Work safety device of tailgate lifter and motor truck with work safety device

Abstract

To develop a work safety device of a tailgate lifter and a work safety device equipped with a tailgate lifter that can ensure safety of an operator on a lifter deck surface in a deployed state without performing direct machining on the tailgate lifter.SOLUTION: A work safety device S of the present invention includes either or both of a safety belt device 6 and a guard frame device 5, of which the safety belt device 6 connects a belt support material 60 installed on a load-carrying platform 1 to a safety belt 61 worn on the body of a worker M by a belt body 64 to prevent the worker M from falling, and the guard frame device 5 is configured such that a guard frame 54 freely moved and installed from an inner surface of a rear part of a cargo compartment 1R is attached so as to extend up to the upper side of a lifter deck 21 in a deployed state, thereby preventing the worker M from falling.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a tailgate lifter work safety device for ensuring the safety of cargo handling workers on a tailgate lifter (lifter deck) provided at the rear of the luggage compartment of a freight vehicle, for example, and to a freight vehicle equipped with a work safety device. [Background technology]

[0002] From the viewpoint of occupational safety, many safety measures have been established as laws and regulations for working at height. These regulations for safety measures are aimed at ensuring occupational safety more broadly, and for example, measures are being called for to ensure the safety of workers when handling cargo on the tailgate lifter (on the deployed lifter deck) that is equipped on freight vehicles that are 1 to several tens of centimeters above the ground. In response to such demands, vehicles are already available on the market in Europe that are equipped with a safety frame on the deck surface (lifter deck surface) of the tailgate lifter, which uses the side edges of the deck surface as hinges and can be raised freely from a flat position along the side edges of the deck surface (see, for example, Patent Document 1). However, there are roughly four types of tailgate lifters: underfloor storage type, rear storage type, vertical lift type, and arm type, as shown in Figure 6. Of these, the underfloor storage type has a structure in which the lifter deck is folded and stored under the rear of the cargo area when the tailgate lifter, which can be raised and lowered, is not in use, making it difficult to separately equip the lifter deck itself with a safety frame, etc. Furthermore, while it is not impossible to originally equip the lifter deck of a tailgate lifter with current specifications with a separate safety frame, etc., structural constraints to avoid interference with surrounding components are unavoidable. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7208599 [Patent Document 2] Japanese Patent Publication No. 2020-138723 Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention was made taking into consideration the above background, and its technical objective was to develop a work safety device for a tailgate lifter and a freight vehicle equipped with a work safety device that ensures the safety of workers on the lifter deck surface of the tailgate lifter without any direct processing on the tailgate lifter. [Means for solving the problem]

[0005] That is, the tailgate lifter work safety device according to claim 1 is A work safety device for ensuring the safety of workers during cargo handling work performed on the lifter deck of a tailgate lifter that is installed in a retractable and deployable manner at the rear of the loading platform of a freight vehicle, This work safety device is comprised of either or both of a safety belt device and a guard frame device, The safety belt device prevents workers from falling by connecting a belt support material installed on the loading platform to a safety belt worn on the worker's body with the belt body. The guard frame device is characterized by the fact that a guard frame that can be freely moved and installed from the inner surface of the rear of the cargo compartment is attached so that it extends above the side of the unfolded lifter deck, preventing workers from falling.

[0006] The tailgate lifter work safety device according to claim 2 has, in addition to the requirements of claim 1, The safety belt device has a belt support provided along an upper beam of a rear gate frame at the rear end of the loading platform, The safety belt device is also an emergency lock type with a tendency to wind loosely, and is characterized by the fact that the length of the belt body connecting the belt support to the worker side is always adjusted to be an appropriate length, and the unwinding of the belt body is locked in the event of an impact pull-out.

[0007] The tailgate lifter work safety device according to claim 3 has, in addition to the requirements of claim 1 or 2, The guard frame device comprises a receiving member attached to the rear of the bed of the truck, and a separate guard frame held by the receiving member, The guard frame is characterized in that it is disposed above and along the side edge of the deployed lifter deck while being held by the receiving member.

[0008] The tailgate lifter work safety device according to claim 4 has, in addition to the requirements of claim 3, A member for extending the extension length of the guard frame device is provided between the receiving member and the guard frame.

[0009] The tailgate lifter work safety device according to claim 5 has, in addition to the requirements of claim 3, The receiving member is characterized in that it can be attached to and detached from a lashing rail provided on the wall surface of the luggage compartment of a truck.

