JP3071251U - Auxiliary drive unit for hand lifter - Google Patents

Abstract

(57) [Summary] [Problem] To provide an auxiliary drive unit device capable of reliably driving and driving a hand lifter irrespective of unevenness on the ground, at low cost. SOLUTION: As an auxiliary drive unit device for a hand lifter, left and right rear wheels 1a, 1b are pivotally supported on an axle 11 via a bearing 10, and the axle 11 is rotated around a pin 12 in the front-rear direction with respect to the longitudinal axis 2. A motor base 13 is fixedly attached to the longitudinal axis 2 while being pivotably attached to the longitudinal axis 2, and a drive rotating means 15 is provided on a base portion behind the rear wheel so that the output shaft 14 is oriented in the left-right direction. 1
A chain-type transmission means 16 is provided over the output shaft 14 and one of the left and right rear wheels 1a.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to an auxiliary drive unit device for a hand lifter used for, for example, transporting a pallet on which a heavy object is placed.

[0002]

[Prior art]

 As a hand lifter, the base of a fork with lifting wheels at its tip is connected to a base with left and right rear wheels rotatable about the vertical axis so that it can be raised and lowered, and stands upright at the base of the fork. A drive means for raising and lowering the fork base and the ascending and descending wheels in series is provided between the upper side of the bracket and the base, and a steering handle is provided in relation to the longitudinal axis.

[0003] In this hand lifter, the fork is inserted into the opening of the pallet in a state in which the base side of the fork and the lifting wheel are lowered in series by a driving means, that is, with the whole fork lowered above ground. In this case, the fork and the pallet are lifted by the driving means, and the steering handle is pushed and pulled by human power to move the pallet on which the heavy object is placed.

[0004]

[Problems to be solved by the invention]

 However, moving the hand lifter requires a great deal of force and is inefficient, so the inventors of the present invention supported the axle 52 via the bearing 51 as shown in FIG. One of the left and right rear wheels 53a, 53b was connected to an auxiliary drive unit 54 by a motor, and attempted to easily carry a pallet on which heavy items were placed.

However, one of the left and right rear wheels 53a formed as drive wheels approaches a concave portion on the ground, and the other left and right rear wheel 53b rides on a convex portion, so that the drive rear wheel 53a rises. If this happens, the rear wheel 53a idles, resulting in the inconvenience of pushing and pulling by human power.

As a technique for solving this, it is conceivable to provide auxiliary driving unit devices by motors on the left and right rear wheels, respectively. However, since there are two auxiliary driving unit devices, control becomes difficult, and There is a problem in that the cost is greatly increased.

The present invention has been made in view of such circumstances, and has as its object to take the form of a single-sided drive that is inexpensive and inexpensive to drive only one of the left and right rear wheels. Another object of the present invention is to provide an auxiliary drive unit device for a hand lifter that enables driving and running irrespective of unevenness of the hand lifter.

[0008]

[Means for Solving the Problems]

 That is, in the present invention, as an auxiliary drive unit device for a hand lifter, the left and right rear wheels are supported on an axle via bearings, and the axle is pivotally attached to the longitudinal axis so as to be tiltable about a longitudinal pin. On the other hand, a base is fixed to the vertical axis, and a drive rotating means is provided on the base portion behind the rear wheel of the base so that the output shaft is oriented in the left-right direction. It is characterized in that a chain type transmission means is provided over one rear wheel (claim 1).

According to the above configuration, the axle and thus the left and right rear wheels tilt around the pins so as to follow the unevenness of the ground, and the left and right rear wheels are always in contact with the ground. While taking the form of driving, the hand lifter can be reliably driven and driven.

[0010] At this time, the drive rotation means is arranged behind the rear wheels, and the left and right rear wheels are driven by a chain-type transmission means. The inclination of the axle when following is absorbed by the twisting of the chain, and does not cause any driving problems.

[0011] As the base, there is provided a plate portion mounted on the axle connection pin and a vertical axis holding means for holding the vertical axis portion above the axle connection pin (claim 2). By using the connecting pin, the base can be firmly fixed to the upper and lower two points of the axle.

