JPS5842073Y2 - Dust collector suction hose bending device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a suction hose bending/extending device for a dust collector that allows the tip hood of the suction hose of a dust collector to be rotated in a desired direction with a single touch and to be securely fixed at that position.

A sufficient dust collection effect cannot be obtained unless the hood at the end of the suction hose of the dust collector is directed toward the dust source.

In this case, if the dust source is stationary (for example, a grinder, cutting machine, welding workbench), the direction of the suction hose end hood may be fixed; however, if the dust source is moving (for example, if a hand grinder is used) (during construction work or sheet metal welding work), the suction hose tip hood must be able to freely change direction in accordance with the movement of the dust source.

BACKGROUND ART Conventionally, a dust collector shown in FIGS. 1 and 2 has been known in which the direction of the hood at the end of a suction hose of a dust collector can be changed.

In the case shown in FIG. 1, the middle of the suction hose 2 of the dust collector body 1 is supported by a pedestal 3, and by moving the pedestal 3 toward the dust collector body 1 side or toward the tip hood 4 side, the suction hose 2
The tip hood 4 was made to face the direction of the dust source by adjusting the bending position and angle of the pedestal 3, but considerable care was required to move the pedestal 3 without tipping it over, and the worker was forced to This resulted in a lot of trouble, and it was impossible to fix the direction of the tip hood that had been selected.
Moreover, it has various drawbacks, such as the frame 3 getting in the way during welding work.

The one in FIG. 2 includes a single arm 7a whose base end is fixed to the dust collector main body 1 with a fixed upward angle, and the single arm 7a.
The suction hose 2 is suspended via a band body 8 to a bendable arm 7 consisting of an arm unit 7b which is bendably connected to the arm 7b via a pin 5 and a spring body 6.

The bending/extending arm 7 maintains its bending/extending angle by the frictional resistance of the contact portion between the two arm units 7a, 7b and the spring force of the spring body 6.

Therefore, in order to increase this frictional resistance, the single arm 7
A and 7b had to have a certain width, and because they would be electrolytically distorted, they were not installed inside the suction hose 2 and were visible from the outside, making the appearance extremely unsightly.

Furthermore, the contact area between the two arms 7a and 7b is naturally limited, and therefore the frictional resistance between them is also limited.
In order to compensate for this frictional resistance, in many cases, the pin 5 is provided with a male thread, and a wing nut (not shown) is screwed into this, and the wing nut is loosened when changing the direction of the end hood 4 of the suction hose 2. , tightening, etc., but this resulted in extra trouble for the operator.

This invention solves all of these shortcomings of the conventional device at once; the bending arm is not exposed to the outside of the suction hose, and the suction hose has resistance to friction between the lobe winding drum and the rope wound around the lobe winding drum. An object of the present invention is to provide a suction hose bending/stretching device for a dust collector which can be bent/stretched with a single touch by the action of a bending/stretching arm utilizing the bending/stretching arm, and can also securely hold a desired position.

Next, this invention will be explained by referring to the embodiments shown in FIGS. 3 to 7.

In FIG. 3, 10 is the dust collector main body, 11 is the suction port pipe of the dust collector main body 10, and the suction port pipe 11 is loosely fitted into the dust collector main body 10 so that it can freely rotate in the circumferential direction.

12 is a flexible suction hose connected to the suction port pipe 11, and has a trumpet-shaped tip hood 13.

Reference numeral 14 denotes a bending arm provided inside the suction hose 12, and the bending arm 14 includes a single arm 14a that pivots around the central axis 15' of the robe winding drum 15, and a single arm 14a fixed to the body wall of the robe winding drum 15. 14b are installed in series.

Of course, the cross-sectional shape of the arms 14a, 14b is not limited to that shown in the drawings.

The base end of the bending and extending arm 14 (in the figure, the arm unit 1
4a) is fixed at a constant upward angle to the stay 16 installed between the inner surfaces of the suction port pipe 11, and the tip (in the figure, the tip of the arm unit 14b) is attached to the tip of the suction hose 12. It is fixed to a stay 17 provided between the inner surfaces of the base of the hood 13.

Reference numeral 18 denotes a rope that is wound around the lobe winding trunk 15 once or twice or more, and one end 18' of the rope 18 is fixed to a pin 19 planted on the upper surface of the arm unit 14a that pivotally supports the lobe winding trunk 15. , the other end 18'' is fixed to the other end of a spring body 20, which has one end latched to a pin 19' implanted on the lower surface of the arm unit 14a.

Therefore, the arm unit 14a constituting the bending/extending arm 14,
14b is temporarily fixed by the frictional force between the lobe winding drum 15 and the rope 18 wound around it.

Now, when a force is applied to the arm unit 14a in the direction of arrow A in FIG. 5, a rotational force in the direction of pulling the rope 18 on the spring body 20 side is applied to the lobe winding drum 15, which is integrated with the arm unit 14b.

Therefore, the spring body 20 is stretched by this frictional force, the rope 18 wound around the lobe winding cylinder 15 is loosened, the frictional force is weakened, the lobe winding cylinder 15 begins to slide, and rotates about the central axis 15'.

