JP5739491B2 - Floor crane - Google Patents

Description

  The present invention relates to a floor crane in which a load is suspended at an arbitrary position on a floor, and more particularly to a floor crane suitable for use in a beam hanging operation in a building.

  In recent years, with the mechanization of building work, floor cranes that perform crane work such as entering a building and hanging beam frames are being introduced. An example of this type of crane is proposed in Patent Document 1.

Japanese Patent Laid-Open No. 7-89696

  The crane according to Patent Document 1 is configured such that a support base is turnably installed on a vehicle body, and a multi-stage telescopic boom that hangs a load on the support base is attached in a vertically movable manner.

However, in the crane according to Patent Document 1, if the load is to be lifted high, the multistage telescopic boom is extended and raised as much as possible. There is a problem that the working radius of handling becomes small.
In addition, the crane has a problem that if a predetermined working radius is to be secured, the multistage telescopic boom will be prone, so that the lift cannot be secured high.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a floor crane capable of realizing a high lift while ensuring a predetermined working radius.

In order to achieve the above object, a floor crane according to the present invention comprises:
Comprising a movable carriage on the floor, on a revolving frame provided pivotably relative to said carriage, and installing a retractable telescoping mast in the vertical direction, freely undulating jib hanging a load on top of the telescoping mast in mounted ing floor crane,
The telescopic mast is a side for storing a plurality of hollow mast members having different opening sizes in order of the opening size, and storing the mast member when the telescopic mast is in an extended state. A lock pin that is inserted so as to connect the retractable mast member to the retractable mast member that is to be stored is provided, and an operation rod that transmits an operation force for inserting / removing the lock pin to the lock pin is provided The operation rod is disposed along the telescopic mast, and the operation rod can be expanded and contracted according to the expansion and contraction of the telescopic mast (first invention).

In the present invention, the sheave is disposed on the tip portion of the price paid mast member, wound around and said sheave, said wire rope between the base end portion of the storage mast member, the object store for the storage mast member The telescopic mast is preferably extended or contracted by an ascending operation or descending operation of the mast member by the wire rope (second invention).

  In the present invention, it is preferable that a fall prevention device is provided for preventing the stored mast member from dropping with respect to the stored mast member when the tension of the wire rope disappears (third invention).

  In the present invention, the fall prevention device has an inclined receiving surface whose distance from the side surface of the to-be-stored mast member becomes shorter as it goes downward, and the inclined receiving surface faces the side surface of the to-be-stored mast member. The receiving mast includes a receiving member attached to the storage mast member, and the brake body is in contact with the inclined receiving surface of the receiving member while the brake body is in contact between the inclined receiving surface of the receiving member and the side surface of the receiving mast member. The wire rope and the brake are movably disposed between a non-braking position that does not contact the side surface of the member and a braking position that simultaneously contacts the inclined receiving surface of the receiving member and the side surface of the stored mast member. When the wire rope is tensioned, the link mechanism disposed between the body and the body keeps the brake body in the non-braking position while the wire rope is tightened. Preferably, when a force is lost is configured to move to the braking position the braking body (fourth aspect of the invention).

In the present invention, the jib is divided into a front jib and a rear jib, and the front jib and the rear jib are joined by a hinge mechanism so that the front jib and the rear jib are arranged in a straight line. A state where the front jib is bent with respect to the rear jib, and a first sheave for raising and lowering is rotatably arranged on the telescopic mast side, and the front jib is raised and lowered. A second sheave for rotation is rotatably arranged, and a wire rope from a hoisting winch for hoisting the jib is hung on the first sheave for raising and lowering and the second sheave for raising and lowering. By the operation, the jib is brought into a straight state, and when the hoisting winch is continuously wound, the jib is raised, and the jib is prone by the extending operation of the hoisting winch, and further the hoisting winch Continued feeding operation, preferably the jib is a center bending state (fifth invention).

According to the present invention, the telescopic mast is installed on the carriage via the revolving frame, and the jib is attached to the upper part of the telescopic mast so that it can be raised and lowered, so that the telescopic mast is extended in the vertical direction and the jib is raised and lowered. Thus, the crane work is performed at a high lift according to the jib undulation position and the extension length of the telescopic mast within a predetermined working radius determined by the jib length and the jib undulation position with respect to the turning center of the swivel frame. be able to. Therefore, it is possible to realize a high head while ensuring a predetermined working radius. In the present invention, when the telescopic mast is in the extended state, the lock pin is inserted so as to connect the retracted mast member and the retracted mast member, so that the stretched state of the telescopic mast can be reliably maintained. . Further, since the operating force for inserting / removing the lock pin provided at each step of the telescopic mast is transmitted via the operation rod, the lock pin provided at each step of the telescopic mast is inserted / removed by operating the operation rod. Operation can be performed easily.

