JPH0219632Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a self-locking prevention fitting for brakes, and is provided so that the brake rod can be pushed back in conjunction with the return action of the brake lever when the brake is released. The purpose of this is to prevent the self-locking of the device.

Figures 4 and 5 are drawings showing a conventional method of connecting a brake rod and a brake lever. The brake lever 1 is rotatably provided via the brake lever 2.
While the pin 3 is horizontally suspended, a brake rod 5 protruding from an appropriate brake mechanism (not shown) is inserted through the pin 3 through the actuating plates 4, 4, and the tip of the rod 5 is inserted into the pin 3. A collar 6 is present between the pin 3 and the pin 3, and the connection is achieved by screwing double nuts 7, 7. In such a conventional connection method, when the brake pedal is depressed, the brake lever 1 is pulled in the direction of the arrow a, and the brake rod 5 is also pulled in the direction of the arrow a through the pin 3 supported on the lever 1. In this braking state, if the brake pedal is stopped, the brake lever 1 will be pulled in the opposite direction to the above due to the restoring spring of the brake pedal. While the brake rod 5 is pushed back, the brake rod 5 is pulled back by a restoring spring provided in the brake mechanism to release the braking state. The above-mentioned connection mechanism is, for example, a cam plate type disc brake, that is, a steel ball is sandwiched between a cam plate and a fixed wall, and the cam plate is rotated in the circumferential direction through the tensile force of the brake rod 5. A brake configured to push the balls from the deep part of the steel ball receiving groove of the cam plate to the shallow part, and use the resulting pressing force to press the cam plate against the rotating disk to obtain a braking action. When used in a mechanism, if the steel ball gets caught in the cam plate part or the restoring spring malfunctions, the restoring spring will not be able to pull back the brake rod 5, and as mentioned above, the brake mechanism will be damaged. Even if the pressure on the brake pedal is stopped to release the braking state, the brake lever 1 is pushed back in conjunction with the brake pedal as shown in FIG. 5, but the brake rod 5
The brake is not pulled back, and as a result, a so-called self-lock condition occurs in which the brake is not released even though the brake pedal is no longer pressed.

The present invention is an attempt to improve the conventional situation in view of the above-mentioned actual situation, and the self-locking of the brake mechanism is prevented by making the push-back operation of the brake rod be performed through the return action of the brake lever. It is characterized by the fact that it can be prevented.

That is, in the present invention, a pin is placed horizontally on a brake lever that is rotatable in the front and rear directions in conjunction with the brake pedal, and the tip of a brake rod that protrudes from the brake mechanism is inserted through the pin. At the connecting part between the brake lever and the brake rod, which is provided to connect the brake lever and the brake rod by screwing a nut onto the tip thereof, there is a pair of front and rear engaging pieces, which are formed in a U-shape. The engaging piece is provided with a metal fitting that opens the through hole of the brake rod, and in order to insert the metal fitting into the brake rod through both through holes and straddling the pin, one or both of the through holes must be opened from the brake rod. The second hole has a slightly larger diameter and is opened, and the engaging piece that opens this large diameter hole is inserted into the actuating plate side so that it can come into contact with the pin. The engaging piece is fixed to the tip of the brake rod by the nut, and the nut is configured so that the engaging piece can be held between the engaging pieces and screwed together from both sides in opposite directions. This is the gist of the matter.

Hereinafter, specific embodiments of the present invention will be described with reference to the illustrative drawings. FIG. 1 is an external perspective view of an embodiment of the present invention, FIG. 2 is a front view showing its installed state, and FIG. 3 is a sectional view taken along the line A--A in FIG. 2. In the drawing, reference numeral 8 denotes a self-locking prevention fitting according to the present invention, and the metal fitting 8 is formed by bending both ends of a single metal plate relative to each other with an appropriate interval so as to have a substantially U-shaped cross section. A pair of engaging pieces 8a, 8b are formed, and the engaging pieces 8a, 8b have through holes 9a, 9, respectively.
Make it so that b is drilled. Both through holes 9a and 9b are opened with a diameter slightly larger than the diameter of the brake rod. When the self-locking prevention metal fitting 8 formed in this way is attached to the connection part between the brake rod 5 and the brake lever 1, the same metal fitting 8 is attached to the second
As shown in the figure, the brake rod 5 is inserted through the through holes 9a and 9b in a state in which the engaging pieces 8a and 8b are respectively located on both sides of the pin 3 that is suspended horizontally on the brake lever 1.
At the same time, with the inner surface of one engaging piece 8a in contact with the outer peripheral surface of the pin 3, the other engaging piece 8b is attached to the brake rod 5 through the tightening action of the double nuts 7, 7. Make it fixed. That is, the double nuts 7, 7 are screwed together from both sides in opposite directions with the engaging piece 8b between them so as to be able to sandwich the engaging piece 8b.

