JPS6151090B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cart (wheelbarrow) for laying paving material, and the paving material laid by the cart of the present invention is particularly suitable for use in slabs that are too heavy to be laid by hand.
and a group of paving stones placed side by side and understood as a group and laid together. These paving materials or pavement stones are preferably made of concrete and are used for paving plazas, motorways, etc.

The object of the invention is to provide a cart for laying paving material, which is simple in construction, inexpensive and particularly robust.

A cart according to the invention comprises: (a) a movable frame having front wheels, at least one rear wheel, and an actuating rod extending rearward; (b) mounted on the frame and swinging about a horizontal swing axis; (c) A beam that moves forward and holds the paving material; (d) A beam that acts between the frame and the beam and moves the beam upward when the grasper does not hold any paving material; When the grasper holds the paving material,
(e) braking means acting between said frame and said beam to selectively prevent or permit said beam to swing downwardly under progressive loading; has ;

The wheels may be mounted on the frame so that the orientation of their axes relative to the frame is constant, but alternatively they may be rotated relative to the frame about a vertical axis, for example on a service wagon. Alternatively, it can be attached to the frame, like caster wheels on a push chair, and this attachment method is particularly applicable to the rear wheels, which improves the cart's maneuverability.
is facilitated. The front and rear wheels may be of different dimensions, in particular the rear wheel may be small. The above spring means is
The beam is designed in such a way that it can be loaded even by a paving material or a group of paving materials having a predetermined minimum weight when performing a downward swing.

As the spring means, any kind of spring,
For example, torsion springs, helical springs wound on top of each other, coil springs, rubber springs may also be used, but preferably a coil spring under tension is used, one end of which is attached to the frame. is,
The other end springs the beam in an upward swinging direction. A particularly desirable assembly condition is obtained when a curved guide means is provided as a holder for each tension spring, said guide means having the shape of an arc and located coaxially with the pivot axis of said beam. It will be destroyed.

Due to the relationship between the dimensions of the swinging area of the beam and the dimensions of the paving material grasper, it is advantageous to give the beam a bent shape, so that the beam does not impinge on the grasper in the upward swinging position. It can be avoided.

Furthermore, in the present invention, the swing axis of the beam is placed at a position behind the front wheel axis and in front of the rear wheel axis, so that the weight of the paving material gripped by the gripper is may be caused to pass through the beam and over a relatively rear portion of the frame, thereby
A compact and load-friendly structure is obtained. It is particularly advantageous to design the beam in such a way that it can be swung upwards, at least to the extent that the grasper is in the area vertically above the front wheel, so that when moving the cart the grasped load is The wheel is not in front of the front wheels, thus eliminating the need to balance the cart by applying force on the actuating rod.

Preferably, the braking means has a brake spring to keep the means in a braking state at all times, thereby eliminating the need for the operator to keep the braking means in a braking state when moving the cart. An actuating body for releasing the brake condition is provided, which actuating body can be actuated by the operator's hand or foot and is located where the operator normally stands, i.e. where it can be reached from the end of the actuating rod. It is desirable to be placed.

The braking means preferably has a first brake body that rotates coaxially with the beater and a second brake body attached to the frame, and a braking state is established by frictional engagement between these two brake bodies. .

By providing the first brake body coaxially with the swing axis of the beam, the cart can be made more compact.

A particularly suitable structure for the braking means is a band brake, which has a braking wheel non-rotatably attached to the beam coaxially with the swing axis of the beam. A brake band is placed around the brake wheel, with one end of the band attached to the frame and the other end attached to an actuating body, the position of which determines the degree to which the brake band is pressed against the brake wheel.
Compared to the forces required to establish the braking condition, this band brake can provide a particularly high braking effect and is also particularly advantageous in holding.

As will become clear from the description below, in the operation of the cart of the present invention, the entire frame is often swung around a horizontal axis defined by the contact line between the front or rear wheels and the ground. However, in order to facilitate the rocking of this frame,
The frame is provided with an extension extending rearwardly and having a pedal, on which the operator can apply force with his foot.

The present invention will be explained below with reference to embodiments shown in the drawings.

The illustrated cart 2 has a frame 4 consisting of essentially four holders, the first holder 6 extending diagonally upward from the lower front end of the frame 4 toward the upper rear, and the second holder 8 Slightly upward from the upper end of the first holding body 6,
The third holding body 12 comes out rearward and meets the actuating rod 10, and the third holding body 12 comes out obliquely upward and rearward from the front lower end of the first holding body 6, but has a smaller slope than the first holding body 6. Get out. The rear end of the third holder 12 is connected to the second holder 8 via a fourth holder 14 that forms a steep slope and projects upward. The rear end of the actuating rod 10 is divided into two parts, and two handles 16 are attached thereto. An additional holder 18 projects diagonally rearward and downward from a point substantially close to the point where the first holder 6 is connected to the second holder 8, and this holder 18 connects the third holder 18 and the fourth holder 14. connected to these holders at the point of connection with and extending rearwardly beyond said point of connection;
It has a pedal 20 at its end.

