JP2004189427A - Safety guard of order picking lift - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safe guard of an order picking lift not obstructing loading/unloading of a cargo to a pallet and capable of certainly preventing an accident that an operator falls from the operator's seat or the pallet. <P>SOLUTION: The safety guard of the order picking lift is provided with a left member 12 surrounding a left side and a rear side of a space above the pallet scooped up on the operation seat 3 and a fork 5; and a right member 13 surrounding a right side and a rear side of the space when it is horizontally positioned. The safety guard is provided with lateral frame parts 12b, 13b having base ends of the left and right members 12, 13 independently and turnably supported on the operator's seat 3 around left and right axes; and rear frame parts 12c, 13c horizontally extended from the tip end to the neighborhood at the opposite side of the space. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a safety guard for an order picking lift provided to prevent an accidental fall of an operator.
[0002]
[Prior art]
In general, in an order picking lift, a cab is supported on a mast erected on a body frame so as to be able to move up and down, and a fork is fixed to the cab. The cab and fork are driven up and down by a lift cylinder supported by the body frame, and the fork is advanced by moving the cab and fork forward together with the body frame at a predetermined height close to the running surface. After being inserted into the pallet, the pallet is lifted and scooped on a fork. The operator gets on the driver's cab to control the running of the vehicle body and the raising and lowering of the driver's cab and the fork. To unload.
[0003]
In order to ensure safety during such work, for example, as shown in the following document, side guards are provided on both left and right sides of the cab to prevent an operator from falling down to the left and right sides of the cab, A rear guard is provided to prevent the operator from falling from the rear of the cab to the fork. In addition to the order picking lift, the guard surrounding the space above the work floor is divided into right and left parts even in a high place work vehicle, and each part has an open position where it stands upright and a use position where it lays horizontally. There has been proposed a guard device capable of rotating over a range (see the following document).
[0004]
In addition, although not an order picking lift, forklifts have been developed that allow the operator to lift and lower the fork on a pallet picked up by a fork. And the gate-shaped protective frame (guard) along the upper edge can be rotated between an open position (storage position) that overlaps the backrest in side view and a use position (set position) that projects almost horizontally to the tip of the fork. Some are provided (see the following literature).
[0005]
[Reference 1]
JP-A-8-113486
[Reference 2]
JP-A-9-151090
[Reference 3]
6-27884
[Reference 4]
JP-A-10-250995
[0006]
[Problems to be solved by the invention]
According to the conventional general order picking lift, the side guard and the rear guard can prevent the operator from falling off the cab, but since there is nothing caught by the operator around the pallet scooped by the fork, the safety is secured. Unless a belt or the like is worn, there is a problem that the operator may fall off the pallet even if the operator slightly loses balance.
[0007]
When the protection frame described in JP-A-10-250995 is applied to an order picking lift, the driver's cab and the pallet are surrounded by the protection frame in plan view, and the operator can be prevented from falling off the driver's cab and the pallet. There is a problem that the protective frame hinders the loading / unloading of the load between the loading table (rack) and the pallet.
[0008]
The present invention provides a safety guard for an order picking lift that can reliably prevent an operator from falling off a cab and a pallet, and that allows an operator to load and unload cargo on a pallet without being obstructed by the safety guard. The purpose is to provide.
[0009]
[Means for Solving the Problems]
To achieve this object, the present invention provides a safety guard for an order picking lift in which a cab and a fork are integrally moved up and down, and a pallet scooped up by the cab and the fork when positioned horizontally. A left member surrounding the left side and the rear side of the space that extends over the upper part, and a right member surrounding the right side and the rear side of the space when positioned horizontally, and these left and right members each have a base end. A horizontal frame portion rotatably supported around the left and right axes independently of each other on the left side or the right side of the cab, and extends horizontally from the tip of the horizontal frame portion to the vicinity on the opposite side of the space. And a rear frame portion.
[0010]
According to this, by raising or hanging the member on the loading table (rack) side from its base end, the side surface of the space on the loading table (rack) side is opened and opposite to the loading table (rack). By arranging the member on the side horizontally, it is possible to obtain an effect that the entire length of the space on the side opposite to the loading table (rack) and substantially the entire length on the rear side can be surrounded by the member. Further, when the left and right members are located at the use position, an effect that the left and right sides and the rear side of the space can be surrounded by both members can be obtained. In addition, what can expand and contract in the axial direction can be used as the said horizontal frame part, In this case, adjust or adjust a horizontal frame part to the optimal length with respect to several types of pallets with different length. can do.
