CN113276050A

CN113276050A - Tool connecting rod

Info

Publication number: CN113276050A
Application number: CN202110512420.8A
Authority: CN
Inventors: 张叶青
Original assignee: Unique Enterprise Co ltd
Current assignee: Unique Enterprise Co ltd
Priority date: 2021-05-11
Filing date: 2021-05-11
Publication date: 2021-08-20
Anticipated expiration: 2041-05-11
Also published as: CN113276050B

Abstract

The invention relates to a tool extension rod, comprising: the body comprises a driving part and an assembling part relative to the driving part, wherein the assembling part is provided with an assembling hole extending along an axial direction; the sleeving part is arranged on the assembling part in a non-rotating manner and comprises at least one sleeving hole for connecting the sleeving part; and a magnetic attraction mechanism arranged in the assembly hole and comprising a magnetic attraction piece penetrating through the sleeve-joint piece and an elastic piece axially elastically propped against the body and the magnetic attraction piece, wherein a first gap is formed between the sleeve-joint piece and the magnetic attraction piece in the circumferential direction of the magnetic attraction piece, and the sleeve-joint piece and the magnetic attraction piece can radially deviate relatively. The tool connecting rod provided by the invention is easy to produce and good in use durability.

Description

Tool connecting rod

Technical Field

The invention relates to a tool connecting rod.

Background

The conventional tool extension rod 100 (refer to fig. 9 and 10) includes a rod 101 and a sleeve 102 sleeved on the rod 101 in a non-rotatable manner, the sleeve is used for connecting a connecting member 200 (such as but not limited to a screwdriver bit, a screw, a nut, etc.), one end of the rod 101 is used for being connected with a driving tool to drive the tool extension rod 100 to rotate, the other end of the rod passes through the sleeve 102, and a magnetic member 103 is provided for adsorbing the connecting member 200.

However, the radial dimensions of the rod 101 and the sleeve 102 generally correspond to each other and cannot be shifted from each other in the radial direction, so when the tool link rod 100 is driven to rotate the connecting element 200, the magnetic element 103 is easily broken by the impact and torsion of the connecting element 200, and the durability is not good. In addition, when the rod 101 is assembled with the sleeve 102, the relative position between the magnetic element 103 and the sleeve 102 is easily changed due to production tolerance. For example, when the machining tolerance of the rod 101 is too short or the machining tolerance of the sleeve 102 is too long, the distance between the magnetic element 103 and a mating hole of the sleeve 102 is too short, and a gap 104 is generated between the magnetic element 103 and the connector 200, as shown in fig. 9, which easily results in insufficient attraction of the magnetic element 103 and failure to effectively attract the connector 200; when the machining tolerance of the rod 101 is too long or the machining tolerance of the sleeve 102 is too short, the distance between the magnetic member 103 protruding from the sleeve hole is too long, the depth of the connecting member 200 inserted into the sleeve hole 104 is insufficient, and the end faces of the connecting member 200 and the sleeve 102 are separated by a gap 105 and cannot be abutted against each other, as shown in fig. 10, which easily causes the problems of poor operation stability and force transmission efficiency, too large stress on the magnetic member 103, easy breakage, and the like. Therefore, the conventional tool extension bar 100 requires high dimensional accuracy and is expensive to manufacture.

Therefore, there is a need for a new and improved tool extension rod to solve the above problems.

Disclosure of Invention

The invention mainly aims to provide a tool connecting rod which is easy to produce and has good use durability.

To achieve the above object, the present invention provides a tool connecting rod, including: the body comprises a driving part and an assembling part relative to the driving part, wherein the assembling part is provided with an assembling hole extending along an axial direction; the sleeving part is arranged on the assembling part in a non-rotating manner and comprises at least one sleeving hole for connecting the sleeving part; and a magnetic attraction mechanism arranged in the assembly hole and comprising a magnetic attraction piece penetrating through the sleeve-joint piece and an elastic piece axially elastically propped against the body and the magnetic attraction piece, wherein a first gap is formed between the sleeve-joint piece and the magnetic attraction piece in the circumferential direction of the magnetic attraction piece, and the sleeve-joint piece and the magnetic attraction piece can radially deviate relatively.

