JP2008068975A - Coupling device for lifting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coupling device for lifting having required strength and capable of reducing mass. <P>SOLUTION: A main shaft part 1 fitted into a through hole in an object to be lifted sideways is constituted to fix an object 8 molded by synthetic resin to a central part of a steel bar 6 and composes a shaft axis part and an upper side part or a lower side part of the steel bar and a left side part and a right side part and the lower side part or the upper side part of the object molded by synthetic resin. A coming-off prevention mechanism 2 constitutes a bar-like part 21 by a front end part of the steel bar protruding onto a front side of the main shaft part, fixes a fixing plate 24 to the bar-like part by passing through a movable plate 22, sandwiches the movable plate in between the fixing plate and the main shaft part to move it in the vertical direction, prevents the movable plate from protruding onto an outer side from a position of an outer peripheral face of the main shaft part when the coupling device takes the upside down attitude, and protrudes the movable plate onto a lower side from the position of the outer peripheral face of the main shaft part when the coupling device takes the normal up and down attitude in pulling-out and insertion situation to realize coming-off prevention situation. A hoisting rope connection part 3 constitutes a main body 31 by a rear end part of the steel bar protruding onto a rear side of the main shaft part, and a connection hole 32 passes through the body. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a connector that is attached to a hole of an object in order to connect a suspension cable to the object to be lifted.

  The block constituting the retaining wall and the water channel is composed of a wall plate portion and a bottom plate portion, and is an L-shaped concrete molded product. The wall board part has penetrated the drain hole horizontally. When this block is lifted, a shaft-like connector is inserted laterally into the drain hole and through-hole of the wall plate portion to prevent the connector from coming off, and the end of the suspension cable is connected to the end of the connector. A suspension cable such as a rope or a chain is connected to the L-shaped block via a connector attached to the through hole of the wall plate.

  An axial connector is disclosed in Patent Document 1. This connector is provided with a main shaft portion that is fitted sideways into the through hole of the block. The main shaft portion has a round shaft shape in which the cross-sectional shape is a circle similar to the through hole of the block.

  The main shaft portion is provided with a retaining mechanism at the front end. The retaining mechanism has a small-diameter shaft connected to the front end of the main shaft portion. The small-diameter shaft is thinner than the main shaft portion and is eccentric from the axis of the main shaft portion. The small-diameter shaft is skewered with a movable plate penetrating the long hole. A fixed plate is fixed to the front end of the small-diameter shaft concentrically with the main shaft portion. The movable plate is located between the main shaft portion and the fixed plate, the small-diameter shaft passes through the long hole, and is movable in the long-diameter direction of the long hole. Each of the movable plate and the fixed plate is slightly smaller in diameter than the main shaft portion.

  Further, the main shaft portion is provided with a rope hooking portion at the rear end via a flange portion. The rope hooking portion is bent into an L shape and penetrates the rope insertion hole through the bent piece. The protruding direction of the bent piece is opposite to the eccentric direction of the small-diameter shaft of the retaining mechanism.

  When this connector is used, it grips the rope hook and holds it sideways along the front-rear direction. At that time, the bent piece of the rope hook portion has the protruding direction downward. Then, the axis of the small-diameter shaft of the retaining mechanism is above the axis of the main shaft portion. The movable plate is located at the lower end by its own weight and is concentric with the main shaft portion, and does not protrude outward from the position of the outer peripheral surface of the main shaft portion. In other words, the connecting tool is in an upside down posture and is ready for insertion and removal. The connector is moved forward while maintaining the insertion / removal posture, and is inserted sideways into the through hole of the wall plate portion of the block. The front end including the movable plate of the connector passes through the through hole and protrudes outside the through hole. The main shaft portion is fitted into the through hole. The rear end including the rope hook does not enter the through hole.

  Next, the connector rotates halfway around the axis of the main shaft portion while maintaining the state where the movable plate protrudes outside the through hole. Make the protruding direction of the bent piece of the rope hook part upward. Then, the shaft center of the small diameter shaft is below the shaft center of the main shaft portion. The movable plate descends by its own weight, deviates from the axis of the main shaft portion to the lower side, and the lower portion projects downward from the outer peripheral surface position of the main shaft portion. That is, the connecting tool is in a normal posture for lifting and a posture for preventing it from coming off. When the coupling tool is to be pulled out in the retaining posture, the lower portion of the movable plate hits the lower edge portion of the through hole of the wall plate portion of the block and does not come off.

  The connection tool, after preventing the connection, connects the rope to the rope insertion hole of the upward bent piece of the rope hook.

