JP3011759U - Chair seat rotation support device - Google Patents

Abstract

(57) [Summary] [Purpose] Smoothly rotate the seat of a chair supported by a supporting leg made of a metal pipe fixed so as to stand upright. [Structure] A flange is provided in the middle of the vertical axis, a fork is provided at the upper end of the vertical axis, and a diameter is provided at the lower end surface of a cylinder rotatably fitted to the vertical axis below the flange. A cam part that is cut so as to gradually descend from one end opposite to the other end in the direction is provided, and the upper bearing plate provided at the upper end of the vertical plate is fixed to the lower end of the vertical axis. The shaft rod is vertically penetrated between the lower bearing plate provided at the lower end of the shaft and the upper bearing plate, and the rounded portion at the upper end of the shaft rod is brought into contact with the ascending end portion of the cam portion, A coil spring is suspended between the lower bearing plate and a flange portion provided at a position slightly lower than the upper bearing plate.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a seat rotation support device for a chair, which is mainly installed in front of each pachinko machine in a pachinko parlor.

[0002]

[Prior art]

 In a conventional device of this type, as shown in FIG. 3, a collar portion 2 is integrally formed at a position where it is lowered from the upper end of the vertical axis 1 made of metal by about one third, and the flange portion 2 is provided at the upper end of the vertical axis 1. The leading portion has a large diameter on the side of the collar portion 2 and is tapered so that the diameter becomes gradually smaller toward the upper end. A forked portion 3 is provided at the upper end of the vertical axis 1, and from the collar portion 2 to the vertical axis. 1 is formed into a cylindrical surface 4 having the same diameter, and the portion from the cylindrical surface 4 to the lower end of the vertical axis 1 is formed into a slide surface 5 in which both side surfaces of the cylindrical surface are cut flat. Then, a metal cylinder 6 is rotatably fitted to the cylindrical surface 4, an enlarged diameter portion 7 is provided at the upper end of the cylinder 6, and a bearing 8 is fitted inside the enlarged diameter portion 7. Then, a washer 9 is fitted between the upper surface of the bearing 8 and the lower surface of the collar portion 2, and one end portion 1 that is diametrically opposed to the lower end surface of the cylinder 6 is fitted. From one end to the other end 11 so as to gradually descend to provide a cam portion 12 having a rising end portion 10 and a descending end portion 11. The slide surface 5 has the same cross-sectional shape as the slide surface 5. A slider 14 formed of hard plastic so as to have the hole 13 of the same diameter as the outer diameter of the cylinder 6 is slidably fitted. Is cut so as to gradually descend from one end portion 15 to the other end portion 16 facing each other, and a cam portion 17 having a rising end portion 15 and a descending end portion 16 is provided, and the rising end portion of the cam portion 17 is provided. A metallic sphere 18 is embedded in 16 so that a part thereof protrudes. A coil spring 19 is wound around the outer periphery of the slide surface 5 that descends from the lower end of the slider 14, and the upper end of the coil spring 19 is Under slider 14 A washer 20 is pressed against the lower end of the coil spring 19, and a screw bolt 22 is formed from the lower surface of the washer 20 through a spring washer 21 at the lower end of the vertical axis 1. The coil spring 19 is compressed to push up the slider 14 and the cylinder 6 by its elasticity, and the upper end of the cylinder 6 is brought into pressure contact with the lower surface of the collar portion 2 via the bearing 8 and the washer 9, and the spherical body 18 is cammed. Some of them are assembled so that they are brought into pressure contact with the rising end portion 10 of the portion 12 and the cam portion 17 is brought close to the cam portion 12.

As shown in FIGS. 3 and 4, the seat rotation supporting device of the chair having the above-described structure is provided with guides in the front-back direction provided on both sides of the lower surface of the base plate 24 for fixing a seat (not shown). The slide box 26 is provided between the front end portion 27 of the slide box 26 slidably engaged with the rails 25, 25 and the end plate 29 attached to the rear end of the base plate 24 with screw bolts 28, 28. The coil springs 30 and 30 for constantly urging the base plate 24 toward the rear end of the base plate 24, and the upper end of the vertical axis 1 is inserted into the hole 31 formed in the center of the bottom plate of the slide box 26. An upper end opening of a support leg 33 which is upright by inserting the forked part 3 into a connecting plate 32 installed inside the slide box 26, and which is a support leg made of a metal pipe and whose lower end is embedded in a concrete floor or the like. From support The portion extending from the screw bolt 22 to the cylinder 6 is inserted into the inside of 33, and the stepped portion 34 formed outside the upper end of the cylinder 6 is received by the upper end of the support leg 33 by the enlarged diameter portion 7 provided at the upper end of the cylinder 6. In order to prevent the cylinder 6 from coming off the support leg 33, the cylinder 6 is mounted by spotting the cylinder 6 from four locations on the outer circumference of the support leg 33 at equal intervals.