A horizontal front wheel shaft 22 is provided at the connection point between the first holding body 6 and the third holding body 12, and on this shaft 22,
One front wheel 24 with pneumatic tires is rotatably attached to each of the left and right sides of the frame 4. Third holding body 12
A bracket 26 protrudes downward from the middle part of the frame 4, and the bracket 26 holds a horizontal rear wheel shaft 28. On the rear wheel shaft 28, rear wheels 30 with pneumatic tires, one on each side of the left and right sides of the frame 4, are rotatable. mounted on. The front wheels 24 and the rear wheels 30 touch the ground 3 at the contact line 32.
4, the cart 2 can be moved on this ground by rolling wheels 24 and 30.

A beam 36 is attached to the first holder 6 approximately at the center of its length, and the beam 36 can pivot about a horizontal pivot axis 36 . The beam 36 has a generally inverted L-shaped configuration and has a first leg 40
takes the same direction as the first holder 6 when the beam 36 is completely swung upward, that is, extends diagonally backward and upward, and the second leg 42 extends in a direction relative to the lower leg (first leg) 40. At the swing position of the beam 36, the beam 36 comes out diagonally upward and forward. The second leg 42 has a downwardly curved portion at the front thereof.
In the position where the beam 36 is completely swung downward (the position shown by the broken line in the figure), the first leg 40 is directed diagonally forward and upward, and the second leg 42 is directed diagonally forward and downward. The swing shaft 38 is connected to the wheels 24 and 30.
Looking upwards and in the longitudinal direction of cart 2,
It is placed behind the front wheel axle 22 and in front of the rear wheel axle 28.

A clamp grasper 4 is attached to the front free end of the beam 36.
2 is suspended by a vertical rod 40, the upper end of which is hinged to beam 36, and the lower end of vertical rod 40 to a grasper 42. The grasper 42 has two grasping jaws 44 and 46.
The grasping jaws 44, 46 are movable relative to each other and can close automatically when the grasper 42 is lifted.

Coaxially with the swing axis 38, two arc-shaped guide means 48 are non-rotatably connected to the beam 36, one of the arc-shaped guide means 48 is placed on the left side of the beam 36, and the other one is placed on the left side of the beam 36. is placed on the right side. Attached to each one of the two guide means 48 is the upper end of each one of the tension springs 50 in the form of a helical spring, the lower end of which is attached to the frame 4 in the area of the front wheel axle 22 . When the beam 36 swings downward, each of the two springs 50 is stretched, and its rear upper part is gradually held in an arc on each guide means 48. In this way, it is possible to use tension springs 50 with long strokes in a space-saving manner.

A brake wheel 52 is mounted on one side of the beam 36, and a brake wheel 52 is mounted on one side of the beam 36.
8 and near the guide means 48 (in the axial direction), the outer periphery of the brake wheel 52 is circular, and the brake band 54 is attached around the ring 52 over an area of about 270°. The brake band 54 has a brake lining 56. A foot lever 5 is located approximately in the middle of the additional holding body 18.
The actuating body in the form of 8 is hinged so that the lever 58 can be swung about an articulation point 60. One end of the brake band 54 is fixed to the frame 4 near a connection point 60. The brake band 54 emerges from the connection point 60 approximately in the direction of the additional holding body 18, then around the outer circumference of the brake wheel 52 by approximately 270°, and then,
A tension bolt 62 is provided diagonally rearward and upward toward a connecting point 64 of the foot lever 58, and is attached between the connecting point 64 and the end of the band 54. The connection point 64 is located a few centimeters from the connection point 60 by the foot lever 5.
It is pointed towards the lower end of 8. Foot lever 58
A coil spring 66 is placed under tension between the second holding body 8 and the coil spring 66 which normally pulls the foot lever 58 upwards, thereby causing the grasper 42 to
The brake band 54 is strong enough to prevent the beam 36 from swinging downward even when a load is applied to the brake band 54.
A force is applied to band 54 such that it tightens against brake wheel 52. The operator presses the lever 58 with his foot.
When the brake band 54 is stepped down against the force of the spring 66, the brake band 54 is loosened and the beam 36 can swing.

In the structure shown, the beam 36 consists of two parallel steel members, which are placed on the right and left sides of the first holder 6 (front and rear in the drawing). They are interconnected by transverse connections (not shown), so that the frame 4 is placed between the two members of the beam. Alternatively, each of the holders 6, 8, 12, 14 of the frame 4 consists of two steel members placed parallel to each other on the right and left sides (at the front and rear of the drawing), 36 can also be placed between the two members of the first holder 6, in which case:
Beam 36 may be constructed from a single piece.

In order to be able to respond to changes in the dimensions or weight of the paving material or group of paving materials to be laid, the actuating rod 1
0 and/or the length of the first leg 40 of the beam 36 and/or the second leg 42 of the beam 36 and/or the holder 18 and/or the foot lever 58 leading to the pedal. It can be made adjustable by being telescoping.

