JP2018118795A - Guy arm and crane arm with guy arm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a guy arm which is easily attached/detached and capable of completely preventing a falling or loosing accident of a bolt/nut, and a crane arm provided with the guy arm.SOLUTION: A crane arm 1 has a vertical frame member 5 that is attached roughly vertically, and a lateral frame member 6 that is roughly perpendicularly coupled to the vertical frame member 5. The lateral frame member 6 is provided with a first engaging part 10, and a second engaging part 11 that is positioned closer to the vertical frame member 5 side than the first engaging part 10, and a guy arm 13 attached to the crane arm 1 is provided with a third engaging part 16 that is engaged with the first engaging part 10, and a fourth engaging part 17 that is engaged with the second engaging part 11. A winch side pulley attaching part 8 at the lower end of the vertical frame member 5 has a key hole 34 of a rope retaining pin 33 in a side plate. The rope retaining pin 33 has a projected part corresponding to the key hole 34, and a knob part 22b rotates perpendicularly downward by gravity after inserted into a notch of the key hole.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an intermediate arm of a crane arm used when lifting a scaffold member (temporary material) or the like, and a crane arm provided with the intermediate arm.

  In general, at construction sites, temporary scaffolding is built around the building so that workers can access the outer periphery of the building, and construction materials are lifted and carried to a predetermined location of the temporary scaffolding or a predetermined floor of the building. ing.

  In order to lift the scaffolding member, a crane arm is attached to a temporary scaffold previously installed, ropes are wound around a plurality of pulleys including a pulley provided in the crane arm, a winch device is used as power, and a simple crane is constructed. It is widely used. An intervening arm is attached to a simple crane as needed.

  FIG. 9 shows an example of using a conventional simple crane. FIG. 9 (a) shows an enlarged view of the crane arm and the intermediate arm portion.

  The temporary scaffold 50 is assembled at a height necessary for the outer periphery of the building 51. The temporary scaffold 50 has a plurality of gate-shaped frames connected in the horizontal direction by brace members and stepping plate members, and a plurality of stages are assembled in the vertical direction as shown in the figure.

  The crane arm 52 is normally detachably attached to an appropriate vertical member 50 a at the uppermost stage of the temporary scaffold 50 via a plurality of clamps 53. The clamp 53 is attached to the base column 54 of the crane arm 52, and the base column 54 of the crane arm 52 is attached in parallel to the vertical member 50 a of the temporary scaffold via the clamp 53.

  A swing hinge 55 is attached to the base column 54, and a vertical frame member 56 of a crane arm is attached via the swing hinge 55. A horizontal frame member 57 is attached to the upper end portion of the vertical frame member 56 at a right angle to the vertical frame member 56. An oblique brace member 58 is attached between the vertical frame member 56 and the horizontal frame member 57.

  The vertical frame member 56, the horizontal frame member 57, and the brace member 58 constitute a bracket portion of the crane arm, and the bracket portion of the crane arm can be turned in a horizontal plane by the action of the turning hinge 55.

  When it is desired to control the turning motion of the bracket portion of the crane arm 52, the intervention arm 59 is attached to the distal end portion of the horizontal frame member 57 of the crane arm 52. FIG. 9 shows a state in which the interposition arm 59 is attached.

  The interposition arm 59 has an arm member 60, the arm member 60 has two sets of fixing brackets 61 on both sides, and is detachably fixed to the lateral frame member 57 of the crane arm 52 by bolts and nuts 62.

  A winch side pulley 63 is attached to the lower end portion of the vertical frame member 56. Further, a load side pulley mounting bracket 64 is attached to the front end portion of the horizontal frame member 57, and a load side pulley 65 is attached to the load side pulley mounting bracket 64. A guide rope fitting 66 is attached to the tip of the interposition arm 59.

The wire rope 67 for lifting the load is fed out from the winch device 68, wound around the winch side pulley 63, hung around the load side pulley 65, and connected to the hanging hook 69.
A stay 71 and a sling rope 72 of a guide rope pulley 70 are attached to the suspension hook 69 via a shackle.

  One end of a guide rope guide rope 73 is attached to the guide rope mounting bracket 66 via a hook, and the guide rope 73 is hung on a guide rope pulley 70 and hangs down to the ground.

  When lifting the load, the number of persons is not limited, but the worker A is placed on the ground, the worker B is placed on the temporary scaffold 50, the worker A attaches the sling rope 72 to the suspended load 74, and the winch device 68. Is operated to wind up the wire rope 67 for lifting the load and lift the suspended load 74.

