JPH0338060Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Purpose of the invention) The invention is capable of setting a safe descending speed for the load without worrying about oil leakage.
This relates to a table-elevating transport vehicle whose purpose is to facilitate the replacement of casters and to facilitate handling.

(Prior Art) Conventionally, when a hydraulic jack is used diagonally in a transport vehicle with a table that moves up and down, a hydraulic hose is required between the jack body and the piston, and there is concern about oil leakage due to breakage of this hose. Furthermore, since the descending speed was uniform with respect to the loaded load, it took a long time even when the vehicle was empty. In addition, since the caster mounting portion of the frame only has mounting holes for either the free metal fitting or the fixed metal fitting, it is not possible to replace different types of casters at the front and rear.

(Structure of the invention) In view of these drawbacks, the present invention eliminates the fear of oil leakage due to damage to the hydraulic hose, allows a safe descending speed to be set for the loaded load, and facilitates caster replacement. This invention is intended to be easy to handle, and the present invention will be explained based on the drawings of the embodiments.

As shown in FIGS. 1 to 4, the table elevating transport vehicle 1 according to the present invention has fixed casters 3 installed at two locations on the front side of the frame 2 through screws 42 in mounting pitch holes 39 for fixing fittings. A free caster 4 equipped with a brake device at two places on the rear side is installed in the free fitting mounting pitch hole 38 via a screw 42, and two frame roller guides 5 are installed parallel to each other along the front and back direction on the upper surface side of the frame 2. The frame roller guide 5 is formed in a U-shape in cross section, and the openings thereof face each other. frame 2
A pair of left and right bearings 6 are fixed to the rear of the frame 2.
A handle 7 is fixed to the rear edge of the handle. table 8
The cross arm 9 for supporting the cross arm 9 is assembled into an x-shape by pivotally connecting two arm members 9a at the middle in the longitudinal direction with an arm center pin 10, and is moved to the upper and lower ends of the front of the cross arm 9. The rollers 11 are pivotally mounted, and the two sets of cross arms 9 are mounted on the frame 2 with the rollers 11 facing outward.
The movable roller 11 at the lower front end is inserted into the frame roller guide 5 and is movable only in the front-rear direction. The table 8 has a table roller guide 12 having a U-shaped cross section on the lower surface side, and a moving roller 11 at the front upper end of the cross arm 9 is inserted into the table roller guide 12. Further, a bearing 6 is fixed to the rear of the table 8, and both upper and lower rear ends of the cross arm 9 are pivotally connected to both the bearings 6 by pins 40. A trough portion 13 provided along the front-rear direction at the center of the frame 2 in the width direction
A hydraulic jack 14 is installed diagonally with its ram 15 facing rearward, and its axis is diagonally upward rearward (approximately
45°) direction with a jack receiving shaft 16, and the tip of the ram 15 is pivoted with a pin 18 to a support plate 17 on a jack arm 41 installed between the bases of left and right opposing cross arms 9. , a trough part 13 and a pin 2 at the rear end of the hydraulic jack 14.
0 and 22 are connected by inserting the pump piston 19 into the pedal receiver 21.
A pedal 23 made of a curved pipe is fixed to the pedal. Further, 24 is a return spring for the pump piston 19, and 25 is an opening/closing valve for switching to a circuit for releasing the pressure oil that presses the pump piston 19 in the hydraulic jack 14. The valve is connected to a rod 26 and is a face plate fixed to the handle 7. Lowering lever receiving plate 2 on 27
8, a lowering adjustment knob 30 having a stopper pin 29 is connected to the upper part thereof via a wave washer 31, and a ring 34 having a stopper pin 32 and a stopper adjustment screw 33 on the same plane is inserted into the upper part thereof, A valve opening/closing knob 35 is provided above, and the upper end of a rod 26 is connected to the opening/closing knob portion fixed by a nut 37 through a spring washer 36 from the lower part of the lowering lever receiving plate 28. Further, both free metal fitting mounting pitch holes 38 and fixed metal fitting mounting pitch holes 39 are bored at the mounting positions of the casters 3 and 4 on the front and rear sides of the frame 2.

(effect of invention) The working example of the present invention will be explained based on the drawings.

