JPH0364397B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a torque adjusting device for a balancer disposed, for example, between a horizontal rotating arm and a vertical rotating arm.

(Prior art) Loading arms used for supplying liquid to tank trucks, freight cars, etc. generally have an inboard arm 1 that rotates horizontally and an outboard arm 2 that rotates vertically, as shown in Figure 1. are connected via swivel joint 3, while both arms 1 and 2 are connected via swivel joint 3.
The structure is such that the load of the outboard arm 2 is canceled by the torsion coil spring 5 of the balancer 4 disposed between them, and the spring force of the torsion coil spring 5 may change due to long-term use. In this case, attach a wrench or the like to the center of one of the spring receivers 6 that is integrated with this, and rotate it.
One of the holes 6a drilled around the spring bracket 7 is aligned with the hole 7a on the spring bracket 7, and a bolt 8 for fixing the spring receiving seat is inserted into each of these holes 6a, 7a.
is inserted, and the torsion coil spring 5 is fixed at the newly adjusted position.

However, with this kind of balance adjustment mechanism,
In devices where a strong torsion coil spring is used depending on the length of the outboard arm, two people must work together to wind up the torsion coil spring 5 and insert and remove the bolt 8. However, there is a problem that winding up the torsion coil spring 5 requires a considerable amount of effort.

(Purpose) The present invention was made in view of the above problem, and its purpose is to provide a new balance adjustment device that allows one person to easily adjust the spring and also allows the necessary amount of adjustment. It's about doing.

(Structure) Therefore, details of the present invention will be described below based on illustrated embodiments.

Figures 2 and 3 show an embodiment of the present invention, and reference numeral 11 in the figures represents a U-shaped frame fixed to the swivel joint 3 to hold the spring adjustment mechanism. is torsion coil spring 1
Upper and lower spring receiving seats 17 and 18, which integrally hold the upper and lower ends of the spring 6, are rotatably mounted. Reference numeral 20 denotes an adjustment bracket that is attached with bolts 21 to some of a plurality of screw holes 19 bored at equal intervals around the lower spring receiving seat 18, and protrudes outward from the spring receiving seat 18. A bolt 22 for adjusting the spring pressure is rotatably supported at the free end of the bolt 22, and its tip is inserted into the hole 13 of the bracket 12 provided on one side of the frame 11, and then inserted into the washer. 23 and is secured by a nut 24.

In addition, the reference numeral 25 in the figure indicates the upper spring receiving seat 17.
A connecting rod 10 connects a part of the outboard arm 2 with the outboard arm 2 and transmits the load of the outboard arm 2 to the spring 16.
In order to prevent the swinging of the frame body 11, a tightening member is shown, one end of which fastens a locking rod 26 that connects a part of the frame body 11.

Next, a balance adjustment operation using the above-mentioned device will be explained.

First, remove the bolts 15 that fix the frame 11 and the spring receiver 18 to release the lower spring receiver 18, and then turn the nut 24 screwed onto the end of the spring pressure adjustment bolt 22. Spring catch seat 18
The torsion coil spring 16 that is integrated with the torsion coil spring 16 is wound and tightened. By this operation, torsion coil spring 1
6 increases its tension and balances the load of the outboard arm 2. Next, align the hole 14 of the frame 11 with the hole 19 of the spring receiver seat 18 at a position near the balance, and insert the bolt 15 there. By inserting it, both can be fixed in the new adjustment position.

If the spring pressure cannot be adjusted sufficiently with a single operation, once the spring receiver 18 is fully rotated, both are fixed with the bolt 15. Once the two are rotated, the bolt 15 is tightened. After fixing both, the adjustment bracket 20 may be moved to a new position and the tightening operation may be performed again.

(Effects) As explained above, according to the present invention, the balance adjustment means for rotating the spring bearing seat of the torsion coil spring that balances the loading arm using a screw mechanism is provided, so that the labor required for winding can be reduced. In addition, the spring can be wound up and fixed by a single worker, and multiple holes are provided near the outer periphery of the spring receiving seat, allowing one end of the screw mechanism to be attached and detached through these holes. Therefore, it is possible to wind up the required amount, and even if the spring becomes flat due to long-term use, balance can be easily maintained.

[Brief explanation of drawings]

1A and 1B are a top view and a side view showing an example of a loading arm, and FIGS. 2 and 3 are a side view and a bottom view of an apparatus showing an embodiment of the present invention. 1... Inboard arm, 2... Outboard arm, 3... Swivel joint, 4... Balancer, 11... Frame, 16... Spring, 1
7, 18...Spring receiving seat, 20...Adjustment bracket, 22...Spring pressure adjustment bolt.

Claims (1)

[Claims] 1. A frame body is fixed to the joint of a loading arm in which the end of a second arm is connected to the end of a first arm that rotates in the horizontal direction via a joint so as to be rotatable in the vertical direction, and A torsion coil spring having a first spring receiving seat fixed to one end and a second spring receiving seat fixed to the other end is rotatably attached to the frame body, and the first
A balance device in which a spring receiving seat is connected to a second arm by a connecting rod, the second spring receiving seat is fixed to the frame body, and the second arm is balanced by the repulsive torque of the torsion coil spring. A plurality of holes are provided near the outer periphery of the second spring receiving seat, one end is detachably attached to the hole of the second spring receiving seat, and the other end is swingably attached to the frame body by a screw mechanism. A balance device for a loading arm, comprising a balance adjustment means for rotating a second spring receiving seat.