JPH0443418Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention relates to a hand-push cart, especially a stair-climbing cart used for the purpose of transporting heavy objects by climbing or descending them. This relates to the structure of the frame around the grip of a hand-held cart.

(Prior Art) This type of hand-push cart is shown in FIG. 6. In the figure, a is a drive shaft for climbing and descending, and wheel holding frames b are fixed to each end of the drive shaft, and wheels c of the same diameter are arranged at equal distances and angularly equal intervals from the shaft a.
are provided on the wheel holding frame b. The drive shaft a is drivingly connected to an electric motor e, which is supplied with power from a battery d through an electric circuit, through a speed reducer f. Reference numeral g denotes a main frame which extends in a straight line, and has a grip h on its upper part that maintains the cart's posture when it climbs or descends stairs.

k is a band for fixing the heavy object W.

(Problem to be solved by the invention) As mentioned above, the main frame extends straight and straight, and has a grip at the top, which allows it to carry relatively heavy objects (50 to 60 kg). The operator must be very nervous when carrying the cart up and down the stairs, and when carrying the cart along the stairs, the operator's knees may hit the straight frame, and the operator's thighs may hit the frame. They often stand up and make walking difficult.

Moreover, since the cart easily moves up and down, the operator's hand holding the grip also moves up and down, making it difficult to maintain the cart's posture, and the operator's body is strained, causing him to bend forward, making it extremely difficult to maintain a correct posture. There are problems such as fatigue and fatigue.

The purpose of this invention is to solve the above-mentioned problems.

(Means and effects for solving the problem) This invention was made in view of the above problem, and the lower part of the L-shaped member is formed at a substantially obtuse angle when viewed from the side with respect to the frame of the main column. The handle member is connected to the upper part of the L-shaped member so as to extend at an angle slightly larger than a right angle when viewed from the side, and the grip has a shape that expands toward the operator side when viewed from the side. The L-shaped member and the handle member form a surrounding frame, and the L-shaped member and the handle member are approximately T-shaped when viewed from the front, and the handle member is approximately U-shaped and opens toward the operator when viewed from the top. It is designed to provide appropriate spacing from any side, front, or top.
It is possible to provide a clearance between the upper part and the lower part of the L-shaped member relative to the operator's knees when viewed from the side, and also provide clearance relative to the operator's thighs when viewed from the upper surface of the L-shaped member;
Furthermore, by providing an appropriate clearance from the top of the handle member to the operator's body, the operator does not have to bend forward, and the operator does not have to climb up or down the stairs to carry the cart. In some cases, it is possible to maintain the cart's posture and to smoothly move the cart as it climbs and descends, and in particular, it allows the operator to maintain the correct posture and move his/her legs smoothly from side to side.

(Example) Next, an example of this invention will be described based on the drawings.

The overall outline of the hand-held cart of this invention is explained in the first part.
Shown in the figure.

In Figure 1, 1 is a drive shaft, 2 is a wheel holding frame, 3 is a wheel, 4 is a battery, 5 is an electric motor, and 6
7 is a reduction gear, 7 is a main column, and 8 is a fork, which are the same as the conventional cart shown in FIG.

In this invention, the shape of the frame F around the grip, which is the upper part of the main support 7 shown in section P in the figure, is devised so that when the operator climbs up or down the stairs, the cart maintains its posture and moves smoothly. An important feature is that it was designed based on ergonomic analysis so that the foot can be moved from side to side.

The above points will be explained below with reference to FIGS. 2 to 5.

The main support 7 consists of a part 7a on which a heavy object is placed and a frame F around the grip that is connected to the part 7a.The shape of the frame F, as seen from the side as shown in FIGS. 2 and 5, is the same as the frame 7a. An L-shaped member 7b to which the lower portion _7b2 is connected at an approximately obtuse angle α to the L-shaped member 7b, and an angle β slightly larger than a right angle when viewed from the side with respect to the upper portion _7b1 of the L-shaped member 7b. The handle member 7c is combined,
A U-shaped member is formed with an opening that widens toward the operator when viewed from the side.