[0011]
In addition, the base end of the horizontal frame portion can be rotatably supported by a cab via a hollow or solid shaft that expands and contracts in the direction of the rotation axis. It is possible to optimally adjust or adjust the horizontal position of the horizontal frame portion for each type of pallet. Of course, in this case, in order to prevent the operator from falling down, it is preferable to use the rear frame portion that can expand and contract in the axial direction. Further, the base end of the horizontal frame portion may be rotatably supported on a driver's cab so as to be slidable in the direction of the rotation axis. In this case, a plurality of types of pallets having different widths may be supported. The position of the horizontal frame in the left-right direction can be adjusted or adjusted optimally. Of course, in this case, in order to prevent the operator from falling down, it is preferable to use the rear frame portion that can expand and contract in the axial direction.
[0012]
By the way, in the present invention, it is preferable to provide left and right use state holding means for individually holding the left and right members at the use position in order to secure the falling prevention effect of each member or both members. The use state holding means may be configured to individually hold the left or right member in the use position. For example, one of the member and a member of the driver's cab supporting the base end of the member may be used. And a protrusion provided on the other side, which protrudes into the recess when the left or right member is located at the use position, and biasing means for biasing the protrusion in the protruding direction. And a positioning means consisting of: Further, urging means for urging the left or right member to a use position, for example, a gas spring, a compression coil spring, a tension coil spring, a torsion coil spring, a spiral spring, and the member urged by the urging means The use state holding means may be constituted by the check means for controlling the use position. However, instead of these urging means, the left or right member may be urged to the use position by its own weight. As the restraint means, a stopper fixed to a member of a driver's cab supporting a base end of the left or right member, receiving the left or right member at a use position, and a winding end supported at one end by the driver's cab A strip body such as a wire or a chain wound around a reel and the other end connected to the left or right member, a strip body connected at one end to the upper part of the cab and the other end connected to the left or right member. One end is connected to the upper part of the cab, the other end is connected to the left or right member, a center-foldable link, one end is supported by the cab so as to be able to move up and down, and the other end is pivotally connected to the left or right member. A link with one end pivotally connected to the cab and one end slidably connected to the left or right member, a link with both ends pivotally connected to the cab and the left or right member, etc. Can be cited as an example. In addition, lock means for locking the left or right member in a use position may be used as use state holding means, and this lock means locks the left or right member in a use position by manual operation. May be used, and the left or right member may be locked in a use position by remote operation using a driving means such as a solenoid, and the left or right member may be moved to a use position. This may be detected by using a switch or a sensor, and the left or right member may be automatically locked to a use position by using a driving means such as a solenoid.
[0013]
Further, in the present invention, in order to prevent the member located at the open position from unexpectedly moving to the use position during loading / unloading of the pallet on the pallet, hindering the loading operation, and preventing contact with the operator. Preferably, left and right open state holding means for individually holding the left and right members at the open position are provided. The open state holding means may be configured so as to individually hold the left and right members in the open position. For example, the open state holding means is provided in a driver's cab and includes a catch in which the left or right member is fitted and detached. Or a recess provided on one of the left or right member and a member of the driver's cab supporting the base end of the member, and a projection provided on the other side so as to be able to advance and retreat toward the recess. When the left or right member is positioned at the open position, the positioning member may be constituted by urging means for projecting the projection into the recess. Further, urging means for urging the left or right member to the open position, such as a gas spring, a compression coil spring, a tension coil spring, a torsion coil spring, and a spiral spring, and the member urged by the urging means. The open state holding means may be constituted by the restraint means for restraining to the open position. As the restraint means, a stopper fixed to a member of a driver's cab supporting a base end of the left or right member and receiving the left or right member in an open position, a winding end supported at one end by the driver's cab Examples thereof include a wire wound around a reel and the other end connected to the left or right member, a strip such as a chain, and the like. In addition, lock means for locking the left or right member in the open position may be used as open state holding means. This lock means locks the left or right member in the use position by manual operation. May be used, and the left or right member may be locked in a use position by remote operation using a driving means such as a solenoid, and the left or right member may be moved to a use position. This may be detected by using a switch or a sensor, and the left or right member may be automatically locked to a use position by using a driving means such as a solenoid.
