JPH06155275A - Curved surface finishing device for helmet neck part - Google Patents

Abstract

PURPOSE:To finely finish a helmet neck part to a curved surface independently of the simple structure and the simple operation, permit the easy disposal even if the size of the helmet is changed or the curved surface shape of the neck part is changed, and prevent the grinding trash from being dropped into the helmet. CONSTITUTION:The upper surface 4a of a shaping mold 4 is formed to the curved surface conforming to the designed shaping curved surface of a helmet neck part 20a, and a grinding belt 2 is allowed to circulate by a belt circulating device 3 through the sliding movement along the upper surface of the shaping mold. A helmet is held by a helmet pressing mechanism, and the neck part is placed on the shaping mold and pressed on the grinding belt, and grinding is executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a curved surface finishing device for a helmet neck portion for finishing a neck portion (opening portion) of a riding helmet.

[0002]

2. Description of the Related Art Conventionally, an apparatus of this type is disclosed in Japanese Patent Laid-Open No.
There is one disclosed in Japanese Patent No. 84811. This device uses a rotary cutter, and cuts the neck portion of the helmet into a curved surface by three kinds of movements of the rotary cutter: vertical movement, forward / backward movement, and left / right swing. That is, in order to receive the helmet with the open neck portion facing upward, the rotating base that holds and rotates the helmet is provided with a concave portion that matches the outer shape of the helmet, and the rotating cutter is moved up and down on the lower side of the rotating base. First cam for moving, second cam for moving back and forth,
A third cam for swinging left and right is provided. Also, engage the cam followers with these three types of cams,
In order to move the rotary cutter following these cam followers, a vertical movement mechanism, a forward-backward movement mechanism, and a left-right swing mechanism of the rotary cutter are respectively provided. Further, in order to fix the helmet in the recess of the turntable, a cylinder is installed above the turntable and the helmet is pushed down by the plunger of the cylinder. This plunger is rotatable.

[0003]

However, this conventional device has the following problems. The whole structure and the structure of each part are extremely complicated and expensive. There are many troubles because the rotary cutter has to make complicated movements. It is difficult to change the size of the helmet and the curved shape of the neck. Since the helmet is fixed and cut with the neck portion facing upwards, the chips fall into the helmet and the removal work is required. Since the cutting is performed by three kinds of movements of the rotary cutter, that is, vertical movement, forward / backward movement, and left / right swing, the cut end cannot be neatly finished and the cut portion must be further ground.

Therefore, an object of the present invention is to eliminate such problems, that is, the helmet neck portion can be finished with a fine curved surface, and the helmet size can be changed and It is an object of the present invention to provide a curved surface finishing device for a helmet neck portion that can easily cope with a change in the curved surface shape of the neck portion and that does not allow grinding dust to fall into the helmet.

[0005]

A curved surface finishing device for a helmet neck portion according to the present invention comprises a molding die 4 having an upper surface 4a which is a curved surface conforming to a designed molding curved surface of a helmet neck portion 20a, and an upper surface 4a of the molding die 4. The grinding belt 2 which is circulated by the belt circulation device 3 while sliding on the top, and the helmet 2
The helmet pressing mechanism holds 0 and presses the neck portion 20a thereof against the grinding belt 2 on the molding die 4.

The helmet pressing mechanism is, for example, as shown in FIG.
As in the example of FIG. 2, a lifting fluid pressure cylinder 22 and a lifting table 2 that is lifted and lowered along the rail 7 by the cylinder 22.
3, a turntable 25 mounted upside down on the lift table 23, a suction cup 31 held on the turntable 25 for adsorbing the outer surface of the helmet 20, and the same rotation for pressing the helmet 20 from above. It is composed of a helmet pressing body 32 held on the table 25.

The helmet pressing mechanism is shown in FIG.
As in the example of FIG. 4, a helmet support arm 35 urged upward by a spring 37 so as to be vertically movable on a erection table 33, and a lifting hydraulic cylinder 34 attached to the erection table 35. It can also be configured with a helmet pressing body 36 that presses the helmet 20 that is mounted on the installation table 33 so as to be lifted and lowered by the lifting fluid pressure cylinder 34 and that is supported by the helmet support arm 35.

The belt circulating device 3 for circulating the grinding belt 2 can be provided with a tension fluid pressure cylinder 15 for pulling or pressing the belt wheel 17 to apply tension to the grinding belt 2.

