JPS644933B2 - - Google Patents

Description

[Detailed Description of the Invention] In a weight type tension balancer, if the weight falls due to a break in the overhead contact line or contact wire holding wire, it will not only destroy the balancer device but also cause secondary disasters to the surrounding area. There is a risk of causing The present invention relates to a device for preventing this, and is designed to instantly lock the weight that is about to fall to the left and right rods.

Examples will be described with reference to the drawings. Large and small pulleys W and w are supported by a pillar P via brackets 1 and 2. Rope 3 for holding the overhead line is attached to the small pulley w.
The ropes 4 for suspending the weight G are connected to the large pulleys W, respectively. The upper and lower brackets 5 and 6 are horizontally fixed to the pillar P below the pulley, and both ends thereof are connected by left and right rods 7 and 7. The weight G is movable up and down along the left and right rods 7, and is suspended by a rope 4 via a hanging rod 22.

1 to 4, the frame F has both ends engaged with the left and right rods 7, and is movable up and down along the rods, and is located on the lower surface of the weight G. The bottomed spring tube 8 is supported at the center of the frame F so as to be movable up and down. Hanging rod 2
2 has its upper end locked to the large pulley W as described above, passes freely through the center hole of the weight G, and its lower end is locked to the lower surface of the spring cylinder 8. The spring 9 is housed in the spring cylinder 8, and is appropriately compressed to press the back surface of the lowermost weight G. Convex metal fittings 10 provided with clevises are protruded and fixed to both sides of the spring cylinder 8. The bearing fitting 11 has a U-shaped cross section and includes a shaft 12, faces the convex fitting 10 with the opening facing inside, and is fixed to the frame F. Rod 7 contacts the inner surface of this U-shaped base. The swing lever 13 is pivotally supported by the shaft 12 at the center, and has an oval hole 13 provided at one end.
It is pivotally connected to the convex metal fitting 10 by a pin 14. That is, when the spring tube is lowered relative to the frame F, the swing lever 13 swings, and the other end comes into frictional contact with the surface of the rod 7.

The present invention is configured as described above. Now consider the case where a tram line breaks. The tension on the rope 3 disappears, and both pulleys rotate rapidly, and the weight G and the frame F try to unite and fall. However, due to the action of the spring 9, which momentarily loses its compressive force, the spring cylinder 8 is lowered relative to the frame F, bringing one end of the swinging lever 13 into frictional contact with the rod 7. This stops the fall. FIG. 4 shows the state at this time.

FIG. 5, FIG. 6, and FIG. 7 show other embodiments.
In FIG. 5, an inclined metal fitting 15 having a surface inclined with respect to the rod 7 is fixed to the frame F.
A swinging lever 16 whose central portion is supported by a pin 14 has one end engaged with the convex metal fitting 10, and the other end is curved so that it can be entered into a wedge shape along the above-mentioned slope. Coercion is possible.

FIG. 6 is an example of using a plurality of springs.
An arm 23 is fixed to the lower end of the hanging rod, a spring support piece 23a is provided at a symmetrical position on the arm, and a compression spring is inserted between it and the weight G. A convex metal fitting 23b is provided at both ends of the arm, and one end of the swing lever 13 is engaged with this metal fitting 23b. With this, the left and right swing levers 13,
13 works in a well-balanced manner.

Unlike the above, FIG. 7 shows an example in which the frame F is above the weight G. The frame F is suspended from the lower end of the rope 4 by a hanging fitting 17. The spring cylinder 18 is a frame F
is fixed to. A presser plate 19 is placed on top of the internal spring 9.
There is a tension rod 20 whose upper end is fixed to the holding plate 19.
freely passes through the bottom of the spring cylinder and supports the weight G at its lower end. The spring cylinder 18 is provided with vertical grooves 18a on both sides, and a convex metal fitting 10 whose one end is fixed to a presser plate passes through the vertical grooves so as to be able to move up and down. A swing lever 13 is pivotally mounted at the center of a shaft 12 provided on the frame F, and an oval hole 13a is bored in one end thereof. One end of the link 21 is engaged with this oval hole by the pin 14, and the other end is pivotally connected to the convex metal fitting 20. That is, as the presser plate 19 rises, the link rotates the swinging lever and brings one end of the link into frictional contact with the rod 7. Therefore, due to the contact wire breakage, the spring 9 is attached to the holding plate 1.
9 is pushed up, thereby swinging the swing lever.

