Lifting machine

Abstract

To provide a lifting machine capable of easily removing a clamping member from an object to be lifted. [Solution] The lifting machine includes a frame (50), a handle, a caster unit, and a clamping unit (2) configured to clamp a gutter cover. The clamping unit (2) includes a pair of rotating plates (30a, 30b) that overlap when viewed from the Y direction, a pair of clamping members that press against the side surfaces of the cover while clamped, a clamping and rotation support structure (20) that rotatably supports the pair of rotating plates (30a, 30b) about a rotation axis (J2) extending in the Y direction, and a tipping and rotation support structure (10) that rotatably supports the clamping and rotation support structure (20) about a rotation axis (J1) extending in the X direction. The axis height (H1) is set to be lower than twice the height (H2) of the rotating plates. When an external force is applied to the tipping and rotation support structure (10) in the Y direction, the pair of clamping members rotate about the rotation axis (J1) so that the clamping unit (2) falls on the top surface of the cover, thereby separating from the side surfaces of the cover.

Description

[Technical Field]

[0001] The present invention relates to a lifting machine. [Background technology]

[0002] The gutter cover lifting device described in Patent Document 1 comprises an arm portion consisting of a claw portion that abuts the bottom surface of the gutter cover, a hanging portion that abuts the side surface of the gutter cover, and a bent portion formed above the hanging portion, a base that suspends the pair of arm portions in parallel with the claw portions facing inward, and an engagement means that rotatably engages the arm portion with the base that suspends the pair of arm portions. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 1-180584 Summary of the Invention [Problem to be solved by the invention]

[0004] In the configuration described in Patent Document 1, after the gutter cover is clamped between the claw portion and the hanging portion and transported, it is difficult to remove the claw portion and the hanging portion from the gutter cover.

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a lifting machine that allows the clamping member to be easily removed from the object to be lifted. [Means for solving the problem]

[0006] In order to achieve the above object, the lifting machine according to the present invention comprises: A lifting machine that lifts an object to be lifted in a clamped state in which the object to be lifted is clamped by pressing the clamps against both opposing sides of the object to be lifted, A rod-shaped frame; a handle portion provided at an upper end of the frame and gripped by a user; a caster unit having casters that roll on the ground, attached to the frame, and supporting the frame from below; a clamping unit connected to a lower end of the frame so as to cross the frame and configured to be able to clamp the object to be lifted, The clamping unit includes: a pair of rotating plates extending in a longitudinal direction of the clamping unit and overlapping each other when viewed from a depth direction perpendicular to the longitudinal direction; a pair of clamping members fixed to the longitudinal outer sides of the pair of rotating plate members and pressing against the both side surfaces in the clamping state; a clamping and rotational support structure that is located at the center of the pair of rotating plate members in the longitudinal direction and that rotatably supports the pair of rotating plate members together with the pair of clamping members around a first rotation axis that extends in the depth direction, and that rotatably supports the pair of rotating plate members between an overlapping state in which the pair of rotating plate members are overlapped as viewed from the depth direction, and an X-shaped crossing state as viewed from the depth direction; a tumble and turn support structure that is located above the clamping and turning support structure in the clamping state and that rotatably supports the clamping and turning support structure together with the pair of turning plate members and the pair of clamping members around a second turning axis that extends in the longitudinal direction of the clamping unit, In a preparatory state in which the lower surfaces of the pair of rotating plate members are placed on the upper surface of the object to be lifted, a height of the second rotating shaft based on the upper surface is set to be lower than twice the height of the pair of rotating plate members based on the upper surface in the preparatory state, When an external force in the depth direction is applied to the tipping and rotating support structure from the handle portion via the frame in the ready state, the pair of clamping members are configured to rotate around the second rotation axis so that the clamping unit falls onto the top surface and moves away from the both side surfaces. [Effects of the Invention]

