JP4852691B2 - Middle waist work assist device - Google Patents

Description

  The present invention relates to a middle waist work assisting device suitable for use when a worker has to work in a middle waist posture, for example, in strawberry cultivation work, other agricultural work, horticultural work, or civil engineering work.

  Agricultural work and horticultural work involve a task of forcing the operator to have a lower back posture, which is a physical burden that hurts the operator's lower back and knees, and there is a problem that work efficiency decreases. In particular, the greenhouse house has a problem that the middle waist posture is often imposed because the work space is limited, and that the posture of the middle waist posture is heavy because workers are getting older.

Conventionally, as a technique for reducing the physical burden on an operator during work, a luggage placement section 2 that holds a luggage, a shoulder mounting section 3 that extends from the luggage placement section 2 and is hung on a shoulder, and the luggage A waist mounting portion 4 provided at the lower portion of the mounting portion 2 and wound around and fixed to the waist, and a support leg portion 6 extending from the waist mounting portion 4 to the ground 5 and bending in conjunction with the movement of the foot. A work auxiliary tool has been proposed (Patent Document 1).
JP 2000-16539 A

  However, the above-described work assisting tool of the prior art is intended to prevent a person from being burdened with the load carried on the back, and does not reduce the burden during the middle waist posture. Recently, with the development of robot technology, auxiliary devices that can support heavy objects with a small force or auxiliary devices for walking have been proposed, but most of them are called robot suits. Since it is attached to almost the whole body of the operator, it is troublesome to wear and takes time, and it is not overly functional because it is not mainly intended for assistance during middle waist work, and the weight is also There is a drawback that the device is expensive.

  In particular, in strawberry cultivation, back pain is a major problem for workers because more than half of the total work time is middle waist work, but other farm work also has similar problems. However, no auxiliary device has been proposed that is easy to handle, such as wearing, and that reduces the burden on the worker as much as possible by assisting the lower back work in more specific work such as farming, horticultural work or civil engineering work. is the current situation.

  The present invention has been made in view of the above-mentioned unresolved problems of the prior art, and is easy to wear and use, and reduces the load on the waist of the middle waist worker as much as possible. Accordingly, it is an object of the present invention to provide a middle waist work assisting device that can reduce the occurrence of physical obstacles due to middle waist work and can improve work efficiency.

Means of the present invention configured in order to solve the problems described above, prior to forming so as not affected by the operator's back, which pushed out backward flexion, a support for mounting on the rear of the operator, the support of provided in the lower side, Seung load bearing a load applied via the load transmission mechanism having an operating lever made so as to nest with the elastic body of the elastic force mechanism of action with the movement of the thigh of the operator a mechanism body, said support and removably provided on the support and load bearing Seung mechanism in order to mount the load bearing approval mechanism to the operator, the buttocks and thighs back from the acting skill shoulder The load receiving mechanism body includes a casing connected to the support body and a support shaft along the longitudinal direction in the cylindrical portion of the casing. And a pair of left and right elastic bodies are spaced apart along the support shaft The elastic force of each elastic body is configured to act in the axial direction, and the movement of the left and right thighs during the walking of the operator is transmitted to the casing through the load transmission mechanism. An elastic force acting mechanism that is housed in an axially displaceable manner, and a pair of left and right rope winding drums that are pivotally supported in the casing so as to be pivotable in sections. A load transmission mechanism that connects an operating rod linked to the movement of the thigh and applies a load to the elastic body via a load transmission cord by rotation of the rope winding drum linked to the movement of the operating rod; It is composed of

The load receiving mechanism body adjusts the amount of displacement of the elastic body by the rotation of the adjustment operation member, and a pair of contacts that slides left and right on the support shaft by the rotation of the adjustment operation member. It is preferable to provide a forward tilt angle adjusting mechanism that holds the waist posture of the worker while tilting by applying a reaction force to the operating rod by the member or stopping the displacement .

  In addition, the wearing tool has a back surface mat that abuts from the back surface of the worker to the buttocks, and is contacted with the back band portion that is connected to the support and is disposed on the back surface side of the worker, and the shoulder of the worker. A pair of left and right shoulder straps that have shoulder pads that contact each other, one end of which is connected to the support, and the other end is connected to the casing of the load receiving mechanism so as to hang the operator over the shoulder from the back. It is good to comprise a part and a collar part receiving band part formed by attaching the connection band connected with the said casing to the horizontally long collar part reception band connected with the said operating rod.