[0010] Furthermore, a freight vehicle equipped with a work safety device according to claim 6 comprises: A freight vehicle having a loading platform behind the driver's cab, This freight vehicle is equipped with a work safety device that ensures the safety of workers during either or both of loading and unloading work performed on the loading platform or on the lifter deck of the tailgate lifter provided at the rear of the loading platform, The work safety device comprises either or both of a safety belt device and a guard frame device, The safety belt device connects the belt support material installed on the loading platform to the safety belt worn by the worker with the belt body to prevent the worker from falling. The guard frame device is characterized by the fact that a guard frame that can be freely moved and installed from the inner surface of the rear of the cargo compartment is attached so that it extends above the side of the unfolded lifter deck, preventing workers from falling.

[0011] Furthermore, the freight vehicle equipped with the work safety device according to claim 7 has, in addition to the requirements of claim 6, The guard frame device comprises a receiving member attached to the rear of the bed of the truck, and a separate guard frame held by the receiving member, The guard frame is characterized in that it is disposed above and along the side edge of the deployed lifter deck while being held by the receiving member.

[0012] Furthermore, the freight vehicle equipped with the work safety device according to claim 8 has, in addition to the requirements of claim 6, The safety belt device has a belt support member provided along the rear end or side end of the cargo bed, The belt support member has a ring-shaped member fitted loosely onto its outer surface, and the take-up case of the safety belt device is suspended from the ring-shaped member. The above problems are solved by the means described in each claim. [Effects of the Invention]

[0013] First, according to the invention described in claim 1, the work safety device for safely performing cargo handling operations on a tailgate lifter (lifter deck) can be installed on any type of tailgate lifter without any special processing or modification to the tailgate lifter. In other words, a tailgate lifter (lifter deck) that requires a separate guard frame to be erected on its side edge could not be installed on an underfloor storage tailgate lifter. This is because underfloor storage tailgate lifters are stored under the floor behind the cargo bed while the vehicle is in motion, and are therefore considered a component of the vehicle's bumper. Adding a separate component (such as a guard frame) to the tailgate lifter itself is illegal (illegal modification) and therefore not possible. However, since the present invention can be applied to such underfloor storage tailgate lifters, the work safety device can be installed on a variety of tailgate lifters.

[0014] Furthermore, according to the invention described in claim 2, a retractable fall prevention device is used as the safety belt device, so that the worker can concentrate on loading and unloading work on the tailgate lifter (lifter deck), and even if he or she is about to fall, this can be reliably avoided.

[0015] According to the invention of claims 3 and 7, the guard frame device has a receiving member for holding the guard frame, so that the receiving member can be permanently installed on the inside rear part of the loading platform, and the separate guard frame can be fitted into the receiving member only when loading and unloading work is performed using the tailgate lifter. This means that the guard frame does not get in the way when not performing loading and unloading work.

[0016] According to the invention of claim 4, a member for extending the overhanging length of the guard frame device is separately provided, so that even a lifter deck (tailgate lifter) that is long in the front-to-rear direction when unfolded can be accommodated by adding the extension member. Furthermore, since the basic receiving member and guard frame are reused to extend the overhanging length of the guard frame device, these basic members can be used efficiently and effectively.

[0017] Furthermore, according to the invention described in claim 5, since the receiving member is attached to the lashing rail, even if the freight vehicle is a vehicle that uses insulation, such as a refrigerated truck or a refrigerator truck, the receiving member can be attached to the vehicle side without damaging the insulation, and the original insulation and refrigeration functions can be maintained. Furthermore, since the receiving member can be attached and detached freely, it is easy to attach and detach the receiving member, and it can be easily adapted to situations such as when you want to change the attachment position or when you want to use the lashing rail's locking slits for other purposes.

[0018] Furthermore, according to the invention described in claim 6, the safety of workers can be reliably ensured when performing loading and unloading work on the loading platform or the lifter deck of a tailgate lifter (workers can be reliably prevented from falling from the loading platform or tailgate lifter).

[0019] According to the invention of claim 8, the annular member is loosely fitted onto the belt support member provided along the rear or side edge of the loading platform, so that the winding case suspended by this member can freely move (slide) along the belt support member, rubbing against the belt support member. Therefore, even if a worker moves during loading and unloading work, the winding case (safety belt device) can move along with the worker's movement, so that the belt body of the safety belt device does not interfere with the loading and unloading work, allowing the worker to carry out the work smoothly. Of course, the fact that the winding case can move freely along the rear or side edge of the loading platform as the worker moves means that the length of the belt body unwound from the winding case is kept at approximately the shortest distance, reliably preventing the worker from falling. [Brief explanation of the drawings]

