JP5404105B2 - Clamp mechanism, spanner and tool clamper provided with this clamp mechanism - Google Patents

Description

  The present invention relates to tools for a tightening operation such as a spanner and a tool clamper, and more particularly to a clamp mechanism for gripping an object to be tightened.

  An object of the tightening operation, specifically, a bolt, a nut, a tool holder, and the like are configured so as to be able to rotate in the tightening or loosening direction. The tightening or loosening operation of these objects is performed by gripping the outer periphery of the object with the tip of the spanner and rotating the handle of the spanner in the tightening or loosening direction.

  As such a spanner, for example, the one described in Japanese Patent Application Laid-Open No. 2004-042156 (Patent Document 1) is known. In the spanner described in Patent Document 1, the roller-shaped wedge member rolls in the wedge region and the play region in the wedge guide groove formed on the inner peripheral surface of the ring portion. Thereby, in the wedge region, the roller-shaped wedge member bites between the wall surface of the wedge guide groove and the outer peripheral surface of the object, and grips the object by the wedge action. In the play area, the wedge action is canceled and the spanner can be removed from the object.

  Further, as a tool clamper for holding a tool holder so as not to rotate when a cutting tool such as a drill or an end mill is chucked or unchucked to the tool holder, JP 2004-058164 A (Patent Document) Those described in 2) are known. The tool clamper described in Patent Document 2 is also used as a vise and grips the outer periphery of the tool holder, and its basic configuration is common to the spanner described in Patent Document 1.

These spanner and tools clamper is possible to easily position the roller-shaped wedge member in the wedge area or Bi Aso area by the operation of the switching lever, the switching operation between the gripping state and removal state of the object It is easy and the working efficiency can be greatly improved.

JP 2004-042156 A JP 2004-058164 A

  By the way, in order to secure the function as a roller, the roller-shaped wedge member is usually subjected to various surface treatments so that its rolling surface is smooth. Generally, the rolling surface of the roller-shaped wedge member is polished so that the friction coefficient of the rolling surface becomes small.

  For this reason, the spanner and tool clamper described above still have points to be improved. That is, since the rolling surface is smooth, there is a possibility that the roller-shaped wedge member may idle when rolling from the play area to the wedge area, and it may take time to exhibit the wedge action. If it does so, it cannot change rapidly from the removal state of a target object to a grasping state.

  In view of the above circumstances, an object of the present invention is to provide a clamp mechanism that can quickly and reliably switch from a removed state of an object to a gripped state.

Clamping mechanism according to the invention for this purpose is a clamping mechanism for detachably gripping the outer circumferential surface of the object a cylindrical, a plurality of long holes are formed at intervals in the circumferential direction, a columnar shape A cylindrical retainer surrounding the outer peripheral surface of the object, a ring portion formed at one end of the handle portion and the handle portion, and the ring portion has a plurality of wedge guide grooves extending in the circumferential direction on the inner peripheral surface. It is formed with a gap in the circumferential direction, and has a clamp mechanism main body that accommodates the retainer on the inner peripheral side, and a diameter larger than the thickness of the retainer, and each is accommodated in a long hole, and the retainer can be rotated. Along with this, a plurality of roller rollers that move in the circumferential direction in the wedge guide groove and are located in either the wedge region or the play region in the wedge guide groove are provided. These roller-shaped rollers roll in between the wall surface of the wedge guide groove and the outer peripheral surface of the cylindrical object in the wedge region as the ring rotates, and the wall surface of the wedge guide groove and the cylindrical shape The outer peripheral surface of the cylindrical object is gripped by the wedge action sandwiched between the outer peripheral surface of the object and the wedge action is canceled in the play area. The rolling surfaces of the plurality of roller-shaped rollers are subjected to surface treatment for increasing the friction coefficient.

  According to the present invention, since the rolling surface of the roller has been subjected to a surface treatment for increasing the coefficient of friction, the roller can easily bite between the wall surface of the wedge guide groove and the outer peripheral surface of the object in the wedge region. The wedge action can be exhibited quickly.

  The present invention advantageously holds the outer peripheral surface of an object when the object such as a tool holder is cylindrical or columnar, but other objects such as a round hole formed at the center of a bolt or nut. Can also be advantageously gripped.

In other words, the clamping mechanism according to the present invention is a clamping mechanism for detachably holding a round hole of a cylindrical object, wherein a plurality of long holes are formed at intervals in the circumferential direction, and the outer peripheral surface is round. A cylindrical retainer facing the inner peripheral surface of the hole, a handle portion, and a columnar portion formed at one end of the handle portion, and the columnar portion includes a plurality of wedge guide grooves extending in the circumferential direction on the outer peripheral surface. The clamp mechanism main body is formed with a space between the retainer and the retainer, and the retainer has a diameter larger than the thickness of the retainer. A plurality of roller-shaped rollers that move in the circumferential direction and are located in either the wedge region or the play region in the wedge guide groove. The plurality of roller-shaped rollers roll in between the wall surface of the wedge guide groove and the inner peripheral surface of the cylindrical object in the wedge region as the cylindrical portion rotates, and the wall surface of the wedge guide groove and the cylinder grips the inner circumferential surface of the object a cylindrical by the wedge action sandwiched between the inner peripheral surface of the object shape, in the play area, to release the wedging action. The rolling surfaces of the plurality of roller-shaped rollers are subjected to surface treatment for increasing the friction coefficient.

  According to the present invention, since the rolling surface of the roller is subjected to the surface treatment for increasing the friction coefficient, the friction coefficient of the rolling surface is increased. Therefore, the roller can easily bite between the wall surface of the wedge guide groove in the wedge region and the outer peripheral surface of the object, and the wedge action can be exhibited quickly.

  Although the surface treatment of the rolling surface is not limited to one embodiment, as an example, the surface treatment is a blasting process in which particles collide with the rolling surface. As this blasting process, sand blasting, air blasting, shot blasting, blower blasting and the like can be applied. According to this embodiment, since the surface roughness of the rolling surface of the roller is increased, the friction coefficient of the rolling surface is increased.

  As another example of the surface treatment of the rolling surface, the surface treatment is a plating treatment. According to this embodiment, since the metal film is formed on the rolling surface of the roller by plating, the friction coefficient of the roller rolling surface is increased.

  The plating process is not limited to one embodiment, but as an example, the plating process is a hard chrome plating process. According to this embodiment, the film containing chromium is formed on the rolling surface of the roller, and the friction coefficient of the roller rolling surface can be increased. In addition, an annular cured film is formed along the entire circumference of the roller, and the roller can bite greatly between the wall surface of the wedge guide groove and the outer peripheral surface of the object, thereby further increasing the gripping force. it can.

