KR20150113591A - Slip control function using Rolling contact torque screwdriver with a torque limit - Google Patents

Abstract

The present invention relates to a torque limit screwdriver with a function of controlling rolling contact-type slip torque, which comprises: a handle including a torque adjusting screw; a holder member having a first slip shaft; an one-way clutch assembled to deliver rotational force only in a loosening direction of a screw tip; a fixing housing coupled to be united with the handle; a first axial ball bearing where a plurality of first slip balls are arranged on a rear side; an operation housing rotatably assembled on a slip guiding groove and having a second slip shaft on the rear side; a second axial ball bearing including a plurality of second slip balls; and a slip torque adjusting bolt adjusting slip torque by controlling virtual pressure of an elastic member.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a torque limit driver having a rolling contact type slip torque adjusting function,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a torque limit driver used for fastening a screw, and particularly, in a medical procedure, when a fastening screw is fastened using a torque limit driver, To a torque limit driver having a rolling contact type slip torque adjusting function.

The torque limit driver, which is generally used for medical purposes, is one of the surgical tools used for tightening the surgical fastening screws in surgical, orthopedic and dental procedures.

As a first prior art of such a torque limit driver, Korean Registered Utility Model No. 20-0461856 (Aug. 3, 2012) "Medical Manual Driver" is disclosed.

Although the medical manual screw driver according to the first prior art has a convenient structure for operating with one hand, there is a problem that the fastening screw must be tightened with an appropriate torque according to skill of the practitioner in the process of fastening the fastening screw.

Therefore, it is very difficult to fasten the various fastening screws with the same torque according to the operator, and when the fastening screw is tightened to the maximum, excessive force is applied to the cartilage or nerve to cause a medical accident.

As a second prior art of a torque limit driver for tightening fastening screws by maintaining an appropriate torque in the past, Korean Patent Laid-Open No. 10-2009-0129232 (December 16, 2009) entitled " Manual Driver for Torque Measurement " .

The manual driver for torque measurement according to the second prior art provides a manual driver for torque measurement capable of measuring a torque applied to a screw while rotating the screw. However, in the process of tightening the screw, And it is not easy to measure the torque value as described above in the operation procedure requiring quick operation.

In addition, most of the conventional torque limit drivers have a mechanical structure based on the principle of the ratchet operation, so that the slip torque configuration that prevents the force from being applied when the fastening screw is fully tightened is mostly structured by the ratchet operation principle. The vibration was transmitted to the screw tip as it was, and the vibration became a factor causing the dangerous situation in the operation such as stimulation of cartilage or nerve.

In the torque limit configuration using the conventional ratchet system, there is a problem that a clearance is generated due to friction between parts when using for a long period of time, thereby causing an operating error or failure that the torque limit function can not be exerted when a tolerance due to clearance occurs there was.

Korea Registered Utility Model No. 20-0461856 (Aug. 3, 2012) Korean Patent Publication No. 10-2009-0129232 (December 16, 2009)

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a torque limit driver for use in a medical procedure, So that the practitioner can feel the soft vibrating feeling of rolling contact by a pair of axial ball bearings, so that the operator does not damage the tissue of the cartilage and does not stimulate the nerve And to provide a torque limit driver having a rolling contact type slip torque adjusting function which is designed to perform a safe fastening operation.