[0014]
Further, in the present invention, in order to facilitate the movement of the left or right member to the open position and / or the movement to the use position, the rotation of each of the left and right members is individually unidirectional or bidirectional. Preferably, an assisting means for assisting is provided, and particularly, an assisting means for assisting in lifting the left or right member is preferably provided. This assisting means may be configured to assist the rotation of each of the left and right members individually and bidirectionally, and is not particularly limited.In order to reduce the number of parts, the left or right member is used. It is preferable to also serve as urging means for individually urging to the use position and / or the open position.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
A safety guard of an order picking lift according to an embodiment of the present invention will be described below in detail with reference to the drawings.
[0016]
FIG. 1 is a side view of an order picking lift to which an embodiment of the present invention is applied. As shown in FIG. 1, the order picking lift is erected at an intermediate portion of a movable body frame 1 in the front-rear direction. The cab 3 is supported by the mast 2 so as to be able to move up and down, and the cab 3 is moved up and down by a lift cylinder 4 supported by the body frame 1. A fork 5 extending rearward is fixed to a lower portion of the cab 3. The cab 3 and the fork 5 are positioned at a predetermined height, the order picking lift is retracted, and the fork 5 is inserted into the pallet 6. After that, the driver's cab 3 and the fork 5 are raised to scoop the pallet 6 on the fork 5.
[0017]
The cab 3 includes a deck 7 on which an operator stands, right and left pillars 8 erected at both left and right corners of the front of the deck 7, and a head guard 9 fixed to upper ends of the left and right pillars 8. And a control device 10 for controlling the order picking lift is supported at an intermediate height between the right and left columns 8.
[0018]
FIG. 2 is a plan view of the order picking lift. The left and right pillars 8 support a safety guard 11 according to an embodiment of the present invention. As shown in FIG. When positioned horizontally, the left member 12 surrounding the left side and the rear side of the space that extends over the cab 3 and the pallet 6 scooped up by the fork 5 that moves up and down along with the cab 3 when the cab 3 is positioned horizontally There is a right member 13 surrounding the right side and the rear side of the space. These left and right members 12 and 13 are connected to rotating shafts 12a and 13a rotatably supported by the column 8 of the driver's cab 3 and base ends thereof are connected to left and right outer ends of the rotating shafts 12a and 13a. A horizontal frame portion 12b, 13b rotatably supported on the left or right side of the driver's cab 3 around a left and right axis independently of each other, and a side opposite to the space from a tip of the horizontal frame portion 12b, 13b. Is formed in an unequal-leg type including rear frame portions 12c and 13c extending horizontally to the vicinity of the upper frame. The left and right rotating shafts 12a and 13a are arranged coaxially and have different lengths of the left and right horizontal frame portions 12b and 13b so that the left and right rear frame portions 12c and 13c do not interfere with each other. .
[0019]
As shown in FIG. 1, a take-up reel 15 for winding a strip 14 made of, for example, a wire is supported above the left and right pillars 8, and the strip wound around the drum of the take-up reel 15 is supported. 14 are connected to the left and right rear frame portions 12c, 13c. The left and right members 12 and 13 are independently rotated by an own weight from an open position rising above a rotation axis and rotated downward, and the entire length of the strip 14 is fed out from the drum, so that the left and right members 12 and 13 are separated from each other. The use positions 12, 13 are restrained by the horizontal use position, and the left and right members 12, 13 are held at the use position.
[0020]
FIG. 3 is a rear view of the present invention when the left and right members 12 and 13 are located at the open position. As shown in FIG. Left and right catches 16 to be fitted and unloaded are supported, and when the left and right members 12, 13 are positioned at the open position, they are fitted to the catches 16 and held at the open position. As shown in FIG. 3, the left and right pillars 8 are connected by upper and lower horizontal rails 8a and 8b, and the rotating shafts 12a and 13a are supported by the upper and lower horizontal rails 8a and 8b to support the steering device 11. Are rotatably supported by left and right bearings 18 supported via the ribs 8c, and slidably in the direction of the axis of rotation.
