Power-assisted dolly

Abstract

To provide a power-assisted dolly that can achieve desired assist force and provide good operability.SOLUTION: A power-assisted dolly 10 includes: electric motors 28a and 28b configured to assist driving of wheels 24a and 24b provided on a load-carrying platform 12; a connecting member 58 including a slide member 60 that can reciprocate in accordance with a handle portion 44 and a guide member 62 and connecting the handle portion 44 to the load-carrying platform 12; a spring 104 configured to bias the slide member 60 rearward; a stroke sensor 146 configured to detect the stroke amount of the slide member 60; and a control unit 34 configured to control the assist amount based on the detection results of the stroke sensor 146. The connecting member 58 includes, between the slide member 60 and the guide member 62, at least two first guide rollers 106 and at least two second guide rollers 108 for restricting movements in left-right and up-down directions of the slide member 60 while allowing the slide member 60 to the guide member 62.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to an electric assist cart, and more particularly to an electric assist cart such as a hose cart.

Background Art

[0002] As an example of this type of prior art, a fire hose cart is disclosed in Patent Document 1. This fire hose cart includes a loading platform, a main body having a battery box for storing a battery and a control box for storing a control board, a handle provided on the front surface of the main body, a pair of left and right wheels provided on both the left and right sides of the main body, and each electric motor incorporated in each of the pair of wheels. Further, this fire hose cart includes a contact type linear displacement sensor provided behind the shaft constituting the handle, and a tensile force detection unit configured to detect and output, by the sensor, a change amount of the distance by which the shaft moves due to the tensile force applied to the handle during assisted travel, and to adjust the driving force of the electric motor with the output data. The tensile force detection unit includes a sliding shaft fixed to the rear end portion of the shaft constituting the handle by welding and sliding in the tensile direction (forward) due to the tensile force applied to the handle during assisted travel to control the expansion and contraction of the tip portion of the displacement sensor, and a sliding shaft holder for guiding the sliding of the sliding shaft.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the hose cart for fire fighting disclosed in Patent Document 1 as described above, when the handle is pulled in the forward diagonal direction, the sliding shaft may not slide smoothly with respect to the sliding shaft holder. In that case, the tensile force applied to the handle cannot be correctly detected, and a desired assist force is not output, resulting in poor operability.

[0005] Therefore, a main object of the present invention is to provide an electric assist cart that can obtain a desired assist force and has good operability.

Means for Solving the Problems

[0006] To achieve the above object, it includes a loading platform, a pair of wheels provided on the loading platform, an electric motor for assisting the driving of the pair of wheels, a handle portion provided in front of the loading platform for towing the loading platform, a slide member that can reciprocate in the front-rear direction with respect to the loading platform along with the handle portion, and a guide member provided outside the slide member for guiding the reciprocating movement of the slide member, a connecting member that connects the handle portion and the loading platform, an elastic member provided on the handle portion for biasing the slide member rearward, a stroke sensor that detects the stroke amount of the slide member, and a control unit that controls the assist amount by the electric motor based on the detection result of the stroke sensor. The connecting member includes at least two first guide rollers provided between the slide member and the guide member for restricting the movement of the slide member in the left-right direction while sliding the slide member with respect to the guide member, and at least two second guide rollers provided between the slide member and the guide member for restricting the movement of the slide member in the up-down direction while sliding the slide member with respect to the guide member. An electric assist cart is provided.

[0007] In the present invention, the left - right movement of the slide member can be restricted while sliding the slide member relative to the guide member by at least two first guide rollers provided between the slide member and the guide member. Also, the up - down movement of the slide member can be restricted while sliding the slide member relative to the guide member by at least two second guide rollers provided between the slide member and the guide member. Thereby, the rotational movement of the slide member can be further restricted. Therefore, even when the handle portion is pulled in an arbitrary direction including the front - diagonal direction, the slide member capable of reciprocating along with the handle portion can smoothly slide in the front - rear direction with respect to the guide member. As a result, the stroke amount of the slide member can be appropriately detected by the stroke sensor, and the assist amount by the electric motor can be appropriately controlled based on the detection result of the stroke sensor. Thus, an electric - assist cart with a desired assist force and good operability can be obtained.

[0008] Preferably, at least one of the slide member and the guide member has at least one groove that extends in the front - rear direction and into which the first guide roller or the second guide roller fits. In this case, the first guide roller or the second guide roller provided between the slide member and the guide member fits into a groove formed to extend in the front - rear direction in either the slide member or the guide member. Here, the first guide roller or the second guide roller fitted in the groove can move in the front - rear direction along the groove, but is suppressed from moving in a direction perpendicular to the front - rear direction. Therefore, by fitting the first guide roller into the groove, the left - right movement of the slide member can be restricted by one guide roller. Also, by fitting the second guide roller into the groove, the up - down movement of the slide member can be restricted by one guide roller. Thereby, the movement of the slide member can be restricted by a small number of guide rollers.

[0009] Preferably, the guide member includes a first guide plate provided on one side of the slide member and a second guide plate provided on the other side. Two first guide rollers are provided between the slide member and the first guide plate, and two first guide rollers are provided between the slide member and the second guide plate. In this case, the two first guide rollers provided between the slide member and the first guide plate and the two first guide rollers provided between the slide member and the second guide plate support the slide member slidably in the front-rear direction from both sides, and can appropriately restrict the movement of the slide member in the left-right direction.

[0010] More preferably, the guide member includes a first guide plate provided on one side of the slide member, a second guide plate provided on the other side, a third guide plate provided above, and a fourth guide plate provided below. One first guide roller is provided between the slide member and the first guide plate, one first guide roller is provided between the slide member and the second guide plate, one first guide roller is provided between the slide member and the third guide plate or the fourth guide plate, and a groove extending in the front-rear direction and into which the first guide roller fits is provided on the opposing surface between the slide member and the third guide plate or the fourth guide plate. In this case, the one first guide roller provided between the slide member and the first guide plate, the one first guide roller provided between the slide member and the second guide plate, and the one first guide roller provided between the slide member and the third guide plate or the fourth guide plate and fitting into the groove support the slide member slidably in the front-rear direction not only from both sides but also from above or below, and can appropriately restrict the movement of the slide member in the left-right direction. Here, since the first guide roller provided between the slide member and the third guide plate or the fourth guide plate fits into the groove extending in the front-rear direction, it can move in the front-rear direction along the groove, but is suppressed from moving in the direction perpendicular to the front-rear direction, and can restrict the movement of the slide member in the left-right direction. Therefore, the movement of the slide member in the left-right direction can be restricted by a small number of first guide rollers.

