CN112792774A

CN112792774A - Preset torque wrench of postposition hand wheel

Info

Publication number: CN112792774A
Application number: CN202110113479.XA
Authority: CN
Inventors: 曾琦; 李桂珍
Original assignee: Hangzhou Bellina Tools Co ltd
Current assignee: Hangzhou Bellina Tools Co ltd
Priority date: 2021-01-27
Filing date: 2021-01-27
Publication date: 2021-05-14
Anticipated expiration: 2041-01-27
Also published as: CN112792774B

Abstract

The invention relates to the technical field of manual tools, in particular to a preset torque wrench with a rear hand wheel, which comprises a handle, a working head, a connector, a hand wheel, a plug, a screw rod, a sleeve, a pointer, a spring, a top ring, a roller, a lever, a pin and a force bearing pin, wherein two ends of the force bearing pin are processed into hemispherical surfaces, two ends of the force bearing pin are abutted against the inner wall of the working head, the middle part of the connector is rotatably connected with a working hole, the front part of the lever is abutted against the upper part of the connector, the roller is rotatably arranged at the front part of the top ring, the rear part of the lever is abutted against the roller, the rear part of the top ring is abutted against the spring, the middle part of the handle is processed with a pointer groove, the pointer is clamped into the pointer groove, the rear part of the. The substantial effects of the invention are as follows: a stress application sleeve rod is omitted, torque is set through a rear hand wheel, the stress application sleeve rod does not need to be locked after the torque is set, and the torque setting efficiency is improved.

Description

Preset torque wrench of postposition hand wheel

Technical Field

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

Background

The torque is the product of force and distance, and the torque applied needs to be controlled when fastening threaded fasteners such as screws, bolts, nuts and the like so as to ensure that the threads are fastened without damaging the threads due to overlarge torque and ensure that the threads are sufficiently fastened, so that the torque wrench is used for operating. The preset torque wrench has a preset torque value and an audible device. When the torque-limiting device is used, a required upper limit of a torque value is set, when the applied torque reaches a set value, the wrench can make a sound of clamping a tower or bend a certain angle at the connection part of the wrench, and the obvious hand feeling vibration is accompanied, so that the situation that the torque-limiting device is fastened and no force is applied is provided, and the completion of work is prompted. After the acting force is relieved, all related parts of the wrench can be automatically reset. Chinese patent CN109866154A describes a torque wrench, including wrench head, wrench rod and afterburning loop bar, afterburning loop bar is the cavity casing, and the upper end is equipped with connecting groove, and wrench head and wrench rod are overall structure, and wrench head's lower extreme necking down department is equipped with the boss, and wrench rod's connecting groove and wrench head's boss face counterbalance lean on, and wrench rod and afterburning loop bar pass through rotation axis swing joint together, still are equipped with steel ball and spring in the afterburning loop bar, and wrench rod's lower extreme is equipped with the scarf, scarf and the scarf is with steel ball surface looks butt, and the lower extreme of steel ball is connected with the spring, and the lower extreme connection of spring is adjusted the jackscrew, adjusts the jackscrew and afterburning loop bar's lower extreme inner wall threaded connection. When the wrench is used, the nut is stretched into a bayonet in the wrench head, the stress application sleeve rod is twisted, when a set torque value is reached, the steel balls touch the inner wall of the stress application sleeve rod and send out clear alarm sound, vibration can be sensed on the stress application sleeve rod, and at the moment, locking can be stopped.