A torque limit driver having a rolling contact type slip torque adjusting function according to an embodiment of the present invention includes a handle having a hollow portion penetrating the inside thereof and having a torque adjusting screw portion for adjusting a torque from an inlet on a rear inner circumferential surface thereof; A shaft-shaped holder member having a first slip shaft, which is assembled to the inlet of the hollow portion to be rotated together with the handle, A one-way clutch assembled to the outside of the holder member so as to transmit a rotational force only in a releasing direction of the screw tip, and assembled inside the hollow portion; A fixed housing fitted to an outer side of the holder member and fixed to be integral with the handle; A first axial ball bearing mounted on the rear side of the fixed housing and having a plurality of first slip balls radially arranged on a rear surface thereof; Wherein the first slip shaft is rotatably assembled in a slip guide groove formed in the center and a second slip shaft is formed on the rear surface so that the first slip shaft is axially movably joined to the shaft, A movable housing; A second axial ball bearing mounted on the front side of the movable housing and having a plurality of second slip balls engaged with the first slip balls of the first axial ball bearing and in rolling contact with the rotational torque of the handle; And the torque adjusting screw portion is screwed to the shaft so as to be movable in the axial direction of the second slip shaft, and the pressing force of the elastic member is adjusted so that, when the screw tip is maximally tightened, And a slip torque adjusting bolt for adjusting a slip torque generated when the ball passes over the rolling contact with the ball.

Also, in the embodiment of the present invention, the first slip ball and the second slip ball are assembled to the respective retainers of the first and second axial ball bearings, one side of which protrudes 1/3 toward the open side of the retainer And the other of the first slip ball and the second slip ball protruding from the rear surface of the fixed housing and the front surface of the movable housing through the through hole formed through the bottom surface, A plurality of spherical slip grooves are radially formed.

Further, in the embodiment of the present invention, matching holes are formed between the first slip ball and the second slip ball on the bottom surfaces of the respective retainers of the first and second axial ball bearings, And a mating protrusion is formed on the front surface of the movable housing to correspond to the mating hole.

In addition, in the embodiment of the present invention, the fitting tolerance between the first slip shaft and the slip groove maintains an intermediate fitting tolerance capable of slipping in the rotation and forward and backward directions, and the tolerance between the inner diameter of the movable housing and the hollow portion is loosely fitted And the first and second axial ball bearings are maintained in a concentric state with the holder member and the stationary housing, thereby achieving slip rotation by rolling contact.

Further, in the embodiment of the present invention, in order to discharge air between the first slip shaft and the slip groove in accordance with the linear motion of the movable housing in the axial direction, the slip groove is formed in the slip groove through the inside of the movable housing, An air discharge path is formed through the gap of the air discharge path.

Further, in the embodiment of the present invention, a lock bolt for preventing loosening of the slip torque adjusting bolt is assembled to the torque adjusting screw portion, and a finishing cap is screwed to the rear of the lock bolt to close the torque adjusting screw portion .

Further, in the embodiment of the present invention, the seal cap further includes a concentric bearing which is assembled outside the holder member.

In the embodiment of the present invention, a mounting groove is formed in front of the holder member, a rear end portion is screwed into the mounting groove, and a tip having a tip detachable groove, which can be used by replacing various types of screw tips, And a holder.

Further, in the embodiment of the present invention, the screw tip may be integrally formed at the tip end portion of the holder member.

The torque limit driver having the rolling contact type slip torque adjusting function of the present invention described above has the following effects.

That is, since the present invention smoothly performs the slip torque limit operation by a pair of axial ball bearings when fastening as a surgical fastening screw using a torque limit driver used in a medical treatment procedure, It is possible to tighten the fastening screw for operation with a constant torque value at all times while maintaining the maximum torque value and also provide convenience of operation in which all of the plurality of fastening screws for operation can be fastened equally.

It is recognized that the effect of the invention is obviously exhibited regardless of whether or not the inventor perceives it, and therefore the effect described above is only some effects according to the present invention, .