  When the suspended load 74 reaches the height of the worker B, the worker B turns the bracket portion of the crane arm 52 as necessary, pulls the suspended load 74, unwinds the sling rope 72, and lifts the suspended load 74. Is transported to a predetermined place such as the building 51.

  During the lifting of the suspended load 74, the worker A grips the lower end of the guide rope 73, controls the lateral swing of the suspended load 74, and the worker B works as necessary when taking in the suspended load 74. In cooperation with member B, the turning of the bracket portion of the crane arm 52 is controlled.

  Since the winch side pulley 63 is positioned at the center of turning of the bracket portion of the crane arm 52, the wire rope 67 for lifting the load can be used even when the bracket portion of the crane arm 52 is turning in a horizontal plane. From the device 68 to the winch side pulley 63, a vertical and substantially fixed position is maintained, so that the wire rope 67 for lifting the load is less likely to come off from the winch side pulley 63.

Japanese Patent No. 5948542

  In the above-described conventional technology, the crane arm is stabilized in swinging when the load is suspended by providing an intervening arm on the crane arm and gripping the guide rope. However, when removing or installing the interposition arm at the construction site, there was a place to be improved.

  As described above, the crane arm is attached to the uppermost stage of the temporary scaffold, but it is necessary to reduce the weight as much as possible to carry the crane arm to the uppermost stage of the temporary scaffold. They were lifted and attached to the installation location, and then an intervening arm was attached to the tip of the crane arm.

  In some cases, only the crane arm is used without using the intervening arm, and then the intervening arm is attached as necessary.

  In such a case, the installation and removal of the interventional arm is often performed at a high place.

  In the case of the conventional intervention arm, if it is explained as an example of removal, the bolts and nuts that fix the intervention arm to the horizontal frame member of the crane arm must be removed, and at that time careful attention is required for the work. Although it was paid, the possibility of dropping the bolts and nuts could not be completely wiped out.

  Also, the work of attaching and removing bolts and nuts on the horizontal frame member of the crane arm is difficult due to its high location, and the work efficiency is poor.

  Furthermore, even if the bolts and nuts are safely removed with great care, there is a possibility that the removed bolts and nuts may be lost at construction sites where there are many construction materials.

  Therefore, the present invention solves the above-mentioned problems of the prior art, is an easy-to-remove and attach- ment, and an intervening arm that can completely prevent a bolt or nut from dropping or losing, and a crane arm having the intervening arm The purpose is to provide.

  The present application includes a plurality of means for solving at least a part of the above-described problems. Examples of the means are as follows.

  The intervention arm according to the present invention is an intervention arm that can be attached to a crane arm, and the crane arm includes a vertical frame member that is attached substantially vertically and a horizontal frame member that is coupled to the vertical frame member at a substantially right angle. The horizontal frame member is provided with a first engagement portion and a second engagement portion located on the vertical frame member side with respect to the first engagement portion, and the interposition arm has the first engagement portion. A third engagement portion for engaging with the engagement portion and a fourth engagement portion for engaging with the second engagement member are provided.

  According to another intervening arm according to the present invention, the third engaging portion engages with the first engaging portion to restrict movement of the interposing arm in a direction away from the vertical frame member, The fourth engaging portion can restrict movement of the interposition arm in a direction approaching the vertical frame member by engaging with the second engaging portion.

  According to another intervening arm according to the present invention, the third engaging portion is a notch opened in a direction opposite to the position of the vertical frame member, and the protrusion of the first engaging portion is formed in the notch. The parts can be engaged.

  According to another intervening arm according to the present invention, the second engaging portion includes a joining surface for contacting the end surface of the interposing arm in the vertical frame member direction, and a lock pin parallel to the horizontal frame member. The fourth engagement portion includes a through hole at the end surface in the vertical frame member direction, the lock pin is inserted into the through hole, and the joining surface of the second engagement portion is at the end surface. It can be made to engage with said 2nd engaging part by contact | abutting.

  The lock pin can move in parallel.

  According to another intervening arm according to the present invention, the lock pin can be urged by a coil spring in a direction in which a tip of the lock pin is inserted into the through hole.

  According to another intervening arm according to the present invention, the lock pin has a substantially L-shape having a lock pin main body portion parallel to the horizontal frame member and a knob portion coupled perpendicularly to the lock pin main body portion, Movement of the tip of the knob can be restricted by a stopper portion of a leaf spring.

  According to another intervening arm according to the present invention, the fourth engaging portion may have a peephole in which at least a part of the lock pin that has penetrated the through hole can be visually confirmed.

  The crane arm according to the present invention includes any one of the intervening arms.

