JP2003127010A - Grasping mechanism for columnar object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a grasping mechanism to apply to a columnar object of which the inapplicable large diametral flange in an usual way is formed by comprising an entirety of the grasping mechanism in order to make openably. SOLUTION: The grasping mechanism for the columnar object comprises a turnable basic plate arranged within the case body, three pieces of pivotal pins provided on this turnable basic plate, a sub-layer having the rear end thereof supported in a pivotal state with these pivotal pins, three pieces of main levers having each rear end thereof supported respectively in the pivotal state with ah anchor pin, the member for grasping a tip end on each tip end of this main lever supported turnably and in the pivotal state and the tip end of the above sub-lever coupled to the substantially intermediate position of the above main lever in the pivoted state. This grasping mechanism for the columnar object is characterized by dividing a case body and a turnable basic body into two pieces while avoiding the mounting position of an anchor pin, by mounting an openable axial pin in the divided end of one side in the case body, by mounting a locking member used to fix the case body divided into two pieces integrally near the divided end of the other side in the case body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a columnar object gripping mechanism, and more particularly to a columnar object having a large diameter to a columnar object having a small diameter, and a gripping operation thereof. The present invention relates to a gripping mechanism of a columnar object which is simple and reliable, and can surely perform centering, and has a perfect gripping effect, in which the gripping mechanism itself can be opened and closed. In addition,
The columnar article in this specification includes both a cylindrical body such as a circular pipe and a solid rod body having a circular cross section.

[0002]

2. Description of the Related Art Conventionally, in the field of a chuck of a lathe, a columnar holder in a pipe cutting machine, etc., a columnar object gripping mechanism has been used in various forms in order to stably retain a columnar object to be processed. Came.

[0003]

By the way, the gripping mechanism is provided with a tip gripping member which is in pressure contact with the columnar member and directly clamps and grips the columnar object. Since it was not possible to secure a large stroke width when the member appeared and disappeared, the applicable range of the diameter of the columnar object that could be dealt with was narrowed, and the gripping operation was complicated, and the gripping effect was not strong. There was a problem.

Further, conventionally, in order to deal with a columnar object having a large diameter dimension, a plurality of individually attachable attachments have been prepared, and an optimum attachment has been selected and attached. It took effort.

In order to solve such a problem, the applicant of the present invention has proposed the columnar object gripping mechanism of Japanese Patent Laid-Open No. 2001-225214. According to this Japanese Patent Laid-Open No. 2001-225214, it is possible to widely support the diameter of the columnar object, the gripping operation and the centering operation are easy, and the gripping effect can be improved.

By the way, when handling a columnar object having a flange at its end, the flange is caught in a through hole for inserting the gripping mechanism, so that the gripping mechanism cannot be applied as it is. Can be considered. INDUSTRIAL APPLICABILITY The present invention is configured such that the whole gripping mechanism is configured to be openable and closable, and the gripping mechanism can be easily opened and closed even for a columnar object having a large-diameter flange that cannot be normally applied. The present invention provides a gripping mechanism for a columnar object adapted to be applied to.

[0007]

As a means for solving the problems of the present invention, firstly, in the first aspect of the invention, a case body is constructed by a pair of frame plates having through holes through which columnar objects can be inserted. In the case body, there is a through hole through which a columnar member can be inserted, and a rotating board that is rotatable in the circumferential direction is arranged. The rotating board is divided into three equal parts in the circumferential direction. Three pivot pins are provided, the rear ends of the sub-lever rods are pivotally supported by the pivot pins, and the frame plates are divided into three equal parts in the circumferential direction. Three anchor pins are attached, and the rear ends of the three main lever rods are pivotally supported by the respective anchor pins, and the tips of the main lever rods work together as a whole. A tip gripping member that can clamp and grip a columnar object is pivotally supported in a rotatable manner, In a columnar object gripping mechanism in which the tip of the sub-lever rod is pivotally connected to a substantially intermediate position of the main lever rod, the case body and the rotating substrate are divided into two parts while avoiding the attachment position of the anchor pin, A columnar object gripping mechanism characterized in that an opening / closing shaft pin is attached to one side divided end of the body, and a lock member for integrally fixing the two divided case bodies is attached near the other divided end of the case body. Is.

