cross section cover 53 on the small cross section cover side. Reference numeral 63 denotes a radially outward flange at the end of the small cross-section cover 51 on the medium cross-section cover side. When the cylindrical cover assembly 50 is extended, the intermediate cross-section cover 53 and the small cross-section cover 51 are engaged with the radially inward flange 61 of the medium cross-section cover 53 and the radial outward flange 63 of the small cross-section cover 51. And extend together. It should be noted that by using gravity, the cylindrical cover assembly of the present application can be reduced.

    The mid-section cover 53 is composed of a pair of cover members 60 formed in half in the longitudinal direction. Longitudinal outward flanges 62 are provided at both longitudinal ends of the cover member 60. The longitudinally outward flange 62 has an elongated strip shape, and the entire length thereof is substantially the same as the longitudinal dimension of the intermediate cross-section cover 53.

    As shown in FIG. 2, the cover member 60 has a semicircular cross-sectional shape, and the longitudinal outward flanges 62 of the pair of cover members 60 are joined together to form a medium cross-section cover 53 having a circular cross section as a whole. The As a joining method, a known technique can be applied, and an adhesive may be used. When using bolts and nuts, the protrusion shape interferes with the notch 64 formed in the radially inward flange 52a of the large cross-section cover 52, so that an additional configuration as described in the embodiment is separately provided. Is required.

    Reference numeral 64 shown in FIG. 2 denotes two notches formed in the radially inward flange 52a of the large cross-section cover 52, and the longitudinal direction of the cover member 60 projecting from two positions on the outer periphery of the middle cross-section cover. The outward flanges 62 are respectively inserted and inserted. The cutout portion 64 of the radially inward flange 52a is slightly wider than the combined length of the pair of longitudinally outward flanges 62 so as to form an appropriate gap.

    Reference numeral 65 shown in FIG. 2 denotes a mating surface constituted by a pair of cover members formed by halving the large cross-section cover 52 in the longitudinal direction. Thus, the mating surface of the large cross-section cover 52 is at an angular position shifted by 90 degrees with respect to the mating surface of the medium cross-section cover 53.

    FIG. 1 shows a three-stage expandable and contractible cylindrical cover assembly 50. However, the intermediate cross-section cover 53 is formed by inserting a plurality of intermediate cross-section covers having different cross-sectional dimensions. May be. In this case, a cylindrical cover assembly having four or more stages as a whole is configured. The intermediate section cover, like the above-described middle section cover 53, is composed of a pair of cover members formed in half in the longitudinal direction, and longitudinal outward flanges at both longitudinal ends of the cover member. And the longitudinal outward flanges of the pair of cover members may be joined together. Further, the radial inward flange of the intermediate section cover may be provided with a notch portion into which the longitudinal outward flange of the cover member protruding to the outer periphery of the intermediate section cover is fitted.

    Hereinafter, an embodiment in which the cylindrical cover assembly of the present invention is applied to a winch lifting device for an aerial work vehicle will be described with reference to FIGS. FIG. 3 shows an aerial work vehicle according to this embodiment.

    FIG. 3 shows an aerial work vehicle equipped with a winch lifting device 3. In this aerial work vehicle, a swivel base 11 is provided on the vehicle 1, and a telescopic boom 12 is attached to the swivel base 11 so as to be raised and lowered. A bucket 13 for boarding an operator is attached to the distal end portion 12 a of the telescopic boom 12 via a winch lifting device 3. A winch 14 is provided at the top of the distal end 12 a of the telescopic boom 12.

    As shown in FIGS. 4 to 7, the winch elevating device 3 includes an outer cylinder 31 made of a round pipe, an inner cylinder 32 made of a square pipe built in the outer cylinder 31, and the inner cylinder 32 as an outer cylinder. And an elevating cylinder 33 that moves up and down with respect to 31. The lower end portion of the outer cylinder 31 is pivotally supported on the tip end portion 12 a of the telescopic boom 12 by the shaft 20. Further, the outer cylinder 31 is always maintained in a vertical posture by the leveling cylinder 21 regardless of the undulation angle of the telescopic boom 12.

    The elevating cylinder 33 is installed in the inner cylinder 32 so that the tube 33a is up and the rod 33b is down. The winch elevating device 3 reduces the elevating cylinder 33 and lowers the inner cylinder 32 relative to the outer cylinder 31, as shown in FIG. In this way, the inner cylinder 32 is moved upward with respect to the outer cylinder 31. The bucket 13 is fixed to the outer cylinder 31 of the winch lifting device 3 via the bucket mounting base 22.

    A base end portion of a base 24 to which the winch 14 is attached is pivotally supported on the winch support base 23 by a shaft 25. The winch base 24 is provided with a hook-suspending arm 17 having a predetermined length. The tip of the rope 15 wound around the winch 14 is suspended downward via the tip sheave of the hook suspension arm 17, and the hook 16 is attached to the tip of the rope.

    In this aerial work vehicle, hydraulic oil to the winch 14 and the arm swing cylinder 18 is supplied and discharged from the bucket mounting base 22 by individual hoses 41, 41,. The individual hoses 41, 41,... Have a surplus length in relation to ascending and descending with the inner cylinder 32. Then, as shown in FIG. 5, the marginal length portions of a plurality of individual hoses 41, 41... Are bundled and the outside is covered with a single hose coating tube 42 to form one oil feeding hose 4. The oil feeding hose 4 is arranged by being wound around the outer periphery of an outer cylinder 31 made of a round pipe a plurality of times.