By the way, with regard to the expansion / contraction structure of the expansion / contraction mast, for example, when an actuator such as a hydraulic cylinder is incorporated in the expansion / contraction mast and expansion / contraction of the expansion / contraction mast is achieved by expansion / contraction operation of the hydraulic cylinder, the length of the mast member is This is greatly limited by the specifications of the hydraulic cylinder, such as being unable to be shorter than the length required for assembling.
In order to make the lift higher, it is necessary to adopt a hydraulic cylinder with a larger extension, but in this case the overall length of the hydraulic cylinder becomes longer, so the height of the floor crane when the telescopic mast contracts is larger. Thus, it becomes difficult for the floor crane to pass under the beam, for example.
In order to reduce the height of the floor crane, it can be achieved by using a hydraulic cylinder with a short overall length when contracted, but in this case, the extension amount of the hydraulic cylinder cannot be taken too long. It becomes difficult to raise the head.

Therefore, the adoption of the configuration of the second invention, i.e., of the side that stores a storage mast member in the mast member tip sheave disposed on, and the sheave, which is the side to be stored in the storage mast member A mast member that extends or contracts the telescopic mast by a wire rope hung between the base end portion and the retracted mast member with respect to the retractable mast member by the ascending or descending operation of the retracted mast member. The height dimension of the floor crane can be made compact by reducing the length dimension of the floor crane as much as possible, and the lift can be made higher by increasing the number of steps of the mast member.

  According to the third invention, when the tension of the wire rope disappears, the fall prevention device is provided to prevent the fallen mast member from dropping relative to the containment mast member. Even if the wire rope related to the expansion and contraction of the expansion / contraction mast is cut, the contraction of the expansion / contraction mast due to the gravity action can be prevented by the fall prevention device.

  According to the fourth invention, when the tension of the wire rope disappears, the brake body is moved to the braking position, and the brake body is retracted while simultaneously contacting the inclined receiving surface of the receiving member and the side surface of the stored mast member. When the mast member is lowered as much as possible, the passage between the inclined receiving surface of the receiving member and the side surface of the stored mast member becomes narrower as it goes downward, so the brake body is inclined to the inclined receiving surface of the receiving member and the stored mast member. Since the mutual frictional force is increased by being strongly sandwiched by the side surfaces of the storage mast, it is possible to mechanically prevent the stored mast member from dropping with respect to the storage mast member.

According to the fifth aspect , since the jib can be bent, the jib can be made more compact when not in use, and the floor crane can be transferred more easily.

It is a side view showing the use condition of the floor crane concerning one embodiment of the present invention. It is a side view showing the non-use state of the floor crane It is a top view showing the use condition of the floor crane. It is a front view of a mast, (a) is an expansion state figure, (b) is a contraction state figure. It is one side view of a mast, (a) is an expansion state figure, (b) is a contraction state figure. It is the other side view of a mast, (a) is an expansion | extension state figure, (b) is a shrinkage | contraction state figure, (c) is the A section enlarged view of (a). It is structure explanatory drawing of the winch side fall prevention apparatus, (a) is the figure seen from the front side of the mast, (b) is C arrow directional view of (a). It is operation | movement explanatory drawing of a winch side fall prevention apparatus, (a) is a state figure in case the tension | tensile_strength of a wire rope exists, (b) It is a state figure in case the tension | tensile_strength of a wire rope lose | disappears. It is structure explanatory drawing of a tail side fall prevention apparatus, (a) is the figure seen from the front side of the mast, (b) is a D arrow line view of (a). It is operation | movement explanatory drawing of a tail side fall prevention apparatus, (a) is a state figure when the tension | tensile_strength of a wire rope exists, (b) It is a state figure when the tension | tensile_strength of a wire rope lose | disappears. FIG. 7 is a cross-sectional view taken along line B-B in FIG. 6, where (a) is a lock state diagram of the telescopic lock device, and (b) is a lock release state diagram of the device.

  Next, specific embodiments of the floor crane according to the present invention will be described with reference to the drawings.

<Overview of floor crane>
A floor crane 1 shown in FIG. 1 performs a crane operation of hanging a load such as a beam frame at an arbitrary position on a floor 2 in a building, and includes a carriage 3 that is movable on the floor 2. Yes.

A steering bar 5 for operating the steered wheels 4 is attached to the carriage 3, and the traveling direction of the carriage 3 is changed by the operation of the steering bar 5 to easily move the floor crane 1 to an arbitrary position on the floor 2. Be able to.
In addition, a manual outrigger 7 equipped with a screw-type jack 6 is assembled to the carriage 3 so as to be able to extend and retract in the lateral direction at the front, rear, left and right parts. By extending these outriggers 7 in the lateral direction of the carriage 3 and lifting the carriage 3 with the jacks 6, the crane work by the floor crane 1 can be stably performed.