According to a second aspect of the present invention, there is provided a columnar object gripping mechanism according to the first claim, wherein the tip end gripping member is pivotally supported in a two-sided supporting state.

According to a third aspect of the present invention, a pair of rollers whose tip gripping member is made of a flexible material and a disk set such that the blade portion is positioned slightly retracted from the outer surface of the rollers. The columnar object gripping mechanism according to claim 1 or 2, which is configured by a cylindrical cutter.

Next, the invention according to claim 4 is characterized in that an operation handle for rotating the rotating substrate is provided on the upper portion of the case body, and a ratchet mechanism portion for returning the rotating substrate to the original state is attached to the lower portion of the case body. A columnar object gripping mechanism according to any one of claims 1 to 3.

In the columnar object gripping mechanism according to the first aspect of the present invention, an organic link mechanism is adopted so that a large stroke width can be secured when the tip gripping member is retracted, so that the columnar object is gripped. In the gripping mechanism that simplifies the operation and centering operation and further enhances the gripping effect, even if the columnar object has a flange, a wide opening can be secured by opening the case body and the rotating substrate. The feature is that the columnar object can be reliably put in and taken out from the opening through the opening. After the columnar object is introduced, the opening that has been once opened is closed again, and then locked by the lock member so as not to inadvertently open.

Further, in the columnar object gripping mechanism according to the second aspect, since the tip end gripping member supports the shaft-like shape in a stable double-sided support state, it is compared with the conventional tip-end gripping member in the cantilevered support state. And the contact with the pillar becomes stable,
The contact pressure is increased, and as a result, the gripping effect is also perfect.

Further, the third aspect is characterized in that when the columnar object (workpiece) is a pipe, it can be used as a pipe cutter.

According to the fourth aspect of the present invention, the operation handle for rotating the rotating substrate is provided on the upper part of the case body, and the ratchet mechanism is attached to the lower part of the case body. Since the ratchet mechanism can easily return the rotary substrate to its original state, it is easy to handle.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a columnar object gripping mechanism of the present invention will be described in detail below, but the present invention is not limited thereto.

First, the present invention will be described with reference to FIGS. 1 to 8. FIG. 1 is a front perspective view of the holding mechanism with the case body closed, FIG. 2 is a front perspective view of the same with the case opened, and FIG. FIG. 4 is a front view of the rotating substrate, FIG. 4 is a vertical cross-sectional rear view showing the internal mechanism in a state where the case body is closed (a gripping state of a large-diameter columnar object), and FIG. ), FIG. 6 is FIG.
7 is a sectional view taken along the line AA in FIG. 7, FIG. 7 is a sectional view taken along the line BB, and FIG. 8 is a sectional view taken along the line CC.

According to the present invention, a pair of frame plates 1a and 1b are arranged in parallel, and an outer peripheral frame 2 is laid between the frame plates 1a and 1b to integrate the entire body to form a case body 3. Through holes 5a and 5b are formed in the plates 1a and 1b in the vicinity of their centers so that the columnar object 4 can be inserted therethrough.

The shapes of the frame plates 1a and 1b and the through holes 5
In general, the shapes of a and 5b are preferably disk-shaped as shown in the figure, but other shapes may of course be used. Further, the columnar object 4 is usually an elongated one having a cylindrical or solid rod-like circular cross section, but needless to say, it may be an elongated one having a polygonal cross section other than a circle.

