JP4581396B2 - Dolly with lifting function - Google Patents

Description

  The present invention relates to a carriage with a lifting function used in a production line of an automobile or the like.

  As an example of an engine assembly line, which is a conventional production line for automobiles, etc., an automobile body conveyor that constitutes a conveyor line of an automobile body and an engine assembly that constitutes a conveyor line of an engine assembly assembled in a sub-assembly line A line overlapping area is formed in which a part of the area overlaps with the conveyor in the vertical direction, a floor conveyor is extended in the line overlapping area to form an engine assembly line, and the lifting device is connected to the floor conveyor of the engine assembly line. The engine assembly is transferred from the conveyor assembly conveyor to the work table of the lifting device, and the lift assembly is operated to lift the engine assembly on the work table. There is one that attaches a solid body to the automobile body suspended on the trolley of the automobile body conveyor (example If, see Patent Document 1.). Here, the elevating device is configured to elevate and lower the work table supported by a guide composed of a slide shaft and a hollow spacer so as to be directly moved up and down by a pneumatic cylinder as an elevating drive device. Moreover, the said raising / lowering apparatus is being fixed to the said floor conveyor (refer patent document 1).

  In addition, as a cart with a lifting function used for lifting and assembling the engine assembly on the automobile body suspended from the trolley of the automobile body conveyor, the pantograph link mechanism can be used in parallel with the carriage base. There is one that lifts and lowers a work table supported so as to be movable up and down by driving the pantograph link mechanism with a hydraulic cylinder that is a lifting drive (for example, see Patent Document 2).

Japanese Examined Patent Publication No. 64-2552 (Fig. 1-3) Japanese Patent Publication No.7-115310 (Fig. 1-2)

  The engine assembly line and the sub-assembly line in Patent Document 1 are different lines, and the work table on which the object to be conveyed is placed is different, so the engine assembly that is the object to be conveyed needs to be replaced. There was a problem. In addition, there is a problem in that a pneumatic cylinder, which is the lifting drive device, is built in a lifting device that moves the work table directly up and down, and as many lifting drive devices as the number of the lifting devices are required. Also, in the cart with the lifting function of Patent Document 2, because the pantograph link mechanism is driven by the hydraulic cylinder that is the lifting drive device, the lifting drive devices for the number of the carts with the lifting function are necessary. There was a problem.

  The present invention has been made in order to solve the above-described problems, and a line (a process in which the height of the object to be conveyed is high) that needs to lift the object to be conveyed, such as an engine assembly line, and an engine. An object of the present invention is to provide a carriage with a lifting function capable of making the same line as a line (a process in which the height of the object to be conveyed is low), such as a sub-assembly line in which an operator assembles an assembly, which does not need to lift the object to be conveyed. And It is another object of the present invention to provide a lift-equipped cart that eliminates the need for lift drive devices for the number of lift devices that change the height of the conveyed object.

  In order to solve the above-mentioned problem, the carriage with a lifting function according to the present invention is a carriage with a lifting function that travels on a predetermined track in which the height of the transport base on which the object is placed is variable from a low position to a high position. The transport table supporting means for supporting the transport table so as to be able to move up and down in parallel with the base of the cart, the upper end supporting the lower surface of the transport table from below, and the direction orthogonal to the traveling direction of the cart And a lower end mounted with rolling elements that rotate about a horizontal axis, and a lower bar protruding downward from the base, and a lower part of the upper and lower bars at the lower position of the transfer table A joint that connects the upper and lower parts of the lifting bar so that the lifting bar can be bent forward or backward in the direction, and a lifting bar support means that supports the lifting bar so that it can be moved up and down linearly. On the cam rail By moving along the rolling elements, the transport platform supported by the lifting rod is raised and lowered according to the height of the cam rail, and when the lifting operation is not performed, the lower portion of the lifting rod is moved around the joint. It is formed by bending it.

  Here, it is preferable that the transport table support means also serves as the lift bar support means by fixing and integrating the lower surface of the transport table and the upper end of the lift bar.