Japanese Patent No. 2551532

[Issues of background technology]
1) The lifting connection tool of Patent Document 1 is a cast product in which at least a main shaft portion, a flange portion, and a rope hook portion are integrated. Most of them are cast iron ingots, so the mass is high. It is heavy and difficult to handle.

  When the operator carries the connector to the position of the through-hole of the block to be lifted, it is difficult to carry it with one hand, and both hands are required. You can only carry one by one. Inserting into the through-hole of the block and half-turning is difficult with one hand and requires both hands. In addition, there is a great risk of hurting people or damaging things when accidentally dropped from the hand.

  2) The above connecting tool has only one rope insertion hole in the rope hook. The lifting position cannot be adjusted in the front-rear direction.

  When the block is lifted via a connecting tool attached to the through hole and a rope connected to the rope insertion hole of the connecting tool, the lifting position may be far from the vertical line passing through the center of gravity of the block. If the lifting position is far from the vertical line of the center of gravity, the posture of the block is greatly inclined in the air when it is lifted. If the posture is greatly inclined in the lifted state, it is difficult to lower and install.

  3) The above-mentioned connecting tool can be connected by inserting a rope into the rope insertion hole in the same manner whether it is in a retaining position or in a pulling-out position.

  When the connector is in a state of insertion / removal, that is, when the connector is not secured, it is dangerous to connect the rope to the rope insertion hole and perform the lifting operation.

[Idea for solving problems]
1) In order to maintain the strength and reduce the mass of the coupler for lifting, the material is a combination of steel having higher strength than cast iron and synthetic resin having lower density than cast iron. The main structure is that the steel bar is passed through in the front-rear direction to be the main strength material, and the molded product of synthetic resin is assembled to the part where the thickness of the steel bar is insufficient.

  The steel bar has a central part that is the central part of the main shaft part of the connector and its upper or lower part, a front end that is a rod-shaped part of the connector retaining mechanism, and a rear end that is a suspension cable for the connector. Make the main part of the connecting part. The main shaft portion of the coupling tool is made of a synthetic resin molded product at a portion not formed of a steel bar, a left side portion and a right side portion, and a lower side portion or an upper side portion.

  In addition, in order to further reduce the mass of the main shaft portion, a hollow portion is provided between the left and right side surfaces of the steel bar and the inner surface of the synthetic resin molded product facing the same.

  2) In order to make it possible to adjust the lifting position in the front-rear direction, the lifting connection tool is provided with a plurality of connection holes in the lifting line connecting portion at intervals in the front-rear direction.

  3) The lifting connector uses a shackle that opens and closes the opening of the U-shaped body with a pin to connect the lifting cable to the connecting hole of the lifting cable connecting part, and the U-shaped body of the shackle is attached to the lifting cable connecting part. The shackle stopper piece that restricts the fitting direction is provided.

  When the connection tool is in a retaining posture, the U-shaped body of the shackle can be fitted into the suspension cable connection portion from above. However, when the connector is in the insertion / removal state, the shackle stopper prevents the U-shaped body from being fitted into the suspension cable connecting portion from above.

1) The main shaft portion that is fitted sideways into the through-hole of the object to be lifted is a lifting connector provided with a retaining mechanism at the front end and a suspension cable connecting portion at the rear end,
The main shaft has a synthetic resin molded product fixed to the center of the steel bar, the shaft center and upper or lower part are steel bars, and the left and right and lower or upper parts are made of synthetic resin. Composed of molded products,
The retaining mechanism comprises a rod-shaped part at the front end of the steel bar that protrudes to the front side of the main shaft, penetrates the movable plate to the steel rod front end of the rod-shaped part, fixes the fixed plate, and fixes the movable plate. It can be sandwiched between the plate and the main shaft and moved up and down.
When the connector is in the upside down posture, the movable plate does not protrude outward from the outer peripheral surface position of the main shaft portion, and is in a state of being pulled out and inserted, and when the connector is in the normal vertical posture, the movable plate is positioned at the outer peripheral surface position of the main shaft portion. It protrudes further downward and has a structure that prevents it from coming off,
The suspension cable connecting portion is characterized in that a main body is constituted by a rear end portion of a steel bar protruding to the rear side of the main shaft portion, and a connecting hole is penetrated in the left-right direction at the rear end portion of the steel bar of the main body.

2) In the above lifting coupler,
The main shaft portion is characterized in that a hollow portion is provided between the left and right side surfaces of the central portion of the steel bar and the inner surface of the synthetic resin molded product facing the same.

