JP5731449B2 - Back strap mounting structure - Google Patents

Description

  The present invention relates to a mounting structure for a back strap for an operator to carry a work machine main body of a back work type work machine.

  2. Description of the Related Art Conventionally, there is known a backpack-type work machine in which an operator carries a work on a work machine main body including a liquid pump and a liquid tank (see, for example, Patent Document 1). A pair of backpack bands are attached to the work machine main body of such a backpack type work machine, and the operator carries the work machine main body with the backpack bands on both shoulders. As a general structure for attaching the back strap to the work implement main body, there is a structure in which a hook portion of a so-called eggplant connected to the end portion of the back strap band is engaged with a shaft provided on the work implement main body. (For example, refer to Patent Document 2).

Japanese Patent No. 4286816 JP 2012-5407 A

  By the way, in patent document 2, as shown in FIG. 6, the attachment structure of a backpack band is perpendicular to the axial part 20 which faces the back surface of the operator P, and extends the hook part 13 of an eggplant. Since the structure is engaged from the direction, a twisted portion T is likely to be generated in the band portion 11 of the backside negative band 3 that should follow the upper body of the worker P. In this case, the worker P is uncomfortable. Moreover, in the said structure, the long side part 13c which comprises the root part of the hook part 13 fits in the clearance gap R between the working machine main-body part 1 and the axial part 20 in an upright state, and the movement of a NASKA is restrict | limited. Therefore, improvement in handleability is desired.

  The present invention has been made in order to solve such problems, and has a backband mounting structure that does not give the operator uncomfortable feeling caused by twisting of the band of the backband and is excellent in handling. The purpose is to provide.

The attachment structure of the back strap (3) according to the present invention is such that the lower end of the back strap (3) for the operator to carry the work implement main body (1) of the back work implement (100) is the work implement main assembly (1). In the mounting structure that can be attached to and detached from the lower side of the work implement main body (1), the work implement main body (1) is provided on the work implement main body (1) so as to extend in a substantially vertical direction and is substantially horizontal. The first support portion (8) having a through hole (10) penetrating in the direction to be the direction and the lower end portion of the back strap (3) are configured and connected to the end portion (11a) of the band portion (11). And an annular coupling portion (12) that is passed through and engaged with the through hole (10), and the end portion (11a) of the band portion (11) has a width direction in the annular coupling portion (12). the plane formed in a direction substantially perpendicular come direction, substantially vertical way from the position where the through-hole (10) is provided A support in which at least a part of the annular coupling part (12) abuts in a state perpendicular to the first support part (8) at a position below the annular coupling part (12) through the through hole (10). A second support portion (9) having a surface (9a) is provided .

According to such an attachment structure of the back strap (3), when the work implement main body (1) is carried on the back, the first support portion (8) extending in the substantially vertical direction penetrates in the substantially horizontal direction. In order to engage the annular connecting portion (12) with the through hole (10), the end portion (11a) of the band portion (11) connected to the annular connecting portion (12) has a width direction substantially vertical. Turn to face. Therefore, when the operator carries the work implement main body (1) on the back, the band portion (11) of the backpack band (3) does not have a twisted portion and follows the upper body of the worker. (3) does not give discomfort to the operator. Moreover, since the long side part (13c) which comprises the root part of a cyclic | annular connection part (12) does not fit in an upright state with respect to a through-hole (10) in the perpendicular direction, a movement of a cyclic | annular connection part (12) is carried out. Not limited. Therefore, the attachment structure of the back strap (3) is excellent in handleability. Further, since the downward rotation of the annular coupling portion (12) is limited by the second support portion (9), when grounding the work machine main body (1) of the backpack type work machine (100), The annular connecting portion (12) and the band portion (11) are less likely to enter under the work machine main body portion (1), and damage to the annular connecting portion (12), contamination of the band portion (11), and the like are prevented.

