JP3755868B2 - Reach type forklift - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reach type forklift having a deadman type brake.
[0002]
[Prior art]
FIG. 15 shows a perspective view of a reach type forklift 1 equipped with this type of deadman brake as viewed from the rear side. A mast device 3 that can move back and forth is provided at the front of the vehicle body 2 of the forklift 1, and a bracket 5 that fixes a pair of left and right forks 4 is provided on the front side of the mast device 3. A vehicle body 7 having a cab 6 is provided at the rear of the vehicle body 2, and various operation levers 8 and handles 9 are provided on the upper surface side of the vehicle body 7. Further, a head guard 10 for protecting the operator is disposed above the vehicle body 7.
[0003]
A driving motor and a driving device for driving and controlling the motor are disposed on the side of the cab 6, and a side cover 11 covering the driving device is provided to be opened and closed via a hinge portion. The end portion of the side cover 11 is provided with a hole-like handle portion 12, and in the case of daily inspection of a drive device or the like, the side cover 11 is opened by holding the handle portion 12, and after the inspection is finished, the side cover 11 is closed.
[0004]
FIG. 16 shows a configuration diagram of a brake link mechanism provided inside the vehicle body 7, and a brake pedal 14 is provided on the floor surface 13 of the cab 6 so as to be rotatable about a shaft 15. . The reach type forklift 1 employs a deadman type brake. The deadman type brake is released when the brake pedal 14 is depressed, and is applied when the foot is released from the brake pedal 14.
[0005]
The configuration of the brake link mechanism shown in FIG. 16 is as follows. That is, the lower end of the first link 16 is rotatably connected to the brake pedal 14 side via the shaft 17, and the upper end of the first link 16 is connected to the distal end side of the first connecting piece 20 via the shaft 21. And are pivotally connected. The first connecting piece 20, the second connecting piece 22 arranged in parallel with the first connecting piece 20, and the shaft rod 23 that bridges between the bases of the first connecting piece 20 and the second connecting piece 22. A substantially U-shaped connecting body 24 is formed. The shaft rod 23 of the connecting body 24 is rotatably connected to a fixing portion 25 that is bolted to the vehicle body 7 side.
[0006]
Further, the second connecting piece 22 of the connecting body 24 is rotatably connected to the lower end of the second link 26 by the shaft 27, and the upper end of the second link 26 is rotatable about the shaft 31 to the vehicle body 7 side. The lower end of the substantially L-shaped third link 32 supported by the shaft 30 and the shaft 30 are rotatably connected. Further, the substantially L-shaped fourth link 34 is rotatably arranged around a shaft 37, and one end of the fourth link 34 is rotatably connected to the upper end of the third link 32 by the shaft 33. . Furthermore, the other end (lower part in the drawing) of the fourth link 34 is provided with a protruding pressing portion 36 on both sides.
[0007]
On the other hand, a traveling motor 40 is disposed substantially at the center of the brake link mechanism, and a disk 41 is fixed to the output shaft of the motor 40. A brake device 42 is disposed so as to sandwich the disk 41 from above and below. The brake device 42 includes upper and lower pressing pieces 44 and 45 that are rotatably connected at one end side by a shaft 43, pads 46 and 47 disposed on opposing surfaces of the pressing pieces 44 and 45, and a pressing piece 44. , 45 is provided with a coiled spring 50 or the like that urges the other ends of the holding pieces 44, 45 inward. Bolts 51 and 52 are provided at the other ends of the pressing pieces 44 and 45 so as to be freely screwed. The tip surfaces of the bolts 51 and 52 are the tip surfaces of the pressing portions 36 and 36 of the driving unit 37. And abut each.
[0008]
The state shown in FIG. 16 is a state in which the brake is applied, and both the pressing pieces 44 and 45 are urged in the closing direction by the elastic force of the spring 50, and the upper and lower pads 46 and 47 cause the disk 41 to move from the upper and lower sides. It is sandwiched and mechanically braked. When the brake pedal 14 is stepped on, the first link 16 and the second link 26 are driven downward, whereby the third link 32 rotates about the shaft 31 in the counterclockwise direction. Further, the fourth link 34 rotates counterclockwise about the shaft 37 , and the pressing portions 36, 36 urge the bolts 51, 52, so that both pressing pieces 44, 45 are springs of the spring 50. It will open about the shaft 43 against the force. When the pressing pieces 44 and 45 are opened, the pads 46 and 47 are separated from the disk 41, and the brake is mechanically released. As a result, the forklift 1 can travel.