[0020] [Figure 1] 1A is a perspective view showing a guard frame device, which is an example of a work safety device (work safety device for a tailgate lifter) according to the present invention, installed on a freight vehicle, and FIG. 1B is an exploded perspective view showing an enlarged view of the guard frame device. [Figure 2] 1 is a perspective view showing, from the rear, an example of a freight vehicle (wing type) to which the work safety device of the present invention is attached. [Figure 3] This is an oblique view (a) showing the state in which both a safety belt device and a guard frame device are installed as work safety devices at the rear of the luggage compartment, and a side view (b) showing the state in which loading and unloading work is performed on a tailgate lifter using this safety belt device. [Figure 4] 1A and 1B are side views showing an example of a configuration for extending the rearward extension length of a guard frame device, with (a) showing the components in an exploded state and (b) showing them in an assembled state. [Figure 5] FIG. 1(a) is an explanatory diagram of a lashing rail installed in the fore-and-aft direction in the luggage compartment of a freight truck, viewed from the front of the rail, and FIG. 1(b) is a longitudinal cross-sectional view showing a fixing bracket that can be attached and detached to the lashing rail with a one-touch operation, when the fixing bracket is attached to the lashing rail. [Figure 6] 1A to 1C are explanatory diagrams showing four types of tailgate lifter structures from the side of a vehicle. DETAILED DESCRIPTION OF THE INVENTION

[0021] The present invention is as shown in the following examples, but it is possible to make appropriate modifications to these examples within the scope of the technical concept of the present invention. [Example]

[0022] Below, we will explain in detail the tailgate lifter work safety device S (hereinafter sometimes simply abbreviated as work safety device S) of the present invention, but before explaining the work safety device S, we will first provide an overview of the freight vehicle V to which this device is applied. As shown in Fig. 1(a) as an example, a freight vehicle V has a loading platform 1 behind the driver's cab (driver's seat), and the loading platform 1 may be a trailer type. This loading platform 1 has a floor surface 11 provided on the chassis of the freight vehicle as a base member, and is equipped with a loading platform frame 12 to ensure the necessary strength. The loading platform frame 12 comprises a floor frame 12a around the floor surface 11, and further comprises a front wall frame 12b at the front and a rear gate frame 12c at the rear, which are in an upright position, as shown in Figure 2, for example, and a top frame 12d that connects the top centers of the front wall frame 12b and the rear gate frame 12c.

[0023] On both sides of the freight vehicle V, side gates 13 are hingedly connected to the floor frame 12a, and wing panels 14 are supported on the top frame 12d so that they can be opened and closed like wings (see Figure 2). Each of the left and right wing panels 14 has an L-shaped cross section, and is made up of a wing top surface 14a that forms a roof portion and wing side surfaces 14b that are formed continuously and at approximately right angles to the wing top surface 14a. The edge of the wing top surface 14a on the rotation base side is rotatably connected to the top frame 12d as a support member. On the other hand, the lower edge of the wing side surface 14b is configured to abut against the upper edge of the side gate 13 in the raised state when in the closed state, covering the cargo bed 1 in this state and defining a sealed cargo compartment 1R inside (the so-called cargo box).

[0024] Furthermore, lashing rails 15 are provided on the inner surfaces of the side gates 13 and wing panels 14, which face the luggage compartment 1R. As shown in FIG. 2 above, these lashing rails 15 are used to secure luggage W loaded on the loading platform 1, and are provided in continuous rows in the longitudinal direction of the loading platform 1. In particular, in this embodiment, two upper and lower rows of lashing rails 15 are provided on each of the inner surfaces (left and right sides) of the loading platform 1. That is, first, upper lashing rails 15A are continuously arranged in the front-rear direction at appropriate positions in the vertical direction on the wing side surfaces 14b of the wing panels 14, and lower lashing rails 15B are similarly arranged at appropriate positions near the upper end of the side gates 13.

[0025] The lashing rail 15 itself is well known, and as an example, as shown in Figure 5(a), a number of locking slits 15S are formed so that they all face up and down (in the shape of vertical stripes, so to speak), and the fixing metal fittings 41 of the lashing belt 4 are locked onto these slits to secure the luggage W. Of course, various configurations are possible for arranging the locking slits 15S in the lashing rail 15. For example, it is also possible to provide cross-hole-shaped locking slits 15S, in which the above-mentioned locking slits 15S are arranged vertically and horizontally, between the above-mentioned vertical strip-shaped locking slits 15S. In other words, this configuration is a lashing rail 15 in which cross-hole-shaped locking slits 15S and vertical strip-shaped locking slits 15S are arranged alternately. In this case, the fixing metal fittings 41 can also be attached to the cross-hole-shaped locking slits 15S in either a vertical or horizontal position according to the hole shape, and the fixing metal fittings 41 can be fixed to the lashing rail 15 in a more appropriate direction and position.

