JP2006290047A - Raisable wheel device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a raisable wheel device capable of being mounted to an object, realizing a moving condition for making the object movable by lowering a wheel and a stationary condition for making rotation of the wheels disable by raising the wheel, and raising the wheels with a single pedal at a degree of freedom in height from a mountable floor without a problem of loads received under the stationary condition. <P>SOLUTION: This raisable wheel device 1 comprises a support 2 having ground supporting faces 4a, 4b ground-supporting an object non-movably, a raising arm extending to the outside of the support 2 and rotatable around a first axis 10 relative to the support 2, a pedal 21 rotatable around a second axis 20 relative to the raising arm 11, a wheel 8 journalled to the raising arm 11 by a third axis 9, and a pawl part 5 provided on the side face of the support 2, and locking the raising arm 11 under a condition that the wheel 8 is exposed below the ground supporting faces 4a, 4b by engagement with a pedal tip end 22. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a wheel that can move furniture such as a bed, a chair, and a table, and a heavy object such as a cart, office equipment, etc., and in particular, a state in which the wheel can be moved by lowering the wheel, and the wheel is raised. It is related with the raising / lowering wheel apparatus which makes it possible to implement | achieve the stationary state which made it move away from the floor surface and made it impossible to move.

  Conventionally, a bed with a wheel (a caster), a chair, a truck for carrying goods, etc., has been used both when moving by rotating the wheel and when stopping by restricting the rotation of the wheel. ing. For example, in a hospital, a bed with a patient is moved from a treatment room or operating room to a hospital room by wheels, and then used as a bed for medical treatment in a stationary state in the hospital room, or a baggage transports luggage to a destination, This is the case, for example, when unloading work with the cart stationary. Therefore, in order to make the wheel stand still without rotating, a wheel provided with a lock mechanism that brings a braking member into contact with the wheel and restricts the rotation of the wheel by the contact pressure is used.

  Moreover, what makes a trolley | bogie etc. a stationary state by attaching a jack-like apparatus to the bottom face of a bed, a trolley | bogie, etc. which have a wheel, and making this the state which floated the wheel from the floor surface is also implemented. As illustrated in FIG. 5, in the jack-like device 100, a support body that supports an object such as a carriage attached to the attachment base 101 from the floor surface is inscribed in the vertical direction with the cylindrical member 102 a inscribed therein. It is formed by a sliding member 102b that slides and a grounding part 102c that contacts the floor surface. According to this configuration, when the wheel is lifted from the floor, the lowering arm 105b is rotated about the axis 110 in the clockwise direction in the figure by stepping on the lowering pedal 105a. Along with this, the shaft 111 also rotates around the shaft 110, and the lifting arm 106 b connected to the lowering arm 105 b by the shaft 111 extends along the long hole 107 drilled in the cylindrical member 102 a in the vertical direction. While the shaft 112 is lowered, the shaft 112 is rotated counterclockwise around the shaft 112. Thereby, the raising / lowering member 102b connected with the cylindrical member 102a by the axis | shaft 112 descend | falls to a perpendicular direction, and the earthing | grounding part c contacts a floor surface. When the elevating member 102b further descends, the object attached to the mounting base 101 is lifted, and the object is supported by the jack-like device 100 in a state where the wheel is lifted from the floor surface. . At this time, the shaft 110 and the shaft 112 are on the same vertical line V, whereas the shaft 111 is pushed beyond the vertical line V (in the left direction in the figure), so that the supporting state is maintained. . Further, when the wheels can be rotated, when the ascending pedal 106a is depressed, the ascending arm 106b rotates around the axis 112, and the axis 111 also exceeds the vertical line V around the axis 112, and the timepiece shown in the figure. Rotate in the direction. As a result, the above support state is released, and the elevating member 102b is raised by the force of the spring inside the support so that the wheel contacts the floor and the object can be moved by the rotation of the wheel.

  The above-described technique is naturally known to those skilled in the art, and the present applicant does not know a document describing the above-described technique at the time of filing this application.

  However, the wheel having the conventional lock mechanism may be wobbled because it can turn around the vertical axis even if the rotation of the wheel is locked. In addition, even if a lock mechanism that restricts turning around the vertical axis is added, the contact between the wheel and the floor surface is a point contact. It was unstable.