3) In the above lifting coupler,
The suspension rope connecting portion is characterized in that connecting holes are provided at a plurality of locations at intervals in the front-rear direction.

4) In the above lifting coupler,
The suspension cable connecting portion has a configuration in which a shackle is interposed to connect the suspension cable to the connection hole of the main body, and a shackle stopper piece is provided on the lower side of the main body,
When the connector is in a position to prevent it from coming off, the U-shaped body of the shackle is fitted into the main body from above, and the pin of the shackle can be inserted into the connecting hole of the main body and the pin hole of the U-shaped body,
When the connector is in the insertion / removal state, the shackle stopper piece prevents the U-shaped body from being fitted into the main body from above.

  The lifting coupler uses a high strength steel bar material in the front-rear direction as a main load-bearing material, and a low-density synthetic resin molded product is assembled to the main shaft portion that is insufficient in thickness. It is possible to reduce the mass with the necessary strength as a lifting coupler. Lighter than conventional products and easy to handle.

  As shown in FIGS. 1 to 6, the lifting coupler of the embodiment is provided with a main shaft portion 1 having a round shaft shape, a retaining mechanism 2 in front of the main shaft portion 1, and a suspension rope connecting portion after the main shaft portion 1. 3 is provided in series.

  This connector uses a steel bar 6 as a main bearing material. The steel bar 6 is made of steel, which is a general structural rolled steel in the embodiment, and has a rectangular bar shape with a vertically long rectangular cross section as shown in FIG. A synthetic resin molded product 7 is assembled to the steel bar 6. The synthetic resin molded product 7 is made of a polypropylene resin, in the embodiment, a glass fiber reinforced polypropylene resin, and is composed of a left half product and a right half product that are substantially symmetrical. As shown in FIG. 8, the synthetic resin molded product 7 on one side is provided with a half-round shaft shape portion 8 for the main shaft portion 1, and a half for the suspension rope connecting portion 3 at the rear end of the half-round shaft shape portion 8. A split rod-like portion 9 is provided in series.

  As shown in FIGS. 1 to 3, the main shaft portion 1 has a half-round shaft-shaped portion 8 of the synthetic resin molded product 7 assembled to the center portion of the steel bar 6 from the left and right. As shown in FIG. 7, the central portion of the steel bar 6 has an upper surface 11 formed into a convex curved surface and penetrates the bolt hole 12 in the left-right direction. The bolt holes 12 are provided at a plurality of locations at intervals in the front-rear direction. As shown in FIG. 8, the half-round shaft-shaped portion 8 has a groove 13 formed in the inner upper portion and penetrates bolt holes 14 and 15 in the left and right directions in the upper and lower portions, respectively. The upper bolt hole 14 opens into the groove 13. The upper and lower bolt holes 14 and 15 are provided at a plurality of locations at intervals in the front-rear direction.

  The center part of the steel bar 6 is fitted and penetrated into the upper groove 13 of the half-round shaft-shaped part 8 on both sides. The upper part of the half round shaft-shaped part 8 on both sides and the center part of the steel bar 6 penetrate the bolt 16 through the bolt hole 14 and the bolt hole 12, and screw the nut into the bolt 16. It is fixed. The lower portions of the halved round shaft-shaped portions 8 on both sides pass through the bolts 17 through the bolt holes 15, screw nuts into the bolts 17, and are fixed with the bolts 17 and nuts. The bolts 16 and 17 and the nut are made of steel, and in the embodiment, high tensile steel.

  The main shaft portion 1 having a round shaft shape has a shaft center portion and an upper portion thereof formed by a central portion of a steel bar 6, and a left side portion, a right side portion, and a lower side portion are formed by a half round shaft shape portion of a synthetic resin molded product 7. 8 is configured. The main shaft portion 1 has a tapered shaft shape that gradually decreases from the rear end toward the front end.

  The half-round shaft-shaped portion 8 is provided with a recess 18 on the inner surface except for the peripheral portion and the bolt holes 14 and 15 penetrating portions. The main shaft portion 1 forms a hollow portion by a recess 18 between the left and right side surfaces and the lower surface of the central portion of the steel bar 6 and the inner surface of the half-round shaft-shaped portion 8 facing the main shaft portion 1.

  As shown in FIGS. 1, 4, and 7, the retaining mechanism 2 constitutes a rod-shaped portion 21 by lowering the front end portion of the steel bar 6 protruding to the front side of the main shaft portion 1, and is movable to the rod-shaped portion 21. It penetrates the plate 22. The movable plate 22 is a disc that penetrates the long hole 23. Several movable plates 22 are juxtaposed in the front-rear direction. A disc fixing plate 24 is fixed to the front end of the rod-shaped portion 21 with a bolt 25. All the movable plates 22 are sandwiched between the fixed plate 24 and the main shaft portion 1. Each movable plate 22 has a rod-like portion 21 passing through the long hole 23 and is movable in the long diameter direction and the vertical direction of the long hole 23.

