JPH0791023B2 - Lifting device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a hoisting device applied when hoisting a heavy object such as a beam formwork of a building.

[Prior Art] In the conventional lifting device of this type, the hoisting device is hoisted by two cords whose base ends are respectively fastened to winch winding cylinders and front ends are respectively fastened to front and rear ends of a hoisting stand. The platform was lifted and the beams on the platform were suspended.

[Problems to be Solved by the Invention] In the above-mentioned hoisting device, a difference in the amount of elongation occurs between the two ropes, and the winding lengths when the two ropes are wound on the winch winding cylinder become unequal. In addition, there is a problem in that the winding forms are not uniform and the hoisting base moves up and down in a posture inclining forward or backward.

The present invention aims to solve the above problems.

[Means for Solving the Problems] A hoisting device of the present invention is a hoisting arm base formed in a laterally long shape at the upper end of a column that is erected on the tip of a base to which a winch body of a winch is attached. The ends are connected so as to be rotatable in the horizontal direction and tiltable in the vertical direction, and a part of the rope is formed from below so that a folding end is formed in a part of the rope of the winch in the suspension arm. A hooked upper pulley and a hook arranged at the front of the upper pulley and having the tip end of the rope attached thereto are attached, and the lifting table installed below the suspension arm is provided with the rope. Among them, a pair of lifting pulleys are attached, in which an intermediate portion between the tip end portion and the folding end is hooked in a folded shape from above, and the lifting platform is suspended and supported by the rope.
The suspension arm has a structure in which a suspension arm connecting mechanism for connecting and fixing the suspension arm to a steel frame of a building under construction is attached near the central portion of the suspension arm.

(Operation) In the hoisting device having the above-mentioned configuration, the rope of the winch is hooked to the upper pulley at the folded end of the rope, and the tip of the rope is connected to the hook, and folded back with the tip of the rope. An intermediate part between the end is hung on both hoisting pulleys of the hoisting platform, and the hoisting platform is suspended while the suspension arm is fixed to the steel frame of the building under construction by the suspension arm connecting mechanism.

(Effects of the Invention) With the present invention configured as described above, both lifting and lowering pulleys are pushed up and down by the ropes while sliding on the ropes when lifting a heavy object on the hoisting platform. Since the regulation action that holds the pulleys at the same horizontal level works, the lifting platform can be automatically held in the horizontal state and moved upward in parallel, and the lifting posture of the lifting platform can always be optimized.

Also, since the hoisting platform is lifted and lowered by one rope,
The guide mechanism of the rope can be simplified and the required length of the rope can be shortened.

Furthermore, since the suspension arm can be fixed to the steel frame of the building under construction, the suspension arm can be stably supported by the steel frame to stabilize the suspension support state of the hoist, and the suspension arm can be rotated horizontally. By tilting and tilting, the height and angle of the suspension arm can be changed and the suspension arm can be accurately connected to the steel frame.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings.

In a hoisting device T installed for hoisting a heavy object H such as a beam formwork during the construction of a building, a base 1 has a rectangular frame-shaped front frame 1a and a rectangular frame-shaped rear frame 1b. , A horizontal connecting rod 1c for connecting both frames 1a, 1b is assembled and formed, and a base 1 is provided at the left and right ends of the front and rear frames 1a, 1b.
A pair of left and right wheels 2 are mounted for traveling the vehicle.

A winch body 4 of a winch 3 having a winch body 4 and a cord 5 having a base end portion connected to a winding drum 4a of the winch body 4 is installed on the center portion of the rear frame 1b, while
Bracket 6 attached to the upper surface near the front end of the connecting rod 1c
In order to guide a part of the rope 5 wound around the winding drum 4a of the winch body 4 at the tip of the winch body 4 and bend the rope 5 upward from the winch body 4 side or from the winch body 4 side. A lower pulley 7 on which a part of 5 is hung is rotatably and axially movably supported by a support shaft 7a which is horizontally inserted through a bracket 6.

On the tip of the base 1, an upper column 9a and a lower column 9b of round pipe material are provided.
A columnar base 10a, which is loosely inserted into a rectangular tubular holding member 22 attached to the center of the front end of the front frame 1a, is formed by a pillar 9 formed by extensiblely connecting and. Up and down via a jack 10 having a bolt 10b having a lower end fixed to 10a and an upper part inserted into the lower end of the column 9 and an operation nut 10c screwed to the bolt 10b with the column 9 supported. It is erected so that the movement in the direction can be adjusted.

A washer 27 having an upper surface curved in a spherical shape is fixed to the upper end of the upper column 9a of the column 9, and a locking pin 28 inserted through the center of the washer 27 is fixed.

A suspension arm 12 formed of a square pipe material and extending toward the end of the support column 9 is provided at the upper end of the support column 9, and an upper portion of a locking pin 28 is inserted into the base end portion of the suspension arm 12 and is placed on a washer 27. The suspension arm 12 is locked so that it can be rotated in the horizontal direction and tilted in the vertical direction in a state where the base end portion of the suspension arm 12 is placed.