  In addition, the cart with a lifting function according to the present invention is a lifting function for traveling on a predetermined track in which the height of the transport table on which the object is placed is variable from a low position to a high position in order to solve the problem. A carriage with supporting carriage supporting the carriage so as to be movable up and down in parallel with the carriage base; and rolling elements that rotate about a horizontal axis perpendicular to the traveling direction of the carriage. The lifting rod is attached to the lower end and protrudes downward from the base and the support rod attached to the lower portion of the transport table at the lower position of the transport table. A joint for connecting the support member and the lifting rod so as to be able to rotate forward or backward in the traveling direction of the vehicle, and the rolling element of the lifting rod is placed along a cam rail provided on the lower side of the base. The height of the cam rail Depending performed lifting of the transport platform supported by the lift rod, the case of not performing the lifting operation is made as a substantially horizontal by rotating the lift rod around the joint.

  Here, the carrier support means comprises an X-shaped symmetric link formed by pin-supporting a midpoint between the upper and lower ends of two links having the same length, or a combination of a plurality of the X-shaped symmetric links. A telescopic mechanism, wherein one of the upper ends of the telescopic mechanism is pivotally connected to the transport table around a horizontal axis orthogonal to the traveling direction, and the lower end directly below the upper end of the telescopic mechanism is the traveling The base is pivotably connected around a horizontal axis perpendicular to the direction, and the other upper end of the telescopic mechanism is pivotally connected to the transport table around a horizontal axis perpendicular to the travel direction and the horizontal. The shaft is slidably supported in the front-rear direction, and the other lower end directly below the upper end of the expansion / contraction mechanism is connected to the base so as to be rotatable around a horizontal axis perpendicular to the traveling direction, and the horizontal shaft is connected to the front-rear direction. Slidably supported Preferred.

  Also, straight state holding means for holding the straight state of the upper and lower parts of the lifting rod, and bent state holding means for holding the bent state of the upper and lower parts of the lifting bar by bending the lower part of the lifting bar. And preferred.

  Furthermore, an actuator that switches between holding and releasing the straight state holding means, an actuator that switches holding and releasing the bent state holding means, and an actuator that changes the shape of the lifting rod from a straight state to a bent state Are preferably provided.

  Furthermore, a vertical state holding means for holding the vertical state of the lift bar by disabling rotation of the support member of the transfer table and the lift bar, and rotating the lift bar around the joint to be substantially horizontal It is preferable to provide horizontal state holding means for holding the state described above.

  An actuator for switching the holding and releasing of the vertical state holding means; an actuator for switching the holding and releasing of the horizontal state holding means; and an actuator for changing the form of the lifting rod from the vertical state to the horizontal state Are preferably provided.

  According to the carriage with a lifting function according to the present invention, the carriage with a lifting function that travels on a predetermined track, wherein the height of the transportation platform on which the object is placed is variable from a low position to a high position, A conveying table supporting means for supporting the conveying table so that it can move up and down in parallel with the base of the carriage, an upper end supporting the lower surface of the conveying table from below, and a horizontal axis orthogonal to the traveling direction of the carriage A lower end mounted with a rotating rolling element, and a lower bar projecting downward from the base, and a lower part of the lower bar at the lower position of the transport base is directed forward in the traveling direction of the carriage Alternatively, a cam rail provided on the lower side of the base includes a joint that connects the upper and lower portions of the lifting rod and a lifting rod support means that supports the lifting rod so that the lifting rod can be moved linearly. Along the rolling element of the lifting bar Thus, the carriage supported by the lifting rod is raised and lowered according to the height of the cam rail, and when the lifting operation is not performed, the lower portion of the lifting rod is bent around the joint. The process in which the height of the object to be conveyed is high and the process in which the height of the object to be conveyed is low can be made the same line. In addition, since the change of the height of the object to be conveyed is performed according to the height of the cam rail by bringing the rolling element of the lifting rod along the cam rail, the lifting device for changing the height of the object to be conveyed The number of lifting drive units is not required. Further, when the lifting / lowering operation is not performed, the lifting / lowering rod can be bent, so that the depth of the pits in the process where the height of the object to be transported is low can be greatly reduced.