Next, in the case body 3, a rotating substrate 6 is provided.
Are arranged so as to be rotatable within the case body 3. A through hole 6a through which the columnar object 4 can be inserted also in the rotating substrate 6
Are formed. The turning operation of the turning board 6 is performed by an appropriate means. For example, the operation handle 7 is attached to the upper part of the case body 3, the gear 8 is attached to the handle shaft 7a of the operation handle 7, and the gear 8 is turned. By engaging the male screw 6b on the peripheral wall of the base plate 6 and rotating the operating handle 7,
The peripheral wall male screw 6b is rotated via the handle shaft 7a and the gear 8, and as a result, the rotating substrate 6 is rotated. The rotation width (rotation angle) of the rotation substrate 6 is freely designed, but is regulated by adjusting the rotation angle of the operation handle 7 in the illustrated embodiment.

As a method of rotating the rotating substrate 6, in addition to the above-described form, a method of using a rack and pinion mechanism,
There is a method of using a worm gear, etc., and these methods have a feature that the operation handle 7 does not return unintentionally because the reverse rotation of the operation handle 7 does not occur.

Further, in the present invention, since the ratchet mechanism portion is attached near the lower portion of the case body 3, the state where the rotating substrate 6 is rotated by a certain angle cannot be returned backward. When the locking state between the locking claw 16 and the ratchet tooth portion 6c of the rotating substrate 6 is released, the rotating spring 6 is immediately returned to the state before starting the rotation by the action of the return spring 17. . Reference numeral 18 is a press-contact spring for pressing the locking claw 16 against the ratchet tooth 6c.

The basic structure of the gripping mechanism will now be described. The rotary board 6 is provided with three pivotal pins 9a, 9b, 9c at three circumferentially divided positions.
The pivot lever pins 9a, 9b, 9c are used for the sub-lever rod 10.
The rear ends of a, 10b and 10c are pivotally supported.

In order to form the pivot pin 9a, 9b, 9c at the inward position within the possible range on the rotary substrate 6, in the embodiment of FIG. Protruding bulges 15a, 15b, 15c were formed on the side. As a result, a wide space is secured inside the rotary substrate 6 except for the protruding bulges 15a, 15b, 15c, and the existence of the wide space ensures smooth operation of the other link mechanism without colliding with the rotary substrate 6. Therefore, a feature that a stroke width when the tip gripping member described later appears and disappears can be secured is created.

Further, the frame plates 1a, 1b are provided at positions where the circumferential direction of the pair of frame plates 1a, 1b is divided into three equal parts.
Three anchor pins 11a, 11b, 11c are attached to each b, and the anchor pins 11a, 11b
b, 11c, the three main lever rods 12a, 12
The rear ends of b and 12c are pivotally supported by the frame plates 1a and 1b.

On the other hand, the main lever rods 12a, 12b,
At each tip of 12c, tip gripping members 13a, 13b, 1
3c is rotatably and pivotally supported. The tip gripping members 13a, 13b, 13c are configured to cooperate with each other to clamp and grip the columnar object 4.

Further, the sub-lever rods 10a, 10b,
The tip of 10c is pivotally connected to the substantially intermediate position of the main lever rods 12a, 12b, 12c via shafts 14a, 14b, 14c.

According to the present mechanism having the above-described structure, first, the frame plates 1a and 1b and the through holes 5a of the rotary substrate 6,
The columnar object 4 is inserted through 5b and 6a. Here, when the flange 4a or the like is attached to the columnar object 4, first, the lock member 19 is released, and the case body 3 and the rotating substrate 6 are along the dividing line 21 with the opening / closing axis pin 20 as a fulcrum. 2 (see FIG. 2), the target columnar object 4 is guided to the through holes 5a, 5b, 6a through the widely opened introduction opening 22, and after introduction, the case body 3 and the rotating substrate are divided into two. 6 and 6 are returned to their original positions and both are locked and fixed by the lock member 19. By doing so, even the columnar object 4 having a large diameter can be reliably accommodated in the gripping mechanism of the present invention.

After the columnar object 4 is housed in the gripping mechanism in this way, when the operation handle 7 is rotated in the direction of the arrow in FIG.
It will rotate a predetermined amount inside. When the rotary substrate 6 rotates, the pivot pins 9a, 9 provided on the rotary substrate 6
b and 9c move, the sub-lever rods 10a, 10
b and 10c will be pulled in the same direction.

