JPH0224568Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a tap holder.

[Conventional technology]

Conventionally, this type of tap holder was developed by Japanese Patent Application Laid-open No. 1986-
Publication No. 94577 is mentioned.

In this conventional structure, a collet capable of holding a tap is housed in a housing at the tip (lower part) of the tap holder main body which is driven and rotated, and a collet with respect to the housing is placed between the inner circumferential surface of the housing and the outer circumferential surface of the collet. A first cylinder that cannot be rotated but is rotatable with respect to the collector is inserted, and a second cylinder that is rotatable with respect to the housing but not rotatable with respect to the collector is inserted into the distal end of the first cylinder.
A plurality of through holes are formed in the cylinder at regular intervals in the axial direction, a pin is inserted into the through holes, and the pin is slidably inserted into the flange provided at the tip of the pin and the base side (upper side) of the through hole. A spring is installed between the bushing and the pin to apply elastic pressure toward the tip, a radial notch is formed at the lower end of the through hole, and a radial notch is formed in the second cylinder at a position corresponding to the through hole. A clutch groove is formed between the clutch groove and the notch at the lower end of the through hole, and the clutch roller is held under pressure by the pin, and a torque adjustment ring is attached to the inner surface of the tip of the housing. This torque adjustment ring is connected to the second cylinder by a ball bearing.

Therefore, when the tap holder body rotates, the first
The second cylinder also rotates together with this, while the second cylinder is not fixed to the main body of the holder as described above, but a part of the clutch roller pressurized by the pin Since it fits into the clutch groove of the second cylinder, it rotates together with the first cylinder, and the second cylinder
Since it is circumferentially fixed to the collet by the key, the collet also rotates, and rotation is eventually transmitted to the tap.

By the way, during tapping, if the torque applied to the tap exceeds the pressing force of the spring, the clutch roller will come off the clutch groove, the first cylinder will idle, and the rotational force will not be transmitted to the second cylinder, so that the torque applied to the tap will not be transmitted to the second cylinder. It will perform the function of a safety clutch.

[Problem that the invention attempts to solve]

However, in the case of the conventional structure described above, line contact is obtained due to the clutch structure of the clutch roller and clutch groove, which improves the clutching performance and suppresses friction between both members compared to point contact in the case of balls. During overload idling, the clutch roller is held in the notch at the tip of the through hole of the first cylinder, so that the contact area between the flange at the tip of the pin and the clutch roller or the clutch roller and the second One of the contact parts with the cylinder is in rolling line contact, while the other is in sliding line contact, so there is a possibility that a stable clutch function cannot be maintained for a long period of time due to wear due to friction between both members.

In addition, in the case of the above conventional structure, a pin, a spring, and a bush are inserted into each of the plurality of through holes, the clutch roller is held in the notch, the first cylinder is inserted into the housing, and then the second cylinder is inserted into the housing. It is troublesome to assemble because it requires inserting and assembling, lowering efficiency of assembly, troublesome to disassemble for maintenance, and having a complicated structure.

[Means for solving problems]

The purpose of the present invention is to eliminate these inconveniences, and its gist is to form a holding part that can detachably hold the tap at the tip of the holder, and to form a flange in the middle of the outer periphery. A plurality of support grooves are formed in the flange, two transmission rollers are rotatably housed in each of the bearing grooves, and a drive cylinder that covers the transmission rollers is rotatably mounted on the outer peripheral surface of the holder. A rolling surface is provided on the base side of the drive cylinder, facing the side surfaces of the base of the flange, and on which the transmission roller on the base side rolls; A clutch member having a clutch surface on which a side transmission roller rolls is rotatable with respect to the holder, and is movable in the axial direction with respect to the drive cylinder in a non-rotating state by a locking groove and a locking roller. A transmission recess is provided in the clutch surface in which the transmission roller on the distal end side can be inserted and ride on the clutch surface, a cover cylinder that covers the locking roller is fitted in the drive cylinder, and the driving An adjustment nut is screwed onto the tip of the cylinder so that it can be moved in the axial direction by rotation, and a plurality of disc springs are provided between the adjustment nut and the clutch member to bias the clutch member toward the transmission roller. The tap holder is characterized in that the tap holder is constructed with an intervening structure.