[0011] Preferably, the guide member includes a first guide plate provided on one side of the slide member, a second guide plate provided on the other side, a third guide plate provided above, and a fourth guide plate provided below. Between the slide member and the third guide plate or the fourth guide plate, two first guide rollers are provided, and on the opposing surface between the slide member and the third guide plate or the fourth guide plate, at least one groove extending in the front-rear direction and into which the corresponding first guide roller fits is provided. In this case, by the two first guide rollers provided between the slide member and the third guide plate or the fourth guide plate and fitting into the corresponding grooves, the slide member is supported slidably in the front-rear direction from above or below. Here, since the two first guide rollers fit into the corresponding grooves extending in the front-rear direction, they can move along the grooves in the front-rear direction, but are suppressed from moving in a direction perpendicular to the front-rear direction, and the left-right movement of the slide member can be restricted. Therefore, the left-right movement of the slide member can be appropriately restricted by fewer first guide rollers.

[0012] Also preferably, two second guide rollers are provided between the slide member and the first guide plate, and on the opposing surface between the slide member and the first guide plate, at least one groove extending in the front-rear direction and into which the corresponding second guide roller fits is provided. Two second guide rollers are provided between the slide member and the second guide plate, and on the opposing surface between the slide member and the second guide plate, at least one groove extending in the front-rear direction and into which the corresponding second guide roller fits is provided. In this case, by the two second guide rollers provided between the slide member and the first guide plate and fitting into the corresponding grooves, the slide member is supported slidably in the front-rear direction from one side, and by the two second guide rollers provided between the slide member and the second guide plate and fitting into the corresponding grooves, the slide member is supported slidably in the front-rear direction from the other side. Here, since each second guide roller fits into the corresponding groove extending in the front-rear direction, it can move along the groove in the front-rear direction, but is suppressed from moving in a direction perpendicular to the front-rear direction, and the up-down movement of the slide member can be restricted. Therefore, the up-down movement of the slide member can be appropriately restricted by fewer second guide rollers.

[0013] More preferably, one second guide roller is provided between the slide member and the first guide plate, and one groove that extends in the front-rear direction and into which the second guide roller fits is provided on the opposing surface between the slide member and the first guide plate. Two second guide rollers are provided between the slide member and the second guide plate, and at least one groove that extends in the front-rear direction and into which the corresponding second guide roller fits is provided on the opposing surface between the slide member and the second guide plate. In this case, the slide member is supported from one side in a slidable manner in the front-rear direction by one second guide roller provided between the slide member and the first guide plate and fitted into the groove, and the slide member is supported from the other side in a slidable manner in the front-rear direction by two second guide rollers provided between the slide member and the second guide plate and fitted into the corresponding groove. Here, since each second guide roller fits into the corresponding groove that extends in the front-rear direction, it can move in the front-rear direction along the groove, but movement in a direction perpendicular to the front-rear direction is suppressed, and the up-and-down movement of the slide member can be restricted. Therefore, the up-and-down movement of the slide member can be appropriately restricted by a smaller number of second guide rollers.

[0014] Preferably, one second guide roller is provided between the slide member and the first guide plate, and one groove extending in the front-rear direction and into which the second guide roller fits is provided on the opposing surface between the slide member and the first guide plate. One second guide roller is provided between the slide member and the second guide plate, and one groove extending in the front-rear direction and into which the second guide roller fits is provided on the opposing surface between the slide member and the second guide plate. In this case, the slide member is supported from one side in a slidable manner in the front-rear direction by one second guide roller provided between the slide member and the first guide plate and fitted into the groove, and the slide member is supported from the other side in a slidable manner in the front-rear direction by one second guide roller provided between the slide member and the second guide plate and fitted into the groove. Here, since each second guide roller fits into the corresponding groove extending in the front-rear direction, it can move in the front-rear direction along the groove, but is suppressed from moving in the direction perpendicular to the front-rear direction, and the up-and-down movement of the slide member can be regulated. Therefore, the up-and-down movement of the slide member can be appropriately regulated by even fewer second guide rollers.

[0015] Also preferably, the stroke sensor is provided below the slide member. In this case, since the stroke sensor is not located above the slide member, it is less likely to receive a load from above. Therefore, damage to the stroke sensor due to a load from above can be suppressed.

[0016] More preferably, it further includes a damper provided on the connecting member to attenuate the reciprocating movement of the slide member. In this case, even if the handle portion is suddenly pushed or pulled, the damper can attenuate the sudden reciprocating movement of the slide member and thus the handle portion. As a result, a sudden change in the stroke amount of the slide member can be alleviated, so that a sudden change in the assist amount can be suppressed. As a result, an electric assist cart with an assist amount that changes smoothly and good operability can be obtained.

[0017] Preferably, the first guide roller and the second guide roller each include a cam follower or a roller follower. In this case, the first guide roller and the second guide roller can be easily configured.

[0018] The electric assist cart according to the present invention can be suitably used for a hose car that can load a fire hose on a loading platform.

[0019] In the present invention, the "opposing surface between the slide member and the first guide plate" refers to the surface of the slide member that opposes the first guide plate, or the surface of the first guide plate that opposes the slide member. The same applies to the opposing surface between the slide member and the second guide plate, the opposing surface between the slide member and the third guide plate, and the opposing surface between the slide member and the fourth guide plate.

[0020] Also, in the present invention, the phrase "the slide member slides with respect to the guide member" includes the case where the slide member moves relatively with respect to the guide member via a guide roller without directly contacting the guide member.

Advantages of the Invention

[0021] According to the present invention, an electric assist cart that can obtain a desired assist force and has good operability can be obtained.

Brief Description of the Drawings

[0022]

Figure 1

Figure 2

Figure 3

Figure 4

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Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Embodiments for Carrying out the Invention

[0023] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, "Fr" indicates the front, "Rr" indicates the rear, "R" indicates the right, "L" indicates the left, "U" indicates the upper, and "Lo" indicates the lower.

[0024] Referring to FIGS. 1 to 3, an electric assist cart 10 according to an embodiment of the present invention is a hose carrier and includes a rectangular parallelepiped loading platform 12. A fire hose (not shown) can be loaded on the loading platform 12. The loading platform 12 includes a bottom plate 14, a pair of side frames 16a and 16b, a front frame 18, a rear cover 20, and an upper frame 22. The rear cover 20 and the upper frame 22 are provided so as to be openable and closable. Thereby, it becomes possible to take out the hose from the rear part and the upper part of the loading platform 12.

[0025] The loading platform 12 is provided with a pair of wheels 24a and 24b. The pair of wheels 24a and 24b are attached to the loading platform 12 via a pair of axles 26a and 26b. The pair of wheels 24a and 24b are provided at intervals in the vehicle width direction so as to sandwich the loading platform 12 at a substantially central portion in the front-rear direction of the loading platform 12.

