JP4222049B2 - Work lifting tool - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a work lifting tool that holds and reverses a work at a predetermined height in an assembly process or the like.
[0002]
[Prior art]
In general, in an assembly line for industrial products such as automobiles, large workpieces are delivered or carried in a state of being stored in a pallet or the like. In this case, when parts cannot be assembled as they are, the work is lifted by a crane or the like, and the work is performed after setting the height and posture to be easy to work.
[0003]
In addition, various parts may be assembled to the work. For example, after attaching a part to the upper surface of the work, an operation of attaching another part to the back surface of the work may be performed. In order to perform such work, it is necessary to reverse the workpiece. For this reason, a jig has been proposed that can hold and rotate the workpiece while the workpiece is lifted (see, for example, Patent Document 1). ).
[0004]
[Patent Document 1]
Japanese Utility Model Laid-Open No. 2-2390
[Problems to be solved by the invention]
However, since the above conventional technique reverses the workpiece by changing the balancer position, the balancer position must be changed every time the workpiece is attached to the jig, which is not easy to use. was there. Moreover, in the above-mentioned technique, since the work is gripped using the clamp, there is a problem that the work of attaching the work is troublesome, and there is a problem that the cost is high because the clamp and the balancer are provided.
[0006]
The present invention has been made in view of such a problem, and an object of the present invention is to provide an easy-to-use work lifting tool with a very simple and inexpensive configuration.
[0007]
[Means for Solving the Problems]
For this reason, the work suspension tool of the present invention is formed so as to be capable of being suspended while being connected to the first frame in a circular arc shape according to the outer shape of the work, and to be rotatably connected to the first frame. and a second frame, when hung the frame second, vertical axis passing through the tension acting point of the second frame is configured to pass through the center of gravity of the workpiece, also, the the first frame and the connection position between the second frame is configured so as to be offset with respect to the arc length center of the first frame Rutotomoni, the frame first is the connecting position from the one end A first half that is a portion up to and a second half that is a portion from the connection position to the other end side and is shorter than the first half, and , when rotated first frame is held in the frame first workpiece Vertical line passing through the center of gravity crosses the frame first, half of the first frame first is characterized by being configured such that downward.
[0008]
Further, a stopper that restricts the rotational position and direction of the first frame may be provided in the vicinity of the connection position between the first frame and the second frame .
Is Raniwa rotation center axis relative to the second frame of the first frame may be configured to pass through the center of gravity of the workpiece.
[0009]
Further, the vertical axis and the rotation center axis may be configured to be orthogonal to each other.
Further, the first frame is constituted by a main frame and a sub frame which are connected to each other by a connection member, and when the work is reversed and non-reversed, either the main frame or the sub frame is used. You may comprise so that this workpiece | work may be supported.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a work suspension according to an embodiment of the present invention will be described with reference to the drawings. FIG.
As shown in FIG. 1, the work lifting tool 1 includes a first frame 2 and a second frame (support frame) 4. Of these, the first frame 2 has a main frame 5 formed by bending a member such as a steel pipe in an arc shape (particularly a semicircular shape in the present embodiment), and a position separated from the main frame 5 by a predetermined distance. It is composed of a main frame 5 and a subframe 6 provided in parallel. The main frame 5 and the sub frame 6 are integrally formed by welding or the like via the connection member 8. In the following description, the term “frame” refers to the first frame 2.
[0011]
Further, in the present embodiment, the work suspension tool 1 is for suspending a brake drum of an automobile (see reference numeral 40 in FIGS. 4 to 7), and the main frame 5 and the sub frame 6 are used as works. It is formed so as to match the shape of the brake drum 40. That is, each of the frames 5 and 6 is formed in a size corresponding to the diameter of the brake drum 40, and the convex portion 42 protruding from the outer periphery of the brake drum 40 can be locked between the frames 5 and 6. It is configured as follows.
[0012]
As shown in FIG. 1, the main frame 5 is provided with a grip 24 that an operator grips during work. A connecting member 10 that connects the support frame 4 and the main frame 5 is welded at a position that is offset from the center in the circumferential direction of the arc-shaped main frame 5.
As shown in FIGS. 2 and 3, the connecting member 10 is formed with a hole portion 14 through which one end 3 a of the shaft (support shaft) 3 can be inserted, and restricts the rotational direction and rotational position of the main frame 5. A stopper 12 is welded. Further, the one end 3 a side of the shaft 3 is fixed by a screw 18 while being inserted into the hole portion 14.
