JP3216178U - Fall prevention device - Google Patents

Abstract

The present invention provides a fall prevention device that can be applied even when there is a restriction on an upper space by reducing the size of an upward projection in a retracted posture. A base end side of a column member 61 is connected to the base member 62 so as to be movable within a predetermined range in the vertical direction in a state where the restriction of the swing of the column member 61 relative to the base member 62 is released. The retracted position is located below the working position. Thereby, since the overall height dimension of the fall prevention device 60 can be reduced in the retracted posture, the fall prevention device 60 can be installed in a place where the upward projecting dimension is limited, and the column member It is possible to improve work efficiency for making the column member 61 workable without separately requiring a place for storing 61. [Selection] Figure 5

Description

  The present invention relates to a crash prevention device provided with a column member that is provided on an upper part of a vehicle body of a work vehicle such as a mobile crane and on which a worker who performs work at a high place on the upper part of the vehicle body hooks a hook of a safety belt. is there.

  In the conventional crash prevention device, a base member fixed at an installation location, a locking portion for locking a safety belt hook or a master rope is provided at the distal end portion, and the base end side is swingable with respect to the base member. There is known a support member provided with a support member provided with a connecting part connected to (for example, Patent Document 1).

  In the fall prevention device, it is possible to switch between a working posture in which the tip end portion of the column member faces upward and a storage posture in which the tip portion of the column member faces sideward.

JP 11-139772 A

  In the fall prevention device, when the retracted posture is adopted, the entire support member projects upward. For this reason, the fall prevention device is difficult to apply when there is a restriction in the upper space, for example, when the fall prevention device is installed on weights stacked on each other, such as a counterweight of a crane device, A detachable fall prevention device for attaching and detaching the column member is applied. The detachable type fall prevention device may reduce the work efficiency of work in high places when it is difficult to secure the storage location for the removed strut member or when the work time for installing the strut member is long. is there.

  An object of the present invention is to provide a crash prevention device that can be applied even when the upper space is limited in a retracted posture and the upper space is limited.

  In order to achieve the above-mentioned object, the present invention is provided with a base member fixed at an installation location, a locking portion for locking a safety belt hook or a master rope at the distal end portion, and a base end side with respect to the base member. A support member that is swingably connected to the support member, and the support member has a working posture in which swinging with respect to the base member is restricted with the tip portion facing upward, and the restriction of swinging with respect to the base member is released. Thus, it is possible to switch between the retracted posture with the tip portion directed sideways, and the base end side of the support member is a predetermined range in the vertical direction in a state where the restriction of the swing of the support member relative to the base member is released. It is connected to the base member so as to be movable inside, and is positioned below the working posture in the retracted posture.

  Thereby, since the height dimension of the base end side of the support member can be reduced in the retracted posture, the overall height dimension of the fall prevention device can be decreased in the retracted posture.

  According to the present invention, since the overall height dimension of the fall prevention device can be reduced in the retracted posture, it can be installed in a place where the upward projecting dimension is limited, and the column member is stored. It is possible to improve work efficiency for making the column member workable without separately requiring a place.

It is a side view of the mobile crane which shows one Embodiment of this invention. It is a rear view of a mobile crane. It is a whole perspective view of the weight provided with the fall prevention device. It is a figure which shows the fall prevention apparatus of a working posture. It is a figure which shows the fall prevention apparatus of a storing attitude | position. It is a principal part perspective view of a fall prevention device. It is a figure explaining the switching procedure of the attitude | position of a fall prevention apparatus. It is a figure explaining the switching procedure of the attitude | position of a fall prevention apparatus.

  1 to 8 show an embodiment of the present invention.

  As shown in FIG. 1, a mobile crane 1 having a crash prevention device of the present invention includes a vehicle body 10 for traveling in a general road or a work area, a crane device 20 for performing crane work, and a vehicle body 10. And a cab 30 for performing crane operation by the crane device 20. The crane device 20 and the cab 30 are supported by a turntable 40 that can turn in the horizontal direction with respect to the vehicle body 10, the crane device 20 is arranged on one side in the width direction of the turntable 40, and the cab 30 is arranged on the other side in the width direction. ing.

  The vehicle body 10 has wheels 11 and travels using an engine as a power source. Outriggers 12 are provided on both the left and right sides of the front and rear sides of the vehicle body 10 for lifting and supporting the vehicle body 10 during crane work.

  The crane device 20 includes a telescopic boom 21 that is provided so as to be able to be raised and lowered relative to the vehicle body 10 and that is telescopic.

  In the mobile crane 1, a counterweight 50 is detachably attached to the rear part of the swivel base 40, as shown in FIGS. 1 and 2, in order to obtain the stability of the vehicle body in a state where a load is suspended from the tip of the telescopic boom 21. It is attached to.

