JP6498504B2 - Clamping device - Google Patents

Description

  The present invention relates to a clamping device for gripping and lifting a workpiece.

When exchanging the attachment of a hydraulic excavator, it is necessary to attach and detach the large-diameter shaft, and when attaching and detaching the shaft, grease is attached around the shaft and the shaft is heavy. Not only is the operation troublesome, but there is a problem that clothes, gloves, etc. are stained with grease.
It is desired that such a heavy-weight bar-shaped workpiece can be gripped and lifted by a mechanical device without relying on human hands.

  For gripping and lifting such a rod-shaped workpiece, a clamp is provided below the pantograph so that the workpiece can be gripped and lifted or the clamp can be opened by raising and lowering the connecting member that lifts the pantograph (See, for example, Patent Document 1).

  In addition, the tube member can be easily grasped or released by tilting the operation handle (see, for example, Patent Document 2), the cam is pressed against the inner surface of the cylindrical workpiece, and the workpiece is There is one that is lifted (see, for example, Patent Document 3).

JP 2005-041670 A JP 2010-106977 A JP 2012-106830 A

  The work hanging tool described in Patent Document 1 not only requires a complicated mechanism such as a pantograph, but may not have the desired action only by the configuration of the described locking claw and spring. There is.

  The clamping device described in Patent Document 2 is an apparatus in which an operator lifts a workpiece by hand using this device, and is not suitable for lifting a heavy workpiece, and is described in Patent Document 3. The inner suspension clamp is limited to a workpiece having a hole for lifting, and cannot grip or lift a workpiece such as a rod-shaped body.

  The present invention has been made in view of the above problems, and provides a clamping device that can easily and reliably grip and lift a workpiece having a bar shape or the like, and has a simple structure and easy operation. The purpose is that.

According to the present invention, the above problem is solved as follows.
(1) A clamp device comprising a suspension rod suspended by a suspension means, a pair of left and right upper links whose inner ends are pivotally attached to the suspension support with an upper shaft facing in the front-rear direction, An upper portion is pivotally attached to an outer end portion of the upper link with an outer shaft facing in the front-rear direction, a pair of left and right support rods hanging from the outer shaft, and attached to the lower end portions of the both support rods, and the inner end portion A pair of left and right gripping members that are capable of gripping a workpiece from the left and right sides by closing and pivoting together with a lower shaft facing in the front-rear direction, and the upper shaft is a straight line connecting the left and right outer shafts It is assumed that it is provided with a middle-fold holding means for preventing the upper part from being positioned and holding the lower part at all times.

According to such a configuration, when the apparatus is lowered from above the workpiece and the workpiece is gripped by the left and right gripping members and the lifting support is raised, the left and right upper links rotate outward and downward. At this time, the rotational moments of the upper links at that time act in a direction to close the left and right gripping members, and the workpiece can be gripped strongly by both gripping members.
When the device is further lowered after placing the workpiece at the target location, both gripping members are opened to the left and right with the lower shaft as the center. The workpiece can be easily detached from the member.
Therefore, it is possible to provide a clamping device that can grip and lift a workpiece easily and reliably, has a simple structure, and is easy to operate.

(2) In the above section (1), the center-fold holding means is an inter-axis distance regulating means for preventing the distance between the upper shaft and the lower shaft from becoming larger than a predetermined range.

  According to such a configuration, it is only necessary to connect the upper shaft and the lower shaft with a simple inter-axis distance regulating means such as a rope, and the structure of the entire apparatus can be simplified.

(3) In the above section (1), the shaft that restricts the folding means to limit the distance between the left and right outer shafts to be smaller than the sum of the distances from the upper shaft to the outer shaft in the left and right upper links. It is a distance control means.

  According to such a configuration, it is only necessary to connect the left and right outer shafts with a simple inter-axis distance regulating means such as a rope, and the structure of the entire apparatus can be simplified.

(4) In any one of the above items (1) to (3), when lifting the workpiece, the left and right outer shafts are positioned outside the attachment portion of the gripping member at the lower end of each support rod.

  According to such a configuration, the rotational moment of the left and right upper links can be increased, and the gripping force of the workpiece by both gripping members can be increased.

(5) In any one of the above items (1) to (4), an open state holding means for holding the left and right gripping members in an open state is provided.