[Effect]

When the tap is attached to the holding part of the holder and the drive cylinder is driven and rotated, the clutch member rotates by the action of the locking groove and the locking roller, and the holder also rotates by the action of the transmission roller and the transmission recess, and the tap works. When the tap is rotated and an overload is applied to the tap, the clutch member moves toward the distal end against the disc spring, and the transmission roller rides on the clutch surface of the clutch member toward the distal end, causing the holder to idle. At this time, the drive cylinder and clutch member rotate together,
In addition, since two transmission rollers are rotatably housed side by side in the support notch groove, the contact area between the base side transmission roller and rolling surface and the contact area between the clutch surface and the tip side transmission roller both roll. It becomes contact.

In addition, for assembly, store the transmission roller in the support notch, cover the transmission roller with the drive cylinder, insert the clutch member and disc spring into the drive cylinder, screw the adjustment nut onto the drive cylinder, and then A cover tube that covers the locking roller is fitted onto the cover tube.

〔Example〕

1 to 5 show a preferred embodiment of the present invention. Reference numeral 1 denotes a holder, and the tip of the holder 1 is provided with a holding portion 3 capable of holding a tap 2 in a removable manner.

In this case, the holding part 3 is composed of a locking ball 4, a locking tube 5, a return spring 6, a square hole 7, and a through hole 8,
The tap 2 can be detachably held by the action of the escape taper groove 9 and the locking ball 4.

Reference numeral 10 denotes a flange, and the flange 10 is formed protrudingly in the middle of the outer circumference of the holder 1.
A plurality of support notch grooves 11 (six in this case) are formed in each support notch groove 11, and two transmission rollers 12 and 13 are housed in each support notch groove 11.

14 is a drive barrel, and the drive barrel 14 is connected to the holder 1.
is rotatably provided on the outer peripheral surface of the drive cylinder 14 , has a drive claw part 15 formed on the base side, covers the transmission rollers 12 , 13 on the inner peripheral surface of the inner hole 16 of the drive cylinder 14 , and is rotatably provided on the base side of the drive cylinder 14 . A rolling surface 17 is formed on each side of the base of the flange 10, on which the transmission roller 12 on the base side rolls.

18 is a clutch member, and the clutch member 1
Three locking grooves 19 are formed on the outer peripheral surface of the drive cylinder 1.
A retaining hole 20 is formed on the outer periphery of 4, and a retaining roller 21 is engaged with the retaining groove 19 while being retained by the retaining hole 20.
A cover cylinder 22 that covers the locking roller 21 is fitted onto the outer circumferential surface of the drive cylinder 14, so that the clutch member 18 is rotatable relative to the holder 1 and rotated in the axial direction with respect to the drive cylinder 14 in a non-rotating state. The clutch member 18 is made movable, and forms a clutch surface 23 that faces both sides of the distal end of the flange 10 of the clutch member 18 and on which the transmission roller 13 on the distal end side rolls.
3 is formed with a plurality of transmission recesses 24 (six in this case) into which the transmission roller 13 on the tip end side can fit and ride on the clutch surface 23.

25 is a disc spring, and 26 is an adjustment nut. A plurality of disc springs 25 (in this case, five disc springs) are inserted into the inner hole 16 of the drive cylinder 14, and the adjustment nut 26 is screwed onto the tip of the drive cylinder 14. , a locking bolt 28 screwed onto the outer periphery of the drive cylinder 14 in the groove 27 of the adjustment nut 26
I am trying to lock it.