[0026] Furthermore, a rear door 16 that closes the rear of the luggage compartment 1R is provided at the rear of the loading platform 1 so as to have, for example, a double door configuration. In this case, the rear door 16 is provided so as to be hinged to a post portion (side pillar portion) of the rear gate frame 12c. Further, near the upper beam of the rear gate frame 12c, a belt support member 60 constituting a safety belt device 6, which is another work safety device S, is provided (this will be described later).

[0027] A tailgate lifter 2 for cargo handling is installed at the rear of such a general freight vehicle V. This tailgate lifter 2 is provided at the rear of the loading platform 1 so as to be freely storable and deployable, and includes a lifter deck 21 that lifts and lowers cargo W thereon, and a lifting shifter (not shown) that handles the lifting and lowering operations of the lifter deck 21 and the storage and deployment operations. The tailgate lifter 2 is also a well-known structure, so a detailed description will be omitted. However, as an example, as shown in FIG. 6, the tailgate lifter 2 can be broadly divided into the following parts: (1) Underfloor retractable tailgate lifter 2A (2) Rear retractable tailgate lifter 2B (3) Vertical lifting tailgate lifter 2C (4) Arm-type tailgate lifter 2D Four types are widely used. In particular, the underfloor storage type tailgate lifter 2A of (1) is popular because the tailgate lifter 2A can store the lifter deck 21 itself in a folded state, such as folded in half or in three, under the rear of the loading platform, and can therefore be parked facing backwards on the platform of a large-scale loading and unloading facility where many freight vehicles V gather.

[0028] In carrying out the loading and unloading work, a loading and unloading vehicle P, which is a so-called roll box pallet or a basket vehicle, as shown in FIG. 3(a), is often used. The lashing belt 4 described above is used to secure the loading cart P (loading cart P carrying cargo W) loaded onto the loading platform 1, and as shown in Figure 2 as an example, this lashing belt 4 is made up of two belt bodies 40. One of the belt bodies 40 has a fixing metal fitting 41 attached to one end for engaging with the lashing rail 15, and a cargo tie-down device 42 attached to the other end. The other belt body 40 has a fixing metal fitting 41 attached to only one end, and nothing attached to the other end, and this other end is ultimately wound up around the cargo tie-down device 42, applying strong tension to the belt body 40.

[0029] That is, when securing a loading cart P carrying cargo W within the luggage compartment 1R, for example, first, one end of the belt body 40, which has a cargo tie-down device 42 attached to the other end, is attached to the locking slit 15S of the lashing rail 15 by means of a fixing metal fitting 41. Here, the fixing metal fitting 41 is attached to the locking slit 15S by inserting it with a so-called one-touch operation using the locking slit 15S of the lashing rail 15, and can be attached so as to be freely engaged and disengaged. Thereafter, the fixing metal fitting 41 of the other belt body 40 (the belt body 40 without the cargo tie-down device 42 attached) is engaged with the engagement slit 15S of the opposite lashing rail 15. Then, the other end side of this belt body 40 (the other end side with nothing attached) is attached so as to be wrapped around a predetermined portion of the cargo tie-down device 42, and the wrapping and tightening are performed by the cargo tie-down device 42. This applies appropriate tension to the belt body 40 hung around the cargo handling cart P (cargo W), and the cargo handling cart P is firmly fixed within the luggage compartment 1R.

[0030] The one-touch mounting of the fixing metal fittings 41 will be further explained below. 5(b), the fixing metal fitting 41 comprises a metal fitting main body 43, a stopper 44 rotatably attached to the metal fitting main body 43, a rotation fulcrum 45 of the stopper 44, and an elastic body 46 such as a spring for biasing the stopper 44 in the locking direction, and the stopper 44 is rotatably attached to the metal fitting main body 43 by the rotation fulcrum 45 formed by a caulking pin or the like. The stopper 44 is configured so as to always abut against a base portion 431 of the metal fitting main body 43 by the biasing force of the elastic body 46, and the portion of the stopper 44 that abuts against the base portion 431 is called a separation prevention portion 441. The separation prevention portion 441 is configured so that the upper portion of the stopper 44 (the upper portion in FIG. 5(b)) can be operated to open against the bias of the elastic body 46, and this portion of the stopper 44 is referred to as the operating portion 442. Also, a contact portion 443 that protrudes outward (toward the lashing rail 15) is formed in the stopper 44 slightly below the operating portion 442, and this is for the purpose of opening the stopper 44 without actively operating the operating portion 442 by bringing the contact portion 443 into contact with the lashing rail 15 when locking the fixing bracket 41. Furthermore, the metal fitting body 43 has a base portion 431 having a longitudinal dimension larger than the longitudinal opening dimension (vertical direction) of the locking slit 15S. A groove 432 is formed in the lower part (lower part in FIG. 5(b)) of the metal fitting body 43, and a deeper groove 433 is formed in the upper part thereof, with the dimension between these two grooves being smaller than the longitudinal opening dimension of the locking slit 15S. Furthermore, the vertically elongated opening formed on the opposite side of the base portion 431 in the metal fitting body 43 is a belt hole 434 for passing the lashing belt 4 (belt body 40) through and fastening it to the metal fitting body 43.