[0007] According to the present invention, the clamping member can be easily removed from the object to be lifted. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view of a lifting machine according to an embodiment of the present invention; [Figure 2] 1 is a perspective view of a clamping unit in a ready state according to an embodiment of the present invention; FIG. [Figure 3] 1 is a perspective view of a clamping unit in a tilted state according to an embodiment of the present invention; FIG. [Figure 4] 1 is a perspective view of a clamping unit in a crossed state according to an embodiment of the present invention; FIG. [Figure 5] 1A and 1B are cross-sectional views of a clamping unit according to an embodiment of the present invention. [Figure 6] 1 is a perspective view of a caster unit according to an embodiment of the present invention; FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] A lifting machine according to one embodiment of the present invention will be described with reference to the drawings. As shown in Figures 1 to 4, the lifting machine 1 presses against each of the two cover sides A1 of the gutter cover A, clamping the gutter cover A, lifting and transporting the gutter cover A, and then releasing the clamped state of the gutter cover A after transport.

[0010] The lifting machine 1 includes a frame 50, a handle portion 55, a reinforcing member 58, a caster unit 60, and a clamping unit 2.

[0011] The frame 50 is rod-shaped and extends between the handle portion 55 and the clamping unit 2. The frame 50 is generally L-shaped or V-shaped with an obtuse angle. The frame 50 comprises a first frame portion 51 and a second frame portion 52. The first frame portion 51 extends from the clamping unit 2 along the ground G. The second frame portion 52 is connected to the end of the first frame portion 51 opposite the clamping unit 2, and is inclined upward relative to the first frame portion 51, moving away from the ground G as it approaches the handle portion 55. The frame 50 is composed of two adjacent cylindrical pipes that are parallel to each other. The frame 50 is not limited to being made up of two cylindrical pipes, but may be made up of one rectangular pipe.

[0012] Reinforcing member 58 is provided to increase the strength of frame 50, and is generally rod-shaped and linearly connects both ends of frame 50. One end of reinforcing member 58 is fastened to the end of frame 50 on the handle portion 55 side, and the other end of reinforcing member 58 is fastened to the end of frame 50 on the clamping unit 2 side.

[0013] The handle portion 55 is located at the upper end of the frame 50 and extends outward to the left and right as seen from the user so that the user can grip it with both hands. The handle portion 55 is formed by the frame 50 and a series of two cylindrical pipes that are bent in opposite directions.

[0014] The caster unit 60 is attached to a non-end portion of the first frame portion 51 and supports the first frame portion 51 from the ground G side. As shown in FIG. 6, the caster unit 60 includes a plurality of casters 61, a base portion 62, and a pipe fixing portion 63. The plurality of casters 61 rotate around a rotation axis that is perpendicular to the first frame portion 51 and parallel to the ground G below the base portion 62. The plurality of (two) casters 61 are aligned in the direction in which this rotation axis extends. The rotation of the casters 61 on the ground G makes it easy to move the lifting machine 1.

[0015] The pipe fixing portion 63 is located on the upper surface of the rectangular parallelepiped base portion 62 and is fixed to the first frame portion 51 by a plurality of bolts B1. With each bolt B1 loosened, the position of the caster unit 60 can be adjusted on the first frame portion 51 in the extension direction of the first frame portion 51. After the position adjustment, the caster unit 60 is fixed to the first frame portion by tightening each bolt B1.

[0016] The clamping unit 2 is located at the end of the frame 50 opposite the handle portion 55, and clamps the gutter cover A. The clamping unit 2 is formed so as to form a T-shape together with the first frame portion 51 when viewed from above. In the following description, the longitudinal direction of the clamping unit 2 when the clamping unit 2 is clamping the gutter cover A is referred to as the X direction, and the depth direction perpendicular to the X direction is referred to as the Y direction.

[0017] As shown in FIGS. 2 to 4, the clamping unit 2 includes a tumble and turn support structure 10, a clamping and turn support structure 20, a pair of turning plates 30a and 30b, and a pair of clamping members 40a and 40b.