After the sub-lever rods 10a, 10b, 10c have been pulled in the directions described above, the shafts 14a, 14b, 1
The main lever rods 12a, 12b, 12c are pulled by the sub-lever rod via 4c. At this time, the rear ends of the main lever rods 12a, 12b, 12c are
Since it is pivotally supported by the frame plates 1a, 1b by the anchor pins 11a, 11b, 11c, it maintains a stationary state at that position.

As described above, the main lever rods 12a, 12
Since the rear ends of b and 12c are in an immovable state integrally with the case body 3 (however, since they are only pivotally supported, they are free to pivot), each main lever rod is With the anchor pins 11a, 11b, 11c as fulcrums, FIG.
The state moves to the state of FIG.

By moving the main lever rods 12a, 12b, 12c as described above, the three tip gripping members 13 pivotally supported on each tip of the main lever rod.
The state in which the a, 13b, and 13c move to tightly grip the columnar object 4 is secured.

The pivot pins 9a, 9b and 9c of the present invention are formed at positions that divide the circumferential direction of the rotary substrate into three equal parts, and the main lever rods 12a of the same size are provided at the tip thereof.
12b and 12c are attached, and the sub-lever rod 1
Since 0a, 10b, and 10c are also formed to have the same size, the three tip gripping members 13a, 13b, and 13c come into contact with the outer peripheral surface of the columnar object 4 at an equal pressure, and as a result, the columnar object 4 is formed. Accurate and automatic centering will be performed.

Further, the tip end holding members 13a, 13b, 13c
The gripping effect is excellent, and a strong gripping effect can be obtained.
It is also possible to achieve a more reliable gripping effect by improving the anti-slip effect by a method such as knurling the surface of the tip gripping member.

Subsequently, when the locking claw 16 shown in FIG. 5 is removed from the ratchet tooth 6c, the rotating base plate 6 returns to the current state by the action of the return spring 17, and therefore the sub lever rod and The main lever rod moves, and as a result, the tip gripping member can be released from the gripped state of the pillar 4.

Further, as shown in FIG. 6, the tip end holding member 1
If 3a and 13a are composed of rotating rollers and the left and right ends of the rotating rollers are supported in a bilaterally supported state in a pivoted manner, the stability of the gripping surface is improved as compared with the conventional cantilever-supported gripping mechanism. Especially excellent.

Further, in the gripping mechanism of the present invention, the rotating rollers 13a, 13a are rollers made of a flexible material such as urethane rubber, and the blade portion is located at a position slightly retracted from the outer surface of the rollers. When the disc-shaped cutter 23 is set in such a manner, when the tip gripping member 13a is gradually tightened and comes into contact with the columnar object 4, the blade portion 23a of the disc-shaped cutter 23 comes into contact with the columnar object in a centripetal manner. Therefore, it is possible to obtain a pipe cutter capable of performing a stable gripping work while centering.

In FIG. 4, the roller designated by the reference numeral 24 is a guide roller having a recess in the peripheral wall thereof, and in order to smoothly rotate the rotating substrate 6 without twisting it, the roller is provided in this recess. This is for accommodating the peripheral wall portion and ensuring stable rotation. Further, the roller numbered 25 is
This is a rotation position regulation roller for determining the position of the rotation substrate 6 when returning to the rotation.

[0038]

As described above, according to the columnar object gripping mechanism of the present invention, since the distal end gripping member employs the link mechanism capable of largely projecting and retracting in the through hole, it is possible to widely correspond to the diameter of the columnar object. Therefore, there is an excellent effect that the attachment and the like corresponding to each individual are not required, and the operation of gripping and centering the columnar object is simplified and the gripping effect is improved.

Further, according to the second aspect of the invention, since the tip end holding member is supported in a two-sided state in a shaft-mounted manner, the contact state with the columnar object is stable, and the holding effect is enhanced.