[0021]
Although not shown, the take-up reel 15 has a built-in biasing means for biasing the drum in the take-up direction, such as a coiled coil spring or a spiral spring. The extra length of the strip 14 generated when the strip 14 is moved from the position to the open position is automatically taken up by the take-up reel 15. The urging means of the take-up reel 15 acts as an assisting means for assisting the operator's force to move the left or right member 12, 13 from the use position to the open position, so that the operator can operate the left or right member. The work of moving 12, 13 from the use position to the open position becomes easy.
[0022]
FIG. 4 is a longitudinal side view of the left bearing 18, and FIG. 5 is a front view thereof. As shown in these figures, the rotating shaft 12a is provided with a positioning groove at an appropriate distance in the axial direction. 12d and 12e are provided circumferentially, and the bearing 18 is fitted with a positioning lever 19 supported by the bearing 18 in a positioning groove 12d or 12e selected from the plurality of positioning grooves. The shaft 12a is supported by bearings 18 so as to be rotatable about its axis and axially positioned. As shown in FIG. 4, the rotary shaft 12a is formed of a U-shaped groove extending in the axial direction, and another positioning groove 12f, 12g, which is about twice as deep as the positioning grooves 12d, 12e, has a circumferential direction. Is formed at an angle of 90 °, and the projection 19a provided on the positioning lever 19 is inserted into the positioning grooves 12f and 12g selected from the above, so that the left member 12 is used or opened. Position.
[0023]
The positioning lever 19 is urged by an urging means 20 composed of, for example, a helical coil spring in a direction in which it is engaged with the positioning grooves 12d and 12e and the other positioning grooves 12f and 12g. When the rear end of the positioning lever 19 is lifted up as shown by the imaginary line A in FIG. 4 to separate from the positioning grooves 12d and 12e, the axial positioning of the rotary shaft 12a is released, and the left member 12a is pivoted. Can be moved in any direction. Further, when the rear end of the positioning lever 19 is lifted up against the urging means 20 as shown by the imaginary line B in FIG. 4 and the projection 19a is separated from the other positioning grooves 12f and 12g, the rotation shaft The left member 12 can be rotated between the use position and the open position by releasing the positioning of the 12a to the use position or the open position.
[0024]
The right bearing 18 and the rotating shaft 13a are configured in the same manner as the left bearing 18 and the rotating shaft 12b, and the positioning lever 19 can be operated to selectively position the right rotating shaft 13a in the axial direction. It is designed to be able to be positioned at the position.
[0025]
FIG. 6 is a plan view of the order picking lift to which this embodiment is applied and the loading table located on the left side thereof when handling. As shown in FIG. 6, the loading table 23 on the left side of the order picking lift and the pallet 6 The left member 12 is located at the open position and the right member 13 is located at the use position when the baggage is delivered. The rear frame portion 13c of the right member 13 is configured to be extendable and contractable. As shown in FIG. 2, when the left and right members 12, 13 are located at the use position (or open position), the rear frame portion 13c is shortened. The left and right members 12 and 13 do not interfere with each other. As shown in FIG. 6, when the left member 12 is located at the open position and the right member 13 is located at the use position, the rear frame portion 13c is extended so that the rear frame portion 13c and the loading table 23 are disposed. Is narrowed to a certain value or less.
[0026]
FIG. 7 is a plan view of the order picking lift to which the present embodiment is applied and a loading table located on the right side thereof when handling. As shown in FIG. When the baggage is transferred, the left member 12 is located at the use position and the right member 13 is located at the open position. The rear frame portion 12c of the left member 12 is configured to be extendable and contractable. As shown in FIG. 2, when the left and right members 12, 13 are located at the use position (or open position), the rear frame portion 12c is shortened. As shown in FIG. 7, when the left member 12 is located at the use position and the right member 13 is located at the open position, the rear frame portion 12c is extended and the rear member 12c and the loading table 23 are connected to each other. Are narrowed to a certain value or less.