On the carriage 3, a turning frame 9 is installed so as to be turnable with respect to the carriage 3 via a turning device 8.
On the revolving frame 9, an extendable mast 10 is installed so as to be extendable in the vertical direction so as to be positioned at the center of the turn. A jib 11 for hanging a load is attached to the upper portion of the telescopic mast 10 via pins 12 so as to be raised and lowered.
On the lower surface side of the turning frame 9, a counterweight 13 is detachably attached at a rearmost position at a predetermined distance from the turning center portion.
A frame 14 is installed on the revolving frame 9 between the telescopic mast 10 and the counterweight 13, and a cargo handling winch 15 and a hoisting winch 16 are assembled to the frame 14 respectively.
Reference numeral 17 denotes a cable reel for winding or unwinding a cable connected to an electronic device such as a sensor (not shown) disposed around the jib 11 according to the expansion / contraction operation of the expansion / contraction mast 10. It is.

A first sheave 21 for cargo handling is rotatably attached to the upper portion of the telescopic mast 10 via a bracket 20.
A second sheave 22 for cargo handling is rotatably attached to the tip of the jib 11.
The wire rope 23 wound around the winding drum of the cargo handling winch 15 is hung around the sheave of the hook block 24 via the first cargo handling sheave 21 and the second cargo handling sheave 22 and passes through the reverse route to the tip. The part is fixed to the gantry frame 14 via the load cell 25, and the lifting or lowering operation of the load hung on the hook 24 a of the hook block 24 can be performed by the winding or unwinding operation of the loading winch 15. It is like that.

  Thus, in the floor crane 1, the telescopic mast 10 is extended in the vertical direction and the jib 11 is raised and lowered, so that the length of the jib 11 and the raising and lowering position of the jib 11 are determined based on the turning center of the turning frame 9. Within a predetermined work radius, the crane work can be performed with a high head according to the undulation position of the jib 11 and the extension length of the telescopic mast 10.

<Description of swivel device>
The swivel device 8 includes a ring gear portion (not shown) fixed to the cart 3 side, and a bearing portion (not shown) that supports the swivel frame 9 so as to be turnable relative to the ring gear portion, and is fixed to the swivel frame 9 side. The turning power of the turning motor 26 (see FIG. 3) is transmitted to the ring gear portion via a pinion gear (not shown), so that the turning frame 9 is turned with respect to the carriage 3.

<Explanation of telescopic mast>
As shown in FIG. 4A, the telescopic mast 10 includes a lower mast member 30, a first intermediate mast member 31, a second intermediate mast member 32, and an upper mast member 33, respectively. These mast members 30 to 33 are each formed of a rectangular tubular member having a hollow portion and opened in the vertical direction, and the opening of the lower mast member 30 is the largest, and the first intermediate mast member 31 and the second intermediate mast member The size of the opening gradually decreases in the order of the mast member 32 and the upper mast member 33.
In the telescopic mast 10, the first intermediate mast member 31 is in the lower mast member 30, the second intermediate mast member 32 is in the first intermediate mast member 31, and the upper mast member is in the second intermediate mast member 32. 33 can be stored in the sliding contact state.

Of the lower mast member 30 and the first intermediate mast member 31, the lower mast member 30 is the “stored mast member” of the present invention, and the first intermediate mast member 31 is the “stored mast member” of the present invention. .
Similarly, in the first intermediate mast member 31 and the second intermediate mast member 32, the first intermediate mast member 31 is the “stored mast member” of the present invention, and the second intermediate mast member 32 is the “stored mast member” of the present invention. A mast member.
Similarly, in the second intermediate mast member 32 and the upper mast member 33, the second intermediate mast member 32 is the “stored mast member” of the present invention, and the upper mast member 33 is the “stored mast member” of the present invention. is there.

<Explanation of telescopic device for telescopic mast>
In the lower mast member 30, the first intermediate mast member 31 and the second intermediate mast member 32, brackets 34 are provided on the upper end portions of the mast members 30 to 32 so as to protrude on both sides. A sheave 35 is rotatably attached.

A pair of sheaves 36 are rotatably attached to the proximal end portion of the first intermediate mast member 31 so as to be arranged on both sides.
An expansion / contraction winch 37 is attached to one side surface of the lower mast member 30. A winch side fall prevention device 38 is attached to one side surface of the lower mast member 30 so as to be located between the telescopic winch 37 and the sheave 35 disposed on one side of the upper end portion of the lower mast member 30. ing.
On the other side surface of the lower mast member 30, a tail side fall prevention device 39 is attached so as to be symmetrical with the winch side fall prevention device 38.

The wire rope 40 wound around the winding drum of the telescopic winch 37 includes a winch side fall prevention device 38, a sheave 35 disposed on one side of the upper end portion of the lower mast member 30, and a first intermediate mast member 31. The tip part of the sheave 36 is disposed around the lower end of the lower mast member 30 via the pair of sheaves 36 and the sheave 35 provided on the other side of the upper end of the lower mast member 30. The lower mast member 30 is fixed to the other side surface.
When the hoisting operation of the wire rope 40 by the telescopic winch 37 is performed, the first intermediate mast member 31 is raised with respect to the lower mast member 30 by the raising operation by the wire rope 40, and the wire by the telescopic winch 37 is moved. When the feeding operation of the rope 40 is performed, the first intermediate mast member 31 is lowered with respect to the lower mast member 30 by the lowering operation by the wire rope 40.

