CN213946273U

CN213946273U - Force limiting spanner

Info

Publication number: CN213946273U
Application number: CN202022286346.6U
Authority: CN
Inventors: ***; 关德荣
Original assignee: Foshan Coxo Medical Instrument Co ltd
Current assignee: Foshan Coxo Medical Instrument Co ltd
Priority date: 2020-10-14
Filing date: 2020-10-14
Publication date: 2021-08-13
Anticipated expiration: 2030-10-14

Abstract

The utility model discloses a torque wrench. Relates to medical equipment, in particular to a force limiting wrench for ultrasonic medical equipment. The force limiting wrench is simple in structure and obvious in feedback when the peak torque force is reached. The device comprises a shell, a fixed sleeve, a rotating wheel and an elastic clamp, wherein the fixed sleeve is arranged in the shell, a sinking platform is arranged in the middle of the fixed sleeve, the rotating wheel is arranged on the end surface of the sinking platform, and the rotating wheel rotates in the sinking platform; when the rolling member reaches the tail end of the protruding portion from the side wall of the rotating wheel, the torsion is reduced, crisp collision sound can be generated between the rolling member and the rotating wheel, so that feedback information is provided for a user, when the rolling member is unscrewed in place, the rolling member rotates to the position of the groove and is blocked by the position of the groove, the steel ball is positioned in the groove, the force required by screwing is extremely large at the moment, the torsion is reduced sharply until the force is larger than the locking force, namely, a hand feeling prompt is given after the rolling member is unscrewed in place, and the feedback is obvious.

Description

Force limiting spanner

Technical Field

The utility model relates to a medical equipment especially relates to an supersound is torque wrench for medical equipment.

Background

If the tightening degrees of the working tips of the ultrasonic medical equipment are different, the resonance frequency of the working tips can be influenced, and the consistency of vibration effects cannot be ensured, so that the effect of the force limiting wrench is particularly important.

The current limit spanner, when reaching peak value torsion and skidding, the user can not obtain an effectual feedback, for example chinese utility model patent of publication No. CN207104786U, wherein limit spanner utilizes spring force and causes to produce frictional force between shell and the inside lining, when the shell turning force is greater than frictional force, then take place idle running limit power, but this process, the user only feels can screw down always, hardly knows limited power locking, can not obtain an effectual feedback.

For example, chinese utility model patent publication No. CN202498483U, wherein the force limiting effect is formed by the cooperation of the ratchet wheel and the friction force of the ratchet wheel hole, when this kind of scheme reaches the peak torque force, although there is also sound feedback, the ratchet wheel of this kind of structure, the molding is complicated, and after the ratchet wheel is used for a long time, the ratchet wheel claw may break, or deform to a certain extent, thereby influencing the maximum locking force.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model provides a simple structure, the obvious limit force spanner of feedback when reaching peak torque force.

The utility model discloses a following technical scheme realizes: a force-limiting wrench comprises a shell, a fixed sleeve, a rotating wheel and an elastic clamp, wherein the fixed sleeve is arranged in the shell, a sinking platform is arranged in the middle of the fixed sleeve, the rotating wheel is arranged on the end face of the sinking platform, and the rotating wheel rotates in the sinking platform;

a through hole is formed in the inner wall of the fixed sleeve, a rolling part is placed in the through hole, the elastic clamp is placed between the rolling part and the outer shell, and the rolling part is pressed in the through hole to be in contact with the side wall of the rotating wheel;

the middle of the upper end face of the rotating wheel is provided with a rectangular through hole, the rectangular through hole is sleeved with a working tip, the outer edge of the rotating wheel is provided with a protruding portion protruding outwards, and the protruding portion works as the rolling piece winds the rotating wheel and pushes the rolling piece to move in the direction of the elastic clamp.

The force limiting wrench further comprises a limiting part, and the limiting part is transversely arranged between the elastic clamp and the fixed sleeve.

The locating part includes the cotter pin, the one end of cotter pin is inserted in the bullet card, the other end of cotter pin is inserted in the fixed cover.