  According to another crane arm according to the present invention, a winch side pulley mounting portion is provided at a lower end portion of the vertical frame member, and the winch side pulley mounting portion includes a pulley and a pair of side plates that rotatably support the pulley. And a rope retaining pin for preventing the lifting of the load hanging rope inserted into the side plate, wherein one of the side plates has a through-hole through which the rope retaining pin is inserted, and the other of the side plate is the rope retaining pin. A keyhole having a notch in a part of a circular periphery through which the distal end is inserted, and the rope fastening pin has a substantially L-shape including a main body portion and a knob portion, and the distal end portion of the main body portion In addition, a protrusion may be provided at a position that does not align with the notch of the keyhole when the knob is rotated vertically downward by gravity after being inserted through the notch of the keyhole.

  According to another crane arm according to the present invention, a vertical frame member attached substantially vertically and a horizontal frame member coupled to the vertical frame member at a substantially right angle are provided, and a winch side pulley is attached to a lower end portion of the vertical frame member. The winch side pulley mounting portion includes a pulley, a pair of side plates that rotatably support the pulley, and a rope fastening pin for preventing the lifting of a load hanging rope inserted through the side plate, One of the side plates has a through-hole through which the rope fastening pin is inserted, and the other of the side plates has a keyhole having a notch in a part of a circular circumference through the tip of the rope fastening pin, The pin has a substantially L-shape consisting of a main body portion and a knob portion, and the knob portion is rotated vertically downward by gravity after the notch of the key hole is inserted into the distal end portion of the main body portion. Sometimes the keyhole is cut It can be made to have a projection at a position not come and aligned.

  According to the present invention, the crane arm includes the first engagement portion and the second engagement portion, the interposition arm includes the third engagement portion and the fourth engagement portion, and the interposition arm and the crane arm are attached and detached. It can be performed by instantaneous attachment and detachment of these engaging portions. For this reason, the installation and removal work of the interposition arm becomes easy and efficient. Furthermore, according to the present invention, since fastening fasteners such as bolts and nuts are not used, it is possible to completely prevent accidents and loss of bolts and nuts. Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

It is the whole assembly figure of the intervention arm and crane arm by one Embodiment of this invention. Plan view 2 (a) of the interposition arm according to the embodiment of the present invention, side view 2 (b) seen in the direction of arrow A-A in plan view 2 (a), and arrow B in side view 2 (b) It is the side view 2 (c) seen in the -B direction. FIG. 3A is a plan view of a guide wall structure of a second engaging portion of a crane arm according to an embodiment of the present invention, and FIG. 3B is a side view of the guide wall structure viewed in the direction of arrow AA in FIG. FIG. 3 (c) is a side view seen in the direction of arrow BB in FIG. 3 (a), and FIG. 3 (d) is a plan view of the fixing plate and it is seen in the direction of arrow CC in FIG. 3 (d). FIG. 3 (e) is a side view. It is the top view 4 (a) of the leaf | plate spring of the 2nd engaging part of the crane arm by one Embodiment of this invention, and the side view 4 (b) seen from the arrow AA direction of the top view 4 (a). . It is a side view of the swing hinge of the crane arm by one Embodiment of this invention. It is a side view of the 1st side plate of the winch side pulley attachment part of the crane arm by one Embodiment of this invention. In side view 7 (a) of the second side plate of the winch side pulley mounting portion of the crane arm according to one embodiment of the present invention, and in front view 7 (b) seen in the direction of arrow AA in side view 7 (a). is there. It is the top view 8 (a) of the rope fastening pin by one Embodiment of this invention, and its side view 8 (b). It is explanatory drawing which shows the use condition of the conventional crane arm.

  An embodiment, which is an example to which the present invention is applied, will be described below.

  FIG. 1 shows an overall assembly diagram of an intermediary arm according to an embodiment of the present invention and a crane arm according to an embodiment of the present invention.

  The crane arm 1 includes a base column 3 attached to a vertical member of a temporary scaffold (not shown) via a plurality of clamps 2, two upper and lower swing hinges 4 attached to the base column 3, and a swing side of the swing hinge 4. The attached vertical frame member 5, the horizontal frame member 6 attached at right angles to the upper end of the vertical frame member 5, and the brace member 7 that is slanted between the vertical frame member 5 and the horizontal frame member 6. And a winch side pulley attachment portion 8 attached to the lower end portion of the vertical frame member 5.

  A load side pulley mounting bracket 9 for attaching a load-carrying pulley is attached to the front end of the horizontal frame member 6. Further, a first engaging portion 10 that engages with an intervening arm 13 described later is provided at the distal end portion of the horizontal frame member 6. Specifically, the first engaging portion 10 can be formed by a rod-like member having a protruding portion that slightly protrudes from the side of the lateral frame member 6, for example.

