Retractable fastening device for portable work equipment

Abstract

To improve safety and usability of a step for elevation disposed on a soundproof box of a mobile work machine.SOLUTION: A storage-type locking tool 30 comprises a locking tool main body 40 mounted on a crossbar 23 laid in a recessed groove 13 formed on an external wall of a soundproof box and used as a step and the like, and a stopper mechanism 50 for restricting rotation of the locking tool main body 40 around the cross bar 23 as a center. By changing a mounting state of the locking tool main body 40 of the storage-type locking tool 30 to the crossbar 23 to a storage state in which a load receiving portion 41 of the locking tool main body 40 is disposed in a recessed portion 13 and a developed state in which the load receiving portion 41 is disposed outside of the recessed portion 13, the locking tool main body 40 is used as a platform (step) in elevating the soundproof box in the developed state in use, footsteps can be easily seen in an elevation motion so that stepping-off and the like hardly occurs, and safety elevation can be performed.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a retractable fastening device that is provided in a soundproof box of a portable work machine that is packaged by housing the work machine main body, such as a generator main body or a compressor main body, the engine that drives these work machine main bodies, and other components within the soundproof box, and more specifically, to a retractable fastening device for a portable work machine that can be unfolded from its stored state when in use, and used as a foothold (step) for workers when ascending and descending on the soundproof box, or as a fastening device for various purposes, such as a rope hook for fastening a cargo rope to secure the portable work machine when transporting it. [Background technology]

[0002] Portable work machines are packages that contain the main body of the work machine, such as the generator body and compressor body, the engine that drives the main body of the work machine, and other necessary equipment, all housed in a soundproof box.Since they can be used regardless of the installation location, they are widely used as sources of power and compressed air for outdoor work at construction sites, etc.

[0003] Some of these portable work machines are equipped with lifting hardware for securing the crane hook, rope hooks for securing the load rope, and steps that workers can use to climb up and down the soundproof box when attaching the crane hook to the lifting hardware or tying the rope to the rope hook, in order to make it easier to load onto a truck or transport it.

[0004] If such hanging fittings, robe hanging fittings, steps for climbing, etc. are installed protruding outward from the outer wall of the soundproof box of the portable work machine, not only will the space required for setting up and storing the portable work machine increase, but the protruding parts may come into contact with people or objects during transportation or loading and unloading, causing accidents or damage.

[0005] Therefore, such hanging fittings, rope hanging fittings, steps, etc. are placed so that they do not protrude beyond the outer wall of the soundproof box, for example by being housed in recesses provided in the outer wall of the soundproof box.

[0006] As an example of the configuration of such a portable work machine 700, Patent Document 1, cited below, discloses a configuration in which, as shown in Figure 12, a side panel 711 and a top panel 712 of a soundproof box 710 are divided into front and rear parts at the center in the longitudinal direction by a channel material, and a groove 713 is formed by this channel material, and cross bars 721, 722, 723 made of metal rod material or pipe material are erected between side walls 713a, 713a of this groove 713, and these cross bars 721, 722, 723 are used as the hanging brackets or steps mentioned above.

[0007] Specifically, in the portable work machine of Patent Document 1 shown in Figure 12, the cross beam 721 provided in the center of the groove 713 provided in the front and rear top panels 712 serves as a lifting bracket used when lifting with a crane, and the other cross beams 722, 723 serve as steps used by workers when ascending and descending the soundproof box.

[0008] It should be noted that the portable work machine 700 described in the above-mentioned Patent Document 1 does not have any components corresponding to a rope hook for securing a cargo rope to secure the portable work machine 700 to the bed of a truck or the like when the portable work machine 700 is mounted on the bed.

[0009] However, if the above-mentioned cross bars 722, 723 for the steps are attached to the soundproof box 710 with the required strength, the cross bars 722, 723 for the steps can also be used as rope hooks for securing cargo ropes. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-202457 Summary of the Invention [Problem to be solved by the invention]

[0011] The configuration of the conventional portable work machine 700 described above is provided with cross bars 721, 722, 723 that can be used as lifting fixtures for engaging the hook of a crane, steps for ascending and descending, rope hanging fixtures, etc., but by attaching these cross bars 721, 722, 723 within grooves 713 formed in the soundproof box 710, these components are positioned so that they do not protrude outside the outer walls of the soundproof box 710 (top panel 712 and side panel 711).

[0012] However, in a configuration in which cross bars 721, 722, and 723 are provided within the aforementioned groove 713, when such cross bar 723 is used as a step for ascending or descending, the worker's toes will be inside the groove 713 when the worker places his or her foot on cross bar 723, making it difficult for the worker to see his or her toes and making it easy for the worker to step off the step, which is dangerous.