  In addition, the conventional jack-like device has a structure in which the height of the support is generally more than a dozen centimeters in a state where the elevating member is shortest. There is a problem that is limited and can only be used for objects having relatively large wheels. In addition, since the load of the object is applied to the shaft portion (for example, the rotating shafts 110, 111, 112, etc. in FIG. 5) in the toggle structure of the jack-like device in a stationary state, a heavy object such as a bed is left for a long time. In order to remain stationary, it was necessary to have sufficient strength and durability to withstand the load. For this reason, there is a problem that the cost is high in order to make it strong with a member that can obtain high strength. Furthermore, as described above, since a lowering pedal for lowering the support body in the floor direction and a lifting pedal for raising the support are separately required, the structure is complicated and the operation is complicated for the user. There was a problem of being.

  Therefore, in view of the above situation, the present invention is attached to an object such as a bed or a carriage, and a moving state in which the object can be moved by lowering the wheel, and the wheel is moved away from the floor to rotate the wheel. Can be realized with a simple structure, the load received from the object in the stationary state is not a problem, and there is a large degree of freedom in height from the floor surface that can be mounted, and the wheel with a single pedal It is an object of the present invention to provide a lifting and lowering wheel device capable of moving up and down.

  The lifting and lowering wheel device according to the present invention includes: a support having a mounting portion that is attached to an object, and a grounding support surface that grounds and supports the object so that the object cannot move; A lifting arm that extends to the outside of the support and rotates about the first axis; and a second shaft provided in the vicinity of the end of the lifting arm that faces the first axis. And is supported by the lifting arm by a horizontal third shaft, and moves up and down with respect to the grounding support surface as the lifting arm rotates about the first shaft, and with respect to the grounding support surface. In a state where the object is moved by rotation around the third axis, and provided on the side surface of the support body of the support body. The ascending state is lowered with respect to the ground support surface. An engaging state in which the pedal is pivoted around the first axis by a stepping operation and the tip of the pedal is engaged with the claw portion. The main feature is that the engagement state is released by rotating around the second axis up to the engagement angle and turning in the opposite direction to this rotation.

  According to this configuration, the support is in contact with the floor surface by the ground support surface in a state where the ground contact point of the wheel is located above the ground support surface of the support, and supports the object attached to the mounting portion. . Therefore, when the wheel is raised, the load of the object is not locally applied to the shaft or the like, and the weight of the object is supported by the entire structure including the side surface of the support body and the ground support surface.

  Further, since the wheel is attached to the lifting arm by the third shaft, the wheel is interlocked with the movement of the lifting arm. And since the raising / lowering arm is pivotally supported with respect to a support body by the 1st axis | shaft, the height of the arbitrary points in an raising / lowering arm changes with rotation around a 1st axis | shaft. Therefore, it is possible to move the wheel up and down with respect to the ground support surface of the support by rotating the lifting arm around the first axis, and by pushing down the lift arm toward the floor, the wheel It can be exposed below the ground support surface. In addition, a load is applied to the lifting arm by setting the mounting position of the third shaft in the lifting arm to a position where the wheel is not exposed below the ground support surface of the support with the lifting arm in the highest position. In the absence, the wheel is housed in the support.

  Here, the lifting arm may be disposed on the inner side of the support and supported by the first shaft, or may be disposed on the outer side of the support and supported by the first shaft. Good. The position of the first shaft relative to the support can be set by the length of the lifting arm and the height of the support relative to the wheel diameter. For example, if the length of the lifting arm of the part extending from the support is the same, the lever is moved up and down with a small force as the first shaft is provided on the side of the support on the opposite side in the horizontal direction. The arm can be pushed down.

  In addition, as the first shaft is provided closer to the bottom of the support body, the height of the support body can be kept lower than the wheel diameter. Therefore, the height of the support can be set according to the wheel diameter by setting the length of the lifting arm and the position of the first shaft.

  Furthermore, the pedal provided at the end of the lifting arm opposite to the first shaft can rotate the lifting arm around the first shaft, that is, the wheel can be lowered by pressing the lifting arm by a stepping operation. Become.