  A second engaging portion 11 of the horizontal frame member 6 is provided at a position closer to the vertical frame member 5 than the first engaging portion 10. A shackle 12 for lifting the crane arm 1 is provided on a part of the horizontal frame member 6 above the position of the center of gravity of the crane arm 1.

  As shown in FIG. 1 (a), the interposition arm 13 is mounted on the horizontal frame member 6 of the crane arm 1 in the mounted state. FIG. 2 shows the intervening arm 13 as a single unit. 2 (a) is a plan view of the interposition arm 13, FIG. 2 (b) is a side view of the interposition arm 13 as viewed in the direction of arrow AA in FIG. 2 (a), and FIG. 2 (c) is FIG. The other side view of the interposition arm 13 seen in the direction of arrow BB in FIG. The explanation of the following intervening arm 13 can be easily understood by referring to FIGS. 1 and 2 together.

  The intervening arm 13 includes an arm member 14 that is mounted substantially parallel to the horizontal frame member 6, and a guide rope mounting bracket 15 that attaches a guide rope is attached to the tip of the arm member 14. FIG. 1 (b) is a front view as seen from the direction of arrow AA in FIG. 1 (a). As shown in the figure, when the crane arm 1 and the interposition arm 13 are seen from the front, The tip, guide rope mounting bracket 15 and load side pulley mounting bracket 9 are visible.

  A third engagement portion 16 that engages with the first engagement portion 10 is provided at a position that aligns with the first engagement portion 10 of the lateral frame member 6 of the crane arm 1 on the proximal side from the distal end of the arm member 14. It has been.

  A fourth engagement portion 17 that engages with the second engagement portion 11 is provided at a position that is the base end portion of the arm member 14 and aligns with the second engagement portion 11 of the horizontal frame member 6 of the crane arm 1. It has been.

  As shown in FIGS. 1 (a), 2 (a), and 2 (b), the third engagement portion 16 is composed of, for example, a pair of plate members fixed to both side surfaces of the arm member 14, and the plate members Has a notch that engages with the protrusion of the rod-like member of the first engaging portion 10, and the notch is opened in the direction opposite to the distal end side of the interposition arm 13, that is, the position of the vertical frame member 5 of the crane arm 1. It is a notch.

  As shown in FIGS. 1 (a), 1 (c) and FIGS. 2 (a), 2 (b), 2 (c), the fourth engaging portion 17 is fixed to the base end portion of the arm member 14. The plate member 18 is bent into a U-shape. Both sides of the plate member 18 bent in a U-shape are opened so that they can be seen through, and a peep hole 19 for confirming a penetration state of a lock pin 22 described later is formed. A through hole 20 is formed in the vertical wall portion of the plate member 18.

  FIG. 1 (c) is an enlarged view of the engaging portion of the second engaging portion 11 of the crane arm 1 and the fourth engaging portion 17 of the interposition arm 13, and the second engaging portion 11 and the fourth engaging portion 17. The engagement state is shown. 1 (a) and 1 (c) show the entire second engaging portion 11, FIG. 1 (c ′) shows a state in which the lock pin 22 of the second engaging portion 11 is removed, and FIG. FIG. 4 shows a leaf spring for controlling the movement of the lock pin 22. FIG. 4 shows a guide portion for the lock pin 22 of the second engagement portion 11. 3 (a) is a plan view of the guide wall structure for the lock pin 22, FIG. 3 (b) is a side view of the guide wall structure as viewed in the direction of arrow AA in FIG. 3 (a), and FIG. (c) has shown the side view of the guide wall structure seen in the arrow BB direction of Fig.3 (a). FIG. 3 (d) is a plan view of a fixing plate for fixing the leaf spring, and FIG. 3 (e) is a side view of the fixing plate seen in the direction of arrow CC in FIG. 3 (d). 4A is a plan view of the leaf spring, and FIG. 4B is a side view of the leaf spring as viewed in the direction of arrow AA in FIG. The following description of the second engaging portion 11 can be easily understood by referring to FIG. 1, FIG. 3, and FIG.

  As clearly shown particularly in FIG. 1 (c), the second engaging portion 11 includes a portal plate member 21 fixed to the lateral frame member 6, a lock pin 22, a guide wall structure 23, a leaf spring. 24 and a coil spring 25.

  On the vertical wall portion of the portal plate member 21, through holes 26 and 27 are provided at positions that are aligned with the through holes 20 of the fourth engaging portion 17. In the engaged state, the through holes 26 and 27 of the second engaging portion 11 and the through holes 20 of the fourth engaging portion 17 are aligned, and the lock pin 22 is inserted as shown in FIGS. 1 (a) and 1 (c). Is done.