The fixing sleeve is provided with a fixing sleeve flat position, the shell is provided with a shell flat position, and the fixing sleeve flat position and the shell flat position are matched with each other, so that the fixing sleeve and the shell are still relatively all the time, and the shell drives the fixing sleeve to rotate.

The runner is provided with a runner sinking platform, the runner sinking platform is provided with bolt holes, and the rectangular through holes are formed in the runner sinking platform.

The rotating wheel sinking platform is provided with an elastic sheet, the elastic sheet is wound around the rectangular through hole, and the end part of the working tip is clamped by the elastic sheet when the working tip is inserted into the rectangular through hole.

The cover plate is arranged on the upper end face of the shell, the cover plate covers the shell, the cover plate is fixed to the shell through threaded connection, a through hole is formed in the cover plate, and the through hole is formed right above the rectangular through hole.

Compared with the prior art, the utility model discloses when well rolling member reachs the terminal position of protruding portion from the position of the lateral wall of runner, torsion reduces suddenly, the rolling member is under the effect of bullet card, during the recess position that the protruding portion that gets into in the twinkling of an eye has the drop to form, clear fragile collision sound can take place for rolling member and runner, thereby give feedback information of user, hear sound proof and have limited power and screwed up, and when unscrewing, the position of rolling member antiport to the recess, be blockked by the recess position, make the dynamics of continuously twisting last grow, be greater than the locking force until the dynamics, screw thread department is unscrewed, the bullet card can not be moved in the outer fringe can not top, thereby torsion suddenly reduces in the twinkling of an eye, thereby give the suggestion on the user feels, the feedback is obvious.

Drawings

FIG. 1 is an exploded view of the structure of the present invention;

FIG. 2 is a sectional view of the internal structure of the present invention;

FIG. 3 is a schematic diagram of the screwing mechanism of the present invention;

in the figure: 1. a cover plate; 11. a through hole; 2. snapping; 3. a rotating wheel; 31. a rectangular via hole; 32. a rotating wheel sinking platform; 33. an outer edge; 34. a protrusion; 35. a groove; 4. fixing a sleeve; 41. fixing the flat position of the sleeve; 5. a rolling member; 6. blocking pins; 7. a housing; 71. the shell is flat.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that the embodiments or technical features described below can be arbitrarily combined to form a new embodiment without conflict.

As shown in fig. 1-3, a force-limiting wrench comprises a housing 7, a fixed sleeve 4, a rotating wheel 3 and an elastic clip 2, wherein the fixed sleeve 4 is arranged in the housing 7, a sinking platform is arranged in the middle of the fixed sleeve 4, the rotating wheel 3 is arranged on the end surface of the sinking platform, and the rotating wheel 3 rotates in the sinking platform; a through hole is formed in the inner wall of the fixed sleeve 4, a rolling part 5 is placed in the through hole, the rolling part 5 can be a steel ball or a cylindrical pin, the elastic clamp 2 is placed between the rolling part 5 and the outer shell 7, and the rolling part 5 is pressed in the through hole to be in contact with the side wall of the rotating wheel 3; the middle of the upper end face of the rotating wheel 3 is provided with a rectangular through hole 31 which is sleeved with a working tip, the outer edge of the rotating wheel 3 is provided with a protruding part 34 protruding outwards, and the protruding part 34 works as the rolling part 5 winds the rotating wheel 3 and pushes the rolling part 5 to move towards the direction of the elastic card 2.