  At this time, since the pedal is rotatable around the second axis with respect to the lifting arm, the engagement angle at which the tip of the pedal engages with the claw after the pedal is pushed down below the claw of the support. By rotating the pedal to the end, it becomes possible to lock the tip end portion of the pedal by engagement with the claw portion. Then, once the pedal tip and the claw are engaged, a force that presses the pedal tip from above is applied to the claw due to the weight of the object supported by the support. Is held stably. Thereby, the state where the lifting arm is pushed down and the wheel is exposed below the ground support surface of the support body is maintained, and the object can be moved by rotating the wheel.

  In addition, since the pedal can rotate around the second axis in the reverse direction, the engaged state can be released. At this time, a force to push up the claw portion acts on the pedal tip by stepping on the pedal, but the lifting arm first rotates around the first axis because it is pressed by the claw portion due to the weight of the object. Further, the engaged state is released by further rotating the pedal around the second axis. Thereby, it is possible to prevent an excessive force from being applied to the claw portion from the pedal tip portion at the moment when the engaged state is released, and it is possible to suppress wear and loss of the claw portion and the pedal tip portion. As a result of the engagement being released in this manner, no force is applied to the lifting arm, and the grounding support surface of the support comes into contact with the floor surface due to the weight of the object supported by the support. . Accordingly, the lifting arm in a state where no load is applied to the pedal rotates around the first axis to take the highest position, and in this state, the lifting arm is supported by the lifting arm at a position where it is not exposed from the ground support surface. The wheel is accommodated in the support. As a result, the object is grounded and supported by the support so as not to move.

  Therefore, according to this invention, it becomes possible to raise / lower a wheel with respect to the earthing | grounding support surface of a support body by rotating the raising / lowering arm which supported the wheel around the 1st axis | shaft. Further, the pedal can be easily lifted and lowered by a stepping operation using a pedal attached to the lifting arm. As a result, it is possible to easily realize a moving state in which the wheel is moved down and a stationary state in which the wheel is moved up and cannot be moved with respect to the supported object.

  Furthermore, the height of the support can be set according to the diameter of the wheel according to the length of the lifting arm and the position of the first shaft. Thereby, the freedom degree with respect to the height from the floor surface which can be attached becomes large compared with the conventional apparatus. For example, the lifting / lowering wheel device of the present invention is attached to an object having small wheels, and the movement by rotation of the wheels can be performed, and the stationary state can be kept.

  In addition, by making the pedal pivotable about the second axis with respect to the lifting arm, it is possible to hold the state where the wheel is lowered by engaging the tip of the pedal with the claw portion of the support. In addition, the engaged state can be easily released by rotating the pedal in the reverse direction. That is, with a very simple structure, the state in which the wheel is lowered can be maintained and can be released. In addition, since the operation of lowering the wheel and the operation of raising the wheel can be performed by a single pedal, the operation is easy and convenient for the user.

  Further, when the object is supported by grounding by raising the wheel, the weight of the object is supported by the entire structure of the support including the grounding support surface and the side surface. Thus, even when a heavy object such as a bed is left stationary for a long time, a load is not locally applied to the lifting arm, the first shaft, the second shaft, and the like. Accordingly, strength and durability are not required as in conventional devices in which a load is applied to the shaft portion in a stationary state, which is advantageous in terms of manufacturing cost. In addition, since the stationary state is maintained with the wheel raised from the floor surface, the load is concentrated on one point under the wheel to be grounded, as in the case where the rotation of the wheel itself is locked and stationary. The surface is not scratched. In addition, since the stationary state of the object is extremely stable due to the grounding support by the whole structure of the support body, even if the object itself has a wheel in addition to the lifting wheel device of the present invention, the wobble of the wheel As a result, the installation position of the object is shifted by fine movement, so that there is no fear of causing unnecessary scratches on the floor surface.

  In the lifting wheel device according to the present invention, “the lifting arm is formed at the end on the second shaft side with a slope that creates a gap between the rear surface of the pedal in the engaged state. And the engagement state is released by depressing the pedal toward the arm end so as to eliminate the gap. "

  Here, the arm end portion is formed so as to have an inclination such that a gap is formed between the back surface of the pedal and the arm end portion in an engaged state where the pedal tip portion is engaged with the claw portion. For example, the slope of the lift arm can be reduced by decreasing the width of the side surface of the lift arm toward the tip.