In the suspension arm connection mechanism that connects the suspension arm 12 to the steel frame T of the building under construction, the left and right ends are located above the central portion of the suspension arm 12.
A pair of front and rear suspension plates 23 projecting outwardly of 12 are placed in parallel, and suspension arms 12 are horizontally installed on the left and right ends of both suspension plates 23 for each floor of the building under construction. The upper ends of the two pairs of front and rear connecting bolts 24 hung on both sides of the suspension arm 12 for orthogonally fixing to the existing steel frame T are respectively inserted, and the connecting bolts 24
Is suspended and supported by a suspension plate 23 via nuts 25 screwed onto the respective upper ends thereof. Locking claws 24a for locking the upper side edge T1 of the steel frame T are formed at the lower ends of the connecting bolts 24, respectively. Between the suspension arm 12 and the steel frame, a support plate 26a is attached to the lower surface of the suspension arm 12 in parallel with the suspension plate 23, and a pair of left and right vertically secured to the left and right ends of the support plate 26a. A pair of front and rear interposing members 26, each of which has a cylindrical rod 26b and connecting plates 26c whose left and right ends are fixed to the cylindrical rods 26b, respectively, are provided to connect the cylindrical rods 26b. . When the nuts 25 are screwed with the lower portions of the connecting bolts 24 inserted into the cylindrical rods 26b and the hooks 24a hooked on both side edges T1 of the steel frame T, the interposition members 26 are hung. The suspension arm 12 is clamped between the steel frame T and the steel frame T, and the suspension arm 12 is fixed to the steel frame T at an upper position above the steel frame T in an orthogonal manner.

In order to form a folded-back end 5b in a part of the rope 5 by guiding a part of the rope 5 in the vicinity of the upper end of the support column 9 in the base end portion of the suspension arm 12 and bending it downward. A pair of front and rear upper pulleys 13, 13 arranged in the vicinity of the upper end of the column 9 and having a part of the rope 6 hung from the bottom in a folded shape, and horizontally inserted into the suspension arm 12 Each of them is rotatably supported via 13a. Both upper pulleys 13 are fitted to both support shafts 13a in a state of being displaced to a position close to one side wall 12a of the suspension arm 12, and both support shafts 13a regulate the movement of the upper pulleys 13 in the axial direction. The pin 29 for is inserted.

At the tip of the suspension arm 12, a hook 15 which is arranged diagonally forward of the upper pulley 13 and to which the tip 5a of the rope 5 is screwed is inserted horizontally into the support pin 16 at the tip of the suspension arm 12. It is suspended through. The hook 15 has a hook-shaped hooking portion 15a for hooking a loop formed on the tip portion 5a of the cord 5, and the hooking portion 1
A ring-shaped mounting portion 15b which is continuously provided above 5a and through which the support pin 16 is inserted, and a retaining piece which is pinned to the upper end of the hooking portion 15a to prevent the distal end portion 5a of the cord 5 from coming off. 15c is formed, and the hook 15 is suspended and supported at the tip end of the suspension arm 12 in a state of being displaced to a position close to the side wall 12b on the opposite side of the displacement direction side of both upper pulleys 13.

Below the suspension arm 12, a hoisting base adjacent to the front side of the base 1 for placing a heavy object H such as a beam form frame to be hoisted along the support column 9 from the lower end position of the base 1 forward. 17 is installed horizontally, the base 18 of the lifting platform 17 is formed in a rectangular frame shape by the front and rear frame rods 18a, 18a and the left and right frame rods 18b, 18b, and in the front-back direction near the center of the base 18. On the other hand, an angled pipe-shaped middle frame rod 18c is formed obliquely bridged between the front and rear frame rods 18a in a state of being inclined in the lateral direction.

At the front and rear ends near the center of the hoist 17 in the width direction, the center of the hoist 17 in the width direction may be suspended by the rope 5 at two positions separated in the front-rear direction and the left-right direction. A pair of hoisting pulleys 19 and 19 are attached, in which the intermediate portion between the tip end 5a and the folded end 5b of the cord 5 crosses the hoisting base 17 diagonally and is hung in a folded shape. Both lifting pulleys 19 are respectively connected to the middle frame rods 18c through the support shafts 19a which are horizontally inserted at the front and rear ends of the middle frame rods 18c of the base 18.
It is rotatably laterally installed inclining in the same direction as the tilting direction, and covers 22 are removably installed below both lift pulleys 19.

The both elevating sheaves 19 are disposed below the folded-back end 5b of the rope 5 and below the tip 5a, respectively, and the arrangement directions of the both elevating sheaves 19 substantially coincide with the arrangement direction of the upper sheave 13 and the hooks 15. There is.