Furthermore, the invention according to claim 3 has an effect that it can be used as a pipe cutter when the columnar object is a pipe.

Further, in the invention according to claim 4, the operation handle for rotating the rotating substrate is provided on the upper part of the case body, and the ratchet mechanism is attached to the lower part of the case body. Since the ratchet mechanism can easily return the rotary substrate to its original state, it is easy to handle.

[Brief description of drawings]

FIG. 1 is a front perspective view of a gripping mechanism according to the present invention with a case body closed.

FIG. 2 is a front perspective view of the same opened state.

FIG. 3 is a front view of a rotating substrate of the gripping mechanism according to the present invention.

FIG. 4 is a vertical cross-sectional rear view (grip state of a large-diameter columnar object) showing the internal mechanism of the gripping mechanism according to the present invention with the case body closed.

FIG. 5 is a vertical cross-sectional rear view (grip state of a columnar object having a small diameter) showing the internal mechanism of the gripping mechanism according to the present invention with the case body closed.

6 is a cross-sectional view taken along the line AA in FIG.

7 is a cross-sectional view taken along the line BB in FIG.

FIG. 8 is a sectional view taken along line CC in FIG.

[Explanation of symbols]

1a, 1b ... Frame plate 2 ... Outer frame 3 ... Case body 4 ... Column 4a ... Flange of columnar object 5a, 5b ... Through holes in the frame plate 6 ... Rotating substrate 6a ... Through hole of rotating substrate 6b ... Male screw on the peripheral wall of the rotating substrate 6c ... Ratchet tooth 7 ... Operation handle 7a ... Operation handle shaft 8 ... Gear of operation handle 9a, 9b, 9c ... Pivoting pin 10a, 10b, 10c ... Sub lever rod 11a, 11b, 11c ... Anchor pin 12a, 12b, 12c ... Main lever rod 13a, 13b, 13c ... Tip gripping member 14a, 14b, 14c ... Shaft 15a, 15b, 15c ... Projection bulge 16 ... Locking claw 17 ... Return spring 18 ... Pressure contact spring 19 ... Lock member 20 ... Open / close axis pin 21… 2 dividing line 22 ... Introduction opening 23 ... Disk-shaped cutter 23a ... Blade portion of disk-shaped cutter 24 ... Guide roller 25 ... Rotation position regulation roller

Claims (4)

[Claims] 1. A case body is constituted by a pair of frame plates having a through hole through which a columnar object can be inserted. Inside the case body, there is a through hole through which the columnar object can be inserted, and the case body can be rotated in a circumferential direction. A rotary board is provided, and three pivot pins are provided at positions where the circumferential direction of the rotary board is divided into three equal parts.
The rear end of the sub-lever rod is pivotally supported by this pivotal pin, and three anchor pins are attached to each frame plate at positions where the circumferential direction of the pair of frame plates is divided into three equal parts. Each anchor pin pivotally supports the rear end of each of the three main lever rods, and the tip of this main lever rod cooperates as a whole to grasp the columnar object by pinching and grasping it. In a columnar object gripping mechanism in which a member is pivotally supported rotatably and the tip end of the sub-lever rod is pivotally connected to a substantially intermediate position of the main lever rod, avoiding the anchor pin attachment position. A lock member that divides the case body and the rotating substrate into two parts, attaches an opening / closing axis pin to one side divided end of the case body, and integrally fixes the two divided case bodies near the other divided end of the case body. Columnar object gripping mechanism characterized by attaching 2. The columnar object gripping mechanism according to claim 1, wherein the tip gripping member is pivotally supported in a both-supported state. 3. The tip gripping member is composed of a pair of rollers made of a flexible material, and a disc-shaped cutter set so that the blade portion is located at a position slightly retracted from the outer surface of the rollers. The columnar object gripping mechanism according to claim 1. 4. The operation handle for rotating the rotating substrate is provided on the upper part of the case body, and the ratchet mechanism portion for returning the rotating substrate to the original state is attached to the lower part of the case body. The columnar object gripping mechanism according to claim 1.