Further, the effect of the present invention should be additionally grasped by the entire description of the specification, and even if it is not written in an explicit sentence, those skilled in the art will recognize that the present invention has such an effect If it is an effect, it should be regarded as an effect described in this specification.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a front perspective view showing an outer configuration of a torque limit driver having a rolling contact type slip torque adjusting function according to the present invention. FIG.
FIG. 1B is a rear perspective view showing an outer configuration of a torque limit driver having a rolling contact type slip torque adjusting function according to the present invention. FIG.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a torque limit driver having a sliding contact torque adjusting function.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a torque limit driver having a rolling contact slip torque adjusting function.
FIG. 4 is an enlarged perspective view showing a spherical slip contact configuration of a torque limit driver having a rolling contact type slip torque adjusting structure according to the present invention. FIG.
5 is a longitudinal sectional view showing an assembled state of a torque limit driver having a rolling contact type slip torque adjusting function according to the present invention.
6 is a plan sectional view showing an assembled state of a torque limit driver having a rolling contact type slip torque adjusting function according to the present invention.
Fig. 7 is a rear perspective view showing another configuration of a handle of a torque limit driver having a rolling contact type slip torque adjusting function according to the present invention.
8 is a rear perspective view showing a configuration in which an integral holder member and a screw tip according to another embodiment of the present invention are applied.
FIG. 9A is an exploded perspective view and a longitudinal sectional view showing the internal configuration of FIG. 8; FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

It will be understood by those of ordinary skill in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

In addition, the sizes and shapes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation, and the terms defined in particular in consideration of the configuration and operation of the present invention may vary depending on the intention or custom of the user, And definitions of these terms should be made based on the contents throughout this specification.

FIG. 1A is a front perspective view showing the outer configuration of a torque limit driver having a rolling contact type slip torque adjusting function according to the present invention, FIG. 1B is a rear perspective view showing an outer configuration of a torque limit driver having a rolling contact type slip torque adjusting function, FIG. 2 is an exploded perspective view showing the internal configuration of a torque limit driver having a rolling contact type slip torque adjusting function according to the present invention, FIG. 3 is a perspective view showing the inside of a torque limit driver having a rolling contact type slip torque adjusting function 4 is an enlarged perspective view showing a spherical slip contact structure of a torque limit driver having a rolling contact type slip torque adjusting structure according to the present invention. FIG. 5 is a perspective view of a rolling contact slip A torque limiter having a torque control function, FIG. 6 is a sectional view showing a state in which a torque limit driver having a rolling contact type slip torque adjusting function according to the present invention is assembled, and FIG. 7 is a sectional view showing another example of the handle of the torque limit driver having a rolling contact type slip torque adjusting function according to the present invention. And a rear perspective view showing the configuration.

Reference numeral T in the following description and drawings refers to a screw tip for fastening a screw, reference numeral B denotes a fastening bolt (tongue bolt), and reference symbol P denotes a fastening pin.

 Also, the forward referenced in the description of the specification. The rear side, the front side, or the rear side means the front or the front side of the screw tip T, and the direction toward the handle 100 is defined as rear side.

First, a torque limit driver D having a rolling contact type slip torque adjusting function according to an embodiment of the present invention includes a hollow portion 101 through which the torque limit driver D is inserted. The torque limiting driver D adjusts the torque from the inlet 102 to the rear inner circumferential surface A handle 100 having a torque adjusting screw portion 103 formed therein; A shaft-shaped holder member 200 assembled at an inlet of the hollow portion 101 to rotate together with the handle 100 and having a first slip shaft 202 formed at a rear portion thereof; A one-way clutch 300 assembled to the inside of the hollow portion 101 by assembling the holder member 200 to the outside of the holder member 200 to transmit a rotational force only in a direction of unscrewing the screw tip T; A fixed housing 400 fixed to the handle 100 so as to be integral with the holder 100; A first axial ball bearing 410 mounted to the rear of the fixed housing 400 and having a plurality of first slip balls 411 radially arranged on a rear surface thereof; The first slip shaft 202 is rotatably assembled to the slip guide groove 501 formed in the center and the second slip shaft 520 is formed on the rear surface to be axially movably joined to the shaft, A movable housing 500 which is elastically pressed forward by an elastic member 530 mounted on the housing 101; A plurality of second slip balls 411 which are mounted in front of the movable housing 500 and meshed with the first slip balls 411 of the first axial ball bearing 410 to be in rolling contact with the rotational torque of the handle 100, A second axial ball bearing 510 having a first axial ball bearing 511; And the torque adjusting screw part 103 is screwed into the shaft so as to be movable in the axial direction of the second slip shaft 520 and the pressing force of the elastic member 530 is adjusted so that the maximum And a slip torque adjusting bolt (600) for adjusting a slip torque generated when the second slip ball (511) swings while rolling contact with the first slip ball (411) during a tightening operation.