  The presence of such a gap facilitates the operation of releasing the engaged state by rotating the pedal in the reverse direction around the second axis from the engaged angle in the engaged state. That is, by stepping on the pedal toward the arm end so as to eliminate this gap, the lifting arm is rotated and pushed down around the first axis, and then the pedal is further rotated around the second axis. The engaged state between the pedal tip and the claw is released. As a result, the engaged state is released without applying an excessive force to the pedal tip and the claw, and it is possible to suppress wear and loss of the pedal tip and the claw.

  Therefore, according to the present invention, the arm end portion is formed so that a gap is formed between the arm end portion and the back surface of the pedal in the engaged state. It will be easy.

  Furthermore, the elevating wheel device according to the present invention is “provided on the side surface of the support, and restricts the rotation of the pedal to the engagement angle around the second axis when the pedal is depressed, A guide portion for guiding the pedal tip portion to the claw portion along its outer shape ”may be provided.

  Here, the guide part is for urging the pedal to rotate in the opposite direction around the second axis so that the pedal does not take an engagement angle until the pedal tip part comes into contact with the claw part. If the lifting arm is rotated around the first axis by stepping on the pedal, if the pedal rotates around the second axis and takes an engagement angle, the friction between the pedal tip and the support body is large. The pedal depression becomes tight.

  Therefore, by providing such a guide portion on the side surface of the support body in a range from the pedal tip portion coming into contact with the claw portion when the lifting arm is pushed down, the pedal tip portion is guided by the guide portion. It moves along the external shape of this, and it rotates around the 2nd axis | shaft naturally and taking an engagement angle is avoided. Examples of the shape of the guide portion include those in which a slope having an angle larger than the engagement angle is formed at the corner portion of the side surface of the support, and those formed in an arc shape.

  Therefore, according to the present invention, by providing the guide portion, it is possible to move the tip of the pedal so as to slide along the guide portion as the pedal is depressed, and to guide it to the position where it abuts the claw portion. Become. Thereby, it is not necessary to adjust the angle of the pedal with the foot, and the pedal tip can be easily pushed down to the engagement position with the claw simply by depressing the pedal.

  As described above, according to the lifting and lowering wheel device of the present invention, it is attached to an object such as a bed or a carriage, and a moving state in which the object can be moved by lowering the wheel, and the wheel is lifted and separated from the floor surface. The stationary state in which the wheel cannot be rotated is realized with a simple structure, and the wheel can be raised and lowered with a single pedal. In addition, since the support body supports the weight of the object with the entire structure in a stationary state, a load from the object is not locally applied. In addition, since the stationary state is extremely stable, it is possible to prevent the floor from being damaged unnecessarily. Furthermore, the degree of freedom in height from the floor surface that can be attached becomes large by setting the shaft position and the like.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a lifting wheel device that is the best embodiment for carrying out the present invention will be described with reference to FIGS. FIG. 1 (a) is an explanatory view showing an example of the lifting wheel device of the present invention, FIG. 1 (b) is a front view as seen from the pedal side, and FIG. 2 shows the object grounded by the lifting wheel device of FIG. It is explanatory drawing which shows the state to support, FIG. 3 is explanatory drawing which shows raising / lowering of the wheel in a raising / lowering wheel apparatus.

  The lifting wheel device 1 of the present embodiment includes a support body 2 that supports an object 40, a lifting arm 11 that is pivotally supported by the first shaft 10 with respect to the support body 2, and a second shaft that is supported by the lifting arm 11. Mainly includes a pedal 21 pivotally supported by 20, a wheel 8 pivotally supported with respect to the lifting arm 11 by a horizontal third shaft 9, and a claw portion 5 that engages with a pedal tip 22 of the pedal 21. Configured.

