JP2005001799A - Forklift device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow a vertical attitude of a fork to be altered. <P>SOLUTION: This forklift device is provided with a mounting platform 3 mounted on a front part of a tractor 2, a lift frame 5, a lower part of which is pivotally supported by the mounting platform 3 so as to be oscillated around a lateral axis 4, a fork platform 7 vertically movably supported by the lift frame 5 and provided with the fork 6, a raising/lowering means 8 provided to the lift frame 5 to raise and lower the fork platform 7, and a tilting means 9 provided between the lift frame 5 and the mounting platform 3 to tilt the lift frame 5 around the lateral axis. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a forklift device attached to a front portion of a tractor.
[0002]
[Prior art]
In this type of prior art, the forklift device configured to hold the fork of the forklift substantially horizontally and to be folded upright can be detachably mounted on the balance weight mounting part at the front of the tractor. (For example, refer to Patent Document 1).
[0003]
[Patent Document 1]
JP 2001-341989 A.
[0004]
[Problems to be solved by the invention]
In the prior art, the forklift is detachable from the front part of the tractor. However, the forklift is not structured to be tilted with a fixed front / rear posture, and it is difficult to prevent the load from falling off the fork.
An object of the present invention is to provide a forklift device that can solve such problems of the prior art.
An object of the present invention is to provide a forklift device that can change the vertical posture of a fork by allowing a lift frame to be tilted about a horizontal axis with respect to a mounting base at a front portion of a tractor.
[0005]
[Means for Solving the Problems]
Specific means for solving the problems in the present invention are as follows.
First, a mounting base 3 attached to the front portion of the tractor 2, a lift frame 5 whose lower part is pivotally supported around the horizontal axis 4 on the mounting base 3, and can be moved up and down by the lift frame 5. A fork base 7 that is supported and has a fork 6, a lifting / lowering means 8 that is provided on the lift frame 5 to raise and lower the fork base 7, and is provided between the lift frame 5 and the mounting base 3. And tilt means 9 for tilting the frame 5 about the horizontal axis.
[0006]
As a result, when the lift frame 5 is tilted around the horizontal axis 4 with respect to the mounting base 3 at the front of the tractor, the vertical position of the fork 6 is changed, and the fork 6 can be easily crushed against the load. It can prevent the load from dropping off.
Secondly, the lower part of the mounting table 3 and the lower part of the lift frame 5 are detachable in the front-rear direction via a horizontal shaft 4, and the tilt means 9 is manually operated and detachably supported on the mounting table 3. Is.
Accordingly, the lift frame 5 can be attached to and detached from the mounting base 3, and the tilt means 9 for tilting the lift frame 5 can be configured at low cost.
[0007]
Thirdly, the tilt means 9 is supported by the nut member 11 provided on the lift frame 5, the screw member 12 supported by the mounting base 3 and screwed with the nut member 11, and supported by the tractor 2. And an operating member 13 that rotates the screw member 12, and the operating member 13 extends to the vicinity of the steering device 14 of the tractor 2.
As a result, the tilt means 9 can be operated from the tractor 2 and can be configured at low cost.
Fourthly, the forward tilt check means 15 of the lift frame 5 is provided between the upper part of the mounting table 3 and the lift frame 5.
[0008]
As a result, the lift frame 5 can be prevented from falling forward.
Fifthly, the fork 6 has a support member 16 mounted on the fork base 7 and a fork member 17 projecting forward from the support member 16, and the fork member 17 is supported on the rear part in the front-rear direction and in the middle part. It is to have a mounted portion 44b detachably attached to the lower part of the member 16.
As a result, the fork 6 can perform a normal fork operation by attaching the rear part of the fork member 17 to the support member 16, and the fork member 17 is grounded by attaching the middle part of the fork member 17 to the support member 16. In this state, the lift frame 5 can be prevented from falling forward and backward, and the lift frame 5 can be detached from the mounting base 3 and placed in a standing posture.
[0009]
Sixth, the fork 6 is mounted on the fork base 7 in a pair of left and right, and at least one of the forks 6 protrudes outward from the hood 18 of the tractor 2 in the left-right direction.
As a result, the fork 6 can be visually observed from above the tractor 2 without being obstructed by the bonnet 18, and the fork workability can be improved.
Seventhly, the elevating means 8 includes a chain 19 having one end connected to the lift frame 5 and the other end connected to the fork base 7, and a constant sprocket 20 provided on the lift frame 5 and meshing with a middle portion of the chain 19. A pair of dynamic sprockets 21 that mesh with the chain 11 on both sides of the constant sprocket 20 and a lifting body 22 that supports the same, and a lifting drive device 23 that is provided on the lift frame 5 and lifts the lifting body 22. It is to have.