Hereinafter, each of the configurations according to the present invention will be described in detail.

First, the handle 100 has a hollow structure. The outer structure of the handle 100 is substantially a "T" shape so as to provide an easy visual feeling when fastening or tightening the fastening screw.

The handle 100 may have a straight shape as shown in Figs. 1 to 6 and may have a "T" shape as shown in Figs. 7 to 9A.

The holder member 200 having a first slip shaft 202 attached to and detached from the tip of the handle 100 and a plurality of screw tips T attached to the handle 100, And a detailed configuration will be described later.

A sealing cap 130 is screwed to the front end of the handle such that the holder member 200 is assembled through the sealing cap 130 and an O-ring R is assembled together with the inner circumferential surface of the sealing cap 130 Prevent foreign matter and moisture from flowing into the inside.

A coupling bolt (B) for fixing the clutch housing 310 to the handle 100 is screwed to one side of the assembly part of the sealing cap 130 to thereby seal the sealing cap 130 from the handle 100 And the slip torque adjusting bolt 600 is operated to adjust the slip torque force.

A torque adjusting screw portion 103 is formed on one side of the hollow portion 101 of the handle 100, that is, from the rear inlet 102 of the handle 100, and the slip torque adjusting bolt 600 is assembled.

The torque adjusting screw part 103 is formed to a section slightly deeper than the section in which the elastic member 530 is maximally compressed from the inlet so as to maximally compress the elastic member 530 to set the maximum slip torque value of the slip torque adjusting range .

The handle 100 is attached to the front end of the handle 100 so as to rotate together with the handle 100. The shaft 100 is assembled to the inlet of the hollow portion 101 and has a first slip shaft 202, Member 200 is provided.

The holder member 200 may have a structure for attaching and detaching various types of screw tips T and may include a holder member 200 having a dedicated screw tip T and a detailed description thereof will be given later .

First, the detachable holder member 200 is configured such that various types of screw tips T can be attached and detached, and a mounting groove 201 is formed by being inserted into a tip end portion of the holder member 200.

That is, the holder member 200 is formed as a circular shaft and has the mounting groove 201 in which the one end of the screw tip T is fitted at the tip end portion. The rear end portion is formed to be stepped at a diameter smaller than the outer diameter, 202 are formed.

The mounting groove 201 may have a rectangular cross-sectional shape such that the rotational force of the handle 100 is transmitted together with an inner end of the mounting groove 201, and the screw tip T may be directly detachably assembled.

This configuration provides the advantage of separating the screw tip T from the mounting groove 201 and easily replacing it with another type of screw tip T and the rotational force of the handle 100 is transmitted to the holder member 200 and the screw To be transmitted to the tip (T).

The first slip shaft 202 has a circular cross section and is rotatably assembled to the slip guide groove 501 of the movable housing 500. At this time, the first slip shaft 202 is assembled while maintaining the intermediate fitting tolerance, As shown in FIG.

In addition, the holder member 200 may include a tip holder 203 having a cylindrical shape at its tip so as to be used while replacing various screw tips (T).

1 to 7, a mounting groove 201 having a screw is formed on an inner circumferential surface of the holder 200 in front of the holder 200. The mounting groove 201 is formed in the outer surface of the rear end of the tip holder 203 The threaded portions are screwed together so that the tip holder 203 and the holder member 200 can be detachable from each other.

A tip attachment / detachment groove 206 is formed at the distal end of the tip holder 203 so that various types of the screw tips T can be used.