[0004]

[Problems to be solved by the device]

 In the chairs installed as described above, when a person playing a slingshot pulls the seat backwards against the elasticity of the coil springs 30 and 30 and sits down on the seat, the elastic restoring force of the coil springs 30 and 30 is applied to the seat. It acts to return the seat to its original position, that is, the position close to the pachinko machine. In this state, you will be playing a pachinko ball inside the pachinko machine, but when a person leaves the seat in the middle of that operation or when the operation ends, while sitting on the seat, After pushing the seat backwards against the elastic force of the coil springs 30, 30, the seat is rotated clockwise or counterclockwise and then stands up. Since the rotation of this seat is transmitted to the slider 13 via the base plate 24 and the vertical axis 1, the spherical body 18 projecting from the rising end 16 of the cam portion 17 moves from the rising end portion 10 of the cam portion 12 to the descending end portion 11 side. At the same time as the sphere 18 descends while pressing, the slider 14 is pushed down against the elasticity of the coil spring 19 and the coil spring 19 is compressed, but during the above operation, the cylinder 6 and slider 14 move. The coil spring 19 is applied with a large force of about 110 kg, which is a force inclined to the right when viewed from the center line of the vertical axis 1 shown in FIG. There were drawbacks that the rotation became slower and the seat did not rotate smoothly, or some seats did not rotate even when trying to rotate it. An object of the present invention is to provide a seat rotation support device for a chair that can eliminate such drawbacks.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a collar portion in the middle of the vertical axis, a forked portion at the upper end of the vertical axis, and a vertical axis below the collar portion. A cylinder is rotatably fitted, and the lower end face of this cylinder is cut so that it gradually descends from one end facing the other in the diametrical direction to the other end, and the rising end and the falling end are cut. The upper bearing plate horizontally provided from the upper end of the vertical plate is fixed to the lower end of the vertical axis, and the horizontal lower bearing plate is attached to the lower end of the vertical plate. A shaft rod having a rounded portion at the upper end is vertically passed through the upper bearing plate, and the upper end of the shaft rod is brought into contact with the ascending end portion of the cam portion. A flange is provided at a position slightly lower than the lower shaft, and the shaft rod is wound between the flange and the lower bearing plate. Is characterized in that the suspension coil spring that.

[0006]

[Action]

 When the seat on which a person is seated rotates clockwise or counterclockwise, and when the rotation is transmitted to the vertical axis, the vertical plate and the shaft rod rotate in the same direction, so the coil at the rising end of the cam part. At the same time that the upper end of the shaft rod, which was pressed by the elastic force of the spring, moves to the falling end side of the cam part, the shaft rod resists the elastic force of the coil spring, and does not tilt from the center line of the vertical axis and moves vertically downward. Since it is pushed down, a small force of about 25 kg is applied to the shaft rod and the coil spring. Then, when the rotation of the seat is not transmitted to the vertical axis, the elastic restoring force of the compressed coil spring acts on the shaft rod, so that the upper end of the shaft rod moves from the descending end side of the cam part to the ascending end part. At the same time, the shaft rod rises vertically upward and returns to its original position.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Reference numeral 35 denotes a vertical axis, and 36 denotes a collar portion integrally formed in an intermediate portion of the vertical axis 35. The portion reaching the upper end has a large diameter on the side of the collar portion 36, and is tapered so that the diameter gradually decreases toward the upper end. Reference numeral 37 denotes a bifurcated portion provided at the upper end of the vertical axis 35, 38 denotes a cylinder rotatably fitted to the vertical axis 35 below the flange portion 36, and an expanded diameter portion 39 is provided at the upper end of the cylinder 38. A bearing 40 is fitted inside the expanded diameter portion 39, a washer 41 is fitted between the upper surface of the bearing 36 and the lower surface of the flange 36, and a lower end surface of the cylinder 38 is fitted. A cam portion 44 having an ascending end portion 42 and a descending end portion 43 is provided by cutting so as to gradually descend from one end portion 42 opposite in the diametrical direction to the other end portion 43. Reference numeral 45 is a vertical plate, and an upper bearing plate 46, which is bent horizontally from the upper end thereof, is fixed to the lower end of the vertical axis 35 by welding. Reference numeral 47 is a lower end plate horizontally bent from the lower end of the vertical plate 45, and 48 is a lower bearing plate having a portion overlapping the lower surface of the lower end plate 47 and a portion protruding from the tip of the lower end plate 47. It is attached by screwing a screw bolt 49 into the lower end plate 47 from the lower surface of the portion overlapping the lower end plate 47. Reference numeral 50 denotes a shaft rod, and a rounded portion 51 is formed at the upper end thereof. The shaft rod 50 is vertically penetrated between the lower bearing plate 48 and the upper bearing plate 46 to form the rounded portion 51 at the upper end. It is brought into contact with the rising end portion 42 of the cam portion 44. 52 is a flange portion of the shaft rod 50 provided at a position slightly lower than the upper bearing plate 46, 53 is a coil spring, and the shaft rod 50 is wound between the flange portion 52 and the lower bearing plate 48. It is suspended and urges the shaft rod 50 so that the upper end rounded portion 51 is constantly in pressure contact with the rising end portion 42 of the cam portion 44.