Since the present invention is configured as described above, the following effects are obtained.
(1) The middle waist work auxiliary device is easy to wear and uses, and can reduce the load on the waist of the worker in the middle waist posture as much as possible. It is possible to improve work efficiency.
(2) Since the support body of the middle waist assisting device is formed so as not to be affected by the back of the operator who protrudes backward during forward bending, there is almost no restraint of the operator and the work is performed in a forward tilted posture. The movement of time is not constrained.
(3) Since the support body and the load receiving mechanism body are supported by a mounting tool that is integrally mounted from the operator's shoulder to the back, waist, buttocks, and back of the thigh, the weight feeling can be reduced, and work and walking Since the wearing tool is held in a seated state during the forward tilting work, the work in the forward tilted posture of the middle waist can be easily performed.
(4) load bearing Seung mechanism is nest in cooperation with the elastic force of action and the load bearing Seung mechanism, the upper body weight applied from the knee when it becomes half-sitting when working toward the upper thigh and waist elastic member Because of the configuration, the operator can reduce the burden of the spine standing muscle that causes back pain and the compression force of the lumbar intervertebral disk, and the gentle reaction force works when raising the upper body, Pain and back pain can be reduced.
(5) The elastic force acting mechanism is housed in the casing so as to be displaceable in the axial direction, and is configured to be displaced in the axial direction by the movement of the left and right thighs during walking of the wearing worker. The wearer can easily walk without receiving the reaction force of the elastic force regardless of the deflection of the force.
(6) The load receiving mechanism body is provided with a forward tilt angle adjustment mechanism, and the displacement amount of the elastic body is arbitrarily adjusted by the adjusting operation member so that the weight of the upper body of the worker and the reaction force of the elastic force are balanced. Therefore, even if the forward leaning posture necessary for the work contents and the physique of the worker is taken, there is no fatigue, and it is possible to walk even when a load of the forward leaning posture is applied.
(7) Since an elastic body is used as the drive source, it is lightweight, has a simple mechanism, does not easily break down, and does not break down or runaway due to the use of a battery power supply or motor, and the battery capacity is running out. And there is no trouble of charging.
(8) The wearing tool is composed of a back band part, a shoulder band part, and a buttocks receiving band part, so it is lightweight and easy to wear, and it is attached to the body with a back mat and a shoulder pad. As a result, the ease of movement during the work is ensured while giving close contact to the worker. Further, the slight adjustment to the working posture can be performed by adjusting the length of the shoulder band portion on the front surface of the wearing tool.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 and FIG. 2, reference numeral 1 denotes a support member that constitutes a middle waist work auxiliary device and is placed on the back surface of the worker A. The support body 1 can be connected at the center by inserting two support pipes 1A, 1A made of metal or synthetic resin at the tip side and fastening with screws 1B in consideration of ease of transportation and storage. It is configured, and is formed in a substantially square shape with substantially the same width as the average back width of the worker A, so that it is not affected by the back protruding backward when the worker A is bent forward. Further, the support body 1 is formed so that the upper corners 1C and 1C are inclined so as not to have a protruding portion, so that it does not hit surrounding installations or cultivated plants when working in a round roof type plastic house. It is. The support 1 is attached to the worker A by attaching a mounting tool 31 (41) to be described later.

In FIG. 1 to FIG. 4, reference numeral 2 denotes a load receiving mechanism that constitutes the middle waist work auxiliary device together with the support 1. Reference numeral 3 denotes a casing constituting the load receiving mechanism 2, and the casing 3 has a cylindrical operating mechanism housing cylinder 4 and the operating mechanism housing cylinder 4 so as to be positioned on both sides of the waist of the worker A when mounted. In order to removably connect the support body 1 to the drum case 5, the outer cover 5A that covers the shaft end of the outer cover 5A and the inner cover 5B that abuts against the outer cover 5A are detachably connected to the drum case 5. The left and right brackets 6 and 6 are integrally formed. An elliptical support hole 7 is formed in the outer cover 5A and the inner cover 5B so as to be positioned substantially at the axial center of the operating mechanism housing cylinder 4, and a spring seat support 12 (to be described later) is smoothly provided in the support hole 7. An elliptical sliding auxiliary ring 7A for sliding is fitted. Note that the support 1 is detachably connected to the casing 3 in consideration of storability during transportation. The drum cases 5 and 5 are positioned on both sides of the waist of the worker A when the drum cases 5 and 5 are mounted. This means that the rotary shaft 25A of the rope entrainment drum 25 described later is used as a connecting portion of the worker's pelvis and femur. By making it correspond approximately, there is no need for a mechanism for expanding and contracting the actuating rod 29, which will be described later, when the forward leaning posture is taken.