Here, the tip attachment / detachment groove 206 and the rear end of the screw tip T have a rectangular or hexagonal cross-sectional shape so that rotational force is transmitted.

A screw hole 201a is formed on the outer surface of the rear end of the tip holder 203 so that the screw hole 201a is screwed into the front end of the holder member 203. [ So as to rotate together.

A ring spring 204 is provided on the outer side of the tip holder 203. The ring spring 204 has a ring shape in which a metal plate is bent so that a cutout 204a is formed at one end.

A guide hole 204b is formed on the opposite side of the cutout 204a to receive the fixing ball 205 to support the fixing ball 205 when the fixing ball 205 is elastically pressed outward.

As the fixed ball 205 contacts the end of the screw tip through the air hole 203a to prevent the tool tip from being detached from the mounting groove of the tip holder 203, The fixing ball 205 is pushed outward and the screw tip is separated. At this time, the fixing ball 205 is pushed outward in the inside hole 203a and is restored to the original position.

According to such a configuration, when the tip holder 203 is replaced, the tip holder 203 is separated from the holder member 200 to provide an advantage of easy replacement of the different types of the tip holder 203, It provides easy-to-use tips for easy replacement.

In addition, according to the present invention, the holder member 200 and the screw tip T may be integrally formed as shown in FIGS. 8 to 9A and 9B as a configuration for using a dedicated screw tip.

That is, the holder member 200 and the screw tip T are integrally formed so that the holder member 200 is fixed by the fixing housing 400 and the fastening pins P, , It is possible to provide a dedicated torque limit driver, which is used only for one purpose without replacing the screw tip (T), at a lower cost than the screw tip replacement torque limit driver product have.

Way clutch 300 assembled between the holder member 200 and the hollow portion 101 so as to transmit a rotational force only in a direction of unwinding the screw tip T is provided on the outer side of the holder member 200 do.

The one-way clutch 300 includes an inner diameter of the clutch housing 310 formed by a one-way bearing and an outer diameter of which is fixed to the hollow portion 101 of the handle 100 by a fastening bolt B, So as not to rotate.

The inner diameter of the one-way clutch 300 is idled when the screw tip T is rotated in the tightening direction by being assembled so as to maintain a loose fit tolerance in which the holder member 200 can be easily inserted, The inner diameter of the one-way clutch 300 is reduced while the outer diameter of the holder member 200 is being swung.

Accordingly, since the first and second axial ball bearings 410 and 510 are meshed with each other as described above, the first and second axial ball bearings 410 and 510 are not in rolling contact with each other within a predetermined slip torque range so that the screw (not shown) .

When the tightening force is applied to the first slip ball 411 in a state in which the screw is substantially tightened, the first slip ball 411 of the stationary housing is idling only at its own seat, And the slip torque limit action is exhibited.

When the handle 100 is reversely rotated in the releasing direction, the holder 200 is rotated together with the handle 100 by the one-way clutch 300 so that the screw can be released.

The fixed housing 400 is fixed by a coupling pin P assembled in a direction perpendicular to the outer side of the handle 100 in a state where the fixed housing 400 is fitted to the outside of the holder member 200, Is integrally formed with the member (200) and the handle (100), so that the handle (100) is assembled so as to rotate together when the handle (100) is rotated in the tightening direction or the releasing direction.

The first axial ball bearing 410 is mounted on the rear of the fixed housing 400 and will be described later along with a description of the configuration of the second axial ball bearing 510 provided in front of the movable housing 500.

The movable housing 500 is configured to correspond to the fixed housing 400, and a slip guide groove 501 is formed in the front center of the movable housing 500 so that the first slip shaft 202 is assembled while maintaining an intermediate fitting tolerance .

Accordingly, the slip guide groove 501 and the first slip shaft 202 have a circular cross-sectional shape and idle in a state where the first slip shaft 202 is assembled in the slip guide groove 501, Is configured to be in a state ready for movement before and after.

