JPS61191466A - Hand cart for stair sliding conveyance - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to devices such as handcarts used in moving furniture and other household goods of similar weight. Handcarts are particularly useful on level ground where wheeled vehicles can be easily handled, but they are always difficult to climb up and down stairs. Prior art handcarts developed specifically for staircases include three-axle handcarts and powered traction belt-driven handcarts which are well known in the industry and generally. However, powered handcarts are heavy and expensive, and often move much slower on level ground than manual handcarts. Additionally, although three-axle handcarts are superior to conventional axle-axle handcarts when climbing stairs, they still require a large amount of force to climb stairs. Additionally, a three-axle handcart can deviate from the operator when descending stairs, creating a hazard.

Ordinary handcarts, such as handcarts and trolleys, are also similar to the handcarts mentioned above, and these devices are included in the term ``handcart'' in this chapter.

That is, an object of the present invention is to provide a handcart that overcomes the drawbacks of the prior art as described above.

Thus, in short, the article of the invention comprises a longitudinally extending support frame, a handle at one longitudinal end of the frame, a wheel arrangement at the other end of the frame, and a a cargo shortcut consisting of a sliding support mounted on the frame, adapted to slide in the longitudinal direction of the frame relative to the frame, and having its tread on a plane passing through the wheel arrangement; It is a handcart for transporting long distances.

The wheel arrangement preferably consists of a pair of coaxial wheels spaced apart from each other, and the sliding support comprises a frame with two longitudinal sliding plates defining a contact surface. Preferably, each sliding plate extends from between the axle and the periphery of each wheel of the pair of wheels.

Furthermore, this sliding support slides on a bearing arrangement between the above-mentioned frame and this support, and the support is
Preferably, a biasing device, such as a spring, is provided, which is pressed against the handle side end of the handcart.

The above wheels may be of the normal three-axle type.

Further, a further pair of mutually spaced coaxial wheels are provided at the handle end of the handcart, a portion of the periphery of which wheels rests on the lower part of the ground contact surface. is preferred.

By way of example only, a preferred embodiment of the invention comprises:
The following description will be made with reference to the attached drawings, which will be described separately.

The handcart illustrated in the drawings typically has a main frame structure 10 with longitudinally extending side members and transverse members therebetween.

A sliding support 11 is slidably mounted on this frame 10, and a rotary bearing arrangement 14 is located between the two to assist in sliding. The sliding support 11 may also be in the form of two generally longitudinally extending parts 11 and a transverse member extending therebetween.

This sliding support 11 is attached to the frame 10 with some gap between it and the sliding support supports the load of the handcart or the load placed on the handcart. Sometimes this load is transferred to the frame 10 through bearings 10. When no load is applied to the sliding support 11, a sufficient gap exists between the support 10 and the bearing 14, and the support 10 is slightly separated from the bearing 14. When this occurs, the spring 18 biases the support 11 towards the handle end of the handcart.

Attached to the support 11 is a ground plane covered with leather or a similar material. This ground surface 12 is located between the axis of rotation of the rear main wheel 16 and the surrounding load area.
It lies on a plane intersecting this wheel 16.

The bearing arrangement described above must be arranged approximately evenly along each sliding support 11, so that this support can be moved in the longitudinal direction. To do this,
A conventional bearing retainer may be used or, as shown in FIG. 4, each bearing element 14 may be housed in a number of elongated chambers defined by ridges 21 on the bearing race surface. .

This handcart has an auxiliary wheel 17 at one end thereof.
A handle 13 is attached, and at the other end a main support wheel 16 is attached. This handle 13 is adapted to be rotated around a substantially longitudinal line of the handcart. Because the handle is rotated in this way, when climbing stairs, the handle is held with the handle pointing upwards, as seen in drawing 3, and when the handcart is used on level ground, in order to balance the load, If the vehicle needs to be tilted to some extent, the operator can grip the handle with the handle facing downwards, as shown in Figure 2, so that almost no load is placed on the operator. Additionally, the handle 13 is fitted with a releasable locking device, such as a spring-loaded ball and recess combination.
Unnecessary coaxiality of the handle can be prevented. Handle 1
3 and the frame 10 may be reliably connected by screw connection or the like.

A load support plate 15 is provided at the end of the handcart on the side of the main wheel 16.

The main advantage of this handcart is firstly when climbing stairs and secondly when descending stairs. Figure 3 shows the general operating procedure for climbing stairs.

First of all, as can be seen at the bottom of drawing 3, this handcart is being pulled up the next staircase 20, and the support 11 is pulled up the staircase 20.
It hits the corner line. At this time, the support 11 remains stationary relative to the stairs 20, and the handcart is moved with almost no force required, and the cargo load is supported by the bearing 14 that is in contact with the support 11. As the handcart was pulled up the stairs, the main wheels 16 touched the edge of the next step. The state at this time is shown in the upper part of FIG. Here, when the main wheel 16 passes the corner of the step 20, the end of the handcart on the main wheel side is slightly raised.