On the bracket 21 attached to the lower surface of the central portion of the middle frame rod 18c of the base 18 of the hoisting base 17, the bending angle of the rope 5 is enlarged at the position where the rope 5 comes into contact with both the elevating sheaves 19. Auxiliary sheaves 20 arranged below the middle portion of the two elevating sheaves 19 in order to smoothly bend the strip 5 at the contact portion with the both elevating sheaves 19.
Is rotatably supported by a support shaft 20a inserted through a bracket 21, and the rope 5 is hooked on both the elevating sheaves 19 and the auxiliary sheaves 20 in an inverted mountain shape. At the lower end of the bracket 21, a retaining piece 21a for retaining the cord 5 in the guide groove of the auxiliary pulley 20 is formed.

The rope 5 has its tip portion 5a connected to the tip portion of the suspension arm 12, is folded back below the suspension arm 12 by both the elevating sheaves 19 and the auxiliary sheaves 20, and both upper sheaves 13 near the upper ends of the columns 9. Is folded back downward by the lower pulley 7, and is further folded near the tip of the base 1 by the lower pulley 7 toward the winch body 4 side of the winch 3, and is hung on the pulleys 19, 20, 13, 7 to winch body 4 Wound up by.

When the rope 5 is wound around the winding drum 4a of the winch body 4 or unwound from the winding drum 4a, the lifting platform 17 has a length of 1/2 of the wound length or the unwound length of the rope 5. Translate up and down by a distance.

When the heavy object H is placed on the hoist 17 and hoisted, ropes or the like are connected to both ends of the heavy object H in the longitudinal direction, and the operator operates the rope or the like to operate the heavy object H. The lifting table 17 is raised while keeping the horizontal position.

Next, the operation and effect of the embodiment having the above-mentioned configuration will be described.

In this example, the base end of a horizontally extending suspension arm 12 is horizontally rotated at the upper end of a column 9 standing on the tip of a base 1 to which a winch body 4 of a winch 3 is attached. And the slant arm 12 so as to be tiltable in the vertical direction, and the rope 5 is formed on the suspension arm 12 so that the folded-back end 5b is formed on a part of the rope 5 of the winch 3.
Part of the upper pulley 13 is hung from below, and this upper pulley 13
And a hook 15 to which the tip 5a of the rope 5 is attached and which is arranged in front of the
In the rope 5, a pair of lifting sheaves in which an intermediate portion of the leading end 5a and the folded end 5b of the cord 5 is hooked in a folded shape from above.
19 is attached, and the hoisting base 17 is suspended by the rope 5,
A suspension arm connecting mechanism for connecting and fixing the suspension arm 12 to the steel frame T of the building under construction is attached near the central portion of 12.

Therefore, when the heavy object H on the hoisting base 17 is hoisted, the both hoisting sheaves 19 are held at the same horizontal level with respect to the both hoisting sheaves 19 that are pushed up by the hoisting rope 5 while being slid on the rope 5. Since the regulation action works, the lifting table 17 can be automatically held in the horizontal state and moved upward in parallel, and the lifting posture of the lifting table 17 can always be optimized.

Further, since the hoisting base 17 is moved up and down by one rope 5, the guide mechanism for the rope 5 can be simplified and the rope 5
The required length of can be shortened.

Further, since the suspension arm 12 can be fixed to the steel frame T of the building under construction, it is possible to stabilize the suspension state of the hoisting platform 17 that stably supports the suspension arm 12 by the steel frame T, and to suspend the suspension. By horizontally rotating and tilting the arm 12, the height and angle of the suspension arm 12 can be changed and the suspension arm 12 can be accurately connected to the steel frame T.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is a side view of a hoisting device, FIG. 2 is a vertical cross-sectional view of the vicinity of the tip of a base,
Fig. 3 is a view taken along the line X1-X1 in Fig. 2, Fig. 4 is a partially cutaway enlarged side view near the suspension arm, Fig. 5 is a sectional view taken along line X2-X2 in Fig. 4, and Fig. 6 is Fig. 4 is a view taken along the line X3-X3 in Fig. 4, Fig. 7 is a rear view of the hoist, and Fig. 8 is an enlarged sectional view taken along line X4-X4 of Fig. 7. 1 ...... Base 4 ...... Winch body 5 ...... Rope 5a ...... Tip part 5b ...... Folding end 9 ...... Strut 12 ...... Suspension arm 13 ...... Upper pulley 17 ...... Lifting platform 19 ...... Lifting pulley T ...... Lifting device

Claims (1)

[Claims] 1. A horizontally extending base end portion of a horizontally extending suspension arm is provided at the upper end of a column standing on the tip end portion of a base on which a winch body of a winch is mounted. And an upper pulley on which a part of the rope is hooked from below so that a folding end is formed on a part of the rope of the winch. And a hook to which the tip end of the cord is locked is attached to the front of the cord, and a lifting table installed below the suspension arm is provided with an intermediate portion between the tip end and the folded end of the cord. A pair of hoisting pulleys whose parts are folded from above are attached to suspend the hoisting platform by the ropes, and the hoisting arm is constructed near the center of the hoisting arm of a building under construction. A hoisting device having a hanging arm connecting mechanism for connecting and fixing to a steel frame.