Alternatively, as a base, a fixed base having a plate portion mounted on the axle connecting pin and a vertical axis holding means for holding a vertical axis portion above the axle connecting pin, It consists of a movable base pivotally attached to the rear side so as to be swingable about the horizontal axis in the left-right direction, and the drive rotation means is mounted on the movable base, while the chain tension means is provided over both bases. (Claim 3) In addition to the firm fixing of the base using the axle connecting pin, the chain tensioning means can be easily configured by using a part of the base, that is, the movable base.

The chain tensioning means includes a bolt provided on one of the fixed base and the movable base, and a nut screwed to the bolt to swing the movable base in the chain tensioning direction. , And can be configured at low cost.

[0014]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows, for example, a hand lifter used for transporting a pallet on which a heavy object is placed. The hand lifter is provided on a gantry 3 provided with left and right rear wheels 1a and 1b rotatable about a vertical axis (see FIG. 3) 2. The base side of the fork 5 having the lifting wheel 4 at its tip is connected via a link 6 so as to be able to ascend and descend, and the upper side of the bracket 7 erected on the base side of the fork 5 and the gantry 3 are connected. A drive means 8 is provided for raising and lowering the base side of the fork 5 and the lifting wheel 4 in series, and a steering handle 9 is provided in relation to the longitudinal axis 2.

The conventional configuration is an existing hand lifter which is pushed and pulled by human power. In the present invention, an auxiliary drive unit device is provided in the hand lifter having such a configuration.

That is, as shown in FIGS. 2 to 6, left and right rear wheels 1 a and 1 b are supported on an axle 11 via bearings 10 and 10, and the axle 11 is A state in which the base 13 is fixed to the longitudinal axis 2 and the final output shaft 14 is directed to the left and right on the base portion behind the rear wheel of the base 13. Thus, for example, a drive rotating means 15 including a motor M and a speed reducer G is provided, and a chain-type transmission means 16 is provided across the output shaft 14 of the drive rotating means 15 and one of the left and right rear wheels 1a. A battery B for driving the motor and a unit U for controlling the motor are mounted on the bracket 7, and a button box 49 for switching between forward and reverse rotation of the motor M is provided on the handle 9. The push-button operation of the forward / backward / drive stop provided assists the forward / backward driving force on one of the left and right rear wheels 1a, so that even a pallet loaded with a heavy object can be easily transported. It was.

Specifically, as shown in FIG. 1, in a state where the steering wheel 9 is in a straight running posture, as shown in FIGS. 4 and 5, a hole for axle insertion is provided below the longitudinal axis 2. 17 is formed in the left and right direction, and further, a pin insertion hole 18 is formed in the lower part of the vertical axis 2 in the front and rear direction, and the vertical axis 2, the axle insertion hole 17 and the pin insertion hole are formed. While the respective axes of the shafts 18 are orthogonal to each other, a pin insertion hole 19 having substantially the same diameter as that of the pin insertion hole 18 is also provided at the center of the axle 11 in the longitudinal direction. It is formed perpendicular to the core.

Then, the axle 11 is inserted into the axle insertion hole 17 of the longitudinal axis 2, and a bolt is used as the axle connecting pin 12, and the bolt 12 is inserted into the pin insertion hole 18 of the axle 11, respectively. The axle 11 and thus the left and right rear wheels 1a and 1b can be tilted so as to follow the unevenness of the ground by inserting the nut 19 into the bolt 19 and screwing the retaining nut 20 to the bolt 12.

A reduced diameter portion a is formed on the axle 11 at a position corresponding to both ends of the pin insertion hole 18 of the longitudinal axis 2 so that the axle 11 can be tilted. The axle 11 may be tilted without forming the portion a, that is, the axle 11 may be straight, and the pin insertion hole 18 may be formed as an elongated hole in the vertical direction.

On the other hand, as a base 13 provided with the drive rotating means 15, the base 13 is attached to an axle connecting pin (in this embodiment, a bolt as described above) 12 and the axle connecting pin 12. A fixed base 23 provided with a vertical axis holding means 22 for holding the vertical axis portion above the fixed base 23, and is pivotally attached to the rear side of the fixed base 23 so as to be swingable about a horizontal axis 24 in the left-right direction. The drive rotation means 15 is mounted on the movable base 25, and the chain tension means 26 is provided over both bases 23, 25.

