CN113172576B

CN113172576B - Preset torque wrench with rear reading

Info

Publication number: CN113172576B
Application number: CN202110329386.0A
Authority: CN
Inventors: 曾琦; 李桂珍
Original assignee: Hangzhou Bellina Tools Co ltd
Current assignee: Hangzhou Bellina Tools Co ltd
Priority date: 2021-03-28
Filing date: 2021-03-28
Publication date: 2022-05-27
Anticipated expiration: 2041-03-28
Also published as: CN113172576A

Abstract

The invention relates to the technical field of hand tools, in particular to a preset torque wrench with a rear reading function, which comprises a handle, a working head, a connector, an inner rod, a stressing rod, a spring, a top ring, a thimble, a roller, a scale ring, a force bearing pin and a butting ring. The substantial effects of the invention are as follows: the preset torque is set through the rear force applying rod, the handle and the handle are fixed, the locking nut is omitted, and the efficiency is improved.

Description

Preset torque wrench with rear reading

Technical Field

The invention relates to the technical field of hand tools, in particular to a preset torque wrench with a rear reading function.

Background

When the screw fasteners such as screws, bolts, nuts and the like are fastened, the applied torque needs to be controlled so as to ensure that the screw fastening is realized, the thread is not damaged due to overlarge torque, and the thread is ensured to be sufficiently fastened. The preset torque wrench has a preset torque value and an audible device. When the torque reaches the set value, the wrench can make a sound and simultaneously feel vibration, which represents that the wrench is fastened and does not apply any force. However, the torque of the existing torque wrench is set by rotating the handle, and after the torque is set, the lock nut needs to be screwed down again, so that the problem that the handle rotates when the nut is screwed down to apply force and the use is inconvenient is solved.

Chinese patent CN211439727U describes a preset torque wrench, including the bung, the upper surface of bung is provided with the head of screwing, put the stand, establish the stop collar cover on the stand, then press from both sides the head of screwing on the tight bung by the spanner chuck clamp, place handle and spanner chuck horizontal direction, begin to rotate the handle clockwise and screw the head of screwing through the spanner chuck, when handle pivoted in-process, use down through the cooperation of first connecting rod and second connecting rod, drive articulated seat and sliding sleeve and slide right on the dead lever, touch the metal block and send out the sound when the metal ball, the inside of draw-in groove is gone into to the card gradually to the fixture block, set up like this for just-in torque, need not the twist grip again. Above-mentioned technical scheme still can not solve the handle and need possess the application of force and screw up and awkward problem after locking with the help of lock nut.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the current torque wrench is inconvenient to use. A preset torque wrench with a rear reading is provided.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a preset torque wrench with rear reading comprises a handle, a working head, a connector, an inner rod, a force applying rod, a spring, a top ring, a thimble, a roller, a scale ring, a force bearing pin and a butting ring, wherein the connector is rotationally connected with the working head, the butting ring is fixedly connected with the connector, the force bearing pin is fixedly connected with the front end of the inner rod, grooves matched with the force bearing pin are uniformly distributed on the butting ring along the circumferential direction, the working head is rotationally connected with the front portion of the inner rod, when the inner rod rotates towards one direction relative to the butting ring, the force bearing pin is tightly butted against the grooves, the rotational axes of the inner rod and the working head are marked as a first axis, the axis of the force bearing pin is marked as a second axis, the first axis and the second axis are parallel, and the intersection line of the connecting surface of the first axis and the second axis and the grooves is positioned in the contact range of the grooves and the force bearing pin, when the inner rod rotates in the opposite direction relative to the butt ring, the bearing pin is separated from the butt ring, the connector is used for connecting a fastened piece, the handle is hollow, the inner rod extends into the handle, the handle is rotatably connected with the inner rod, the roller is rotatably connected with the tail of the inner rod, the top ring and the spring are sleeved in the hollow part of the handle, the top ring is provided with a thimble, the thimble is abutted to the roller, the tail of the handle is provided with an internal thread, the stressing rod is provided with an external thread part matched with the internal thread, the scale ring is arranged on the stressing rod, and the spring is positioned between the stressing rod and the top ring. Because of unavoidable assembly errors, a small amount of movement of the force bearing pin and the abutting ring relative to the theoretical position can occur, and the small amount of movement can be decomposed into relative rotation and relative translation. Because the force bearing pin is in arc surface contact with the abutting ring, relative rotation in the force bearing pin does not influence the contact surface. The relative translation can be eliminated through the relative angle of the inner rod and the working head, so that the structure can eliminate the problem that the contact surface is reduced due to assembly errors, and the structure has the beneficial effect that a right-angle pawl adopted in the prior art does not have. In the prior art, if the relative position of the pawl and the ratchet wheel changes, for example, the distance slightly increases, the contact surface of the pawl and the ratchet wheel changes from surface contact to line contact.

As preferred, still include the reading ring, the scale ring rotates to cup joint and is in on the stress application pole, scale ring outer wall processing is fluted, install on hand with the lug of recess joint, reading ring fixed mounting is at the handle tail end, processing has reading line and reading groove on the reading ring, the reading line is used for instructing the scale on the scale ring, the reading groove is used for exposing the reading on the scale ring.