Taking the rolling element as an example of the steel ball, the working state of the force limiting wrench during screwing is specifically described, when the force limiting wrench screws the working tip (i.e. the tip of the ultrasonic medical instrument, which can be generally detached from the ultrasonic hand-held instrument), the force acts on the surface of the shell 7 clockwise, the shell 7 and the fixing sleeve 4 are relatively static, and the fixing sleeve 4 and the steel ball are relatively static, i.e. the steel ball moves with the shell 7 at the same angular velocity. The wheel 3 and the tip are always relatively stationary and the tip is in rotational motion relative to the tool before the tip is screwed down on the tool. The rotating wheel 3 is taken as a reference object, the steel ball moves clockwise in the clockwise screwing process, when the steel ball is positioned at the position of the outer edge 33, the steel ball is continuously screwed, the steel ball is extruded by the protruding part 34 of the rotating wheel 3 to move outwards, the more pretightening force applied to the steel ball by the elastic clamp 2 is, and the larger torsion force is transmitted to the working tip; the torsion force N1 peaks instantaneously when the steel ball is at the start end position of the protrusion 34. If the steel ball continues to be screwed, the steel ball falls to the next position at the outer edge 33, namely the position of the starting end of the next protruding part and the tail end of the previous protruding part 34, so that the steel ball is not extruded by the previous protruding part 34 and does not reach the starting position of the next protruding part 34, the torsion of the steel ball at the position is suddenly reduced, the steel ball collides with the outer edge 33 to generate collision sound, the steel ball continues to rotate, and the previous stress change is repeated.

When the working tip of the limited wrench is unscrewed, the rolling member rotates counterclockwise relative to the rotating wheel, but because the rolling member moves to the section of the outer edge and the protrusion, the position is formed with the groove 35, the resistance encountered by the steel ball is larger, if the steel ball needs to continue to move relative to the rotating wheel 3, the steel ball needs to apply a torsion N2 larger than the torsion N1 to realize the rotation, the torsion when the working tip is screwed is N1, the corresponding force for unscrewing the working tip is still about N1 (i.e. the torsion when unscrewing should be equal to the maximum torsion N1 when screwing), and the torsion when unscrewing is far smaller than the torsion N2. Therefore, when the tip is unscrewed, the ball becomes relatively stationary as it moves relative to the wheel 3 to the position of the recess 35. That is to say, after the screw is screwed in place, the torque force during screwing is sharply reduced from N1, if the screw is still screwed continuously, the torque force is repeatedly increased to N1 and then sharply reduced again, the process is repeated, a clear hand feeling prompt is given during screwing, when the screw is unscrewed, the steel ball is positioned in the groove 35, the force required by screwing is extremely large at the moment, until the force is greater than the locking force, the torque force is sharply reduced, that is to say, the hand feeling prompt is given after the screw is unscrewed in place, and the feedback is obvious.

When the rolling part 5 reaches the position of the tail end of the protruding part 34 from the position of the side wall of the rotating wheel 3, the torsion is reduced suddenly, the rolling part 5 enters the position of the groove 35 formed by the protruding part 34 with the fall instantly under the action of the elastic card 2, crisp collision sound can be generated between the rolling part 5 and the rotating wheel 3, so that feedback information is provided for a user, the sound is heard to prove that the force is limited and screwed well, when the rolling part 5 is unscrewed in place, the rolling part 5 rotates to the position of the groove 35 and is blocked by the position of the groove 5, the force for continuously screwing is continuously increased until the force is larger than the locking force, the back torsion is reduced sharply, and the feedback is obvious for the prompt on the hand feeling of the user.

The force limiting wrench further includes a limiting member, which may be a plug pin 6, or a member capable of being transversely disposed between the elastic clip 5 and the fixing sleeve 4, such as a bolt, and the following description specifically takes the limiting member as the plug pin 6 as an example.

The blocking pin 6 is transversely arranged between the elastic card 5 and the fixed sleeve 4 and used for limiting the rotation position of the elastic card. One end of the blocking pin 6 is inserted into the opening of the elastic card 5, and the other end of the blocking pin 6 is inserted into the fixed sleeve 4. The blocking pin 6 is used for rotationally positioning the elastic card 2, so that the situation that the opening of the elastic card 5 rotates to the position of the rolling piece 5 to influence the use is avoided.

The device is characterized in that a fixed sleeve flat position 41 is arranged on the fixed sleeve 4, a shell flat position 71 is arranged on the shell 7, and the fixed sleeve flat position 41 and the shell flat position 71 are matched with each other to indicate the rotation angle between the fixed sleeve 4 and the shell 7. The fixed sleeve flat part 41 is matched with the shell flat part 71 to realize the positioning in the rotating direction.