  The brackets 34 on both sides of the upper end portion of the lower mast member 30 and both side surfaces of the proximal end portion of the second intermediate mast member 32 are hooked on sheaves 35 disposed on both sides of the upper end portion of the first intermediate mast member 31. When the first intermediate mast member 31 rises with respect to the lower mast member 30, the first intermediate mast 41 is pushed up by the sheave 35 to be connected to the first intermediate mast 41. When the second intermediate mast member 32 is raised with respect to the mast member 31 and the first intermediate mast member 31 is lowered with respect to the lower mast member 30, the wire rope 41 lowered from the sheave 35 is lowered by the lowering operation. The second intermediate mast member 32 is lowered relative to the first intermediate mast member 31.

  Further, the brackets 34 on both sides at the upper end portion of the first intermediate mast member 31 and the both side surfaces at the proximal end portion of the upper mast member 33 are sheaves 35 disposed on both sides of the upper end portion of the second intermediate mast member 32. When the second intermediate mast member 32 rises with respect to the first intermediate mast member 31, the wire rope 42 is pushed up by the sheave 35 to raise the wire rope 42. When the upper mast member 33 is raised relative to the second intermediate mast member 32 and the second intermediate mast member 32 is lowered relative to the first intermediate mast member 31, the wire rope 42 lowered from the sheave 35 is lowered. By operation, the upper mast member 33 is lowered with respect to the second intermediate mast member 32.

In short, when the winding operation of the wire rope 40 by the expansion / contraction winch 37 is performed, the first intermediate mast member 31 rises with respect to the lower mast member 30, and in conjunction with this, the second intermediate mast is moved by the wire rope 41. The member 32 is raised with respect to the first intermediate mast member 31, and the upper mast member 33 is raised with respect to the second intermediate mast member 32 by the wire rope 42 so that the telescopic mast 10 is extended.
On the other hand, when the wire rope 40 is fed out by the telescopic winch 37, the first intermediate mast member 31 descends with respect to the lower mast member 30, and the second intermediate mast member is moved by the wire rope 41 in conjunction therewith. 32 is lowered with respect to the first intermediate mast member 31, and the upper mast member 33 is lowered with respect to the second intermediate mast member 32 by the wire rope 42 so that the telescopic mast 10 is contracted.

<Description of winch side fall prevention device>
As shown in FIGS. 7A and 7B, the winch side fall prevention device 38 includes a main body frame 50 fixed to one side surface 30 a of the lower mast member 30.
The body frame 50 is provided with a receiving member 51. The receiving member 51 has an inclined receiving surface 51a whose distance from the one side surface 31a of the first intermediate mast member 31 becomes shorter as it goes downward, and the inclined receiving surface 51a is one side surface 31a of the first intermediate mast member 31. To face each other.
A brake body 52 is disposed between the inclined receiving surface 51 a of the receiving member 51 and one side surface 31 a of the first intermediate mast member 31. The brake body 52 has a roller shape that is rotatably supported by a support shaft 53. The outer circumferential surface of the brake body 52 is provided with a number of irregularities that are continuous in a wavy shape throughout the circumferential direction, thereby increasing the friction coefficient.
Both ends of the support shaft 53 of the brake body 52 are fitted in slits 54 of a bracket provided on the main body frame 50. The slit 54 is inclined so as to approach the one side surface 31a of the first intermediate mast member 31 as it proceeds downward.

  As shown in FIG. 8A, when the support shaft 53 is disposed at the upper position of the slit 54, the brake body 52 is in contact with the inclined receiving surface 51 a of the receiving member 51 while being the first intermediate mast member. 31 is arranged at a position where it does not come into contact with one side surface 31a (hereinafter referred to as “non-braking position”), and as shown in FIG. When the brake body 52 is disposed at a position that is lowered, the brake body 52 simultaneously contacts the inclined receiving surface 51a of the receiving member 51 and the one side surface 31a of the first intermediate mast member 31 (hereinafter referred to as “braking position”). The brake body 52 is movable between the non-braking position and the braking position while always in contact with the inclined receiving surface 51a of the receiving member 51.

A link mechanism 55 is disposed between the wire rope 40 and the brake body 52.
The link mechanism 55 includes a first link body 55a extending in the vertical direction and a second link body 55b extending in the horizontal direction.
The first link body 55 a is supported by the main body frame 50 through a pin 56 at an intermediate portion near the lower portion, and is rotatable around the pin 56.
Necessary (three in this example) rollers 57, 58, and 59 are arranged above the first link body 55a so as to sandwich the wire rope 40 therebetween.
One end of the second link body 55b is connected to the lower part of the first link body 55a via a pin 60.
The other end portion of the second link body 55b is configured to support the support shaft 53 of the brake body 52.