Next, its effect will be explained. When the brake pedal is depressed, the brake lever 1 is pulled in the direction of arrow a as shown in FIG. 2, and the brake rod 5 is also pulled in the same direction via the pin 3, thereby bringing the brake mechanism into a braking state. However, in such a state, when the pressure on the brake pedal is stopped in order to release the braking state of the brake mechanism, the brake lever 1 is moved in the opposite direction to the above through the elastic force of the restoring spring provided on the brake pedal. At this time, the self-locking prevention fitting 8 is held in such a way that one engaging piece 8b is fixed to the brake rod 5 and the other engaging piece 8a is in contact with the outer peripheral surface of the pin 3. Due to this provision, the engaging piece 8a is pressed against the pin 3 through the return action of the brake lever 1 as described above, and the brake rod 5 is fixed to the other engaging piece 8b through the pressing force. is forcibly pushed back and the braking state of the brake mechanism is released.

The present invention has the above-mentioned configuration, and as described above, a pair of engaging pieces are provided opposite each other at both left and right ends so as to have a substantially U-shaped cross section, and each engaging piece is provided with a through hole. A self-locking prevention metal fitting with a hole is formed, and the metal fitting is inserted into the brake rod with the engaging pieces positioned on both sides of the pin horizontally suspended on the brake lever, and one engaging piece is inserted into the brake rod. The other engaging piece is fixed to the brake rod while the lever is in contact with the pin, and when the brake is released, the brake rod can be pushed back in conjunction with the return action of the brake lever. It has become possible to prevent the brake mechanism from self-locking.

Furthermore, in the present invention, when one of the engaging pieces is fixed to the tip of the brake rod with a nut, the nut is placed between the engaging pieces so that the engaging piece can be held, and the nut is inserted from both sides of the engaging piece in opposite directions. By screwing in the same direction, it has become possible to simultaneously obtain the loosening action of the nut and the fixing action of the engaging piece. That is, the brake mechanism of the present invention, which is provided so that the brake rod protruding from the actuating plate is moved horizontally forward and backward, is used in, for example, tractors that require a strong braking force. In such a brake mechanism, the tensile force applied to the brake rod is extremely large, so the nut tends to loosen, and it is essential to provide a means to prevent the nut from loosening. By screwing the nuts in opposite directions from both sides, it is possible to reliably prevent the nuts from loosening, and together with preventing self-locking, it has become possible to significantly improve safety. .

Moreover, in the present invention, by having the above-described structure, it is possible to reliably apply and release the brake of the brake mechanism in response to the pedal operation through the elastic force of the restoring spring of the brake pedal. It is possible to attach the conventional parts without any processing, and the practical effect in this respect is extremely large. Furthermore, in this type of brake mechanism, it is required that the brake rod be moved horizontally forward and backward.
In the case of the present invention, the through hole that opens on the engaging side (actuating plate side) that contacts the pin is formed with a slightly larger diameter than the brake rod, so that it does not cause any trouble to the brake rod. It was now possible to move the robot horizontally forward and backward without any trouble. That is, it has become possible to reliably return to the old position (brake release position) in conjunction with the rotational movement of the brake lever.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view of the brake self-lock prevention fitting according to the present invention, Fig. 2 is a front view showing its installed state, Fig. 3 is a sectional view taken along line A-A in Fig. 2, and Fig. 4. and FIG. 5 is a front view showing the conventional structure. 1... Brake lever, 2... Support shaft, 3... Pin, 4... Actuating plate, 5...
...Brake rod, 6...Collar, 7...Double nut, 8...Self-lock prevention fitting, 8a, 8
b...Engaging piece, 9a, 9b...Through hole.

Claims (1)

[Scope of utility model registration request] A pin is placed horizontally on the brake lever, which is rotatable in the front and rear directions in conjunction with the brake pedal, and the tip of the brake rod that protrudes from the brake mechanism is inserted through the pin. In the connection part between the brake lever and the brake rod, which is provided so that the brake lever and the brake rod are connected by screwing together a nut, there is a pair of engagement pieces in the front and back, forming a U-shape. A metal fitting is provided that opens with the through holes of the brake rod facing each other, and at least one of the through holes is inserted so that both engaging pieces of the metal fitting are inserted into the brake rod through both through holes and straddling the pin. The hole is opened with a diameter slightly larger than that of the brake rod, and one engaging piece that opens this large diameter through hole is inserted into the actuating plate side and provided so that it can come into contact with the pin. At the same time, when the other engaging piece is fixed to the tip of the brake rod by the nut, the nut is screwed in opposite directions from both sides with the engaging piece between them so as to be able to clamp the engaging piece. A self-locking prevention mechanism for brakes.