JP3058555U - Hand truck with table lift - Google Patents

Abstract

(57) [Summary] [Problem] Accurate table operation without using a hydraulic mechanism,
A handle truck with a table lift capable of holding a predetermined height is provided. A lower end of each of an outer and inner caesar is rotatably supported on a lower frame, and an upper end of each of the outer and inner caesars is rotatably attached to a table. A lower end of the outer caesar 14 and an upper end of the inner caesar 15 are respectively movable in the front-rear direction along the table 16 and the lower frame, and a linear actuator 13 is mounted as a drive mechanism for moving the table 16 up and down. The linear actuator 13 includes a drive unit driven by a motor, and a main shaft that expands and contracts by rotation of a screw. The tip of the main shaft is rotatably fixed to the outer scissor 14 or the inner scissor. The power supply battery 18 is a small sealed battery that is detachably suspended from the handle 17.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a hand truck with a table for manually transporting a heavy object and moving the heavy object up and down by raising and lowering the table.

[0002]

[Prior art]

 Conventional hand trucks with table lifts use devices that are operated by hydraulic pressure. That is, in a hand truck having fixed wheels in front of the vehicle body and turning wheels in the rear of the vehicle body and a table which is raised and lowered by a table scissor, a hydraulic cylinder, a hydraulic jack, or the like is used as an operating mechanism of the scissor. In such a hydraulic device, packing or the like is used as a sealing material for preventing leakage of oil filled in the cylinder.

[0003]

[Problems to be solved by the invention]

 However, in a conventional hand truck, oil leakage often occurs due to the deterioration of the packing, the damage of the cylinder, or the entry of foreign matter into oil. As a result, the table may naturally drop from a predetermined height, or the table may not rise to a predetermined position due to insufficient predetermined pressure.

[0004] In the operation by hydraulic pressure, the oil expands and contracts due to a temperature change, so that the table surface cannot be held at a fixed position in some cases. For this reason, when a heavy object placed on the table is moved horizontally to another surface, an unexpected step is generated between the surface and the other surface, and fine adjustment of the table height is required.

[0005] Furthermore, there has been a problem that the surroundings are soiled by oil drops falling on the floor surface. On the other hand, when a hydraulic jack is used as a drive source for a scissor of a hand truck, it is necessary to modify the ram, valve seat, piston, etc. in order to obtain performance that meets the purpose, but the processing accuracy varies. If this occurs, the amount of drop of the table will not be constant.

[0006] Further, the timing of descent of the hydraulic jack during operation is easily influenced by the use conditions. The present invention has been made in view of such circumstances, and an object of the invention is to provide a handle truck with a table lift capable of accurately operating a table and maintaining a predetermined height without using a hydraulic mechanism.

[0007]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention has the following configuration. That is, in a hand truck provided with a lower frame having fixed wheels and turning wheels behind the vehicle body and a table which is raised and lowered by a table scissor, the lower ends of the outer and inner caesars 14 and 15 are respectively connected to the lower part. The upper end of each of the outer and inner caesars 14 and 15 is rotatably mounted on the table 16 and is rotatably mounted on the table 16. A linear actuator 13 is mounted as a drive mechanism for moving the table 16 up and down along the table 16 and the lower frame in the front-rear direction. The linear actuator 13 is driven by a motor and a screw. It has a main shaft that expands and contracts, and the tip of this main shaft is attached to the outer scissor 14 or the inner scissor. It was rotatably fixed, and a handle 17 was provided at the rear of the lower frame 10 and a battery 18 for power supply was mounted.

With this configuration, when the crossed outer and inner scissors 14 and 15 rise, the table 16 rotatably supported with respect to them rises. When the linear actuator 13 is shortened, the table 16 is lowered.

As the linear actuator 13, an actuator using a DC motor driven by a current from a power supply battery can be employed. As the battery, for example, a small sealed lead-acid battery can be used, and this is suspended from a handle 17. It can be. In this way, the battery can be easily replaced, and the structure can be simplified by integrating the operation panel into the battery. Therefore, a lighter and smaller hand truck as a whole can be provided as compared with the case where a conventional hydraulic mechanism is used.

[0010]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a hand truck provided with the linear actuator of the present invention, and FIG. 2 is a plan view thereof. This comprises a lower frame 10 having running wheels 11 and 12, an outer caesar 14 and an inner caesar 15 which are attached to and rotate and intersect with each other, and an upper end of the outer caesar 14 and the inner caesar 15. A fixed table 16 is provided. The table size is, for example, 500 × 800 mm.