  Further, according to the carriage with a lifting function according to the present invention, the transport base support means also serves as the lift bar support means by fixing and integrating the lower surface of the transport base and the upper end of the lift bar. Therefore, since it is not necessary to provide the lifting bar support means, the mechanism can be simplified, the reliability can be improved, and the cost can be reduced.

  Furthermore, according to the cart with the lifting function according to the present invention, the cart with the lifting function that travels on a predetermined track, the height of the transport table on which the object is placed can be varied from a low position to a high position. A transfer table support means for supporting the transfer table so that it can move up and down in parallel with the base of the carriage, and a rolling element that rotates about a horizontal axis orthogonal to the traveling direction of the carriage, The lift bar is directed toward the traveling direction of the carriage with respect to the lift bar protruding downward from the base and the support member attached to the lower part of the transfer stage at the lower position of the transfer stage. A joint connecting the support member and the lifting rod so as to be able to rotate forward or backward, and by rolling the rolling element of the lifting rod along a cam rail provided on the lower side of the base, Depending on the height of the cam rail, When the transport platform supported by the bar is lifted and the lifting operation is not performed, the lift bar is rotated around the joint to be substantially horizontal, so that the height of the object to be transported is high And the step where the height of the conveyed object is low can be made the same line. In addition, since the change of the height of the object to be conveyed is performed according to the height of the cam rail by bringing the rolling element of the lifting rod along the cam rail, the lifting device for changing the height of the object to be conveyed The number of lifting drive units is not required. Further, when the lifting / lowering operation is not performed, the lifting / lowering rod can be rotated to be substantially horizontal, so that the depth of the pit in the process in which the height of the transported object is low can be greatly reduced. it can. Furthermore, since it is not necessary to provide the lifting rod support means, the mechanism can be simplified, the reliability can be improved, and the cost can be reduced.

  Still further, according to the carriage with a lifting function according to the present invention, the conveyance base support means pin-supports a midpoint between the upper and lower ends of two links having the same length, A telescopic mechanism composed of a combination of a plurality of X-shaped symmetric links, wherein one of the upper ends of the telescopic mechanism is rotatably connected to the transport table around a horizontal axis orthogonal to the traveling direction, and the telescopic mechanism The lower end of one of the upper ends is connected to the base so as to be rotatable about a horizontal axis orthogonal to the traveling direction, and the other upper end of the telescopic mechanism is rotated about the horizontal axis orthogonal to the traveling direction. The horizontal axis is slidably supported in the front-rear direction while being connected to the carriage so that the horizontal axis can slide in the front-rear direction, and the lower end directly below the other upper end of the telescopic mechanism is rotated around the horizontal axis perpendicular to the traveling direction. Movably connected and the water Since then slidably supported in the longitudinal direction axis, while ensuring a sufficient lifting stroke, it is possible to reduce the vertical space of the transport stand supporting means, it is possible to improve workability.

  Further, according to the carriage with a lifting function according to the present invention, the straight state holding means for holding the straight state of the upper and lower parts of the lifting bar, and the upper and lower parts of the lifting bar bent at the lower part of the lifting bar. Since the bent state holding means for holding the bent state is provided, the lifting and lowering operation of the transport table and the traveling operation of the carriage can be performed more stably.

  Further, according to the carriage with a lifting function according to the present invention, an actuator for switching the holding and release of the straight state holding means, an actuator for switching the holding and releasing of the bent state holding means, Since the actuator for changing the form from the straight state to the bent state is provided, it is possible to realize automation such as the elevating operation and the elevating operation of the elevating rod in the process where the height of the conveyed object is low.

  Furthermore, according to the cart with the lifting function according to the present invention, the vertical state holding means for holding the vertical state of the lifting rod by disabling the support member of the transfer table and the lifting rod, and the lifting Since there is provided a horizontal state holding means for rotating the rod around the joint to maintain a substantially horizontal state, the lifting and lowering operations of the transport table and the traveling operation of the carriage can be performed more stably.

  Further, according to the carriage with a lifting function according to the present invention, an actuator for switching the holding and releasing of the vertical state holding means, an actuator for switching the holding and releasing of the horizontal state holding means, and the lifting rod Since it includes an actuator that changes the shape from a vertical state to a horizontal state, it is possible to realize automation such as the lifting and lowering operation and the rotating operation of the lifting and lowering bar in a process in which the height of the conveyed object is low. .

  Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments shown in the accompanying drawings, and includes all the embodiments that satisfy the requirements described in the claims. It is a waste. Since the cart of the present invention is transported by a general travel drive device such as a chain conveyor or a friction conveyor, the description of the travel drive device is omitted in the following description. In the following, the traveling direction side of the carriage along the predetermined track is defined as the front, the opposite side is defined as the rear, the left side toward the front is left, and the right side toward the front is right.

  1 and 2 are explanatory views showing the configuration of a cart with a lifting function according to an embodiment of the present invention, FIG. 1 is a left side partial cross-sectional view, and FIG. 2 is a back partial cross-sectional view (viewed from the back). ). The carriage 1 with the lifting function is driven by a travel drive device (not shown) and travels by rolling the wheels 3, 3... Attached to the lower surface of the base 2 on the travel rails R, R (travel direction). A). Although the conveyed object W is not shown in FIG. 1, the conveyed object W can be placed directly on the conveying table 4, or a work table fixed on the conveying table 4 as shown in FIG. Alternatively, it can be placed on the transport table 4 via the pallet B or the like. Further, the transport table 4 is supported by the links 6 and 7 constituting the expansion / contraction mechanism 5 serving as a transport table support means so as to be able to move up and down in parallel with the base 2 (see C in FIG. 1). ). Further, the transport table 4 is supported by a support frame 18 that is a support member attached to the lower part thereof.

  The links 6 and 7 have the same length, are pin-supported at the middle point 8 between the upper and lower ends 6a and 6b and between the upper and lower ends 6a and 6b, and are configured to be relatively rotatable around the middle point 8. It is a symmetrical link. The X-shaped symmetric link expands and contracts vertically when the distance between the upper ends 6a and 7a (the distance between the lower ends 7b and 6b) is changed, so that the expansion / contraction mechanism 5 can be configured. An upper end 6 a of the link 6 is rotatably connected to the transport table 4 around a horizontal axis orthogonal to the traveling direction A, and is supported by the slide guide 9 so as to be slidable in the front-rear direction. A lower end 7b of the link 7 directly below the upper end 6a of the link 6 is rotatably connected to the base 2 around a horizontal axis orthogonal to the traveling direction A, and the horizontal axis is moved in the front-rear direction by the slide guide 10. Is slidably supported. The upper end 7a of the link 7 is rotatably connected to the transport table 4 around a horizontal axis orthogonal to the traveling direction A, and the lower end 6b of the link 6 directly below the upper end 7a of the link 7 is connected to the traveling direction A. It is connected to the base 2 so as to be rotatable around an orthogonal horizontal axis.

  Since the carrier support means is constituted by the expansion / contraction mechanism 5 composed of the X-shaped symmetric link as described above, the carrier 4 can be moved up and down in parallel with the base 2 and sufficiently lifted and lowered. While ensuring the stroke (see S in FIG. 1), the space in the vertical direction of the carrier support means can be kept small (see FIGS. 1 and 2). Further, as the expansion / contraction mechanism 5, a combination of a plurality of the X-shaped symmetric links can be used. Further, as the carriage support means, a linear guide composed of rolling guides or sliding guides such as linear bearings and roller guides can be used. In addition, the front, back, left and right side surfaces are covered with a bellows-like cover 19 from the transport table 4 to the base 2 for the purpose of protecting workers from the transport table support means and dust-proofing the transport table support means.

  In the present invention, the lifting / lowering rod 11 lifts and lowers the transport table 4 supported by the transport table support means. The lifting / lowering bar 11 includes an upper part 12 and a lower part 13, and the upper part 12 and the lower part 13 of the lifting / lowering bar 11 are connected by a joint 14 so that the lower part 13 can be bent forward in the traveling direction A. Further, the lifting / lowering rod 11 supports the lower surface 4a of the transport table 4 from below by its upper end, and a rolling element 15 that rotates about a horizontal axis orthogonal to the traveling direction A is attached to its lower end. Protrudes downward from the top. As a lifting / lowering rod support means for supporting the lifting / lowering rod 11 so as to be movable up and down linearly, for example, a linear guide can be provided on the base 2. Moreover, if the lower surface 4a of the conveyance base 4 and the upper end of the raising / lowering stick | rod 11 are fixed and integrated, it can also serve as the said raising / lowering stick | rod support means by the said conveyance stand support means. Therefore, it is not necessary to provide the elevating rod support means, so that the mechanism can be simplified, the reliability can be improved, and the cost can be reduced.