As shown in FIGS. 2, 3 and 6, the fixed base 23 extends over two vertical plate portions 27 in the left-right direction, and has a vertical plate portion 28 at the rear end thereof and an upper portion. A horizontal plate portion 29 is provided at the bottom of the horizontal plate portion 29, and a plate portion 21 mounted on the axle connecting pin 12 is continuously provided from the lower surface of the horizontal plate portion 29 toward the front and downward, that is, the pin 12 is inserted through the plate portion 21. A hole (see FIG. 4) 30 is formed so that the lower side of the fixed base 23 is fixed to the lower side of the axle 11 by the axle connecting pin 12 using bolts, and the front ends of the two vertical plate portions 27 are formed. A plate-like member 31 having a semicircular recess b for axle engagement is provided at the portion.

A plate-like member 32 having a semicircular recess c for engaging with an axle is prepared in the same manner as the above-mentioned plate-like member 31, and bolt insertion holes d are formed on both left and right sides of the plate-like member 32. A bolt screw hole e is formed concentrically with the bolt insertion hole d on each of the left and right sides of the plate member 31, and the bolt 33 inserted through the hole d of the plate member 32 is By screwing into the bolt screw hole e of the shaped member 31, means for clamping the upper part of the vertical axis 2, that is, the vertical axis clamping means 22 is formed.

The movable base 25 is connected to a rear end portion of the horizontal plate portion 29 by a hinge 34 having a horizontal axis 24, and a driving rotation means is attached to a base portion behind the rear wheel of the movable base 25. 15 and sprockets 36 and 37 are fixed to the output shaft 14 of the drive rotating means 15 and bosses (other members, such as disks, which are supported by the bearing 10) 35 of the left and right rear wheels 1a, respectively. An endless chain 38 is wound around the two sprockets 36 and 37 to constitute a chain type transmission means 16 in which a motor M is controlled by a hand lever R.

On the other hand, the chain tensioning means 26 is connected to a base portion below the horizontal axis 24 of the hinge 34, specifically, as shown in FIG. For example, concentric bolt insertion holes 39 and 40 are formed in the moving base 25, and a pin insertion hole f is formed in the flattened portion at the end of the bolt insertion hole 40 on the movable base 25 side. Nuts 42 and 43 are screwed onto the bolt 41 so that the headless bolt 41 is inserted and the movable base 25 is sandwiched therebetween.

Then, the pipe 41 is concentric with the pin insertion hole f of the bolt 41 inserted into the bolt insertion hole 39, and the pipe axis is substantially parallel to the axis of the horizontal axis 24. Pipes 44, 44 are provided on the front surface of the vertical plate portion 28, and a shaft 45 is inserted between the pipes 44, 44 and the pin insertion hole f, and the shaft 45 and the pipes 44, 44 are separated by, for example, a cotter pin. By integrally moving the movable base 25 in the chain tension direction by adjusting the positions of the nuts 42 and 43, the chain 38 of the chain type transmission means 16 is tensioned.

Although not shown, the output shaft 14 is positioned below the horizontal axis 24, the drive rotation means 15 is mounted on the movable base 25, and the output shaft 14 is mounted on the movable base portion below the horizontal axis 24. , A bolt is pivotally connected via a shaft substantially parallel to the horizontal shaft 24, and the bolt is provided with a nut for pressing a fixed base portion below the horizontal shaft 24 to constitute a chain tensioning means 26. You may.

Further, the output shaft 14 is positioned below the horizontal axis 24, and the drive rotation means 15 is mounted on a movable base 25, and the output rotation means 15 is mounted on a fixed base portion or a movable base portion above the horizontal axis 24. , A bolt is pivotally mounted via an axis substantially parallel to the horizontal axis 24, and the bolt is provided with a nut for drawing a movable base portion or a fixed base portion above the horizontal axis 24, and the chain tensioning means 26 is provided. It may be configured.

Alternatively, the output shaft 14 is positioned above the horizontal axis 24, and the drive rotation means 15 is mounted on the movable base 25, and then the drive rotation means 15 is mounted on the fixed base portion or the movable base portion above the horizontal axis 24. , A bolt which is pivotally mounted via an axis substantially parallel to the horizontal axis 24, and which is provided with a nut which presses a movable base portion or a fixed base portion above the horizontal axis 24, and comprising a chain tensioning means 26. May be configured.