  Preferably, the play area is connected to the wedge area on one side and the other side in the circumferential direction of the ring part or the cylindrical part, respectively. According to this embodiment, the object can be gripped by the wedge action both when the object is tightened in one circumferential direction and when the object is loosened in the other circumferential direction.

  Preferably, a switching lever is swingably attached to the handle, and the switching lever rotates the retainer with its free end engaged with the retainer. According to this embodiment, the wedge action can be easily released. Further, it is possible to easily switch from the tightening operation to the loosening operation or vice versa.

  Moreover, the spanner of this invention is provided with the clamp mechanism mentioned above and the handle part extended from the other end of a handle | pattern part. According to this embodiment, it is possible to provide a spanner that is advantageous for the tightening operation and the loosening operation.

  Moreover, the tool clamper of this invention is provided with the clamp mechanism mentioned above and the base part couple | bonded with a handle | pattern part. According to such an embodiment, a tool clamper advantageous for chucking and unchucking of a cutting tool can be provided.

  Thus, the present invention is completely different from the conventional roller having a smooth rolling surface. That is, the rolling surface of the roller of the present invention is subjected to a surface treatment to increase the friction coefficient and the friction coefficient is increased, so that the roller bites between the wedge guide groove surface in the wedge region and the outer peripheral surface of the object. It becomes easy and a wedge effect can be exhibited quickly. Therefore, it is possible to quickly and reliably switch from the object removal state to the gripping state. As a result, the efficiency of the clamping work is improved.

It is a top view which shows the spanner which becomes one Example of this invention. It is a disassembled perspective view of the Example shown in FIG. FIG. 3 is a side view showing a partial cross-section at III-III in FIG. 1. It is an expanded sectional view which shows the positional relationship of the roller and retainer of the spanner which becomes one Example of this invention. It is an expanded sectional view for operation | movement explanation which shows the positional relationship of the roller of the spanner which becomes one Example of this invention, and a wedge guide groove, (A) shows the state by which the wedge effect | action was cancelled | released, (B) and ( C) shows a state in which the wedge action is exerted. It is a perspective view which shows the spanner which becomes the other Example of this invention. It is a disassembled perspective view of the spanner which becomes another Example of this invention. It is a longitudinal cross-sectional view of the spanner which becomes another Example of this invention. It is an expanded sectional view for operation | movement explanation which shows the positional relationship of the roller of the spanner and wedge wedge groove | channel which become another Example of this invention, (A) shows the state by which the wedge effect | action was cancelled | released, (B) and (C) shows a state in which the wedge action is exhibited. It is a top view which shows the tool clamper which becomes further another Example of this invention. It is a disassembled perspective view which shows the tool clamper which becomes further another Example of this invention. It is a side view shown by making a partial cross section by XII-XII of FIG. It is explanatory drawing which expands and shows the tool clamper shown in FIG. It is an expanded sectional view for operation | movement explanation which shows the positional relationship of the roller of a tool clamper which becomes further another Example of this invention, and a wedge guide groove, (A) shows the state by which the wedge effect | action was cancelled | released, (B ) And (C) show a state in which a wedge action is exerted. It is sectional drawing which shows the roller of each Example of this invention.

  Hereinafter, embodiments of the present invention will be described in detail based on examples shown in the drawings. FIG. 1 is a plan view showing a spanner according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of a spanner according to one embodiment of the present invention. FIG. 3 is a side view showing a partial cross section taken along line III-III in FIG. FIG. 4 is an enlarged view showing a positional relationship between the retainer and the roller, in which the retainer of the spanner according to one embodiment of the present invention has a cross section in a plane including the central axis. FIG. 5 is an enlarged cross-sectional view for explaining the operation of the spanner retainer and the ring portion according to one embodiment of the present invention, with the cross section taken along a plane perpendicular to the central axis, and the positional relationship between the roller and the wedge guide groove. A) shows a state where the wedge action is released, and (B) and (C) show a state where the wedge action is exhibited.

  The spanner 10 shown in FIGS. 1 to 3 is provided with a handle portion extending in the longitudinal direction and a distal end of the handle portion, and detachably grips the outer peripheral surface of the object 2 such as a tightening tube of a tool holder, for example. A clamping mechanism. Specifically, a wrench main body 11, a roller 12 of a clamp mechanism provided at the tip of the wrench main body 11, a retainer 13, a wedge guide groove 14, and a switching means 15 are provided.

  The spanner body 11 includes a handle portion 112 extending in the longitudinal direction as a handle portion, and a ring portion 111 of a clamp mechanism formed at one end of the handle portion.

  The roller 12 bites between the inner peripheral surface of the ring part 111 and the outer peripheral surface of the object 2 when the object 2 is tightened or loosened through the object 2 in the center hole of the ring part 111 of the spanner body 11, The object 2 is gripped by a wedge action and has a roller shape.

  FIG. 15 is a sectional view showing the roller 12. The rolling surface of the roller 12 is subjected to a surface treatment for increasing the friction coefficient. Specifically, after the rolling surface of the roller 12 is made into a perfect circle by, for example, polishing, a cured film 12s is formed by plating. The cured film 12s is formed over the entire circumference of the roller 12. Examples of the plating treatment include hard chrome plating or hard nickel plating. The rolling surface of the roller 12 on which the cured film 12s is formed has a friction coefficient larger than that of a normal roller provided in a plurality on the bearing.

  Although not shown in the drawing, surface treatment other than plating treatment may be applied to the rolling surface of the roller 12, for example, sand blast, air blast, shot blast, blower blast, etc. You may apply the blasting which collides with the rolling surface of the roller 12 at high speed. As a result, the surface roughness of the rolling surface of the roller 12 can be increased, and the friction coefficient of the rolling surface can be increased.

  The retainer 13 is for holding the roller 12 at equal intervals along the inner peripheral surface of the ring portion 111, and is provided to be rotatable around the inner periphery of the ring portion 111 on the inner diameter side of the ring portion 111. Reference numeral 17 denotes a ring-shaped lid member for holding the retainer 13 including the roller 12 so as not to drop off from the ring portion 111. The lid member 17 is attached to a stepped portion 111 a provided at an edge portion on one end side of the ring portion 111. It is fitted and fixed to the ring portion 111 by a set screw 18.