[0031] To attach such a fixing metal fitting 41 to the locking slit 15S of the lashing rail 15, the metal fitting body 43 is tilted forward (the upper part of the metal fitting body 43 is tilted forward in FIG. 5), and the upper part of the base part 431 is inserted into the upper inside part of the locking slit 15S while the contact part 443 of the stopper 44 is abutted against the lashing rail 15 (the part located above the locking slit 15S). At this time, since the insertion work is performed while the contact part 443 of the stopper 44 is abutted against the lashing rail 15 as described above, the stopper 44 rotates so that the separation prevention part 441 moves away from the base part 431 against the bias of the elastic body 46, without the operator M actively manually operating the operating part 442, and the insertion work can be performed smoothly. During the insertion operation, the upper groove portion 433 of the metal fitting body 43 is fitted into the lower edge of the upper opening of the locking slit 15S, and then the lower portion of the metal fitting body 43 is rotated so that the metal fitting body 43 (base portion 431) assumes an approximately vertical position (vertical position in Figure 5(b)). By this rotation, the base portion 431 can penetrate the locking slit 15S and be accommodated inside the locking slit 15S, even though the base portion 431 is formed to have dimensions larger than the longitudinal opening dimension of the locking slit 15S.

[0032] Thereafter, the metal fitting body 43 is lowered downward so that the lower groove 432 of the metal fitting body 43 fits into the upper edge of the lower opening of the locking slit 15S (downward in FIG. 5(b)). By this operation, the contact portion 443 of the stopper 44 is released from contact with the lashing rail 15, and therefore the detachment prevention portion 441 of the stopper 44 rotates under the bias of the elastic body 46 so as to abut against the base portion 431, thereby maintaining the attached state. In other words, the stopper 44 rotates under the bias of the elastic body 46, so that the detachment prevention portion 441 abuts against the lower edge of the upper opening of the locking slit 15S, and the attached state of the fixing metal fitting 41 is maintained. It should be noted that with regard to directions in the above explanation (such as the direction when installed), expressions such as "upper" and "lower" refer solely to directions based on Figure 5(b). For example, when the locking slit 15S of the lashing rail 15 is formed in a cross-hole shape and the fixing bracket 41 is installed therein in a horizontal position (laying down), for example, "upper" in the above explanation should be read as "rear of the loading platform" or the like. Incidentally, such a fixing metal fitting 41 is already known, and details thereof are disclosed in, for example, Japanese Patent Application Laid-Open No. 2016-138562.

[0033] The functional members relating to the loading platform 1 of the freight vehicle V and the tailgate lifter 2 have been described above, but the work safety device S during loading and unloading work on the tailgate lifter 2 will now be described. The main purpose of the work safety device S of the present invention is to prevent a worker M from falling while performing cargo handling work on the tailgate lifter 2 or loading platform 1. To this end, the work safety device S is equipped with either or both of a safety belt device 6 and a guard frame device 5. Of these, the safety belt device 6 prevents the worker M from falling by connecting a belt support material 60 installed on the loading platform 1 to a safety belt 61 (fall arrest device) worn around the body of the worker M with a belt main body 64, and the guard frame device 5 has a guard frame 54 that can be moved and installed from the inner surface of the rear part of the cargo compartment 1R and is attached so as to protrude above the side of the lifter deck 21 deployed on the tailgate lifter 2, thereby preventing the worker M from falling from the lifter deck 21. However, the most significant feature of the work safety device S of the present invention is that, whether it is the guard frame device 5 or the safety belt device 6, the support part of the work safety device S, that is, in the case of the guard frame device 5, the part that supports and fixes the guard frame 54, and in the case of the safety belt device 6, the support part from which the safety belt 61 is ultimately hung, is installed on the loading platform 1 side, which is the vehicle body side, and no additional processing or modification is required for the tailgate lifter 2 itself. The guard frame device 5 and the safety belt device 6 will be described below.