  The lock pin 22 has a rod-shaped main body portion 22a that is parallel to the horizontal frame member 6 and has a circular cross section, and a knob portion 22b that is connected substantially vertically, and has an L shape as a whole. A groove (not shown) is formed on the side of the knob 22b slightly from the tip of the main body 22a, and an E-shaped retaining ring 28e is fitted in the groove, and a ring-shaped portion is formed on the knob 22b side of the E-shaped retaining ring 28e. The lock washer 28 is provided. The coil spring 25 presses the lock washer 28 together with the E-shaped retaining ring 28 e to urge the lock pin 22 toward the distal end direction of the interposition arm 13, that is, toward the fourth engagement portion 17. A washer 28w is fitted on the front end side of the lock pin as viewed from the E-type retaining ring 28e so that the E-shaped retaining ring 28e does not directly contact the wall of the portal plate member 21.

  The guide wall structure 23 is welded and fixed to the horizontal frame member 6. A groove is formed between a pair of opposing wall portions of the guide wall structure 23, and the lower end portion of the knob portion 22 b of the lock pin 22 passes through and guides it.

  The fixed plate 29 is fixed to the guide wall structure 23. The plate spring 24 has a base end portion 24a fixed to the fixing plate 29 with a screw, and has an inclined portion 24b that becomes higher as it goes to the tip end as shown in FIG. have.

  When the second engaging portion 11 and the fourth engaging portion 17 are engaged, the end face 18 in the direction of the vertical frame member 5 of the plate member 18 of the fourth engaging portion 17 as shown in FIG. 'And the joint surface 21' of the portal plate member 21 of the second engagement portion 11 are in contact with each other, and the through hole 20 and the through hole 26 are in alignment. Note that the end face 18 ′ in the direction of the vertical frame member 5 and the joint surface 21 ′ of the portal plate member 21 of the second engaging portion 11 do not always have to contact each other, even if there is a slight clearance. Good. However, when the clearance arm is provided and the intervening arm 13 is displaced in the direction in which the end face 18 ′ and the joint surface 21 ′ are in contact with each other, the first engagement portion 10 is removed from the notch of the third engagement portion 13. It is necessary to prevent the protruding portion of the rod-shaped member from being detached. Therefore, when there is a clearance, the maximum value of the distance is prevented from exceeding the notch depth of the third engagement portion 13.

  When the lock pin 22 is surely engaged, the lock pin 22 is urged by the coil spring 25 in the direction of the fourth engagement portion 17, so that the knob 22 b is guided by the groove of the guide wall structure 23. The part 22 a moves in parallel with the horizontal frame member 6.

  After the distal end of the lock pin 22 is inserted into the through hole 20 of the plate member 18 of the fourth engaging portion 17, the lower end of the knob 22 b gets over the inclined portion 24 b of the leaf spring 24, thereby the distal end portion of the leaf spring 24. The stopper portion 24c engages with the lower end portion of the knob portion 22b of the lock pin 22, and the movement of the lock pin 22 is restricted so that the lock pin 22 does not return backward.

  On the other hand, when releasing the engagement between the second engagement portion 11 and the fourth engagement portion 17, the tip end portion of the leaf spring 24 is pushed down with a finger, and the stopper portion 24 c of the leaf spring 24 and the knob portion of the lock pin 22. The engagement of 22b is released, and the pin 22b of the lock pin 22 is grasped and pulled in the direction of the vertical frame member 5, whereby the lock pin 22 is translated in the direction of the vertical frame member 5, and the tip thereof is shown in FIG. As shown in c ′), the second engagement portion 11 and the fourth engagement portion 17 are disengaged by coming out of the through hole 20 of the plate member 18 of the fourth engagement portion 17.

  FIG. 5 shows the structure of the swing hinge 4. As shown in FIG. 5, the swing hinge 4 includes a first hinge member 4a fixed to the base column 3, a second hinge member 4b fixed to the vertical frame member 5, a first hinge member 4a, and a second hinge member. And a support shaft 4c through which 4b is pivotably inserted.

  At least two swivel hinges 4 are provided between the base column 3 and the vertical frame member 5 in the vertical direction. As a result, in the mounted state, the crane arm 1 and the interposition arm 13 can turn in a horizontal plane substantially around the support shaft (pivot pin) 4c. In this case, the rope entrance of the winch side pulley mounting portion 8 Therefore, even if the crane arm 1 and the intermediary arm 13 turn during the load hanging, the load hanging rope is stabilized and does not come off the winch side pulley mounting portion 8.

  FIG.1 (d) is the longitudinal cross-sectional view of the winch side pulley attachment part 8 seen in the arrow BB direction of Fig.1 (a). FIG.1 (e) is a side view of the winch side pulley attachment part 8 seen in the arrow CC direction of Fig.1 (a).