Preferably, the top ring is provided with two ejector pins, and the two ejector pins are abutted to the roller.

Preferably, the tail part of the stressing rod is fixedly connected with a hand wheel.

Preferably, the handle is further provided with a grab handle, and the grab handle is fixedly connected with the rear part of the handle.

Preferably, the handle is rotatably connected to the inner lever by a first pin. The second pin is used for connecting the inner rod and the working head.

Preferably, the connector is fixedly connected with the working head through a connecting pin.

Preferably, a plug is fixedly mounted at the front end of the working head.

The substantial effects of the invention are as follows: in the device, the preset torque is set through the rear force applying rod, and the rear part of the handle or the handle is fixed, so that a lock nut is omitted, the device can be directly used for screwing the nut after the torque is set, the torque setting efficiency can be improved, and the efficiency of screwing a fastened piece is improved; the bearing pin direct fixed mounting that this device provided has very high joint strength with interior pole on interior pole, and the pawl that adopts among the prior art is the pivoted swing joint with interior pole, and the bearing capacity receives certain restriction, therefore this device has improved the moment of torsion upper limit that torque wrench can bear under the similar size, has improved torque wrench's bearing capacity.

Drawings

FIG. 1 is a schematic view of a torque wrench according to an embodiment.

FIG. 2 is a cross-sectional view of a torque wrench according to an embodiment.

FIG. 3 is a schematic top view of a torque wrench according to an embodiment.

FIG. 4 is a schematic view of an embodiment of a torque wrench roller installation.

FIG. 5 is a schematic diagram of a torque wrench according to an embodiment to achieve a predetermined torque roller position.

FIG. 6 is a schematic view of a torque wrench working head according to an embodiment.

FIG. 7 is a schematic view of an embodiment of a torque wrench abutment ring structure.

Fig. 8 is a schematic view of the embodiment of a torque wrench carrier pin and abutment ring fit.

FIG. 9 is a schematic view of a torque wrench according to an embodiment of the present invention.

Wherein: 1. the hand wheel comprises a hand wheel body 2, a scale ring 3, a grab handle 4, a handle 5, a working head 6, a first pin 7, a second pin 8, a connector 9, a connecting pin 10, a stress application rod 11, a reading ring 12, a spring 13, a top ring 14, a roller 15, an inner rod 16, a plug 17, a thimble 18, a bearing pin 19 and a butting ring.

Detailed Description

The following provides a more detailed description of the present invention, with reference to the accompanying drawings.

The first embodiment is as follows:

a preset torque wrench with rear reading is disclosed, please refer to fig. 1, fig. 2 and fig. 3, the embodiment includes a handle 4, a working head 5, a connector 8, an inner rod 15, a force applying rod 10, a spring 12, a top ring 13, a thimble 17, a roller 14, a scale ring 2, a force applying pin 18 and a butting ring 19, the connector 8 is rotatably connected with the working head 5, the connector 8 is used for connecting a fastened piece, the handle 4 is hollow, the inner rod 15 extends into the handle 4, the handle 4 is rotatably connected with the inner rod 15, the roller 14 is rotatably connected with the tail of the inner rod 15, the top ring 13 and the spring 12 are both sleeved in the hollow of the handle 4, the thimble 17 is mounted on the top ring 13, the thimble 17 is butted with the roller 14, the tail of the handle 4 is processed with an internal thread, the force applying rod 10 is processed with an external thread part matched with the internal thread, the scale ring 2 is mounted on the force applying rod 10, the spring 12 is positioned between the force applying rod 10 and the top ring 13, please refer to fig. 6 and fig. 7, the abutting ring 19 is fixedly connected with the connector 8, the force bearing pins 18 are fixedly connected with the front end of the inner rod 15, grooves matched with the force bearing pins 18 are evenly distributed on the abutting ring 19 along the circumferential direction, and the working head 5 is rotatably connected with the front portion of the inner rod 15. Referring to fig. 8, when the inner rod 15 rotates in one direction relative to the abutting ring 19, the force bearing pin 18 abuts against the groove, the rotation axis of the inner rod 15 and the working head 5 is marked as a first axis, the axis of the force bearing pin 18 is marked as a second axis, the first axis is parallel to the second axis, and the intersection line of the connecting surface of the first axis and the second axis and the groove is located in the contact range of the groove and the force bearing pin 18. The acting force F of the abutting ring 19 on the bearing pin 18 is decomposed into two forces, namely Fs and Fg, wherein Fs is vertical to Fs along the direction of the bearing pin 18 and the second pin 7, and Fg enables the bearing pin 18 to tightly press the abutting ring 19, so that self-locking is formed, and the relative positions of the bearing pin 18 and the abutting ring 19 cannot be changed. Referring to fig. 9, when the inner rod 15 rotates in the opposite direction relative to the abutting ring 19, the force-bearing pin 18 is separated from the abutting ring 19, the scale ring 2 rotates and is sleeved on the force-applying rod 10, a groove is formed in the outer wall of the scale ring 2, a protruding block clamped with the groove is mounted on the handle 4, the reading ring 11 is fixedly mounted at the tail end of the handle 4, a reading line and a reading groove are formed in the reading ring 11, the reading line is used for indicating the scale on the scale ring 2, and the reading groove is used for exposing the reading on the scale ring 2. Referring to fig. 4, two ejector pins 17 are mounted on the top ring 13, and both ejector pins 17 are abutted against the roller 14. The tail part of the stress application rod 10 is fixedly connected with a hand wheel 1. The grab handle 3 is fixedly connected with the rear part of the handle 4. The handle 4 is pivotally connected to the inner lever 15 by means of a first pin 6. The second pin 7 is used to connect the inner rod 15 and the working head 5. The connector 8 is fixedly connected with the working head 5 through a connecting pin 9. The front end of the working head 5 is fixedly provided with a plug 16.