The runner 3 is provided with a runner sinking platform 32, the runner sinking platform 32 is provided with bolt holes, and the rectangular via holes 31 are arranged on the runner sinking platform. The rotating wheel sinking platform 31 is provided with an elastic sheet, the elastic sheet is fixed in a bolt hole through a bolt and wound around the rectangular through hole, the elastic sheet is used for clamping the end part of the working tip when the working tip is inserted into the rectangular through hole 31, if the used working tip is thick, for example, the working tip used by a tooth cleaner or a bone knife, and when the working tip is screwed out, the elastic sheet plays a role of clamping the working tip to prevent the working tip from falling.

Be equipped with apron 1 on the up end of shell 7, apron 1 lid closes on the shell 7 just apron 1 is fixed through threaded connection on the shell 7, be equipped with through-hole 11 on the apron 1, through-hole 11 is located directly over the rectangle via hole. The through hole 11 in the middle of the cover plate 1 is in a cross-shaped groove structure and is used for assembly. The hole in the center of the through hole 11 is smaller than the rectangular through hole 31, so that the working tip can only penetrate through the through hole from the lower side and is clamped to the flat position of the working tip, and if the working tip penetrates through the through hole 11 from the upper side, the flat position of the working tip is larger than the hole, and the flat position of the working tip cannot reach the rectangular through hole 31, so that torsion cannot be clamped and transferred, and the fool-proof effect is achieved.

In this scheme, the torque wrench can carry out reasonable and effectual control to the dynamics of loading and unloading work point, and stable in structure is reliable, long service life, and the user uses and experiences well. When the rolling piece 5 reaches the position of the tail end of the protruding part 34 from the position of the side wall of the rotating wheel 3, the torsion is reduced suddenly, the rolling piece 5 enters the position of the groove 35 formed by the protruding part 34 with the fall instantly under the action of the elastic card 2, the rolling piece 5 and the rotating wheel 3 can generate crisp collision sound, so that feedback information is provided for a user, the sound is heard to prove that the force is limited to be screwed, and when the rolling piece 5 is unscrewed, the rolling piece 5 rotates to the position of the groove 35 and is blocked by the position of the groove 5, so that the screwing force is continuously increased until the screwing force is larger than the locking force, the torsion is loosened, and the torsion is reduced sharply, so that the feedback is obvious for the user to feel prompt.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.

Claims

1. The utility model provides a torque wrench, includes shell, fixed cover, runner and bullet card, its characterized in that: the fixed sleeve is arranged in the shell, a sinking platform is arranged in the middle of the fixed sleeve, a rotating wheel is arranged on the end face of the sinking platform, and the rotating wheel rotates in the sinking platform;

2. A torque wrench as claimed in claim 1, wherein: the force limiting wrench further comprises a limiting part, and the limiting part is transversely arranged between the elastic clamp and the fixed sleeve.

3. A torque wrench as claimed in claim 2, wherein: the locating part includes the cotter pin, the one end of cotter pin is inserted in the opening of bullet card, the other end of cotter pin is inserted in the fixed cover.

4. A torque wrench as claimed in claim 1, wherein: the fixing sleeve is provided with a fixing sleeve flat position, the shell is provided with a shell flat position, and the fixing sleeve flat position and the shell flat position are matched with each other, so that the fixing sleeve and the shell are still relatively all the time, and the shell drives the fixing sleeve to rotate.

5. A torque wrench as claimed in claim 1, wherein: the runner is provided with a runner sinking platform, the runner sinking platform is provided with bolt holes, and the rectangular through holes are formed in the runner sinking platform.

6. A torque wrench as claimed in claim 5, wherein: the rotating wheel sinking platform is provided with an elastic sheet, the elastic sheet is wound around the rectangular through hole, and the end part of the working tip is clamped by the elastic sheet when the working tip is inserted into the rectangular through hole.

7. A torque wrench as claimed in claim 1, wherein: the cover plate is arranged on the upper end face of the shell, the cover plate covers the shell, the cover plate is fixed to the shell through threaded connection, a through hole is formed in the cover plate, and the through hole is formed right above the rectangular through hole.

8. A torque wrench as claimed in claim 1, wherein: the rolling piece is a steel ball or a cylindrical pin.