    In this embodiment, the outer side of the wrapped portion of the oil feeding hose 4 is covered with the cylindrical cover assembly 50. As shown in FIG. 5, the cylindrical cover assembly 50 includes a small cross-section cover 51 fixed to the upper end portion of the bucket mount 22, a large cross-section cover 52 fixed to the upper portion of the inner cylinder 32, and a small cross-section cover 51. And a large cross section cover 52, and a medium cross section cover 53 arranged between the large cross section cover 52 and a triple cover. Other configurations are the same as those of the cylindrical cover assembly 50 described with reference to FIGS. 1 and 2, and thus description thereof is omitted.

    The cylindrical cover assembly 50 comprising the inner and outer triple covers 51, 52, 53 has a medium cross section outside the small cross section cover 51 as shown in FIGS. 4 and 5 when the elevating cylinder 33 of the winch elevating device 3 is in the contracted state. The cover 53 and the large cross-section cover 52 are almost completely polymerized in the radial direction. When the elevating cylinder 33 of the winch elevating device 3 is extended, the large cross-section cover 52 is moved upward together with the inner cylinder 32, and first, the radially inward flange 52a at the lower end of the large cross-section cover is radially outward of the intermediate cross-section cover 52. After engaging the facing flange 53a from below, the medium cross-section cover 53 is pulled up by the large cross-section cover 52, and when the elevating cylinder 33 is fully extended as shown in FIGS. The cover 53 and the large cross-section cover 52 are successively continued up and down.

    Thus, since the intermediate cross-section cover 53 is composed of a pair of cover members formed in half in the longitudinal direction, the intermediate cross-section cover 53 can be attached after the assembly of the winch lifting device 3 is completed. Moreover, since the cylindrical cover assembly 50 covers the outside of the portion where the oil supply hose 4 is wound, the oil supply hose 4 is completely protected. Further, since the oil feeding hose 4 cannot be seen from the outside, the appearance of the winch lifting device is neatly organized.

    FIG. 8 is a detailed sectional view taken along the line B-B of FIG. 7 and shows a method of joining the longitudinally outward flanges 62 of the pair of cover members 60 of the middle cross-section cover 53 of the embodiment. Reference numerals 66 and 67 denote pressing members for the outward flange 62 in the longitudinal direction. Both the holding members 66 and 67 have the same width as the cross section of the longitudinal outward flange 62 in cross section. Further, it has substantially the same longitudinal dimension as the outward flange 62 in the longitudinal direction. The material of the pressing members 66 and 67 is nylon used for the slide plate.

    As shown in FIG. 8, the presser member 66 is provided with a counterbore 69 for the screw 68, and the presser member 67 has a tap hole 70 for the screw 68. The screw 68 passes through a screw hole 71 formed in the longitudinally outward flange 62 and tightens the pressing member 67 against the pressing member 67. The pressing members 66 and 67 are provided with four tightening portions by screws 68 along the longitudinal direction thereof.

    Thus, the screw 68 can be used for the joining method of the longitudinal outward flanges 62 of the pair of cover members 60 of the middle cross-section cover 53. Even when bolts and nuts are used, almost the same method may be used. In this method of using a slide plate for the holding members 66 and 67, the slide plate comes into contact with the notch 64 provided in the radially inward flange 52a of the large cross-section cover 52 shown in FIG. This has the effect that the expansion and contraction operation of the cover assembly 50 becomes smoother.

50: cylindrical cover assembly 51: small section cover 52: large section cover 52a: radially inward flange 53: medium section cover 53a: radially outward flange 60: cover member 61: radially inward flange 62: longitudinal Direction outward flange 63: radial direction outward flange 64: notch 65: mating surface 66: presser member 67: presser member 68: screw 69: counterbore 70: tap hole 71: screw hole

Claims (3)

An expandable and contractible cylindrical cover assembly that covers a work device portion that expands and contracts the work machine,
A medium cross-section cover is inserted into the large cross-section cover, and a small cross-section cover is inserted into the medium cross-section cover. A radially outward flange at the end of the cross section cover on the large cross section cover side engages with the radially inward flange at the end of the medium cross section cover on the small cross section cover side and the medium cross section cover of the small cross section cover In the cylindrical cover assembly in which the large cross-section cover, the medium cross-section cover, and the small cross-section cover can be expanded and contracted integrally with each other by engaging with the radially outward flange at the end on the side,
The middle cross-section cover is composed of a pair of cover members formed in half in the longitudinal direction, and both longitudinal ends of the cover members are provided with longitudinal outward flanges, and the longitudinal direction of the pair of cover members It is configured so that the direction outward flanges are joined together,
The radially inward flange of the large cross-section cover is provided with a notch portion into which a longitudinal outward flange of the cover member protruding from the outer periphery of the medium cross-section cover is fitted. Cylindrical cover assembly.     2. The expandable and contractible cylindrical cover assembly according to claim 1, wherein the large cross-section cover, the medium cross-section cover, and the small cross-section cover have a circular cross-sectional shape.     2. The expandable / contractable cylindrical cover assembly according to claim 1, wherein the intermediate cross-section cover is configured by inserting a plurality of intermediate cross-section covers having different cross-sectional dimensions.

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