[0010]
As a result, the fork 6 can be lifted and lowered at four times the stroke and four times as fast as the lifting and lowering operation of the lifting and lowering drive device 23, and the work performance of the fork 6 can be improved.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the first embodiment shown in FIGS. 1 to 5, reference numeral 1 denotes a fork wrist device attached to the tractor 2. The fork wrist device is roughly divided into a mounting base 3 attached to the front portion of the tractor 2 and pivotally supported by the mounting base 3. A lift frame 5, a fork base 7 having a fork 6, lifting and lowering means 8 for the fork base 7, and tilt means 9 for the lift frame 5 are provided.
The mounting table 3 is formed by connecting a pair of left and right side-view plate-shaped plate members with a horizontal connecting member, and is mounted on the front axle frame of the tractor 2 or the front portion of the front axle frame indicated by reference numeral 28. The front weight mounting base is bolted.
[0012]
A horizontal shaft 4 is penetrated and attached to the lower portion of the mounting base 3, and an arc-shaped long groove 30 with the horizontal shaft 4 as the center of curvature is formed at the upper portion. A tool 50 and a bearing member 53 are provided.
The lift frame 5 is formed in a ladder shape by connecting a pair of left and right vertical rails 32 with an upper member 33U, a lower member 33D, a middle lower member 33M, and a middle upper member 33N. The arms 34 protrude and a pair of left and right upper mounting arms 35 protrude rearward from the middle lower member 33M.
[0013]
Each of the left and right lower mounting arms 34 is formed with a rear open recess 34a at the rear end of the square tube member. The recess 34a is inserted through the mounting base 3 and fitted to the left and right protruding ends of the horizontal shaft 4 from the front. The lower portion of the lift frame 5 is pivotally supported about the horizontal axis 4 with respect to the mounting base 3.
By removing the retaining pin 36, the lower part of the lift frame 5 can be attached to and detached from the mounting base 3 in the front-rear direction. However, it is also possible to attach and detach the upper and lower parts by making the opening direction of the recess 34a of the lower mounting arm 34 upward and downward.
[0014]
Each of the left and right upper mounting arms 35 is formed of a plate material having a substantially triangular shape when viewed from the side, and is fixed to the middle / lower member 33 </ b> M, and its rear portion is fitted to both ends of a connecting pin 37 penetrating the long groove 30. The upper mounting arm 35, the mounting base 3 having the long groove 30, the connecting pin 37, and the like limit the function of supporting the lift frame 5, the function of guiding the swing of the lift frame 5, and the swing angle of the lift frame 5. Although it has the function to perform, it constitutes the forward tilt check means 15 which checks that the lift frame 5 falls forward.
Instead of the upper mounting arm 35, the long groove 30, and the connecting pin 37, the mounting base 3 and the upper mounting arm 35 may be connected by a chain or the like as the forward tilt check means 15.
[0015]
Each of the left and right vertical rails 32 of the lift frame 5 is a channel material having a substantially C-shaped cross section arranged so that the groove 32a faces outward. The inside of the groove 32a is a rail surface, and a fork stand Seven rollers 7a are arranged to be able to roll.
The fork base 7 is formed in a rectangular shape by connecting the left and right ends of the upper and lower horizontal members 39U and 39D with the side end members 40, and the upper and lower horizontal members 39U, A leg member 41 for connecting 39D is provided in a rearward protruding shape, and a pair of upper and lower rollers 7a are provided on the opposing inner surfaces of the left and right leg members 41.
[0016]
The fork 6 includes a support member 16 mounted on the fork base 7 and a fork member 17 protruding forward from the support member 16. Each of the left and right support members 16 is disposed between a side end member 40 and a leg member 41 of the fork base 7, and the support member 16 is connected to the fork base 7 by a pair of upper and lower pins 42 penetrating these three members. is doing.
Each of the support members 16 is formed by welding a pair of left and right L-shaped members 16B to the lower portion of a prismatic or square pipe-shaped main body 16A, and a mounting portion 43 for the fork member 17 is disposed below the left and right L-shaped members 16B. Is formed. The mounting portion 43 is formed by a pin hole 43a located immediately below the main body 16A and an engaging portion 43b formed by penetrating the pin at a position forward of the main body 16A.
[0017]
The fork member 17 is formed of a prismatic material or a square pipe material, and the tip is formed in a tapered shape. The fork member 17 has attached portions 44 formed at the rear and middle portions in the front-rear direction, and each attached portion 44 has a pin hole 44a and an engaging recess 44b.