  In the straight state of the upper portion 12 and the lower portion 13 of the elevating rod 11 as shown in FIG. 1, the elevating rod 11 is set in accordance with the height of the cam rail CR by placing the rolling element 15 attached to the lower end of the elevating rod 11 on the cam rail CR. The carriage 4 supported by the elevator moves up and down. Therefore, the height of the conveyance table 4 can be varied from the low position L to the high position H by setting the height of the cam rail CR. By setting the height of the cam rail CR so as to correspond to the height required for the work process, the height of the transport table 4 can be easily set to the height required for the work process.

  Further, the lower part of the lifting / lowering rod 11 and the roller 17 that engages the concave part of the side surface of the I-shaped steel forming the cam rail CR are connected by the arm 16 and sandwich the cam rail CR from above and below. The running of the rolling elements 15 along can be performed more stably. However, a configuration without the arm 16 and the roller 17 may be employed.

  With the configuration as described above, the carriage with a lifting function of the present invention can be easily applied to, for example, an operation of assembling an automobile engine assembly to an automobile body suspended from a trolley of an automobile body transport conveyor.

  FIG. 3 is an explanatory diagram of the bending operation of the lifting bar. In the state where the height of the transport table 4 is at the low position L, when the lifting operation of the transport table 4 is not performed, the lower portion 13 of the lift bar 11 is bent forward in the traveling direction A around the joint 14 and bent. (Substantially horizontal state) (see D in FIG. 3). When this operation is performed, it is necessary to release the straight state holding means 20 that holds the straight state of the upper portion 12 and the lower portion 13 of the lifting rod 11 described later. The bent state can be held by a bent state holding means 24 described later. In the case where the arm 16 and the roller 17 are provided in the lower portion 13 of the lifting / lowering rod 11, when the lifting / lowering rod is bent, the cam rail is disengaged from the side recess of the cam rail CR. It is necessary to form the notch in the CR or perform the operation at a place where the cam rail CR is eliminated.

  As described above, if the lifting / lowering rod 11 is bent to be in the bent state, the protrusion of the lifting / lowering rod 11 into the pit P can be reduced. As shown in FIG. 4, the depth of the pit P can be reduced. For example, it is possible to reduce the depth of the pit P in a sub-assembly line or the like that performs an assembly operation of the engine assembly.

  FIG. 5 is an explanatory view showing an example of a straight state holding means for holding the straight state of the upper and lower portions of the lifting bar, FIG. 5 (a) is a left side view, and FIG. 5 (b) is a rear sectional view. . The engagement pieces 21 and 21 of the straight state holding means 20 are supported on the upper portion 12 of the elevating rod 11 so as to be rotatable in the left and right directions by pins 22 and 22 having axial centers in the front and rear direction. Further, the engagement pieces 21 and 21 are elastically biased by the coil spring 23 and are engaged with the engagement recesses 13 a and 13 a of the lower portion 13 of the elevating rod 11. Therefore, the straight state of the upper part 12 and the lower part 13 of the elevating rod 11 is maintained. In this state, when the engagement between the engagement pieces 21 and 21 and the engagement recesses 13a and 13a is released (see a two-dot chain line in FIG. 5B), the lower portion 13 of the elevating rod 11 is moved by the joint 14. It becomes possible to bend forward with respect to the upper part 12 of the elevating bar 11. Such switching between holding and releasing of the straight state holding means can be performed manually by an operator or by an actuator such as a solenoid or a small pneumatic cylinder. From the viewpoint of automation, the actuator is used. Is preferred.