[0034] The guard frame device 5 has a receiving member 51 as a fixed member on the loading platform 1 side, and as shown in Figure 1(b) as an example, this receiving member 51 is a support member for a guard frame 54 described later, and is composed of a base body 52 and a frame holder 53 attached to it. That is, the base body 52 is basically a simple flat plate-like member, and is detachably attached to, for example, two upper and lower rows of lashing rails 15 installed on the inner surface of the loading platform 1 (luggage compartment 1R), and the frame holders 53 are attached to the two upper and lower mounted base bodies 52. Note that the method of attaching the fixing metal fittings 41 described above can be used to detachably attach the base bodies 52 to the lashing rails 15. The frame holder 53 is a socket-type pipe-like member into which the guard frame 54 is inserted and held in a fitted manner. The frame holder 53 is often formed in the shape of a short cylindrical pipe or a short rectangular pipe, and this shape is determined appropriately depending on the guard frame 54 to be fitted therein. Of course, the frame holder 53 does not necessarily have to be pipe-shaped (tubular), and it can also be formed in the shape of a solid, short rod into which the guard frame 54 is fitted and held in a fitted manner. It is preferable to form a retaining notch 53a in the frame holder 53 facing toward the rear of the vehicle body (see Figure 1 (b)), and by attaching the guard frame 54 so that the insertion portion 56 drops into this retaining notch 53a, the entire guard frame 54 can be prevented from rotating after attachment.

[0035] Next, the guard frame 54 held by the receiving member 51, that is, the base body 52 and the frame holder 53, will be described. 1(b) above, guard frame 54 is formed as a separate body from receiving member 51, and includes guard extension portion 55 formed in a horizontal U-shape when viewed from the side, and insertion portion 56 formed at its end. Note that it is preferable that horizontal U-shaped guard extension portion 55 has two straight rod portions that form the parallel parts of the horizontal U-shape connected at approximately the middle (this is called connector 55a) to reinforce U-frame-shaped guard extension portion 55. When actually using such a guard frame device 5, first operate the operation buttons of the tailgate lifter 2 located at the rear of the cargo bed of the freight vehicle V to raise the lifter deck 21 of the tailgate lifter 2 to a height approximately halfway between the ground and the floor surface 11 (floor surface 11 of the cargo bed 1), then use this as a step to climb from the ground to the rear of the cargo bed 1, remove the guard frame 54 from an appropriate storage location within the cargo compartment 1R, and insert the insertion portion 56 of the guard frame 54 into the frame holder 53 of the receiving member 51 in an internally fitted state to secure it. When fixing, as described above, the guard expansion portion 55 is positioned and held above the side edge of the lifter deck 21 by fitting the insertion portion 56 of the guard frame 54 into the holding notch 53a, thereby preventing the entire guard frame 54 from rotating after installation and maintaining the expanded state.

[0036] Thereafter, the loading and unloading work is performed by moving the tailgate lifter 2 upward or downward depending on the type of work, i.e., whether loading or unloading the cargo W. During this work, the guard frame 54 is provided to extend from the rear of the loading platform to above the side edge of the tailgate lifter 2, preventing accidents such as the worker M falling off the deck surface and the loading cart P falling off. In addition, the tailgate lifter 2 has a difference in the front-to-rear length of the lifter deck 21 (front-to-rear length when deployed) depending on the size of the vehicle, etc., and it is conceivable that the above-mentioned guard frame 54 alone may not have an operating length that reaches up to the upper rear part of the lifter deck 21. Taking such cases into consideration, the guard frame device 5 can be provided with an adapter 57 and a connecting extension body 58 that extend the operating length of the guard frame device 5 between the receiving member 51 and the guard frame 54, as shown in Figure 4 as an example. The adapter 57 is formed to have a short T-shape overall, and comprises a vertical insertion portion 57a formed in the vertical direction and a horizontal insertion socket 57b formed in the horizontal direction (front-to-rear direction of the vehicle), which are formed, for example, from pipe-shaped members.

[0037] On the other hand, the connecting extension body 58 used with this adapter 57 is composed of a single pipe-shaped member arranged mainly horizontally, with a connecting insertion part 59 provided at one end in the up-down direction, i.e., vertical direction, which functions in the same way as the frame holder 53 in Figure 1(b) above. The insertion part 56 of the guard frame 54 is combined with this connecting insertion part 59 in a vertically fitted manner. In actual assembly, first, the vertical insertion portion 57a of the short T-shaped adapter 57 is fitted into the frame holder 53 of the receiving member 51, and one end of the pipe-shaped connecting extension body 58 is fitted into the horizontal insertion socket 57b. In this state, the insertion portion 56 of the guard frame 54 is fitted from above into the connecting insertion portion 59, which is in an up-and-down position. Furthermore, by adopting this type of extension of the operating length, the basic components, the receiving member 51 and guard frame 54, can be used in common for any tailgate lifter 2, and even if the operating length differs, it can be adjusted using only the adapter 57 and connecting extension body 58, which is extremely rational.