[0027]
According to this embodiment, as shown in FIG. 6, in the case where the loading table (rack) 23 is on the left side, when the left member 12 is located at the open position, the space on the pallet 6 is opened to the left. Therefore, the cargo can be delivered between the loading table (rack) 23 and the pallet 6 without being hindered by the left member 12, while the right side of the space on the cab 3 and the pallet 6 and the space on the pallet 6 Since the rear is surrounded by the right member 13, it is possible to prevent the operator from falling to the right or rear of the cab 3 and the pallet 6. In particular, if the rear frame 13c of the right member 12 is extended to make the gap between the rear frame 13c and the loading table (rack) 23 equal to or less than a certain value, it is possible to more reliably prevent the operator from falling behind the pallet. In addition, as shown in FIG. 7, when there is a loading table (rack) 23 on the right side, when the right member 13 is located at the open position, the space on the pallet 6 is opened to the right. 13, the cargo can be delivered between the loading table (rack) 23 and the pallet 6, while the left side of the space on the cab 3 and the pallet 6 and the rear side of the space on the pallet 6 are left members. Since it is surrounded by 12, the operator can be prevented from falling to the right or behind the cab 3 and the pallet 6. In particular, when the rear frame portion 12c of the left member 12 is extended to make the gap between the rear frame portion 12c and the loading table (rack) 23 equal to or less than a certain value, it is possible to more reliably prevent the operator from falling behind the pallet.
[0028]
FIG. 8 is a side view of an order picking lift to which another embodiment of the present invention is applied. In this embodiment, the take-up reel 15 is omitted, and one end of the strip 14 is connected to the upper end of the column 8. Is done. When the left or right member 12, 13 is located at the open position, the slack of the strip 14 is connected, if necessary, at one end to the intermediate height of the column 8 and at the other end to the strip 14. The tension is released by the tension of the tension coil spring 24 engaged. The other configurations, operations and effects of this embodiment are the same as those of the above-described embodiment.
[0029]
FIG. 9 is a side view of an order picking lift to which another embodiment of the present invention is applied. In this embodiment, the left or right member 12, 13 is moved by its own weight from the open position to the use position. For this purpose, the horizontal frame portions 12b and 13b are bent in a "U" shape. The take-up reel 15 is composed of an electric reel, and by controlling the length of the strip 14 fed from the take-up reel 15, the left or right member 12, 13 is restrained to the use position. Is wound on the take-up reel 15, thereby returning the left or right member 12, 13 from the use position to the open position against the own weight. In the open position, the left or right member 12, 13 is held in the open position by pressing the left or right member 12, 13 against the stopper 25 supported by the column 8.
[0030]
The feeding amount of the strip 14 is measured using, for example, a length detecting means 26 composed of, for example, a potentiometer, a rotary encoder, or the like linked to a motor or a drum of the take-up reel 15. Alternatively, it is considered that the right members 12 and 13 are located at the use position or the open position, the take-up reel 15 is stopped, and the feeding or winding of the strip 14 is completed. However, the winding reel 15 is provided with load detecting means for detecting a load for winding the strip 14, and when the load detected by the load detecting means exceeds a predetermined value, the left or right member 12, 13 is moved to the open position. The take-up reel 15 may be stopped assuming that it is positioned, and the winding of the strip 14 may be terminated. The other configurations, operations and effects of this embodiment are the same as those of the above-described embodiment.
[0031]
FIG. 10 is a side view of an order picking lift to which still another embodiment of the present invention is applied. In this embodiment, instead of the strip 14, one end is pivotally mounted on the upper part of the column 8 and the other end is left. Alternatively, a center-foldable link 27 pivotally attached to the right members 12, 13 is used. Further, in this embodiment, an assisting means 28 composed of a gas spring is provided over the horizontal frame portions 12b and 13b of the left and right members 12 and 13 and the column 8, respectively. 13 is urged from the use position toward the open position, so that the left or right member 12, 13 can be easily moved from the use position toward the open position. The other configuration, operation and effect of this embodiment are the same as those of the other embodiments.