Reference numeral 8 denotes a spring pressing mechanism provided in the operating mechanism housing cylinder 4 so as to be displaceable in the axial direction. Reference numeral 9 denotes a hollow shaft that constitutes the spring pressing mechanism 8, and reference numeral 10 denotes a central sleeve that is fitted into the approximate center of the hollow shaft 9 so as to be slidable in the axial direction. Reference numerals 11 and 11 denote a pair of left and right inner sliding spring seats which are fitted to the hollow shaft 9 so as to be slidable in the axial direction. The inner sliding spring seats 11 are inserted into the hollow shaft 9 and load absorbing which will be described later. the non-operation by the spring force of the spring 14 and the inner sleeve 11A as衝止member tip 11A ₁ is in contact with the central sleeve 10, and a circular shallow container-like spring seat body 11B which is fitted to the inner sleeve 11A It is composed of

12 and 12 are a pair of left and right spring seat supports inserted into both ends of the operating mechanism accommodating cylinder 4, and each spring seat support 12 is fixed to the elliptical cylindrical portion 12A and the outer edge of the elliptical cylindrical portion 12A. And a blocking portion 12B having a screw shaft insertion hole at the center. Each spring seat support 12 is slidable in a substantially elliptical support hole 7 formed in the outer cover 5A and the inner cover 5B of the casing 3, and is inserted in a non-rotatable manner by being elliptical. It is fitted.

Reference numerals 13 and 13 denote a pair of outer variable spring seats that are opposed to the inner sliding spring seats 11 and 11 and that are axially displaceable and non-rotatable in the spring seat support 12. Each of the outer variable spring seats 13 is slidably fitted into a hollow shaft 9 and formed into an elliptical shallow container shape, and from the center of the spring seat body 13A toward the inner side in the axial direction. projects, provided in the center of the spring seat body 13A in a state tip 13B ₁ when displaced and the outer sleeve 13B of the衝止member abutting the rear end 11A ₂ of the inner sleeve 11A, which is fitted to the outer sleeve 13B And a right female screw 13C to which a later-described one-side adjusting screw shaft 16 is screwed. Here, the reason why the spring seat main body 13 </ b> A is dish-shaped is to smoothly slide the spring seat main body 12 with respect to the spring seat support 12. The outer variable spring seat 13 on the other side is also composed of a spring seat body 13A, an outer sleeve 13B, and a left female screw 13D to which an other side adjusting screw shaft 19 described later is screwed. It is a reverse screw. 14 and 14 are load absorption springs comprising compression springs stretched between a pair of opposed inner sliding spring seats 11 and outer variable spring seats 13. For each load absorbing spring 14, the inner sleeve 11A and the outer sleeve 13B also have a spring guide function.

Next, in FIGS. 3 and 4, reference numeral 15 denotes a forward tilt angle for setting a reaction force corresponding to the forward tilt angle of the middle waist posture of the worker A by adjusting the initial deflection amount of the load absorbing spring 14. The adjustment mechanism is shown. Reference numeral 16 denotes a one-side adjustment screw shaft (a screw shaft shown on the right side in the figure) constituting the forward tilt angle adjustment mechanism 15, and a one-side adjustment screw shaft provided with an adjustment knob 17 as an adjustment operation member at the outer shaft end. 16 is inserted into the spring seat support 12, protrudes into the hollow shaft 9 in a state of being screwed to the right female screw 13 </ b> C of the outer variable spring seat 13, and the tip side is fixed to the interlocking piece 18 fixed to the hollow shaft 9. When the one-side adjustment screw shaft 16 is rotated by the adjustment knob 17, the hollow shaft 9 is also rotated integrally.
Reference numeral 19 denotes one side adjustment screw shaft 16 and the other side adjustment screw shaft (a screw shaft shown on the left side in the figure) on which a reverse screw is engraved. The other side adjusting screw shaft 19 is inserted into the spring seat support 12 on the outer shaft end 19A side, and is rotatably supported by the spring seat support 12 by a shaft stopper 20, and the other side of the outer variable spring seat 13 is supported on the other side. The left female screw 13D is screwed to protrude into the hollow shaft 9, and the tip side is fixed to the interlocking piece 21 fixed to the hollow shaft 9.