  More specifically, the support 2 is formed to have five surfaces by bending a single metal plate along four parallel straight lines as follows. That is, both sides of one central surface are bent at right angles in the same direction to form a pair of side surfaces (support body side surfaces) 7a and 7b, and the outside is bent at right angles in opposite directions to attach the object. A mounting portion 3 is formed. Here, the pair of support side surfaces 7 a and 7 b are bent so as to have the same height and become the side surfaces in the vertical direction of the support 2. In addition, on one surface of the center, a pair of ground support surfaces 4a and 4b are formed along a pair of sides orthogonal to the boundary line with the support side surfaces 7a and 7b, and the remaining central portion is cut out to dispose the wheels 8. A hole is formed. The shock absorber 31 is attached to the ground support surfaces 4a and 4b in order to ease the impact when the wheels 8 are raised and the ground support surfaces 4a and 4b come into contact with the floor surface 45. The attachment portion 3 is provided with an attachment hole 30 for attaching the lifting / lowering wheel device 1 to an object 40 such as a bed or a carriage by means of attachments 35 such as bolts and nuts.

  The lifting arm 11 is formed by bending a single metal plate along three parallel straight lines. Here, both sides of the central surface are bent at right angles in the same direction to form arm side surfaces 12a and 12b having the same height. Further, the central surface is excised leaving a portion for connecting the arm side surfaces 12a and 12b, and the wheel 8 is arranged so as to be sandwiched between the arm side surfaces 12a and 12b in the space generated by the excision. The

  Furthermore, the distance between the arm side surfaces 12a and 12b is set to be slightly shorter than the distance between the support side surfaces 7a and 7b, and the elevating arm 11 is disposed so as to be sandwiched between the support side surfaces 7a and 7b. . Then, in the vicinity of one end in the longitudinal direction of the lifting arm 11, the first shaft 10 is inserted into the support side surfaces 7 a, 7 b and the arm side surfaces 12 a, 12 b arranged inside thereof, thereby the lifting arm 11. Is supported by the first shaft 10 with respect to the support 2.

  In addition, long holes 35 are formed in the side surfaces 7a and 7b of the support body 2, and the third shaft 9 inserted through the arm side surfaces 12a and 12b is inserted into the long holes 35 and then the support side surfaces 7a and 7b. It is fastened by bolts and nuts from the outside of each. As a result, the third shaft 9 also rotates about the first axis 10 along the long hole 35 as the lifting arm 11 rotates about the first axis 10. That is, as the lifting arm 11 rotates, the wheel 8 supported by the lifting arm 11 moves up and down with respect to the ground support surfaces 4 a and 4 b of the support 2.

  Here, the position of the 1st axis | shaft 10 is set to bottom part vicinity of the support body side surface 7a, 7b. As a result, the height of the support 2 can be kept low relative to the diameter of the wheel 8. In the present embodiment, the height of the support 2 is about 56 mm with respect to the wheel 8 having a diameter of 50 mm.

  Further, the pedal 21 is pivotally supported by a second shaft 20 provided in the vicinity of an end portion of the elevating arm 11 facing the first shaft 10 so as to be rotatable. Here, the pedal 21 is formed in a T-shaped cross section as shown in FIG. 1B, and the T-shaped foot portion 27 is arranged in the center between the arm side surfaces 12 a and 12 b, and then the second shaft 20. Is inserted between the arm side surfaces 12a, 12b. At this time, the sleeve material 28 is disposed on both sides of the T-shaped foot portion 27 so as to fill the gap between the arm side surfaces 12 a and 12 b, and the pedal 21 does not rattle against the lifting arm 11. It can be rotated around.

  Further, the support side surfaces 7a and 7b are formed with claw portions 5 that can be locked so as to press down the pedal tip portion 22 from above. An arcuate guide portion 6 is formed in a range from the upper side of the corners of the support side surfaces 7a and 7b to which the pedal tip 22 abuts when the pedal 21 is pressed down to the claw portion 5.

  Further, the end on the second shaft 20 side of the arm side surfaces 12a and 12b is inclined so as to generate a gap (corresponding to the angle θ in FIG. 3B) with the back surface of the pedal 21 in the engaged state. The arm end portion 15 having the shape is formed. The portion following the arm end 15 of the arm side surfaces 12a and 12b, that is, the portion where the back surface of the pedal 21 abuts when the pedal 21 near the pedal tip 22 is depressed, In order to limit the excessive rotation beyond the engagement angle, it is formed with an inclination slightly larger than the engagement angle.