[0009]
[Problems to be solved by the invention]
As described above, the brake of the forklift 1 employs a deadman type, and conventionally, the brake can be mechanically released when the brake pedal 14 is depressed regardless of whether the power switch is on or off. Therefore, if the brake pedal 14 is accidentally stepped on when the side cover 11 is opened and inspected in order to perform daily inspection or the like in a place with a slope, the vehicle body 2 moves, which is very dangerous. there were.
[0010]
Further, although not directly related to the present application, for example, Japanese Utility Model Publication No. 63-29850 discloses that a forklift cannot be run unless the opening and closing of the battery cover is electrically detected and the battery cover is closed. What has been disclosed is disclosed. In the technique described in this publication, the reed switch detects that the battery cover is closed, thereby enabling the power switch to be turned on and driving by operating the key switch. However, with this technology, when the battery cover is open, even if you operate the key switch, the power switch does not turn on, so you cannot travel, so the operator can immediately determine what is causing the abnormality. First, it will be mistaken for an electrical failure of the motor. In such a case, it takes a long time to determine the cause of the failure.
[0011]
The present invention has been provided in view of the above points, and is a reach-type forklift that improves safety by preventing the brake from being released even when the brake pedal is stepped on when an exterior plate such as a cover is opened. It is intended to provide.
[0012]
[Means for Solving the Problems]
Therefore, in the reach type forklift of the present invention, a mast that can move back and forth in the front part of the vehicle body and a fork that can be moved up and down along the mast are provided, and a vehicle body having a cab is provided in the rear part of the vehicle body. In the reach forklift provided with an exterior plate that covers the interior of the vehicle body so as to be openable and closable in the vehicle body, and provided with a deadman type brake pedal in the cab,
A lock device is provided that locks the brake pedal to inhibit the push-down operation when the exterior plate is opened.
[0013]
With this configuration, when the exterior plate is open, even if the brake pedal is depressed, the brake pedal will not drop, so if you accidentally depress the brake pedal during inspection, etc., the brake will not be released. Can be performed. Also, if you forget to close the exterior plate after inspection, or if the exterior plate is open for some reason, turn on the power switch of the vehicle body and press the brake pedal to release the brake, the brake pedal will not lower Therefore, the operator immediately knows that it is not caused by at least an electrical failure, and there is an advantage that it is easy to notice that the cause is simply the opening of the exterior plate.
[0014]
In the reach type forklift according to claim 1, a rod body movable in a direction to open the exterior plate, a link piece having a substantially central portion pivotally supported and an upper portion rotatably coupled to the rod body, The link piece also has a function of applying a rotational biasing force to bias the rod body toward the open side of the exterior plate, and is positioned below the protrusion protruding from the brake pedal side when the exterior plate is opened. As described above, the lock device is configured by a lock portion provided at a lower portion of the link piece.
[0015]
As a result, when the exterior plate is opened, the lock part of the link piece is positioned below the protrusion on the brake pedal side, and even if the brake pedal is depressed, the protrusion engages with the lock part and restricts the depression of the brake pedal. Thus, it is possible to reliably prevent the brake from being released.
[0016]
In the reach-type forklift according to claim 2, a rod body movable in a direction to open the exterior plate, and the rod body and an upper portion are rotatably connected to apply a rotation biasing force to the open side of the exterior plate. The link piece, which is pivotally supported at the lower side, and the lock portion provided on the rod body so as to be positioned below the protrusion protruding from the brake pedal side when the exterior plate is opened, It is characterized by constituting an apparatus.
[0017]
As a result, when the exterior plate is opened, the lock part of the rod is positioned below the protrusion on the brake pedal side, and even if the brake pedal is depressed, the protrusion engages with the lock part and restricts the depression of the brake pedal. Thus, it is possible to reliably prevent the brake from being released.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Since the overall configuration of the forklift 1 and the configuration of the brake link mechanism are the same as those in the conventional art, elements that perform the same function are denoted by the same reference numerals, and description thereof is omitted. Will be described in detail.