According to the forward tilt angle adjusting mechanism 15 having the above-described configuration, when the one-side adjusting screw shaft 16 is rotated by the adjusting knob 17, the outer side formed into an elliptical shape and inserted into the elliptical spring seat support 12. Since the variable spring seat 13 does not rotate together, it is displaced in the axial direction against the spring force of the load absorbing spring 14 and approaches the inner sliding spring seat 11 so that the interval between the spring seats is narrowed. 14 can be reduced (see FIG. 4). Then, when reaching the maximum recommended amount of deflection of the load-absorbing spring 14, the distal end 13B ₁ of the outer sleeve 13B of the outer variable spring seat 13 and abuts against the rear end 11A ₂ of the inner sleeve 11A of the inner sliding spring seat 11 axis Directional displacement stops. Thus, the working posture can be adjusted to obtain the maximum reaction force of the load absorbing spring 14 and the durability of the load absorbing spring 14 can be enhanced.

When the hollow shaft 9 rotates as described above, the interlocking piece 21 rotates and the other-side adjustment screw shaft 19 also rotates. However, since the other-side adjustment screw shaft 19 is a reverse screw, it has an elliptical shape. The outer variable spring seat 13 is displaced in a direction approaching the inner sliding spring seat 11 without being rotated, and the initial deflection amount of the other load absorbing spring 14 can be reduced.
In this way, when the adjustment knob 17 is operated to adjust the working posture to obtain the maximum reaction force of the load absorbing springs 14, 14, the inner sleeve 11A and the outer sleeve 13B are abutted to stop the movement of the operating rod 29. be able to. In this case, since the reaction force of each load absorbing spring 14 is the maximum, the inner sleeve 11A and the outer sleeve 13B frequently move toward and away from each other. When the sleeve 11A and the sleeve 13B are separated from each other, the load absorbing spring 14 supports the upper body of the worker A. When the sleeve 11A and the sleeve 13B come into contact with each other, the load is supported by both the sleeves 11A and 13B. The operating rod 29 can obtain a slight degree of freedom in movement.
Further, when the adjustment knob 17 is turned, the left and right inner sliding spring seats 11 and the outer variable spring seats 13 shown in FIGS. 3 and 4 are displaced by the same amount of displacement. The amount of deflection of the left and right load absorbing springs 14, 14 can be adjusted evenly.

  Further, referring to FIGS. 3 to 7, a pair of left and right load transmission mechanisms 22 and 22 for transmitting the load applied from the waist to the thigh to the spring pressing mechanism 8 and absorbing it when the operator A becomes the middle waist. Will be described. 23 and 23 are a pair of upper and lower guide pulleys constituting each load transmission mechanism 22, and 24 is a U-shaped bracket having a pair of opposed plates 24A and 24A that pivotally support the guide pulleys 23 and 23. The plates 24A and 24A are fixed so as to sandwich the support hole 7 between the outer cover 5A and the inner cover 5B. Reference numeral 25 denotes a rope-winding drum that is pivotally supported in the drum case 5 by a rotary shaft 25A. The rope-winding drum 25 is provided with a rope fixing piece 26 on the outer periphery. Reference numeral 27 is a guide wheel that is positioned between the rope winding drum 25 and the guide pulley 23 and is pivotally supported in the drum case 5. The guide ring 27 is a one-side rope portion that is engaged with the inner sliding spring seat 11. 28B and the other side cord part 28D have a function to make the load applied uniformly. By making the load uniform in this way, the rotational force around the pitch axis with respect to the hollow shaft 9 is eliminated, the smooth sliding of the inner sliding spring seat 11 and the strength of the hollow shaft 9 are reduced, and the weight is reduced. Yes.

  Reference numeral 28 denotes a load transmission line. The load transmission line 28 engages the intermediate part 28A with the cable fixing piece 26, and the one side line part 28B is wound around the one guide pulley 23 from the line entraining drum 25 and is turned in the direction of 90 degrees to operate. The tip 28C is led into the mechanism housing cylinder 4 and is engaged with the inner sliding spring seat 11. Further, the other side cable portion 28D engaged with the cable fixing piece 26 and turned up is hung from the cable winding drum 25 to the other guide pulley 23 through the guide wheel 27 and turned in the direction of 90 degrees to operate. The tip 28E is led into the mechanism housing cylinder 4 and is engaged with the inner sliding spring seat 11.