  In the winch side fall prevention device 38, as shown in FIG. 8 (a), when the wire rope 40 is tensioned, the wire rope 40 is sandwiched between the three rollers 57, 58, 59 to form the first link. The state in which the body 55a stands up and down is maintained, whereby the brake body 52 is held in the non-braking position via the second link body 55b.

On the other hand, as shown in FIG. 8B, when the tension of the wire rope 40 is lost due to the wire rope 40 being cut or the like, the wire rope 40 cannot be sandwiched between the three rollers 57, 58, and 59. The first link body 55a is rotated so as to fall around the pin 60 in the direction away from the one side surface 30a of the lower mast member 30, whereby the second link body 55 b is turned to the one side surface 31 a of the first intermediate mast member 31. Will be pushed towards.
When the second link body 55b is pushed toward the one side surface 31a of the first intermediate mast member 31, the support shaft 53 of the brake body 52 is pushed down obliquely downward along the slit 54, whereby the brake body 52 is moved to the braking position. And is pressed against one side 31a of the first intermediate mast member 31 while being in contact with the inclined receiving surface 51a of the receiving member 51.
When the brake body 52 is brought into contact with the inclined receiving surface 51a of the receiving member 51 and one side surface 31a of the first intermediate mast member 31 at the same time and is lowered together with the first intermediate mast member 31, the inclined receiving surface of the receiving member 51 is lowered. Since the passage between 51a and one side surface 31a of the first intermediate mast member 31 is narrowed downward, the brake body 52 is inclined to the receiving surface 51a of the receiving member 51 and one side surface 31a of the first intermediate mast member 31. And the frictional force between the brakes 52 increases, and the brake body 52 rotates around the support shaft 53 as the first intermediate mast member 31 is slightly lowered. 52 enters a deeper position between the inclined receiving surface 51a of the receiving member 51 and the one side surface 31a of the first intermediate mast member 31, so that the mutual frictional force is further increased. A first intermediate mast member 31 relative to the lower mast member 30 from falling can be mechanically reliably prevented by the brake member 52.

<Explanation of the trailing side fall prevention device>
As shown in FIGS. 9 (a) and 9 (b), the tail side fall prevention device 39 is attached to the other side surface 30b of the lower mast member 30 so as to be symmetrical with the winch side fall prevention device 38 described above. The fall prevention device has many structural parts in common with the winch side fall prevention device 38. Therefore, the parts common to the winch side fall prevention device 38 are given the same reference numerals and the detailed explanation thereof is omitted, and the following description will focus on differences from the winch side fall prevention device 38. I will do it.

In the tail side fall prevention device 39, a link mechanism 65 is disposed between the tip of the wire rope 40 and the brake body 52.
The link mechanism 65 includes a first link body 65a extending in the vertical direction and a second link body 65b extending in the horizontal direction.
A long hole 66 is provided in the middle portion of the first link body 65a in the vertical direction, and a pin 67 inserted into the long hole 66 is supported by the main body frame 50. By the guiding action of the long hole 66 and the pin 67, The first link body 65a is movable in the vertical direction.
The upper end portion of the first link body 65 a is connected to the distal end portion of the wire rope 40 via the pin 68.

  10 (a), when the wire rope 40 has a tension, the lower end of the long hole 66 provided in the first link body 65a is lifted up to a position where it hits the pin 67. Thus, the brake body 52 is held at the non-braking position via the second link body 65b.

On the other hand, as shown in FIG. 10B, when the tension force disappears due to the wire rope 40 being cut or the like, the upper portion of the long hole 66 provided in the first link body 65a reaches the position where it hits the pin 67. The first link body 65a is dropped by the gravity action.
Due to the fall of the first link body 65a, the support shaft 53 of the brake body 52 is pushed down obliquely downward along the slit 54 via the second link body 65b, whereby the brake body 52 is arranged at the braking position and is a receiving member. The first intermediate mast member 31 is pressed against the other side surface 31b while being in contact with the inclined receiving surface 51a.
When the brake body 52 is lowered at the same time with the first intermediate mast member 31 while simultaneously contacting the inclined receiving surface 51a of the receiving member 51 and the other side surface 31b of the first intermediate mast member 31, as described above, the brake body 52 is strongly sandwiched between the inclined receiving surface 51 a of the receiving member 51 and the other side surface 31 b of the first intermediate mast member 31, and the mutual frictional force increases, so that the first intermediate mast member 31 is against the lower mast member 30. Can be mechanically prevented from falling.

<Explanation of telescopic lock device>
As shown in FIG. 5A, the boundary between the lower mast member 30 and the first intermediate mast member 31 and the first intermediate mast member 31 and the second intermediate mast member 32 when the telescopic mast 10 is extended. Expansion / contraction locking devices 70a, 70b, 70c for stopping expansion / contraction between the masts are disposed at the boundary portion and the boundary portion between the second intermediate mast member 32 and the upper mast member 33, respectively.
As a representative, the telescopic lock device 70a provided at the boundary between the lower mast member 30 and the first intermediate mast member 31 will be described below, and the other telescopic lock devices 70b and 70c have been described with this description. Shall.