  More specifically, as shown in FIGS. 1 to 3, the retainer 13 has a cylindrical shape with a diameter corresponding to the inner periphery of the ring portion 111, and the thickness of the retainer 13 is smaller than the diameter of the roller 12. Has been. Further, the retainer 13 accommodates the roller 12, and an elongated hole 131 parallel to the axis of the retainer 13 is divided into 12 portions at an appropriate interval in the circumferential direction of the retainer 13, for example, at an interval of 30 degrees. As shown in FIGS. 4 and 5, the roller 12 is held so as to be able to rotate around its axis, and is provided at both ends of the long hole 131. Are formed with locking grooves 132 that prevent the small diameter boss portions 121 provided at both ends of the roller 12 from being freely slidable to prevent the roller 12 from falling off to the inner peripheral side of the retainer 13. Further, an engaging portion 133 to which the switching means 15 is connected is formed at the remaining one portion of the above-mentioned 12 divided portions.

  The wedge guide groove 14 is for holding the roller 12 in a free state with the outer peripheral surface of the object 2 and holding the roller 12 in a state of biting between the outer peripheral surface of the object 2. The guide grooves 14 are formed on the inner peripheral surface of the ring portion 111 along the circumferential direction of the ring portion 111 so as to correspond to the arrangement interval of the rollers 12.

  Specifically, as shown in FIG. 5, the wedge guide groove 14 has a play area 141 that holds the roller 12 in a free state with the outer peripheral surface of the object 2, and a play area 141 that is centered on the play area 141. Left and right wedge regions 142 and 143 are provided to extend on both sides in the circumferential direction of the ring portion 111 in the region 141 and hold the roller 12 in a state of biting between the outer peripheral surface of the object 2.

  The switching means 15 operates the retainer 13 so that the roller 12 can be switched to a position opposite to the play area 141 of the wedge guide groove 14 and one of the left and right wedge areas 142 and 143.

  As shown in FIGS. 1 to 3, the switching means 15 includes a switching lever 152 that is provided at a location connected to the ring portion 111 of the handle portion 112 so as to be swingable in the horizontal direction by a pin 151. One end 152a of 152 passes through the ring portion 111 and engages with an engaging portion 133 provided in the retainer 13. A positioning mechanism for positioning the retainer 13 at a position where the roller 12 faces the play area 141 and a position where the roller 12 faces the left and right wedge areas 142 and 143 are provided at the other end 152b of the switching lever 152, respectively. 16 is provided.

  As shown in FIGS. 2 and 3, the positioning mechanism 16 is provided at the other end portion 152 b of the switching lever 152 facing the handle portion 112 of the spanner main body 11, so that the steel ball 162 is movably mounted in the blind hole 161. A spring member 163 that is inserted into the blind hole 161 and biases the steel ball 162 in a direction in which the steel ball 162 is pressed against the handle portion 112, and the retainer 13 at a position where the roller 12 opposes the play area 141 and the roller 12 Three engagement holes 164a to 164c that are provided at predetermined intervals on the surface of the handle portion 112 so that the steel ball 162 is engaged and disengaged so that the wedge regions 142 and 143 can be positioned opposite to each other. It is comprised from the click stop mechanism which consists of.

  Of the engagement holes 164a to 164c, the engagement hole 164a positions the retainer 13 at the neutral position N so that the roller 12 faces the play area 141, and the engagement hole 164b has the roller 12 on the left side. The retainer 13 is positioned at the tightening position L so as to face the wedge area 142, and the engagement hole 164c loosens the retainer 13 so that the roller 12 faces the right wedge area 143. It is for positioning.

  Next, operation | movement of the spanner 10 comprised in this way is demonstrated.

  When the object 2 is tightened, first, the switching lever 152 of the switching unit 15 is rotated to the neutral position N, and the steel ball 162 of the positioning mechanism 16 is engaged with the engagement hole 164a. In this state, as shown in FIG. 5A, each roller 12 held by the retainer 13 is opposed to the play area 141 of the wedge guide groove 14, so that it is in a free state.

  Next, after passing the object 2 through the ring portion 111 of the spanner body 11 in such a state, the switching lever 152 of the switching means 15 is rotated to the tightening position L shown in FIG. Accordingly, each roller 12 held by the retainer 13 is opposed to the wedge region 142 on the left side of the wedge guide groove 14, so that the spanner body 11 is moved in the direction of arrow A (clockwise direction) in FIG. When rotated, each roller 12 bites between the wall surface of the left wedge region 142 and the outer peripheral surface of the object 2. By this wedge action, the ring portion 111 of the spanner body 11 and the object 2 are integrated, and the outer peripheral surface of the object 2 is gripped by the tip of the spanner 10. Therefore, if the spanner 10 is rotated in the direction of arrow A, the object 2 can be tightened.

  When switching from the neutral position N shown in FIG. 5 (A) to the fastening position L shown in FIG. 5 (B) and starting the fastening operation of the object 2, the roller 12 has a large friction coefficient on the rolling surface. 12 rolls without idling and bites in with certainty, and the wedge action is quickly exhibited.

  In addition, since an annular cured film is formed along the entire circumference of the rolling surface of the roller 12, the roller 12 greatly increases between the wall surface of the wedge region 142 and the outer peripheral surface of the object 2 during the tightening operation. The biting force and the gripping force can be further increased.

  When the spanner 10 is removed from the object 2 after the tightening of the object 2 is completed, the wedge region 142 of the roller 12 is slightly rotated by rotating the spanner body 11 slightly in the direction opposite to the arrow A in FIG. The biting into the outer wall surface of the wall surface and the object 2 may be canceled. Thereby, the wedge action is released and the spanner 10 can be easily removed from the object 2.

  The object 2 of the spanner 10 can be obtained by rotating the switching lever 152 of the switching means 15 to the neutral position N after releasing the biting into the wall surface of the wedge region 142 of the roller 12 and the outer peripheral surface of the object 2. Removal from the unit becomes even easier.

  On the other hand, when the object 2 is loosened, the switching lever 152 of the switching means 15 is rotated to the neutral position N to engage the steel ball 162 of the positioning mechanism 16 in the same manner as when the object 2 is tightened. The rollers 12 held in the retainer 13 are engaged with the mating holes 164a and are opposed to the play area 141 of the wedge guide groove 14 to be in a free state.

  Next, after passing the ring portion 111 of the spanner body 11 in such a state through the object 2, the switching lever 152 of the switching means 15 is rotated to the loosening position UL shown in FIG. Accordingly, each roller 12 held by the retainer 13 is opposed to the wedge region 143 on the right side of the wedge guide groove 14, so that the spanner body 11 is moved in the direction of arrow B (counterclockwise direction) in FIG. Each roller 12 bites between the wall surface of the right wedge region 143 and the outer peripheral surface of the object 2, the ring portion 111 of the spanner body 11 and the object 2 are integrated, and the object 2 Is held by the tip of the spanner 10. Therefore, if the spanner 10 is rotated in the direction of arrow B, the object 2 can be loosened.

