JPH0328080Y2 - - Google Patents

Description

[Detailed description of the invention] A. Field of industrial application The invention relates to a fall prevention device for a buried two-post lift.

B. Prior Art Conventionally, as shown in Fig. 1, a fall prevention device for a buried type two-post lift has a rack A provided on the wall of a pit box, and a claw B provided on a connecting body connecting two lifting columns. , is constantly engaged with the latch a by the spring c of the spring c, and prevents the connecting body from descending while only being able to ascend. Also, when descending, the release cam d in contact with the other end of the claw is rotated. By moving the claw, the claw was disengaged from the rack a, the engagement was released, and the claw was lowered.

C. Problems to be Solved by the Invention In the conventional drop prevention device described above, in order to raise the lift again after lowering it to the lowest position, the release cam must be rotated again to easily engage the claw.
Also, if the spring that urges the claws to always engage easily becomes rusted and no longer works, or is damaged, the lift may be raised without the claws being easily engaged, and then stopped at a predetermined height. Even if you try to
The lift fell down along with the vehicle it was placed on, which was very dangerous.

D. Means for Solving the Problems In view of this point, the present invention is designed to automatically and easily engage the latch when the lift is at its lowest position, and lift it up with the latch remaining disengaged. The object of the present invention is to provide a fall prevention device for a lift, which prevents the lift from falling by itself even if the lift stops at a predetermined height. is as follows.

That is, a rack provided vertically along the sides of the two columns supporting the vehicle mounting base of the buried type two-post lift, a latch that engages and releases the rack by rotation, and a latch that engages and releases the rack at one end. A latch shaft is provided with a weight at the other end that constantly applies a rotational force in the direction of engaging the latch with the rack, and a subshaft is attached to the side in parallel, and a latch shaft is bored in the ceiling wall of the pit box. an operating rod which is fitted into the hole in the latch shaft and biased upwardly by a spring so as to be able to push down the head on the vehicle platform at the lowest position of the lift; The contact arm is pivotally supported on a camshaft, and the tip of the contact arm is pushed down by a pin provided on the operating rod. The gist is that the contact surface is switched between the tip edge and the upper edge of the contact arm, and the camshaft can be rotated in conjunction with the vertical movement of the operating rod.

E. Function When lifting up, the latch successively passes over the engaging portions of the rack, allowing the vehicle platform to rise only, and when lowering, the operating rod is pulled up to disengage the latch. When the vehicle platform is lowered to its lowest position, the operating rod is pushed downward, which causes the latch to engage with the latch. Even if the vehicle platform is raised again, the switching resistance of the contact surface of the abutting arm against the subshaft causes the latch to engage with the latch. The engaged state is maintained.

Example An embodiment of the present invention will be described based on the drawings.

In Figures 2 to 4, reference numeral 1 indicates a pit provided on the floor, and a column 2, which has a vehicle mounting platform at the upper end and moves up and down, is erected in the pit, and the side surface of the column 2. A rack 3 is provided in the vertical direction. Reference numeral 4 denotes a latch which changes into an engagement position in which it engages with the rack 3 and a release position in which it is released by rotating, and has a weight 5a at one end, and a subshaft 5b on the side. are pivoted on a parallel latch shaft 5, which is always rotated by the weight 5a in the direction in which the latch engages with the rack. Reference numeral 6 denotes a contact arm that rotates the latch shaft 5 by contacting the subshaft 5b, and includes a pair of plate bodies 6a, each of which has one end pivotally supported by a camshaft 7 provided across two lifting columns. 6
b, and a connecting body 6c that connects each free end of the plate bodies 6a and 6b. Further, the rotational vertical movement of the contact arm 6 causes the seat plate 8a to be attached to the head, and
This is performed by an operating rod 8 having two pins 8b and 8c on the body, which is inserted into a hole drilled in the ceiling wall of the pit box.
It is biased upward by a spring 9 contracted at the bottom, and is set at a position where the seat plate can be pushed down by the vehicle mounting base at the lowest position of the lift.

In this embodiment, all fall prevention mechanisms except for the operating rod are symmetrically provided at both ends of a camshaft 7 that pivotally supports one end of a pair of plates 6a and 6b constituting the abutment arm 6. The latches at both ends engage with their respective latches by the action of separate operating rods, but if one operating rod is provided on each side, the engagement will be more secure.