  The winch side pulley mounting portion 8 includes a first side plate 30, a second side plate 31, a sheave 32 rotatably provided between the first side plate 30 and the second side plate 31, and a first side plate 30. A rope fastening pin 33 is provided between the second side plates 31.

  FIG. 6 shows a side view of the first side plate 30. FIG. 7 shows a side view 7 (a) of the second side plate 31 and a front view 7 (b) viewed in the direction of the arrow AA in the side view 7 (a). FIG. 8 shows a plan view and a side view of the rope fastening pin 33. The following explanation of the winch side pulley mounting portion 8 is easy to understand by referring also to FIG.

  The winch side pulley mounting portion 8 is fixed to the lower end portion of the vertical frame member 5 of the crane arm 1. As shown in FIG. 6, the first side plate 30 of the winch side pulley mounting portion 8 has a key hole 34 having a notch in a part of the peripheral edge portion. The notch of the key hole 34 is notched downward in the use state of the winch side pulley mounting portion 8.

  As shown in FIG. 7, the second side plate 31 of the winch side pulley mounting portion 8 has an insertion hole 35 for inserting the rope fastening pin 33 at a position aligned with the key hole 34 of the first side plate 30. A sleeve 36 for stabilizing the rope fastening pin 33 is provided at the peripheral edge of the insertion hole 35.

  As shown in FIG. 8, the rope fastening pin 33 is formed at a substantially right angle with respect to the rope fastening pin main body portion 33a spanned between the first side plate 30 and the second side plate 31, and the rope fastening pin main body portion 33a. And a rope retaining pin picking portion 33b.

  A hole 37 is provided at the tip of the rope fastening pin main body 33a, and a spring pin 38 that elastically expands outward is mounted in the hole 37. After the spring pin 38 is attached to the hole 37 in a compressed state, the spring pin 38 is prevented from dropping from the hole 37 due to the elastic force expanding outward.

  The protruding portion of the spring pin 38 is configured to be slightly shorter than the depth of the cutout of the key hole 34.

  The spring pin 38 is mounted after the distal end portion of the rope fastening pin main body portion 33a is inserted into the insertion hole 35. Therefore, the rope fastening pin 33 does not fall off from the second side plate 31, and the rope fastening pin 33 can be prevented from dropping or losing.

  When the crane arm 1 is used, a load-side wire rope from a winch device (not shown) is hung around the sheave 32 of the winch-side pulley mounting portion 8 and is further suspended from the load-side pulley mounting bracket 9. It is wound around a pulley (not shown) and connected to a hanging hook (not shown).

  After the wire rope for hanging is hung around the sheave 32 of the winch side pulley mounting portion 8, the rope fastening pin 33 is inserted into the key hole 34. When the tip of the rope retaining pin 33 is inserted into the key hole 34, the rope retaining pin knob 33b is inserted upward so that the protrusion of the spring pin 38 is aligned with the notch of the key hole 34.

  After the tip of the rope retaining pin 33 has passed through the keyhole 34, the knob 33b falls downward due to the weight of the rope retaining pin 33b, whereby the rope retaining pin 33 is rotated by approximately 180 °, and the spring pin 38 projections engage with the keyhole 34 to prevent the rope pin 33 from falling off.

  By attaching the rope fixing pin 33, the wire rope for hanging around the winch side pulley mounting portion 8 does not lift from the sheave 32, and the wire rope for hanging is prevented from coming off the sheave 32. can do.

  FIG.1 (f) has shown the top view of the clamp 2 seen in the arrow DD direction of Fig.1 (a). FIG.1 (g) has shown the bottom view of the clamp 2 seen in the arrow EE direction of Fig.1 (a). As shown in the figure, the clamp 2 can detachably attach the crane arm 1 to an arbitrary vertical member of a temporary scaffold (not shown) by tightening and releasing a bolt and a clamp member.

  Next, attachment / detachment of the interposition arm 13 according to the present invention will be described.

  As described above, the crane arm 1 is used by being attached to the uppermost stage of the temporary scaffold. However, since the crane arm 1 is carried to the uppermost stage of the temporary scaffold, it is necessary to reduce the weight as much as possible. For this reason, it is often the case that only the crane arm 1 is carried and attached to the mounting location, and then the intermediary arm 13 is attached to the tip of the crane arm 1. Usually, this mounting work is a work at a high place, it is difficult to perform the work, and it is necessary to prevent mounting brackets such as bolts and nuts from dropping. The same applies when removing the interposition arm 13.

