JP3034821B2 - Braking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a braking device for applying a braking force to traveling wheels of a traveling body.

[0002]

2. Description of the Related Art A conventional braking device will be described with reference to FIGS.

[0003] In the figure, 1 is fixed to the rotating shaft of the traveling wheel,
Or a rotating drum connected to the rotating shaft of the traveling wheel,
A set of semicircular brake shoes 2 is symmetrically disposed inside the rotary drum 1, and both brake shoes 2 are rotatably provided around a pin 7 at the lower end. A spring 3 for urging the two in the closing direction between the two brake shoes 2
Has been passed. A cam 4 is provided between the upper ends of the brake shoes 2, and the cam 4 is rotatable.
A braking lever 5 is mounted on a rotating shaft (not shown) of the cam 4. A wire 6 is attached to the tip of the brake lever 5, and the wire 6 is connected to a braking operation means such as a brake pedal (not shown).

FIG. 12 shows a non-braking state, in which the upper end of the brake shoe 2 comes closest to the upper side by the urging force of the spring 3, that is, the cam 4 and the brake lever 5 are upright in the figure. , Both brake shoes 2 shrink,
There is a gap between the outer surface of the brake shoe 2 and the inner surface of the rotary drum 1, and no frictional force acts. Therefore, the rotary drum 1 rotates freely.

Next, when braking, the wire 6
To rotate the brake lever 5 counterclockwise in the figure against the spring 3. The cam 4 tilts to widen the upper end of the brake shoes 2 to expand both brake shoes 2. First, the gap between the outer surface of the brake shoe 2 and the inner surface of the rotary drum 1 is eliminated (see FIG. 13), and the outer surface of the brake shoe 2 is pressed against the inner surface of the rotary drum 1 by further expanding the brake shoe 2. (See FIG. 14).

[0006] From the state in which the braking lever 5 is in the neutral state to the state in which the outer surface of the brake shoe 2 is pressed against the inner surface of the rotary drum 1 to be in the braking state, what is called brake play.

[0007]

The above-described braking device is provided on a traveling wheel, and the traveling wheel is scheduled to be provided on a traveling body. In order to operate the braking lever, the braking device is connected to the braking lever 5. The wire 6 is connected to braking operation means provided on the traveling body. For this reason, the above-mentioned conventional braking device cannot be applied to a non-rail type horizontal sliding door in which a traveling wheel is provided on a fixed object and a traveling body is supported by the traveling wheel so as to be able to travel. Also, the amount of brake play must be set appropriately, but in the conventional braking device, since the cam and the braking lever are provided integrally, the function of adjusting the brake play in the braking device itself is not provided. And must be performed on the side of the braking operation means. For this reason, when a plurality of braking devices are performed by one braking operation device, adjustment between the braking operation device and each braking device and play adjustment of the braking device alone cannot be performed, and adjustment during assembly is very troublesome. In addition, there is a problem that adjustment cannot be performed when play changes over time such as wear of the brake lining.

The present invention has been made in view of the above circumstances, and is capable of adjusting between the braking device and the braking operation means and adjusting the play of each braking device.

[0009]

SUMMARY OF THE INVENTION The present invention relates to a braking device for expanding and contracting a brake shoe inscribed in a brake drum by an expansion and contraction cam, wherein a brake lever is fixed to a cam shaft of the expansion and contraction cam, and the brake lever is attached to the brake lever. The slide levers are fixed with bolts so that they intersect, and at least one of the cam shaft insertion hole of the brake lever, the brake lever, and the bolt insertion hole of the slide lever is made into an elongated hole, and the brake is movably movable relative to the slide lever. the bar is provided, at right angles under to the relative movement direction with the braking bar has a length corresponding to at least the relative movement amount parallel to the relative movement direction
To a brake device that allows the tip of the slide lever to be able to abut on the lower side of the brake bar , displaces the brake bar downward to rotationally displace the slide lever, and further moves the slide lever. The brake lever is rotated through to rotate the expansion / contraction cam to perform a braking operation, and by adjusting the positional relationship between the cam shaft and the brake lever, and the positional relationship between the brake lever and the slide lever, the tip of the slide lever is adjusted. The position between the brake bars is adjusted.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

A roller shaft 12 is mounted on a base plate 11.
A running wheel 13 is rotatably fitted to the roller shaft 12 via a rotary bearing 14. The leading end of the running wheel 13 is hollow, and the brake drum 1
5 is formed, and the brake body 15 is
6 fits outside. The brake body 16 is fitted on the roller shaft 12, and the roller shaft 12 and the brake body 16 are fixed by a sink key 17. A donut-shaped space is formed at the base end of the brake body 16.