[0026] Below the loading platform 12, a pair of electric motors 28a and 28b for assisting the drive of the pair of wheels 24a and 24b are provided. The electric motors 28a and 28b are respectively provided coaxially with the axles 26a and 26b and connected to the axles 26a and 26b.

[0027] Below the loading platform 12, a plurality of batteries 30 and an electrical equipment box 32 are provided. The plurality of batteries 30 are arranged side by side in the front-rear direction between the electric motors 28a and 28b. The electrical equipment box 32 is arranged in front of the battery 30 and includes a control unit 34. The control unit 34 controls the amount of assistance by the electric motors 28a and 28b based on the detection result of a stroke sensor 146 (described later). Therefore, electric assist is possible only by pushing and pulling the handle portion 44 (described later).

[0028] At the lower front portion of the loading platform 12, a pair of stands 36a and 36b are provided at intervals in the vehicle width direction. When the user releases the handle portion 44 and is away from the electric assist cart 10, the electric assist cart 10 is supported on the ground by the pair of wheels 24a and 24b and the stands 36a and 36b. In the lower part of the loading platform 12 and in front of the pair of wheels 24a and 24b, a pair of tire guards 38a and 38b are provided. On the upper right of the front frame 18 of the loading platform 12, a switch box 40 is attached. In the lower part of the loading platform 12 and behind the pair of wheels 24a and 24b, an anti-upward guard 42 is provided.

[0029] A handle portion 44 is provided in front of the loading platform 12 to tow the loading platform 12. The handle portion 44 includes a handle body 46 formed in a substantially T shape, and a pair of grips 48a and 48b attached to both ends in the width direction of the front portion of the handle body 46. A locking portion 50 having a substantially oval cross-section that can be locked to a hole 68 (described later) is formed at the rear end portion of the handle body 46, and a screw hole 52 is formed at the rear end portion of the handle body 46 (see FIGS. 4 and 6). A lever 54 for a parking brake and an emergency stop switch 56 are attached near the left grip 48b on the handle body 46.

[0030] The handle portion 44 and the loading platform 12 are connected by a connecting member 58. Referring to FIG. 4, the connecting member 58 includes a slide member 60, a guide member 62, and a connecting portion 64.

[0031] Referring also to FIG. 5, the slide member 60 is reciprocally movable in the front-rear direction with respect to the loading platform 12 along with the handle portion 44, is formed in a substantially rectangular parallelepiped shape, and includes a through hole 66 extending in the front-rear direction. The through hole 66 has an oval cross-section hole 68 to which the locking portion 50 of the handle body 46 can be locked. Further referring to FIG. 6, two grooves 70 extending in the front-rear direction are formed in front of and behind the lower portion of one side surface of the slide member 60, and two grooves 70 extending in the front-rear direction are formed in front of and behind the lower portion of the other side surface of the slide member 60. A recess 72 is provided at a substantially central portion in the front-rear direction of the lower surface of the slide member 60 so as to extend in the width direction. That is, the recess 72 is provided so as to partition the two front grooves 70 and the two rear grooves 70. A hole 74 into which a pin 158 (described later) is press-fitted is formed at substantially the center of the recess 72.

[0032] The guide member 62 is provided outside the slide member 60 to guide the reciprocating movement of the slide member 60. The guide member 62 includes a first guide plate 76a provided on one side of the slide member 60, a second guide plate 76b provided on the other side, a third guide plate 78 provided above, a fourth guide plate 80 provided below, and a front plate portion 82 provided in front.

[0033] On the front side and the rear side of the upper surface of the first guide plate 76a, recesses 84a extending in the front-rear direction are respectively provided. On the inner surface of the first guide plate 76a, a groove 86a extending in the front-rear direction is provided at approximately the center in the vertical direction. The groove 86a is located below the two recesses 84a. The second guide plate 76b is configured symmetrically with the first guide plate 76a in the left-right direction. That is, the second guide plate 76b has two recesses 84b and a groove 86b similar to the two recesses 84a and the groove 86a of the first guide plate 76a. The third guide plate 78 and the fourth guide plate 80 are formed in a substantially square plate shape. A through-hole 88 for attaching the stroke sensor 146 is formed in the fourth guide plate 80. The front plate portion 82 is formed in a square plate shape, and a through-hole 90 penetrating in the front-rear direction is formed in the front plate portion 82.

[0034] The front plate portion 82 is sandwiched by the front end portions of the inner surfaces of the first guide plate 76a and the second guide plate 76b, and is connected to the first guide plate 76a and the second guide plate 76b by a plurality of bolts 92. In that state, the third guide plate 78 is attached to the upper surfaces of the first guide plate 76a, the second guide plate 76b, and the front plate portion 82 by a plurality of bolts 94, and the fourth guide plate 80 is attached to the lower surfaces of the first guide plate 76a, the second guide plate 76b, and the front plate portion 82 by a plurality of bolts 96.

[0035] The slide member 60 is housed within such a guide member 62. The handle body 46 is inserted into the through hole 66 of the slide member 60 and the through hole 90 of the front plate portion 82 from the front, and a bolt 100 is inserted into the through hole 66 of the slide member 60 from the rear with a washer 98 interposed therebetween. The bolt 100 is screwed into the screw hole 52 at the rear end portion of the handle body 46 within the slide member 60. By engaging the engaging portion 50 of the handle body 46 with the hole 68 of the slide member 60, the handle member 44 becomes non-rotatable with respect to the slide member 60. Thereby, the handle body 46 and the slide member 60 are integrated. Here, within the through hole 90 of the front plate portion 82, a dust seal 102 is interposed between the front plate portion 82 and the handle body 46. A spring 104 as an elastic member fitted around the outer periphery of the handle body 46 is provided between the front plate portion 82 and the slide member 60. By the spring 104, the slide member 60 is biased rearward.

[0036] Referring to FIGS. 4, 6 and 7, the connecting member 58 further includes four first guide rollers 106 and four second guide rollers 108. In this embodiment, the first guide rollers 106 and the second guide rollers 108 are cam followers. The first guide roller 106 includes an outer ring 106a and a mounting shaft 106b, and the second guide roller 108 includes an outer ring 108a and a mounting shaft 108b. The outer diameter of the outer ring 108a is set to be substantially equal to the width W1 of the groove 70 or slightly smaller than the width W1.