[0013]
On the other hand, as shown in FIG. 3, a hole 16 through which the other end 3 b of the shaft 3 can be inserted is also formed at the lower end of the support frame 4. And while the other end 3b side of the shaft 3 is rotatably inserted in this hole part 16, the thrust washer 20 is attached to the other end 3b of the shaft 3 via the screw 22, The support frame 4 and the main frame 5 are connected so as to be relatively rotatable.
[0014]
Further, as described above, the connection member 10 is attached to a position shifted from the center position of the main frame 5 (the center position with respect to the distance of the arc), whereby the connection member 10 is connected from one end side of the main frame 5. The distance L2 from the other end side of the main frame 5 to the connecting member 10 is set to be shorter than the distance L1 up to. In the following description, a portion from the one end side of the main frame 5 to the connecting member 10 (a portion corresponding to the distance L1) is referred to as a first half 5a of the main frame 5, and the remaining portion (that is, the main frame 5). The portion from the other end side to the connection member 10 (the portion corresponding to the distance L2) is referred to as a second half 5b of the main frame 5.
[0015]
The stopper 12 welded to the connecting member 10 regulates the rotation of the frame 2 by contacting the lower end of the support frame 4 as shown in FIG. In the state where 2 is in the horizontal position, the lower end of the support frame 4 and one end of the stopper 12 come into contact with each other. When the horizontal state is reversed 180 degrees from this horizontal state, the other end of the stopper 12 is now supported. Abutting on the lower end of the frame 4, the rotation of the frame 2 is restricted.
[0016]
Further, the rotation direction of the frame 2 is also regulated by such a stopper 12. That is, when the stopper 12 comes into contact with the support frame 4, the first half portion 5a of the main frame 5 is restricted from rotating above the horizontal position, and therefore the frame 2 is rotated. When doing so, the rotation direction of the frame 2 is regulated so that the first half 5a of the main frame 5 is always downward and the second half 5b is upward. That is, the vertical line passing through the center of gravity G of the workpiece 40 intersects with the frame 2 when the frame 2 rotates.
[0017]
By the way, the lifting tool 1 is devised in various ways in consideration of the balance when lifting the workpiece (brake drum) 40 as described above. That is, as described above, the main frame 5 is formed in an arc shape, and therefore a circle including the arc (hereinafter referred to as a virtual circle) exists. In this embodiment, the rotation center of the shaft 3 is present. The axis 34 is set to be parallel to the plane including the virtual circle. In addition, the rotation center shaft 34 is set so as to pass through the center of gravity G of the workpiece 40.
[0018]
Then, by setting the rotation center axis 34 of the frame 2 in parallel to the plane as described above, the frame 2 can be brought into the horizontal state again when the frame 2 is inverted 180 degrees from the horizontal state. When the rotation center axis 34 is at an angle with respect to the plane including the virtual circle, the horizontal state is not obtained when the frame 2 is inverted 180 degrees from the horizontal state.
[0019]
Further, by setting the rotary shaft 34 so as to pass through the center of gravity G of the workpiece 40, when the workpiece 40 is suspended, a rotational moment around the rotation central shaft 34 is not generated in the workpiece 40, and the weight of the workpiece 40 is reduced. Rotation due to is suppressed. As shown in FIG. 1, the first half 5a of the main frame 5 extends beyond an axis 36 perpendicular to the rotation center axis 34 of the shaft 3 and parallel to the plane. The second half 5b is formed so as not to exceed the shaft 36 described above. Further, as described above, the rotation direction of the frame 2 is restricted by the stopper 12 so that the first half 5a is always on the lower side, so that the first half 5a extends beyond the shaft 36. Thus (see FIG. 6), even if the frame 2 is rotated in a state where the workpiece 40 is suspended, the center of gravity G of the workpiece 40 surely acts on the first half portion 5a. It can be surely prevented from falling off.
[0020]
On the other hand, the support frame 4 is formed in a curved shape as shown in the figure, and a ring-shaped metal fitting 26 is attached to the upper end thereof. As shown in FIGS. 4 to 6, the metal fitting 26 is configured to be engageable with a hook 30 attached to the tip of the wire 28, and an operator engages the hook 30 and the metal fitting 26. Thereafter, the work 40 is suspended by operating a crane or the like (not shown).