The working mode of the embodiment is as follows: the force applying rod 10 is rotated to a required position according to the scale, the force applying rod 10 extrudes the spring 12, the spring 12 contracts to generate pressing force and acts on the top ring 13, the top ring 13 acts on the roller 14 through the ejector pin 17, then the connector 8 is connected with a screwed part, force is applied through the handle 4, when the reaction force generated by the screwed part reaches a preset value, the inner rod 15 drives the roller 14 to rotate by overcoming the pressing force of the ejector pin 17, the inner rod 15 can impact the inner wall of the handle 4 when rotating, sound and vibration are generated, and the preset torque is prompted to be reached. The inner rod 15 hits the inner wall of the handle 4, see fig. 5. After the force application is stopped, the parts are restored to the positions under the action of the spring 12. To protect the spring 12, the lever 10 is unscrewed to not compress the spring 12, and then the torque wrench is received.

The process that the handle can be pulled in a reciprocating manner without dismantling the connection is realized in the embodiment as follows: when pulling handle 4 right, can make bearing round pin 18 compress tightly butt ring 19, butt ring 19 can drive connector 8 this moment, make connector 8 drive by screwing up a rotation, realize by the rotation of screwing up the piece, when reverse pulling handle 4, bearing round pin 18 breaks away from butt ring 19, can free rotation relatively between butt ring 19 and the handle 4 this moment, thereby can adjust the handle 4 angle by screwing up the piece relatively, needn't break away from the contact with connector 8 and by screwing up a and can return positive handle 4, play the effect of similar ratchet pawl, accelerate the speed by screwing up a fastening.

The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.

Claims

1. A preset torque wrench with a rear reading, which is characterized in that,

comprises a handle, a working head, a connector, an inner rod, a stress application rod, a spring, a top ring, a thimble, a roller, a scale ring, a force bearing pin and a butting ring,

the connecting head is rotatably connected with the working head, the abutting ring is fixedly connected with the connecting head, the force bearing pin is fixedly connected with the front end of the inner rod, grooves matched with the force bearing pin are uniformly distributed in the circumferential direction of the abutting ring, the working head is rotatably connected with the front portion of the inner rod, when the inner rod rotates in one direction relative to the abutting ring, the force bearing pin abuts against the grooves tightly, the rotating axes of the inner rod and the working head are marked as a first axis, the axis of the force bearing pin is marked as a second axis, the first axis and the second axis are parallel, the intersection line of the connecting surface of the first axis and the second axis and the groove is positioned in the contact range of the grooves and the force bearing pin, when the inner rod rotates in the opposite direction relative to the abutting ring, the force bearing pin is separated from the abutting ring, the connecting head is used for connecting a fastened piece, the handle is hollow, and the inner rod extends into the handle, the handle is rotatably connected with the inner rod, the idler wheel is rotatably connected with the tail of the inner rod, the top ring and the spring are sleeved in the hollow of the handle, the ejector pin is installed on the top ring and abutted against the idler wheel, an internal thread is processed on the tail of the handle, the force application rod is processed with an external thread part matched with the internal thread, the scale ring is installed on the force application rod, and the spring is located between the force application rod and the top ring.

2. The preset torque wrench with a back reading according to claim 1,

still include the reading ring, the scale ring rotates to cup joint on the application of force pole, scale ring outer wall processing is fluted, on hand install with the lug of recess joint, reading ring fixed mounting is at handle tail end, processing has reading line and reading groove on the reading ring, the reading line is used for instructing the scale on the scale ring, the reading groove is used for exposing the reading on the scale ring.

3. A postpositioned torque wrench according to claim 1 or 2,

two ejector pins are mounted on the top ring and are abutted to the roller.

4. A postpositioned torque wrench according to claim 1 or 2,

the tail of the stress application rod is fixedly connected with a hand wheel.

5. A postpositioned torque wrench according to claim 1 or 2,

the handle is fixedly connected with the rear part of the handle.

6. A postpositioned torque wrench according to claim 1 or 2,

the handle is rotatably connected with the inner rod through a first pin; the second pin is used for connecting the inner rod and the working head;

the connector is fixedly connected with the working head through a connecting pin.