  On the other hand, according to the present invention, bolts, nuts and the like can completely prevent a drop accident, and attachment / detachment operations can be completed instantly and easily.

  That is, when attaching the interposition arm 13, first, a pair of plate members fixed to both side surfaces of the arm member 14 of the third engagement portion 16 in a state where the interposition arm 13 is inclined so that the tip end portion is lowered. The pair of plate members are arranged at the position of the base end side of the first engaging portion 10 of the horizontal frame member 6 so as to straddle both sides of the horizontal frame member 6. Thereafter, the third engagement portion 16 is slid toward the first engagement portion 10, and the notch of the third engagement portion 16 is engaged with the protrusion of the first engagement portion 10. As a result, the movement of the third engagement portion 16 further moving toward the distal end side of the interposition arm 13 is restricted, and the notch of the third engagement portion 16 opens in the direction opposite to the direction of the vertical frame member 5. Therefore, the movement of the interposition arm 13 away from the horizontal frame member 6 is limited.

  Almost simultaneously with engaging the notch of the third engagement portion 16 with the projection of the first engagement portion 10, the intervention arm 13 is rotated in the vertical direction about the projection as a rotation axis. The proximal end portion of 13 is brought close to the horizontal frame member 6, the end face 18 ′ of the plate member 18 of the fourth engagement portion 17 of the interposition arm 13 in the vertical frame member direction, and the second engagement portion 11 of the horizontal frame member 6. The joint surface 21 ′ on the distal end side of the horizontal frame member of the portal plate member 21 is brought into contact.

  In a state where the interposition arm 13 is correctly disposed on the horizontal frame member 6, the through hole 20 of the plate member 18 of the fourth engagement portion 17 of the interposition arm 13 and the second engagement portion 11 of the horizontal frame member 6. Since the through hole 26 of the portal plate member 21 is aligned, the distal end portion of the lock pin 22 is inserted into the through hole 20.

Until the tip of the lock pin 22 penetrates the through hole 20, the lock pin body 22 a moves in parallel while being urged by the coil spring 25, and the lock pin knob 22 b passes through the groove between the guide wall structures 23. The lower end passes through the upper surface of the leaf spring 24 while sliding.
When the distal end portion of the lock pin 22 penetrates the through hole 20, the distal end portion of the lock pin 22 can be visually confirmed from the peep hole 19. When the lock pin 22 reaches the correct mounting position, the knob 22b of the lock pin 22 gets over the inclined portion 24b of the plate spring 24, the plate spring 24 jumps up, and the stopper 24c engages with the knob 22b. Thus, the lock pin 22 is prevented from returning backward.

  On the other hand, when removing the interposition arm 13, first, the inclined portion 24 b of the leaf spring 24 is pushed down with a finger, the knob 22 b of the lock pin 22 is picked and pulled, and the lock pin 22 is moved vertically against the force of the coil spring 25. It moves to the direction of the frame member 5, and extracts the front-end | tip part of the lock pin 22 from the through-hole 20 of the plate member 18 of the 4th engaging part 17 of the interposition arm 13 (refer FIG.1 (c ')). Next, while maintaining the engagement between the first engagement portion 10 and the third engagement portion 16, the proximal end portion of the interposition arm 13 is lifted, and the second engagement portion 11 and the fourth engagement portion 17 are engaged. To cancel. Next, the notch of the plate member of the third engagement portion 16 of the interposition arm 13 is removed from the protruding portion of the first engagement portion 10. As a result, the engagement between the first engagement portion 10 and the third engagement portion 16 is released.

  As is clear from the above description, according to the present invention, the attachment and detachment of the interposition arm 13 does not use a separate fastener such as a bolt and a nut, and the attachment and detachment of the interposition arm 13 by two operations. Removal can be completed. Considering that the intervening arm 13 is normally performed at a high place, it is possible to completely prevent the fastening bracket from being dropped and to obtain an extremely safe intervening arm and crane arm. In addition, work at high places becomes extremely easy, and in response to changes in the height of the temporary scaffolding, the crane arm is moved to the uppermost stage of the temporary scaffolding several times, and the intermediary arm is removed and attached each time. Considering this, the work efficiency can be greatly improved. Furthermore, according to the present invention, since there is no separate fastening member, it is possible to completely prevent the fastening member from being lost.