In the same manner as described above, the output shaft 14 is positioned above the horizontal axis 24, the drive rotation means 15 is mounted on the movable base 25, and the fixed base portion below the horizontal axis 24 is provided. Alternatively, a bolt is pivotally attached to the movable base portion via an axis substantially parallel to the horizontal axis 24, and the bolt is provided with a nut for drawing a movable base portion or a fixed base portion below the horizontal axis 24, and a chain is provided. The tensioning means 26 may be configured.

In the drawing, reference numeral 46 denotes a chain cover, which is screwed to a member 47 connected to the fixed base 23. Reference numeral 48 denotes a cover surrounding the drive rotation unit 15.

[0031]

[Effect of the invention]

 As described above, according to the present invention, the left and right rear wheels are connected to the ground while taking the form of an inexpensive one-side drive for driving one of the left and right rear wheels as an auxiliary drive unit device for the hand lifter. The structure was designed to always contact the ground following the unevenness of the ground, so that the hand lifter could be driven and driven reliably regardless of the unevenness of the ground.For example, a pallet loaded with heavy objects However, they can now be transported easily.

[Brief description of the drawings]

FIG. 1 is a perspective view of a hand lifter provided with an auxiliary drive unit device.

FIG. 2 is a perspective view showing a base and a main part of a chain type transmission means.

FIG. 3 is a side view showing a base and a chain type transmission means.

FIG. 4 is a cross-sectional plan view of the chain type transmission means with respect to the rear wheel.

FIG. 5 is an explanatory diagram showing a tilting state of left and right rear wheels.

FIG. 6 is a plan view of a base.

FIG. 7 is a cross-sectional plan view showing the chain tensioning means.

FIG. 8 is a rear view of a hand lifter having an auxiliary drive unit device for comparing the present invention.

[Explanation of symbols]

1a, 1b: rear wheels, 2: vertical axis, 3: mount, 4: lifting wheels, 5: fork, 7: bracket, 8: drive means,
9 ... steering wheel, 10 ... bearing, 11 ... axle, 12 ...
Axle connecting pin, 14 ... output shaft, 15 ... drive rotating means, 1
6 ... transmission means, 21 ... plate part, 22 ... longitudinal axis clamping means, 23
... fixed base, 24 ... horizontal axis, 25 ... movable base, 26 ...
Chain tension means, 41 ... bolt, 42 ... nut.

Claims (4)

[Utility model registration claims] 1. A base having left and right rear wheels rotatable about a vertical axis, and a base side of a fork provided with a lifting wheel at a tip thereof is connected to the base so as to be able to move up and down, and is erected on the base side of the fork. A drive means for raising and lowering the base side of the fork and the elevating wheel in series is provided over the upper side of the bracket and the gantry, and an auxiliary drive unit device of a hand lifter provided with a steering handle associated with the vertical axis. The left and right rear wheels are supported on the axle via bearings, and the axle is pivotally attached to the longitudinal axis so as to be tiltable around a pin in the front-rear direction, while the base is fixed to the longitudinal axis. In the base portion behind the rear wheel of the base, a drive rotating means is provided with the output shaft oriented in the left-right direction, and a chain type is provided across the output shaft of the drive rotating means and one of the left and right rear wheels. An auxiliary drive unit device for a hand lifter, comprising a transmission means. 2. The hand according to claim 1, wherein the base includes a plate portion mounted on the axle connection pin and a vertical axis holding means for holding a vertical axis portion above the axle connection pin. Lifter auxiliary drive unit device. 3. A fixed base having a base mounted on an axle connecting pin and a vertical holding means for holding a vertical portion above the axle connecting pin, and a rear portion of the fixed base. 2. A movable base, which is pivotally mounted on a side thereof so as to be swingable about a horizontal axis in the left-right direction, and wherein a drive rotating means is provided on the movable base, and a chain tensioning means is provided over both bases. Auxiliary drive unit device for the described hand lifter. 4. The chain tensioning means according to claim 3, wherein the chain tensioning means comprises a bolt provided on one of the fixed base and the movable base, and a nut screwed to the bolt to swing the movable base in the chain tensioning direction. Auxiliary drive unit for hand lifter.