[0037] Each first guide roller 106 is provided between the slide member 60 and the guide member 62 to regulate the lateral movement of the slide member 60 while sliding the slide member 60 with respect to the guide member 62. More specifically, two first guide rollers 106 are provided between the slide member 60 and the first guide plate 76a, and two first guide rollers 106 are provided between the slide member 60 and the second guide plate 76b. Each first guide roller 106 is provided such that the mounting shaft 106b extends in the vertical direction. On the side of the first guide plate 76a, the mounting shaft 106b of one first guide roller 106 penetrates from the front recess 84a to the groove 86a and is screwed into the nut 110, and the mounting shaft 106b of the other first guide roller 106 penetrates from the rear recess 84a to the groove 86a and is screwed into the nut 110. Similarly, on the side of the second guide plate 76b, the mounting shaft 106b of one first guide roller 106 penetrates from the front recess 84b to the groove 86b and is screwed into the nut 110, and the mounting shaft 106b of the other first guide roller 106 penetrates from the rear recess 84b to the groove 86b and is screwed into the nut 110.

[0038] Each second guide roller 108 is provided between the slide member 60 and the guide member 62 to regulate the vertical movement of the slide member 60 while sliding the slide member 60 with respect to the guide member 62. More specifically, two second guide rollers 108 are provided between the slide member 60 and the first guide plate 76a, and two second guide rollers 108 are provided between the slide member 60 and the second guide plate 76b. Each second guide roller 108 is provided such that the mounting shaft 108b extends in the left-right direction (width direction). On the side of the first guide plate 76a, the outer ring 108a of one second guide roller 108 fits into a groove 70 provided at the front portion of one side surface of the slide member 60, and the mounting shaft 108b is inserted through the first guide plate 76a and screwed into the nut 112. The outer ring 108a of the other second guide roller 108 fits into a groove 70 provided at the rear portion of one side surface of the slide member 60, and the mounting shaft 108b is inserted through the first guide plate 76a and screwed into the nut 112. Similarly, on the side of the second guide plate 76b, the outer ring 108a of one second guide roller 108 fits into a groove 70 provided at the front portion of the other side surface of the slide member 60, and the mounting shaft 108b is inserted through the second guide plate 76b and screwed into the nut 112. The outer ring 108a of the other second guide roller 108 fits into a groove 70 provided at the rear portion of the other side surface of the slide member 60, and the mounting shaft 108b is inserted through the second guide plate 76b and screwed into the nut 112.

[0039] Furthermore, two parallel pins 114 are inserted between the front plate portion 82 and the first guide plate 76a, and two parallel pins 114 are inserted between the front plate portion 82 and the second guide plate 76b (see FIG. 4).

[0040] Referring to FIGS. 4 and 8 to 10, the connecting portion 64 includes a bracket 116, two holders 118a, 118b, a lock pin 120, two springs 122, and a lock lever 124.

[0041] The bracket 116 has a recess 126 and is formed in a substantially U shape. The bracket 116 is connected to the rear end faces of the first guide plate 76a and the second guide plate 76b by a plurality of bolts 128. Also, a stopper 130 fitted into the recess 126 is inserted between the rear surface of the slide member 60 and the bracket 116. The stopper 130 is made of, for example, rubber and also functions as a damper. Therefore, even when the slide member 60 receives a force from the front, the stopper 130 can prevent the rear surface of the slide member 60 from colliding with the bracket 116 and can buffer the force from the front. Also, two parallel pins 132 are inserted between the first guide plate 76a and the second guide plate 76b and the bracket 116.

[0042] The holders 118a and 118b are attached to the upper part of the front frame 18 of the loading platform 12 at intervals from each other using a plurality of fastening members 134. Both side portions of the bracket 116 are swingably attached to the holders 118a and 118b via pins 136. Two long holes 138a are provided in the holder 118a, and two long holes 138b are provided in the holder 118b. A lock pin 120 extending in the left - right direction is inserted through all the long holes 138a and 138b. A push nut 140 is fitted to the tip of the lock pin 120. Also, pins 142 are attached to the front end portions of the respective holders 118a and 118b. Inside the holder 118a, a spring 122 is attached between the lock pin 120 and the pin 142 on the holder 118a side, and inside the holder 118b, a spring 122 is attached between the lock pin 120 and the pin 142 on the holder 118b side. By the spring 122, the lock pin 120 is biased forward in the long holes 138a and 138b.

[0043] The lock lever 124 is swingably attached in the front-rear direction by a plurality of bolts 144 between the approximate center portions of the respective holders 118a and 118b, and the upper portion of the lock lever 124 is engaged with the lock pin 120. In the locked state shown in FIG. 8, the lock lever 124 is substantially vertically suspended, and the lock pin 120 is constrained substantially at the center within the elongated holes 138a and 138b and abuts against the rear end portion of the bracket 116. Thereby, the swinging of the bracket 116 and thus the handle portion 44 is prevented, and the locked state is achieved. In this locked state, the handle portion 44 is fixed by the connecting member 58 in a state of extending forward with respect to the loading platform 12. When the lower end portion of the lock lever 124 is pulled forward from this state, the lock lever 124 is rotated as a whole accordingly. Thereby, the lock pin 120 is moved rearward by the upper portion of the lock lever 124, and the bracket 116 and thus the handle portion 44 become swingable, and the lock is released. In the unlocked state, the handle portion 44 can swing in the front-rear direction (vertical direction) indicated by the arrow P with respect to the loading platform 12 (see FIG. 1), the handle portion 44 can be swung with respect to the loading platform 12 and folded, and in this state, the electric assist cart 10 can be mounted on the fire truck.

[0044] In the locked state where the handle portion 44 extends forward with respect to the loading platform 12, the slide member 60 surrounded by the guide member 62 and the bracket 116 is stroked in the front-rear direction as the handle portion 44 is pushed and pulled.

[0045] Below the slide member 60, a stroke sensor 146 is provided. The stroke sensor 146 has a throttle arm 148. The stroke sensor 146 is attached to the lower surface of the fourth guide plate 80 by a plurality of bolts 150 such that the throttle arm 148 is positioned above the fourth guide plate 80. The stroke sensor 146 does not protrude laterally from the guide member 62. The stroke sensor 146 is covered from below by an under cover 152. The under cover 152 is attached to the lower surface of the fourth guide plate 80 using a plurality of bolts 154 and a collar 156. A pin 158 is attached to the hole 74 of the recess 72 of the slide member 60 so as to extend in the vertical direction (see FIGS. 5 and 8). Referring to FIG. 11, the pin 158 is movable back and forth in the front-rear direction together with the slide member 60. The throttle arm 148 is engaged with the pin 158 and is swung as the pin 158 moves back and forth in the front-rear direction together with the slide member 60. The stroke sensor 146 detects the stroke amount of the slide member 60 based on the swing angle of the throttle arm 148.