  The counterweight 50 includes a plurality of plate-like weights 51 stacked on each other, and block-shaped weights 52 connected to both sides in the width direction of the stacked weights 51. When attaching / detaching the counterweight 50 to / from the rear part of the swivel base 40, such as an operation of connecting a hose to the hydraulic actuator or an operation of connecting the weight 52 to the weight 51, the upper surface of the weight 51 attached to the swivel base 40 There is a situation of work at high places where workers work.

  As shown in FIG. 3, an operator who performs work at a high place on the upper surface of the weight 51 attached to the rear part of the swivel base 40 uses a fall prevention device 60 provided on the outer periphery of the weight 51.

  The fall prevention device 60 includes a support member 61 for hooking a safety belt, a base member 62 fixed to the weight 51, a connecting member 63 for connecting the support member 61 and the base member 62, and a support member in the retracted posture. And a support member 64 for supporting the distal end side of the member 61 from below.

  The column member 61 is made of a cylindrical member having an axial dimension of about 1 meter, for example, and as shown in FIGS. 3 to 5, a hook locking portion 61a for hooking a safety belt hook is provided at the tip portion. As shown in FIG. 6, the base end portion is provided with a fitting portion 61 b that fits into a column holding portion described later of the base member 62. Further, in the vicinity of the fitting portion 61b of the support member 61, a protrusion 61c that restricts the movement in the circumferential direction and the axial direction within a predetermined range with respect to a support-side connection portion of the connection member 63 described later is provided. .

  As shown in FIG. 6, the base member 62 holds the connecting member 63 in the vertical direction and the column support on the outer peripheral side of the column holding unit 62a and the cylindrical column holding unit 62a into which the fitting unit 61b of the column member 61 is fitted. A pair of guide portions 62b for guiding in the radial direction of the portion 62a. A long hole 62b1 through which a connecting shaft 63c (described later) of the connecting member 63 passes is formed in the pair of guide portions 62b. The long hole 62b1 includes a linear portion 62b2 that extends obliquely upward from the radial outer side to the inner side of the support column holding portion 62a, and a work position holding portion 62b3 that is bent from the upper end portion of the linear portion 62b2 and extends obliquely downward. .

  As shown in FIGS. 4 to 6, the connecting member 63 includes a support-side connecting portion 63 a connected to the support member 61 and a base-side connecting portion 63 b connected to the base member 62.

  The column-side connecting portion 63a is formed in a cylindrical shape, and the base end side of the column member 61 is connected. A long hole 63a1 that extends in the axial direction and extends in the circumferential direction from both ends in the axial direction is formed in the column-side connecting portion 63a, and the protrusion 61c of the column member 61 is movable within the range of the long hole 63a1.

  As shown in FIG. 6, the long hole 63a1 includes a straight portion 63a2 extending in the axial direction of the support column side connecting portion 63a, a storage posture holding portion 63a3 that bends in a circumferential direction from an end portion on the distal end side of the straight portion 63a2, And a working posture holding portion 63a4 that bends in the circumferential direction and extends in the axial direction from the proximal end of the portion 63a2.

  In other words, the column member 61 is movable within the range of the length of the linear portion 63a2 in the axial direction with respect to the column side connecting portion 63a when the protruding portion 61c is positioned at the linear portion 63a2. Further, when the protruding portion 61c is positioned in the retracted posture holding portion 63a3, the support member 61 is restricted from moving in the axial direction, and the state in which the fitting portion 61b is positioned on the inner peripheral side of the support column side connecting portion 63a is maintained. . Further, when the protrusion 61c is positioned at the work posture holding part 63a4, the support member 61 is restricted from moving in the axial direction, and the fitting part 61b is held in a state of protruding from the base end part of the support side connecting part 63a. The

  The base side connecting portion 63b is formed in a pair of plates extending radially outward from the outer peripheral portion on the base end side of the column side connecting portion 63a, and the connecting shaft 63c is inserted into the elongated holes 62b1 of the pair of guide portions 62b of the base member 62. It is connected via. The connecting member 63 is movable with respect to the base member 62 within the range of the long hole 62 b 1 and is swingable with respect to the base member 62.

  That is, as shown in FIG. 6, when the connecting shaft 63c is positioned at the straight portion 62b2 of the elongated hole 62b1, the connecting member 63 is movable in the radial direction and the vertical direction of the support column side connecting portion 63a with respect to the base member 62. It becomes. In addition, when the connecting shaft 63c is positioned at the work position holding portion 62b3 of the long hole 62b1, the connecting member 63 is restricted from moving downward and is held at the upper side of the base member 62.