[0013] Furthermore, since the formation of the groove 713 narrows the storage space within the soundproof box 710, it is difficult to make the groove 713 deep enough, and the groove 713 is generally formed as a relatively shallow groove with a depth of about 10 cm.

[0014] Therefore, as shown in Figure 13, only the tip of the worker's toes is inserted into the groove 713 and rests on the crossbar 723, and when wearing shoes (safety shoes), the worker's entire weight is supported only by the part of the foot that is closer to the toes than the ball of the foot.This, combined with the fact that the crossbar 723 is generally made of a cylindrical material that is slippery, makes it difficult for the worker to brace their feet and perform climbing and descending movements, and there is also a risk of an accident occurring due to the worker slipping off the platform.

[0015] Furthermore, when a part of the step cross bars 722, 723 described above, for example the top cross bar 722 of the step cross bars 722, 723, is used as a rope hanging fixture, if a cargo rope is fastened and secured to the cross bar 722 provided in the groove 713, depending on how the rope is hung, the rope hung on the cross bar 722 will interfere with the corner formed by the edge of the groove 713, as shown in the enlarged view in Figure 14.

[0016] A rope that interferes with such a corner not only becomes more likely to break due to the localized load placed on the interfering part, but also makes it more likely that the paint on the soundproof box 710 will peel off at the interfering part due to the interference with the rope.If a wire rope or the like is tightened to hang a load, the rope may dig into the interfering part, causing deformation such as a dent in the soundproof box 710.

[0017] In this way, it is desirable that the aforementioned cross bars 722, 723 used as steps, rope hooks, etc. are located inside the outer wall of the soundproof box 710 when installing or storing the portable work machine 700, but when actually using them as steps or rope hooks, it is desirable for them to be located outside the groove 713, and therefore protruding outward from the outer wall of the soundproof box 710, for both safety and ease of use, which are contradictory requirements.

[0018] However, the configuration of conventional portable work machines has not been able to meet these conflicting demands.

[0019] In the above explanation of the prior art, we have given an example of the case where the aforementioned cross bars 722, 723, which are used as steps, rope hanging fittings, etc., are installed within a ``groove'' formed in the soundproof box 710, but the problem described above is not limited to grooves and can similarly arise when cross bars are installed within a recess that takes a form other than a ``groove'' formed in the soundproof box.

[0020] Therefore, the present invention aims to provide a retractable fastening device that is installed in a recess such as a groove in the soundproof box of a portable work machine and is used in combination with the aforementioned steps and cross bars used as rope hooks, thereby making it possible to simultaneously satisfy the aforementioned conflicting requirements while maintaining the structure of existing portable work machines. [Means for solving the problem]

[0021] The means for solving the problems are described below together with the reference numerals used in the description of the embodiment of the invention. These reference numerals are used to clarify the correspondence between the description of the claims and the description of the embodiment of the invention, and needless to say, are not used to restrict the interpretation of the technical scope of the present invention.

[0022] In order to achieve the above object, the retractable fastening device 30 of the portable working machine 1 of the present invention is In a retractable fastening device 30 for a portable work machine 1, the retractable fastening device 30 has a recess 13 such as a recessed groove provided on the outer wall of a soundproof box 10 and cross bars 22, 23 installed between the side walls 13a, 13a of the recess 13. The retractable fastening device 30 comprises a fastening device body 40 attached to the cross bars 22, 23, and a stopper mechanism 50 (see Figures 4, 7, and 10) that restricts the rotation of the fastening device body 40 around the cross bars 22, 23, The fastening device main body 40 comprises a load receiving portion 41 that receives a downward load during use, and bracket portions 42, 42 that are parallel to each other and have one end 42a, 42a connected to each end of the load receiving portion 41 (see Figures 2, 5, 8), and has cross bar insertion portions 44 at the other ends 42b, 42b of the bracket portions 42, 42 into which the cross bars 22, 23 are inserted, and is configured to be attachable to the cross bars 22, 23 by inserting the cross bars 22, 23 into the cross bar insertion portions 44, and is configured so that the attachment state to the cross bars 22, 23 can be changed between a stored state in which the load receiving portion 41 is positioned within the recess 13 [see Figures 4(B), 7(B), 10(B)] and an expanded state in which the load receiving portion 41 is positioned outside the recess 13 [see Figures 4(A), 7(A), 10(A)], The stopper mechanism 50 restricts the locking device main body 40, at least in the deployed state, from rotating in a direction that would move the load-receiving portion 41 downward (Claim 1).