A second slip shaft 520 extends from the rear of the movable housing 500. The outer diameter of the body of the movable housing 500 is the same as the outer diameter of the fixed housing 400.

The second slip shaft 520 has a diameter corresponding to the inner diameter of the diaphragm spring in a state where a plurality of circular diaphragm springs are overlapped with each other as shown in the figure, The spring is assembled to the outside.

The end of the second slip shaft 520 is formed in a stepped shape and has a rectangular cross-sectional shape, and is assembled to a slip adjusting hole 601 having a rectangular cross-sectional shape formed at the center of a slip torque adjusting bolt 600 described later.

Therefore, when the pressing force of the elastic member 530 is adjusted while the slip torque adjusting bolt 600 is tightened or loosened by rotating forward or backward in the torque adjusting screw portion 103, the movable housing 500 is rotated together .

However, the fastening bolt (B) fixing the clutch housing (310) and the handle (100) integrally must tighten or loosen the slip torque adjusting bolt (600) in a released state.

When the slip torque is set by operating the slip torque adjusting bolt 600 in a state where the fastening bolts B are loosened, the holder member 200 and the one-way clutch 300, the fixed housing 400, (500) are all rotated together.

The first axial ball bearing 410 and the second axial ball bearing 510 of the present invention are arranged in the axial direction in which the tightening force of the torque limit driver D is applied as a key component for slip torque control of the rolling contact system The second axial ball bearing 510 may be moved in the axial direction to perform the slip rotary torque action. However, in the embodiment of the present invention, .

For example, the first slip ball 411 and the second slip ball 511 of the first and second axial ball bearings 410 and 510 are radially assembled to the respective retainers RT.

In the present invention, the retainer (RT) is formed to have a "C" shape so that the first slip ball 411 and the second slip ball 511 are rotatably supported in the groove space. For example, One side of the slip ball 411 and the second slip ball 511 protrude 1/3 from the opening side of the retainer RT and the other side of the slip ball 411 protrudes from the bottom of the retainer RT through a plurality of through- Holes 570 in the outer circumferential direction.

Accordingly, on the rear surface of the fixed housing 400 of the present invention and on the front surface of the movable housing 500, a plurality of protrusions (not shown) guiding the rolling of the first slip ball 411 and the second slip ball 511 The spherical slip groove 560 is formed radially.

The spherical slip groove 560 slidably contacts the spherical slip groove 560 when the first slip ball 411 and the second slip ball 511 rotate in a state of being mounted in the retainer RT, So as to guide the rotation of the first slip ball 411 and the second slip ball 511 while supporting the retainer RT against deformation or breakage of the retainer RT.

The first slip ball 411 and the second slip ball 511 are formed on the bottom surface of each retainer RT of the first and second axial ball bearings 410 and 510, And a matching protrusion 540 is formed on the rear surface of the fixed housing 400 and on the front surface of the movable housing 500 so as to be assembled corresponding to the matching hole 550.

According to such an assembling configuration, when the first and second axial ball bearings 410 and 510 are assembled to the fixed housing 400 and the movable housing 500, the clearance tolerance can be maintained, The first slip ball 411 and the second slip ball 511 are meshed with each other as gears are engaged with each other.

The mating protrusions 540 and the matching holes 550 prevent the slidable torque from being transmitted to the first and second axial ball bearings 410 and 550 while preventing the movable housing 500 from being idle during the slip torque operation. The slip rotational torque can be accurately transmitted to the second clutch 510, thereby providing a more accurate slip rotational torque.

In addition, in the present invention, the fitting tolerance between the first slip shaft 202 and the slip guide groove 501 maintains the intermediate fitting tolerance capable of slipping in the forward and backward directions, The tolerance between the inner diameters of the hollow portion 101 is made to maintain a loose fit tolerance.

According to this configuration, the first axial ball bearing 410 and the second axial ball bearing 510 are always coaxial with the holder member 200 and the fixed housing 400, .

