JPH0220560B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a two-post lift device, and more particularly to a two-post lift device suitable for smoothly lowering a carriage that is raised and lowered on a mast.

[Prior art]

FIG. 1 is a perspective view showing a conventional two-post lift device, and FIG. 2 is a sectional view taken along the line - in FIG.

The pillar is constructed by connecting a mast 1 having a U-shaped cross section and a mast cover 3 with their openings facing each other. On the front surface of the mast 1, claws 5 are formed to protrude at predetermined intervals in the vertical direction. Further, a substantially cylindrical carriage 7 having a U-shaped cross section is fitted to the mast 1 so as to cover the front surface of the mast 1 and to be movable in the vertical direction of the mast 1. Furthermore, the axial lower part of the carriage 7 is bulged out in the forward direction of the mast, and guide arms 11 on which a vehicle can be mounted are pivotally supported at both lower ends of the bulged part 9 so as to be rotatable in the horizontal direction. .

Furthermore, a motor switch lever 12 is provided on the mast cover 3 at a position that can be operated by an operator in an upright position.By moving and operating this motor switch lever 12 in the direction of arrow A, the carriage 7 can be raised or lowered. will be held.

A safety stopper 13 is rotatably supported on the upper part of the bulging part 9, and this safety stopper 13 is bent into an L-shape outside the carriage 7 and is connected to the arm part 1.
It is said to be 5. This safety stopper 13 is interposed with a spring 17 which locks one end to the arm portion 15 and the other end to the carriage 7, and biases the safety stopper 13 clockwise B.

Furthermore, a flat stopper claw 19 is fixed to the safety stopper 13. This stopper claw 19
As shown in FIG. 3, the carriage 7 is able to come into contact with the front surface of the mast 1 and the pawl 5 under a biased state by a spring 17, and prevents the carriage 7 from descending by engaging with the upper surface of the pawl 5.

Therefore, when the carriage 7 is raised, each time the stopper pawl 19 comes into contact with the pawl 5, the safety stopper 1
3 is rotated counterclockwise by the pawl 5, and the carriage 7 rises regardless of the contact between the pawl 5 and the stopper pawl 19.

On the other hand, when the carriage 7 is lowered, the stopper pawl 1 is in contact with the front surface of the mast 1 or the pawl 5.
9 is the stopper claw 1 as the carriage 7 is lowered.
9 and engages with the claw 5 located directly below the carriage 7.
The descent of is stopped. Therefore, in order to lower the carriage 7, the safety stopper 13 must be rotated counterclockwise to release the engagement between the pawl 5 and the stopper pawl 19.

However, in such a lowering operation, the operator must simultaneously operate both the motor switch lever 12 and the safety stopper 13 with both hands. Therefore, when the carriage 7 is lowered and the distance between the motor switch lever 12 and the safety stopper 13 becomes large, an unstable posture is forced, and the lowering operation must be interrupted and carried out intermittently. This causes problems.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a two-post lift device that is highly safe and has good workability.

[Summary of the invention]

In order to achieve the above object, the two-post lift device according to the present invention includes a mast that is provided with claws at predetermined intervals in the vertical direction, and a mast that is fitted to the mast to be movable in the vertical direction and capable of mounting a vehicle. a carriage equipped with a guide arm that covers the mast and the carriage; a stopper pawl that is pivotally supported by the carriage and can be engaged with the pawl; a safety stopper that is energized; a stopper locking device that is pivotally supported by the carriage and can freely lock and release the safety stopper; and one end of the stopper locking device that is pivotally supported at the bottom of the mast cover and the other end of the stopper locking device. means for releasing the engagement between the safety stopper and the stopper locking device, which comprises a lever stopper that comes into contact with the safety stopper, a spring that biases the lever stopper clockwise, and a pin that stops the lever stopper at a predetermined position. be.

[Embodiments of the invention]

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

FIG. 4 is a perspective view showing an embodiment of a two-post lift device according to the present invention, FIG. 5 is an enlarged perspective view of the main part of FIG. FIG. 4 is a side view of FIG. 4, and the same parts as in the conventional example are given the same reference numerals, and the explanation thereof will be omitted.

A mounting plate 31 is fixed to the lower part of the carriage 7, and a stopper locking tool 33 bent in an L-shape is attached to the mounting plate 31, and a pin 3 is attached to the bent part of the stopper locking tool 33.
4, it is rotatably supported. One tip of the stopper locking tool 33 is a hook 35, which allows the safety stopper 13 to be locked. Further, the other end of the stopper locking tool 33 has a horizontal surface 3.
7 is formed.

Further, a spring 39 is interposed between the vicinity of the horizontal surface 37 of the stopper locking tool 33 and the mounting plate 31, and a pin 41 is further implanted in the mounting plate 31. This pin 41 restrains the rotation of the stopper locking tool 33 which is biased counterclockwise by the spring 39, and when the hook 35 locks the safety stopper 13, the stopper claw 19 and the claw 5 It is provided at a position that allows the engagement to be released and held.