[0023] In the retractable fastening device 30 having the above configuration, The fastener body 40 is attached to the cylindrical cross bars 22, 23, The cross bar insertion portion 44 of the locking device main body 40 is a through hole 441 (see Figure 2) into which the cross bars 22, 23 can be inserted, and the locking device main body 40 can be configured to rotate around the cross bars 22, 23 inserted into the through hole 441 as a fulcrum, thereby changing the attachment state of the locking device main body 40 relative to the cross bars 22, 23 between the stored state and the deployed state (see claim 2, Figures 2 to 4).

[0024] In this case, the stopper mechanism 50 may be a stopper member 51 protruding from the side walls 13a, 13a of the recess 13, which abuts against the locking device main body 40 at least in the expanded state and restricts the rotation of the locking device main body 40, which moves the load-receiving portion 41 downward (see claim 3, Figures 2 to 4).

[0025] Another configuration of the retractable fastener 30 is as follows: The horizontal bar insertion portion 44 has a height direction perpendicular to the length direction of the bracket portion 42, and is provided with a fitting groove 442 having one end as a closed end 442a and the other end as an open end 442b. The load receiving portion 41 is placed in the recess 13, and the open end 442b of the fitting groove 442 is opened downward, and the cross bars 22, 23 are inserted into the fitting groove 442 from the open end 442b, so that the locking device main body 40 can be attached to the cross bars 22, 23 in the stored state, With the load receiving portion 41 disposed outside the recess 13 and the open end 442b of the fitting groove 442 open downward, the horizontal bars 22 and 23 are inserted into the fitting groove 442 from the open end 442b, thereby expanding the fastening device body 40. situation It may also be possible to attach the horizontal beams 22 and 23 to the horizontal beams 22 and 23 (see claim 4 and Figs. 5 to 10).

[0026] The structure in which the engaging groove 442 is provided in the locking device body 40 is further as follows: The fastener body 40 is attached to the cylindrical cross bars 22 and 23, The stopper mechanism 50 may be provided with a stopper member 51 protruding from the side walls 13a, 13a of the recess 13, which abuts against the locking device main body 40 at least in the deployed state to restrict the rotation of the locking device main body 40 (see claim 5, Figures 5 to 7), or The attachment object of the fastening device body 40 is the cross bars 22, 23 having a pair of vertical surfaces formed by square timber or the like, The width of the engagement groove 442 may be formed to be approximately the same as the distance between the pair of vertical surfaces of the cross bars 22, 23 within a range in which the cross bars 22, 23 can be inserted, thereby forming the stopper mechanism 50 that restricts the rotation of the locking device main body 40 (see claim 6 and Figures 8 to 10). [Effects of the Invention]

[0027] The retractable fastening device 30 of the portable working machine 1 of the present invention described above has the following significant effects.

[0028] The locking device main body 40 attached to the cross bars 22, 23 in the stored state does not protrude outside the outer wall of the soundproof box 10, and does not increase the storage or installation space of the portable work machine 1. On the other hand, when the locking device main body 40 is attached to the cross bars 22, 23 in the unfolded state, the load-receiving portion 41 of the locking device main body 40 can be positioned outside the recess 13, and therefore outside the outer wall of the soundproof box 10.

[0029] In this manner, when the fastening device main body 40 is attached to the cross bars 22, 23 in the unfolded state, the rotation that moves at least the load-receiving portion 41 downward is restricted by the stopper mechanism 50, so that the load-receiving portion 41 of the fastening device main body 40 can be used as a step for holding hands or feet when ascending or descending the soundproof box 10, or as a rope fastening device for securing a rope for hanging cargo.

[0030] As a result, by using the load-receiving portion 41 of the fastening device main body 40 arranged outside the recess 13 as a foothold (step), the worker can ascend and descend safely and reliably while checking his or her footing as shown in Figure 11, and can ascend and descend by placing the ball of the foot or the part of the foot closer to the arch than the ball of the foot on the load-receiving portion 41 of the fastening device main body 40 as shown in Figures 4(A), 7(A), and 10(A).This makes it less likely that the worker will slip off the step and allows the worker to stably place their weight on the step, making it possible to ascend and descend safely and reliably.

[0031] In addition, when the portable work machine 1 is loaded onto the bed of a truck, etc., it can be unfolded. situation By fastening the load suspending rope to the load receiving portion 41 of the fastening device main body 40 at the position where the portable work machine 1 is fixed to the loading platform, it is possible to prevent the load suspending rope from interfering with the corner formed on the opening edge of the recess 13, as shown in the enlarged view in Figure 1, and it is also possible to prevent the rope from breaking, and the paint on the soundproof box 10 from peeling off or deforming, which would otherwise occur due to such interference.