  According to such a configuration, the workpiece is placed on the target location, the apparatus is further lowered, and the both holding members are opened, and the open state holding means is operated, whereby both the holding members are removed from the workpiece. It can be easily removed.

(6) In the above item (5), the open state holding means restricts the distance between the left and right outer shafts in a state where the left and right gripping members are open, and by releasing the restriction, The second inter-axis distance regulating means is allowed to be closed.

  According to such a configuration, the left and right outer shafts need only be engaged and disengaged by the second inter-axis distance regulating means such as a locking lever, and the structure of the entire apparatus can be simplified.

  According to the present invention, it is possible to provide a clamping device that can grip and lift a workpiece easily and reliably, has a simple structure, and is easy to operate.

It is a front view which shows the state before hold | griping a workpiece | work by 1st Embodiment of the clamp apparatus of this invention. Similarly, it is a front view which shows the state which hold | gripped and lifted the workpiece | work. Similarly, it is a front view which shows the state which made the workpiece | work detach | leave. FIG. 4 is a transverse sectional view taken along line IV-IV in FIG. 2. It is a cross-sectional view in the VV line of FIG. It is a front view which shows the state before hold | griping a workpiece | work by 2nd Embodiment of the clamp apparatus of this invention. It is a front view which shows the state before hold | griping a workpiece | work by 3rd Embodiment of the clamp apparatus of this invention. Similarly, it is a front view showing a state when detaching the work.

Hereinafter, embodiments of a clamping device of the present invention will be described with reference to the drawings.
1 to 5 show a first embodiment of the clamping device of the present invention.
This clamping device includes a suspension rod 1 suspended by a crane, a hydraulic excavator, and other suspension means (all not shown), and an inner shaft having an upper shaft 2 directed in the front-rear direction at the lower end of the suspension rod 1. A pair of left and right upper links 3, 3 that are pivotally attached to each other, and an outer shaft 4 that faces in the front-rear direction at the outer end of each upper link 3, and an upper end that is pivoted from the outer shaft 4. The pair of support rods 5 and 5 and the lower ends of the support rods 5 and 5 are attached to each other, and the inner ends thereof are pivotally attached to each other with a lower shaft 6 facing in the front-rear direction, so that the workpiece 7 can be gripped from the left and right. The pair of left and right grip members 8 and 8 and the upper shaft 2 are prevented from moving above a straight line L1 connecting the left and right outer shafts 4 and 4 and are always held below the straight line L1. A middle folding holding means 9 is provided.

  An attachment hole 1a for attaching the device of the present invention to the suspension means is provided at the upper end of the suspension rod 1.

  The horizontal distance L2 from the upper shaft 2 to the outer shaft 4 in the left and right upper links 3 when lifting the workpiece 7 shown in FIG. 2 is from the attachment portion 10 of the gripping member 8 to the lower shaft 6 at the lower end portion of each support rod 5. It is preferable that the left and right outer shafts 4 and 4 are positioned outside the mounting portion 10 when the workpiece 7 is lifted.

  The left and right gripping members 8 are formed of a steel strip having a reinforcing bead 8a projecting at the center in the width direction, which is the front-rear direction, and bent into a semicircular arc to form a gripping portion 8b. The portions are bent upward to form the upright pieces 8c, and the edge portions on the opposite sides of the upright pieces 8c are cut and raised inward to form the bearing portions 8d. The left and right bearing portions 8d, 8d are The two gripping portions 8b and 8b can be opened and closed around the lower shaft 6 by being pivotally attached to each other with the lower shaft 6.

A mounting portion 10 is provided on the outer surface of a portion slightly below the central portion in the vertical direction of each gripping portion 8b, and the lower end portion of each support rod 5 is welded thereto.
A bearing piece (not shown) is fixed to the mounting portion 10 on the outer surface of each gripping portion 8b, and this bearing piece is pivotally attached to the lower end portion of each support rod 5 with a shaft (not shown) facing in the front-rear direction. There is also.

  The radius of curvature of the inner surface of each gripping part 8b is preferably the same as or close to the outer diameter of the round bar-shaped workpiece 7 to be gripped.

  In this first embodiment, the center-fold holding means 9 is an inter-axis distance regulating means 11 that prevents the distance between the upper shaft 2 and the lower shaft 6 from becoming larger than a predetermined range. Specifically, a flexible wire, or a rope such as a chain, whose upper end is fixed to a stop ring 12 externally fitted to the upper shaft 2 and whose lower end is fixed to a stop ring 13 externally fitted to the lower shaft 6. 14.