[0021]
When the work 40 is lifted, the center line 32 of the wire 28 (vertical axis passing through the engagement point (tension acting point) between the metal fitting 26 and the hook 30) 32 passes through the center of gravity G of the work 40. Yes. And by setting in this way, when the workpiece | work 40 is suspended, the attitude | position change of the workpiece | work 40 containing the lifting tool 1 can be suppressed.
[0022]
Further, the vertical axis 32 and the rotation center axis 34 of the shaft 3 are set to be orthogonal to each other, so that the rotation center axis 34 is always held in a horizontal state in a state where the workpiece 40 is suspended. It has become. With such a configuration, the work 40 can be reversed efficiently and safely with a small force.
[0023]
Since the workpiece hanging tool according to one embodiment of the present invention is configured as described above, when actually used for work, for example, it is used as follows.
First, as shown in FIG. 4, the workpiece holder 1 is lifted in advance by a wire 28 or the like, and the height of the workpiece holder 1 is adjusted so that the height of the workpiece 40 and the frame 2 matches in this state. adjust. Then, as shown by an arrow in FIG. 4, the frame 2 is slid toward the workpiece 40 and is inserted into the frame 2 to hold the workpiece 40. At this time, specifically, the convex portion 42 of the work 40 enters between the main frame 5 and the sub-frame 6, and the work 40 is held by the main frame 5 (when not inverted).
[0024]
Next, the work 40 is pulled up to a height at which an operator can easily work with a crane or the like, and assembly work such as mounting of parts on the upper surface side of the work 40 is performed. After the completion of this work, if there is also assembly work on the lower surface side of the work 40, as shown in FIG. 5, the grip 24 is gripped and the frame 2 is rotated around the shaft 3 in the direction indicated by the arrow in the figure. .
[0025]
At this time, as shown in FIG. 6, when the frame 2 rotates, the longer half of the main frame 5 (that is, the first half 5a) is positioned on the lower side. The rotation direction is regulated by the stopper 12 and the first half 5a exists beyond the vertical axis 32 (in other words, the frame 2 exists beyond the vertical line passing through the center of gravity G of the workpiece 40). Therefore, it is possible to reliably prevent a situation where the workpiece 40 falls while the workpiece 40 is being reversed.
[0026]
Then, when the frame 2 is further rotated to become a horizontal state as shown in FIG. 7, the stopper 12 comes into contact with the lower end of the support frame 4 and further rotation is restricted, so that the frame 2 rotates more than necessary. Thus, the situation where the workpiece 40 falls can be avoided reliably. At this time (inversion), the work 40 is held by the subframe 6.
As described above, according to the work lifting tool of the present invention, since the frame 2 is formed in accordance with the shape of the work 40, the work 40 can be simply inserted into the frame 2 without using a clamp or the like. 40 can be easily and reliably held, and the usability is improved. Further, since a clamp or the like is not necessary, there is an advantage that a very simple configuration can be obtained and the manufacturing can be performed at a very low cost.
[0027]
Further, the first half 5a of the main frame 5 is set to exist beyond the vertical axis 32 passing through the center of gravity G during the reversing operation of the frame 2, and the first half 5a is disposed during the reversing operation of the workpiece 40. Since the rotation direction of the frame 2 is regulated by the stopper 12 so that the portion 5a is on the lower side, there is an advantage that the work 40 can be reliably prevented from dropping during the reversing operation.
[0028]
Also, since the center line (vertical axis) 32 of the wire 28 passes through the center of gravity G of the workpiece 40 when the workpiece 40 is lifted, the posture change of the workpiece 40 when the workpiece 40 is suspended is set. In addition to improving safety during work, it is also possible to improve work efficiency.
Further, since the rotation center axis 36 of the shaft 3 is set so as to pass through the center of gravity G of the workpiece 40, no rotation moment is generated in the workpiece 40, and the workpiece 40 rotates even if the operator releases his / her hand from the grip 24. The posture of the frame 2 and the workpiece 40 can be maintained at an arbitrary position.
[0029]
The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. For example, in the above embodiment, the brake drum is applied as a work and the frame is formed in a semicircular shape matching the brake drum. However, it goes without saying that the present invention can be applied to various works. In this case, the shape of the frame may be formed in accordance with the work to be applied.
