JPS6325262Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lock brake effective sensor switch cover.

As a lock brake operation confirmation device that detects the hand brake operating load with a switch device installed in the hand brake control system and maintains the wheel cylinders installed on each wheel in a locked state to prevent the vehicle from moving unexpectedly. What is shown in Figures 1 and 2 has been proposed, and to explain this,
1 is a base plate fixed to the vehicle body frame side, 2 is a first wire connected to a handbrake lever (not shown), 3 is a second wire connected to a locking mechanism on the wheel side, and 4 is a first wire connected via a pin 5. A first link coupled to wire 2, 6 is a second wire 3
7 is a third link coupled to the second link 6 via a pin 8; 9 is a sensor plate provided on the bolt portion 10 of the first link 4; 11 is a third link 7; A switch bar 13 is provided inside a switch cover 12 made of stretchable rubber or synthetic resin,
Its right end portion 13' is made to protrude outside the cover 12 and is opposed to the sensor plate 9 with a slight gap H therebetween. 14 is a switch main body of the sensor switch 11, and 15 is a spring compressed between the third link 7 and the sensor plate 9.

In the above configuration, when the first wire 2 is pulled to the left against the spring force of the spring 15 and the switch bar 13 is displaced to the left by the sensor plate 9, the electric circuit in the switch body 14 is closed. Thus, the driver can be informed that the handbrake is being operated reliably by lighting the indicator lamp in the driver's cab. However, in the above case, since the right end portion 13' of the switch bar 13 is exposed to the outside, dust or swamp may adhere to the right end portion 13' or the left side wall of the sensor plate 9, or rust may occur, causing the gap H to change small. There is a possibility that a problem may occur in which the indicator lamp is turned on when the handbrake is not fully activated.

This invention was devised in view of the above,
To explain based on the embodiment shown in FIG. 4, a protective cover part 14 is integrated with the switch cover 12 in order to shield the right end part 13' of the switch bar 13 from the outside.
The cover part 14 is provided with an air escape hole 15 so that the sensor plate 9 can be connected to and disconnected from the switch bar 13, and a recess 14' is formed in the right end of the protective cover part 14. A convex portion 9' is formed to engage the concave portion 14' and the convex portion 9' with each other.

Since the above-mentioned embodiment has the above-mentioned configuration, dust and mud do not adhere to the right end portion 13' of the switch bar 13, and rust does not occur on the right end portion 13' or the sensor plate 9, so that the gap H can be kept constant. It has the effect of improving the reliability of handbrake operation when the handbrake is activated.

Furthermore, since the recess 14' of the protective cover 14 and the protrusion 9' of the sensor plate 9 are engaged with each other, the protective cover 14 and the sensor plate 9 are difficult to separate, making the protective cover 14 dustproof and dustproof. This has the effect of improving the mud and rust prevention effect and further increasing the reliability of the sensor switch 11.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the already proposed device, Fig. 2 is a side view thereof, Fig. 3 is an enlarged sectional view of the main part at the arrow part in Fig. 2, and Fig. 4 is similar to Fig. 3 in the embodiment of the present invention. FIG. 9...Sensor plate, 11...Sensor switch, 13...Switch bar.

Claims (1)

[Scope of utility model registration request] a first wire having one end coupled to the handbrake lever and the other end coupled to one end of the first link; a sensor plate attached to the other end of the first link;
One end is connected to the locking mechanism on the wheel side and the other end is connected to the locking mechanism on the wheel side.
a second wire coupled to the link; a third link having one end coupled to the second link and the other end supported by one end of the first link; and a third link compressed between the third link and the sensor plate. a sensor switch having a sensor switch bar attached to the third link and opposing the sensor plate with a gap therebetween; one end attached to the sensor switch and the other end on the sensor plate side of the sensor switch bar; In a lock brake device formed of a bellows-shaped switch cover attached to an end, a protective cover is provided integrally extending from the switch cover so as to surround the other end of the sensor switch bar. The extending end of the protective cover portion is attached to the sensor plate, and when the handbrake lever is operated, the sensor plate elastically deforms the protective cover portion and comes into contact with the sensor switch bar. Lock brake force auto sensor switch cover.