A pair of brake shoes 18 are provided concentrically with the brake drum 15 in a donut-shaped space inside the brake drum 15. Each of the brake shoes 18 has a semicircular arc shape, a lower end of which is pivotally supported by a pin 19, and is rotatable about the lower end. A flat expansion / contraction cam 21 is sandwiched between the upper ends of the brake shoes 18, and a spring 22 is stretched between the brake shoes 18, 18. The brake shoes 18, 18 are urged in the contracting direction by the spring 22, and the rotation of the expansion / contraction cam 21 causes the brake shoes 18 to expand and contract in the radial direction.

A cam shaft 23 extending from the expansion / contraction cam 21
The brake lever 24 is rotatably penetrated through the brake body 16, and a brake lever 24 is fixed to an outer end protruding therethrough. The brake lever 24 extends in the horizontal direction, and a slide lever 25 is fixed to one end by a bolt 26.
The slide lever 25 extends in the vertical direction, and the mounting hole 27 through which the bolt 26 is inserted is a long hole in the vertical direction, and a roller follower 2 is provided at the upper end of the slide lever 25.
8 is provided rotatably.

A stopper support fitting 29 is fitted and fixed to the tip of the roller shaft 12, and the stopper support fitting 29 is also fixed to the brake body 16. The stopper support fitting 29 has a horizontally bent shelf 29a, and a stopper bolt 31 penetrating the shelf 29a is fixed by a nut 32. The upper end of the stopper bolt 31 contacts the other end of the brake lever 24, and the other end of the brake lever 24 and the shelf 29a.
A return spring 33 spans between them.

The roller follower 28 rollably abuts a brake bar 35 of the brake control mechanism (described later), and the brake bar 35 is vertically displaced so that braking of a braking device is activated. .

The roller shaft 12 is loosely fitted to a base portion thereof,
A sprocket 34 is fixed to the base end surface of the running wheel 13, and the sprocket 34 is connected to another running wheel by a chain 59 which will be described later.

A bearing bracket 36 is fixed to the end of the roller shaft 12, and a side bracket 37 is provided so as to extend over a side surface of the bearing bracket 36 and a side end surface of the base plate 11. Is a track guide roller 38 sandwiching the running wheel 13
Are provided rotatably in pairs. Thus, the braking device is incorporated into the traveling wheel 13 and is unitized as the roller unit 39. The roller unit 39 is covered by a cover 40 fixed to the tip of the roller shaft 12.

The operation of the braking device will be described below with reference to FIGS.

By displacing the brake bar 35 downward, the slide lever 2 is moved through the roller follower 28.
5. The expansion / contraction cam 21 is rotated via the brake lever 24 to expand the brake shoes 18 and 18 to apply a frictional force to the brake drum 15 to apply a braking force to the traveling wheels 13.

In order to ensure that the braking device operates, it is necessary to adjust the gap between the brake shoe 18 and the brake drum 15, that is, adjust the position of the brake lever 24, in other words, adjust the angle. The position of the brake lever 24 is adjusted when the braking device is mounted or when the brake shoe 18 is mounted.
Is performed in order to cope with wear of the friction surface of the motor.

The angle of the brake lever 24 is adjusted by loosening the bolt 26 and turning the nut 32 to adjust the position of the tip of the stopper bolt 31. The brake lever 24 is rotated by the stopper bolt 31 so that the brake lever 24
Is changed, and the play between the expansion / contraction cam 21 and the brake shoe 18 is adjusted. With the position of the brake lever 24 determined, move the slide lever 25 up and down,
A predetermined interval is provided between the roller follower 28 and the brake bar 35. Thus, the play of the brake lever 24 and the positions of the roller follower 28 and the brake bar 35 are properly determined.

A case where the roller unit 39 is fixed to a fixed object, for example, a gate wall 41 will be described.