[0032] In a configuration in which the fastening device main body 40 is attached to the cylindrical cross bars 22, 23, and the fastening device main body 40 is provided with through holes 441 as cross bar insertion sections 44 into which the cross bars 22, 23 can be inserted, and the cross bars 22, 23 are inserted into the through holes 441 (see Figures 2 to 4), by rotating the fastening device main body 40 around the cross bars 22, 23, the attachment state to the cross bars 22, 23 can be easily switched between the stored state and the deployed state (see Figure 4).

[0033] Furthermore, with this configuration, the locking device main body 40 cannot be removed from the cross bars 22, 23 unless the cross bars 22, 23 are removed from the side walls 13a, 13a of the recess 13, which prevents the locking device main body 40 from being lost due to the locking device main body 40 unintentionally falling off, etc.

[0034] On the other hand, in a configuration in which the fastening device main body 40 is provided with an engaging groove 442 having one end as a closed end 442a and the other end as an open end 442b, and this engaging groove 442 serves as the cross bar insertion portion 44, in order to switch the attachment state of the fastening device main body 40 to the cross bars 22, 23 from the stored state to the deployed state or from the deployed state to the stored state, it is necessary to first lift the fastening device main body 40 upward, remove the fastening device main body 40 from the cross bars 22, 23, and then change the orientation of the fastening device main body 40 and reattach it; however, when attaching or detaching the fastening device main body 40, it is not necessary to remove the cross bars 22, 23 from the side walls 13a, 13a of the recess 13, so the retractable fastening device 30 of the present invention can be easily added as a retrofit to an existing portable work machine 1.

[0035] Furthermore, in a configuration in which the attachment target of the locking device main body 40 is cross bars 22, 23 formed from square timber, or cross bars 22, 23 having a pair of vertical surfaces, the width of the engagement groove 442 provided on the other end 42b of the bracket part 42 within the range in which the cross bars 22, 23 can be inserted can be made approximately the same width as the distance between the pair of vertical surfaces of the cross bars 22, 23, so that the cross bars 22, 23 and the engagement groove 442 themselves can be used as the stopper mechanism 50, and there is no need to provide a separate stopper member 51 or the like that protrudes from the side walls 13a, 13a of the recess 13, thereby simplifying the structure by reducing the number of parts. [Brief explanation of the drawings]

[0036] [Figure 1] 1 is a perspective view of a portable work machine equipped with a retractable fastening device of the present invention; [Figure 2] FIG. [Figure 3] 1A and 1B are perspective views of a retractable fastening device of the present invention, where (A) is a view from above and (B) is a view from below. [Figure 4] 1A and 1B are explanatory diagrams of the retractable fastening device of the present invention, in which (A) shows the deployed state and (B) shows the retracted state. [Figure 5] FIG. 10 is a perspective view of a modified example of the fastener body. [Figure 6] 1A and 1B are perspective views of a modified example of the retractable fastening device of the present invention, where (A) is a view from above and (B) is a view from below. [Figure 7] 1A and 1B are explanatory diagrams of a modified example of the retractable fastening device of the present invention, in which (A) shows the deployed state and (B) shows the retracted state. [Figure 8] FIG. 10 is a perspective view of another modified example of the fastener body. [Figure 9] 10A and 10B are perspective views of another modified example of the retractable fastening device of the present invention, where (A) is a view from above and (B) is a view from below. [Figure 10] 10A and 10B are explanatory diagrams of another modified example of the retractable fastening device of the present invention, in which (A) shows the deployed state and (B) shows the retracted state. [Figure 11] 10A and 10B are explanatory diagrams illustrating the use state of the retractable fastening device of the present invention as a step. [Figure 12] FIG. 1 is a perspective view of a conventional portable working machine (corresponding to Patent Document 1). [Figure 13] FIG. 10 is an explanatory diagram showing a state in which a foot is engaged when a horizontal bar provided on a conventional portable working machine is used as a step. [Figure 14] FIG. 10 is an explanatory diagram showing interference between the rope and the soundproof box when a cross bar provided on a conventional portable work machine is used as a rope hook. DETAILED DESCRIPTION OF THE INVENTION

[0037] Next, an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0038] Reference numeral 1 in FIG. 1 denotes a portable working machine equipped with a retractable fastening device of the present invention.

[0039] This portable work machine 1 is packaged in a soundproof box 10, housing an engine (not shown), the work machine body (not shown) such as the generator body and compressor body driven by the engine, and other necessary equipment.

[0040] In the embodiment shown in Figure 1, the soundproof box 10 is composed of a frame 11 that is rectangular in plan view and functions as a base on which the equipment housed inside is placed, and a bonnet 12 that covers the frame 11.

[0041] The hood 12 is composed of side walls consisting of a front panel 121, a rear panel 122, and a side panel 123 that are erected from the four sides of the frame 11, and a top panel 124 that covers the upper part of the space surrounded by these side walls (front panel 121, rear panel 122, and side panel 123).