  FIG. 6 is an explanatory view showing an example of a bent state holding means for holding the bent state of the upper and lower portions of the lifting rod, FIG. 6 (a) is a left side view, and FIG. 6 (b) is a front sectional view (front). Figure seen from). The engagement pieces 25, 25 of the bent state holding means 24 are provided in the bent state (substantially horizontal state) so that the lifting rod 11 in the vicinity of the rolling element 15 can be rotated in the left-right direction by pins 26, 26 having axial centers in the front-rear direction. Is supported by a lower portion 13. Further, the engagement pieces 25, 25 are elastically biased by the coil springs 27, 27 and are engaged with the engagement recesses 18 a, 18 a of the support frame 18. Therefore, the bent state of the upper part 12 and the lower part 13 of the elevating rod 11 is maintained. In this state, when the engagement between the engagement pieces 25 and 25 and the engagement recesses 18a and 18a is released (see the two-dot chain line in FIG. 6B), the holding of the bent state is released. Such switching between holding and releasing of the bent state holding means can be performed manually by an operator or by an actuator such as a solenoid or a small pneumatic cylinder, but from the viewpoint of automation, the actuator is used. Is preferred.

  Further, after releasing the straight state holding means 20 in the straight state of the lifting / lowering rod 11, the shape change of the lifting / lowering rod 11 to the bent state can be performed by an operator's operation or by an actuator. From the viewpoint of automation, it is preferable to use the actuator. As the actuator, an electric motor or a pneumatic motor incorporated in the joint 14 or a pneumatic cylinder or a hydraulic cylinder provided between the support frame 18 and the lower portion 13 of the lifting rod 11 can be used. Further, the shape change from the bent state to the straight state can be performed by an operator's operation, by the own weight of the lower portion 13 of the lifting / lowering rod 11, or by the actuator. When the actuator is used, only the lower portion 13 of the lifting rod 11 is driven by the actuator and the load is small, so that the output (capacity) of the actuator can be kept small. For example, as disclosed in Patent Documents 1 and 2, an actuator having a significantly smaller output (capacity) can be used as compared with an actuator that drives the lifting device to raise and lower the transport table (work table) together with the object to be transported W. .

  FIG. 7 is an explanatory view showing another example of the straight state holding means and the bent state holding means of the lifting bar, and FIG. 7A is a state in which the straightness of the lifting bar is held by the straight state holding means. 7 (b) shows a state in which the straight holding of the lifting bar by the straight state holding means is released, and FIG. 7 (c) shows a state in which the bending of the lifting bar is held by the bending state holding means. In the figure, the same reference numerals as those in FIGS. 1, 5, and 6 denote the same or corresponding parts. The lower part 13 of the lifting / lowering rod 11 includes a cylindrical body 13b and a rod-like body 13c, and the rod-like body 13c is slidably supported by a hole 13d of the cylindrical body 13b. The cylindrical body 13b has upper and lower elongated holes 13e formed in the straight state of the elevating rod 11, and the rod-shaped body 13c is attached to the rod-shaped body 13c by attaching a pin 13f that engages with the elongated hole 13e. It is comprised so that it may not fall out from the cylindrical body 13b. A fitting recess 12 a is formed in the lower part of the upper part 12 of the lifting rod 11.

  As shown in FIG. 7A, in the state where the upper portion of the rod-like body 13c is fitted in the fitting recess 12a, the straight state of the elevating rod 11 is held. Can be configured. Further, in the state of FIG. 7A, the rod-like body 13c can be lowered by sliding the cylindrical body 13b by partially eliminating the cam rail CR or lowering the cam rail CR (FIG. 7). (See E in (b).) Therefore, as shown in FIG. 7B, since the upper portion of the rod-like body 13c and the fitting recess 12a are disengaged, it is possible to release the holding of the elevating rod 11 in the straight state. In this state, the lower portion 13 of the lifting / lowering rod 11 can be bent around the joint 14 (see D in FIG. 7B). After the lower portion 13 of the lifting rod 11 is bent around the joint 14, the rod-like body 13c is slid rearward (see F in FIG. 7C). As shown in FIG. The lower bar 12b of the upper part 12 and the rod-shaped body 13c can maintain the bent state of the lifting bar. Therefore, the bent state holding means 24 for holding the bent state of the upper part 12 and the lower part 13 of the lifting / lowering rod 11 can be configured by such a configuration.