[0018] The pair of rotating plates 30a, 30b are each formed long in the X direction and are arranged so as to overlap when viewed from the Y direction. The pair of rotating plates 30a, 30b are configured to be rotatable about the same rotation axis J2 by ​​the clamping rotation support structure 20. The rotation axis J2 is located at the center of the longitudinal direction of the rotating plates 30a, 30b. Therefore, the rotating plates 30a, 30b change their state between an overlapping state (see FIG. 2) in which they overlap when viewed from the Y direction, and an X-shaped crossing state (see FIG. 4) in which they rotate from this overlapping state about the rotation axis J2.

[0019] Each of the rotating plates 30a, 30b includes a main plate portion 31 and a bottom plate portion 32. The rotating plates 30a, 30b have substantially the same shape and are formed so as to face opposite sides in the Y direction. The main body plate portion 31 has a rectangular plate shape that has a thickness in the Y direction and extends in the X direction. In the overlapping state, the main body plate portions 31 of the rotating plates 30a, 30b are overlapped in the Y direction. The bottom plate portion 32 extends from the lower end of the main body plate portion 31 in a direction perpendicular to the main body plate portion 31. The bottom plate portion 32 of the rotating plate member 30a extends away from the handle portion 55, and the bottom plate portion 32 of the rotating plate member 30b extends towards the handle portion 55. In the clamped state, each bottom plate portion 32 is positioned so as to face or contact the lid upper surface A2. 4, the main body plate portion 31 of the rotating plate member 30a has a restricting portion 35 that comes into contact with the upper end of the main body plate portion 31 of the rotating plate member 30b in the crossed state. The restricting portion 35 restricts an increase in the angle formed by the rotating plates 30a and 30b in the crossed state.

[0020] The pair of clamping members 40a, 40b are located at the outer ends in the X direction of the rotating plate members 30a, 30b, respectively. The pair of clamping members 40a, 40b press against the two cover side surfaces A1 extending in the Y direction, respectively, to clamp the gutter cover A. The clamping member 40a is fixed to one end of the rotating plate member 30a, and the clamping member 40b is fixed to the other end of the rotating plate member 30b. Each of the clamping members 40a, 40b has an L-shape extending in the Y direction. Each of the clamping members 40a, 40b has two wall portions 41, 42 connected to form an L-shape. The outer surface of the wall portion 41 is fixed to the outer lower end surface in the X direction of the rotating plate members 30a, 30b. The wall portion 42 extends downward from the outer end portion in the X direction of the wall portion 41. In the clamping state, the inner surface in the X direction of the wall portion 42 is pressed against the lid side surface A1.

[0021] As shown in FIGS. 5(A) and 5(B), the clamping, rotating, and supporting structure 20 supports the rotating plates 30a and 30b so that they can rotate about a rotation axis J2. The sandwiching and rotating support structure 20 includes an upper portion 21, a pair of sandwiching walls 22, and a rotating support shaft B2. The pair of sandwiching walls 22 face each other so as to sandwich the main body plate portions 31 of the rotating plate members 30a, 30b from the Y direction. The upper portion 21 is configured to connect the pair of sandwiching walls 22 to the upper ends of the pair of sandwiching walls 22. A rotation support shaft B2, which is made up of a bolt and a nut, is inserted onto the rotation shaft J2, and the shaft portion of the rotation support shaft B2 passes through the lower end of the sandwiching wall portion 22 and through holes that penetrate in the Y direction through each main body plate portion 31. This allows the rotation plates 30a and 30b to rotate around the rotation shaft J2.

[0022] The tumble and pivot support structure 10 supports the clamping unit 2 so that it can pivot about a pivot axis J1 between an upright position (see the solid line in FIG. 5(B)) and an inverted position (see the dashed-dotted line in FIG. 5(B)). The pivot axis J1 is located above the pivot axis J2 and extends in the Y direction, which is perpendicular to the pivot axis J2. In the upright state (see the solid line in FIG. 5(B)), in the sandwiched state, the main body plate portions 31 of the rotating plate members 30a and 30b stand upright on the cover upper surface A2. In the inverted state (see the dotted line in Figure 5(B)), each clamping member 40a, 40b is in a non-clamping state, spaced upward from the lid side surface A1, and each main body plate portion 31 of the rotating plate members 30a, 30b is in a direction along the lid top surface A2.