  Reference numeral 29 denotes an operating rod that is connected to the rotary shaft 25A of each cording drum 25 and extends downward from the drum case 5. The operating rod 29 matches the upper casing 29A and the physique of the worker A. The lower casing 29C is connected to the upper casing 29A by a sliding component 29B so as to be extendable and bent, and the lower casing 29C is connected to the lower end of the lower casing 29C by a rotating shaft 29D. A knee pad 29E applied to the vicinity of the knee, and a knee locking piece 29F projecting in a curved shape so as to be applied to the inner side surface of the knee from the rotation center of the knee pad 29E. Here, the upper housing 29A is pin-coupled to the rotation shaft 25A, thereby rotating the rotation shaft 25A integrally and moving the thigh with a play that swings in the lateral direction. It is easy. Further, a buffer elastic body that disperses the compression force applied to the knee when tilting forward is attached to the inner surface of the knee pad 29E. The load transmission mechanism 22 has the above-described configuration, and the operation thereof will be described later together with the walking description of the worker A.

  However, the load receiving mechanism 2 includes the casing 3 including the operating mechanism housing cylinder 4, the drum case 5 and the bracket 6, the spring pressing mechanism 8 provided in the operating mechanism housing cylinder 4, the forward tilt angle adjusting mechanism 15, Although comprised from the load transmission mechanism 22, the mounting tool 31 for mounting | wearing the body of the operator A with this load receiving mechanism body 2 and the support body 1 is shown in FIG. 8 thru | or FIG.

Reference numeral 32 denotes an upper mounting body that constitutes the mounting tool 31 and is engaged with the upper body of the worker A. The upper mounting body 32 is sewn and supported by crossing one vertical belt and three horizontal belts. A back support portion 32A attached to the body 1, and connected to the back support portion 32A, extending forward, and having a locking tool such as a velcro fastener at the tip, hung on the shoulder of the operator A and in front of the chest The shoulder belt portions 32B and 32B, which are adjustable in length, can be attached to the shoulder belt portions 32B, buffer pads 32C provided from the shoulders to the chest, and the back pad portions 32A. It is comprised from the vertically long buffer mat 32D arrange | positioned to the collar part receiving belt 34B mentioned later. The back rest 32A is engaged with the upper side of the support 1 so that the length can be adjusted, and the lateral side is attached with the side of the support 1 so that the length can be adjusted. Adjustably attached. Further, the shoulder belt portions 32B, 32B are wound around the operating mechanism housing cylinder 4 at positions where the lower end side is closer to the drum cases 5, 5.

Reference numeral 33 denotes the mounting tool 31 and is a buffer body for protecting the waist of the worker A from the load receiving mechanism 2. The buffer body 33 is a waist covered with an elastic material such as a thick sponge with a cloth. Attached to the abutment portion 33A, the abdominal belt portion 33B that is attached to the waist abutment portion 33A, has a locking tool such as a buckle on the tip side, and can be engaged in front of the abdomen of the operator A, and the waist abutment portion 33A The connecting belt portion 33C is attached and is wound around the load receiving mechanism 2 and can be attached and detached with an engaging tool such as a Velcro fastener.

  Further, reference numeral 34 denotes a cloth buttock receiving member that supports the buttock of the worker A in the middle waist posture. The collar receiver 34 is provided in the lateral direction by sewing two attachment belts 34A and 34A wound around the operation mechanism accommodating cylinder 4 so that the length thereof can be adjusted, and the lower ends of the attachment belts 34A and 34A. Both end sides are composed of a wide collar receiving belt 34B which is attached to the left and right operating rods 29, 29 so that the length can be adjusted. And the collar part receiving body 34 is provided in the casing 3 and the operating rods 29 and 29 so that attachment or detachment is possible by using a velcro fastener.

  As shown in FIG. 10, when the worker A assumes a forward leaning posture, the support 1 and the operating rods 29 and 29 rotate in a substantially “<” shape around the rotation shaft 25 </ b> A, and the load absorbing spring 14, 14 is compressed and the reaction force is accumulated. Since this reaction force is a force to return to the original state with the knee pad 29E, 29E as a fulcrum, the posture holding function of the load receiving mechanism 2 is not stable, and the holding force that supports the upper body of the worker A Is halved. Therefore, the hook receiving belt 34B is engaged with the pair of operating rods 29 and 29 so that the length can be adjusted, and the backrest 32A and the attachment belt 34A are wound around the operating mechanism housing cylinder 4 so that the length can be adjusted. 1. A certain holding feeling can be obtained by drawing the casing 3 and the operating rods 29, 29 to the worker A. Thus, by adjusting the forward tilt angle by adjusting the length of the collar receiving belt 34B and using it together with the forward tilt angle adjusting mechanism 15, better usability can be obtained. Thus, the buttock receptacle 34 gives a seating feeling to the buttock when tilted forward, and contributes to a reduction in fatigue.