At the bottom of the mast cover 3 is a lever stopper 4.
3 is rotatably supported by a spring 45 in a clockwise direction. Furthermore, the clockwise rotation of the lever stopper 43 is restricted by a pin 47 fixed to the mast cover 3, and the lever stopper 43 is stopped in a substantially horizontal state. Further, the tip of the lever stopper 43 can come into contact with the horizontal surface 37 that moves as the carriage 7 moves in the vertical direction, so that when the horizontal surface 37 is lowered, the stopper locking tool 3
3 clockwise to release the lock between the hook 35 and the safety stopper 13.

Note that the lever stopper 43 is moved downward after the stopper pawl 19 passes through the pawl 5 at the lowest position.
The lever stopper 43 is set at a position where the hook 35 and the safety stopper 13 are unlocked.

Next, the action will be explained.

When raising the vehicle, move the vehicle above the guide arm 11, release the lock between the hook 35 of the stopper locking device 33 and the arm portion 15 of the safety stopper 13, and then move the stopper claw 19 and the mast 1. The motor switch lever 12 is operated with the front surface of the carriage 7 in contact with the claw 5, and the carriage 7 is raised.

At this time, the horizontal surface 37 of the stopper locking tool 33 comes into contact with the lever stopper 43, and this lever stopper 43 rotates counterclockwise, but the carriage 7 rises and the contact between the horizontal surface 37 and the lever stopper 43 is released. At this time, the spring 45 returns it to the normal position.

Thereafter, the carriage 7 rises and lifts the vehicle while the safety stopper 13 rotates back and forth. At the specified position of the carriage 7, turn the motor switch lever 1.
2 to stop the motor, the upper surface of the pawl 5 engages with the stopper pawl 19, and the carriage 7 is stopped and held at this position.

When lowering the vehicle, use the safety stopper 13.
The arm portion 15 of the motor is engaged with the hook 35 of the stopper locking tool 33, and with the stopper claw 19 and the claw 5 disengaged, the motor switch lever 12 is operated to lower the carriage. Therefore, the carriage 7 can be lowered smoothly and only by operating the motor switch lever 12, resulting in safety and good workability.

Also, the carriage 7 is lowered and the stopper locking tool 3
When the horizontal surface 37 of 3 and the lever stopper 43 come into contact, the stopper locking tool 33 is rotated clockwise against the biasing force of the spring 39, and the locking between the hook 35 and the safety stopper 13 is released. The stopper claw 19 comes into contact with the front surface of the mast 1 and the carriage 7
falls further. Therefore, when the stopper pawl 19 descends past the lowest pawl 5, the stopper pawl 19
The contact between the front surface of the mast 1 and the claw 5 is automatically ensured, and the safety of the next lifting operation of the carriage 7 can be ensured.

〔Effect of the invention〕

According to the present invention, when the carriage is lowered to a predetermined position, the stopper locking tool contacts the lever stopper to release the engagement between the safety stopper and the stopper locking tool, and the stopper claw can contact the claw. This has the effect of ensuring safety the next time the carriage is raised.

Furthermore, since the disengagement between the safety stopper and the stopper locking device is performed by the stopper locking device provided on the carriage and the lever stopper provided on the mast cover, it is difficult to lift heavy objects regardless of the means used to raise the carriage. The effect of ensuring safety can be obtained.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a conventional two-post lift device, FIG. 2 is a sectional view taken along the - line in FIG. 1, and FIG. 3 is a side view schematically showing the relationship between the stopper pawl and the pawl. FIG. 4 is a perspective view showing an embodiment of a two-post lift device according to the present invention, FIG. 5 is an enlarged perspective view of the main part of FIG.
The figure is a side view of FIG. 4. 1...Mast, 3...Mast cover, 5...
Claw, 7...carriage, 11...guide arm,
13...Safety stopper, 17...Spring, 1
9... Stopper claw, 33... Stopper locking tool, 3
5...Hook, 37...Horizontal surface.

Claims (1)

[Claims] 1. A mast provided with claws at predetermined intervals in the vertical direction, a carriage provided with a guide arm fitted to the mast and movable in the vertical direction and capable of mounting a vehicle, and a mast cover that covers the mast and the carriage. , a safety stopper having a stopper pawl that is pivotally supported by the carriage and capable of engaging with the pawl and is biased in a direction in which the stopper pawl comes into contact with the pawl; a stopper locking device that can be locked and released; a lever stopper having one end pivotally supported at a predetermined position below the mast cover and the other end abutting the stopper locking device; and a spring biasing the lever stopper clockwise. A two-post lift device comprising: means for disengaging the safety stopper from the stopper locking device, which comprises a protrusion that holds the lever stopper at a predetermined angle.