Since this embodiment has the above-mentioned configuration, when the tap 2 is attached to the holding part 3 of the holder 1 and the drive cylinder 14 is driven and rotated via the drive claw part 15, a locking groove is formed as shown in the transmission line R in FIG. 19 and the locking roller 21, the clutch member 18 rotates, and the transmission rollers 12, 13
Due to the action of the transmission recess 24, the holder 1 also rotates, and the tap 2 rotates for work.
When an overload is applied to the clutch member 18, the disc spring 2
5, the transmission roller 13 on the tip side rides on the clutch surface 23 of the clutch member 18, allowing the holder 1 to idle, and at this time, the drive cylinder 14 and the clutch member The transmission rollers 18 and 18 rotate together due to the action of the locking groove 19 and the locking roller 21, and the transmission rollers 12 and 13 are rotatably housed side by side in the support notch groove 11, so the transmission roller 12 on the base side rotates together with the locking groove 19 and the locking roller 21. The contact portion between the clutch surface 23 and the rolling surface 17 and the contact portion between the clutch surface 23 and the transmission roller 13 on the tip end side can both be made into rolling contact, and friction between the transmission rollers 12, 13 and the clutch surface 23 can be suppressed. In addition, a stable clutch function can be obtained over a long period of time, and during assembly, the transmission rollers 12 and 13 are housed in the support notch 11.
Cover the transmission rollers 12 and 13 with the drive barrel 14, insert the clutch member 18 and disc spring 25 into the drive barrel 14, screw the adjustment nut 26 onto the drive barrel 14, and cover the locking roller 21 with the drive barrel 14. This can be easily done by simply fitting the cover tube 22, improving assembly work efficiency and reducing manufacturing costs.

[Effect of idea]

As described above, in the present invention, when an overload is applied to the tap, the clutch member moves toward the distal end against the disc spring, and the transmission roller on the distal end rides on the clutch surface of the clutch member. It can idle, and at this time, the drive cylinder and clutch member rotate together due to the action of the locking groove and locking roller, and the two transmission rollers are rotatably housed side by side in the support notch groove. The contact area between the transmission roller on the base side and the rolling surface and the contact area between the clutch surface and the transmission roller on the tip side can both be made into rolling contact, suppressing friction between the transmission roller and the clutch surface and providing a long-term life. A stable clutch function can be obtained, and during assembly, the transmission roller is housed in the support notch, and the drive cylinder covers the transmission roller.
This can be easily done by simply inserting the clutch member and disc spring into the drive cylinder, screwing the adjustment nut onto the drive cylinder, and fitting the cover cylinder that covers the locking roller onto the drive cylinder, improving assembly work efficiency. This makes it possible to reduce manufacturing costs.

As described above, the intended purpose can be fully achieved.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a longitudinal sectional view, FIG. 2 is a longitudinal sectional view showing its operating state, FIG. 3 is a sectional view taken along the line A-A, and FIG. is B-
A sectional view taken along the line B, and FIG. 5 is an enlarged sectional view of the main parts. 1... Holder, 2... Tap, 3... Holding part,
10...Flange, 11...Support notch groove, 12,
13...Transmission roller, 14...Drive cylinder, 17...
Rolling surface, 18... Clutch member, 19... Locking groove, 21... Locking roller, 22... Cover cylinder, 2
3...Clutch surface, 24...Transmission recess, 25...
Disc spring, 26...adjustment nut.

Claims (1)

[Scope of utility model registration request] A holding part capable of removably holding the tap is formed at the tip of the holder, and a flange is formed at the middle part of the outer periphery, and a plurality of supporting notched grooves are formed in the flange, and two supporting notched grooves are formed in each of the supporting notched grooves. transmission rollers are rotatably housed side by side, a drive tube that covers the transmission rollers is rotatably provided on the outer circumferential surface of the holder, and a drive tube is provided on the base side of the drive tube facing the base side surfaces of the flange. A clutch member is provided with a rolling surface on which the side transmission roller rolls, and a clutch member having a clutch surface on which the transmission roller on the tip side rolls, which faces both sides of the tip of the flange, is provided on the holder. The drive cylinder is rotatable and movable in the axial direction while being prevented from rotating by a locking groove and a locking roller with respect to the drive cylinder, and the transmission roller on the distal end side is recessed into the clutch surface. providing a transmission recess that can be ridden on, a cover cylinder that covers the locking roller is fitted to the drive cylinder, and an adjustment nut is screwed onto the tip of the drive cylinder so that it can be moved in the axial direction by rotation; A tap holder characterized in that a plurality of disc springs are interposed between the adjustment nut and the clutch member to bias the clutch member toward the transmission roller.