On the contrary, when a force in the direction of arrow B is applied to the arm unit 14b, a rotational force is applied to the lobe winding drum 15 in a direction to pull the fixed side of the rope 18.

For this reason, the frictional force between the lobe winding drum 15 and the rope 18 wound around it will increase due to the self-boosting effect, but if a force exceeding this increase is applied, the lobe winding drum 15 will be forced to tighten the rope 18. It slides out and rotates against frictional resistance.

In this way, the bending/extending arm 14 is difficult to rotate in the direction of arrow B due to the rotation of the single arm 14b in the direction of arrow A, and the bending/extending arm 14 is difficult to rotate in the direction of arrow B due to the action of the self-boosting force. The own weight and the weight of the hood 13 can be sufficiently supported.

Therefore, the bending/extending arm 14 is reliably fixed at that position even when the arm unit 14b is bent at any angle, and it is possible to accurately align the direction of the tip hood 13 with the dust source.

The force for bending and stretching the bending and stretching arm 14 can be freely changed by changing the rope wrapping surface of the winding drum 15, the shape and material of the rope, the spring force of the spring body 20, and the number of turns of the rope. .

FIG. 6 shows a second example of the bending arm 14.

This bending arm 14 has robe winding trunks 15 a and 1 at both ends.
A single arm 14a' that pivots the central axes 15a' and 15b' of the lobe winding trunk 15C at one end, and the other end supports the tip hood 13 of the suction hose 12. An arm unit 14a'' is fixed to a stay 17 extending between the inner surfaces of the bases of It consists of a single arm 14b' fixed to the rope winding trunk 15, and a single arm 14b'' whose both ends are fixed to the trunk wall of the rope winding trunk 15b, 15C.
One ends 18 a' and 18 b' of the ropes 18 a and 18 b wound around the arms a and 15 b are attached to the arm unit 14 a' (
7) It is fixed to the upper surface with a common stopper 21, and the other end 18a
"18b" is fixed to both ends of the common spring body 20.

Further, one end 18C' of the rope 18C wound around the lobe winding body 15C is fixed to the upper side of the stay 17 of the tip hood 13 to which the arm unit 14a'' is fixed, and the other end 18C'' is attached to the lower side of the same stay 17. It is fixed to the other end of the spring body 20 which is fixed at one end.

In the case of this flexible arm 14, the arm unit 14a' is connected to the arrow C
-C' direction, and the arm unit 14b''
can rotate in the direction of the arrow D-D' relative to the arm unit 14a', and the arm unit 14a'' can also rotate in the direction of the arrow E-E' with respect to the arm unit 14b'', compared to the case of the previous example. Although the degree of freedom in bending and stretching is extremely large, the effect of the self-boosting action of the loaf eccentric body and the rope is the same as in the previous case.

As described above, according to this invention, since the bending arm is provided inside the suction hose, the appearance is not damaged unlike in the conventional case, and the bending arm is caused by friction between the rope winding body and the rope wound around it. Since self-boosting works, it can withstand the arm's own weight and the weight of the hose and hood,
Moreover, the tip hood can not only be oriented precisely to the dust source with a single touch, but also securely fixed in the desired direction, resulting in good workability.

In addition, it is structurally cylindrical and can be made smaller in size compared to conventional bending/extending arms. The curved surface of the rope winding body prevents damage to the inner surface of the hose.

Furthermore, in this invention, since the bending arm is located inside the suction hose, it appears that the above function may be impaired due to the accumulation of dust flowing inside the suction hose, but since a rope is used, As shown in Fig. 7A, the dust particles 22 accumulated on the friction surface of the rope winding drum are reliably removed as shown in Fig. 7B, and the condition of the friction surface remains constant, and the above functions are not impaired at all. It has various excellent effects.

[Brief explanation of drawings]

Figures 1 and 2 are side views showing a conventional example, Figure 3 is a sectional side view showing the first example of this invention, Figure 4 is a perspective view of the rope winding trunk, and Figure 5 is a bending arm. 6 is a perspective view showing a second example of the bending/extending arm, and FIG. 7 is a sectional view showing dust accumulated on the rope winding drum and removed by the rope. 10...Dust collector body, 11...Suction port pipe, 12...Suction hose, 13...Tip hood, 14...Bending arm , 14a, 14
b...Arm alone, 15...Rope winding trunk, 16゜17...Stay, 19...
Pin, 18...rope, 20...spring body.

Claims (1)

[Scope of utility model registration request] In the suction hose connected to the suction port pipe of the dust collector body, there is a bending arm consisting of a single arm that pivots the center axis of the rope winding drum and a plurality of single arms that are fixed to the body wall of the rope winding drum. , fixedly provided between the suction port pipe and the end hood of the suction hose, one end of the rope wound around the rope winding body being fixed to the upper surface of a single arm that pivotally supports the central axis of the rope winding body; A suction hose bending device for a dust collector whose end is fixed to the lower surface of the same arm via a spring body.