  Moreover, it has the annular body (17) which connects an annular connection part (12) and the edge part (11a) of a band part (11), and the surface which an annular body (17) makes makes an annular connection part (12). The length (c) which is half the length of the annular body (17) in the direction substantially orthogonal to the surface and substantially orthogonal to the surface formed by the annular connecting portion (12) grounds the work implement body portion (1). In this case, the height (b) from the ground contact surface to the lower surface (9b) of the second support portion (9) is preferably smaller. According to this, the annular connecting portion (12) and the band portion (11) enter under the work machine main body portion (1), the annular connecting portion (12) is damaged, the band portion (11) is soiled, and the like. More reliably prevented.

  ADVANTAGE OF THE INVENTION According to this invention, the attachment structure of the backpack band which does not give an operator the discomfort resulting from the twist of the band part of a backpack band, and is excellent in a handleability can be provided.

It is a front perspective view of a backpack type work machine to which the attachment structure of the backpack band of the present invention is applied. It is a front view which shows the attachment structure of the backside band which concerns on embodiment of this invention in detail. It is a side perspective view which shows the attachment structure of the backside band which concerns on embodiment of this invention in detail. FIG. 3 is a side view of FIG. 2. It is a side view of the worker who carried the work implement main-body part to which the attachment structure of the backpack band of the present invention was applied. It is a side view of the operator who carried the working machine main-body part to which the attachment structure of the conventional backpack band was applied.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a preferred embodiment of a back band mounting structure of the invention will be described with reference to the accompanying drawings. In the following description, the terms “up / down”, “front / rear”, and “left / right” represent directions with reference to the worker carrying the backpack-type work machine.

  FIG. 1 is a front perspective view of a backpack-type working machine to which the backband mounting structure of the present embodiment is applied. In this embodiment, the backpack-type working machine is described as a backpack-type power sprayer used for spraying medicines and the like. To do.

  As shown in FIG. 1, a backpack type power sprayer 100 covers a work machine main body 1 including a power source and the front side of the work machine main body 1 (the left side in FIG. 1: the back surface side). A back support member 2 that comes into contact with the back of the machine, and a pair of back straps 3 and 3 for the operator to carry the work machine main body 1 on the back. The backpack type power sprayer 100 includes a spray hose that transmits a medicine or the like sent from the work machine main body 1 to the operator's hand, and a spray nozzle provided at an end of the spray hose. . Here, the spray hose and the spray nozzle are removed.

  The work machine main body 1 is mounted on a gantry 4 on which a pump or the like for spraying a drug (here, a drug solution) made of a liquid or powder and mounted on the gantry 4 and accommodates a drug to be sprayed. And a tank 5.

  The back support member 2 is formed of a material having excellent cushioning properties such as sponge, and is interposed between the gantry 4 and the tank 5 and the operator's back when carrying on the back, so as to ease mutual contact.

  The upper ends of the pair of backbands 3, 3 are detachably connected to a pair of upper band attachment portions 6, 6 provided symmetrically with the upper end of the front side of the tank 5. , 3 are detachably connected to a pair of lower band attaching portions 7, 7 provided symmetrically at the lower end on the front side of the gantry 4, respectively. An operator can put his / her shoulders through a pair of loops formed by the pair of backpack bands 3 and 3 and the work implement main body 1 to carry the work implement main body 1 on the back.

  Here, the detail of the attachment structure of each backpack band 3 is demonstrated, referring FIGS. FIG. 2 is a front view showing in detail the attachment structure of the backpack band, FIG. 3 is a side perspective view showing in detail the attachment structure of the backpack band, and FIG. 4 is a side view of FIG.