  When switching from the neutral position N shown in FIG. 5 (A) to the loosening position UL shown in FIG. 5 (C) and starting the loosening operation of the object 2, the roller 12 has a large friction coefficient on the rolling surface. 12 rolls without idling and bites in with certainty, and the wedge action is quickly exhibited.

  Further, since an annular cured film is formed along the entire circumference on the rolling surface of the roller 12, the roller 12 is greatly increased between the wall surface of the wedge region 143 and the outer peripheral surface of the object 2 during the loosening operation. The biting force and the gripping force can be further increased.

  When the spanner 10 is removed from the object 2 after the loosening operation of the object 2 is completed, the wedge area of the roller 12 is obtained by slightly rotating the spanner body 11 in the direction opposite to the arrow B in FIG. The biting into the wall surface 143 and the outer peripheral surface of the object 2 may be canceled. Thereby, the spanner 10 can be easily removed from the target object 2.

  The object 2 of the spanner 10 can be obtained by rotating the switching lever 152 of the switching means 15 to the neutral position N after releasing the biting into the wall surface of the wedge region 143 of the roller 12 and the outer peripheral surface of the object 2. Removal from the unit becomes even easier.

  According to the spanner 10 of this embodiment, the clamp mechanism for detachably gripping the outer peripheral surface of the object 2, wherein a plurality of long holes 131 are formed at intervals in the circumferential direction. A cylindrical retainer 13 surrounding the outer peripheral surface of the object 2, a handle portion 112 as a handle portion, and a ring portion 111 formed at one end of the handle portion 112, and the ring portion 111 has a plurality of inner peripheral surfaces. The wedge guide grooves 14 are formed at intervals in the circumferential direction, and have a spanner body 11 as a clamp mechanism body that accommodates the retainer 13 on the inner peripheral side, a diameter larger than the thickness of the retainer 13, and a long length. Respectively housed in the holes 131, roll along the wedge regions 142 and 143 and the play region 141 in the wedge guide groove 14 according to the rotation of the retainer 13, and the object 2 in the wedge regions 142 and 143. The outer peripheral surface held by a wedge action, comprising a plurality of rollers 12 to release the play area 141 Dekusabi action.

  Since the rolling surface of the roller 12 is subjected to surface treatment for increasing the friction coefficient, the friction coefficient of the roller rolling surface is increased. Therefore, the roller 12 can easily bite between the wall surface of the wedge guide groove 14 and the outer peripheral surface of the object 2 in the wedge regions 142 and 143, so that the wedge action can be exhibited quickly.

  Further, according to the spanner 10 of the present embodiment, the rolling surface of the roller 12 is subjected to hard chrome plating as a surface treatment for increasing the coefficient of friction, so that an annular cured film is formed along the entire circumference of the roller 12. In addition, the roller 12 can greatly bite between the wall surface of the wedge guide groove 14 and the outer peripheral surface of the object 2, and the gripping force can be further increased.

  Further, according to the spanner 10 of the present embodiment, the play area 141 is connected to the wedge areas 142 and 143 on the one side and the other side in the circumferential direction of the ring portion 111, so that the tightening operation is loosened or vice versa. It becomes possible to switch easily. Therefore, the efficiency of the clamping operation is further improved.

  Further, according to the spanner 10 of the present embodiment, the switching lever 152 is swingably attached to the handle portion 112, and the switching lever 152 rotates the retainer 13 with its free end engaged with the retainer 13. The switching operation between the tightening operation and the loosening operation can be performed easily and reliably.

  Next, another embodiment of the present invention will be described. FIG. 6 is a perspective view showing a spanner according to another embodiment. FIG. 7 is an exploded perspective view showing a spanner according to another embodiment. FIG. 8 is a longitudinal sectional view showing a spanner according to another embodiment. FIG. 9 is an enlarged cross-sectional view for explaining an operation, showing a cross section of a retainer and a ring portion of a spanner according to another embodiment of the present invention and an object in a plane perpendicular to the central axis, and showing a positional relationship between the roller and the wedge guide groove. It is a figure, (A) shows the state by which the wedge effect | action was cancelled | released, (B) and (C) show the state which exhibited the wedge effect | action.

  The spanner 20 shown in FIGS. 6 to 8 is provided in a handle portion extending in the longitudinal direction and a round hole 2Aa of an object 2A such as a bolt having a cylindrical head portion provided at the tip of the handle portion. A clamping mechanism for detachably holding the peripheral surface. Specifically, a wrench main body 21, a roller 22 of a clamp mechanism provided at the tip of the wrench main body 21, a retainer 23, a wedge guide groove 24, and a switching means 25 are provided.

  The spanner body 21 includes a handle portion 211, a columnar base portion 212 provided at one end of the handle portion 211, and a columnar portion 213 having a diameter smaller than the diameter of the base portion 212 provided concentrically at one end surface of the base portion 212. It consists of. In addition, a fitting portion 214 that rotatably supports one end of the retainer 23 is formed at the step portion between the cylindrical portion 213 and the base portion 212.

  As shown in FIGS. 6 to 9, the roller 22 is provided between the outer peripheral surface of the cylindrical portion 213 and the inner peripheral surface of the round hole 2Aa of the target object 2A when the target object 2A is tightened or loosened by the spanner body 21. It bites in and grips the object 2A by a wedge action, and has a roller shape.

  FIG. 15 is a sectional view showing the roller 22. The rolling surface of the roller 22 is subjected to a surface treatment for increasing the friction coefficient. Specifically, after the rolling surface of the roller 22 is made into a perfect circle by, for example, polishing, a cured film 22s is formed by plating. The cured film 22s is formed over the entire circumference of the roller 22. Examples of the plating treatment include hard chrome plating or hard nickel plating. The rolling surface of the roller 22 on which the cured film 22s is formed has a coefficient of friction larger than that of a normal roller provided in a plurality on the bearing.

  The retainer 23 is for holding the roller 22 at regular intervals along the outer peripheral surface of the cylindrical portion 213. As shown in FIGS. 7 and 8, the retainer 23 has an inner diameter corresponding to the outer periphery of the cylindrical portion 213 and is a target. The cylindrical shape has an outer diameter corresponding to the inner diameter of the round hole 2Aa of the object 2A, and the thickness of the retainer 23 is smaller than the diameter of the roller 22. At both ends of the retainer 23, annular support portions 23a and 23b for supporting the retainer 23 so as to be rotatable around the outer periphery of the cylindrical portion 213 are formed.

  Such a retainer 23 is fitted to the outer periphery of the cylindrical portion 213, one annular support portion 23 a is fitted to the fitting portion 214 of the base portion 212, and the lower end of the cylindrical portion 213 ( The other annular support portion 23b is fitted to a cap-like support member 28 fixed with a fixing screw 27 in FIG. 7), and is supported rotatably around the outer periphery of the cylindrical portion 213.