The following structures are known which serve the same purpose as the present invention. A tooth-shaped notch is provided on the outer diameter of the large pulley, a stopper rod is projected from the pillar P below the cutout, and the large pulley is supported by the stopper rod as it descends in an arc due to a break in the overhead contact line. However, in this structure, the large pulley must be made of a cast product due to the provision of the tooth-shaped notches, which inevitably increases the weight. As a result, it is only used in some small balancers, and most ordinary balancers lack fall prevention devices. In contrast, the present invention can be applied as is to a balancer equipped with a conventional large pulley made of steel. This can be accomplished by simply adding a relatively lightweight frame below or above the weight. The feature is that it can be easily used for all balancers, regardless of whether they are large or small.

[Brief explanation of drawings]

Fig. 1 is a front view of the present invention, Fig. 2 is a front view of the vicinity of the frame, Fig. 3 is a sectional view taken along AA, Fig. 4 is an explanatory diagram of operation, Figs. 5, 6, and 7. Both are front views of other embodiments. W, w... Large and small pulley, P... Pillar, G... Weight, F... Frame, 1, 2... Bracket, 3, 4... Rope, 5,
6... Bracket, 7, 7... Rod, 8... Spring tube,
9... Spring, 10... Convex metal fitting, 11... Bearing metal fitting, 12
...shaft, 13...swing lever, 14...pin, 15...slope metal fitting, 16...swinging lever, 17...hanging metal fitting, 18...spring tube, 18a...vertical groove, 19...pressing plate, 20...tension rod , 21...Link, 22...Hanging rod, 23...Arm, 23a...Spring support piece, 23b...Convex metal fitting.

Claims (1)

[Scope of Claims] 1. A large and small pulley supported by a pillar, upper and lower brackets horizontally fixed to the pillar below, left and right rods fixed to the upper and lower brackets, and a plurality of weights that can be raised and lowered along the left and right rods. A frame body is attached to a tension balancer having a weight and is movable up and down along the left and right rods, a spring support body is inserted into the center of the frame body and holds a spring, and the upper end is latched to a large pulley via a wire. A hanging rod that supports the weight load via the spring, a bearing fitting that faces the spring support from the outside in the longitudinal direction of the frame and is fixed to the frame, and a shaft attached to the bearing fitting in the center. A weight fall prevention device comprising a swinging lever which is rotatably supported on a shaft, one end of which engages with an interlocking piece that interlocks with the deflection of the spring, and the other end of which is frictionally engaged with a rod. 2. The frame body is located on the lower surface of the weight, and the lower end of the suspension rod that can penetrate the center of the frame body is equipped with a bottomed spring tube for storing the spring, and the convex metal fittings protruding left and right from the spring tube are used as one end of the swing lever. The engaged weight fall prevention device according to claim 1. 3 Place the frame on the lower surface of the weight, include the bottomed spring tube described in the preceding paragraph, fix a metal fitting with a surface inclined to the rod to the frame, and make one end of the swinging lever protrude from the spring tube to the left and right. The weight fall prevention device according to claim 1, wherein the weight fall prevention device is engaged with a convex metal fitting, and the other end is curved so as to be movable along a slope. 4. A method for preventing the weight from falling as set forth in claim 1, characterized in that the frame body is located on the lower surface of the weight, the interlocking piece is an arm fixed to the lower end of the hanging rod, and springs are provided symmetrically to the left and right of the arm. Device. 5 A frame body is suspended from the lower end of the wire, a spring cylinder is fixed to the frame body, a holding plate is provided so that the storage spring can be lowered, and the upper end is latched to this holding plate, and a tension rod that freely passes through the bottom of the spring cylinder is attached. The weight fall prevention device according to claim 1, wherein the weight is supported at the lower end, and the swing lever is movable in conjunction with the lifting and lowering of the presser plate.