In FIG. 1, a front running wheel 11 and a rear running wheel 12 are rotatably supported at a front portion and a rear portion, respectively, of a bottom surface of a lower frame 10 constituting a chassis frame. It is held horizontally at a predetermined interval (here, about 30 mm). An L-shaped lower fixing tool 20 is provided at the front center of the lower frame 10 on the running surface side, and inclined supports 25, 25 are joined to the left and right sides of the bottom thereof. , 25 are fixed to the bottom of the lower frame 10. In this way, the lower fixture 20 forms a space in which the linear actuator 13 can be stored in an inclined state.

On the other hand, the lower ends of the outer and inner caesars 14 and 15 are inserted into grooves formed in the lower frame 10 and pivotally supported. The upper ends of the outer and inner caesars 14 and 15 are rotatably attached to the table 16.

In addition, resin rollers 23 and 24 are provided at the lower end of the outer caesar 14 and the upper end of the inner caesar 15 located on the front side of the hand truck, respectively. The resin roller 24 is fitted into a groove formed inside the side portion of the lower frame 10, and the lower end of the outer Caesar 14 and the upper end of the inner Caesar 15 located on the front side move forward and backward along the table 16 and the lower frame. It is supposed to. The outer caesar 14 and the inner caesar 15 are assembled in advance to form an assembly.

The linear actuator 13 that moves the table 16 up and down is provided with a drive unit with a built-in DC motor and a main shaft 27 that expands and contracts by rotation of a screw. A protruding piece 29 provided at the rear end of the drive unit 28 is inserted between and supported by the mounting plates 26, 26 arranged at the bottom of the lower fixture 20. On the other hand, the tip of the main shaft 27 is rotatably fixed to a fixing member 21 provided on the lower end side of the outer scissor 14.

A fixing bracket 22 protrudes from the rear end of the lower frame 10, and an upright gate-shaped handle 17 is inserted into the fixing bracket 22 and fastened and fixed with a nut. Above the handle 17, a box-shaped operation panel-integrated battery 18 is housed in a box, fitted into a mounting plate of the handle 17, hung, and fixed in a state protruding rearward. A power switch 19 is provided on the upper surface of the operation panel integrated battery 18.

The wiring from the drive section of the linear actuator 13 is connected to the connection section at the bottom of the battery 18 integrated with the operation panel. This connection is detachable, and the box is detached from the handle 17 to facilitate battery replacement.

Since the hand truck has the above-described configuration, when the power switch 19 is turned on and a predetermined operation is performed, the linear actuator 13 is driven, and the main shaft expands and contracts. When the main shaft is extended, the inner scissor 15 rises while its tip moves in parallel with the table 16, and the outer scissor 14 linked thereto rises in conjunction with the movement of the inner scissor 15, so the table 16 rises. I do.

When the main shaft of the linear actuator 13 is shortened, the operation reverses to the above, and the table 16 is lowered. Here, it is assumed that the table height moves up and down in the range of 340 to 810 mm, the maximum loading load is 250 kg, and the linear actuator employs a maximum thrust of 1000 kg and a stroke of 200 mm. If the large load capacity, table length, etc. change, select a linear actuator with appropriate performance.

[0019] The use of such a screw type linear actuator makes operation noise quiet, and since there is no oil contamination, it is an innovative hand truck with a table lift that can be used in environmentally friendly facilities such as hospitals and research laboratories. It became.

[0020]

[Effect of the invention]

 As described above, according to the present invention, there is an advantage that oil leakage is eliminated due to the elimination of a hydraulic device, maintenance work is reduced, and accurate operation is always ensured even after many years of use.

Further, by adopting the screw mechanism, the table does not drop even when the table is stopped halfway up and down.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a hand truck with a table lift of the present invention.

FIG. 2 is a plan view thereof.

FIG. 3 is a front view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Lower frame 11 Front wheel 12 Rear wheel 13 Linear actuator 14 Outer scissor 15 Inner scissor 16 Table 17 Handle 18 Operation panel integrated battery 19 Operation switch

Claims (2)

[Utility model registration claims] 1. A hand truck comprising a lower frame having fixed wheels in front of a vehicle body and turning wheels in the rear of the vehicle body, and a table which is raised and lowered by a table scissor, wherein respective lower ends of an outer caesar 14 and an inner caesar 15 are provided. Is rotatably supported on the lower frame 10, and the outer caesar 14 is
The upper ends of the inner and outer caesars 15 are rotatably attached to the table 16, and the lower end of the outer caesar 14 and the upper end of the inner caesar 15 are respectively movable in the front-rear direction along the table 16 and the lower frame. A linear actuator 13 is mounted as a drive mechanism for raising and lowering the motor. The linear actuator 13 includes a drive unit driven by a motor, and a main shaft that expands and contracts by rotation of a screw. It is movably fixed and the lower frame 1
A hand truck with a table lift, wherein a handle 17 is provided on the rear side of the vehicle 0 and a battery 18 for a power source is mounted. 2. The hand truck with a table according to claim 1, wherein the battery is a small sealed battery which is removably suspended from the handle 17.