  As shown in FIGS. 7 and 9, the retainer 23 has long holes 231 that accommodate the respective rollers 22 and are parallel to the axis of the retainer 23 at an appropriate interval in the circumferential direction of the retainer 23, for example, 30 degrees. 11 are formed at 12 intervals, and the long holes 231 hold the rollers 22 so that they can rotate about their axes. Each roller 22 has a support structure that does not fall off from the outer peripheral side of the retainer 23, contrary to the spanner 10 described above. Further, an engaging portion 233 to which the switching means 25 is connected is formed at the remaining one portion of the above-mentioned twelve equally divided portions.

  The wedge guide groove 24 holds the roller 22 in a free state with respect to the inner peripheral surface of the round hole 2Aa of the object 2A and bites the roller 22 between the inner peripheral surface of the round hole 2Aa of the object 2A. The wedge guide groove 24 is formed on the outer peripheral surface of the cylindrical portion 213 corresponding to the arrangement interval of the rollers 22 along the circumferential direction of the cylindrical portion 213.

  Further, as shown in FIG. 9, the wedge guide groove 24 is configured to hold the roller 22 in a free state between the roller 22 and the inner peripheral surface of the round hole 2 </ b> Aa formed in the cylindrical head of the object 2 </ b> A. Centering on the play area 241 and the both sides of the cylindrical part 213 of the play area 241 in the circumferential direction, the roller 22 is provided between the inner peripheral surface of the round hole 2Aa of the object 2A. Left and right wedge regions 242 and 243 are held in the biting state.

  The switching means 25 operates the retainer 23 so that the roller 22 is switched to a position opposite to either the play area 241 of the wedge guide groove 24 or the left and right wedge areas 242, 243.

  As shown in FIGS. 6 to 8, the switching means 25 includes a switching lever 252 provided at a position where the handle portion 211 and the base portion 212 are connected so as to be swingable in the horizontal direction by a pin 251. One end 252a of 252 is engaged with an engaging portion 233 provided on the retainer 23. The other end portion 252b of the switching lever 252 is a positioning mechanism for positioning the retainer 23 at a position where the roller 22 faces the play area 241 and a position where the roller 22 faces the left and right wedge areas 242, 243, respectively. 26 is provided.

  As shown in FIGS. 6 and 8, the positioning mechanism 26 is provided at the other end 252 b of the switching lever 252 facing the handle portion 211 of the spanner main body 21, so that the steel ball 262 is movably mounted in the blind hole 261. A spring member 263 that is inserted into the blind hole 261 and urges the steel ball 262 in a direction in which the steel ball 262 is pressed against the handle portion 211, and a position where the roller 22 faces the play area 241 and the roller 22 Three engagement holes 264a to 264c that are provided at predetermined intervals on the surface of the handle portion 211 so that the steel ball 262 is engaged and disengaged so that the wedge regions 242 and 243 can be positioned opposite to each other. It is comprised from the click stop mechanism which consists of.

  Of the engagement holes 264a to 264c, the engagement hole 264a positions the retainer 23 at the neutral position N so that the roller 22 faces the play area 241. The engagement hole 264b includes the roller 22 on the left side. The retainer 23 is positioned at the tightening position L so as to face the wedge region 242, and the engagement hole 264c loosens the retainer 23 to the position UL so that the roller 22 faces the right wedge region 243. It is for positioning.

  Next, operation | movement of the spanner 20 comprised in this way is demonstrated.

  When tightening the object 2A, first, as shown in FIG. 9A, the switching lever 252 of the switching means 25 is turned to the neutral position N, and the steel ball 262 of the positioning mechanism 26 is engaged with the engagement hole 264a. Engage with. In this state, each roller 22 held by the retainer 23 is opposed to the play area 241 of the wedge guide groove 24, so that it is in a free state.

  Next, after engaging the cylindrical portion 213 of the spanner main body 21 in this state with the circular hole 2Aa of the object 2A together with the retainer 23, the switching lever 252 of the switching means 25 is rotated to the tightening position L shown in FIG. Operation. Accordingly, each roller 22 held by the retainer 23 is opposed to the wedge region 242 on the left side of the wedge guide groove 24, so that the spanner body 21 is moved in the direction of arrow A (clockwise direction) in FIG. When rotated, each roller 22 bites between the wall surface of the left wedge region 242 and the inner peripheral surface of the round hole 2Aa of the object 2A. Thereby, the cylindrical part 213 of the spanner main body 21 and the target object 2A are integrated, and are hold | gripped by the front-end | tip of the target object 2A spanner 20. FIG. Therefore, if the spanner 20 is rotated in the direction of arrow A, the object 2A can be tightened.

  When switching from the neutral position N shown in FIG. 9A to the fastening position L shown in FIG. 9B and starting the fastening operation of the object 2A, the friction coefficient of the rolling surface of the roller 22 is large. The roller 22 rolls without idling and securely bites into it, so that the wedge action is quickly exhibited.

  Further, since an annular cured film is formed along the entire circumference of the rolling surface of the roller 22, the roller 22 is interposed between the wall surface of the wedge region 242 and the inner peripheral surface of the object 2A during the tightening operation. The biting force can be greatly increased, and the gripping force can be further increased.

  When the spanner 20 is removed from the object 2A after the tightening of the object 2A is completed, the wedge region 242 of the roller 22 is rotated by slightly rotating the spanner body 21 in the direction opposite to the arrow A in FIG. 9B. The biting into the inner peripheral surface of the wall surface and the object 2A may be canceled. Thereby, the wedge action is released and the spanner 20 can be easily removed from the object 2A.

  In addition, after releasing the biting into the wall surface of the wedge region 242 of the roller 22 and the inner peripheral surface of the round hole 2Aa of the object 2A, if the switching lever 252 of the switching means 25 is rotated to the neutral position N, the spanner Removal of the 20 objects 2A is further simplified.

  On the other hand, when loosening the object 2A, the switching lever 252 of the switching means 25 is turned to the neutral position N to engage the steel ball 262 of the positioning mechanism 26 in the same manner as when the object 2A is tightened. Each roller 22 held by the retainer 23 is engaged with the joint hole 264a and is opposed to the play area 241 of the wedge guide groove 24 to be in a free state.