[0038] In the above-described embodiment, the receiving member 51 in the guard frame device 5 is basically attached not to the inside of the post portion of the rear gate frame 12c, but to the lashing rail 15 provided on the inner wall surface of the luggage compartment 1R. This is because, when the freight vehicle V to be fitted is a refrigerated vehicle or a freezer vehicle, the entire cargo compartment 1R is insulated, and the rear gate frame 12c also has insulation material stretched on the inside, so there was concern that if the receiving member 51 were to be placed directly on this rear gate frame 12c, it would damage the insulation material and impair the insulation performance. Therefore, if the luggage compartment 1R or the rear gate frame 12c is not thermally insulated, it is also possible to attach the receiving member 51 to the inside of the post portion of the rear gate frame 12c. In this case, the attachment of the receiving member 51 to the rear gate frame 12c does not need to follow the one-touch connection described above (because the attached portion is not the lashing rail 15), and any appropriate fastening means such as bolts and nuts can be used.

[0039] Next, the safety belt device 6 will be described. As shown in Fig. 3 as an example, the safety belt device 6 connects a belt support 60 installed on the loading platform 1 to a safety belt (fall arrest device) 61 of a worker M performing loading and unloading work on the lifter deck 21, for example, to prevent the worker M from falling. Therefore, when the safety belt device 6 is applied as the work safety device S, the worker M needs to put on the safety belt 61 in advance. Here, the safety belt 61 consists of a waist belt and a lanyard, but if the safety belt 61 is a full harness type, a harness belt will also be added in addition to the waist belt. In addition, in Figure 3, since it is assumed that loading and unloading work will be carried out on the lifter deck 21 at the rear of the loading platform, the belt support material 60 is installed across the width of the vehicle so as to follow the upper beam of the rear gate frame 12c. A ring-shaped member 62 such as an oval can is fitted loosely onto the belt support material 60 in advance, so that the ring-shaped member 62 (and thus the winding case 63 described later) can move (slide) along the belt support material 60 in the vehicle width direction while rubbing against it. The safety belt device 6 is attached in a suspended state using this annular member 62. The annular member 62 is configured to be movable in the vehicle width direction so that the worker M can move freely on the lifter deck 21, and thus the free loading and unloading work on the lifter deck 21 is not hindered.

[0040] It is also preferable to use a safety belt device 6 called a "retractor-type fall arrest device" that has a fixed length and can be freely wound up and pulled out. In this device, a belt body 64 of a fixed length is stored in a wound state inside a winding case 63, and the attachment part (vehicle-side attachment part) of the winding case 63 is connected to the annular member 62 via a carabiner 65. On the other hand, a belt hook 66 is provided at the leading end of the belt body 64 inside the winding case 63, and this belt hook 66 is engaged with a carabiner or the like for connection to the safety belt 61 worn by the worker M. The belt body 64 is always adjusted to an appropriate length, and if a certain acceleration occurs, such as when pulling out with an impact, that is, if an accident such as a fall of the worker M occurs, this is detected and a braking action such as a safety ratchet mechanism is applied to prevent the belt body 64 from being pulled out any further, thereby preventing the worker M from falling. This mechanism itself has the same structure as a seat belt used in an automobile. The safety belt device 6 having this structure is sometimes called an "emergency lock type safety belt with a loose winding tendency." Furthermore, as the worker M moves during loading and unloading work, the winding case 63 can move freely along the rear end or side end of the loading platform 1, which means that the length of the belt body 64 unwound from the winding case 63 is maintained at approximately the shortest distance, thereby reliably preventing the worker M from falling (stumbling). Incidentally, when performing loading and unloading operations on the lifter deck 21 of the tailgate lifter 2, applying both the guard frame device 5 and the safety belt device 6 as the work safety device S makes it possible to perform loading and unloading operations more safely (see Figure 3(a)).