  As shown in FIGS. 2 to 4, the lower band mounting portion 7 includes a first support portion 8 and a second support portion 9. The first support portion 8 is a plate-like body that protrudes forward from a recessed portion 4 a provided to extend in a substantially vertical direction (vertical direction) at a lower portion on the back side of the gantry 4 and extends in a substantially vertical direction. The first support portion 8 has a through hole 10 penetrating in a substantially horizontal direction at a lower portion protruding forward from the recess 4a. The second support portion 9 is located forward from the recess 4 a at a position substantially lower in the vertical direction than the position where the through hole 10 is provided in the first support portion 8, that is, at the lower end surface of the first support portion 8. Is a plate-like body that protrudes toward the surface, and is provided so as to be orthogonal to the first support portion 8 and to form an inverted T-shape in front view together with the first support portion 8 (FIG. 2). Further, the second support portion 9 has a support surface 9a on which at least a part of the hook portion 13 is in contact with a hook portion 13 to be described later passed through the through-hole 10, and the support portion 9a. The width of the surface 9a in the left-right direction is larger than the outer diameter of the curved portion of the hook portion 13.

  The back strap 3 has a long band portion 11 (FIG. 1) that hangs on the shoulder of an operator, and a lower end portion 11a of the band portion 11 has a NASCAN (annular connection) as a lower end portion of the back strap 3 Part) 12 are connected via an annular body 17. The eggplant 12 is connected to the hook portion 13 that is passed through the through hole 10 of the first support portion 8 and engages with the base end portion 13 a of the hook portion 13, and is connected to the tip end portion 13 b of the hook portion 13. An opening formed between the end portion 13a and the hook portion 13 is closed so as to freely open and close, and a closing body 14 having a ring shape is provided.

  The closing body 14 is a leaf spring body having a biasing force directed from the inner side to the outer side of the ring shape with the base end portion 13a of the hook portion 13 as a fulcrum, and the tip portion thereof is the above-described tip portion 13b of the hook portion 13 with respect to the tip portion 13b. It contacts from the inside of the ring shape.

  In addition, a connecting hole 15 for connecting the annular body 17 is formed in the base end portion 13a of the hook portion 13 so as to penetrate in a direction orthogonal to the surface formed by the eggplant 12. The lower end portion 11a of the band portion 11 is folded back in a direction orthogonal to the width direction to form a tube portion 16 having a tube hole extending in the width direction. The eggplant 12 and the band portion 11 are connected by inserting the rod-shaped portion through the connecting hole 15 and the other rod-shaped portion through the cylindrical portion 16. Here, as shown in FIG. 4, the lower end portion 11 a of the band portion 11 has a width direction facing a direction substantially orthogonal to a surface formed by the ring shape of the NASCAN 12, and the end portion 11 a The half length a of the width of the portion 11a is smaller than the height b from the grounding surface of the work machine body 1 to the lower surface 9b of the second support portion 9. The annular body 17 has a major axis in the substantially vertical direction and a minor axis in the horizontal direction. The length c, which is half of the major axis (outer diameter), extends from the ground contact surface to the lower surface of the second support portion 9. It is smaller than the height b up to 9b. That is, the relationship between the lengths of these three is b> c> a.

  In this way, the eggplant 12 connected to the lower end portion 11a of the band portion 11 opens between the distal end portion 13b and the proximal end portion 13a of the hook portion 13 by pushing the closing body 14 into the inside of the ring shape. Then, the hook portion 13 is passed through the through hole 10 to be attached to the lower band attaching portion 7. In this mounted state, as shown in FIGS. 2 to 4, the hook portion 13 is hooked and engaged with the first support portion 8, and the tip end portion 13 b and the base end portion 13 a of the hook portion 13 are engaged. The gap is closed by the closing body 14 to prevent disengagement.

  According to the attachment structure of the backpack band 3 configured as described above, the hook portion which is a part of the eggplant 12 with respect to the through hole 10 penetrating in the substantially horizontal direction of the first support portion 8 extending in the substantially vertical direction. In order to engage 13, the end portion 11 a of the band portion 11 connected to the hook portion 13 has a width direction facing a substantially vertical direction. Therefore, as shown in FIG. 5, when the operator P carries the work implement main body 1 on the back, the band portion 11 of the back strap 3 does not have a twisted portion and follows the upper body of the operator P. Therefore, the back strap 3 does not give uncomfortable feeling to the worker P. Moreover, since the long side part 13c which comprises the base part of the hook part 13 does not fit in the perpendicular direction with respect to the through-hole 10, it does not restrict | limit the movement of the hook part 13. FIG. Therefore, the attachment structure of the back strap 3 is excellent in handleability.