  Next, after engaging the cylindrical portion 213 of the spanner main body 21 in this state with the circular hole 2Aa of the object 2A together with the retainer 23, the switching lever 252 of the switching means 25 is rotated to the loosening position UL shown in FIG. 9C. Manipulate. Accordingly, each roller 22 held by the retainer 23 is opposed to the wedge region 243 on the right side of the wedge guide groove 24. Therefore, the spanner body 21 is moved in the direction of arrow B (counterclockwise direction) in FIG. Each roller 22 bites between the wall surface of the right wedge region 243 and the inner peripheral surface of the round hole 2Aa of the object 2A, so that the cylindrical portion 213 of the spanner body 21 and the object 2A are integrated. Then, the inner peripheral surface of the object 2 </ b> A is held by the tip of the spanner 20. Therefore, if the spanner 20 is rotated in the direction of arrow B, the object 2A can be loosened.

  When switching from the neutral position N shown in FIG. 9A to the loosening position UL shown in FIG. 9C and starting the loosening operation of the object 2A, the roller 22 has a large friction coefficient on the rolling surface. The roller 22 rolls without idling and securely bites into it, so that the wedge action is quickly exhibited.

  In addition, since an annular cured film is formed along the entire circumference of the rolling surface of the roller 22, the roller 22 is interposed between the wall surface of the wedge region 243 and the inner peripheral surface of the object 2A during the loosening operation. The biting force can be greatly increased, and the gripping force can be further increased.

  When the spanner 20 is removed from the object 2A after the loosening operation of the object 2A is completed, the wedge area of the roller 22 is obtained by slightly rotating the spanner body 21 in the direction opposite to the arrow B in FIG. 9C. The biting between the wall surface 243 and the inner peripheral surface of the round hole 2Aa of the object 2A may be canceled. Thereby, the spanner 20 can be easily removed from the target 2A.

  If the biting between the wall surface of the wedge region 243 of the roller 22 and the inner peripheral surface of the round hole 2Aa of the object 2A is released, the wrench can be operated by rotating the switching lever 252 of the switching means 25 to the neutral position N. Removal of the 20 objects 2A is further simplified.

  According to the spanner 20 of such another embodiment, it is a clamping mechanism for detachably gripping the round hole 2Aa of the object 2A, and a plurality of long holes 231 are formed at intervals in the circumferential direction. The cylindrical retainer 23 whose outer peripheral surface faces the inner peripheral surface of the round hole 2Aa, a handle portion 211 as a handle portion, and a columnar portion 213 formed at one end of the handle portion 211, A plurality of wedge guide grooves 24 are formed on the outer peripheral surface at intervals in the circumferential direction, and have a spanner body 21 as a clamp mechanism body surrounded by the retainer 23, and a diameter larger than the thickness of the retainer 23. Are respectively accommodated in the long holes 231, and roll in the wedge regions 242 and 243 and the play region 241 in the wedge guide groove 24 as the retainer 23 rotates, and in the wedge regions 242 and 243 The inner peripheral surface of the round hole 2Aa elephant product 2A grasped by wedge action, comprising a plurality of rollers 22 to release the play area 241 Dekusabi action.

  Since the rolling surface of the roller 22 is subjected to surface treatment for increasing the friction coefficient, the friction coefficient of the roller rolling surface is increased. Therefore, the roller 22 can easily bite between the wall surface of the wedge guide groove 24 in the wedge regions 242 and 243 and the inner peripheral surface of the object 2A, so that the wedge action can be exhibited quickly.

  According to the spanner 20 of another embodiment, since the rolling surface of the roller 22 is subjected to hard chrome plating as a surface treatment for increasing the coefficient of friction, an annular cured film is formed along the entire circumference of the roller 22. The roller 22 is formed between the wall surface of the wedge guide groove 24 and the inner peripheral surface of the object 2A, and the gripping force can be further increased.

  According to the spanner 20 of another embodiment, the play area 241 is connected to the wedge areas 242 and 243 on one side and the other side in the circumferential direction of the cylindrical portion 213, respectively. Conversely, it becomes possible to switch easily. Therefore, the efficiency of the clamping operation is further improved.

  Further, according to the spanner 20 of another embodiment, the switching lever 252 is swingably attached to the handle portion 211, and the switching lever 252 rotates the retainer 23 with its free end engaged with the retainer 23. Therefore, the switching operation between the tightening operation and the loosening operation can be performed easily and reliably.

  Next, still another embodiment of the present invention will be described. FIG. 10 is a plan view showing a tool clamper according to still another embodiment. FIG. 11 is an exploded perspective view showing a tool clamper according to still another embodiment. 12 is a side view showing a partial cross-section along XII-XII in FIG. FIG. 13 is an explanatory diagram showing the tool clamper shown in FIG. 12 in an enlarged manner. FIG. 14 is an enlarged cross-sectional view for explaining the operation of the retainer and the ring portion of the tool clamper according to still another embodiment of the present invention, with the cross section taken along a plane perpendicular to the central axis and the positional relationship between the roller and the wedge guide groove. Yes, (A) shows a state in which the wedge action is released, and (B) and (C) show a state in which the wedge action is exerted. Further, with respect to other embodiments, the same components as those in the above-described embodiments are denoted by the same reference numerals, description thereof will be omitted, and different configurations will be described below.

  The tool clamper 30 shown in FIGS. 10 to 12 includes a clamping mechanism that holds the cutting tool 1 so as not to rotate when the cutting tool 1 is chucked or unchucked to the tool holder 2B, and a base portion. Prepare. Specifically, a tool clamper main body 31, a roller 12 of a clamp mechanism provided at the tip of the tool clamper main body 31, a retainer 13, a wedge guide groove 14, and a switching means 15 are provided.

  The tool clamper main body 31 includes a ring portion 111 having a tapered inner diameter that allows a part of the holder main body 2C included in the tool holder 2B, for example, the tapered shank portion 2Ca of the holder main body 2C to be detachably inserted, A handle portion 313 extending in the direction and having one end coupled to the outer periphery of the ring portion 111, and a base portion 312 that is coupled to the other end of the handle portion 313 and holds the axis of the ring portion 111 vertically. ing.

  In FIG. 11, the holder main body 2C of the tool holder 2B has a gripping flange portion 2Cb formed at the large-diameter side end portion of the taper shank portion 2Ca and a taper from the end surface of the flange portion 2Cb on the side opposite to the taper shank portion. A chuck cylinder 2Cc provided with the axis line aligned in the opposite direction to the shank portion 2Ca is provided, and a fastening cylinder 2Cd is fitted to the outer periphery of the chuck cylinder 2Cc via a needle roller (not shown). Therefore, the shank portion of the cutting tool 1 inserted into the chuck cylinder 2Cc can be chucked by rotating the tightening cylinder 2Cd clockwise to reduce the diameter of the chuck cylinder 2Cc. Further, the cutting tool 1 held by the chuck cylinder 2Cc can be unchucked by rotating the tightening cylinder 2Cd counterclockwise.

