JPH0213435Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application: The present invention relates to a front confirmation device for loading a forklift.

Conventional technology: Generally, when driving a forklift to load cargo onto the fork, or carrying it to a destination and unloading it, the forward view is obstructed by the cargo, so the driver has to In order to achieve this, they have to drive in an awkward position, forcing them to overwork. This is extremely inconvenient and dangerous, especially in the case of large luggage, as the forward view is almost obstructed and a guide is required. As a measure to overcome this drawback, various systems have been proposed for forward confirmation devices equipped with mirrors that allow the driver to freely and safely load and unload luggage from the driver's seat. For example, there are methods in which multiple mirrors are attached to appropriate positions on the mast and the front view is visually confirmed through these reflecting mirrors (for example, Utility Model Publication No. 51-35810, Utility Model Application Publication No. 55-71941), and lenses and A method in which the driver can see the front view by combining it with a reflector (Utility Model Publication No. 51-40595), or a mirror is attached to the tip of a telescope-shaped arm that is attached to the top of the driver's seat guard and can be extended and retracted horizontally. (Jikko No. 52-4666), and a fulcrum is attached to the top of the driver's seat guard so that the mirror can be positioned in front to see the front when needed, and when not needed, it can be reversed and moved to the rear. A system in which a mirror is attached to the tip of the arm with a structure like this (Utility Model Publication No. 51-25314,
Jitko No. 51-35738, Jitko No. 52-4667), etc. However, regarding these prior art,
In the case of a system using a plurality of mirrors, it is structurally difficult to grasp the exact situation, and if the direction of the mirror shifts due to vibration, it is troublesome to correct. Furthermore, when using a lens, there are problems such as the situation cannot be grasped accurately due to lighting conditions, the device is expensive, and the field of view is specified and difficult to correct. The method described above is naturally convenient in that it can be installed in a position that does not interfere with loading and unloading cargo, but with a mirror attached to the tip of the arm, it is difficult to install the mirror after loading the cargo onto the fork mast or when loading and unloading the cargo. Since the arms often get in the way, they are designed to be inverted or extend/contract, but with these methods, the structure tends to be complicated, and if you try to simplify it, the inversion operation that involves swinging a long arm is required. This naturally places restrictions on where it can be used, which is inconvenient if the arm is repeatedly used temporarily or not, and if the arm is left protruding, it may become a foreign object during operation. Since there is a risk of damage if it comes into contact with it, it must have the ability to be stored.

Purpose of the invention: The present invention solves such problems, and when the driver needs to visually check the condition of the front position depending on the cargo, the mirror mounting arm can be pushed forward and the driver can move the mirror from the driver's seat. For forklifts with a simple configuration that ensures visibility, and when no longer needed, can be stored along the guard part within the vehicle width and height range of the lift truck, and the height position of the mirror can be set arbitrarily up or down. The purpose of the present invention is to provide a forward confirmation device.

Structure of the invention: In the present invention, a forward confirmation device for a forklift in which the base of the driver's seat guard of the forklift is supported at an appropriate position and a viewing mirror is positioned in front of the loading area via an arm. is folded at the middle part, and the base arm on the rear half side is rotatably supported at the base by a support shaft attached to the driver's seat guard side, and a rotation shaft is supported at the tip of the base arm. The base end of the front arm is fixed to this, and a wrapped conduction band such as a chain or a toothed belt is wound between the gear fixed to the rotating shaft and the gear on the fixed shaft supporting the rear half base of the arm. A driving means is attached to the base end of the arm, and by rotating the base arm by a required rotation angle, the front arm is formed to bend and move back and forth through the gear on the rotation shaft at the wrapped conduction band. A cylindrical shock absorber is installed between the base arm and the guard frame at a suitable position so that the rod end is located at the rear of the line connecting the support shaft and the pivot point during folding, and the fixed gear is connected to the base. It is fixed by a fitting fixing mechanism that can be fixed at a required rotational angle position with a face plate provided with a metal fitting, and the mirror height position when the arm is extended can be changed by selecting the fixing position of the fixed gear.

In the mirror support arm of the present invention, when the driving means, for example, the operating lever attached to the arm base, is pulled down, the rear arm rotates about the fixed support shaft, and the rotation shaft upper gear attached to the tip of the arm rotates.
It rotates according to the displacement of the chain or toothed belt wound around the fixed gear, and the rotation of the rotating shaft causes the front half arm to be rotated and extended from the storage position to a predetermined protruding position, and is connected to the arm base. The cylinder-type shock absorber acts as a buffer and keeps the arm extended, and a mirror attached to the end of the arm allows the driver in the driver's seat to see the forward position of the forklift. It is. Note that the fixed gear and the movable gear are set at a required gear ratio (generally, a gear ratio of 1:2 is preferable) so that the bending/extending speed becomes faster.