  As described above, according to the carriage 1 with the lifting function of the present invention, the line (the process in which the height of the transported object W is high) and the engine assembly that are required to lift the transported object W, such as the engine assembly line, are provided. A line that does not require the operator to lift the object to be transported W to be assembled (such as a process in which the height of the object to be transported W is low) like the sub-assembly line to be assembled can be made the same line. Moreover, since the change of the height of the said to-be-conveyed object W can be performed according to the height of the said cam rail CR by putting the rolling element 15 of the raising / lowering rod 11 along the cam rail CR, the height of the said to-be-conveyed object W is changed. Elevating drive devices for the number of lifting devices that change the height are not necessary. Further, when the lifting / lowering operation is not performed, the lifting / lowering rod 11 can be bent, so that the depth of the pits P in the process where the height of the conveyed object W is low can be significantly reduced.

  In the above description, the lifting / lowering rod 11 is composed of the upper portion 12 and the lower portion 13, and the upper portion 12 and the lower portion 13 are connected to each other by the joint 14 so as to be foldable, and are conveyed by the upper end of the lifting / lowering rod 11. Although the structure which supports the lower surface 4a of the base 4 from the downward direction was shown, this invention is not limited to such a structure. For example, a joint (hereinafter referred to as “J”) that connects a support frame 18 that is a support member of the transport table 4 and a lifting rod (hereinafter referred to as “G”) is provided. In the low position L, the lifting rod G may be configured to be rotatable forward or backward in the traveling direction A with respect to the support frame 18. Even in such a configuration, instead of the straight state holding means 20, the rotation of the support frame 18 of the transport table 4 and the lifting rod G, which is the same configuration as the straight state holding means 20, is made impossible. A vertical state holding means for holding the vertical state of the lifting rod G can be provided. Further, instead of the bent state holding means 24, the support frame 18 has a substantially horizontal state in which the lifting rod G is rotated around the joint J and has the same configuration as the bent state holding means 24. It is possible to provide a horizontal state holding means for holding between. Further, an actuator for switching between holding and releasing of the vertical state holding means, which is similar in configuration to an actuator for switching between holding and releasing of the straight state holding means 20, and switching between holding and releasing of the bent state holding means 24 The actuator has the same configuration as the actuator that performs the switching of holding and release of the horizontal state holding means, and the actuator that changes the form of the lifting rod 11 from the straight state to the bent state. An actuator for changing the shape of the lifting rod G from the vertical state to the horizontal state can be provided.

It is a left side fragmentary sectional view showing composition of a trolley with a raising / lowering function concerning an embodiment of the invention. It is a back surface fragmentary sectional view which shows the structure of the trolley | bogie with a raising / lowering function which concerns on embodiment of this invention. It is explanatory drawing of bending operation | movement of a raising / lowering rod. It is explanatory drawing which shows the case where a raising / lowering rod is bent and it is set as the bending state and the depth of a pit is formed shallowly. It is explanatory drawing which shows the example of the straight state holding means which hold | maintains the straight state of the upper part and lower part of a raising / lowering rod, (a) is a left view, (b) is a rear sectional view. It is explanatory drawing which shows the example of the bending state holding means which hold | maintains the bending state of the upper part and lower part of a raising / lowering rod, (a) is a left view, (b) is front sectional drawing. It is explanatory drawing which shows the example of the straight state holding | maintenance means of a raising / lowering bar, and a bending state holding means, (a) is the state which is holding the straightness of a raising / lowering bar by the straight state holding means, (b) is by a straight state holding means. A state in which the straight holding of the lifting bar is released, (c) shows a state in which the bending of the lifting bar is held by the bent state holding means.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Carriage with raising / lowering function 2 Base 4 Carriage 3 Wheel 5 Telescopic mechanism 6, 7 Link 6a, 7a Upper end 6b, 7b Lower end 8 Middle point 9,10 of link 6,7 which comprises X-shaped symmetrical link Lifting rod 12 Upper part 12a Fitting recess 12b Lower surface 13 Lower part 13a Engaging recess 13b Cylindrical body 13c Rod-like body 13d Hole 13e Long hole 13f Pin 14 Joint 15 Rolling body 18 Support frame 20 Straight state holding means 24 Bending state holding means CR Cam rail P Pit R Running rail