  As shown in FIGS. 10 to 14, the roller 12 inserts the taper shank portion 2Ca of the holder main body 2C into the ring portion 111 having a tapered inner diameter of the tool clamper main body 31, and inserts the holder main body 2C in the right or left direction. It is intended to bite between the inner peripheral surface of the ring portion 111 and the outer peripheral surface of the tapered shank portion 2Ca as an object when a rotational torque is applied, and to grip the tapered shank portion 2Ca by a wedge action. Presents.

  Next, the operation of the tool clamper 30 configured as described above will be described.

  When chucking the cutting tool 1 on the tool holder 2B, first, the base portion 312 of the tool clamper main body 31 is fixed to a work table (not shown) or the like. In this state, the switching lever 152 of the switching means 15 is turned to the neutral position N, and the steel balls 162 of the positioning mechanism 16 are engaged with the engagement holes 164a, whereby each roller 12 held by the retainer 13 is engaged. As shown in FIG. 14A, the play guide area 14 of the wedge guide groove 14 is opposed to the play area 141 and held in a free state.

  Next, after the taper shank portion 2Ca of the tool holder 2B is inserted into the retainer 13 mounted in the ring portion 111 of the tool clamper main body 31 in this state, the switching lever 152 of the switching means 15 is inserted into the engagement hole 164b. By rotating to the king position C, the rollers 12 held by the retainer 13 are opposed to the wedge region 142 on the left side of the wedge guide groove 14. Next, with the shank portion of the cutting tool 1 inserted into the chuck cylinder 2Cc of the holder main body 2C set on the tool clamper main body 31, the clamping cylinder 2Cd is rotated clockwise using the wrench 3 shown in FIG. . Accordingly, when the entire holder body 2C is rotated in the counterclockwise direction indicated by the arrow A in FIG. 14B, each roller 12 is positioned between the wall surface of the left wedge region 142 and the outer peripheral surface of the taper shank portion 2Ca. Bite into. Thereby, the ring part 111 and the taper shank part 2Ca of the tool clamper main body 31 are integrated, and the outer peripheral surface of the taper shank part 2Ca is gripped by the tip of the tool clamper 30. Therefore, the tool holder 2B is clamped to the tool clamper body 31. Accordingly, when the clamping cylinder 2Cd is rotated clockwise by the wrench 3 in this clamped state, the chuck cylinder 2Cc is reduced in diameter, and the shank portion of the cutting tool 1 inserted into the chuck cylinder 2Cc is chucked. Will be.

  When the neutral position N shown in FIG. 14A is switched to the chucking position C shown in FIG. 14B and the chucking operation of the cutting tool 1 is started, the friction coefficient of the rolling surface of the roller 12 is large. Thus, the roller 12 rolls without being idle and bites in with certainty, and the wedge action is quickly exhibited.

  Further, since an annular cured film is formed along the entire circumference on the rolling surface of the roller 12, the roller 12 is positioned between the wall surface of the wedge region 142 and the outer peripheral surface of the taper shank portion 2Ca during the chucking operation. The gripping force can be further increased.

  When the tool holder 2B is extracted from the tool clamper 30 after the cutting tool 1 is chucked on the tool holder 2B, the entire tool holder 2B is slightly rotated in the direction opposite to the arrow A in FIG. The biting into the wall surface of the wedge region 142 of the roller 12 and the outer peripheral surface of the taper shank portion 2Ca may be released. Thereby, the tool holder 2B can be easily extracted from the tool clamper 30.

  The tool of the tool holder 2B can be obtained by rotating the switching lever 152 of the switching means 15 to the neutral position N after releasing the biting into the wall surface of the wedge region 142 of the roller 12 and the outer peripheral surface of the taper shank 2Ca. The extraction work from the clamper 30 is further simplified.

  On the other hand, when the cutting tool 1 is unchucked from the tool holder 2B, the switching lever 152 of the switching means 15 is rotated to the neutral position N and positioned in the same manner as when the cutting tool 1 is chucked. The steel ball 162 of the mechanism 16 is engaged with the engagement hole 164a, and each roller 12 held by the retainer 13 is opposed to the play area 141 of the wedge guide groove 14 to be in a free state.

  Next, after the taper shank portion 2Ca of the tool holder 2B is inserted into the retainer 13 mounted in the ring portion 111 of the tool clamper body 31 in this state, the switching lever 152 of the switching means 15 is unlocked by the locking hole 164c. By rotating to the chucking position UC, each roller 12 held by the retainer 13 is opposed to the wedge region 143 on the right side of the wedge guide groove 14. Next, the clamping cylinder 2Cd of the tool holder 2B set on the tool clamper body 31 is rotated counterclockwise using the wrench 3 shown in FIG. Accordingly, when the entire holder body 2C is rotated in the clockwise direction indicated by the arrow B in FIG. 14C, each roller 12 is interposed between the wall surface of the right wedge region 143 and the outer peripheral surface of the taper shank portion 2Ca. Bite. Thereby, the ring part 111 and the taper shank part 2Ca of the tool clamper main body 31 are integrated, and the tool holder 2B is clamped to the tool clamper main body 31. Therefore, when the clamping cylinder 2Cd is rotated counterclockwise by the wrench 3 in this clamped state, the chuck cylinder 2Cc is restored to the original diameter, and the shank portion of the cutting tool 1 is unchucked. Thereby, the cutting tool 1 can be replaced.

  When the neutral position N shown in FIG. 14 (A) is switched to the unchucking position UC shown in FIG. 14 (C) and the unchucking operation of the cutting tool 1 is started, the friction coefficient of the rolling surface of the roller 12 is increased. Since the roller 12 is large, the roller 12 rolls without being idle and bites in with certainty, and the wedge action is quickly exhibited.

  In addition, since an annular cured film is formed on the rolling surface of the roller 12 along the entire circumference, the roller 12 is positioned between the wall surface of the wedge region 143 and the outer peripheral surface of the object 2 during the unchucking operation. The gripping force can be further increased.

  When the tool holder 2B with the cutting tool 1 unchucked is removed from the tool clamper 30, the entire tool holder 2B is slightly rotated in the direction opposite to the arrow B in FIG. The biting into the wall surface of the region 143 and the outer peripheral surface of the tapered shank portion 2Ca may be released. Thereby, the tool holder 2B can be easily extracted from the tool clamper 30.

  The tool of the tool holder 2B can be obtained by rotating the switching lever 152 of the switching means 15 to the neutral position N after releasing the biting into the wall surface of the wedge region 143 of the roller 12 and the outer peripheral surface of the taper shank 2Ca. The extraction work from the clamper 30 is further simplified.