In addition, a large number of pin holes are drilled in the fixed gear attached to the base with the required allocation, and by changing the engagement position with the pin protruding from the base fixed to the guard side, the tip of the arm, that is, The height position of the mirror can be changed, and the arm conditions can be arbitrarily adjusted depending on the work.

Embodiment: Next, the device of the present invention will be described in detail with reference to one embodiment, as shown in FIGS. , by fixing the mounting base metal fitting 14, attaching the base of the arm 10, which has a length such that the tip of the arm 10 in the extended state protrudes from the mast 4 to a position in front of the article placed on the loading platform 5, which can be raised and lowered along the front surface; The arm 10 includes a rear base arm 11 that can be bent at an intermediate position and a front arm 1 that can be bent at an intermediate position.
2, the tip of the arm 10 (front arm 12) is appropriately bent, and a convex mirror 13 is attached thereto in an adjustable manner.

In the arm 10, the base end of the base arm 11 is pivotally supported on a fixed shaft 14' attached to the base metal fitting 14, and a rotation shaft 15 is connected to the distal end of the base arm 11 via a take-up 15'. It is attached,
A chain wheel 16 and a base end 12' of the front arm 12 are fixed to this rotation shaft 15. An endless chain 18 is wound around the chain wheel 17 fixed to the base metal fitting 14 and the chain wheel 16 on the rotating shaft 15 in a tensioned state, and the tooth ratio of both the chain wheels 16 and 17 is fixed. The chain wheel 16 on the movable side is related to the wheel 17 so that it is 1/2 the size. The front arm 12 has its tip 12'' bent in the direction of the traveling center line of the forklift vehicle body 1, and a convex mirror 13 is adjustably attached to this bent portion 12'' via a mounting bracket 13'. be.

In addition, at a position near the base end of the base arm 11, the end of a rod 31 of a compressed air cylinder type shock absorber 30, whose lower end is pivotally connected to the guard frame 3 on the upper part of the vehicle body 1 via a mounting bracket 6, is connected with a pin. An operating lever 19 is attached to the rear portion of the base arm 11.

In addition, the chain wheel 17 fixed to the base metal fitting 14 has
Multiple pin holes 1 equally divided on the circumference drawn with the required diameter
7' is bored, and two pins 21 implanted in a predetermined size in the face plate 20 fixed to the base metal fitting 14 are inserted into the pin holes 17' of the chain wheel 17, and the chain wheel 1
7 is fixed. This fixed chain wheel 17
can be moved in the axial direction together with the base arm 11 by removing the mounting nut at the end of the fixed shaft 14', and the fitting position can be changed by disengaging from the pin 21 embedded in the face plate 20. It's summery.

In the device of the present invention configured in this way, when the driver wants to visually check the state of the front position of the loading platform 5 when loading and unloading cargo, the driver can pull down the operating lever 19 and the initial chain line will be displayed. The arm 10, which had been folded and stored in the state shown in Fig.
9 rotates the base end of the base arm 11 around the shaft 14', which acts to lift the tip of the base arm 11. However, due to the winding displacement of the chain 18 on the side of the fixed chain wheel 17, the chain 18 is rotated counterclockwise in the figure, and as a result, the base end is attached to the rotation shaft 15 fixed to the chain wheel 16. The supported front arm 12 also rotates,
Arm 1 with its tip protruding forward
0 is extended. At this time, the rod 31 of the shock absorber 30 connected to the base end of the base arm 11
is actuated in the extension direction past the most compressed position and acts to cause the arm 10 to move into the extended state.

In this way, the driver can visually check the front position of the loading platform 5 through the mirror 13 at the preset angle of the mirror 13 from the driver's seat. Therefore, you can work without losing your posture while checking the situation under your feet when accepting cargo with a fork, or the range of movement in front of you when unloading cargo.