  Further, the eggplant 12 is configured to include a hook portion 13 and a closing body 14 that closes the end portions forming the opening of the hook portion 13 so as to be openable and closable together with the hook portion 13. Therefore, the attachment / detachment operation of the back strap 3 to the work implement main body 1 is easy, and the disengagement unintended by the operator is prevented.

  Further, the attachment structure of the back strap 3 is perpendicular to the first support portion 8 at a position substantially lower in the vertical direction than the position where the through hole 10 is provided, and the hook portion 13 is passed through the through hole 10. Since the second support portion 9 having the support surface 9a with which at least a part of the hook portion 13 abuts in the state is provided, the downward rotation of the hook portion 13 with the through hole 10 as a fulcrum is restricted. Thus, when the work implement main body 1 is grounded, the hook portion 13 and the band portion 11 are less likely to enter under the work implement main body 1, and the hook portion 13 is prevented from being damaged, the band portion 11 being soiled, and the like. In particular, in the present embodiment, the length a which is half the width of the lower end portion 11a of the band portion 11 is higher than the height b from the grounding surface of the work implement main body portion 1 to the lower surface 9b of the second support portion 9. In addition, since the length c, which is half the length of the annular body 17 in the substantially vertical direction, is smaller than the height b from the ground contact surface to the lower surface 9b of the second support portion 9, However, the lower end portion 11a is particularly difficult to be grounded, and dirt and the like are prevented.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment. For example, in the above-described embodiment, the backpack-type working machine has been described as the backpack-type power sprayer 100. However, the present invention can also be applied to a backpack-type power spreader, a backpack-type blower, and the like. It can also be applied to.

  DESCRIPTION OF SYMBOLS 1 ... Work implement main-body part, 3 ... Back strap, 8 ... 1st support part, 9 ... 2nd support part, 9a ... Support surface, 9b ... Lower surface, 10 ... Through-hole, 11 ... Band part, 11a ... End , 12 ... NASKAN (annular connecting part), 13 ... hook part, 17 ... annular body, 100 ... backpack type power sprayer (backpack type work machine).

Claims (2)

In a mounting structure in which a lower end portion of a back strap (3) for carrying a work implement main body (1) of a backpack type work machine (100) by a worker to the lower side of the work implement main body (1) is detachable. ,
When the work implement main body (1) is carried, a through hole (10) is provided in the work implement main body (1) so as to extend in a substantially vertical direction and penetrates in a substantially horizontal direction. A first support (8) having:
An annular connecting part (12) which constitutes the lower end part of the back strap (3), is connected to the end part (11a) of the band part (11) and engages through the through hole (10); With
End of the band portion (11) (11a) has a width direction, can toward the direction in which the annular coupling part (12) is formed plane substantially perpendicular,
It is orthogonal to the first support part (8) at a position below the substantially vertical direction from the position where the through hole (10) is provided, and the annular connecting part (12) is the through hole (10). An attachment structure for a back strap (3), comprising a second support portion (9) having a support surface (9a) against which at least a part of the annular coupling portion (12) abuts in a state of being passed through . An annular body (17) for coupling the annular coupling part (12) and the end part (11a) of the band part (11);
The surface formed by the annular body (17) is substantially orthogonal to the surface formed by the annular coupling portion (12),
The length (c) that is half the length of the annular body (17) in the direction substantially orthogonal to the surface formed by the annular connecting portion (12) is the grounding surface when the work implement main body (1) is grounded. The mounting structure for a back band (3) according to claim 1, characterized in that the height (b) is smaller than the height (b) from the second support portion (9) to the lower surface (9b) .

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