[0030]
【The invention's effect】
As described in detail above, according to the work lifting tool of the present invention, since the first frame is formed according to the shape of the work, the work can be easily and reliably held without using a clamp or the like. , Improve usability. Further, since a clamp or the like is not used, there is an advantage that a very simple configuration can be obtained and the manufacturing can be performed at a very low cost. Furthermore, when the workpiece is lifted, the vertical axis that passes through the tension action point is set so that it passes through the center of gravity of the workpiece. in addition to that it is possible to improve the safety of the time, Ru advantage there that it is possible to improve the work efficiency.
[0031]
The first frame is formed on an arc, and the connection position between the first frame and the second frame is offset with respect to the center of the arc length of the first frame. In addition, since the vertical line passing through the center of gravity of the workpiece intersects the first frame when the first frame rotates, the first frame is held in a state where the workpiece is suspended. be rotated, it acts on the first frame to ensure that the center of gravity G of the workpiece, there is an advantage that the drop from the work frame can be reliably prevented (claim 1).
[0032]
Further, since the rotation direction of the first frame is regulated in the direction in which the workpiece does not fall by the stopper, it is possible to reliably prevent the workpiece from dropping from the frame from this viewpoint. Also, since the rotational position of the first frame by the stopper is restricted, there is an advantage to reliably avoid a situation where the workpiece is rotated unnecessarily first frame falls (claim 2).
[0033]
In addition, since the rotation center axis of the first frame is set so that it passes through the center of gravity of the workpiece, the workpiece will not rotate when the workpiece is suspended, and the workpiece will rotate even if the operator releases the hand. There is nothing to do. Therefore, to hold the frame and the work posture at an arbitrary position, also has an advantage that it is possible to improve the operational safety and efficiency (claim 3).
[0034]
Further, since the vertical axis and the rotation center axis are set so as to be orthogonal to each other, there is an advantage that the rotation center axis can be always held in a horizontal state in a state where the workpiece is suspended. Further, there is an advantage that the work reversing work can be performed efficiently and safely with a small force (claim 4 ).
Further, the first frame is composed of a main frame and a sub frame connected by a connecting member, and when the work is reversed and non-reversed, the work is supported by either the main frame or the sub frame. There is an advantage that the work can be reliably held and the safety is further improved (claim 5 ).
[Brief description of the drawings]
FIG. 1 is a schematic perspective view showing an overall configuration of a workpiece suspension according to an embodiment of the present invention.
FIG. 2 is a schematic perspective view showing a configuration of a main part of a work lifting tool according to an embodiment of the present invention.
FIG. 3 is a schematic exploded perspective view showing a configuration of a main part of a work lifting tool according to an embodiment of the present invention.
FIG. 4 is a view for explaining the operation of the work lifting tool according to the embodiment of the present invention.
FIG. 5 is a view for explaining the operation of the work lifting tool according to the embodiment of the present invention.
FIG. 6 is a view for explaining the operation of the work lifting tool according to the embodiment of the present invention.
FIG. 7 is a view for explaining the operation of the work lifting tool according to the embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Work lifting tool 2 1st frame 3 Shaft 4 2nd frame 5 Main frame 6 Sub frame 12 Stopper 32 Vertical axis 34 Rotation center axis 40 Brake drum G as a work center of gravity

Claims (5)

A first frame formed in an arc shape according to the outer shape of the workpiece;
A second frame rotatably connected to the first frame and formed to be suspended;
When the second frame is suspended, the vertical axis passing through the tension action point of the second frame is configured to pass through the center of gravity of the workpiece ,
The connection position between the first frame and the second frame is configured to be offset with respect to the center of the arc length of the first frame, and the first frame is connected to the connection from one end side. A first half that is a portion up to a position and a second half that is a portion from the connection position to the other end side and is shorter than the first half,
When the first frame rotates, a vertical line passing through the center of gravity of the work held by the first frame intersects the first frame, and the first half of the first frame The workpiece holding tool, wherein the workpiece hanging tool is configured so as to face downward . Near the connection position between the frame and the second frame first, wherein the stopper for regulating the rotation position and the rotation direction of the frame first is provided, according to claim 1, wherein the workpiece Hanging tool. The work lifting tool according to claim 1 or 2 , wherein a rotation center axis of the first frame with respect to the second frame passes through the center of gravity of the work. The work lifting tool according to claim 3 , wherein the vertical axis and the rotation center axis are orthogonal to each other. The first frame is composed of a main frame and a sub frame that are connected with a connection member at an interval,
The reversal time and non-inverting time of the workpiece, characterized in that it is configured such that the workpiece is supported by one of the main frame and sub-frame, the workpiece lifting jig of claim 1, wherein.

Images