The cart of the present invention may be operated as follows.

Paving materials, for example groups of concrete paving stones to be assembled, are supplied in a stacked manner in the form of supply stacks placed on the ground 34. The operator moves the cart 2 to the stack, with the grasper 42 being raised to the required height. The cart 2 as a whole is then pivoted about the ground contact line 32 to lower the grasper 42 to the top layer of the supply stack. This causes the upper point of pivot of the rod 40 to be moved forward so that the grasper 42 is in the area in front of the front wheel 24, since the rod 40 is always kept in a vertical position.

When the contact lever 68 of the grasper 42 contacts the upper surface of the uppermost paving material, the grasping jaws 44 and 46 extend transversely to the length of the cart 2 and are unlocked. Engages both sides of the paving material. Then, the operator presses pedal 2 with his/her foot.
By stepping down on 0, the cart 2 is connected to the ground wire 3.
2, the gripping device 42 is raised and the gripping jaws 44 and 46 are automatically closed, so that the paving material to be laid is lifted from the supply stack and, by the gripping action of the gripping device 42, closed automatically. They are suspended from the beam 36 while being held together. The band brake is tightened (applied) during the entire operation. By rocking the cart 2 rearward about the ground line 32, the paving material is in the area vertically above the front wheels 24, so that the cart stands balanced on itself and does not move toward the pedals 20 or the handlebars 16. There is no need to stabilize it by applying force to it. The operator then moves the cart 2 to a desired paving location in the grasped group of paving materials, and upon reaching that location, the operator releases the band brake by stepping on the brake release lever 58 with his or her foot;
The beam 36 thus swings downward until the paving material is placed over the location. This beam 36
During the downward swing of , the spring 50 is tensioned. The grasper 42 is released by lowering the paving material into contact with the ground at the paving location and (if necessary) further rocking the cart 2 slightly about the ground line 32. , is locked in the unfolded, open position, so that the grasper 42 can then move the laid pavers without having to lift them again.
It can be raised. An upward swinging of the beam 36 is then effected by the tensioned spring 50, which lifts the beam 36 and the unloaded grasper 42. In order to perform the above-mentioned rocking, the operator releases the band brake by stepping on the brake release lever 58 with his or her foot. after that,
A new paving cycle can begin.

[Brief explanation of the drawing]

The figure is a side view of a cart according to one embodiment of the invention, in which the uppermost swinging position of the beam is shown in solid lines and the lowermost swinging position is shown in dashed lines. 2... Cart, 4... Frame, 6, 8, 12, 1
4, 18...First, second, third, which constitute frame 4
Fourth and additional holding body, 16...handle, 20
...Pedal, 24,30...Front wheel and rear wheel, 3
4...ground, 36...beam, 42...grasp,
44, 46...grasping jaw, 50...tension spring, 5
4... Brake band, 58... Foot lever.

Claims (1)

[Scope of Claims] 1. A cart for laying paving material, comprising: (a) a movable frame having a front wheel, at least one rear wheel, and an actuating rod extending rearward; (b) a movable frame attached to the frame and having a front (c) A paving material grasper held by this beam; (d) A grasper operating between the frame and the beam; When the gripping device does not hold the paving material, the beam is swung upward, and when the gripping device does hold the paving material,
(e) braking means acting between said frame and said beam to selectively prevent or permit rocking of said beam; A cart with; 2 At least one tension spring is provided as the spring means, one end of the tension spring is attached to the frame, the other end springs in the direction of swinging the beam upward, and has a curved shape as a holder for the spring. 2. A cart according to claim 1, wherein a shaped guiding means is provided. 3. The cart according to claim 2, wherein the guide means has an arc shape and is placed coaxially with the swing axis of the beam. 4. The cart of claim 1, wherein the beam has a bent shape. 5. The cart according to claim 1, wherein the swing axis of the beam is located behind the front wheel axis and in front of the rear wheel axis. 6. A cart according to claim 1 or claim 5, wherein the beam can be swung upwards at least to the extent that the grasper is in the area vertically above the front wheel. 7. Claim 1, wherein the braking means has a brake spring for always keeping the means in a braking state, and is further provided with an actuating body for releasing the braking state against the force of the brake spring. Cart as described in section. 8 The braking means has a first brake body that rotates coaxially with the beam, and a second brake body that is attached to the frame, and a braking state is established by frictional engagement between these two brake bodies. A cart according to claim 1. 9 A band brake is provided as the braking means, and this brake has a braking wheel non-rotatably attached to the beam coaxially with the swing axis of the beam, and a brake band is attached around the braking wheel. is applied, one end of the band is attached to the frame, the other end is attached to an actuating body, and the degree to which the brake band is pressed against the brake wheel is determined depending on the position of the actuating body. Cart as described in Section 7.