When raising the table 8, when the pedal 23 is stepped several times from the position shown by the solid line to the position shown by the dotted line in FIG. 1, the pump piston 19 reciprocates and presses the pump piston 19 of the hydraulic jack 14. Hydraulic pressure increases and ram 15
gradually becomes prominent. The tip of the ram 15 is attached to the jack arm 4 installed between the bases of the cross arm 9.
1, the cross arm member 9a rotates in the direction of arrow Q as the ram 15 protrudes, the cross arm 9 extends upward, and the table 8 Rise. Furthermore, when the table 8 is lowered, as shown in FIG. 3, when the valve opening/closing knob 35 is rotated in the direction of the arrow, the rod 26 is rotated in the same direction, and the opening/closing valve 25 connected to the rod 26 is rotated. rotates, the flow path in the hydraulic jack 14 is switched, the hydraulic pressure no longer acts on the ram 15, the ram 15 gradually retracts, and as a result, the cross arm member 9a moves in the direction of the arrow.
Rotating in the Q' direction, the cross arm 9 is contracted and the table 8 is lowered. At this time, as shown in FIG. 3, by rotating the valve opening/closing knob 35 in the direction of arrow R and fixing the stopper pin 32 with the stopper pin 29 between A and B, the opening/closing valve 25 communicating with the hydraulic jack 14 is opened. The table 8 is opened and lowered at a constant speed. To adjust the descending speed, A.
Due to the fixed position of the stopper pin 32 between -B,
This is done by adjusting the opening diameter of the on-off valve 25. In the case of an empty load, the table 8 may be fixed at point B, which has the fastest descending speed, and the height of the highest point of the table 8 may be fixed at point A. Also, as shown in Figure 4, frame 2
Both the free fitting mounting pitch hole 38 and the fixed fitting mounting pitch hole 39 are drilled at the mounting position of the upper casters 3 and 4, so the fixed caster 3 is installed in the front and the free caster 4 is installed in the rear. However, it is also possible to install the free caster 4 in the front and the fixed caster 3 in the rear, so the front and rear casters 3 and 4 can be replaced with each other.

(Effect of the invention) According to the table elevating transport vehicle according to the invention,
Since a hydraulic hose is not required, there is no need to worry about oil leakage, and the lowering speed can be set easily and safely with a one-touch method for the loaded load.
It is very convenient because even casters with different types of front and rear fixed and free fittings can be replaced.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway side view of a table elevating transport vehicle according to the present invention, Fig. 2 is a view taken along the - line in Fig. 1, and Fig. 3 A is a front view of the valve opening/closing knob.
FIG. 4 is a plan view of the caster mounting portion. 1... Table elevating transport vehicle, 2... Frame, 3, 4... Casters, 7... Handle, 8
... table, 9 ... cross arm, 13 ... trough section, 14 ... hydraulic jack, 15 ... ram,
17...Support plate, 19...Pump piston, 23
... Pedal, 25 ... Opening/closing valve, 26 ... Rod, 27 ... Face plate, 29, 32 ... Stopper pin, 30 ... Lowering adjustment knob, 33 ... Stopper adjustment jagged screw, 34 ... Ring, 35 ...
Valve opening/closing knob, 38, 39... Pitch hole, 41
...Jayatsuki arm.

Claims (1)

[Scope of utility model registration request] Casters 3 at the front and rear corners of the bottom of frame 2,
4 is also used in a table elevating transport vehicle with a handle 7 erected at the rear end of the frame 2.
A pair of X-shaped cross arms 9 are formed by providing a pair of frame roller guides 5 at a predetermined interval in the front-rear direction inside both sides of the frame roller guides, and pivoting two arm members 9a at their longitudinal centers. The rear lower ends of the pair of cross arms 9 are pivotally connected to the rear end portions of the frame roller guides 5, and the front lower ends are engaged with both frame roller guides 5 so as to be able to reciprocate in the front-rear direction. The rear upper end is pivotally connected to both rear sides of a table 8 placed above the frame 2, and the front upper ends of both cross arms 9 are engaged with the table 8 so as to be able to reciprocate in the front and back direction, and the lower part of the frame 2 A jack arm 4 whose lower end portion is pivotally connected to a trough portion 13 formed in the trough portion 13 and which connects the rear lower portion of both cross arms 9 to the tip portion of a ram 15 which is arranged rearward and diagonally upward.
1, and when the pump piston 19 reciprocates by operating the pedal 23 and hydraulic pressure is generated, the ram 15 is protruded and the rear arm member of each cross arm is rotated in the rising direction. 14, an opening/closing valve 25 provided on the hydraulic jack 14 to regulate the discharge amount of pressure oil that presses the pump piston 19, a valve opening/closing knob 35 attached to the handle 7 to open/close the opening/closing valve 25, and this valve opening/closing. A table-elevating transport vehicle characterized by being provided with a lowering adjustment knob 30 having a stopper pin 29 that comes into contact with a stopper pin 32 of a knob 35 to set the opening degree of an on-off valve 25.