Preferably, the socket further includes a through groove communicating with each of the trepanning holes, the through groove has a small diameter in each of the trepanning holes, and the first gap is defined between the groove peripheral wall of the through groove and the magnetic suction member.

Preferably, the magnetic member includes a magnetic end portion, and the magnetic end portion at least partially protrudes out of the through slot and is located in the trepan boring.

Preferably, the socket member is detachably inserted into the assembling hole, the at least one socket hole includes a first socket hole and a second socket hole disposed at two opposite ends of the through groove, and a blocking shoulder capable of blocking with the magnetic member in the axial direction is disposed between the first socket hole and the through groove and between the second socket hole and the through groove.

Preferably, the first and second set of apertures differ in at least one of shape, radial dimension and axial depth.

Preferably, the socket joint further comprises a clamping mechanism, wherein the clamping mechanism comprises at least one clamping piece which is retractably and convexly arranged on the inner peripheral wall of the assembly part, and at least one clamping groove which can be clamped with the at least one clamping piece is concavely arranged on the outer peripheral wall of the socket joint piece.

Preferably, an outer peripheral wall of the assembling portion is concavely provided with a ring groove, the bottom of the ring groove is penetrated with at least one through hole communicated with the assembling hole, each clamping piece is accommodated in one through hole, and the clamping mechanism further comprises an elastic piece which is accommodated in the ring groove and radially abuts against and pushes the at least one clamping piece towards the assembling hole.

Preferably, the assembly portion is provided with a blocking portion in a radially protruding manner, the magnetic member includes a large-diameter section, a small-diameter section and a shoulder portion connected between the large-diameter section and the small-diameter section, the large-diameter section is provided with a head portion capable of being blocked by the blocking portion in the axial direction, and the shoulder portion is abutted to the sleeve member in the axial direction.

Preferably, the large-diameter section penetrates through the blocking portion, and a second gap is formed between the large-diameter section and the blocking portion in the circumferential direction.

Preferably, the first gap is not less than 0.5 mm viewed along the axial direction; the magnetic part comprises a magnetic end part, and at least part of the magnetic end part protrudes out of the through groove and is positioned in the trepan boring; the magnetic attraction end part comprises a groove and a magnet accommodated in the groove, and the magnet axially protrudes out of the groove; the tool connecting rod also comprises a clamping mechanism, the clamping mechanism comprises at least one clamping piece which is retractably and convexly arranged on the inner peripheral wall of the assembly part, and the outer peripheral wall of the sleeve joint piece is concavely provided with at least one clamping groove which can be clamped with the at least one clamping piece; an annular groove is concavely arranged on the peripheral wall of the assembly part, at least one through hole communicated with the assembly hole is arranged at the bottom of the annular groove in a penetrating way, each clamping piece is accommodated in one through hole, and the clamping mechanism further comprises an elastic abutting piece which is accommodated in the annular groove and radially abuts against and pushes the at least one clamping part towards the assembly hole; the elastic supporting piece is a ring-shaped spring sleeved on the annular groove; the assembly part is radially provided with a blocking part in a protruding mode, the magnetic part comprises a large-diameter section, a small-diameter section and a shoulder part connected between the large-diameter section and the small-diameter section, the large-diameter section is provided with a head part capable of being blocked with the blocking part in the axial direction, and the shoulder part is abutted to the blocking shoulder in the axial direction; the connecting hole comprises a first section adjacent to the driving part and a second section which is communicated with the first section and is opened outwards, the first section is smaller than the second section and is provided with the blocking part, and the second section is provided with the connecting piece; the stop part comprises a limit ring capable of axially interfering with the head part and a clamping piece for connecting the assembling part and the limit ring; and the large-diameter section penetrates through the blocking part, and a second gap is formed between the large-diameter section and the blocking part in the circumferential direction.