[0046] Referring to FIGS. 4 and 9, a damper 160 is provided on the connecting member 58 to attenuate the reciprocating motion of the slide member 60. The front end portion of the damper 160 is attached to the handle body 46 via a bracket 162, and the substantially central portion of the damper 160 is attached to the first guide plate 76a by a bolt 166 via a collar 164. In this way, the damper 160 is provided so as to extend in the front-rear direction. The damper 160 can reciprocate in the front-rear direction in conjunction with the reciprocating motion of the handle portion 44 and thus the slide member 60 in the front-rear direction. In this embodiment, the slide member 60, the pin 158, and the damper 160 can all reciprocate by a stroke S, and accordingly, the throttle arm 148 can swing by an angle r (see FIGS. 9 and 11).

[0047] According to such an electric assist cart 10, the four first guide rollers 106 provided between the slide member 60 and the guide member 62 can regulate the movement of the slide member 60 in the left-right direction while sliding the slide member 60 with respect to the guide member 62. Also, the four second guide rollers 108 provided between the slide member 60 and the guide member 62 can regulate the movement of the slide member 60 in the up-down direction while sliding the slide member 60 with respect to the guide member 62. Thereby, the movement of the slide member 60 in the rotational direction can be further regulated. Therefore, even when the handle portion 44 is pulled in an arbitrary direction including the front diagonal direction, the slide member 60 capable of reciprocating along with the handle portion 44 can smoothly slide in the front-rear direction with respect to the guide member 62. As a result, the stroke amount of the slide member 60 can be appropriately detected by the stroke sensor 146, and the assist amount by the electric motors 28a and 28b can be appropriately controlled based on the detection result of the stroke sensor 146. Thus, an electric assist cart 10 with a desired assist force and good operability can be obtained.

[0048] The two first guide rollers 106 provided between the slide member 60 and the first guide plate 76a and the two first guide rollers 106 provided between the slide member 60 and the second guide plate 76b support the slide member 60 slidably in the front-rear direction from both sides, and can appropriately regulate the movement of the slide member 60 in the left-right direction.

[0049] The slide member 60 is supported from one side in the front-rear direction so as to be slidable by two second guide rollers 108 provided between the slide member 60 and the first guide plate 76a and fitted into the corresponding grooves 70. The slide member 60 is supported from the other side in the front-rear direction so as to be slidable by two second guide rollers 108 provided between the slide member 60 and the second guide plate 76b and fitted into the corresponding grooves 70. Here, since each second guide roller 108 is fitted into the corresponding groove 70 extending in the front-rear direction, it can move in the front-rear direction along the groove 70, but is restricted from moving in a direction perpendicular to the front-rear direction, and the up-and-down movement of the slide member 60 can be regulated. Therefore, compared with the case where second guide rollers are provided on the upper and lower surfaces of both the left and right sides of the slide member, the up-and-down movement of the slide member 60 can be appropriately regulated by a small number of second guide rollers 108.

[0050] In a state where the handle portion 44 is not folded, the stroke sensor 146 is not located above the slide member 60, so it is difficult to receive a load from above. Therefore, damage to the stroke sensor 146 can be suppressed against a load from above.

[0051] Even if the handle portion 44 is suddenly pushed or pulled, the damper 160 can attenuate the sudden reciprocating motion of the slide member 60 and thus the handle portion 44. As a result, a sudden change in the stroke amount of the slide member 60 can be alleviated, so that a sudden change in the assist amount can be suppressed. As a result, an electric assist cart 10 with an assist amount that changes smoothly and good operability can be obtained.

[0052] Since the first guide roller 106 and the second guide roller 108 each consist of a cam follower, the first guide roller 106 and the second guide roller 108 can be easily configured. Also, with a compact configuration, rotation regulation of the slide member 60 with respect to the operation of the handle portion 44 can be realized.

[0053] The first guide roller 106 and the second guide roller 108 are provided on the sides of the slide member 60 and are not provided above and below the slide member 60. Therefore, the thicknesses of the third guide plate 78 and the fourth guide plate 80 can be reduced, and the vertical dimension of the guide member 62 can be reduced.

[0054] The electric assist cart 10 according to the present invention can be suitably used for a hose car that can load a fire hose on a loading platform.

[0055] In the above-described embodiment, the groove 70 that extends in the front-rear direction and into which the second guide roller 108 fits is provided in the slide member 60, but is not limited thereto. The groove that extends in the front-rear direction and into which the second guide roller 108 fits may be provided in the first guide plate as long as it is the opposing surface between the slide member and the first guide plate. Further, the groove that extends in the front-rear direction and into which the second guide roller 108 fits may be provided in the second guide plate as long as it is the opposing surface between the slide member and the second guide plate.

[0056] In the above-described embodiment, two grooves 70 that extend in the front-rear direction are formed on the opposing surface between the slide member 60 and the first guide plate 76a, but are not limited thereto. One groove that extends in the front-rear direction and into which two second guide rollers 108 fit may be formed on the opposing surface. Also, two grooves 70 that extend in the front-rear direction are formed on the opposing surface between the slide member 60 and the second guide plate 76b, but are not limited thereto. One groove that extends in the front-rear direction and into which two second guide rollers 108 fit may be formed on the opposing surface.

[0057] In the above-described embodiment, four first guide rollers 106 and four second guide rollers 108 are each used, but are not limited thereto.

[0058] At least two or more first guide rollers 106 may be provided between the slide member and the guide member, and at least two or more second guide rollers 108 may be provided between the slide member and the guide member.

[0059] Referring to FIG. 12, an embodiment will be described in which three first guide rollers 106 and three second guide rollers 108 are used respectively.

[0060] The connecting member 58a according to this embodiment includes a slide member 60a and a guide member 62a.

[0061] At substantially the center of the lower part of one side surface of the slide member 60a, one groove 70 extending in the front-rear direction is formed. On the front and rear of the lower part of the other side surface of the slide member 60a, two grooves 70 extending in the front-rear direction are formed. At the center rear part of the upper surface of the slide member 60a, one groove 168 extending in the front-rear direction is formed. At the substantially central part in the front-rear direction of the lower surface of the slide member 60a, a recess 72a is provided. Since the other configurations of the slide member 60a are the same as those of the slide member 60, duplicate descriptions are omitted.

[0062] The guide member 62a includes a first guide plate 170a provided on one side of the slide member 60a, a second guide plate 170b provided on the other side, a third guide plate 172 provided above, a fourth guide plate 80 provided below, and a front plate portion 82 provided in the front. The fourth guide plate 80 and the front plate portion 82 are the same as those in the previous embodiment.