[0041] In addition, the safety belt device 6 can be used not only to prevent falls during loading and unloading operations on the tailgate lifter 2 (lifter deck 21), but also to prevent workers M from falling (falling off the side of the loading platform 1) while performing loading and unloading operations on the loading platform 1. Specifically, for example, a worker M may perform cargo handling work on a loading platform 1 with the wing side surface 14b of the wing panel 14 open. In this case, the belt support material 60 is provided on the side edge of the loading platform 1, for example, between the floor frame 12a and the rear gate frame 12c along the top frame 12d, and by configuring the safety belt device 6 in the same manner as above except for this, the worker M can be prevented from falling off the side of the loading platform 1. Furthermore, if the freight vehicle V equipped with the loading platform 1 is a flatbed, for example, by installing a belt support material 60 similar to that described above on the loading platform 1, i.e., a belt support material 60 along the longitudinal direction (front-to-back direction) of the loading platform 1, it is possible to prevent the worker M from falling off the side of the loading platform 1. [Explanation of symbols]

[0042] V lorry S Work safety device (work safety device for tailgate lifter) 1 Cargo bed 1R luggage compartment 2 Tailgate lifter 2A Underfloor retractable tailgate lifter 2B Rear retractable tailgate lifter 2C Vertical lifting tailgate lifter 2D arm tailgate lifter 4 Lashing belts 5 Guard frame device 6 Safety belt device 11 Floor 12 Cargo frame 12a Floor frame 12b Front wall frame 12c rear gate frame 12d top frame 13 Side tilt 14 Wing Panel 14a Wing top 14b Wing side 15 Lashing rail 15A Upper lashing rail 15B Lower lashing rail 15S Locking slit 16 Rear door 21 Lifter deck 40 Belt body 41 Fixing bracket 42 Cargo tie 43 Metal fittings body 44 Stopper 45 pivot point 46 Elastic Body 431 Base 432 Groove (downward) 433 Groove (upper) 434 Belt hole 441 Anti-detachment unit 442 Operation section 443 Hitting part 51 Receiving member 52 Base body 53 Frame holder 53a Retention cutout 54 Guard Frame 55 Guard deployment section 55a Connector 56 Insertion part 57 Adapter 57a Vertical insertion part 57b Horizontal insertion socket 58 Connected Extension 59 Connecting insertion part 60 Belt support material 61 Safety belt (fall arrest device) 62 Annular member 63 Winding case 64 Belt body 65 Carabiner 66 Belt hook M worker P Loading cart Double Luggage

Claims

1. A work safety device for ensuring the safety of workers during cargo handling work performed on the lifter deck of a tailgate lifter that is retractable and deployable at the rear of the loading platform of a freight vehicle, This work safety device is comprised of either or both of a safety belt device and a guard frame device, The safety belt device prevents workers from falling by connecting a belt support material installed on the loading platform to a safety belt worn on the worker's body with the belt body. The guard frame device is a work safety device for a tailgate lifter, characterized in that the guard frame is movable and installable from the inner surface of the rear of the cargo compartment so that it extends above the side of the unfolded lifter deck, preventing workers from falling.

2. The safety belt device has a belt support provided along an upper beam of a rear gate frame at the rear end of the loading platform, The safety belt device is an emergency lock type that has a tendency to be wound loosely, and the length of the belt body connecting the belt support to the worker side is always adjusted to be an appropriate length, and the payout of the belt body is locked in the event of an impact pull-out. This is a work safety device for a luggage tailgate lifter as described in claim 1.

3. The guard frame device comprises a receiving member attached to the rear of the bed of the truck, and a separate guard frame held by the receiving member, 3. The tailgate lifter work safety device according to claim 1, wherein the guard frame is positioned above and along the side edge of the deployed lifter deck while being held by the receiving member.

4. 4. The tailgate lifter operation safety device according to claim 3, wherein a member for extending the extension length of the guard frame device is provided between the receiving member and the guard frame.

5. 4. The tailgate lifter operation safety device according to claim 3, wherein the receiving member is attached so as to be freely engaged with and detached from a lashing rail provided on a wall surface of a luggage compartment of a truck.

6. A freight vehicle having a loading platform behind the driver's cab, This freight vehicle is equipped with a work safety device that ensures the safety of workers during either or both of loading and unloading work performed on the loading platform or on the lifter deck of the tailgate lifter provided at the rear of the loading platform, The work safety device comprises either or both of a safety belt device and a guard frame device, The safety belt device connects the belt support material installed on the loading platform to the safety belt worn by the worker with the belt body to prevent the worker from falling. The guard frame device is a movably installed guard frame attached to the inner surface of the rear of the cargo compartment so as to extend above the side of the deployed lifter deck, thereby preventing workers from falling.

7. The guard frame device comprises a receiving member attached to the rear of the bed of the truck, and a separate guard frame held by the receiving member, 7. A freight vehicle equipped with a work safety device according to claim 6, wherein the guard frame is positioned above and along the side edge of the deployed lifter deck while being held by the receiving member.

8. The safety belt device has a belt support member provided along the rear end or side end of the cargo bed, 7. A freight vehicle equipped with a work safety device according to claim 6, wherein an annular member is loosely fitted onto the belt support member, and a take-up case of the safety belt device is suspended from the annular member.

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