  Based on the above description, those skilled in the art may be able to conceive additional effects and various modifications of the present invention, but the aspects of the present invention are not limited to the above-described embodiments. Various additions, modifications, and partial deletions can be made without departing from the concept and spirit of the present invention derived from the contents defined in the claims and equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Crane arm 2 Clamp 3 Base support | pillar 4 Turning hinge 4a 1st hinge member 4b 2nd hinge member 4c Support shaft 5 Vertical frame member 6 Horizontal frame member 7 Brace member 8 Winch side pulley attachment part 9 Load side pulley attachment metal fitting 10 First Engagement part 11 Second engagement part 12 Shackle 13 Intermediary arm 14 Arm member 15 Guide rope mounting bracket 16 Third engagement part 17 Fourth engagement part 18 Plate member 18 'End surface 19 Peep hole 20 Through hole 21 Gate shape Plate member 21 'Joint surface 22 Lock pin 22a Main body portion 22b Knob portion 23 Guide wall structure 24 Leaf spring 24a Base end portion 24b Inclined portion 24c Stopper portion 25 Coil spring 26 Through hole 27 Through hole 28 Lock washer 28e E-shaped retaining ring 28w Washer 29 Fixed plate 30 First side plate 31 Second side plate 32 Sheave 33 Rope pin 33a Rope pin main body 3b rope pinning knob 34 keyhole 35 through hole 36 sleeve 37 bore 38 spring pin

Claims (11)

An intervening arm that can be attached to a crane arm,
The crane arm is
A vertical frame member attached substantially vertically, and a horizontal frame member coupled to the vertical frame member at a substantially right angle;
The horizontal frame member is provided with a first engagement portion and a second engagement portion located on the vertical frame member side from the first engagement portion,
The intervening arm is
A third engagement portion for engaging with the first engagement portion;
And a fourth engagement portion for engaging with the second engagement portion. The third engagement portion is engaged with the first engagement portion to restrict movement of the interposition arm in a direction away from the vertical frame member,
The interventional arm according to claim 1, wherein the fourth engagement part is engaged with the second engagement part to restrict movement of the interventional arm in a direction approaching the vertical frame member.   The third engagement portion is a notch that is open in a direction opposite to the position of the vertical frame member, and the protrusion of the first engagement portion engages with the notch. Item 3. The intervening arm according to Item 1 or 2. The second engaging portion is
A joining surface for contacting the end face of the interposition arm in the vertical frame member direction, and a lock pin parallel to the horizontal frame member,
The fourth engaging portion is
The longitudinal frame member direction end surface is provided with a through hole,
The lock pin is inserted into the through hole, and the joining surface of the second engagement portion is brought into contact with the end surface to engage with the second engagement portion. The intervening arm according to any one of 3 above.   The interventional arm according to claim 4, wherein the lock pin is movable in parallel.   The interposition arm according to claim 4 or 5, wherein the lock pin is urged by a coil spring in a direction in which a tip of the lock pin is inserted into the through hole. The lock pin has a substantially L shape having a lock pin main body portion parallel to the horizontal frame member and a knob portion coupled vertically to the lock pin main body portion,
The interposition arm according to any one of claims 4 to 6, wherein movement of the tip of the knob is restricted by a stopper portion of a leaf spring.   The said 4th engaging part has a peephole which can confirm at least one part of the said lock pin which dived the said through hole visually, The any one of Claims 4-7 characterized by the above-mentioned. Intervening arm.   The crane arm provided with the interposition arm as described in any one of Claims 1-8. A winch side pulley mounting portion is provided at the lower end of the vertical frame member,
The winch side pulley mounting portion includes a pulley, a pair of side plates that rotatably support the pulley, and a rope fastening pin for preventing the lifting of a load hanging rope inserted through the side plate,
One of the side plates has a through-hole through which the rope fastening pin is inserted, and the other of the side plates has a keyhole having a notch in a part of a circular circumference through the tip of the rope fastening pin,
The rope fastening pin has a substantially L-shape consisting of a main body part and a knob part, and the knob part is vertically lowered by gravity after the notch of the key hole is inserted into the tip part of the main body part. The crane arm according to claim 9, wherein the crane arm has a protrusion at a position that does not align with the notch of the keyhole when rotated. A vertical frame member attached substantially vertically;
A horizontal frame member coupled to the vertical frame member at a substantially right angle;
A winch side pulley mounting portion is provided at the lower end of the vertical frame member,
The winch side pulley mounting portion includes a pulley, a pair of side plates that rotatably support the pulley, and a rope fastening pin for preventing the lifting of a load hanging rope inserted through the side plate,
One of the side plates has a through-hole through which the rope fastening pin is inserted, and the other of the side plates has a keyhole having a notch in a part of a circular circumference through the tip of the rope fastening pin,
The rope fastening pin has a substantially L-shape consisting of a main body part and a knob part, and the knob part is vertically lowered by gravity after the notch of the key hole is inserted into the tip part of the main body part. A crane arm having a protrusion at a position that does not align with the notch of the keyhole when rotated.

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