As shown in FIG. 1, the length of the rope 14 is such that the opening width W between the lower ends of the left and right gripping portions 8b and 8b when the hanging rod 1 is lifted without gripping the workpiece 7 is as shown in FIG. The half-open width W1 as shown in FIG.
This half-open width W1 is such that when the left and right gripping portions 8b and 8b are lowered from directly above the round bar-shaped workpiece 7, the lower ends of both gripping portions 8b and 8b are in sliding contact with the outer peripheral surface of the workpiece 7 and The dimensions are preferably such that they can be opened.
Further, as shown in FIG. 2, the half-open width W1 is preferably smaller than the opening width W2 between the lower ends of the left and right gripping portions 8b and 8b when the workpiece 7 is gripped and lifted.

  In this example, the upper shaft 2, the outer shaft 4, and the lower shaft 6 are all composed of a bolt and a double nut, but may be composed of a headed pin and a split pin, or may have other structures. .

  According to the first embodiment, as shown in FIG. 1, when the hanging rod 1 is lowered by the hanging means immediately above the workpiece 7 placed on the floor surface F, the half-open state is maintained. As shown by the arrows in FIG. 1, the lower ends of the left and right gripping members 8, 8 are in contact with the outer peripheral surface of the work 7 and then slide along the outer peripheral surface. Once opened to the left and right, they are closed again and the inner surfaces of the gripping portions 8b, 8b of the gripping members 8, 8 are brought into close contact with or in contact with the outer peripheral surface of the workpiece 7 to grip the workpiece 7.

  The left and right support rods 5 and 5 and the outer shafts 4 and 4 are moved up and down and the left and right upper links 3 and 3 are also turned up and down in accordance with the opening and closing operation of the gripping members 8 and 8 at this time. Finally, when the left and right gripping members 8 and 8 securely grip the workpiece 7, the gripping members 8 and 8 grip the workpiece 7 in a slightly opened state as compared with the half-open state shown in FIG. The distance between the upper shaft 2 and the lower shaft 6 is slightly shorter than that shown in FIG. 1, and the rope 14 is slack (see FIG. 2).

  In this state, when the suspension rod 1 is pulled up by the suspension means, the left and right upper links 3 and 3 try to rotate outward and downward as indicated by arrows in FIG. The rotational moments 3 and 3 act in the direction of closing the left and right gripping members 8 and 8, and the workpiece 7 can be gripped strongly by the gripping members 8 and 8.

  When the workpiece 7 is lifted, the left and right outer shafts 4, 4 are positioned outside the gripping member mounting portion 10 at the lower end of each support rod 5. The dynamic moment can be increased, and the gripping force of the workpiece 7 by both gripping members 8 and 8 can be further increased.

  Further, the mass of the workpiece 7 at this time acts so as to increase the moment for closing the gripping members 8, 8, and the gripping force of the workpiece 7 by the gripping members 8, 8 increases as the mass of the workpiece 7 increases. It becomes.

  As shown in FIG. 3, after the work 7 is placed on the floor surface F (or other part) at the target location and the like, when the hanging rod 1 is further lowered, the left and right sides are moved by the lowering of the hanging rod 1. The outer end portions of the upper links 3 and 3 are rotated inward from each other, and the gripping members 8 and 8 have a continuous corner portion between the gripping portion 8 b and the upright piece 8 c on the outer peripheral surface of the work 7. It abuts and opens to the left and right about the lower shaft 6 as shown by the arrows in FIG.

  From this state, the upper end portions of both or either of the left and right support rods 5 and 5 are held so as not to spread outward from the state shown in FIG. 3, or both or either of the left and right grip members 8 and 8 are held. When the suspension rod 1 is pulled up by the suspension means in a state where either one is not closed, both gripping members 8 and 8 are detached from the workpiece 7 upward.

  When the holding members 8 and 8 and the other members are released from the holding state of the support rod 5 or the holding member 8 after the holding members 8 and 8 are completely separated upward from the workpiece 7, the holding members 8 and 8 and other members are shown in FIG. Return to the state.