[0032]
In each of the above embodiments, the rotation axes of the left and right rotation shafts 12a and 13a are arranged coaxially. However, it is essential for the present invention to arrange the left and right rotation shafts 12a and 13a coaxially. Instead, the left and right rotation shafts 12a and 13a can be arranged parallel to each other, for example, shifted back and forth, or the left and right rotation shafts 12a and 13a can be arranged so that their rotation axes cross each other. is there. The positioning grooves 12d and 12e provided on the left and right rotation shafts 12a and 13a are not limited to two, but may be three or more. Further, in each of the above embodiments, the length of the horizontal frame portions 12b and 13b is fixed, but the horizontal frame portions 12b and 13b may be configured to be expandable and contractible.
[0033]
【The invention's effect】
As described above, according to the present invention, the side of the space on the loading table (rack) side is opened by raising or hanging the member on the loading table (rack) side from its base end. Therefore, the cargo can be handled without being hindered by the safety guard, that is, unloading from the pallet to the loading table (rack) and loading of the load from the loading table (rack) to the pallet. Also, by positioning the member on the side opposite to the loading table (rack) horizontally, an effect of surrounding the entire length of the driver's cab and the space on the side opposite to the loading table (rack) and substantially the entire length on the rear side with the member can be obtained. As a result, not only falling from the operator's cab but also falling from the pallet can be prevented, and the safety of the operator when handling the cargo can be ensured.
[0034]
In the present invention, when left and right use state holding means for individually holding the left and right members at a use position where the members are horizontal in a side view are provided, the left and / or right members are used state hold means. As a result, it is possible to reliably prevent the operator from falling off the cab and the pallet, and it is possible to obtain an effect that the operation of the order picking lift and the safety on the pallet can be improved.
[0035]
Further, in the present invention, when left and right open state holding means for individually holding the left and right members in an open position where the members rise or hang down in a side view are provided, the left or right member is in an open state. An effect that the holding means can be held at the open position can be obtained, which can prevent the left or right member from unexpectedly dropping from the open position to the use position to prevent the loading operation on the pallet. In both cases, it is possible to prevent the left or right member from unexpectedly dropping from the open position to the use position and to prevent contact with the operator, and it is possible to obtain effects such as enhancement of safety.
[0036]
Further, in the present invention, when assisting means for individually assisting the rotation of each of the left and right members in one direction or two directions is provided, the operation of moving the left or right member from the use position to the open position is performed. Alternatively, the operation of moving the left or right member from the open position to the open position and / or the operation of moving the left or right member from the open position to the open position are facilitated by the assisting means. Can be obtained.
[Brief description of the drawings]
FIG. 1 is a side view of an order picking lift to which the present invention is applied.
FIG. 2 is a plan view of an order picking lift to which the present invention is applied.
FIG. 3 is a rear view of the present invention.
FIG. 4 is a longitudinal sectional side view of a main part of the present invention.
FIG. 5 is a plan view of a main part of the present invention.
FIG. 6 is a plan view of an order picking lift to which the present invention is applied.
FIG. 7 is a plan view of an order picking lift to which the present invention is applied.
FIG. 8 is a side view of an order picking lift to which the present invention is applied.
FIG. 9 is a side view of an order picking lift to which the present invention is applied.
FIG. 10 is a side view of an order picking lift to which the present invention is applied.
[Explanation of symbols]
3 cab
5 fork
6 pallets
11 Safety guard
12 Left member
12b Horizontal frame
12c Rear frame
13 Right member
13b Horizontal frame
13c Rear frame

Claims (4)

A cab and a fork are safety guards of an order picking lift that moves up and down integrally,
A left member that surrounds the left and rear sides of a space that extends over the cab and the pallet scooped up by the fork when positioned horizontally, and a right and rear side of the space when positioned horizontally. And a right member surrounding the
These left and right members have their base ends respectively supported on the left side or right side of the cab independently rotatably around the left and right axis, and the space from the front end of the horizontal frame to the space. A rear guard portion extending horizontally to the vicinity of the opposite side, and a safety guard for the order picking lift. The safety guard of an order picking lift according to claim 2, further comprising left and right use state holding means for individually holding the left and right members at a use position where the members are horizontal in a side view. 4. The order picking lift according to claim 2, wherein left and right open state holding means for individually holding the left and right members in an open position where the members stand or hang down in a side view are provided. 5. Safety guard. 4. A safety guard for an order picking lift according to claim 2, further comprising an assisting means for individually and unidirectionally assisting rotation of each of said left and right members.

Images