Therefore, the second slip ball 511 comes into rolling contact with the first slip ball 411 without any twisting at the time of the slip-torque operation, thereby providing a more elaborate slip torque.

In addition, according to the present invention, the sealing cap further includes a concentric bearing (210) that is assembled to the outside of the holder member, so that the first and second axial ball bearings (410, 510) The concentric bearing (210) allows the screw tip mounted on the holder member (200), the fixed housing (400) and the holder member to rotate together with the handle while maintaining a concentric state so as to tighten the screw, So that the slip rotation by the rolling contact is achieved.

The present invention also provides a structure for discharging air between the first slip shaft 202 and the slip guide groove 501 in accordance with the linear movement of the movable housing 500 in the axial direction.

For example, the first slip shaft 202 and the slip guide groove 501 maintain the intermediate fitting tolerance in order to maintain the same concentricity. At this time, the first and second axial ball bearings 410 and 510 The movable housing 500 moves forward and backward in the axial direction.

Therefore, the internal air between the first slip shaft 202 and the slip guide groove 501 can not be smoothly discharged to the outside of the first slip shaft 202, and can be instantaneously evacuated.

Such a vacuum state may cause the back and forth movement to fail smoothly, such as a syringe and a piston structure, which may cause a failure of the slip torque operation of the movable housing 500.

Accordingly, in the present invention, as shown in FIGS. 5 and 6, the slip guide groove 501 is inserted into the hollow portion 101 through the fine gap formed by the loose fitting tolerance through the inside of the movable housing 500 And an air discharge path 580 which can be discharged is further formed.

When the movable housing 500 is moved back and forth in the axial direction by the air discharge passage 580, the internal air between the first slip shaft 202 and the slip guide groove 501 flows through the air discharge passage 580 So that it can escape to the outside of the movable housing 500 and can smoothly be discharged toward the hollow portion 101, so that the slip torque operation can be stably performed.

If the interior of the hollow portion 101 is sealed by the sealing cap 130 and the lock bolt 610 of the handle 100, the air that has escaped to the air discharge passage 580 is again discharged to the air discharge passage 580, And the air discharge path 580 may be formed in one or more than one depending on the internal air discharge amount.

A lock bolt 610 for preventing loosening of the slip torque adjusting bolt 600 is assembled to the torque adjusting screw portion 103 of the present invention and the torque adjusting screw portion 103 is provided behind the lock bolt 610, And a closure cap 620 for closing the cap 620.

The lock bolt 610 serves to prevent the set state of the slip torque adjusting bolt 600 from flowing after the slip torque adjusting bolt 600 is adjusted to set an appropriate slip torque.

The lock bolt 610 may be loosened by further assembling an unlocking washer (not shown) between the finishing cap 620 and the lock bolt 610

The lock bolt 610 also prevents external dust, moisture, fine foreign substances, etc. from flowing between the slip torque adjusting bolt 600 and the torque adjusting screw portion 103.

The locking bolt 610 may be integrally formed with a finishing cap 620 that is assembled outwardly. In order to improve grip feeling to the outside of the handle 100, when the injection material of the buffering material is injection molded by insert molding, So that it is prevented from being introduced into the hollow portion 101 at the same time.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Therefore, the scope of the present invention should not be limited by the described embodiments, but should be defined by the appended claims and equivalents thereof.