  Next, the usage method of the raising / lowering wheel apparatus 1 of this embodiment is demonstrated mainly using FIG.2 and FIG.3. First, the lifting wheel device 1 is attached to an object 40 such as a bed, a chair, or a carriage by using a mounting tool 35 such as a bolt and a nut, using the mounting hole 30 formed in the mounting portion 3 of the support 2. At this time, in a state where no force is applied to the lifting arm 11, the support 2 is grounded to the floor surface 45 at the ground support surfaces 4a and 4b by the weight of the object 40 as shown in FIG. Accordingly, the lifting arm 11 rotates about the first shaft 10 in the counterclockwise direction in the figure, and the wheel 8 supported by the lifting arm 11 is raised and accommodated in the support 2. As a result, the weight of the object 40 is supported by the entire structure including the side surfaces 7a and 7b of the support 2 and the grounding support surfaces 4a and 4b, and locally on the first shaft 10 and the second shaft 20 of the lifting arm 11 and the like. There is no load. Therefore, even when the heavy object 40 is placed in a stationary state for a long time, the elevating wheel device 1 is not likely to be damaged and can be used with confidence.

  And when moving the target object 40, the raising / lowering arm 11 is rotated around the 1st axis | shaft 10 by stepping on the pedal 21, and is pushed down. At this time, as shown in FIG. 3A, the pedal 21 naturally moves around the second axis 20 in the clockwise direction shown in the drawing while the pedal tip 22 moves so as to slide along the arcuate outer shape of the guide 6. To turn. Thereby, the raising / lowering arm 11 can be pushed down smoothly, without the pedal 21 taking an engagement angle. In addition, in FIG. 3A, FIG. 3B, and FIG. 3C, the target object 40 supported by the support 2 is omitted.

  Thereafter, when the elevating arm 11 is pushed down until the pedal tip 22 is positioned below the position of the claw 5 of the support 2, the pedal 21 near the pedal tip 22 is stepped on as shown in FIG. As shown in b), the pedal tip 22 can be engaged with the claw 5. At this time, the pedal 21 does not excessively rotate around the second shaft 20 beyond the engagement position with the claw portion 5 due to the inclination of the portion following the arm end portion 15 of the arm side surfaces 12a, 12b. The stepping operation of the pedal 21 can be easily performed. And since the force which presses down the pedal front-end | tip part 22 firmly from the top acts on the nail | claw part 5 with the weight of the target object 40 which the support body 2 supports, this engagement state is stably hold | maintained. In this engaged state, the wheel 8 supported by the elevating arm 11 is exposed below the ground support surfaces 4a and 4b of the support body 2, so that the object 40 is moved by rotating the wheel 8. Can do.

  When the object 40 is moved to a predetermined position by the rotation of the wheel and then brought into a stationary state again, the engaged state is released by the stepping operation of the pedal 21. At this time, as shown in FIG. 3B, since there is a gap corresponding to an angle θ between the back surface of the pedal 21 and the arm end 15, the pedal 21 is placed on the arm end 15 so as to eliminate this gap. Step in. As a result, as shown in FIG. 3C, the elevating arm 11 rotates in the illustrated clockwise direction around the first axis, and the pedal 21 rotates in the illustrated clockwise direction around the second axis. The engagement state is released without applying an excessive force to the portion 22 and the claw portion 5. Since no force is applied to the lifting arm 11, the wheel 8 is accommodated in the support 2 and the object 40 is grounded and supported by the support 2 as shown in FIG. 2 and described above. The Rukoto.

  As described above, according to the lifting / lowering wheel device 1 of the present embodiment, the lifting / lowering arm 11 that supports the wheel 8 is rotated around the first shaft 10, so that the grounding support surfaces 4 a and 4 b of the support body 2 are rotated. On the other hand, it is possible to raise and lower the wheel 8. As a result, the wheel 8 is lowered to move the object 40 by the rotation of the wheel 8, and the wheel 8 is raised to support the object 40 on the ground. Further, the pedal 21 attached to the lifting arm 11 can be easily lifted and lowered by the stepping operation.