[0042] A channel member is attached to the side panel 123 and the top panel 124 of this bonnet 12 in the longitudinal center to divide the side panel 123 and the top panel 124 into front and rear sections, forming a recess (groove) 13, and cross bars 21 to 23 are provided between the side walls 13a, 13a of this groove 13, which is the same as the configuration of the conventional portable work machine described with reference to Figure 12.

[0043] Furthermore, of the cross beams 21 to 23 erected between the side walls 13a, 13a of the groove 13, the cross beam 21 located in the longitudinal center of the groove 13 that divides the top panel 124 into front and back halves is used as a lifting bracket for engaging a crane hook when suspending it with a crane, which is the same as the configuration of the conventional portable work machine described with reference to Figure 12.

[0044] In the portable work machine 700 described with reference to Figure 12, of the cross bars 721 to 723 provided in the groove 713, the cross bars 722 and 723 other than the cross bar 721 used as the hanging bracket described above are also used as steps, etc.

[0045] In contrast to this, in the configuration of the present invention, the soundproof box 10 of the portable work machine 1 is provided with a locking device main body 40 that is attached to the cross bars 22, 23 other than the cross bar 21 that serves as the hanging bracket among the cross bars 21 to 23 mentioned above, and a retractable locking device 30 that has a stopper mechanism 50 that regulates the rotation of the locking device main body 40.

[0046] The fastening device main body 40, which is attached to the aforementioned cross bars 22 and 23, has a load-receiving portion 41, as shown in Figure 2, which serves as a part for hanging hands or feet when used as a step, and a part for hanging a rope when used as a rope hook, thereby applying a downward load, and bracket portions 42 and 42, one end 42a of which is connected to each end of this load-receiving portion 41 and which are arranged parallel to each other.

[0047] In the illustrated example, the locking device main body 40 is formed in an approximately U-shape consisting of the aforementioned load-receiving portion 41 and bracket portions 42, 42, but is not limited to this shape. For example, as shown as a modified example in Figures 5 and 8, the other ends 42b, 42b of the bracket portions 42, 42 may be connected by a reinforcing plate 43 to form a rectangular frame shape.

[0048] On the other end 42b, 42b side of these bracket portions 42, 42, there is provided a cross bar insertion portion 44 for inserting a cross bar (22 or 23) provided in the groove 13 of the soundproof box 10, and in the embodiment shown in Figure 2, this cross bar insertion portion 44 is formed as a through hole 441 into which the cross bar is inserted.

[0049] In this way, in the configuration of the locking device main body 40 shown in Figure 2, which has a through hole 441 provided as the cross bar insertion portion 44, the locking device main body 40 is configured to be able to rotate around the cross bar (22 or 23) by inserting the cross bar (22 or 23) into this through hole 441 and attaching the locking device main body 40 to the cross bar (22 or 23).

[0050] As a result, by rotating the fastening device main body 40 clockwise on the paper around the cross bar 23 from the deployed state in which the load-receiving portion 41 is positioned outside the groove 13 as shown in Figure 4(A) to the stored state in which the load-receiving portion 41 is positioned within the groove 13 as shown in Figure 4(B), the mounting state of the fastening device main body 40 relative to the cross bar 23 can be switched.

[0051] The stopper mechanism 50 restricts the locking device main body 40 in the deployed and stored states from rotating from this position in a direction that would move at least the load receiving portion 41 downward.

[0052] In the embodiment shown in Figures 3 and 4, a stopper member 51 that abuts against the locking device main body 40 in the unfolded state and stored state described above and restricts the rotation of the locking device main body 40 that moves the load receiving portion 41 downward (rotation counterclockwise on the page in the unfolded state of Figure 4(A) and rotation clockwise on the page in the stored state of Figure 4(B)) is formed to protrude from the side walls 13a, 13a of the groove 13, forming the aforementioned stopper mechanism 50.

[0053] In the illustrated embodiment, the stopper member 51 is a rod member installed between the side walls 13a, 13a of the groove 13, but instead of this configuration, a protrusion may be provided on one or both of the side walls 13a, 13a of the groove 13 at the attachment position of the end of the stopper member 51, which is a rod member, and this protrusion may be used as the stopper member.

[0054] In the embodiment shown in Figs. 2 to 4, the locking piece 45 is protruded from the other end 42b of the bracket part 42 of the locking device main body 40 in a direction perpendicular to the longitudinal direction of the bracket part 42, thereby forming the bracket part 42 into a substantially L-shape, thereby enabling the locking piece 45 to be unfolded. situation In the stored state (see Figure 4(A)), this locking piece 45 is configured to abut against the stopper member 51 to restrict rotation, and in the stored state (see Figure 4(B)), the bracket portion 42 of the locking device main body 40 is configured to abut against the stopper member 51 while placed on top of it, thereby restricting rotation of the locking device main body 40.