D: Torque limit screwdriver T: Screw tip
B: fastening bolt P: fastening pin
R: O-ring RT: retainer
100: Handle 101: Hollow portion
102: inlet 103: torque adjusting screw
130: sealing cap
200: holder member 201: mounting groove
202: first slip shaft 203: tip holder
203a: Overtravel 204: Ring spring
204a: incision section 204b: guide groove
205: Fixed ball 206: Tip detachable groove
210: Concentric retaining bearing
300: one-way clutch 310: clutch housing
400: fixed housing 410: first axial ball bearing
411: First slip ball
500: movable housing 501: slip guide groove
510: second axial ball bearing 511: second slip ball
520: second slip shaft 530: elastic member
540: matching protrusion 550: matching hole
560: Spherical slip groove 570: Through hole
580: Air exhaust path
600: Slip torque adjusting bolt 601: Slip adjusting hole
610: Lock bolt 620: Finishing cap

Claims (9)

A handle having a hollow portion penetrating the inside thereof and having a torque adjusting screw portion for adjusting the torque from an inlet to a rear inner circumferential surface thereof;
A shaft-shaped holder member having a first slip shaft, which is assembled to the inlet of the hollow portion to be rotated together with the handle,
A one-way clutch assembled to the inside of the hollow portion by being assembled to the holder member so as to transmit the rotational force only in the screwing direction of the holder member;
A fixed housing fitted to an outer side of the holder member and fixed to be integral with the handle;
A first axial ball bearing mounted on the rear side of the fixed housing and having a plurality of first slip balls radially arranged on a rear surface thereof;
Wherein the first slip shaft is rotatably assembled in a slip guide groove formed in the center and a second slip shaft is formed on the rear surface so that the first slip shaft is axially movably joined to the shaft, A movable housing;
A second axial ball bearing mounted on the front side of the movable housing and having a plurality of second slip balls engaged with the first slip balls of the first axial ball bearing and in rolling contact with the rotational torque of the handle; And
Wherein the first slip ball is screwed to the torque adjusting screw and is axially movably coupled with the second slip shaft so as to adjust a pressing force of the elastic member, And a slip torque adjusting bolt for adjusting a slip torque obtained when the swing arm is in rolling contact with the slip torque adjusting bolt.
The method according to claim 1,
The first slip ball and the second slip ball are assembled to the respective retainers of the first and second axial ball bearings, one side of which protrudes 1/3 toward the open side of the retainer, And is protruded to the outside through a through-hole formed by about 1/3,
Wherein a plurality of spherical slip grooves are radially formed on the rear surface of the stationary housing and on the front surface of the movable housing to guide the rotation of the first slip ball and the second slip ball protruding to the outside, Torque limit driver with function.
The method according to claim 1,
The first and second axial ball bearings are provided on the respective retainer bottom surfaces of the first and second axial ball bearings
A matching hole is formed between the first slip ball and the second slip ball,
And a matching protrusion is formed on the rear surface of the fixed housing and on the front surface of the movable housing to correspond to the matching hole.
The method according to claim 1,
Wherein the fitting tolerance between the first slip shaft and the slip guide groove maintains an intermediate fitting tolerance capable of slipping in the rotation and forward and backward directions and the tolerance between the inner diameter of the movable housing and the inner diameter of the hollow portion maintains a loose fitting tolerance, Wherein the first axial ball bearing and the second axial ball bearing are concentric with the holder member and the fixed housing, and slip rotation is performed by rolling contact.
5. The method of claim 4,
And a second slip guide groove formed in the first slip guide groove and extending in the axial direction of the movable housing, And a plurality of air discharge paths are formed in the outer circumferential surface of the torque limiting screw.
The method according to claim 1,
Wherein the locking bolt is assembled to the torque adjusting screw portion to prevent the slip torque adjusting bolt from being loosened and the locking bolt is screwed to the rear of the locking bolt to close the torque adjusting screw portion. Torque limit driver with torque regulation function.
The method according to claim 1,
Further comprising a concentric bearing which is mounted on the inside of the sealing cap to be assembled outside the holder member.
The method according to claim 1,
And a tip holder having a mounting groove formed at the front of the holder member, a rear end portion of which is screwed into the mounting groove, and a tip attachment / detachment groove which can be used by replacing various types of screw tips at the distal end portion. A torque limit driver with a rolling contact slip torque control function.

The method according to claim 1,
And the screw tip is integrally formed at the tip end portion of the holder member.

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