As shown in FIG. 11 (a), the telescopic lock device 70a reciprocates in the insertion / removal direction at the upper end of the lower mast member 30 on both sides of the bracket 34 on both sides described above at a position shifted by 90 ° in plan view. A lock pin 71 is provided that is movably fitted.
A lock pin insertion hole 72 into which the lock pin 71 can be inserted corresponding to the lock pin 71 when the telescopic mast 10 is in the extended state is provided below the first intermediate mast member 31.

As shown in FIG. 5A, the telescopic mast 10 is provided with an operation rod 73 for transmitting an operation force for inserting and removing the lock pin 71 to the lock pin 71.
The operating rod 73 includes a first split operating rod 73a, a second split operating rod 73b, and a vertically split corresponding to each of the lower mast member 30, the first intermediate mast member 31, and the second intermediate mast member 32. A third split operation rod 73c is provided. Each of these split operation rods 73a to 73c is formed of a rectangular tubular member, the opening of the first split operation rod 73a is the largest, and the size of the opening in order of the second split operation rod 73b and the third split operation rod 73c. Is getting smaller.
The operation rod 73 is configured by storing the second divided operation rod 73b in the first divided operation rod 73a and the third divided operation rod 73c in the second divided operation rod 73b in a sliding contact state. The split operation rods 73a to 73c are integrated with each other at a predetermined distance from the lock pin 71 so as to be rotatable about its axis and extend and retract in conjunction with the expansion and contraction operation of the expansion and contraction mast 10. It has become.

As shown in FIG. 11A, in the telescopic locking device 70a, a link mechanism 74 is disposed between the lock pin 71 and the first split operation rod 73a in the lower mast member 30.
The link mechanism 74 includes a lever link 75 projecting from the outer peripheral surface of the first split operation rod 73 a and a push-pull link 76 disposed so as to connect the lever link 75 and the lock pin 71. .
One end portion of the push-pull link 76 is connected to the distal end portion of the lever link 75 via the pin 77, and the other end portion of the push-pull link 76 is connected to the proximal end portion of the lock pin 71 via the pin 78. Yes.
An intermediate portion of the push-pull link 76 is connected to a tip end portion of a bracket 79 protruding from the lower mast member 30 via a pin 80, and can be rotated around the pin 80.

As shown in FIG. 6A, a link mechanism 81 is disposed between the operation rod 73 and the lower mast member 30.
As shown in FIG. 6B, the link mechanism 81 converts the manual operation of the tilting operation of the lock lever 82 into a rotational operation force that rotates the operating rod 73. A pulling link 84 and a lever link 85 are included.
The tilt link 83 is provided integrally with the lock lever 82, and an intermediate portion thereof is connected to the other side surface 30b of the lower mast member 30 via a pin 86, and rotates around the pin 86 along a vertical surface. It is possible.
The lever link 85 projects from the outer peripheral surface of the first split operation rod 73a in the direction opposite to the lever link 75 described above.
One end of the push-pull link 84 is connected to the end of the tilting link 83 via the pin 87, and the other end of the push-pull link 84 is connected to the tip of the lever link 85 via the pin 88. .

As shown in FIG. 11A, when the lock lever 82 is tilted to the right side in the drawing, the first split operation rod 73a is rotated outward about its axis. Thus, when an operating force that rotates the first split operation rod 73a outward about its axis is applied to the first split operation rod 73a, the link mechanism 74 pushes the lock pin 71 in. Thus, the lock pin 71 can be inserted into the lock pin insertion hole 72 of the first intermediate mast member 31.
On the other hand, as shown in FIG. 11B, when the lock lever 82 is tilted to the left in the drawing, the first split operation rod 73a is rotated inwardly around its axis. Thus, when an operating force for rotating the first split operation rod 73a inwardly about its axis is applied to the first split operation rod 73a, the operation force is pulled out by the link mechanism 74. Thus, the lock pin 71 can be extracted from the lock pin insertion hole 72 of the first intermediate mast member 31.

  Since the first split operation rod 73a, the second split operation rod 73b, and the third split operation rod 73c rotate integrally, all the lock pins 71 are simultaneously interlocked to perform the above-described lock pin insertion / removal operation. It will be.

<Explanation of jib folding structure>
As shown in FIG. 1 and FIG. 2, the jib 11 is divided into a front jib 11a and a rear jib 11b at an intermediate position near the base in the longitudinal direction, and a pin 90a is the center of oscillation on the lower surface side. The front jib 11a and the rear jib 11b are joined by the hinge mechanism 90, and the front jib 11a is swung with respect to the rear jib 11b with the pin 90a as a base point, as shown in FIG. 11a and the rear jib 11b can be switched between a straight line state that can be used in a straight line and a middle bent state in which the front jib 11a is bent with respect to the rear jib 11b as shown in FIG. Yes.