[0019]
That is, as shown in FIG. 1, the present invention locks the brake link mechanism shown in FIG. 16 to lock the brake pedal 14 when the exterior plate such as the side cover 11 is opened to prevent the brake pedal 14 from being pushed down. A device 61 is added. As shown in FIGS. 1, 3 and 4, the locking device 61 includes a plate-like link piece 62 which is rotatably provided by a pin 53, and a protrusion-like lock provided at the lower part of the link piece 62. It is mainly comprised by the part 63 and the rod body 66 connected with the upper part of the link piece 62, and the axis | shaft 65 so that rotation was possible.
[0020]
As shown in FIG. 4, the pin 53 that pivotally supports the link piece 62 protrudes from the upper side surface of the support plate 54 erected from the floor surface 13, and a snap pin 55 is provided at the tip of the pin 53. The link piece 62 is pivotally supported by mounting. Further, the lock portion 63 provided at the lower portion of the link piece 62 is formed in a substantially trapezoidal shape, and a projection 64 projecting from the side surface of the first link 16 and the upper surface of the lock portion 63 are engaged as will be described later. It is like that. A connecting piece 67 is fixed to the base side of the rod body 66, and the connecting piece 67 and the upper part of the link piece 62 are rotatably connected via a shaft 65. Further, as shown in FIGS. 1 and 3A, the distal end surface of the rod body 66 is in contact with the inner surface of the side cover 11 closed on the vehicle body 7 side.
[0021]
In the state shown in FIG. 1, the position of the hole (not shown) of the link piece 62 that pivotally supports the pin 53 is perforated above the center in the longitudinal direction, and is provided at the lower part of the link piece 62. The lock portion 63 also serves as a weight, and the link piece 62 is biased counterclockwise about the pin 53. Therefore, the tip of the rod body 66 is always urged in the same direction as the opening direction of the side cover 11. When the side cover 11 is opened, the restriction by the side cover 11 is released, so that the rod body 66 moves to the left in FIG. 1 by the counterclockwise rotational urging force of the link piece 62.
[0022]
Since the rod body 66 moves in the left-right direction, a guide plate body 70 is provided more than the side cover 11 in order to stabilize the movement. That is, a pin 56 projects from the support plate 54, and the plate body 70 is pivotally supported on the pin 56 as in the case of the link piece 62, and the upper portion of the plate body 70 is connected to the connection piece 71 fixed to the rod body 66. The shaft 72 is rotatably connected. The plate body 70 is not particularly required, but a certain example is a preferred example. However, a member to be guided on the tip end side of the rod body 66 without providing the plate body 70 may be provided on the support plate 54 side.
[0023]
Next, the operation of the locking device 61 will be described. 1, 2 (a), 3 (a), and 5 (a) show a state in which the side cover 11 is completely closed to the vehicle body 7 side. The rod body 66 is urged to the right in the drawing. As a result, the link piece 62 is urged clockwise about the shaft 53, and the lock portion 63 of the link piece 62 and the protrusion 64 of the first link 16 are shifted laterally. Therefore, in this state, when the operator does not step on the brake pedal 14 (solid line in FIG. 3A), the motor 40 is braked as described above. Further, since the side cover 11 is completely closed, the lock portion 63 of the link piece 62 is located to the left of the protrusion 64 of the first link 16, so that when the operator steps on the brake pedal 14, the protrusion 64 does not contact the lock part 63, and the first link 16 can be lowered to release the brake.
[0024]
Next, when the side cover 11 is opened in the case of daily inspection as shown in FIG. 2 (b), the rod body 66 moves to the left as shown in FIG. 3 (b), and the link piece 62 is counterclockwise. Rotate to stop at a slightly inclined position. The position of the link piece 62 is a state in which the upper surface of the lock portion 63 is positioned below the protrusion 64 of the first link 16, and as shown in FIGS. 3B and 5B, Even when the brake pedal 14 is stepped on, the protrusion 64 engages with the upper surface of the lock portion 63 to prevent the brake from being released without depressing the brake pedal 14.
[0025]
As described above, when the side cover 11 is opened, even if the brake pedal 14 is depressed, the brake pedal 14 is not lowered. Even if the brake pedal 14 is accidentally depressed during the inspection, the brake is not released, and the daily inspection is performed safely. be able to. Also, if you forget to close the side cover 11 after inspection, or if the side cover 11 is open for some reason, the power switch of the forklift 1 is turned on and the brake pedal 14 is depressed to release the brake. Since the pedal 14 does not lower, there is an advantage that the operator can immediately know that it is not at least due to an electrical failure and that it is simply due to the opening of the side cover 11.