The fork member 17 has a rear portion inserted between the lower portions of the left and right L-shaped members 16B of the support member 16, the mounting portion 43 and the rear mounted portion 44 are opposed to each other, and a connecting pin 45 is provided in both pin holes 43a and 44a. It connects by making it penetrate and engaging the engaging recessed part 44b with the engaging part 43b. As a result, the fork member 17 is set in the fork working posture, and the fork member 17 can be raised at the front centered on the connecting pin 45 and is received downward by the engaging portion 43b.
[0018]
Further, a midway portion of the fork member 17 is inserted between the lower portions of the left and right L-shaped members 16B of the support member 16, the mounting portion 43 and the midway mounting portion 44 are opposed to each other, and the connecting pin 45 is connected to both pin holes 43a and 44a. , The fork member 17 is set in a standing posture, and the fork wrist device 1 is separated from the tractor 2 and placed alone on the ground. I will be able to keep. When the fork wrist device 1 is placed alone on the ground, the lower end of the support member 16 is grounded to prevent forward tilting, and the rear half of the fork member 17 is grounded to prevent backward tilting.
[0019]
Further, when the fork 6 is lifted and the connecting pin 45 is removed from the fork working posture, the fork member 17 can be rotated around the engaging portion 43b, and the fork member 17 is placed along the entire surface of the fork base 7. You can
A pair of left and right forks 6 are mounted on the left and right side portions of the fork base 7 and project outward from the bonnet 18 of the tractor 2 to the left and right. If at least one of the left and right fork members 17 protrudes left and right outward from the bonnet 18, the fork 6 can be visually observed without being obstructed by the hood 18 during fork work.
[0020]
The elevating means 8 includes a chain 19, a constant sprocket 20 and a pair of dynamic sprockets 21 that mesh with the chain 19, an elevating body 22 that supports the dynamic sprocket 21, an elevating drive device 23 that elevates and lowers the elevating body 22, and the like. Yes.
One end of the chain 19 is connected to the lift frame 5 and the other end is connected to the fork base 7, respectively, and a midway portion is wound around the fixed sprocket 20 provided on the middle and lower members 33 </ b> M of the lift frame 5 and meshes. . A pair of moving sprockets 21 that move up and down are arranged on both the front and rear sides of the fixed sprocket 20, and the moving sprocket 21 is engaged with the chain 11 on both sides of the engagement of the fixed sprocket 20. That is, one dynamic sprocket 21 is disposed between the lift frame 5 and the constant sprocket 20, and one dynamic sprocket 21 is disposed between the fork base 7 and the constant sprocket 20.
[0021]
The pair of dynamic sprockets 21 are rotatably supported by an elevating body 22, and the elevating body 22 is connected to the upper end of an expansion / contraction mechanism 47 of the elevating drive device 23.
The elevating drive device 23 is attached to the middle lower member 33M and the middle upper member 33N of the lift frame 5, and includes a screw jack type expansion / contraction mechanism 47 and a drive unit 48 for extending / contracting the expansion / contraction mechanism 47. The driving device 48 is a motor that is supplied with electricity from the power source of the tractor 2 via a harness and can be controlled from above the tractor 2, and is configured to drive the screw shaft of the telescopic mechanism 47 via a gear.
[0022]
When the expansion / contraction mechanism 47 is expanded / contracted by operating the driving device 48 of the lifting / lowering driving device 23, the two dynamic sprockets 21 are simultaneously lifted / lowered via the lifting / lowering body 22, which is four times the lifting stroke of the dynamic sprocket 21. The fork stand 7 is moved up and down at a speed four times the distance.
The tilt means 9 is manually operated and is detachable from the mounting base 3. The tilt means 9 includes a nut member 11 provided on the lift frame 5, a screw member 12 screwed with the nut member 11, and an operation member 13 that rotates the screw member 12.
[0023]
The nut member 11 is fixed to the inner surface side of the right vertical rail of the lift frame 5, and the screw member 12 is threaded through the nut member 11 in the front-rear direction.
The rear part of the screw member 12 is rotatably supported by a pivot member 49, and the pivot member 49 can be rotated about the horizontal axis and detachable by a receiver 50 mounted on the right plate of the mounting base 3. It is supported by. The pivot member 49 is prevented from coming off by a cover 54 attached to the receiving member 50.
A universal shaft 51 is connected to the rear end of the screw member 12 via a universal joint. The rear end of the universal shaft 51 is fitted into a transmission shaft 52 and is connected to be freely connected and disconnected via a pin 58.