[0055] In the retractable fastening device 30 configured as described above, in the stored state shown in Figure 4 (B), the fastening device main body 40 is stored with the load-receiving portion 41 positioned within the recessed groove 13, so that the fastening device main body 40 does not protrude from the outer wall of the soundproof box 10. As a result, the installation space and storage space of the portable work machine 1 are not expanded, and accidents and damage caused by the fastening device main body 40 colliding with people, objects, etc. are prevented when loading and unloading work on the truck bed or transporting work is performed.

[0056] On the other hand, by setting the locking device main body 40 in the expanded state shown in Figure 4(A), when the load-receiving portion 41 of the locking device main body 40 is used as a step to be used when ascending or descending to the soundproof box 10, the load-receiving portion 41, which is the part where the worker places his or her feet, is positioned outside the groove 13, so that the worker can ascend or descend while visually checking the position where he or she places his or her feet, as shown in Figure 11, and can perform the ascending or descending operation safely.

[0057] Furthermore, by installing the fastening device main body 40, the worker can place his / her foot not only on the load-receiving portion 41 of the fastening device main body 40 but also on the cross bar 23 at the same time, which allows a wider area of ​​the sole of the foot to be placed in a stable state compared to the conventional structure in which the foot was placed only on the cross bar 23, and also allows the worker to place his / her foot from the toes, over the ball of the foot and even on the arch side, which significantly reduces the risk of slipping off.

[0058] Furthermore, as mentioned above, the fastening device main body 40 is formed in a U-shape (see Figure 2) consisting of a load-receiving portion 41 and a bracket portion 42, or in a rectangular frame shape (see Figures 5 and 8) with a reinforcing plate 43 added thereto, so that a gap is formed between the load-receiving portion 41 and the cross bar 23 through which a rope or the like can be passed.

[0059] Therefore, when the retractable fastening device 30 of the present invention is deployed, it can be used not only as a step when ascending and descending the soundproof box, but also as a rope hook for fastening a cargo rope to secure the box to the bed of a truck or the like when the box is loaded onto the bed.

[0060] Figure 1 shows an example in which the locking device main body 40 attached to the cross bar 22 located at the top of the cross bars 22, 23 is used as a rope hook for locking a load rope when the portable work machine 1 is placed on the bed of a truck, etc. By locking the load rope to the load receiving portion 41 of the locking device main body 40 which is positioned outside the groove 13 in the unfolded state as shown in Figure 1, it is possible to prevent the rope hung on the load receiving portion 41 of the locking device main body 40 from interfering with the corner formed on the opening edge of the groove 13, as shown in the enlarged view in Figure 1.

[0061] As a result, it was possible to effectively prevent the rope from breaking, and the paint on the soundproof box 10 from peeling or deforming at the point where it interferes with the rope, which can occur when the rope interferes with the corners of the opening edge of the groove 13.

[0062] In the example shown in Figure 1, a retractable fastening device 30 having a fastening device main body 40 attached to the top cross bar 22 is used as a rope hanging fixture, but a retractable fastening device 30 having a fastening device main body 40 attached to a cross bar 23 located lower than this may also be used as a rope hanging fixture.

[0063] In the configuration of the retractable fastening device 30 described above with reference to Figures 2 to 4, the cross bar insertion portion 44 provided on the other end side of the bracket portion 42 of the fastening device main body 40 is configured as a through hole 441 into which the cross bar (22 or 23) is inserted.

[0064] In contrast to this, the embodiment shown in Figures 5 to 7 is similar to the retractable fastening device 30 described with reference to Figures 2 to 4 in that the cross bar (22 or 23) to which the fastening device main body 40 is attached is cylindrical, but the cross bar insertion portion 44 provided on the other end 42b side of the bracket portion 42 of the fastening device main body 40 has a height direction perpendicular to the length direction of the bracket portion 42, and is provided with an engaging groove 442 with one end formed as a closed end 442a and the other end formed as an open end 442b.

[0065] As shown in Figure 7(A), the load-receiving portion 41 is positioned outside the recessed groove 13, and the open end 442b of the fitting groove 442 is directed downward, and the fastening device main body 40 is lowered toward the cross bar (22 or 23), and the cross bar (22 or 23) is inserted into the fitting groove 442 from the open end 442b, so that the fastening device main body 40 can be attached to the cross bar (22 or 23) in the unfolded state.