  When the connector is in the normal vertical position shown in FIG. 1, the movable plate 22 projects downward from the outer peripheral surface position of the main shaft portion 1 as shown in FIG. When the connector is in an upside down posture, the movable plate 22 does not protrude outward from the position of the outer peripheral surface of the main shaft portion 1 and is in a state of insertion / removal. The fixing plate 24 does not protrude outward from the position of the outer peripheral surface of the main shaft portion 1 in either a normal vertical orientation or an upside-down posture.

  The movable plate 22 is a synthetic resin molded product and is made of a polypropylene resin, and in the embodiment, a glass fiber reinforced polypropylene resin. The fixing plate 24 is made of steel, and in the embodiment, is general structural rolled steel. The bolt 25 is made of steel, and in the embodiment, high-tensile steel.

  As shown in FIGS. 1 and 5, the suspension rope connecting portion 3 has the rear end portion of the steel bar 6 protruding to the rear side of the main shaft portion 1 as the main body 31 as it is, and the main body 31 has a connecting hole 32 in the left-right direction. It penetrates. The connection holes 32 are provided at a plurality of locations at intervals in the front-rear direction.

  When connecting the suspension rope 33 such as a rope to the connection hole 32, as shown in FIG. 6, the shackles 34 and 35 are interposed. The U-shaped body 34 of the shackle straddles the main body 31 in the left-right direction and is fitted into the main body 31 from above. The shackle pins 35 are inserted into the pin holes and the connecting holes 32 on both sides of the U-shaped body 34.

  A shackle stopper piece 36 is provided on the lower side of the main body 31. The shackle stopper piece 36 is fitted into the lower part of the main body 31 on the upper surface of the half bar 9 of the synthetic resin molded product 7 on both sides and penetrates the lower parts of the half bar 9 on both sides in the left-right direction. It is fixed with a plurality of bolts 37 and nuts. The upper portions of the half-bar-shaped portions 9 on both sides protrude from the lower side of the main body 31 to the left and right sides, and the protruding width is wider than the opening width of the U-shaped body 34.

  When the connector is in the upside down posture and in the insertion / removal posture, the action of fitting the U-shaped body 34 of the shackle into the main body 31 from the upper side is stopped by the shackle stopper piece 36. When the connecting tool is in a normal vertical position and a retaining posture, the shackle U-shaped body 34 can be fitted into the main body 31 from above, and the shackle pin 35 can be inserted into the pin hole and the connecting hole 32 of the U-shaped body 34. .

When this connection tool is used to lift a retaining wall block of an L-shaped concrete molded product, it is as follows.
As shown in FIG. 9, the coupling tool is held in an upside down posture and an insertion / removal posture. The system is moved forward while maintaining its posture, and is inserted laterally into the drain hole and through hole H of the wall plate portion of the retaining wall block B. In this state, the suspension rope connecting portion 3 has the shackle stopper piece 36 positioned on the upper side of the main body 31 and cannot connect the shackles 34 and 35 to the main body 31 from the upper side.

  Next, the coupling tool maintains a state in which the movable plate 22 protrudes to the outside of the through hole H, and makes a half rotation around the axis of the main shaft portion 1. Then, as shown in FIG. 10, the coupling tool is in a normal vertical posture and a retaining posture. In the suspension cord connecting portion 3, the shackle stopper piece 36 is located below the main body 31. Therefore, the shackles 34 and 35 are connected to the main body 31 from above. The suspension wall 33 is connected to the retaining wall block B via a connecting tool attached to the through hole H and shackles 34 and 35 attached to the connecting tool. In addition, when connecting the shackles 34 and 35 to the main body 31, the connection hole 32 is selected so that the lifting position is close to the vertical line passing through the gravity center position of the retaining wall block B.

  In the embodiment, the connecting tool has a length in the front-rear direction of about 26 cm and the outer diameter of the main shaft portion 1 is about 7.5 cm. And the mass is less than 3 kg. Light and easy to handle.