[0024]
The transmission shaft 52 is rotatably supported by a bearing member 53 provided at the right front portion of the mounting base 3, and the rear end of the transmission shaft 52 is connected to the operation member 13 through a universal joint.
The operating member 13 is a rotary handle having a handle portion 13a at the rear end, extends to the vicinity of the steering device 14 of the tractor 2, and is supported by a handrail member 55 provided on the left and right side portions of the steering device 14. The operation member 13 is rotatably supported by the support 56.
[0025]
The support 56 is provided with a switch 57 for operating the elevating drive device 23 at a position close to the handle portion 13a.
The operation member 13 is disposed along the right side surface of the bonnet 18, the transmission shaft 52 and the universal shaft 51 are inclined from the right side surface toward the center of the tractor 2, and the screw member 12 is disposed in the front-rear direction.
The operation member 13 can be operated from above the tractor 2. By operating this operation member 13, the screw member 12 rotates, and the lift frame 5 is pushed back and forth via the nut member 11, so that the lift frame 5 is Tilt operation around the horizontal axis.
[0026]
The receiving member 50 has an upwardly opened vertical claw shape, and can support the circular portions of the left and right portions of the pivotal support member 49 by inserting them from above. The universal shaft 51 and the transmission shaft 52 are connected to each other. The pin 58 is removed, and the pivot member 49 is detached from the support 50, so that the relationship between the screw member 12 and the tractor 2 can be cut off. When the lift frame 5 is separated from the mounting base 3, the tilt is The main member of the means 9 can be deposited on the fork wrist device 1 side.
The work of the fork wrist device 1 according to the first embodiment is as follows. The fork 6 is lowered to a grounded state and inserted into a pallet on which a load is placed, and the fork 6 is lifted through the lifting means 8 to lift the load to a required height. After that, the tractor 2 is moved to transport the package to the destination.
[0027]
When inserting the fork 6 into the pallet, if necessary, the handle 13a of the tilting means 9 is rotated to tilt the lift frame 5 forward and tilt, so that the fork 6 is tilted forward and downward. When it is likely to slide forward from 6, the handle 13 a is rotated to cause the lift frame 5 to tilt backward and tilt the fork 6 backward and downward.
7 and 8 show a second embodiment, and the structures of the lifting means 8 and the tilt means 9 are substantially the same as those of the first embodiment.
[0028]
The mounting base 3 bolted to the front of the tractor 2 has a horizontal shaft 4 passing through the upper part and a connecting pin 37 penetrating through the lower part, and the upper mounting arm 35 of the lift frame 5 is provided in the middle / lower member 33M. The lower mounting arm 34 is provided on the lower member 33D, and a long groove 30 through which the connecting pin 37 passes is formed.
Thus, the forward tilt check means 15 is formed by the long groove 30 of the lower mounting arm 34 and the connecting pin 37, and the lift frame 5 can be tilted back and forth around the horizontal axis 4 at the top of the mounting base 3.
[0029]
The horizontal shaft 4 is formed by concentrically fixing the cylinder shaft to the left and right plate members of the mounting base 3 or by penetrating the shaft in the fixed left and right cylinder shafts, as in the first embodiment. Alternatively, it may be formed by a single shaft. .
In addition, a horizontal connecting plate 60 that connects the left and right side plates is provided on the top of the mounting base 3, and one end of the chain 19 is connected to the horizontal connecting plate 60, and serves as an end fixed to the lift frame 5. Since the horizontal connecting plate 60 is located in the vicinity of the horizontal axis 4, the movement of the chain 19 due to the tilting operation of the lift frame 5 is almost negligible.
[0030]
The support member 16 of the fork 6 is disposed on the front side of the fork base 7, the upper part of the support member 16 is pin-connected to the upper horizontal member 39U of the fork base 7, and the middle part abuts the front surface of the lower horizontal member 39D. ing.
A mounting portion 43 having two pin holes is formed in the L-shaped lower portion of the support member 16, and a mounted portion 44 having two pin holes is also formed in the rear portion and the middle portion of the fork member 17. The fork member 17 is connected by fitting the L-shaped lower part of the support member 16 to the fork member 17 and penetrating the two connecting pins 45.
[0031]
The fork member 17 can be moved along the front surface of the fork base 7 as shown by a two-dot chain line in FIG. A holding tool 61 that holds the posture along the fork base 7 using the pin hole of the mounted portion 44 is provided.