A hoisting first sheave 91 is rotatably attached to the upper portion of the telescopic mast 10 via a bracket 20.
A sheave support 11c arranged so as to straddle the respective upper surfaces of the front jib 11a and the rear jib 11b in the linear state where the jib 11 can be used is fixed to the base end portion of the front jib 11a. The second sheave 92 for undulation is rotatably attached to the rear end portion of the support 11c.
The wire rope 93 wound around the winding drum of the hoisting winch 16 is wound around the hoisting first sheave 91 and the hoisting second sheave 92, and its tip is fixed to the sheave support 11c.

  As shown in FIG. 2, when the hoisting winch 16 is wound in the middle state of the jib 11, the first sheave 91 for undulation and the second sheave 92 for undulation are approached by the wire rope 93. Accordingly, the front jib 11a bent with respect to the rear jib 11b is raised with the pin 90a as a base point, and the front jib 11a and the rear jib 11b are arranged in a straight line so that the jib 11 is 1 is a straight line represented by a two-dot chain line indicated by reference numeral 11 'in FIG. 1, and when the hoisting winch 16 is further wound up, the jib 11 is raised from the pin 12 as a base point. It can be erected as represented by a two-dot chain line indicated by 11 ″.

  In the undulating jib 11 ″ shown in FIG. 1, when the raising / lowering winch 16 is fed out, it is possible to obtain the lying jib 11 ′ from the pin 12 as a starting point, and further, the raising / lowering winch 16 is fed out. 2, the first sheave 91 for undulation and the second sheave 92 for undulation are moved relative to each other so that the front jib 11 a is bent with respect to the rear jib 11 b with the pin 90 a as a base point, as shown in FIG. As described above, the jib 11 can be in a folded state.

<Instructions for using the floor crane>
The use of the floor crane 1 configured as described above will be described below.

  When the floor crane 1 is not used or transferred, the telescopic mast 10 is contracted and the jib 11 is folded as shown in FIG. Thus, since it can be made more compact when not in use or the like, the floor crane 1 can be stored without taking up much space, and the floor crane 1 can be transferred more easily.

When using the floor crane 1, first, the traveling direction of the carriage 3 is changed by operating the steering bar 5 to move the floor crane 1 to the work position on the floor 2.
Next, the outrigger 7 mounted on the carriage 3 is extended in the lateral direction of the carriage 3, and the carriage 3 is lifted by the jack 6.
Next, the hoisting winch 16 is wound up, and the front jib 11a is raised with respect to the rear jib 11b to bring the jib 11 into a straight state.
Subsequently, the hoisting operation of the telescopic winch 37 is performed, and the telescopic mast 10 is expanded.
Next, as shown in FIG. 11A, the lock lever 82 is tilted to the right in the drawing, and the operation rod 73 is rotated outwardly about its axis, so that all the lock pins 71 are inserted. The lower mast member 30, the first intermediate mast member 31, the second intermediate mast member 32, and the upper mast member 33 are stopped by the lock pin 71.
Thus, the floor crane 1 can be put into a usable state when carrying out the crane work.

  Then, the turning motion of the turning frame 9 by the operation of the turning motor 26 (see FIG. 3), the raising and lowering operation of the jib 11 by the hoisting and unwinding operation of the hoisting winch 16, and the hook block by the hoisting and unwinding operation of the cargo handling winch 15 24 according to the raising / lowering position of the jib 11 and the extension length of the telescopic mast 10 within a predetermined working radius determined by the length of the jib 11 and the raising / lowering position of the jib 11 with reference to the turning center of the turning frame 9. The lifting or lowering operation of the load hung on the hook 24a of the hook block 24 can be performed with a high lift.

  In addition, it can be set as a compact form as FIG. 2 shows by implementing the reverse procedure of the procedure which makes the state which can use the floor crane 1 mentioned above.

<Description of effects>
According to the floor crane 1 of the present embodiment, the telescopic mast 10 is installed on the carriage 3 via the revolving frame 9, and the jib 11 is attached to the upper part of the telescopic mast 10 so that the telescopic mast 10 can be raised and lowered. When the jib 11 is raised and lowered in the direction, and within a predetermined working radius determined by the length of the jib 11 and the raising position of the jib 11 with respect to the turning center of the turning frame 9, The crane operation can be performed with a high head according to the extension length of the telescopic mast 10. Therefore, it is possible to realize a high head while ensuring a predetermined working radius.