[0063] On the front part of the upper surface of the first guide plate 170a, one recess 84a extending in the front-rear direction is provided. On the inner side surface of the first guide plate 170a, a groove 86a extending in the front-rear direction is provided at substantially the center in the vertical direction, similar to the previous embodiment (see FIG. 4). The groove 86a is located at least below the recess 84a. The second guide plate 170b is configured substantially symmetrically with the first guide plate 170a in the left-right direction. That is, the second guide plate 170b has one recess 84b and one groove 86b similar to one recess 84a and one groove 86a of the first guide plate 170a. The third guide plate 172 is formed in a substantially square plate shape with a certain thickness.

[0064] Furthermore, the connecting member 58a includes three first guide rollers 106 and three second guide rollers 108. Also in this embodiment as in the previous embodiment, the first guide rollers 106 and the second guide rollers 108 are cam followers. The first guide roller 106 includes an outer ring 106a and a mounting shaft 106b, and the second guide roller 108 includes an outer ring 108a and a mounting shaft 108b. The outer diameter of the outer ring 106a is set to be substantially equal to or slightly smaller than the width W2 of the groove 168, and the outer diameter of the outer ring 108a is set to be substantially equal to or slightly smaller than the width W1 of the groove 70.

[0065] One first guide roller 106 is provided between the slide member 60a and the first guide plate 170a, one first guide roller 106 is provided between the slide member 60a and the second guide plate 170b, and one first guide roller 106 is provided between the slide member 60a and the third guide plate 172. Each first guide roller 106 is provided such that the mounting shaft 106b extends in the vertical direction. On the side of the first guide plate 170a, the mounting shaft 106b of one first guide roller 106 penetrates from the recess 84a to the groove 86a and is screwed into the nut 110. On the side of the second guide plate 170b, the mounting shaft 106b of one first guide roller 106 penetrates from the recess 84b to the groove 86b and is screwed into the nut 110. Further, the outer ring 106a of one first guide roller 106 fits into the groove 168 provided on the upper surface of the slide member 60a, and the mounting shaft 106b is inserted through the third guide plate 172 and is screwed into the nut 110.

[0066] Between the slide member 60a and the first guide plate 170a, one second guide roller 108 is provided, and between the slide member 60a and the second guide plate 170b, two second guide rollers 108 are provided. Each second guide roller 108 is provided such that the mounting shaft 108b extends in the left-right direction (width direction). On the side of the first guide plate 170a, the outer ring 108a of one second guide roller 108 fits into a groove 70 provided substantially at the center of the lower part of one side surface of the slide member 60a, and the mounting shaft 108b is inserted into the first guide plate 170a and screwed into the nut 112. On the side of the second guide plate 170b, the outer ring 108a of one second guide roller 108 fits into a groove 70 provided at the front part of the other side surface of the slide member 60a, and the mounting shaft 108b is inserted into the second guide plate 170b and screwed into the nut 112. The outer ring 108a of the other second guide roller 108 fits into a groove 70 provided at the rear part of the other side surface of the slide member 60a, and the mounting shaft 108b is inserted into the second guide plate 170b and screwed into the nut 112.

[0067] Regarding the other configurations of the connecting member 58a, since they are the same as those of the connecting member 58 in the previous embodiment, redundant descriptions are omitted.

[0068] According to this embodiment, the three first guide rollers 106 provided between the slide member 60a and the guide member 62a can regulate the movement of the slide member 60a in the left-right direction while sliding the slide member 60a with respect to the guide member 62a. Also, the three second guide rollers 108 provided between the slide member 60a and the guide member 62a can regulate the movement of the slide member 60a in the up-down direction while sliding the slide member 60a with respect to the guide member 62a. Thereby, the movement of the slide member 60a in the rotational direction can be further regulated.

[0069] One first guide roller 106 provided between the slide member 60a and the first guide plate 170a, one first guide roller 106 provided between the slide member 60a and the second guide plate 170b, and one first guide roller 106 provided between the slide member 60a and the third guide plate 172 and fitted into the groove 168 support the slide member 60a slidably in the front-rear direction not only from both sides but also from above, and can appropriately restrict the movement of the slide member 60a in the left-right direction. Here, since the first guide roller 106 provided between the slide member 60a and the third guide plate 172 is fitted into the groove 168 extending in the front-rear direction, it can move in the front-rear direction along the groove 168, but is suppressed from moving in a direction perpendicular to the front-rear direction, and can restrict the movement of the slide member 60a in the left-right direction. Therefore, the movement of the slide member 60a in the left-right direction can be restricted by a small number of first guide rollers 106.

[0070] One second guide roller 108 provided between the slide member 60a and the first guide plate 170a and fitted into the groove 70 supports the slide member 60a slidably in the front-rear direction from one side, and two second guide rollers 108 provided between the slide member 60a and the second guide plate 170b and fitted into the corresponding groove 70 support the slide member 60a slidably in the front-rear direction from the other side. Here, since each second guide roller 108 is fitted into the corresponding groove 70 extending in the front-rear direction, it can move in the front-rear direction along the groove 70, but is suppressed from moving in a direction perpendicular to the front-rear direction, and can restrict the movement of the slide member 60a in the up-down direction. Therefore, the movement of the slide member 60a in the up-down direction can be appropriately restricted by an even smaller number of second guide rollers 108.

[0071] In the embodiment shown in FIG. 12, the groove 168 that extends in the front-rear direction and into which the first guide roller 106 fits is provided on the slide member 60a, but is not limited thereto. The groove that extends in the front-rear direction and into which the first guide roller 106 fits may be provided on the third guide plate as long as it is the opposing surface between the slide member and the third guide plate. Further, the groove that extends in the front-rear direction and into which the first guide roller 106 fits may be provided on the slide member or the fourth guide plate as long as it is the opposing surface between the slide member and the fourth guide plate. In this case, one first guide roller is provided between the slide member and the fourth guide plate.

[0072] In the embodiment shown in FIG. 12, the groove 70 that extends in the front-rear direction and into which the second guide roller 108 fits is provided on the slide member 60a, but is not limited thereto. The groove that extends in the front-rear direction and into which the second guide roller 108 fits may be provided on the first guide plate as long as it is the opposing surface between the slide member and the first guide plate. Further, the groove that extends in the front-rear direction and into which the second guide roller 108 fits may be provided on the second guide plate as long as it is the opposing surface between the slide member and the second guide plate.

[0073] In the embodiment shown in FIG. 12, two grooves 70 extending in the front-rear direction are formed on the opposing surface between the slide member and the second guide plate, but are not limited thereto. One groove that extends in the front-rear direction and into which two second guide rollers 108 fit may be formed on the said opposing surface.

[0074] In the embodiment shown in FIG. 12, the left and right configurations may be swapped. That is, it may be configured such that the side of the first guide plate 170a where one groove 70 and one second guide roller 108 are provided is located on the left, and the side of the second guide plate 170b where two grooves 70 and two second guide rollers 108 are provided is located on the right.