  Further, when the connecting shaft 63c is rotated to the column holding portion 62a side of the base member 62 while the connecting shaft 63c is positioned at the work position holding portion 62b3 of the long hole 62b1, the connecting member 63 is rotated. The base end opening of the support column side connecting portion 63a is connected to the upper end opening of 62a.

  The support member 64 is fixed at a position spaced from the base member 62 in the outer peripheral portion of the plate-like weight 51. The support member 64 has a groove with a V-shaped cross section formed on the upper surface, and is supported in a state in which the front end side of the column member 61 is engaged with the V-shaped groove.

  As shown in FIG. 4, the fall prevention device 60 configured as described above has a posture in which the swing of the support member 61 is restricted with respect to the base member 62 with the tip end portion of the support member 61 facing upward. And a retracted posture that is a posture in which the restriction of the swing of the support member 61 is released with respect to the base member 62 and the tip end portion of the support member 61 is directed to the side, as shown in FIG. Can be switched.

  In the retracted posture of the fall prevention device 60, the protrusion 61c of the column member 61 is in contact with the retracted posture holding portion 63a3 of the elongated hole 63a1 provided in the column side connecting portion 63a of the connecting member 63, as shown in the upper part of FIG. positioned. Further, in the retracted posture of the fall prevention device 60, the connecting shaft 63c of the base side connecting portion 63b of the connecting member 63 is located at the lower end of the straight portion 62b2 of the long hole 62b1 provided in the guide portion 62b of the base member 62. Yes.

  When switching the fall prevention device 60 from the retracted position to the working position, the operator first holds the support member 61, lifts the lower end of the support member 61, and rotates the front end of the support member 61 upward. Let At this time, the connecting member 63 connected to the base end side of the column member 61 is oblique along the straight portion 62b2 of the long hole 62b1 of the pair of guide portions 62b of the base member 62, as shown in the middle stage of FIG. As shown in the lower part of FIG. 7, when the connecting shaft 63c is positioned at the work position holding portion 62b3 of the long hole 62b1, the vertical position of the base side connecting portion 63b is determined. In addition, the column-side connection portion 63 a of the connection member 63 is positioned above the column holding portion 62 a of the base member 62.

  Next, the operator rotates the column member 61 in one circumferential direction while grasping the column member 61. At this time, the support member 61 has the protrusion 61c moved from the retracted posture holding portion 63a3 of the elongated hole 63a1 to the straight portion 63a2, and the restriction of the downward movement is released. As shown in the upper part of FIG. It moves downward by its own weight. When the column member 61 moves downward, the fitting portion 61b located at the base end of the column member 61 is fitted into the column holding portion 62a of the base member 62, and the swinging of the column member 61 is restricted.

  Finally, the worker rotates the other end in the circumferential direction while holding the support member 61. At this time, as shown in the lower part of FIG. 8, in the support member 61, the protrusion 61c moves from the straight part 63a2 of the elongated hole 63a1 to the work posture holding part 63a4, and the upward movement is restricted.

  That is, the operator can switch the column member 61 from the retracted posture to the working posture by operating the column member 61 with one hand.

  On the other hand, when switching the fall prevention device 60 from the working posture to the retracted posture, the worker first holds the column member 61 and rotates the column member 61 in the other circumferential direction while lifting the column member 61. At this time, the protrusion 61c moves from the working posture holding portion 63a4 of the elongated hole 63a1 to the straight portion 63a2 in the support member 61, and the restriction on the upward movement is released as shown in the upper part of FIG.

  Next, the operator lifts the strut member 61 upward while holding it, and then rotates it in one circumferential direction. At this time, when the column member 61 moves upward, the column member 61 has a fitting portion 61b located at the base end of the column member 61 disengaged from the column holding unit 62a of the base member 62, and the column member 61 swings. Regulations are lifted. Further, as shown in the lower part of FIG. 7, the protrusion 61 c moves from the straight part 63 a 2 to the storage posture holding part 63 a 3 and the downward movement of the support member 61 is restricted.

  Finally, the operator rotates the tip end of the column member 61 toward the side while holding the column member 61 and moves the base end side of the column member 61 to the side. At this time, the connecting shaft 63c of the connecting member 63 moves along the long hole 62b1 as shown in the middle part of FIG. 7, and from the work position holding part 62b3 to the lower end of the linear part 62b2 as shown in the upper part of FIG. Move to the department.

  That is, the operator can switch the column member 61 from the working posture to the retracted posture by operating the column member 61 with one hand.

  Further, when the fall prevention device 60 is switched from the working posture to the retracted posture, the connecting member 63 moves downward, so that the vertical dimension of the column member 61 can be reduced in the retracted posture.