Therefore, as shown in FIG. 2, when the cart is moved up and down the stairs, the operator's knees and thighs have a clearance b and a clearance a from the lower part 7b ₂ and the upper part 7b ₁ of the L-shaped member, respectively. This prevents the operator's knees and thighs from hitting the frame, making it easier to move left and right legs.

In addition, since the position of the grip 9 provided on the handle member 7c is maintained at a substantially constant position, the push button switch 11 and brake lever for driving and controlling the cart provided near the grip can be used to prevent vertical vibrations caused by transportation of the cart. can be operated smoothly.

Further, the L-shaped member 7b is formed in a substantially T-shape as shown in FIG. 5 when viewed from the front with respect to the handle member 7c, and as shown in the cross-sectional view of FIG. and L-shaped member 7b
Since the clearances d ₁ and d ₂ from the lower portion 7b ₂ of the operator can be made considerably large, the operator's thighs will not hit the operator during transportation.

Further, the handle member 7c has an eight-shape or U-shape that opens toward the operator, as seen from the top, as shown in FIG. 5, and grips 9 are formed at each end.
As shown in Figure 3, this is a cross-sectional view seen from the top, and the clearance c from the operator's torso is increased so that the operator can maintain an upright posture without bending forward during transportation. It's summery.

As described above, the shape of the frame F is made into a U-shape that widens toward the operator side when viewed from the side, as shown in Figure 5, to increase the clearance a and the clearance b, and when viewed from the front. Clearances d ₁ and d ₂ are enlarged as a T-shape when viewed from above, and clearance c is enlarged as a U-shape that opens toward the operator when viewed from the top, so when the operator transports the cart, the frame It is possible to provide appropriate clearance from each member member that makes up F, allowing the operator to maintain the cart's posture when climbing or descending stairs, and maintain the correct posture while moving the left and right legs smoothly. Ergonomic fatigue is significantly reduced since it can be carried easily.

(Effect of the invention) This invention is constructed as detailed above, so
When an operator climbs or descends stairs using a hand-held cart, the operator's feet and knees are no longer in contact with the frame around the grip, allowing the operator to maintain correct posture while using the cart. The posture allows you to move your left and right legs smoothly.

In addition, since the position of the grip is kept almost constant, there is no problem in operating the push buttons and levers provided on the grip, and the operator can transport with peace of mind, eliminating the need for nervousness and fatigue. is significantly reduced.

As described above, according to this invention, it is possible to provide a push-type cart having an extremely excellent shape from an ergonomic point of view in order to allow the operator to move smoothly, especially moving his/her left and right legs.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a hand-push cart to which an embodiment of this invention is applied, Fig. 2 schematically shows the main parts of this invention, and Figs. A sectional view and a BB sectional view are schematically shown.
Fig. 5 shows the features of this invention in a diagram, and Fig. 6 shows a conventional device. 7...Main pillar, 7a...Frame, 7b...
...L-shaped member, 7b ₁ ... Upper part of L-shaped member,
7b ₂ ... Lower part of the L-shaped member, 7c... Handle member, 9... Grip, F... Frame.

Claims (1)

[Scope of utility model registration request] The lower portion 7b 2 of the L-shaped member 7b is connected to the frame 7a of the main support 7 at a substantially obtuse angle α when viewed from the side, and the upper portion 7b ₁ of the L-shaped member 7b is connected to the frame 7a of the main support 7 at an obtuse angle _α when viewed from the side.
The angle β is slightly larger than the right angle when viewed from the side.
The handle member 7c is coupled so as to extend to form a
The frame F around the grip is formed to have an opening shape that expands toward the operator side when viewed from the side, and the L-shaped member 7b and the handle member 7c form a substantially T-shape when viewed from the front, and the handle member 7c The stair climbing device is characterized in that the frame F has an expanded U-shape that opens toward the operator when viewed from the top, and the frame F has an appropriate distance from the operator from the side, front, and top. Structure of the frame around the grip of a push cart.