Therefore, there is no need to check the front, and when retracting the protruding mirror 13, by pushing up the operating lever 19 in the opposite direction, the lever 19 and the base arm 11 will be affected by the protruding force of the rod 31 of the shock absorber 30. The chain wheel 16 is rotated downward by the winding chain 18.
is rotated clockwise in the figure, the front arm 12 fixed on the coaxial 15 is rotated clockwise, the arm 10 is folded, and the guard frame 3 is placed in the front position as shown by the chain line in Figure 1. It will be folded in half and stored. At this time, the shock absorber 3
Since the connecting end of the rod 31 is located behind the straight line a connecting the pivot point 32 and the fixed shaft 14' which is the reference point for supporting the arm 10, the compression reaction force is generated when the arm 10 is folded. The arm 10 is maintained in the retracted state unless the arm 10 is extended. Therefore, in this state, the front confirmation device is stored in a low-volume manner and does not interfere with normal operation in any way.

Since the forward confirmation device of the present invention has the above-described configuration, when it is desired to change the visibility state, the arm base is unfixed and the pin hole 1 of the fixed chain wheel 17 is opened.
By changing the position 7' and engaging the pin 21 on the face plate 20 side, the front arm 12 can be made higher as shown in Fig. 6, or lowered as shown in Fig. 7. Mirror 1 when the arm is extended
You can also change the position of 3.

Alternatively, the arm can be bent and extended manually by fixing a gear to the base of the arm and using a motor to drive a small gear that meshes with the gear. Alternatively, the same effect can be achieved by operating the arm with a fluid pressure cylinder. In addition, the chain wound between the chain wheels 16 and 17 may be connected at its intermediate portion with a rod, if necessary. Further, a toothed belt may be used instead of the chain, and a gear meshing with the belt may be used instead of the chain wheel. The chain wheel (gear) ratio is not limited to 1:2, and may be any other ratio. Furthermore, a balance weight may be attached to the arm base.

Effects of the invention: According to the invention, even with a simple configuration, the driver's seat guard frame extends forward only when necessary and allows the driver to check the front position of the cargo area using a mirror while driving. If there is a risk that the protruding mirror and its supporting arm may become an obstacle when driving, it can be stored low-volume along the guard frame by operating from the driver's seat, and the arm can be bent and extended with only a small amount of effort. This means that it can be quickly bent and stretched by a dynamic operation, and since this operation is performed on the side of the cargo mast, it can be bent and stretched without being restricted by the surrounding situation. It is also possible to change the conditions of the arm by appropriately angularly displacing the fixed gear (chain wheel) at the base of the arm, and the simple structure means that it can be used conveniently without breaking down, which has a great practical effect. It can be said that there is.

[Brief explanation of the drawing]

Fig. 1 is an overall front view of the forward confirmation device of the present invention, also showing how it is stored, Fig. 2 is a plan view, Fig. 3 is a partially cutaway detailed view of the arm base, and Fig. 4 is a detailed view of the arm base.
FIG. 5 is a detailed sectional view of the connecting portion between the front arm and the base arm, and FIGS. 6 and 7 are diagrams showing modes when the state of the arm is changed. 1...Forklift vehicle body, 3...Guard frame, 5...Loading platform, 10...Arm, 11...
Base arm, 12...Front arm, 13...Mirror, 14...Base metal fitting, 14'...Fixed shaft, 1
5... Rotating shaft, 16... Movable chain wheel, 17... Fixed chain wheel, 17'... Pin hole, 18... Endless chain,
19... Operating lever, 20... Face plate, 21... Locking pin, 31... Rod, 30... Shock absorber.

Claims (1)

[Scope of utility model registration request] In a forklift forward confirmation device in which the base is supported on the driver's seat guard frame and a viewing mirror is positioned in front of the loading area via an arm, the arm is folded in the middle, and the base arm The base end is rotatably supported by a support shaft attached to the guard frame side, a rotation shaft is provided at the tip of the base arm, the base end of the front arm is fixed to this, and the rotation shaft A winding conduction band is wound between the gear fixed to the base arm and the fixed gear on the base arm support shaft, and a driving means is attached to the base end of the arm to rotate the base arm by a required rotation angle. The front arm is formed to bend forward and backward through a gear on the rotation axis using a wrapped conduction band, and connects the folding support axis and pivot point between the appropriate position of the base arm and the appropriate position of the guard frame. A cylindrical shock absorber is attached so that the rod end is located at the rear of the line, and the fixed gear is fixed with a fitting fixing mechanism that can be fixed at the required rotation angle position with the face plate attached to the base metal fitting, and the fixed gear is fixed. A forward confirmation device for a forklift, characterized in that the mirror height position when the arm is extended can be changed by position selection.