  Thus, according to the fall prevention device of the present embodiment, the base end side of the column member 61 moves within a predetermined range in the vertical direction in a state where the restriction of the swing of the column member 61 with respect to the base member 62 is released. The base member 62 is connected to the base member 62 so as to be positioned below the working posture in the retracted posture.

  Thereby, since the overall height dimension of the fall prevention device 60 can be reduced in the retracted posture, the fall prevention device 60 can be installed in a place where the upward projecting dimension is limited, and the column member It is possible to improve work efficiency for making the column member 61 workable without separately requiring a place for storing 61.

  Further, the column member 61 is controlled to swing by moving it downward from the upper end side of the range movable in the vertical direction with respect to the column side connecting portion 63a with the tip portion facing upward, and the lower end side. The movement is released from the restriction by moving it upward.

  Thereby, since it is possible to switch between swing restriction and release of the swing restriction by a simple operation by the operator, the work efficiency of switching work between the storage posture and the work posture of the pillar member 61 can be improved. It becomes possible to improve.

  Further, the column member 61 is rotated in the circumferential direction with respect to the column side coupling portion 63a, thereby moving downward from the upper end side of the movable range and moving upward from the lower end side of the movable range. Is regulated.

  As a result, only by moving the support member 61 in the vertical direction, the restriction of the swinging of the support member 61 and the release of the control of the swinging are not switched. Therefore, the safety can be improved without switching between the regulation of the movement and the release of the regulation of the swing.

  In the above-described embodiment, the crash prevention device 60 is provided on the plate-like weight 51 of the counterweight 50 used for the crane work of the mobile crane 1. However, the present invention is not limited to this. For example, it may be an upper part of a vehicle body of a mobile crane as long as it is a place where work at a high place occurs. Further, the crash prevention device is not limited to a mobile crane, and may be applied to, for example, a truck vehicle having a loading platform.

  Moreover, in the said embodiment, although the support | pillar member 61 which has the hook latching | locking part 61a for hooking the hook of a safety belt as the fall prevention apparatus 60 was shown, it is not restricted to this. For example, the strut member may have a master rope locking portion for locking the master rope on which the hook of the safety belt is hung.

  Further, in the above-described embodiment, the base end side of the column member 61 is moved in the vertical direction with respect to the base member 62 by moving the connecting member 63 along the long hole 62 b 1 formed in the guide portion 62 b of the base member 62. Although what was made to move was shown, it is not restricted to this. For example, the base end side of the column member 61 may be moved in the vertical direction with respect to the base member 62 by connecting the column member 61 and the base member 62 with a link-shaped member.

  50 ... counter weight, 51 ... weight, 60 ... falling prevention device, 61 ... post member, 61a ... hook engaging portion, 61b ... fitting portion, 61c ... projection portion, 62 ... base member, 62a ... post support portion, 62b ... guide part, 62b1 ... long hole, 62b2 ... straight line part, 62b3 ... work position holding part, 63 ... connecting member, 63a ... column-side connecting part, 63a1 ... long hole, 63a2 ... straight part, 63a3 ... storage posture holding part, 63a4: working posture holding section, 63b: base side connecting section, 63c: connecting shaft.

Claims (3)

A base member fixed to the installation location;
A locking member that locks the hook of the safety belt or the master rope at the distal end, and a support member whose base end is swingably connected to the base member;
The support member has a working posture in which swinging with respect to the base member is restricted with the tip portion facing upward, and a retracted posture in which the restriction of swinging with respect to the base member is released and the tip portion is directed sideways. Switching is possible,
The base end side of the column member is connected to the base member so as to be movable within a predetermined range in the vertical direction in a state where the restriction of the swing of the column member with respect to the base member is released, and is lower than the working posture in the retracted posture A fall-prevention device. The support member is connected to the base member via the connecting member,
The connection member has a support side connection part connected to the support member, and a base side connection part connected to the base member,
The base side connecting portion is connected to the base member so as to be movable and swingable within a predetermined range in the vertical direction.
The support column side connecting portion is connected to the base end side of the support member so as to be movable within a predetermined range in the axial direction of the support member.
The strut member is restricted from swinging by moving downward from the upper end side of the range where it can move in the vertical direction with respect to the strut-side connecting portion with the tip portion facing upward, and moves upward from the lower end side. The fall prevention device according to claim 1, wherein the restriction of swing is released. The column member is rotated in the circumferential direction with respect to the column-side connecting portion, so that the movement from the upper end side of the movable range to the lower side and the movement from the lower end side of the movable range to the upper side are restricted. The crash prevention device according to claim 2.