The technical scheme has the following problems: (1) after the stress application sleeve rod is twisted, the stress application sleeve rod needs to be locked for use, so that the stress application sleeve rod is prevented from sliding in the use process, the torque setting steps are multiple, and the efficiency is low; (2) although the thread pair between the stress application sleeve rod and the handle is reduced, the preset torque is still relatively laborious in the actual use process; (3) and for the purpose of protecting the spring, after each use, the stress application loop bar needs to be restored to the initial state, namely no force is applied, so that the torque is almost set once for each use, and the working efficiency is influenced.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the technical problem that the torque setting of the existing torque wrench is inconvenient. A preset torque wrench with a rear hand wheel for conveniently setting torque is provided.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a preset torque wrench of a rear hand wheel comprises a handle, a working head, a connector, a hand wheel, a plug, a screw, a sleeve, a pointer, a spring, a top ring, a roller, a lever, a pin and a force bearing pin, wherein the working head and the handle are both in a tubular shape, through holes are processed in the horizontal direction at the rear end of the working head and the front end of the handle, a working hole is processed in the vertical direction at the bottom of the front part of the working head, hemispherical surfaces are processed at the two ends of the force bearing pin, the two ends of the force bearing pin are abutted against the inner wall of the working head, a connecting part is processed at the bottom of the connector, the middle part of the connector is rotatably connected with the working hole, the rear part of the working head is sleeved at the front end of the handle, the rear end of the working head and the front end of the handle are connected through the pin, the middle part of, the outer wall of the top ring is abutted to the inner wall of the handle, the roller is rotatably installed on the front portion of the top ring, the rear portion of the lever is abutted to the roller, the spring is placed in the handle, the rear portion of the top ring is abutted to the spring, a pointer groove is machined in the middle of the handle, scale marks are machined on two sides of the pointer groove, the sleeve is sleeved in the handle, the pointer is fixedly connected with the sleeve, the pointer is clamped in the pointer groove, an internal thread is machined in the rear portion of the sleeve, the screw is in threaded connection with the rear portion of the sleeve, the plug is fixedly connected with the handle, the screw is abutted to the plug, and the hand wheel is fixedly connected with. When the bearing pin receives the rotation torque of the connector, the two ends of the bearing pin extrude the inner wall of the working head, the working head is in a tubular shape, the acting force of the inner wall of the working head on the two ends of the bearing pin can be decomposed into two parts, one part provides the torque for rotating the connector, the other part enables the connector to have the trend of upward movement, the connector acts on the roller and the top ring through a lever, the top ring provides preset force through a spring, when the rotation torque of the connector exceeds a certain value, the top ring can be pushed back, one end of the lever can impact the inner wall of the handle, vibration and sound are generated, and the prompt torque reaches a set value.

Preferably, the connecting part at the bottom of the connector is a square interface.

Preferably, the handle is arranged at the rear part of the handle.

The substantial effects of the invention are as follows: a stress application sleeve rod is omitted, torque is set through a rear hand wheel, the stress application sleeve rod does not need to be locked after the torque is set, and the torque setting efficiency is improved.

Drawings

Fig. 1 is a schematic structural view of a preset torque wrench according to an embodiment.

Fig. 2 is a schematic cross-sectional view of a preset torque wrench according to an embodiment.

Fig. 3 is a schematic view of a preset torque wrench head according to an embodiment.

Fig. 4 is a schematic cross-sectional view of a preset torque wrench head according to an embodiment.

Wherein: 1. the device comprises a grab handle, 2, a hand wheel, 3, a pointer, 4, a pointer groove, 5, a handle, 6, a pin, 7, a working head, 8, a connector, 9, a sleeve, 10, a lever, 11, a spring, 12, a top ring, 13, a roller, 14, a bearing pin, 15 and a pressing nail.

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 of a rear hand wheel 2 is disclosed, as shown in figures 1 to 4, and comprises a handle 5, a working head 7, a connector 8, a hand wheel 2, a plug, a screw rod, a sleeve 9, a pointer 3, a spring 11, a top ring 12, a roller 13, a lever 10, a pin 6 and a force bearing pin 14, wherein the working head 7 and the handle 5 are both in a tubular shape, through holes are processed at the rear end of the working head 7 and the front end of the handle 5 along the horizontal direction, working holes are processed at the bottom of the front part of the working head 7 along the vertical direction, two ends of the force bearing pin 14 are processed into a hemispherical surface, two ends of the force bearing pin 14 are abutted against the inner wall of the working head 7, a connecting part is processed at the bottom of the connector 8, the middle part of the connector 8 is rotatably connected with the working holes, the rear part of the working head 7 is sleeved at the front end of the handle 5, the rear end of the working head 7, top ring 12 installs in