The roller unit 39 is attached to the gate wall 41 by the base plate 4.
2. The base plate 11 is fastened and fixed together. By forming the traveling wheels and the braking device into a unit and fixing them to the base plate 42, the position of the roller unit 39 can be adjusted with respect to the base plate 42.

A lower block 45 is fixed to the upper end of the base plate 11, and two screw holes 46 penetrating vertically are formed in the lower block 45. An upper block 47 facing the lower block 45 is fixed to the upper end of the base plate 42, and a through hole 48 is formed in the upper block 47 so as to extend in the axial center of the screw hole 46.

A mounting hole 49 for fixing the base plate 42 to the gate wall 41 is a round hole into which a mounting bolt (not shown) is loosely fitted, and an adjusting hole 5 formed in the base plate 11.
0 is a vertically long slot.

To adjust and fix the roller unit 39 to the gate wall 41, the base plate 42 and the base plate 11 are temporarily fixed by inserting bolts (not shown) into the adjustment holes 50 and the mounting holes 49. After the level adjusting screw 51 is inserted into the through hole 48, it is screwed into the screw hole 46. The weight of the roller unit 39 is supported by the upper block 47 via a level adjusting screw 51. By turning the level adjusting screw 51, the lower block 45 approaches and separates from the upper block 47, and the roller unit 39 via the base plate 11.
Changes the vertical position, and the fixing position of the roller unit 39 is adjusted.

Next, a case where the present braking device is applied to a support roller that supports a non-rail type horizontal pulling gate door so as to be able to traverse will be described with reference to FIGS.

Two sets of upper roller units 55, 55 are provided above the gate wall 41, and two sets of lower roller units 39, 57 are provided below.
The door body 58 is movably supported by 55 and the lower roller units 39 and 57. As described above, the lower roller unit 39 is provided with a braking device.
9 and the lower roller unit 57 are connected by a chain 59.

A guide rail 6 is provided on the upper end surface of the door body 58.
1, a guide rail 62 is fixed to the lower end surface, and the upper roller unit 55,
The lower roller units 39 and 57 are in rolling contact with the guide rail 62.
A door receiving pedestal 64 is fixed to the gate wall 63 facing the gate wall 41, and the front end of the door body 58 comes into contact with the door in a closed state. A stopper 65 is provided behind the gate wall 41.
The door 58 is opened by the stopper 65.
Is maintained. A brake control mechanism 66 is provided at the lower portion of the door body 58 over the entire length, and a brake operation lever 67 is provided at a required height at the front end of the door body 58. The brake operation lever 67 and the brake control mechanism 66 is connected by required connecting means as described later, and the brake control mechanism 66 releases the drive of the brake.

The brake bar 68 is arranged along the lower edge of the door body 58, and the brake bar 68 is hinged at a required interval.
The hinge 6 is rotatably fixed to the door body 58 by the
9 is provided with a torsion spring 71 for urging the brake bar 68 upward. On the upper surface of the brake bar 68, a square pipe 72 for reinforcement and deformation prevention is fixed to substantially the entire length except for both end portions of the brake bar 68, and an angle material is cut short on the lower surface on the door end side of the brake bar 68. Wire fastening member 73
A brake wire 75 is engaged with the wire engaging member 73 via a hinge joint 74. The door body 5
A pulley 76 is rotatably provided on the lower end side of the door 8 and the brake wire 75 is engaged with the braking operation lever 67 after being wound around the pulley 76. The brake bar 68, the torsion spring 71, and the square pipe 72 are covered by a cover 77.

The operation when the braking control mechanism 66 activates the braking device will be described below.

From the closed state of the door 58 shown in FIG.
Is opened, the door 58 is moved rightward in the figure. The door body 58 is supported by the upper roller unit 55, the lower roller unit 39, and the lower unit roller 57 so as to be able to travel, and is guided by the track guide roller 38 in a direction perpendicular to the traveling direction. Low resistance,
Can be opened smoothly with a small force. During the movement of the door body 58, the roller follower 28 of the brake device to move the lower side of the brake bars 68, the braking bar 68 is parallel to the lower edge of the door body 58, the roller follower 28 i.e. the slide lever 25 Does not give any vertical displacement to

When it is desired to stop the door 58 at a predetermined position, the brake operation lever 67 is rotated. The rotation of the braking operation lever 67 pulls up the brake wire 75, and rotates the wire engaging member 73 through the pulley 76 in the clockwise direction in FIG. The brake bar 68 is pulled down, the roller follower 28 is pushed down, and the slide lever 25, the brake lever 2
4. The expansion / contraction cam 21 rotates via the cam shaft 23 to expand the brake shoe 18 and brake the rotation of the traveling wheel 13.