  The middle and lower back work assisting device according to the present embodiment has the above-described configuration. Next, the operation thereof will be described. First, the upper mounting body 32 of the mounting tool 31 is hung on the shoulder and carried on the shoulder, and the cushioning body 33 and the buttocks receiving body 34 are attached to the back, waist and thigh of the worker A, respectively, thereby supporting the supporting body 1 and the load receiving body. The support mechanism 2 is worn (see FIG. 9). Next, with reference to FIG. 11 thru | or FIG. 13, an action | operation is demonstrated separately at the time of the walk in an upright state and the walk in a forward-tilt state. As a common premise, the operating rods 29 and 29 are connected to the rotary shaft 25A of the rope-winding drum 25, and the rotary shaft 25A is positioned substantially corresponding to the joint position connecting the operator's A pelvis and femur. Therefore, the flow line of the knee pad 29E of each actuating rod 29 and the flow line of the knee of the worker A are close to each other, and there is hardly any deviation in use during walking. Further, the lengths of the left and right load transmission lines 28 and 28 which are wound back by the cable fixing piece 26 and locked at both ends to the inner sliding spring seat 11 are constant regardless of the weight of the load.

In such a configuration, when the worker A steps on the right foot in an upright state, for example, the left foot that is the shaft foot is left behind, and the left operating rod 29 that moves integrally with the left foot is as shown in FIG. As shown in FIGS. 5 and 6, the cable winding drum 25 rotates in the direction indicated by the arrow and the load transmission cable 28 on the right foot side is wound to move the inner sliding spring seat 11 toward the outer variable spring seat 13. The load transmission cable 28 on the left foot side is pulled back (see FIG. 4). As a result of a series of movements of the left and right feet, the entire spring pressing mechanism 8 is guided by the sliding auxiliary rings 7A and 7A and directed to the casing 3 to the right in the direction indicated by the arrow B as shown in FIG. To slide. Conversely, when the left foot is stepped on in an upright state, the left and right operating rods 29 and 29, the rope entrainment drums 25 and 25, and the load transmission cords 28 and 28 move in the opposite directions, and the spring pressing mechanism 8 is On the other hand, as shown in FIG.

Next, the case of walking in a forward leaning posture during work will be described. In the present embodiment, the inclination angle of the operating rod 29 with respect to the spring pressing mechanism 8 is adjustable in the range of 80 to 120 degrees. However, when the operator A assumes a forward inclined posture, as shown in FIG. The inner drum springs 25, 25 rotate in the direction indicated by the arrow and wind the load transmission cable 28, whereby the inner sliding spring seats 11, 11 are separated and pulled outward on the outer variable spring seats 13, 13 side. As a result, the load absorbing springs 14 and 14 are compressed. In this state, when the worker A steps on the right foot, the left foot, which is the shaft foot, remains rearward as shown in FIG. 11, and the rope entrainment drum 25 rotates together with the actuating rod 29 on the right foot side, and the load transmission cable on the right side In contrast, the load transmission cable 28 on the left side is returned. In the simultaneous movement of the left and right feet, the spring pressing mechanism 8 is displaced rightward in the direction indicated by the arrow B in the casing 3 with the load absorbing springs 14 and 14 being compressed as shown in FIG. 13-A. To do. On the contrary, when the left foot is stepped forward in the forward tilted state, the left and right operating rods 29 and 29, the rope entrainment drums 25 and 25, and the load transmission cords 28 and 28 move in the opposite direction to the above. As shown in B, the spring pressing mechanism 8 slides and displaces to the left with respect to the casing 3 with the load absorbing spring 14 being compressed. In this way, since the spring pressing mechanism 8 is displaced left and right even in the forward leaning posture, the worker A can lean forward without any special force even if the reaction force is accumulated in the load absorbing spring 14. You can walk as it is.

  Further, in the present embodiment, the central sleeve 10 is fitted to the substantially axial center of the hollow shaft 9, and the inner sliding spring seats 11, 11 are brought into contact with both ends by the spring force of the load absorbing spring 14. It is. When the outer variable spring seat 13 is displaced in the center direction of the hollow shaft 9 by the forward tilt angle adjusting mechanism 15, the load absorbing spring 14 is compressed and the inner sliding spring seat 11 is displaced in the center in the axial direction. The load transmission cable 28 connected to the seat 11 is also pulled, and the angles of the left and right operating rods 29 and 29 are changed, and the usability of the worker A is deteriorated. In order to eliminate such a situation, the central sleeve 10 keeps the distance between the pair of inner sliding spring seats 11 and 11 constant, thereby preventing a situation where the angles of the left and right operating rods 29 and 29 are greatly different. It is easy to use.