  According to the tool clamper 30 of still another embodiment as described above, a clamp mechanism for detachably gripping the outer peripheral surface of the taper shank portion 2Ca as an object, wherein a plurality of long holes 131 are provided in the circumferential direction. The cylindrical retainer 13 is formed at intervals and surrounds the outer peripheral surface of the taper shank portion 2Ca, the handle portion 313, and the ring portion 111 formed at one end of the handle portion 313. The ring portion 111 has an inner periphery. A plurality of wedge guide grooves 14 are formed on the surface at intervals in the circumferential direction, and a tool clamper main body 31 as a clamp mechanism main body for accommodating the retainer 13 on the inner peripheral side, and a diameter larger than the thickness of the retainer 13 And the wedge regions 142 and 143 and the play region 141 in the wedge guide groove 14 are rolled as the retainer 13 rotates. The outer peripheral surface of the tapered shank portion 2Ca is gripped by the wedge action in the rust area 142 comprises a plurality of rollers 12 to release the play area 141 Dekusabi action.

  Since the rolling surface of the roller 12 is subjected to surface treatment for increasing the friction coefficient, the friction coefficient of the roller rolling surface is increased. Accordingly, the roller 12 can easily bite between the wall surface of the wedge guide groove 14 and the outer peripheral surface of the taper shank portion 2Ca in the wedge regions 142 and 143, and the wedge action can be rapidly exhibited.

  Further, according to the spanner 10 of the present embodiment, the rolling surface of the roller 12 is subjected to hard chrome plating as a surface treatment for increasing the coefficient of friction, so that an annular cured film is formed along the entire circumference of the roller 12. In addition, the roller 12 can greatly bite between the wall surface of the wedge guide groove 14 and the outer peripheral surface of the tapered shank portion 2Ca, and the gripping force can be further increased.

  According to the tool clamper 30 of still another embodiment, the play area 141 is connected to the wedge areas 142 and 143 on one side and the other side in the circumferential direction of the ring portion 111, respectively. It is possible to easily switch to operation or vice versa. Therefore, the efficiency of the clamping operation is further improved.

  Further, according to the tool clamper 30 of still another embodiment, the switching lever 152 is swingably attached to the handle portion 313, and the switching lever 152 rotates the retainer 13 with its free end engaged with the retainer 13. Therefore, the switching operation between the chucking position and the neutral position can be performed easily and reliably.

  Although the embodiments of the present invention have been described with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

  The clamping mechanism according to the invention is advantageously used in bolts, nuts and tool holders.

  1 Cutting tool, 2, 2A object, 2Aa round hole, 2B tool holder, 2C holder body, 2Ca taper shank, 3 wrench, 10 spanner, 11 spanner body, 12 rollers, 12s cured film, 13 retainer, 14 wedge guide Groove, 15 switching means, 16 positioning mechanism, 17 lid member, 20 spanner, 21 spanner body, 22 roller, 22s cured film, 23 retainer, 24 wedge guide groove, 25 switching means, 30 tool clamper, 31 tool clamper body, 111 Ring part, 112 Handle part, 131 Long hole, 141 Play area, 142, 143 Wedge area, 151 pin, 152 Switching lever, 211 Handle part, 212 Base part, 213 Cylinder part, 231 Long hole, 241 Play area, 242, 243 Wedge area, 251 pin, 252 Switching lever, 312 base, 313 handle.

Claims (9)

A clamping mechanism for detachably gripping the outer peripheral surface of a cylindrical object,
A plurality of elongated holes formed at intervals in the circumferential direction, and a cylindrical retainer surrounding the outer peripheral surface of the columnar object;
A ring portion formed at one end of the handle portion and the handle portion, wherein the ring portion is formed with a plurality of wedge guide grooves extending in the circumferential direction on the inner peripheral surface at intervals in the circumferential direction; A clamp mechanism body for accommodating the retainer on the side;
The retainer has a diameter larger than the thickness of the retainer, is accommodated in each of the elongated holes, moves in the circumferential direction in the wedge guide groove with the rotation of the retainer, A plurality of roller rollers located in either the wedge area or the play area,
In the wedge region, the plurality of roller-shaped rollers roll between the wall surface of the wedge guide groove and the outer peripheral surface of the cylindrical object as the ring portion rotates, and the wedge guide groove Gripping the outer peripheral surface of the cylindrical object by a wedge action sandwiched between the wall surface of the cylindrical object and the outer peripheral surface of the cylindrical object, and releasing the wedge action in the play area,
2. A clamping mechanism according to claim 1, wherein the rolling surfaces of the plurality of roller-shaped rollers are subjected to a surface treatment for increasing a friction coefficient. A clamping mechanism for detachably holding a round hole of a cylindrical object,
A plurality of elongated holes are formed at intervals in the circumferential direction, and a cylindrical retainer whose outer peripheral surface faces the inner peripheral surface of the round hole;
Shank and has a cylindrical portion formed on one end of該柄portion, said cylindrical portion with a plurality of wedge guide grooves extending in an outer peripheral surface in the circumferential direction are formed at intervals in the circumferential direction, the retainer A clamp mechanism body to be surrounded;
The retainer has a diameter larger than the thickness of the retainer, is accommodated in each of the elongated holes, moves in the circumferential direction in the wedge guide groove with the rotation of the retainer, A plurality of roller rollers located in either the wedge area or the play area,
In the wedge region, the plurality of roller-shaped rollers roll between the wall surface of the wedge guide groove and the inner peripheral surface of the cylindrical object in accordance with the rotation of the cylindrical portion, and the wedge guide by the wedge action sandwiched between the inner peripheral surface of the wall and the object of the cylindrical shape of the groove to grip the inner circumferential surface of the object of the cylindrical, in the play area, and release the wedging action,
2. A clamping mechanism according to claim 1, wherein the rolling surfaces of the plurality of roller-shaped rollers are subjected to a surface treatment for increasing a friction coefficient.   The clamp mechanism according to claim 1 or 2, wherein the surface treatment is a blast process in which particles collide with a rolling surface.   The clamp mechanism according to claim 1 or 2, wherein the surface treatment is a plating treatment.   The clamp mechanism according to claim 4, wherein the plating process is a hard chrome plating process.   The clamp mechanism according to claim 1, wherein the play area is connected to the wedge area on one side and the other side in the circumferential direction of the ring part or the column part. A switch lever is swingably attached to the handle,
The clamp mechanism according to claim 6, wherein the switching lever has a free end engaged with the retainer to rotate the retainer. A clamping mechanism according to claim 7;
A spanner comprising a handle portion extending from the other end of the handle portion. A clamping mechanism according to claim 7;
A tool clamper comprising a base portion coupled to the handle portion.

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