Furthermore, the following effects (1) to (5) can be obtained.
(1) By the winding / unwinding operation of the wire rope 40 by the expansion / contraction winch 37, the first intermediate mast member 31 is raised / lowered with respect to the lower mast member 30. While the intermediate mast member 32 is raised and lowered with respect to the first intermediate mast member 31, the upper mast member 33 is raised and lowered with respect to the second intermediate mast member 32 by the wire rope 42, and the telescopic mast 10 is expanded and contracted. Therefore, the height dimension of the floor crane can be made compact by reducing the length dimension of the mast members 30 to 33 as much as possible, and the number of steps of the mast members 30 to 33 can be increased. The lift can be made higher.
(2) Even if the wire rope 40 is cut, the winch side fall prevention device 38 and the tail side fall prevention device 39 can prevent the expansion and contraction mast 10 from contracting due to gravity.
(3) When the telescopic mast 10 is in the extended state, the boundary between the lower mast member 30 and the first intermediate mast member 31, the boundary between the first intermediate mast member 31 and the second intermediate mast member 32, and the second Since the lock pin 71 is inserted into the boundary portion between the intermediate mast member 32 and the upper mast member 33 by the extension lock devices 70a to 70c, the extension state of the extension mast 10 can be reliably maintained.
(4) The lock pin 71 is inserted / removed by a telescopic operation configured such that the first split operation rod 73a, the second split operation rod 73b, and the third split operation rod 73c rotate together. By rotating the rod 73, all the lock pins 71 are simultaneously interlocked, so that the lock pin 71 can be easily and quickly inserted and removed.
(5) Since the jib 11 can be bent in the middle of the longitudinal direction, it can be made more compact when not in use, and the floor crane 1 can be transferred more easily.

  As mentioned above, although the floor crane of this invention was demonstrated based on one embodiment, this invention is not limited to the structure described in the said embodiment, The structure is suitably changed in the range which does not deviate from the meaning. Is something that can be done.

  Since the floor crane of the present invention has a characteristic that a high lift can be achieved while ensuring a predetermined work radius, it can be used for crane work such as entering a building and hanging a beam frame. Can be suitably used.

DESCRIPTION OF SYMBOLS 1 Floor crane 2 Floor 3 Bogie 9 Revolving frame 10 Telescopic mast 11 Jib 11a Front jib 11b Rear jib 16 Unwind winch 23 Wire rope 30 Lower mast member 31 First intermediate mast member 32 Second intermediate mast member 33 Upper mast member 38 Winch side fall prevention device 39 tail side fall prevention device 40-42 wire rope 51 receiving member 51a inclined receiving surface 52 brake body 55, 65 link mechanism 71 lock pin 73 operating rod 90 hinge mechanism 91 first raising sheave 92 first raising 2 sheave 93 wire rope

Claims (5)

Comprising a movable carriage on the floor, on a revolving frame provided pivotably relative to said carriage, and installing a retractable telescoping mast in the vertical direction, freely undulating jib hanging a load on top of the telescoping mast in mounted ing floor crane,
The telescopic mast is a side for storing a plurality of hollow mast members having different opening sizes in order of the opening size, and storing the mast member when the telescopic mast is in an extended state. A lock pin that is inserted so as to connect the retractable mast member to the retractable mast member that is to be stored is provided, and an operation rod that transmits an operation force for inserting / removing the lock pin to the lock pin is provided A floor crane arranged along a telescopic mast, wherein the operation rod can be expanded and contracted in accordance with the expansion and contraction of the telescopic mast . Sieve was disposed at the distal end portion of the price paid mast member, said sheave and said turning the wire rope between the base end portion of the storage mast member, said of the object to be stored mast member relative to the storage mast member The floor crane according to claim 1, wherein the telescopic mast is extended or contracted by an ascending operation or a descending operation by a wire rope. Wherein when the tension of the wire rope is lost, floor crane of claim 2, fall prevention device is provided, wherein the storage mast member relative to said storing the mast member is prevented from falling.   The fall prevention device has an inclined receiving surface whose distance from the side surface of the to-be-stored mast member is shortened as it proceeds downward, and the storing mast member has the inclined receiving surface facing the side surface of the to-be-stored mast member. And a brake member between the inclined receiving surface of the receiving member and the side surface of the stored mast member, while contacting the inclined receiving surface of the receiving member, on the side surface of the stored mast member It is arranged to be movable between a non-braking position that does not contact and a braking position that contacts the inclined receiving surface of the receiving member and the side surface of the stored mast member at the same time, and between the wire rope and the brake body. When the wire rope is tensioned by the link mechanism, the brake body is held in the non-braking position, while the wire rope tension is lost. Floor crane according to configured claim 3 to moves to the braking position the braking body. The jib is divided into a front jib and a rear jib, the front jib and the rear jib are joined by a hinge mechanism, and the front jib and the rear jib are arranged in a straight line, and the rear It is possible to switch to a folded state in which the front jib is bent with respect to the jib, and the first sheave for undulation is rotatably disposed on the telescopic mast side, and the second sheave for undulation on the front jib side Is arranged rotatably, and a wire rope from a hoisting winch for raising and lowering the jib is hung around the first and second sheaves for raising and lowering. When the jib is in a straight line state and the hoisting winch continues to wind, the jib is raised and the jib is lowered by the extending operation of the hoisting winch, and the hoisting winch is further extended. continue If, floor crane according to any one of claims 1 to 4, wherein the jib is a center bending state.

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