[0026]
By the way, in the state where the side cover 11 is opened, the link piece 62 is not in the vertical direction but is positioned in a slightly inclined state as shown in FIG. Therefore, when the vehicle is traveling with the brake pedal 14 released to release the brake, even if the side cover 11 is opened for some reason, the brake can be applied by acting as follows. . That is, in a state where the brake pedal 14 is depressed and the brake is released, the first link 16 is lowered, so that the protrusion 64 is positioned below the link piece 62 as shown in FIG. When the side cover 11 is opened in this state, the link piece 62 rotates counterclockwise and stops at a slightly inclined position. Therefore, when the foot is released from the brake pedal 14, the protrusion 64 is shown by the arrow in FIG. Therefore, the first link 16 can be lifted upward to apply a brake.
[0027]
FIG. 7 shows another example of the lock portion 63, which is formed in a substantially V-shape, and is configured to receive the projection 64 at the V-shaped portion on the upper surface of the lock portion 63 to prevent the release of the brake. It is. Similarly to the case of FIG. 6, even if the side cover 11 is opened, if the foot is released from the brake pedal 14, the protrusion 64 can move upward along the inclined lower surface of the lock portion 63 to apply the brake.
[0028]
(Second Embodiment)
A second embodiment will be described with reference to FIGS. In this embodiment, a lock portion 63 that engages with the protrusion 64 of the first link 16 is provided on the rod body 66. With the axial support position of the link piece 62 and the pin 53 set to the lower side of the link piece 62, the link piece 62 is always urged to rotate counterclockwise around the pin 53. Accordingly, the rod body 66 is always urged to the left in FIG. Similarly, the plate body 70 on the distal end side of the rod body 66 is urged so that the plate body 70 rotates counterclockwise with the axial support position of the plate body 70 and the pin 56 being the lower side.
[0029]
As shown in FIGS. 8A and 10A, when the side cover 11 is closed, the protrusion 64 of the first link 16 is positioned slightly forward of the lock portion 63 of the rod body 66, and the brake The brake can be released by depressing the pedal 14. When the side cover 11 is opened, as shown in FIG. 8B and FIG. 10B, the rod body 66 moves to the front side, so that the lock portion 63 is positioned below the protrusion 64. If the brake pedal 14 is stepped on in this state, the protrusion 64 of the first link 16 engages with the upper surface of the lock portion 63, so that the depression of the brake pedal 14 is restricted to prevent the brake from being released.
[0030]
Further, as shown in FIG. 11, even when the side cover 11 is opened and the lock part 63 comes above the protrusion 64 during traveling, the protrusion 64 is shown by the arrow in the figure when the foot is released from the brake pedal 14. Since it travels along the inclined side surface of the lock part 63, the first link 16 can move upward and brake.
[0031]
(Third embodiment)
In the previous embodiment, locking is performed by mechanical means, but in this embodiment, the locking device 61 is configured by electrical means. As shown in FIG. 12, the solenoid device 74 is turned on or off by a signal from a sensor 73 that detects opening / closing of the side cover 11, thereby causing the solenoid pin 75 to protrude, and the projection 64 of the first link 16 The brake is prevented from being released by engaging. The sensor 73 may be configured with a magnet 76 and a reed switch 77 as shown in FIG. 13A, or may be configured with a limit switch 78 as shown in FIG. 13B.
[0032]
Further, as shown in FIG. 14, by arranging the solenoid device 74 to be inclined, even if the side cover 11 is opened during traveling, the solenoid pin 75 that is inclined when the foot is released from the brake pedal 14. Thus, the protrusion 64 can move upward, so that the first link 16 can be restored and brakes can be applied.
[0033]
In each of the above embodiments, when the side cover 11 is opened, the locking device 61 is driven so that the brake is not released. However, as an exterior plate of the vehicle body 7, in addition to the side cover 11 Even when the front cover or the battery cover is opened, the lock device 61 may be driven so that the brake is not released.
[0034]
【The invention's effect】
According to the reach type forklift of the present invention, when the exterior plate is open, even if the brake pedal is stepped on, the brake pedal will not be lowered. Daily inspections can be performed. Also, if you forget to close the exterior plate after inspection, or if the exterior plate is open for some reason, turn on the power switch of the vehicle body and press the brake pedal to release the brake, the brake pedal will not lower Therefore, the operator immediately knows that it is not caused by at least an electrical failure, and there is an advantage that it is easy to notice that the cause is simply the opening of the exterior plate.