Further, the middle waist work auxiliary device has a forward tilt angle adjusting mechanism 15 that adjusts the spring force of the load absorbing spring 14 by rotating the adjustment knob 17, and the load absorbing springs 14, 14 that have adjusted the spring force. The displacement of the inner sliding spring seats 11 and 11 stops depending on whether the reaction force balances the weight of the upper body of the worker A or whether the inner sleeves 11A and 11A and the outer sleeves 13B and 13B collide with each other. As a result, the forward leaning posture taken during work is substantially fixed, and fatigue of the spine standing muscles can be reduced by depositing the upper body in the mid-lumbar work auxiliary device. When the worker A is a man or when performing work while deeply dropping his / her waist, more appropriate working conditions can be achieved by adjusting the spring force.

  Next, FIGS. 14 to 17 show a mounting tool 41 according to another embodiment. Reference numeral 42 denotes a back band part that constitutes the wearing tool 41 and is connected to the support 1 and disposed on the back side of the worker A. The rear band portion 42 has an upper end side 43A wound around the center of the support 1 so as to be adjustable in length, and a lower end is attached to the approximate center of the casing 3 so as to be adjustable in length. The vertical band 43 is sewn in a cross shape at a substantially intermediate position, and extends in the lateral direction, and both distal end sides 44A and 44A are constituted by a horizontal band 44 engaged with the support 1. A rectangular back mat 45 formed of an elastic material such as urethane is attached to the back band portion 42 and is located on the inner side, which is the back side of the worker A. The lower end of the back mat 45 45 </ b> A extends to the lower edge of the collar receiving band portion 50.

  46 and 46 are a pair of left and right shoulder straps, each shoulder strap 46 having an upper end 47A connected to the approximate center of the support 1 and a lower end 47B wound around the casing 3 so as to be in the middle of the chest area. A shoulder band 47 having an adjustment tool 47C for adjusting the length thereof, and a shoulder pad 48 formed of an elastic material such as urethane attached from the upper end side of the shoulder band 47 to the middle so as to contact the shoulder of the worker A. It is composed of. The shoulder bands 47 and 47 are hung from the back of the worker A over the shoulders to the front side, pass through the sides, and extend to the casing 3 side. Reference numeral 49 denotes an adjustable chest strap band portion that is sewn at one end in the middle of both shoulder straps 47 and is provided with insertion fasteners 49A and 49B that engage with each other at the tip.

  Reference numeral 50 denotes a buttocks receiving band portion for supporting the buttocks of the worker A and for associating the operating rods 29 and 29 with the movement of the thighs in the front-rear direction. The flange receiving band 50 includes a laterally wide and wide flange receiving band 51 that winds both end sides 51A and 51A around the operating flanges 29 and 29, and one end 52A is sewn to the flange receiving band 51. The front end side is composed of two connecting bands 52, 52 that are wound around the casing 3 so as to be adjustable in length.

  The mounting tool 41 has the above-described configuration, and the back band part 42, the shoulder band parts 46 and 46, and the collar part receiving band part 50 are detachably connected by using, for example, a velcro fastener, so that the support 1 and The support body 1 and the load receiving mechanism body 2 can be mounted by making the casing 3 detachable and adjusting the appropriate length so as to match the physique of the worker A. Further, the vertically long back surface mat 45 is interposed from the vicinity of the center of the back of the worker A to the buttocks (see FIG. 17), thereby improving the feeling of closeness at the time of wearing. As a result, the feeling of pressure from the load receiving mechanism 2 is reduced and the sense of unity is produced even when the vehicle is tilted forward, thereby reducing the weight of the mid-lumbar work assisting device.

  The back band part 42 and the pair of shoulder band parts 46 are fastened together with the upper body of the worker A so that the support 1 and the load receiving mechanism 2 are integrated with each other. The weight of the load receiving mechanism 2 is received by both shoulders by the pair of shoulder band portions 46, 46. In addition, the buttocks receiving band portion 50 supports the reaction force of the load absorbing spring 14 applied to the waist during the middle waist operation in cooperation with the shoulder bands 47 and 47 and the knee pad 29E and 29E.

  In this embodiment, the load absorbing spring 14 made of a compression spring is used as the elastic body of the load receiving mechanism 2. However, a support plate is provided in the operating mechanism housing cylinder 4, and the support plate is slid inwardly. A tension spring may be stretched between the spring seat 11 and the spring seat 11. Further, rubber may be used for the elastic body instead of the spring, and automatic control can be enabled by using an artificial muscle, an air cylinder or a hydraulic cylinder.