  Furthermore, the height of the support 2 can be set according to the diameter of the wheel 8 depending on the length of the lifting arm 11 and the position of the first shaft 10. In this embodiment, the height of the support 2 is supported with respect to the wheel 8 having a diameter of 50 mm. It was possible to suppress the height of the body 2 to about 56 mm. Therefore, the attachable object 40 is wider than the conventional apparatus in which the height that can be attached is limited to more than a few tens of centimeters. For example, the lifting / lowering wheel device 1 of this embodiment is attached to the object 40 to which a small caster is attached, the wheel 8 is lowered, the object 40 is moved in cooperation with the small caster, and the wheel 8 is lifted. Thus, the object 40 is firmly grounded and supported, and a stable stationary state can be maintained.

  In addition, by allowing the pedal 21 to rotate about the second axis 20 with respect to the lifting arm 11, the pedal tip 22 is engaged with the claw 5 of the support 2, and the wheel 8 is lowered. Can be held, and this engagement state can be easily released by rotating the pedal 21 in the opposite direction. In other words, the state in which the wheel 8 is lowered can be maintained and released by an extremely simple structure of engagement between the pedal tip portion 22 and the claw portion 5 of the support 2. In addition, since the operation of lowering the wheel 8 and the operation of raising the wheel 8 can be performed by the single pedal 21, the operation is easy and convenient for the user.

  Further, since the support 2 supports the object 40 by grounding the entire structure in a stationary state, the lifting arm 11, the first shaft 10, the second shaft 20, and the like are not locally loaded, and the bed or the like Even when a heavy object is left stationary for a long time, it can be used without much demand for strength and durability. In addition, since the stationary state of the object 40 is extremely stable due to the grounding support of the support 2, even when the object itself has wheels, the floor surface 45 may be damaged unnecessarily due to wobbling or fine movement of the wheel, There is no fear that the installation position of the object is shifted.

  In addition, since the arm end portion 15 is formed so as to create a gap with the back surface of the pedal 21, the pedal 21 is moved around the second shaft 20 in order to release the engagement state of the pedal tip portion 22. It is easy to rotate the

  Moreover, the guide part 6 is formed in the support body 2, and it is not necessary to consider the angle of the pedal 21 by moving the pedal front-end | tip part 22 so that it may slide along the guide part 6 with depression of the pedal 21, By simply depressing the pedal 21, the pedal tip 22 is guided to the engagement position with the claw 5, and the pedal tip 22 can be easily engaged with the claw 5.

  The present invention has been described with reference to a preferred embodiment. However, the present invention is not limited to this embodiment, and various improvements and modifications can be made without departing from the spirit of the present invention as described below. Design changes are possible.

  For example, in this embodiment, the elevating arm is disposed on the inside of the support, but may be disposed on the outside of the support.

  In the present embodiment, the support is formed to have a pair of substantially rectangular side surfaces, but the support is formed as a frame, and the first shaft is inserted into a part of the frame. It is also possible to do. In this case, the third axis freely moves with the rotation of the lifting arm around the first axis without forming a structure such as a long hole in the support body so that the third axis can move. It becomes possible. However, considering that the support supports the object by grounding the entire structure, it is desirable that the structure has a large area capable of supporting the weight of the object as in this embodiment.

  Furthermore, in the present embodiment, the support is formed using a metal plate, but the material is not limited to this, and a material suitable for the object to be supported can be selected. For example, even if the support is made of wood, the support supports the object by its entire structure, so that it can sufficiently support the load of the object and gives a warm impression not found in metal. It can be. However, in this case, it is considered that the claw portion needs to be reinforced.