[0066] On the other hand, when the locking device main body 40 is to be put into the stored state shown in Figure 7(B), the locking device main body 40, which is attached to the cross bar (22 or 23) in the unfolded state as shown in Figure 7(A), is first lifted upward to remove the cross bar (22 or 23) from the fitting groove 442, and after locking in this state, the main body 40 is rotated horizontally by 180 degrees to position the load-receiving portion 41 in the recessed groove 13 and with the open end 442b of the fitting groove 442 facing downward, the locking device main body 40 is lowered toward the cross bar (22 or 23) and the cross bar (22 or 23) is inserted into the fitting groove 442 from the open end 442b, thereby allowing the locking device main body 40 to be attached to the cross bar (22 or 23) in the stored state.

[0067] As in the embodiment described with reference to Figures 3 and 4, in the configuration of the retractable fastening device 30 of this embodiment, a rod member installed between the side walls 13a, 13a of the groove 13 is provided as a stopper member 51 within the groove 13, and this stopper member 51 is provided as a stopper mechanism 50 that regulates the rotation of the fastening device main body 40.

[0068] In the embodiment shown in Figures 5 to 7, the bracket portion 42 of the locking device main body 40 is provided with locking pieces 46a, 46b that extend the open end of the fitting groove 422, and the aforementioned stopper member 51 abuts against the bottom edge of the bracket portion 42 and the corner of the locking piece 46a in the unfolded state, and against the bottom edge of the bracket portion and the corner of the locking piece 46b in the stored state, so that in both the stored state and the unfolded state, clockwise and counterclockwise rotation of the locking device main body 40 around the cross bar (22 or 23) is restricted.

[0069] The retractable fastening device 30 described with reference to Figures 5 to 7 also has the same effect as the retractable fastening device 30 described with reference to Figures 2 to 4 in that, when used as a step for ascending and descending, it allows the feet to be placed stably and allows for safe ascending and descending movements, and when used as a rope hanging fixture, it prevents interference between the rope and the corners of the opening edge of the groove.

[0070] In addition, in the retractable fastening device 30 of this embodiment described with reference to Figures 5 to 7, as mentioned above, when changing the attachment state to the cross bar (22 or 23) from the stored state to the deployed state, and when changing the attachment state to the cross bar (22 or 23) from the deployed state to the retracted state, it is necessary to first lift the fastening device main body 40 upward and remove it from the cross bar (22 or 23). This makes the storage and deployment operations more time-consuming than the configuration of the retractable fastening device 30 described with reference to Figures 2 to 4, which can be switched between the stored state and the deployed state simply by rotating it around the cross bar (22 or 23).

[0071] However, in the retractable fastening device 30 described with reference to Figures 2 to 4, the rod material that becomes the cross bar (22 or 23) needs to be inserted into the through hole 441 provided in the fastening device main body 40, and both ends of the cross bar (22 or 23) need to be fixed to the side walls 13a, 13a of the groove 13, so the fastening device main body 40 needs to be attached during the manufacturing stage of the soundproof box 10.In contrast, in the retractable fastening device 30 of this embodiment described with reference to Figures 5 to 7, if the stopper member 51 is attached in the groove 13 provided in the soundproof box 10, the fastening device main body 40 can be easily attached later after the soundproof box 10 is completed, and it can also easily accommodate the addition of retractable fastening devices 30 that are added later to portable work machines.

[0072] Figures 8 to 10, like the retractable fastening device 30 described above with reference to Figures 5 to 7, adopt a configuration in which an engagement groove 442 is provided as the cross bar insertion portion 44 of the fastening device main body 40, but differ in that the cross bar (22 or 23) to which the fastening device main body 40 is attached has a pair of vertical surfaces, such as a piece of timber.

[0073] In the embodiment shown in Figures 9 and 10, square timber is used as such cross bars (22 or 23), but as mentioned above, the cross bars (22 or 23) are not limited to square timber and various shapes can be used as long as they have a pair of vertical surfaces.

[0074] In the configuration of this embodiment, the width of the aforementioned mating groove 442 provided in the bracket portion 42 of the locking device main body 40 is configured to be approximately the same width as the distance between the pair of vertical surfaces within the range in which the cross bar (22 or 23) can be inserted.

[0075] By configuring it in this manner, when the open end 442b of the engagement groove 442 provided in the engagement device main body 40 is directed downward and the engagement device main body 40 is lowered and the cross bar (22 or 23) is inserted into the engagement groove 442, the engagement device main body 40 is fixed in the deployed or stored position and is configured so that it cannot rotate around the cross bar (22 or 23).

[0076] Therefore, in the configuration of the retractable fastening device 30 described with reference to Figures 8 to 10, a stopper mechanism 50 is formed by combining a cross bar (22 or 23) with a pair of vertical surfaces and an engaging groove 442 in the fastening device main body 40, which restricts the rotation of the fastening device main body in the deployed and retracted states.