It is a front view of the support body and load receiving mechanism which concern on embodiment of this invention. It is a right view of FIG. It is explanatory drawing which shows the structure of a load receiving mechanism body. It is explanatory drawing of the load receiving mechanism body of the state which gave the initial deflection to the load receiving spring. It is explanatory drawing in the drum case which shows the structure of a load transmission mechanism. It is explanatory drawing in the drum case which shows the operating state of a load transmission mechanism. It is composition explanatory drawing of a load receiving mechanism body. It is a front view of a middle waist work auxiliary device. It is explanatory drawing which shows the mounting state of a support body and a load receiving mechanism body. It is explanatory drawing of the use condition which mounted | wore the support body and the load receiving mechanism body. 11 to 13 relate to the operation of the load receiving mechanism, and FIG. 11 is an explanatory diagram showing the movement of the left and right operating rods during walking. FIG. 12A is an explanatory diagram in which the spring seat support is displaced rightward when the right foot is stepped forward in the upright state, and FIG. 12B is a diagram showing the spring seat support when the left foot is stepped forward in the upright state. It is explanatory drawing displaced to the left direction. 13A is an explanatory diagram in which the spring seat support is displaced in the right direction when the right foot is stepped forward in the forward tilt posture, and FIG. 13B is a spring seat support when the left foot is stepped forward in the forward tilt posture. It is explanatory drawing which a body displaces to left direction. 14 to 17 show a mounting tool according to another embodiment, and FIG. 14 is a front view of the mounting tool attached to a support and a casing. It is a right view of FIG. It is explanatory drawing of the state which mounted | wore the support body and the load receiving mechanism body with the mounting tool. It is explanatory drawing of the use condition which mounted | wore the support body and the load receiving mechanism body.

DESCRIPTION OF SYMBOLS 1 Support body 2 Load receiving mechanism body 3 Casing 8 Spring press mechanism (elastic force action mechanism)
9 Hollow shaft (support shaft)
14 Load absorption spring 15 Forward tilt angle adjustment mechanism 22 Load transmission mechanism 25 Cable entrainment drum 28 Load transmission cable 29 Actuation rod 41 Mounting tool 42 Back band part 45 Back mat 46 Shoulder band part 48 Shoulder pad 50 Fade receiving band part

Claims (3)

Before forming so as not to be affected by the operator's back, which pushed out backward flexion, a support for mounting on the rear of the operator, provided on the lower side of the support, the movement of the thighs of the operator A load receiving mechanism body configured to receive a load applied via a load transmission mechanism having an interlocking operating rod with an elastic body of an elastic force acting mechanism, and the support body and the load receiving mechanism body as the worker. A mounting tool that is provided on the support body and the load receiving mechanism body so as to be detachably mounted on the body, supports the buttocks and the back of the thigh from the shoulder of the worker in the mounted state, and holds the seat in a seated state during forward tilting work. The load receiving mechanism includes a casing connected to the support, a support shaft disposed in a longitudinal direction in a cylindrical portion of the casing, and a pair of left and right along the support shaft. The elastic bodies are spaced apart, and the elastic force of each elastic body acts in the axial direction. An elastic force acting mechanism that is configured to be stored in an axially displaceable manner with respect to the casing by transmitting the movement of the left and right thighs during the walking of the operator via the load transmission mechanism. A pair of left and right cable-winding drums are pivotally supported in the casing so as to be rotatable in sections, and an operating rod linked to the movement of the operator's thigh is connected to each of the cable-winding drums, kneeling work assistance device you characterized in that through the load transmitting search by the rotation of the cord winding drum with the movement of the actuating rod are constructed and a load transfer mechanism which is adapted imposing a load on the elastic member . The load receiving mechanism body adjusts the amount of displacement of the elastic body by rotation of the adjustment operation member, and includes a pair of stopper members that slide left and right on the support shaft by rotation of the adjustment operation member. The middle waist work assisting device according to claim 1 , further comprising a forward tilt angle adjustment mechanism that holds the waist posture of the worker while leaning forward by applying a reaction force to the operating rod or stopping the displacement. . The wearing tool has a back surface mat that abuts from the back surface of the operator to the buttocks, a back band portion that is connected to the support and is disposed on the back side of the operator, and a shoulder contact that abuts the shoulder of the operator. A pair of left and right shoulder straps that are hanged over the shoulder from the back to the operator, with one end connected to the support and the other end connected to the casing of the load receiving mechanism. The both ends are constituted by a horizontally long flange receiving band connected to the operating rod and a flange receiving band portion formed by attaching a connecting band connected to the casing. Middle waist work assist device.

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