[0023] As shown in Figure 5(A), the tumble and pivot support structure 10 includes a pair of side walls 12, a top wall 11, and a pivot support shaft B3. The pair of side walls 12 are aligned in the X direction so as to sandwich the upper portion 21 of the clamping and pivoting support structure 20. The top wall 11 is plate-shaped and extends along the XY direction, connecting the upper ends of the pair of side walls 12. An end of a frame 50 is located on the underside of the top wall 11, and the frame 50 is fixed to the top wall 11 with bolts B4.

[0024] A rotation support shaft B3, which is made up of a bolt and a nut, is inserted onto the rotation shaft J1, and the shaft portion of the rotation support shaft B3 passes through a through-hole that penetrates the pair of side wall portions 12 and the upper portion 21 in the X direction. This allows the rotating plates 30a and 30b to rotate about the rotation shaft J1 via the clamping and rotating support structure 20. A stopper St is provided on the shaft portion of the rotation support shaft B3 to restrict movement of the clamping and rotating support structure 20 in the X direction.

[0025] In Figure 5(B), the bottom surface 32 of each of the rotating plates 30a, 30b is resting on the lid upper surface A2 in a preparatory state. This preparatory state is the state before transitioning to the tipping state or the clamping state. In this preparatory state, the rotating plates 30a, 30b are in an overlapping state with most of them overlapping when viewed from the Y direction, and each clamping member 40a, 40b is positioned opposite the lid side surface A1 but is not pressed against it, so no force is generated to clamp the gutter lid A. In this prepared state, as shown in FIG. 5(A), the height of the rotation axis J1 with respect to the upper surface A2 of the lid is the axis height H1. Also, in this prepared state, the height of each rotating plate member 30a, 30b (accurately, the main body plate portion 31) with respect to the upper surface A2 of the lid is the rotating plate member height H2. The axis height H1 is positioned lower than the double height Hd which is twice the rotating plate member height H2 with respect to the upper surface A2 of the lid. That is, "H1 < H2 × 2" holds. By thus making the axis height H1 low, as will be described later, the transition from the prepared state to the overturned state becomes smooth.

[0026] Next, the usage method of the hoist 1 will be described. First, while gripping the handle portion 55 and pushing it down, with the clamping unit 2 separated from the ground G, the user moves the hoist 1 to the position of the side groove lid A while rolling a plurality of casters 61. Then, the handle portion 55 is lifted so that the clamping members 40a, 40b (wall portions 42) face different lid side surfaces A1 respectively. By lifting the handle portion 55, a prepared state is reached where the lower surfaces of the bottom plate portions 32 of the respective rotating plate members 30a, 30b are placed on the upper surface A2 of the lid. From this prepared state, by pushing down the handle portion 55, the periphery of the rotation axis J2 is lifted via the frame 50, and due to the self-weight of the clamping members 40a, 40b, the rotating plate members 30a, 30b change from the overlapping state to the intersecting state, and a clamping state is reached where the clamping members 40a, 40b are pressed against the respective lid side surfaces A1. Further, by pushing down the handle portion 55, the side groove lid A is lifted in the clamped state. In this state, the user moves the hoist 1 together with the side groove lid A to a desired position while rolling a plurality of casters 61.

[0027] When the user reaches the desired position for the gutter cover A, the user lifts the handle 55 to return to the ready state, as shown in FIG. 2. From this ready state, the user pulls the handle 55 toward the user. This applies an external force F1 (see FIG. 3) toward the user to the top wall 11 of the tilting and rotating support structure 10. Accordingly, as shown by the dashed-dotted line in FIG. 5(B), the clamping unit 2 rotates around the rotation axis J1 toward the user, entering a tilted state. During this rotation, the clamping unit 2 receives a force from the lid top surface A2, with which the end P1 of the bottom plate 32 of the rotating plate member 30b is in contact. In this tilted state, most of the clamping members 40a, 40b (e.g., more than 80% of the entire inner surface of the wall 42) are separated upward from the lid side surface A1, entering a non-clamping state. The tilt angle of the clamping unit 2 at this time is 35 to 45 degrees relative to the clamping unit 2 in the ready state. Furthermore, in this fallen state, the user can pull the handle portion 55 toward themselves, causing the end portion P1 of the bottom plate portion 32 to slide on the lid upper surface A2, which causes the clamping members 40a, 40b to separate from the gutter lid A, releasing the clamped state. This concludes the explanation of how to use the lifting machine 1.