Since the lower roller unit 39 and the lower roller unit 57 are connected by the chain 59, the braking of the lower roller unit 39 is transmitted to the lower roller unit 57 via the chain 59. .
Thus, even when the weight of the door body 58 acts only on the lower roller unit 39, or even when it acts only on the lower roller unit 57, the rotation of the braking operation lever 67 causes Since the rotation of the lower roller unit 39 and the lower roller unit 57 stops, the door body 58 stops.

Since the brake bar 68 is reinforced by the square pipe 72, the positional relationship between the brake bar 68 and the roller follower 28 does not change depending on the location of the door 58, and The braking can be reliably applied even when the vehicle is in the position.

The movement of the brake operation lever 67 is transmitted to the brake bar 68 by the brake wire 75. When an extreme bending force acts on the brake wire 75, the brake wire 75 is broken due to fatigue. Therefore, the wire engaging member 73 and the brake wire 75 are connected via the hinge joint 74, and no bending force acts on the engaging portion of the brake wire 75 by the rotation of the hinge joint 74. I have.

The roller follower 2 in the braking device
8. In order to enable the position adjustment of the brake lever 24, the stop hole on the brake lever 24 side for fixing the brake lever 24 and the cam shaft 23 may be an elongated hole in the vertical direction.

[0038]

As described above, according to the present invention, since the operation from the operating means is transmitted through the roller follower, it is necessary to mechanically connect the braking device and the operating means. The braking device can be provided on the traveling wheel provided on the fixed side, and the adjustment of the mounting position of the braking device, the play adjustment of the braking device can be easily performed, and there is a change over time due to wear of the lining, etc. However, it has excellent effects such as easy adjustment.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a front view, partially broken away, showing the embodiment of the same;

FIG. 3 is a view as viewed in the direction of arrows AA in FIG. 2;

FIG. 4 is a view taken in the direction of arrows BB in FIG. 3;

FIG. 5 is an operation explanatory view of the present embodiment.

FIG. 6 is an operation explanatory diagram of the present embodiment.

FIG. 7 is an exploded perspective view of the embodiment.

FIG. 8 is a front view of a non-rail type horizontal sliding gate according to the present invention.

FIG. 9 is a front view showing a braking control mechanism of the horizontal sliding gate.

FIG. 10 is a side view showing the relationship between the braking control mechanism of the horizontal sliding gate and the braking device according to the present invention.

FIG. 11 is an enlarged side view of a braking control mechanism of the horizontal sliding gate.

FIG. 12 is a schematic view of a conventional example.

FIG. 13 is an operation explanatory view of the conventional example.

FIG. 14 is an operation explanatory view of the conventional example.

[Description of Signs] 11 Base plate 12 Roller shaft 13 Running wheel 17 Sinking key 18 Brake shoe 21 Expansion / contraction cam 23 Cam shaft 24 Brake lever 25 Slide lever 28 Roller follower 31 Stopper bolt

Claims (1)

(57) [Claims] In a braking device for expanding and contracting a brake shoe inscribed in a brake drum by an expansion and contraction cam, a brake lever is fixed to a cam shaft of the expansion and contraction cam, and a slide lever is crossed with the brake lever by a bolt. At least one of the cam shaft insertion hole of the brake lever, the brake lever, and the bolt insertion hole of the slide lever has a long hole, and a brake bar is provided so as to be relatively movable with respect to the slide lever. Parallel to relative movement direction
And has a length corresponding to at least the relative movement amount and can be displaced downward at right angles to the relative movement direction, and the tip of the slide lever can be brought into contact with the lower side of the brake bar, and the brake bar is moved downward. Sly
The lever is displaced by rotation, and further through the slide lever
Rotate the expansion / contraction cam by rotating the brake lever
A braking device characterized in that the braking operation is performed by performing the braking operation .