[0009]

The grinding belt 2 circulates while sliding along the upper surface 4a of the mold 4. When the neck portion 20a of the helmet 20 is pressed against the circulating grinding belt 2 on the forming die 4, the upper surface 4a of the forming die 4 is aligned with the designed forming curved surface of the neck portion 20a. It is ground according to the molding curved surface.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 and 2 show a first embodiment. A belt circulating device 3 for circulating a grinding belt 2 and a molding die supporting device 5 for supporting a molding die 4 from below are installed on a base 1 of this curved surface finishing device, and a cylinder erection support column 6 and two And the guide columns (rails) 7 of the above are vertically installed on the base 1.

The belt circulating device 3 has a motor (electric motor) 8 as its drive source fixed on a base 1, and a bearing base 9 fixed on the base 1 has a V pulley 10 and a drive side pulley 11. Is coaxially supported so that the
Motor pulley 12 and V pulley 10 fixed to the output shaft of the
A V-belt 13 is applied between and to transmit the rotation of the motor 8 to the drive-side belt wheel 11. Further, a tension hydraulic cylinder 15 is pivotally mounted on a bracket 14 fixed on the base 1 so as to be vertically rotatable, and a driven frame belt wheel 17 mounted on a piston rod of the hydraulic cylinder 15 supports a belt wheel 17 on the driven side. is doing.

Then, the grinding belt 2 is hung between the driving-side belt wheel 11 and the driven-side belt wheel 17, and tension is applied to the grinding belt 2 by a tension hydraulic cylinder 15, so that the grinding belt 2 is separated from both sides. Belt car 11.
It is pressed against the upper surface 4a of the molding die 4 at an intermediate position of 17. Therefore, when the motor 8 is driven, the grinding belt 2 moves to the molding die 4
It is circulated while sliding along the upper surface 4a of the. The surface of the grinding belt 2 is a grinding surface like sandpaper.

The forming die supporting device 5 vertically stands a plurality of height adjusting shafts 19 on a belt guide 18 for guiding the grinding belt 2, and the forming die 4 is provided at the upper end of these height adjusting shafts 19.
Is detachably (replaceable) fixed. The upper surface 4a of the molding die 4 is a curved surface that matches the designed molding curved surface of the neck portion 20a of the target helmet 20.

On the other hand, on the cylinder base plate 21 fixed to the upper ends of the cylinder erection pillar 6 and the two guide pillars 7,
The lifting hydraulic cylinder 22 is attached downward, and the slide cylinder portion 23a of the lifting table 23 is slidably fitted to both guide columns 7 so that the lifting table 23 can be raised and lowered on both guide columns 7. It is hung. The lifting platform 23 is connected to the tip (lower end) of the piston rod 24 of the lifting hydraulic cylinder 22, and is lifted and lowered along the guide column 7 by the hydraulic cylinder 22.

A rotary table 25 is supported by the lift table 23 so as to be rotated integrally with a horizontal rotary shaft 26a by, for example, a pneumatic rotary actuator (a hydraulic motor or an electric motor may be used) 26. A vertically movable base plate 27 is mounted on the rotary table 25 so as to be vertically movable within a predetermined vertical range by a plurality of guide shafts 29 vertically extending slidably through a guide cylinder 28 of the rotary table 25. It is hung.
The vertically movable base plate 27 is urged downward by a spring 30 on the outer circumference of the guide shaft 29.

A suction cup 31 for adsorbing the helmet 20 from the upper side by air suction is attached to the lower surface of the movable base plate 27, and a pair of helmet pressing bodies 32 are fixed on both sides of the suction cup 31. The lower side of the helmet pressing body 32 is a concave curved surface that fits with the outer peripheral surface of the helmet 20.

The curved surface finishing device of the first embodiment is used for the helmet 2
In order to finish the curved surface of the neck portion 20a of 0, as shown by the chain line in FIG.
1. With the helmet pressing body 32 facing upward, the outer peripheral surface of the helmet 20 is fitted into the helmet pressing body 32, and after the helmet 20 is sucked by the suction cup 31, the rotary table 25 is inverted as shown by the solid line in the figure. Let's face down.

After that, the lifting table 23 is lowered by the lifting hydraulic cylinder 22 to move the neck portion 20a of the helmet 20.
Is pressed against the surface of the grinding belt 2 on the mold 4,
When the neck portion 20a is ground by the grinding belt 2 by circulating the grinding belt 2, the neck portion 20a is molded according to the curved surface of the upper surface 4a of the molding die 4, that is, according to the designed molding curved surface. After the molding is completed, the turntable 25 is turned upside down again and the helmet 20 is removed.