In the chair seat rotation supporting device having the above-described structure, the upper end of the vertical axis 35 is inserted into the hole portion 31 formed in the center portion of the bottom plate of the slide box 26 in the same manner as the conventional device, and the slide box is inserted into the slide box. Insert the forked part 37 into the connecting plate 32 installed inside 26, and insert the part from the upper end opening of the support leg 33 standing upright from a concrete floor or the like into the support leg 33, and the part from the lower end of the shaft rod 50 to the cylinder 38. Then, the stepped portion 54 formed on the outer side of the upper end of the cylinder 38 is received by the upper end of the support leg 33 by the enlarged diameter portion 39 provided on the upper end of the cylinder 38 to prevent the cylinder 38 from coming off the support leg 33. The cylinder 38 is mounted so as to be spotted from four locations on the outer periphery of the cylinder 38 at equal intervals.

The seat rotation support device for a chair according to the present invention is mainly attached to a chair installed in a pachinko parlor, and is also mounted on a chair installed in a coffee shop or other places so that it is fixed upright. It may be attached to a chair supported by a pipe supporting leg.

[0010]

[Effect of device]

 Since the present invention is configured as described above, when a person sits on the seat and rotates the seat clockwise or counterclockwise, the shaft bar resists the elasticity of the coil spring and the center of the vertical axis. As it is pushed down vertically as shown in Fig. 2 without tilting as seen from the line, a small force is applied to the shaft rod and coil spring, so the pressure contact movement to the cam part at the top end of the shaft rod is made lighter. As a result, the seat can be rotated smoothly, and there will be no malfunction such that the seat will not rotate.

[Brief description of drawings]

FIG. 1 is a side view of a seat rotation support device for a chair according to the present invention.

FIG. 2 is an operation explanatory diagram when clockwise or counterclockwise rotation is transmitted to the vertical axis in the above apparatus.

FIG. 3 is a cross-sectional view of a conventional seat rotation support device for a chair.

FIG. 4 is a view showing a state in which the device of FIG. 3 is mounted between a base plate for fixing a seat and a supporting leg for supporting the seat.

FIG. 5 is a left side view in which a part of FIG. 4 is cut away.

[Explanation of symbols]

35 ... Vertical axis, 36 ... Collar part, 37 ... Bifurcated part, 38 ... Cylindrical part,
42 ... Ascending end, 43 ... Descent end, 44 ... Cam part, 45
... vertical plate, 46 ... upper bearing plate, 48 ... lower bearing plate, 50
... Shaft rod, 51 ... Rounded portion, 52 ... Collar portion, 53 ... Coil spring.

Claims (1)

[Scope of utility model registration request] 1. A collar portion is provided at an intermediate portion of the vertical axis, a forked portion is provided at an upper end of the vertical axis, and a cylinder is rotatably fitted to the vertical axis below the collar portion. The lower end surface of this cylinder is provided with a cam portion having a rising end portion and a descending end portion, which is cut so as to gradually descend from one end portion facing in the diametrical direction to the other end portion, An upper bearing plate horizontally provided from the upper end of the vertical plate is fixed to the lower end of the shaft, a horizontal lower bearing plate is attached to the lower end of the vertical plate, and the lower bearing plate and the upper bearing plate are A shaft rod having a rounded portion at the upper end is vertically penetrated, and the upper end of the shaft rod is brought into contact with the rising end of the cam portion, and at a position of the shaft rod slightly lowered from the upper bearing plate, A chair in which a collar portion is provided, and a coil spring for winding the shaft rod is suspended between the collar portion and the lower bearing plate. Seat rotation support device.