Next, the operation of the fall prevention device according to the present invention will be explained. When a vehicle is placed on the vehicle mounting platform and the two supports are raised, the latch 4 is moved from the rack 3 by the weight 5a provided at one end of the latch shaft 5. By riding over the engaging portions one after another, it moves upward, allowing only its ascent, and preventing the vehicle platform from descending. At this time, the free end of the contact arm 5 rotates downward, and the operating rod 8 is pushed downward. Next, when lowering the lifted lift, pull the operating rod 8 upward, the tip of the contact arm 6 will rise, and the latch 4 will
is disengaged and the strut can be lowered. When the vehicle platform is lowered to the lowest position, the vehicle platform comes into contact with the head seat plate 8a of the operating rod 8 and pushes down the operating rod 8, so that the latch 4 engages with the rack 3. . Therefore, if you lift up a vehicle and perform work, then lower the lift and lift up another vehicle again,
Since the operating rod 8 is always pushed down, it is ensured that the latch is easily engaged.

When the lift-up is activated here, the operating rod 8 is biased upward by the spring 9 at the lowest position of the lift so that the head can be pushed down on the vehicle mounting base, but the latch 4 is pivotally supported. A weight 5a is attached to the latch shaft 5, which constantly applies a rotational force in the direction of engaging the latch 4 with the rack 3, and the operating rod 8 and the latch shaft 5 are pivotally supported by the camshaft 7, A contact arm 6a whose tip is pushed down by a pin 8b provided on the rod 8, and a latch shaft 5
The contact surface of the subshaft 5b with respect to the contact arm 6a is switched between a tip edge and an upper edge as the operating rod 8 moves up and down. During this switching, the subshaft 5b has to get over the corner of the plate 6a, but the latch shaft 5 is not supported by the weight 5a against the force of the spring 9 that urges the operating rod 8 upward. Since rotational force is applied in the opposite direction to the operating rod 8 at the lowest position, even if the downward force is lost, the subshaft 5b must be pulled up a little due to the switching resistance of the contact surface. It is not possible to get over the corner of 6a, and the state remains at the lowest position.

The role of the spring 9 and the weight 5a is to have the function of ensuring that the switch is held in one of two selected positions, like an electric changeover switch (snap switch). Perform the operation reliably.

Therefore, there is no risk of lifting up the next vehicle while the engagement is released.

Effects According to the present invention, when the vehicle platform is lowered to its lowest position, the vehicle platform reliably pushes down the operating rod in the direction of easily engaging the latch.
When the lift is to be raised again, the rack is automatically engaged, preventing the vehicle platform from being raised with the latch not engaged, and thus stopping the lift from rising. Therefore, there is no risk that the vehicle mounting platform will fall in case of an accident. Therefore, it is possible to prevent unexpected falls, which is extremely safe, and has great practical value.

[Brief explanation of the drawing]

Fig. 1 is a conventional fall prevention device for a buried type two-post lift, Fig. 2 is a sectional view showing an embodiment of the present invention, Fig. 3 is a sectional view taken along line A-A in Fig. 2, and Fig. 4 is a sectional view showing an embodiment of the present invention. 1 is a partially enlarged cutaway view of an embodiment of the present invention; FIG. 1... Pit, 2... Pillar, 3... Rack, 4
... Latch, 5 ... Latch shaft, 6 ... Contact arm, 7 ... Camshaft, 8 ... Operation rod.

Claims (1)

[Scope of utility model registration request] A rack provided vertically along the sides of the two columns supporting the vehicle mounting base of the buried type two-post lift, a latch that engages and releases the rack by rotation, and the latch is pivoted at one end. A latch shaft, which is provided with a weight that constantly applies a rotational force in the direction of engaging the latch with the rack at the other end, and has a subshaft attached in parallel to the side thereof, and a latch shaft that is bored in the ceiling wall of the pit box. an operating rod that is fitted into the hole and biased upward by a spring so that the head can be pushed down on the vehicle platform at the lowest position of the lift; and a camshaft whose base end is arranged parallel to the latch shaft. and a contact arm whose tip is pushed down by a pin provided on the operating rod, and the subshaft connects the tip of the contact arm and the subshaft by the rotation of the contact arm. A drop prevention device for a buried two-post lift, in which the contact surface is switched between the tip edge and the upper edge of the camshaft, and the camshaft can be rotated in conjunction with the vertical movement of the operating rod.