Next, the curved surface finishing apparatus of the second embodiment shown in FIGS. 3 and 4 will be described. In this example, the grinding belt 2
One of the belt wheels 11 and 17 for circulating the belt is pressed by the tension hydraulic cylinder 15 to apply tension to the grinding belt 2. In addition, the lifting hydraulic cylinder 34 is installed on the installation table 33 installed at a predetermined height position, and
An L-shaped helmet support arm 35 and a helmet pressing body 36 are mounted on the erection table 33 so as to be vertically movable within predetermined vertical ranges.

The helmet support arm 35 is urged upward by a spring 37 wound around the two guide shafts 35a. The helmet pressing body 36 slidably penetrates a plurality of guide shafts 38 into a guide cylinder 39 of the erection table 33, and is lifted and lowered by a lifting hydraulic cylinder 34. The lower surface 36a of the helmet pressing body 36 is a concave surface that fits with the outer peripheral surface of the helmet 20.

With the curved surface finishing apparatus of the second embodiment, the helmet 2
In order to finish the curved surface of the neck portion 20a of 0, the helmet 20 is supported by the helmet support arm 35 through the viewing window 20b, and the helmet pressing body 36 is lowered by the hydraulic cylinder 34 for lifting and lowering the helmet 20 to the helmet support arm 35. Then, the neck portion 20a of the helmet 20 is pressed against the surface of the grinding belt 2 on the mold 4 in the same manner as above.

[0022]

According to the present invention, the grinding belt is circulated while sliding along the upper surface of the molding die, and the neck portion is pressed against the grinding belt on the molding die while holding the helmet to grind. Since the neck can be finished according to the designed and molded curved surface, the following effects are obtained.

Since the entire structure and the structure of each part can be remarkably simpler than the conventional one, it can be provided at a low cost. Since the curved surface can be finished with a simple movement, there are few troubles. It is possible to easily change the helmet size and the curved surface shape of the neck by simply changing the mold. Grinding with the neck of the helmet facing down prevents grinding dust from entering the helmet. It can be finished neatly without the need for refinishing.

[Brief description of drawings]

FIG. 1 is a partially omitted front view showing a curved surface finishing device according to a first embodiment of the present invention.

FIG. 2 is a side view in which a part of the same is shown in section.

FIG. 3 is a schematic front view of a second embodiment.

FIG. 4 is a schematic side view of the above.

[Explanation of symbols]

 2 Grinding belt 3 Belt circulation device 4 Mold 4a Upper surface of mold 7 Guide column (rail) 11/17 Belt wheel 15 Hydraulic cylinder for tension 20 Helmet 20a Neck 22 Hydraulic cylinder for lifting 23 Lifting table 25 Rotating table 31 Sucker 32 Helmet pressing body 33 Construction table 34 Hydraulic cylinder for lifting and lowering 35 Helmet support arm 36 Helmet pressing body 37 Spring

Claims (4)

[Claims] 1. A molding die having an upper surface curved to match the design molding curved surface of a helmet neck portion, a grinding belt circulated by a belt circulating device while sliding on the upper surface of the molding die, and a helmet for holding the same. A curved surface finishing device for a helmet neck portion, comprising a helmet pressing mechanism for pressing the neck portion against the grinding belt on the mold. 2. The helmet pressing mechanism comprises an ascending / descending fluid pressure cylinder, an ascending / descending platform that is vertically moved along the rail by the cylinder, a turntable mounted on the ascending / descending table so that it can be turned upside down, and an outer surface of the helmet. The curved surface finishing device for the helmet neck portion according to claim 1, comprising a suction cup held by the rotary table for adsorbing the helmet, and a helmet pressing body held by the rotary table for pressing the helmet from above. . 3. A helmet support arm, wherein the helmet pressing mechanism is urged upward by a spring so as to be vertically movable on a erection base, a lifting hydraulic cylinder attached to the erection base, The helmet neck portion according to claim 1, comprising a helmet pressing body that is mounted on the erection table so as to be lifted and lowered by a lifting hydraulic cylinder and that presses a helmet supported by the helmet support arm. Curved finishing device. 4. The helmet neck portion according to claim 1, wherein the belt circulating device includes a tension fluid pressure cylinder for pulling or pressing the belt wheel to apply tension to the grinding belt. Curved surface finishing device.