[0028] In a comparative example, if the shaft height H1 is higher than the double height Hd obtained by doubling the height H2 of the rotating plate relative to the lid top surface A2, even if the user pulls the handle portion 55 toward the user from this preparation state, the angle of tipping of the clamping unit is small, and accordingly, the amount of rotational movement of each clamping member is small, making it difficult for each clamping member to come off the lid side surface A1. In this regard, in the present embodiment, by making the shaft height H1 lower than the double height Hd obtained by doubling the height H2 of the rotating plate relative to the lid top surface A2, the amount of rotational movement of each clamping member 40a, 40b can be increased even if the user pulls the handle portion 55 toward the user's side only a small amount, and therefore the angle of tipping of the clamping unit 2 can be increased.

[0029] (effect) According to the embodiment described above, the following effects are achieved. The lifting machine 1 lifts a gutter cover A, which is an example of an object to be lifted, in a clamping state by pressing against each of the lid side surfaces A1, which are both opposing side surfaces of the gutter cover A. The lifting machine 1 includes a rod-shaped frame 50, a handle portion 55 provided at the upper end of the frame 50 and grasped by a user, a caster unit 60 having casters 61 that roll on the ground G, attached to the frame 50 and supporting the frame 50 from below, and a clamping unit 2 connected to the lower end of the frame 50 so as to cross the frame 50 and configured to be able to clamp the gutter cover A. The clamping unit 2 extends in the X direction, which is an example of a longitudinal direction of the clamping unit 2 perpendicular to the frame 50, and includes a pair of rotating plate members 30a, 30b that overlap when viewed from the Y direction, which is an example of a depth direction perpendicular to the X direction; a pair of clamping members 40a, 40b that are fixed to the outer sides of the pair of rotating plate members 30a, 30b in the X direction and press against the cover side surfaces A1 in a clamped state; and a pair of clamping members 40a, 40b that are located in the center of the pair of rotating plate members 30a, 30b in the X direction and rotate the pair of rotating plate members 30a, 30b around a rotation axis J2 that is an example of a first rotation axis extending in the Y direction. The clamping and rotating support structure 20 rotatably supports the pair of clamping members 40a, 40b together, and rotatably supports the pair of rotating plate members 30a, 30b between an overlapping state in which the pair of rotating plate members 30a, 30b are overlapped as viewed from the Y direction, and an X-shaped crossed state as viewed from the Y direction; and a tumble and rotating support structure 10 that is located above the clamping and rotating support structure 20 in the clamping state and rotatably supports the clamping and rotating support structure 20 together with the pair of rotating plate members 30a, 30b and the pair of clamping members 40a, 40b around a rotation axis J1, which is an example of a second rotation axis extending in the X direction. In a ready state in which the lower surfaces of the pair of rotating plate members 30a, 30b are placed on a lid upper surface A2, which is an example of the upper surface of a gutter lid A, an axis height H1, which is the height of the rotation axis J1 relative to the lid upper surface A2, is set to be lower than twice the rotating plate height H2, which is the height of the pair of rotating plate members 30a, 30b relative to the lid upper surface A2 in the ready state. In the ready state, when an external force F1 in the Y direction is applied to the tumble and turn support structure 10 from the handle portion 55, the pair of clamping members 40a, 40b are configured so that the clamping unit 2 rotates about the rotation axis J1 so as to fall over on the lid upper surface A2, thereby moving away from the lid side surface A1. With this configuration, the user can move the clamping unit 2 from the ready state to a tipped-over state on the lid upper surface A2 by operating the handle portion 55, thereby separating the clamping members 40a, 40b from the lid side surface A1. Thus, the clamping members 40a, 40b can be easily removed from the gutter lid A. In the past, when the handle portion was pressed down to remove the clamping members from the gutter cover A from the ready state, there was a risk of the clamping state being unintentionally established. In this regard, with the above-described configuration, by changing from the ready state to the overturned state, the clamping state is unlikely to be established again, and the clamping members 40a, 40b can be easily removed from the gutter cover A.