One end of the holder 61 is pivotally supported by the support member 16, and a pin hole is formed at the other end. The other end is overlapped with the fork member 17, and the connecting pin 45 is pulled out from the lower portion of the support member 16. By using the connecting pin 45 to penetrate the other end of the holder 61 and the fork member 17, the fork member 17 can be held in a retracted posture along the fork base 7.
[0032]
In the second embodiment, the intermediate mounting portion 44 is omitted, and only the pin hole for the connecting pin 45 penetrating the fork member 17 and the holder 61 in the retracted position is formed. The lower mounting arm 34 protrudes horizontally from the lower end of the lift frame 5 so that if the lower end of the lift frame 5 and the fork 6 are grounded simultaneously, the fork wrist device 1 is placed on the ground in a standing posture. It becomes possible to do.
In the present invention, the shape of each member and the positional relationship between the front, back, left, and right in the above embodiment are best configured as shown in FIGS. However, the present invention is not limited to the first and second embodiments, and members and configurations can be variously modified and combinations can be changed.
[0033]
For example, a hydraulic cylinder can be used for the lifting / lowering means 8 and / or the tilting means 9, or the fork 6 can be mounted to the fork base 7 so that the left and right mounting positions can be freely adjusted.
[0034]
【The invention's effect】
According to the present invention described in detail above, the vertical position of the fork can be changed by tilting the lift frame about the horizontal axis with respect to the mounting base at the front of the tractor, and the fork scooping operation with respect to the load can be performed. It can be done easily, and the fallen baggage can be prevented more reliably.
[Brief description of the drawings]
FIG. 1 is an overall side view showing a first embodiment of the present invention.
FIG. 2 is a side view of a main part.
FIG. 3 is a front view.
FIG. 4 is a plan view.
5 is a partial cross-sectional front view as seen from the X direction in FIG. 4;
FIG. 6 is a perspective view showing a transmission portion of the tilt means.
FIG. 7 is a side view showing a second embodiment.
8 is a partial cross-sectional front view as seen from the Y direction in FIG. 7;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Fork wrist device 2 Tractor 3 Mounting base 4 Horizontal axis 5 Lift frame 6 Fork 7 Fork base 8 Lifting means 9 Tilt means 11 Nut member 12 Screw member 13 Operation member 14 Steering device 15 Front-prevention restraining means 16 Support member 17 Fork member 18 Bonnet 19 Chain 20 Constant sprocket 21 Dynamic sprocket 22 Lifting body 23 Lifting drive device

Claims (7)

A mounting base (3) mounted on the front portion of the tractor (2), a lift frame (5) whose lower part is pivotally supported around the horizontal axis (4) on the mounting base (3), and the lift A fork base (7) having a fork (6) supported by the frame (5) so as to be movable up and down; and a lifting means (8) provided on the lift frame (5) for raising and lowering the fork base (7); A forklift device provided with a tilt means (9) provided between the lift frame (5) and the mounting base (3) for tilting the lift frame (5) about the horizontal axis. The lower part of the mounting base (3) and the lower part of the lift frame (5) are detachable in the front-rear direction via a horizontal axis (4), and the tilting means (9) is manually operated and the mounting base (3 The forklift device according to claim 1, wherein the forklift device is detachably supported. The tilt means (9) includes a nut member (11) provided on the lift frame (5), a screw member (12) supported by the mounting base 3 and screwed into the nut member (11), and a tractor ( 2) and an operating member (13) that rotates the screw member (12), and the operating member (13) extends to the vicinity of the steering device (14) of the tractor (2). The forklift device according to claim 2. The forward tilt check means (15) of the lift frame (5) is provided between the upper part of the mounting base (3) and the lift frame (5). Forklift equipment. The fork (6) has a support member (16) mounted on the fork base (7) and a fork member (17) projecting forward from the support member (16). The forklift device according to any one of claims 1 to 4, further comprising a mounted portion (44b) that is detachably attached to a lower portion of the support member (16) at a rear portion and a midway portion. A pair of left and right forks (6) are mounted on a fork base (7), at least one of which protrudes outward from the hood ((18) of the tractor (2) in the left-right direction. The forklift device according to any one of 1 to 5. The elevating means (8) includes a chain (19) having one end connected to the lift frame (5) and the other end connected to the fork base (7), and the lift frame (5). A fixed sprocket (20) meshing with the midway part, a pair of moving sprockets (21) meshing with the chain (11) on both sides of the constant sprocket (20), an elevating body (22) supporting this, and a lift frame ( The forklift device according to any one of claims 1 to 6, further comprising an elevating drive device (23) provided in 5) for elevating and lowering the elevating body (22).

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