[Modification]
1) In the above embodiment, the synthetic resin molded product 7 and the movable plate 22 are made of polypropylene resin, but other synthetic resins are used.
2) In the above-described embodiment, the round shaft-shaped main shaft portion 1 includes the shaft center portion and the upper side portion thereof with the steel bar 6, and the left side portion, the right side portion and the lower side portion with the synthetic resin molded product 7. However, the axial center portion and the lower side portion thereof are made of steel bars, and the left side portion, the right side portion and the upper side portion are made of a synthetic resin molded product.
3) In the above-described embodiment, the synthetic resin molded product 7 is composed of two bodies, a left half product and a right half product.
4) In the above embodiment, the shackle stopper 36 and the movable plate 22 are synthetic resin molded products, but are made of steel.
5) In the above embodiment, the movable plate 22 is a plurality of plates, but it is one.

  The present invention is used for lifting a retaining wall block, a water channel block and other heavy objects.

The side view of the coupler for lifting in the embodiment of the present invention. AA sectional view taken on the line AA of FIG. FIG. 3 is a sectional view taken along line BB in FIG. 1. The CC sectional view taken on the line of FIG. The rear view of the connection tool. The rear view of the state which connected the suspension line via the shackle to the suspension line connection part of the connection tool. The steel bar of the connector is shown, (a) is a side view, (b) is a front view. The synthetic resin molded product of the one side of the connector is shown, (a) is a side view, (b) is a front view. The side view of the state just before inserting the connection tool in the through-hole of a retaining wall block. The side view of the state which attached the connection tool to the through-hole of the retaining wall block.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main shaft part 2 Retaining mechanism 3 Suspension rope connection part 6 Steel bar material, main strength material 7 Synthetic resin molded product 8 Half round shaft shape part 9 Half bar shape part 11 Upper surface of steel bar center part, convex curved surface 12 Steel Bolt hole 13 in the central part of the rod 13 Grooves 14 and 15 in the half-round shaft shape part Upper and lower bolt holes 16 and 17 in the half-round shaft shape part Upper and lower bolts 18 in the main shaft part Half-round shaft shape part , Hollow portion 21 of main shaft portion, rod-shaped portion of retaining mechanism, front end portion 22 of steel bar 6 movable plate, disc 23 movable plate long hole 24 fixed plate, disc 25 bolt 31 main body of suspension rope connecting portion , Rear end 32 of steel bar 33 Connecting hole 33 Rope, rope 34, 35 Shackle 34 Shackle U-shaped body 35 Shackle pin 36 Shackle stop piece 37 Bolt B Retaining wall block, L-shaped concrete molded product H Retaining wall block Drain holes and through holes in the wall plate

Claims (4)

The main shaft part that fits sideways in the through-hole of the object to be lifted is a lifting connection tool provided with a retaining mechanism at the front end and a suspension cable connecting part at the rear end,
The main shaft has a synthetic resin molded product fixed to the center of the steel bar, the shaft center and upper or lower part are steel bars, and the left and right and lower or upper parts are made of synthetic resin. Composed of molded products,
The retaining mechanism comprises a rod-shaped part at the front end of the steel bar that protrudes to the front side of the main shaft, penetrates the movable plate to the steel rod front end of the rod-shaped part, fixes the fixed plate, and fixes the movable plate. It can be sandwiched between the plate and the main shaft and moved up and down.
When the connector is in the upside down posture, the movable plate does not protrude outward from the outer peripheral surface position of the main shaft portion, and is in a state of being pulled out and inserted, and when the connector is in the normal vertical posture, the movable plate is positioned at the outer peripheral surface position of the main shaft portion. It protrudes further downward and has a structure that prevents it from coming off,
The suspension rope connecting part is configured by a rear end portion of a steel bar projecting to the rear side of the main shaft part, and a connecting hole penetrating the steel bar rear end part of the main body in the left-right direction. Connecting tool.   2. The lifting connector according to claim 1, wherein the main shaft portion is provided with a hollow portion between the left and right side surfaces of the central portion of the steel bar and the inner surface of the synthetic resin molded product facing the main shaft portion.   3. The lifting connector according to claim 1 or 2, wherein the suspension cable connecting portion is provided with a plurality of connecting holes at intervals in the front-rear direction. The suspension cable connecting portion has a configuration in which a shackle is interposed to connect the suspension cable to the connection hole of the main body, and a shackle stopper piece is provided on the lower side of the main body,
When the connector is in a position to prevent it from coming off, the U-shaped body of the shackle is fitted into the main body from above, and the pin of the shackle can be inserted into the connecting hole of the main body and the pin hole of the U-shaped body,
The lifting connection tool according to claim 1, 2 or 3, wherein when the connecting tool is in a state of insertion / removal, the shackle stopper piece prevents the U-shaped body from being fitted into the main body from above.

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