[0075] Furthermore, referring to FIG. 13, an embodiment in which two first guide rollers 106 and two second guide rollers 108 are respectively used will be described.

[0076] The connecting member 58b according to this embodiment includes a slide member 60b and a guide member 62b.

[0077] One groove 70 extending in the front-rear direction is formed slightly below the center of one side surface of the slide member 60b, and one groove 70 extending in the front-rear direction is formed slightly below the center of the other side surface of the slide member 60b. Also, two grooves 168 extending in the front-rear direction are formed at the front and rear of the center of the upper surface of the slide member 60b, respectively. Since the other configurations of the slide member 60b are the same as those of the slide member 60, redundant descriptions are omitted.

[0078] The guide member 62b includes a first guide plate 174a provided on one side of the slide member 60b, a second guide plate 174b provided on the other side, a third guide plate 176 provided above, a fourth guide plate 80 provided below, and a front plate portion 82 provided in front. The first guide plate 174a, the second guide plate 174b, and the third guide plate 176 are formed in a substantially square plate shape with a certain thickness. The fourth guide plate 80 and the front plate portion 82 are the same as those in the previous embodiment.

[0079] Furthermore, the connecting member 58b includes two first guide rollers 106 and two second guide rollers 108. Also in this embodiment, similar to the previous embodiment, the first guide roller 106 and the second guide roller 108 are cam followers. The first guide roller 106 includes an outer ring 106a and a mounting shaft 106b, and the second guide roller 108 includes an outer ring 108a and a mounting shaft 108b. The outer diameter of the outer ring 106a is set to be substantially equal to the width W2 of the groove 168 or slightly smaller than the width W2, and the outer diameter of the outer ring 108a is set to be substantially equal to the width W1 of the groove 70 or slightly smaller than the width W1.

[0080] Between the slide member 60b and the third guide plate 176, two first guide rollers 106 are provided. Each first guide roller 106 is provided such that the mounting shaft 106b extends in the vertical direction. The outer ring 106a of one first guide roller 106 fits into a groove 168 provided at the front portion of the upper surface of the slide member 60b, and the mounting shaft 106b is inserted through the third guide plate 176 and screwed into the nut 110. The outer ring 106a of the other first guide roller 106 fits into a groove 168 provided at the rear portion of the upper surface of the slide member 60b, and the mounting shaft 106b is inserted through the third guide plate 176 and screwed into the nut 110.

[0081] Between the slide member 60b and the first guide plate 174a, one second guide roller 108 is provided, and between the slide member 60b and the second guide plate 174b, one second guide roller 108 is provided. Each second guide roller 108 is provided such that the mounting shaft 108b extends in the left - right direction (width direction). On the side of the first guide plate 174a, the outer ring 108a of one second guide roller 108 fits into a groove 70 provided slightly below the central portion of one side surface of the slide member 60b, and the mounting shaft 108b is inserted through the first guide plate 174a and screwed into the nut 112. On the side of the second guide plate 174b, the outer ring 108a of one second guide roller 108 fits into a groove 70 provided slightly below the central portion of the other side surface of the slide member 60b, and the mounting shaft 108b is inserted through the second guide plate 174b and screwed into the nut 112.

[0082] Regarding the other configurations of the connecting member 58b, since they are the same as those of the connecting member 58 in the previous embodiment, duplicate explanations are omitted.

[0083] According to this embodiment, the two first guide rollers 106 provided between the slide member 60b and the guide member 62b can regulate the lateral movement of the slide member 60b while sliding the slide member 60b relative to the guide member 62b. Also, the two second guide rollers 108 provided between the slide member 60b and the guide member 62b can regulate the vertical movement of the slide member 60b while sliding the slide member 60b relative to the guide member 62b. Thereby, the rotational movement of the slide member 60b can be further regulated.

[0084] The slide member 60b is supported from above so as to be slidable in the front-rear direction by two first guide rollers 106 provided between the slide member 60b and the third guide plate 176 and fitted into the corresponding grooves 168. Here, since the two first guide rollers 106 are fitted into the corresponding grooves 168 extending in the front-rear direction, they can move in the front-rear direction along the grooves 168, but are suppressed from moving in a direction perpendicular to the front-rear direction, and the lateral movement of the slide member 60b can be regulated. Therefore, the lateral movement of the slide member 60b can be appropriately regulated by a smaller number of first guide rollers 106.

[0085] The slide member 60b is supported from one side so as to be slidable in the front-rear direction by one second guide roller 108 provided between the slide member 60b and the first guide plate 174a and fitted into the groove 70, and the slide member 60b is supported from the other side so as to be slidable in the front-rear direction by one second guide roller 108 provided between the slide member 60b and the second guide plate 174b and fitted into the groove 70. Here, since each second guide roller 108 is fitted into the corresponding groove 70 extending in the front-rear direction, it can move in the front-rear direction along the groove 70, but is suppressed from moving in a direction perpendicular to the front-rear direction, and the vertical movement of the slide member 60b can be regulated. Therefore, the vertical movement of the slide member 60b can be appropriately regulated by an even smaller number of second guide rollers 108.

[0086] In the embodiment shown in FIG. 13, the groove 168 that extends in the front-rear direction and into which the first guide roller 106 fits is provided on the slide member 60b, but is not limited thereto. The groove that extends in the front-rear direction and into which the first guide roller 106 fits may be provided on the third guide plate as long as it is the opposing surface between the slide member and the third guide plate. Further, the groove that extends in the front-rear direction and into which the first guide roller 106 fits may be provided on the slide member or the fourth guide plate as long as it is the opposing surface between the slide member and the fourth guide plate. In this case, two first guide rollers are provided between the slide member and the fourth guide plate.

[0087] In the embodiment shown in FIG. 13, two grooves 168 extending in the front-rear direction are formed on the opposing surface between the slide member and the third guide plate, but are not limited thereto. One groove that extends in the front-rear direction and into which two first guide rollers 106 fit may be formed on the opposing surface. The same applies when the groove that extends in the front-rear direction and into which the first guide roller 106 fits is formed on the opposing surface between the slide member and the fourth guide plate.

[0088] In the embodiment shown in FIG. 13, the groove 70 that extends in the front-rear direction and into which the second guide roller 108 fits is provided on the slide member 60b, but is not limited thereto. The groove that extends in the front-rear direction and into which the second guide roller 108 fits may be provided on the first guide plate as long as it is the opposing surface between the slide member and the first guide plate. Further, the groove that extends in the front-rear direction and into which the second guide roller 108 fits may be provided on the second guide plate as long as it is the opposing surface between the slide member and the second guide plate.