When the handcart is now pulled up, the main wheel 16 will be stable on the step 20 again, as shown in the lower part of FIG. In the above operation, when the end of the handcart on the handle side is raised a little, the support body 11 no longer contacts the step, and the spring 18 pushes back the support body 11 and pushes it against the frame 10. will be returned to its initial position. This handcart then faces the next stage 20.

In this handcart, the maximum upward angle when the operator pulls it is an angle equal to the angle of inclination of the entire stage. In contrast, for example, in a conventional three-axle handwheel, the average pulling angle is the first required pulling angle for each stage angle, and therefore the force required for this is the average This is greater than the pulling force. in this way,
In the handcart of the present invention, due to the effect of the sliding support 11, objects of the same weight can be pulled up successive stairs at all times with the minimum necessary pulling force. Furthermore, the utility of the rotating handle 13 allows the vehicle to be easily handled under various conditions.

When going down stairs, the handcart is usually moved by its main wheels 16. However, when the diameter of the main wheel 16 is smaller than the height of each stage and does not reach the horizontal surface of the next stage, the handcart is gently lowered by sliding on the flat surface 12. At this time, the support 11 hits a stop device (not shown) and no longer moves in the direction of the nozzle. Or also,
A strong spring is mounted so that it acts in the same way as spring 18, but in the opposite direction, so that when support 11 moves from its normal position towards the handle end;
This may be pushed back toward the main wheel side.

Furthermore, this handcart can be improved by installing wheel brakes. That is, it is convenient to attach one of the two brake levers of a suitable wheel brake to the handle of the handcart. To activate this, apply the brakes when descending the stairs.

That is, when this brake is applied, each time the main wheel comes to the corner of each step, the main wheel stops the handcart from moving forward. Then, when the brake is gently released, the handcart will quietly turn around the corner of the stairs.

The brake can also be used when climbing stairs, keeping the handcart in equilibrium when the main wheels are loaded and the ball bearing chassis is spring-backed.

[Brief explanation of drawings]

Figure 1 is a general plan view of the preferred embodiment described above. Drawing 2 is drawing l with one wheel removed for explanation.
FIG. 3 is a side view of the device. Figure 3 is a schematic representation of the handcart climbing a flight of stairs, and Figure 4 illustrates the bearing arrangement used in the embodiment of Figures 1 and 2. 10...Frame, 11...Sliding support, 16
...Main wheel, 13...Handle, 14...Bearing l/,,"/G,/F/G, 2 8G, 3

Claims (9)

[Claims] (1) A frame (10) extending in the vertical direction of the handcart, a handle (
13) and a wheel device (16) provided at the other end of the frame (10), the handcart for transporting cargo over short distances, the handcart being on a plane passing through the wheel device (16). The frame (12) is provided with a ground plane (12), and the frame (12) is
A transport handcart, characterized in that a sliding support (11) is attached to the frame (10), which is adapted to slide longitudinally relative to the frame (10). (2) The sliding support (11) is connected to the frame (1).
0) and the support body (11).
) characterized in that it is provided with a biasing device (18) adapted to slide on said sliding support and pushing said sliding support towards the end of said handle (13) of said handcart. Handcart for transportation according to section. (3) The transportation handcart according to item 2 above, wherein the load biasing device is a spring. (4) The ground plane (12) of the sliding support (11) is located on a plane that intersects the wheel between the wheel periphery that is farthest from the support frame (10) and the wheel rotation axis. 3. The transportation handcart according to item 3 above, characterized in that: (5) The sliding support (11) is provided with two members having a U-shaped cross-section and extending in the longitudinal direction, spaced apart from each other in the transverse direction, and in the U-shaped cross-section, The second bearing device (10) is provided with a bearing device (10) of
Handcart for transportation according to section. (6) The transport handcart according to item 5, characterized in that the bearing device contains several ball or roller bearings separated from each other by a bearing retainer. (7) said element having a U-shaped cross-section is provided with a number of chambers separated from each other in the longitudinal direction by several transverse ridges extending across the cross-section of said element; A handcart for transportation according to paragraph 5 above. (8) said handle (13) consists of two handle parts, each said handle part being provided on each side of said handcart and extending around its longitudinal axis relative to said handcart; The carrying hand according to item 1 above, characterized in that the handle portion is provided with a hand gripping portion that is rotatable and rotates in a substantially horizontal circular shape when the handle portion is rotated. car. (9) The handcart according to item 8, wherein said handle is provided with a positive fixing device for fixing said handle portions in appropriate predetermined positions.