[0035]
According to the reach type forklift according to claim 1 , when the exterior plate is opened, the lock portion of the link piece is located below the protrusion on the brake pedal side, and the protrusion engages with the lock portion even when the brake pedal is stepped on. Thus, the brake pedal can be prevented from being released by restricting the depression of the brake pedal.
[0036]
According to the reach type forklift according to claim 2 , when the exterior plate is opened, the lock portion of the rod body is located below the protrusion on the brake pedal side, and the protrusion engages with the lock portion even when the brake pedal is depressed. Thus, the brake pedal can be prevented from being released by restricting the depression of the brake pedal.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a brake link mechanism to which a locking device according to an embodiment of the present invention is added.
FIGS. 2A and 2B are a perspective view of a vehicle body with a side cover closed according to an embodiment of the present invention, and a perspective view with a side cover opened. FIG.
FIG. 3A is an explanatory view showing a state where the lock of the lock device according to the embodiment of the present invention is released.
(B) is explanatory drawing which shows the state which has locked the brake pedal with the locking device of embodiment of this invention.
FIG. 4 is a side view of the locking device according to the embodiment of the present invention.
FIGS. 5A and 5B are explanatory views showing a locked state according to the embodiment of the present invention. FIGS.
FIG. 6 is an explanatory diagram when the brake is applied during traveling according to the embodiment of the present invention.
FIG. 7 is a diagram showing another example of the lock unit according to the embodiment of the present invention.
FIGS. 8A and 8B are explanatory views showing a locked state according to the second embodiment of the present invention. FIGS.
FIG. 9 is a side view of a locking device according to a second embodiment of the present invention.
FIGS. 10A and 10B are explanatory views showing a locked state according to the second embodiment of the present invention. FIGS.
FIG. 11 is an explanatory diagram when braking is applied during traveling according to the second embodiment of the present invention.
FIG. 12 is a diagram when the locking device according to the third embodiment of the present invention is configured by electrical means.
FIGS. 13A and 13B are diagrams showing types of sensors according to the third embodiment of the present invention. FIGS.
FIG. 14 is an explanatory diagram when braking is applied during traveling according to the third embodiment of the present invention.
FIG. 15 is a rear perspective view of the reach type forklift.
FIG. 16 is a configuration diagram of a conventional brake link mechanism.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Forklift 2 Car body 3 Mast apparatus 4 Fork 6 Driver's cab 7 Vehicle main body 11 Side cover 14 Brake pedal 16 First link 61 Locking device 62 Link piece 63 Locking part 64 Protrusion 66 Rod body

Claims (2)

A mast that can move back and forth and a fork that can move up and down along the mast are provided at the front of the vehicle body, and a vehicle body having a cab is provided at the rear of the vehicle body. In a reach-type forklift provided with an exterior plate that can be freely opened and closed and provided with a deadman type brake pedal on the cab, a locking device that locks the brake pedal and suppresses a push-down operation when the exterior plate is opened The locking device includes a rod body that is movable in a direction to open the exterior plate, a link piece that is pivotally supported at a substantially central portion, and an upper portion that is rotatably coupled to the rod body, and the link piece. It also has a function of applying a rotational biasing force to bias the rod body toward the open side of the exterior plate, and is positioned below the protrusion protruding from the brake pedal side when the exterior plate is opened. Reach truck, characterized in that is constituted by a locking portion provided in a lower portion of the link piece. A mast that can move back and forth and a fork that can move up and down along the mast are provided at the front of the vehicle body, and a vehicle body having a cab is provided at the rear of the vehicle body. In a reach-type forklift provided with an exterior plate that can be freely opened and closed and provided with a deadman type brake pedal in the cab, a locking device that locks the brake pedal and depresses the push-down operation when the exterior plate is opened And the lock device is configured so that a rod body movable in a direction to open the exterior plate, and the rod body and an upper portion are rotatably connected to apply a rotational biasing force to the open side of the exterior plate. and the lower side axially supported by the link piece, constructed with a lock portion provided on the rod so as to be positioned below the projections projecting from the brake pedal side when the outer casing is opened Reach forklift and butterflies.

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