handle

5, 12 outer walls of top ring and the 5 inner wall butts of handle, 13 rotations of gyro wheel are installed at top ring 12 front portions, 10 rear portions of lever and 13 butts of gyro wheel, spring 11 is put into in

handle

5, 12 rear portions of top ring and 11 butts of spring, 5 middle part processing of handle has pointer groove 4, pointer groove 4 both sides processing scale mark, sleeve 9 embolias in handle 5, pointer 3 and sleeve 9 fixed connection, 3 card of pointer are gone into in the pointer groove 4, sleeve 9 rear portion processing has the internal thread, screw rod and 9 rear portion threaded connection of sleeve, end cap and 5 fixed connection of handle, screw rod and end cap butt, hand wheel 2 and screw rod fixed connection. The connecting part at the bottom of the connector 8 is a square interface. The grab handle 1 is mounted at the rear of the handle 5. The front end of the lever 10 is provided with a pressing nail 15, and the lever 10 is abutted to the connecting head 8 through the pressing nail 15.

The working process of the embodiment is as follows: when the bearing pin 14 receives the rotation torque of the connector 8, two ends of the bearing pin 14 extrude the inner wall of the working head 7, the working head 7 is tubular, the acting force of the inner wall of the working head 7 on the two ends of the bearing pin 14 can be decomposed into two parts, one part provides the torque for rotating the connector 8, the other part enables the connector 8 to have the trend of moving upwards, the connector 8 acts on the roller 13 and the top ring 12 through the lever 10, the top ring 12 is provided with preset force through the spring 11, when the rotation torque of the connector 8 exceeds a certain value, the top ring 12 can be pushed back, one end of the lever 10 can impact the inner wall of the handle 5 to generate vibration and sound, and the prompt torque reaches a set value.

The substantial effect of the embodiment is as follows: the boosting sleeve rod is omitted, the torque is set through the rear hand wheel 2, the boosting sleeve rod does not need to be locked after the torque is set, and the torque setting efficiency is improved.

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 hand wheel is characterized in that,

comprises a handle, a working head, a connector, a hand wheel, a plug, a screw, a sleeve, a pointer, a spring, a top ring, a roller, a lever, a pin and a bearing pin,

the working head and the handle are both in a tubular shape, through holes are processed at the rear end of the working head and the front end of the handle along the horizontal direction, working holes are processed at the bottom of the front part of the working head along the vertical direction, two ends of the force bearing pin are processed into hemispheres, two ends of the force bearing pin are abutted against the inner wall of the working head, a connecting part is processed at the bottom of the connector, the middle part of the connector is rotatably connected with the working holes, the rear part of the working head is sleeved at the front end of the handle, the rear end of the working head and the front end of the handle are connected through the pin, the middle part of the lever is rotatably connected with the pin, the,

the top ring is arranged in the handle, the outer wall of the top ring is abutted against the inner wall of the handle, the roller is rotatably arranged at the front part of the top ring, the rear part of the lever is abutted against the roller, the spring is arranged in the handle, the rear part of the top ring is abutted against the spring,

the improved handle is characterized in that a pointer groove is formed in the middle of the handle, scale marks are formed in two sides of the pointer groove, the sleeve is sleeved in the handle, the pointer is fixedly connected with the sleeve, the pointer is clamped in the pointer groove, internal threads are formed in the rear portion of the sleeve, the screw is in threaded connection with the rear portion of the sleeve, the plug is fixedly connected with the handle, the screw is abutted to the plug, and the hand wheel is fixedly connected with the screw.

2. The preset torque wrench with a rear hand wheel according to claim 1,

the connecting part at the bottom of the connector is a square interface.

3. The preset torque wrench with a rear hand wheel according to claim 1 or 2,

the handle is arranged at the rear part of the handle.