  Therefore, according to the first embodiment, the workpiece 7 can be easily and reliably grasped and lifted or placed at another place by a simple operation with an apparatus having a simple structure.

  In addition, when exchanging the attachment of a hydraulic excavator, using this clamping device to grip and move the attachment mounting shaft can reduce the labor of the operator and soil the operator's clothes and gloves. Nothing will happen.

FIG. 6 shows a second embodiment of the clamping device of the present invention. Note that the same or similar members as those in the first embodiment are denoted by the same reference numerals and are not illustrated, and detailed description thereof is omitted (the same applies to the third embodiment). ).
In this second embodiment, instead of the center-fold holding means 9 in place of the inter-axis distance regulating means 11 in the first embodiment, the inter-axis distance L4 between the left and right outer shafts 4, 4 is changed to the left and right upper links. 3 and 3 as the inter-axis distance regulating means 15 for limiting the distance from the upper shaft 2 to the outer shaft 4 to be smaller than the sum of the distances L5 and L6. More specifically, the left and right outer shafts 4 and 4 are Longitudinal holes 16, 16 that are slidably fitted in the longitudinal direction and that face in the left-right direction are the linkage rods 17 that are provided in both sides and face in the left-right direction.

By this linkage rod 17, the distance L4 between the left and right outer shafts 4, 4 is limited as described above, and the upper shaft 2 is positioned above the straight line L1 connecting the left and right outer shafts 4, 4. Is prevented, and is always held so as to be positioned below.
Other configurations are the same as those in the first embodiment, and the second embodiment also functions in the same manner as in the first embodiment.

7 and 8 show a third embodiment of the clamping device of the present invention.
In the third embodiment, the same as the inter-shaft distance regulating means 15 constituting the folding holding means 9 in the second embodiment, and the open state in which the left and right gripping members 8 and 8 are held in an open state. The holding means 18 is combined.

More specifically, a long hole 20 that faces in the left-right direction is provided at the left end portion of the linkage rod 19 that faces the left-right direction with the right end pivotally attached to the right outer shaft 4. An upward engagement groove 21 is provided near the portion, and the left outer shaft 4 is slidable in the longitudinal direction in the long hole 20 and is detachably fitted in the engagement groove 21. As shown in FIG. 4, the left outer shaft 4 engages with the left end portion of the long hole 20, so that the shafts of the left and right outer shafts 4, 4 are the same as the inter-axis distance regulating means 15 in the second embodiment. The distance between the holding members 8 and 8 can be held in a half-open state by limiting the distance to L4, and the left outer shaft 4 is engaged with the engaging groove 21 as shown in FIG. The holding members 8, 8 can be held in an open state.
This linkage rod 19 not only constitutes the inter-axis distance regulating means 15 but also limits the inter-axis distance L7 between the left and right outer shafts 4 and 4 with the left and right gripping members 8 and 8 open. The second inter-axis distance restricting means 22 is configured to permit both the gripping members 8 and 8 to be closed by releasing the above, and the second inter-axis distance restricting means 22 is configured as an open state holding means. 18 is done.

In the third embodiment, as shown in FIG. 8, when the hanging rod 1 is lowered and the workpiece 7 is placed at a target location, and then the hanging rod 1 is further lowered, 8 and 8 are opened to each other in the same manner as in the first embodiment, and the left and right outer sides are lifted by raising the left and right support rods 5 and 5 and turning the left and right upper links 3 and 3 upward. The shafts 4 and 4 move so as to approach each other, and the left outer shaft 4 engages with the engagement groove 21.
At this time, the linkage rod 19 is rotated slightly downward at the left end by its own weight.

In this state, when the hanging rod 1 is lifted, the left and right gripping members 8 and 8 are restrained in an open state, and are smoothly detached upward from the workpiece 7.
When the left and right gripping members 8 and 8 are positioned above the workpiece 7, when the handle 19a provided at the left end of the linkage rod 19 is lifted, the left outer shaft 4 is disengaged from the engagement groove 21 and is long. While engaging with the left end of the hole 20, the left and right gripping members 8, 8 return to the half-open state shown in FIG.

Therefore, according to the third embodiment, the open state holding means 18 is activated simply by placing the work 7 at a target location, further lowering the apparatus, and opening both gripping members 8, 8. Both gripping members 8 and 8 can be easily detached from the work 7.
Further, the operating state of the open state holding means 18 can be easily released by slightly lifting the handle 19a at the left end of the linkage rod 19.