  Further, in the present embodiment, a straight wheel for straight travel is used, but if a free wheel that can turn around the vertical axis is used, the object can be easily bent. In this case, the configuration shown in FIG. 4 can be exemplified as a configuration in which the wheel is supported by the lifting arm. Here, Fig.4 (a) is explanatory drawing seen from the front of the wheel, (b) is explanatory drawing seen from the side. In FIG. 4, the same reference numerals are used for the same functions as those in the above embodiment. According to this configuration, the horizontal shaft 81 of the universal wheel 80 is inserted into the bearing 82 having a U-shaped cross section, and thereby the wheel 80 is supported so as to be sandwiched between the bearings 82. The vertical shaft 91 integral with the bearing 82 is fastened to the bearing 92 so as to be rotatable, and the horizontal shaft 81 and the vertical shaft 91 are separated from each other by a predetermined distance in the horizontal direction (FIG. 4). By setting (corresponding to x in (b)), the wheel 80 can turn around the vertical axis 91 together with the bearing 82. At this time, the bearing 92 through which the vertical shaft 91 is inserted is arranged so as to be sandwiched between the arm side surfaces 12a and 12b, and then inserted through the third shaft 9, thereby rotating around the first axis of the lifting arm 11 The wheel 80 moves up and down with the rotation. As a result, when the lifting arm is rotated around the first axis to move the object by lowering the wheel 80, the wheel 80 rotates around the horizontal axis 81 and can turn around the vertical axis 91. It is possible not only to go straight but also to make a turn. At this time, by inserting a seat plate 93 made of a material capable of reducing sliding friction between the bearing 92 and the bearing 82, the wheel 80 can turn around the vertical shaft 91 while supporting the weight of the object. It becomes easy. If the bearing 92 rotates around the third shaft 9, the grounding of the wheel 80 is hindered. For example, at least one of the upper side portions of the arm side surfaces 12 a and 12 b is extended to the bearing 92 side. The bent portion 94 is formed to be bent and brought into contact with the bearing 92, whereby the rotation of the bearing 92 around the third shaft 9 can be restricted. In addition, the height of the support 2 with respect to the diameter of the wheel 80 can be suppressed by setting the arm side surfaces 12a and 12b to pass the third shaft 9 as high as possible.

  Furthermore, it can also be made to be able to rotate and move on the floor surface in all directions by attaching a spherical body in place of the wheel.

(A) is explanatory drawing which shows an example of the raising / lowering wheel apparatus of this invention, (b) is the front view seen from the pedal side. It is explanatory drawing which shows the state in which the raising / lowering wheel apparatus of FIG. 1 grounds and supports a target object. It is explanatory drawing which shows raising / lowering of the wheel in the raising / lowering wheel apparatus of FIG. (A) is explanatory drawing which looked at the principal part of another example of the raising / lowering wheel apparatus of this invention from the front, (b) is explanatory drawing seen from the side. It is a side view which shows the outline of the conventional Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lifting wheel apparatus 2 Support body 3 Attachment part 4a, 4b Grounding support surface 5 Claw part 6 Guide part 7a, 7b Support body side surface 8 Wheel 9 3rd axis | shaft 10 1st axis | shaft 11 Lifting arm 15 Arm edge part 19 Limiting member 20 1st Biaxial 21 Pedal 22 Pedal tip

Claims (3)

An attachment portion attached to the object, and a support body having a grounding support surface that grounds and supports the object so as not to move;
A lifting arm that is pivotally supported by the first shaft relative to the support, extends to the outside of the support and rotates around the first shaft;
A pedal pivotally supported by a second shaft provided in the vicinity of the end of the lifting arm facing the first shaft;
In a state where it is pivotally supported by the elevating arm by a horizontal third axis, and ascends and descends with respect to the ground support surface as the elevating arm rotates around the first axis, and descends with respect to the ground support surface. Wheels capable of moving the object by rotation around the third axis;
A claw portion that is provided on a support side surface of the support body, and that engages with a pedal tip portion of the pedal to lock the lifting arm in a state where the wheel is lowered with respect to the ground support surface;
Comprising
The pedal rotates about the first axis of the lift arm by a stepping operation and rotates about the second axis to an engagement angle at which the pedal tip engages with the claw. And the said engagement state is cancelled | released by rotating in the direction opposite to this rotation, The raising / lowering wheel apparatus characterized by the above-mentioned. The elevating arm includes an arm end portion formed at an end portion on the second shaft side so as to have a slope that creates a gap with the back surface of the pedal in the engaged state,
The elevating wheel device according to claim 1, wherein the engagement state is released by depressing the pedal toward the arm end so as to eliminate the gap.   Provided on the side surface of the support body, and when the pedal is pushed down, the pedal tip portion extends along the outer shape to the claw portion while restricting the rotation of the pedal to the engagement angle around the second axis. The elevating wheel device according to claim 1, further comprising a guide unit that guides the vehicle.

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