[0030] The present invention is not limited to the above-described embodiments and drawings. Modifications (including the elimination of components) may be made as appropriate within the scope of the present invention. An example of a modification is described below.

[0031] (Variation) In the above embodiment, the lifting machine 1 is configured to be able to lift the side drain cover A, but the object to be lifted may be other than the side drain cover A, such as grating. In the above embodiment, the clamping unit 2 was rotatable about the two rotation axes J1 and J2, but it may also be rotatable about a new rotation axis. This new rotation axis may extend above the rotation axis J1 in a direction perpendicular to the rotation axis J1. This new rotation axis allows the frame 50 to be positioned along the longitudinal direction of the clamping unit 2. In this case, the user can turn the handle 55 left and right from the ready state to lay the clamping unit 2 on its side, thereby setting it in a tilted state. In the above embodiment, the reinforcing member 58 can be omitted. In the above embodiment, the frame 50 may be made up of a plurality of cylindrical members with different cross-sectional sizes connected together so as to be extendable in the Y direction. In the above embodiment, the frame 50 may extend straight. [Explanation of symbols]

[0032] 1...lifting machine, 2...clamping unit, 10...tipping and rotating support structure, 11...side wall portion, 12...ceiling wall portion, 20...clamping and rotating support structure, 21...upper portion, 22...clamping wall portion, 30a, 30b...rotating plate material, 31...main body plate portion, 32...bottom plate portion, 35...regulating portion, 40a, 40b...clamping member, 50...frame, 51...first frame portion, 52...second frame portion, 55...handle portion, 58...reinforcing material, 60...caster unit, 61...caster, 62...base portion, 63...pipe fixing portion, A...side gutter cover, A1...side surface of cover, A2...top surface of cover, B1, B4...bolt, B2, B3...rotating support shaft, G...ground, J1, J2...rotating shaft, P1...end portion, St...stopper

Claims

[Claim 1] A lifting machine that lifts an object to be lifted in a clamped state in which the object to be lifted is clamped by pressing the clamps against both opposing sides of the object to be lifted, A rod-shaped frame; a handle portion provided at an upper end of the frame and gripped by a user; a caster unit having casters that roll on the ground, attached to the frame, and supporting the frame from below; a clamping unit connected to a lower end of the frame so as to cross the frame and configured to be able to clamp the object to be lifted, The clamping unit includes: a pair of rotating plates extending in a longitudinal direction of the clamping unit and overlapping each other when viewed from a depth direction perpendicular to the longitudinal direction; a pair of clamping members fixed to the longitudinal outer sides of the pair of rotating plate members and pressing against the both side surfaces in the clamping state; a clamping and rotational support structure that is located at the center of the pair of rotating plate members in the longitudinal direction and that rotatably supports the pair of rotating plate members together with the pair of clamping members around a first rotation axis that extends in the depth direction, and that rotatably supports the pair of rotating plate members between an overlapping state in which the pair of rotating plate members are overlapped as viewed from the depth direction, and an X-shaped crossing state as viewed from the depth direction; a tumble and turn support structure that is located above the clamping and turning support structure in the clamping state and that rotatably supports the clamping and turning support structure together with the pair of turning plate members and the pair of clamping members around a second turning axis that extends in the longitudinal direction of the clamping unit, In a preparatory state in which the lower surfaces of the pair of rotating plate members are placed on the upper surface of the object to be lifted, a height of the second rotating shaft based on the upper surface is set to be lower than twice the height of the pair of rotating plate members based on the upper surface in the preparatory state, When an external force in the depth direction is applied to the tipping and turning support structure from the handle portion via the frame in the ready state, the pair of clamping members rotate about the second rotation axis so as to fall on the top surface, thereby moving away from the both side surfaces. Lifting machine.

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