Claims (8)

A carriage with an elevating function that travels on a predetermined trajectory, wherein the height of the transport platform on which the object is placed is variable from a low position to a high position,
Transport table support means for supporting the transport table so that it can move up and down in parallel with the base of the carriage;
A lifting rod that has an upper end that supports the lower surface of the carrier from below and a lower end that is mounted with rolling elements that rotate about a horizontal axis that is orthogonal to the traveling direction of the carriage, and that protrudes downward from the base; ,
A joint for connecting the upper and lower parts of the lifting bar so that the lower part of the lifting bar can be bent forward or backward in the traveling direction of the carriage at the lower position of the transfer table;
Elevating rod support means for supporting the elevating rod so as to be movable up and down directly,
By moving the lifting rod rolling element along a cam rail provided on the lower side of the base, the carriage supported by the lifting rod is raised and lowered according to the height of the cam rail, and the lifting operation is performed. When there is not, the cart with a raising / lowering function which bends the lower part of the raising / lowering rod around the joint.   The carriage with a lifting / lowering function according to claim 1, wherein the transport base support means also serves as the lift bar support means by fixing and integrating the lower surface of the transport base and the upper end of the lift bar. A carriage with an elevating function that travels on a predetermined trajectory, wherein the height of the transport platform on which the object is placed is variable from a low position to a high position,
Transport table support means for supporting the transport table so that it can move up and down in parallel with the base of the carriage;
A rolling element that rotates around a horizontal axis that is orthogonal to the traveling direction of the carriage is attached to the lower end, and a lifting rod that protrudes downward from the base, and
The support member and the support member are attached to a lower part of the transfer table at a low position of the transfer table so that the elevating bar can be rotated forward or backward in the traveling direction of the carriage. A joint for connecting the lifting bar,
By moving the lifting rod rolling element along a cam rail provided on the lower side of the base, the carriage supported by the lifting rod is raised and lowered according to the height of the cam rail, and the lifting operation is performed. When there is not, the cart with the raising / lowering function which makes the raising / lowering rod rotate around the joint and becomes substantially horizontal.   The transport base support means is a telescopic mechanism comprising an X-shaped symmetric link formed by pin-supporting a midpoint between the upper and lower ends of two links having the same length, or a combination of a plurality of the X-shaped symmetric links. Yes, one of the upper ends of the telescopic mechanism is pivotally connected to the transport table around a horizontal axis perpendicular to the traveling direction, and the lower end directly below the upper end of the telescopic mechanism is orthogonal to the traveling direction. The other end of the telescopic mechanism is pivotally connected to the transport table about a horizontal axis perpendicular to the traveling direction, and the horizontal axis is moved back and forth. Slidably supported in the direction, and the other directly lower end of the telescopic mechanism is pivotably connected to the base around a horizontal axis perpendicular to the traveling direction and the horizontal axis is slidable in the front-rear direction Claim 1 is supported. Lifting function with the truck as claimed in any of the three.   A straight state holding means for holding the straight state of the upper and lower parts of the lifting bar, and a bent state holding means for holding the bent state of the upper and lower parts of the lifting bar by bending the lower part of the lifting bar. Item 5. A cart with a lifting function according to any one of Items 1, 2, and 4.   An actuator for switching between holding and releasing the straight state holding means, an actuator for switching between holding and releasing the bent state holding means, and an actuator for changing the shape of the lifting rod from a straight state to a bent state. The trolley | bogie with a raising / lowering function of Claim 5 provided. A vertical state holding means for holding the vertical state of the lifting bar by disabling rotation of the support member of the transfer table and the lifting bar, and a state in which the lifting bar is rotated around the joint to be substantially horizontal The cart with a raising / lowering function of Claim 3 or 4 provided with the horizontal state holding means to hold | maintain.
An actuator for switching between holding and releasing of the vertical state holding means, an actuator for switching between holding and releasing of the horizontal state holding means, and an actuator for changing the shape of the lifting rod from a vertical state to a horizontal state. The trolley | bogie with a raising / lowering function of Claim 7 provided.

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