[0077] In the retractable fastening device 30 described above with reference to Figures 8 to 10, a rod with a pair of vertical surfaces, such as the aforementioned square timber, is attached as a cross bar (22 or 23) to be installed in the groove 13 provided in the soundproof box 10 of the portable work machine 1, so there is no need to attach a stopper member 51 to the groove 13 of the soundproof box 10, as in the retractable fastening device 30 described with reference to Figures 2 to 4 and Figures 5 to 7.

[0078] Therefore, the retractable fastening device 30 described with reference to Figures 8 to 10 can reduce the number of parts compared to the configurations of other embodiments, and it becomes even easier to add more retractable fastening devices 30 after the soundproof box has been manufactured. [Explanation of symbols]

[0079] 1 Portable work equipment 10 Soundproof box 11 frames 12. Bonnet 121 Front Panel 122 Rear panel 123 Side Panel 124 Top Panel 13 Recess (groove) 13a Side wall (groove) 21 Crosspiece (for hanging hardware) 22 Crosspiece (for step and rope hook) 23 Horizontal bar (for steps) 30 Retractable locking device 40 Locking device body 41 Load receiving part 42 Bracket part 42a One end (of bracket) 42b Other end (bracket part) 43 Reinforcement plate 44 Crosspiece insertion section 441 Through hole 442 fitting groove 442a Closed end (of fitting groove) 442b Open end (of fitting groove) 45,46a,46b Locking piece 50 Stopper mechanism 51 Stopper member 700 Portable Work Machine 710 Soundproof Box 711 Side Panel 712 Top Panel 713 Groove 713a Side wall (grooved) 721 Crosspiece (for hanging hardware) 722 Crosspiece (for step and rope hook) 723 Horizontal bars (for steps)

Claims

1. A retractable fastening device for a portable work machine having a recess provided in the outer wall of a soundproof box and a crosspiece installed between the side walls of the recess, The retractable fastener comprises a fastener body attached to the horizontal beam and a stopper mechanism that restricts rotation of the fastener body around the horizontal beam, The fastener body comprises a load receiving portion that receives a downward load during use, and bracket portions that are parallel to each other and have one end connected to each end of the load receiving portion, and has a cross bar insertion portion on the other end side of the bracket portion into which the cross bar is inserted, and is configured to be attachable to the cross bar by inserting the cross bar into the cross bar insertion portion, and is configured so that the attachment state to the cross bar can be changed between a stored state in which the load receiving portion is positioned within the recess and an expanded state in which the load receiving portion is positioned outside the recess, A retractable fastening device for a portable work machine, characterized in that the stopper mechanism restricts the rotation of the fastening device main body, at least in the deployed state, in a direction that would move the load-receiving portion downward.

2. The fastener body is attached to the cylindrical crosspiece, A retractable fastening device for a portable work machine as described in claim 1, characterized in that the cross bar insertion portion of the fastening device main body is a through hole into which the cross bar can be inserted, and the fastening device main body rotates around the cross bar inserted into the through hole as a fulcrum, thereby allowing the attachment state of the fastening device main body to the cross bar to be changed between the stored state and the deployed state.

3. A retractable fastening device for a portable work machine as described in claim 2, characterized in that the stopper mechanism comprises a stopper member protruding from the side wall of the recess, which abuts against the fastening device main body at least in the deployed state and restricts the rotation of the fastening device main body that moves the load-receiving portion downward.

4. The horizontal bar insertion portion is a fitting groove having a height direction perpendicular to the length direction of the bracket portion, one end being a closed end and the other end being an open end, The load receiving portion is disposed in the recess and the open end of the fitting groove is opened downward, and the horizontal bar is inserted into the fitting groove from the open end, whereby the locking device main body can be attached to the horizontal bar in the stored state; A retractable fastening device for a portable work machine as described in claim 1, characterized in that the fastening device main body can be attached to the cross beam in the unfolded state by positioning the load-receiving portion outside the recess and opening the open end of the fitting groove downward, and inserting the cross beam into the fitting groove from the open end.

5. The fastener body is attached to the cylindrical crosspiece, A retractable fastening device for a portable work machine as described in claim 4, characterized in that the stopper mechanism comprises a stopper member protruding from the side wall of the recess, which abuts against the fastening device main body at least in the deployed state to restrict rotation of the fastening device main body.

6. The fastener body is attached to the crosspiece having a pair of vertical surfaces, A retractable fastening device for a portable work machine as described in claim 4, characterized in that the width of the engagement groove is formed to be approximately the same as the distance between the pair of vertical surfaces of the cross bar within a range that allows the cross bar to be inserted, thereby forming the stopper mechanism to restrict the rotation of the fastening device main body.

Images