[0089] In the embodiment shown in FIG. 6, four first guide rollers 106 and four second guide rollers 108 are used respectively. In the embodiment shown in FIG. 12, three first guide rollers 106 and three second guide rollers 108 are used respectively. In the embodiment shown in FIG. 13, two first guide rollers 106 and two second guide rollers 108 are used respectively. However, these combinations may be changed as appropriate. That is, it may be any combination of four first guide rollers 106 and two or three second guide rollers 108, three first guide rollers 106 and two or four second guide rollers 108, or two first guide rollers 106 and three or four second guide rollers 108.

[0090] Further, in the present invention, at least one of the slide member and the guide member may be configured to have at least one groove extending in the front-rear direction and into which the first guide roller or the second guide roller fits. In this case, the first guide roller or the second guide roller provided between the slide member and the guide member fits into a groove formed so as to extend in the front-rear direction in either the slide member or the guide member. Here, the first guide roller or the second guide roller fitted into the groove can move in the front-rear direction along the groove, but is suppressed from moving in a direction perpendicular to the front-rear direction. Therefore, by fitting the first guide roller into the groove, the movement of the slide member in the left-right direction can be restricted by one guide roller. Also, by fitting the second guide roller into the groove, the movement of the slide member in the up-down direction can be restricted by one guide roller. As a result, the movement of the slide member can be restricted by a small number of guide rollers.

[0091] Roller followers may be used for the first guide roller and the second guide roller. In this case, preferably, an attachment shaft extending in the axial direction is attached to the inner ring of the roller follower, and the same effect as in the case of using a cam follower can be obtained.

[0092] The driving of the pair of wheels 24a, 24b may be assisted by one electric motor.

[0093] The present invention is not limited to a hose cart and can be applied to any electric assist trolley.

Explanation of Signs

[0094] 10 Electric assist trolley 12 Loading platform 24a, 24b Wheels 28a, 28b Electric motors 34 Control unit 44 Handle part 58, 58a, 58b Connecting members 60, 60a, 60b Slide members 62, 62a, 62b Guide members 64 Connection part 70, 86a, 86b, 168 Grooves 76a, 170a, 174a First guide plates 76b, 170b, 174b Second guide plates 78, 172, 176 Third guide plates 80 Fourth guide plate 82 Front plate part 104, 122 Springs 106 First guide roller 108 Second guide roller 146 Stroke sensor 160 Damper

Claims

1. The loading platform and A pair of wheels provided on the platform; an electric motor for assisting the driving of the pair of wheels; A handle portion provided in front of the loading platform for towing the loading platform; a connecting member that connects the handle portion and the loading platform, the connecting member including a slide member that can reciprocate in a front-rear direction relative to the loading platform in association with the handle portion and a guide member that is provided outside the slide member to guide the reciprocating movement of the slide member; an elastic member provided on the handle portion for biasing the slide member rearward; a stroke sensor for detecting a stroke amount of the slide member; a control unit that controls an amount of assist by the electric motor based on a detection result of the stroke sensor, The connecting member is at least two first guide rollers provided between the slide member and the guide member to restrict left-right movement of the slide member while sliding the slide member relative to the guide member; The electrically assisted cart further includes at least two second guide rollers provided between the slide member and the guide member to regulate the upward and downward movement of the slide member while sliding the slide member relative to the guide member.

2. The electrically assisted cart according to claim 1 , wherein at least one of the slide member and the guide member has at least one groove extending in the front-rear direction and into which the first guide roller or the second guide roller fits.

3. The guide member includes a first guide plate provided on one side of the slide member and a second guide plate provided on the other side of the slide member, Two of the first guide rollers are provided between the slide member and the first guide plate, The electrically assisted cart according to claim 1 , wherein two of the first guide rollers are provided between the slide member and the second guide plate.

4. the guide member includes a first guide plate provided on one side of the slide member, a second guide plate provided on the other side, a third guide plate provided above, and a fourth guide plate provided below, a first guide roller is provided between the slide member and the first guide plate; The first guide roller is provided between the slide member and the second guide plate, a first guide roller is provided between the slide member and the third guide plate or the fourth guide plate; The electrically assisted cart according to claim 1 , wherein a groove extending in the front-rear direction and into which the first guide roller fits is provided on an opposing surface between the slide member and the third guide plate or the fourth guide plate.

5. the guide member includes a first guide plate provided on one side of the slide member, a second guide plate provided on the other side, a third guide plate provided above, and a fourth guide plate provided below, Two of the first guide rollers are provided between the slide member and the third guide plate or the fourth guide plate, The electrically assisted cart according to claim 1 , wherein at least one groove extending in the front-rear direction and into which the corresponding first guide roller fits is provided on the opposing surfaces of the slide member and the third guide plate or the fourth guide plate.

6. Two of the second guide rollers are provided between the slide member and the first guide plate, and at least one groove extending in the front-rear direction and into which the corresponding second guide roller fits is provided on the opposing surface between the slide member and the first guide plate, An electric assisted cart as described in any one of claims 3 to 5, wherein two second guide rollers are provided between the slide member and the second guide plate, and at least one groove extending in the front-rear direction and into which a corresponding one of the second guide rollers fits is provided on the opposing surface between the slide member and the second guide plate.

7. The second guide roller is provided between the slide member and the first guide plate, and a groove is provided on the opposing surface between the slide member and the first guide plate, the groove extending in the front-rear direction and into which the second guide roller is fitted, An electric assisted cart as described in any one of claims 3 to 5, wherein two second guide rollers are provided between the slide member and the second guide plate, and at least one groove extending in the front-rear direction and into which a corresponding one of the second guide rollers fits is provided on the opposing surface between the slide member and the second guide plate.

8. The second guide roller is provided between the slide member and the first guide plate, and a groove is provided on the opposing surface between the slide member and the first guide plate, the groove extending in the front-rear direction and into which the second guide roller is fitted, An electric assisted cart as described in any one of claims 3 to 5, wherein one second guide roller is provided between the slide member and the second guide plate, and a groove extending in the front-rear direction and into which the second guide roller fits is provided on the opposing surface between the slide member and the second guide plate.

9. The electrically assisted cart according to claim 1 , wherein the stroke sensor is provided below the slide member.

10. The electric assisted cart according to claim 1 , further comprising a damper provided on the connecting member for damping reciprocating motion of the sliding member.

11. The electrically assisted cart according to claim 1 , wherein each of the first guide roller and the second guide roller includes a cam follower or a roller follower.

12. The electrically assisted cart according to any one of claims 1 to 11, which is a hose cart capable of carrying a fire hose on the loading platform.

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