  Furthermore, when the open state holding means 18 is configured by the second inter-axis distance regulating means 22 as described above, the left and right outer shafts 4 and 4 are connected to the linkage rod 19 or a hook-shaped locking lever (not shown). The structure of the entire apparatus can be simplified by simply engaging and disengaging with such a simple structure.

In the first to third embodiments, the workpiece 7 has a round bar shape, but is not limited thereto, and a workpiece having a non-circular cross section can be gripped and lifted.
However, depending on the shape of the workpiece, as described above, there are some that cannot be gripped only by lowering the suspension support rod 1 from directly above the workpiece. In this case, the operator holds both grips immediately before gripping the workpiece. What is necessary is just to expand the members 8 and 8 to right and left.

The present invention is not limited to the first to third embodiments described above, and can be implemented in the following modified mode, for example.
(1) Instead of the inter-axis distance regulating means 11 composed of the rope 14, the suspension rod 1 is extended downward from the upper shaft 2, and a long hole (not shown) is directed to the lower end portion of the extended portion. ) And the lower shaft 6 is slidably fitted in the elongated hole so that the distance between the upper shaft 2 and the lower shaft 6 is within a predetermined range in the same manner as the rope 14. The inter-shaft distance regulating means is used to prevent the distance from becoming larger.
(2) The second inter-axis distance regulating means 22 has a base end pivotally attached to one outer shaft 4 and a handle similar to the handle 19a in the third embodiment and a downward hook at the other end. When the left and right gripping members 8, 8 are open to each other, the hook of the locking lever is locked to the other outer shaft 4 from above, thereby holding the open state holding means. 18, the handle is pivoted upward, and the hook of the locking lever is detached from the other outer shaft 4 so that the open state holding state can be released.
(3) A handle for manual operation is provided at the outer end of either or both of the left and right upper links 3, 3 or the upper end of both or either of the left and right support rods 5, 5.

F Floor L1 straight line L2, L3 Horizontal distance L4 Distance between axes L5, L6 Distance L7 Distance between axes W Opening width W1 Half-opening width W2 Opening width 1 Suspension rod 1a Mounting hole 2 Upper shaft 3 Upper link 4 Outer shaft 5 Support rod 6 Lower shaft 7 Work piece 8 Holding member 8a Bead 8b Holding portion 8c Standing piece 8d Bearing portion 9 Centering holding means 10 Mounting portion 11 Axial distance regulating means 12, 13 Stop ring 14 Rope 15 Axis distance regulating means 16 Long hole 17 linkage rod 18 open state holding means 19 linkage rod 19a handle 20 long hole 21 engagement groove 22 second inter-axis distance regulating means

Claims (6)

A suspension rod supported by the suspension means;
A pair of left and right upper links whose inner ends are pivotally attached to the suspension support with an upper shaft facing in the front-rear direction;
A pair of left and right support rods, the upper part of which is pivotally attached to the outer end of the upper link with an outer shaft facing in the front-back direction,
A pair of left and right gripping members attached to the lower ends of the support rods and having inner ends pivoted to each other with a lower shaft facing in the front-rear direction, and capable of gripping the workpiece from the left and right;
A clamping device comprising: a middle-fold holding means for preventing the upper shaft from being positioned above a straight line connecting the left and right outer shafts and holding the upper shaft so as to be always positioned below.   2. The clamping device according to claim 1, wherein the intermediate folding holding means is an inter-axis distance regulating means for preventing the distance between the upper shaft and the lower shaft from becoming larger than a predetermined range.   2. An inter-shaft distance restricting means that restricts the distance between the left and right outer shafts to be smaller than the sum of the distances from the upper shaft to the outer shaft in the left and right upper links. Clamping device.   The clamp device according to any one of claims 1 to 3, wherein the left and right outer shafts are positioned outside the attachment portion of the gripping member at the lower end portion of each support rod when the workpiece is lifted.   The clamp apparatus in any one of Claims 1-4 which provided the open state holding means which hold | maintains a right-and-left holding member in the open state.   The open state holding means is configured to restrict the distance between the left and right outer shafts in a state where the left and right gripping members are open, and to allow the both gripping members to be closed by releasing the restriction. The clamping device according to claim 5, which is a biaxial distance regulating means.

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