The invention has the advantages that:

the tool connecting rod provided by the invention is easy to produce and good in use durability.

Drawings

Fig. 1 is a perspective view of a preferred embodiment of the present invention.

Fig. 2 is an exploded view of a preferred embodiment of the present invention.

Fig. 3 is another perspective view of a preferred embodiment of the present invention.

Fig. 4 is a sectional view of a preferred embodiment of the present invention in use.

Fig. 5 is a cross-sectional view of a preferred embodiment of the present invention in another use state.

Fig. 6 is a partially enlarged view of fig. 4.

FIG. 7 is a schematic diagram illustrating the operation of the present invention.

FIG. 8 is a schematic diagram of an application of the present invention.

Fig. 9 and 10 are schematic views illustrating the use of a conventional tool joint.

Detailed Description

The following description is given by way of example only, and is not intended to limit the scope of the invention.

Referring to fig. 1 to 8, which illustrate a preferred embodiment of the present invention, a tool extension bar 1 of the present invention includes a body 10, a sleeve 20, and a magnetic attraction mechanism 30.

The main body 10 includes a driving portion 11 and a coupling portion 12 opposite to the driving portion 11, the coupling portion 12 has a coupling hole 121 extending along an axial direction a; the sleeve member 20 is non-rotatably disposed on the assembly portion 12 and includes at least one sleeve hole 21 for connecting a connecting member 2; the magnetic attraction mechanism 30 is disposed in the connection hole 121 and includes a magnetic attraction member 31 (refer to fig. 4 and 5) passing through the socket member 20 and an elastic member 32 axially elastically abutting against the body 10 and the magnetic attraction member 31, and in a circumferential direction of the magnetic attraction member 31, a first gap G1 is formed between the socket member 20 and the magnetic attraction member 31 and can be radially offset relative thereto. Therefore, the elastic member 32 can keep the magnetic member 31 having a tendency of moving toward the at least one set of holes 21, and the tolerance to the production tolerance is high, so that the production is easy; when the driving portion 11 is driven to drive the connecting member 2 to rotate, the elastic member 32 and the first gap G1 allow the magnetic member 31 to slightly shift and rotate relative to the socket member 20, so as to effectively prevent the magnetic member 31 from being damaged by impact and distortion, and have good durability.

The driving part 11 can be connected to a pneumatic tool, an electric tool or a handle 3 (as shown in fig. 8), and the like, and has a wide application range; the connecting element 2 is for example, but not limited to, a screw, a nut, a socket or a driver head. In detail, the socket 20 further includes a through groove 22 communicating with each of the holes 21, the through groove 22 is smaller than each of the holes 21, and the first gap G1 is defined between the circumferential wall of the through groove 22 and the magnetic attraction member 31; in this embodiment, the first gap G1 extends annularly along the circumferential direction to allow the magnetic attraction member 31 to rotate and shift relative to the socket member 20 when being stressed, and the degree of freedom of movement is large; the first gap G1 is not less than 0.5 mm (preferably not more than 1 mm) viewed along the axial direction a to provide sufficient movement margin while maintaining stable assembly. The magnetic member 31 includes a magnetic end 311, the magnetic end 311 at least partially protrudes out of the through slot 22 and is located in the sleeve hole 21, and the magnetic attraction is larger so as to attract the connecting member 2. In detail, the magnetic attraction end 311 includes a recess 312 and a magnet 313 received in the recess 312, the magnet 313 preferably axially protrudes from the recess 312, and the magnetic attraction effect is better. However, in the circumferential direction, the groove peripheral wall of the through groove and the magnetic part can also be partially contacted to define one or more first gaps; the magnet can be flush with the groove; the magnetic end can also be directly connected with a magnet without the groove.

The tool extension rod 1 further includes a locking mechanism 40, the locking mechanism 40 includes at least one locking member 41 that is retractably and convexly disposed on an inner peripheral wall of the assembly portion 12, and an outer peripheral wall of the socket member 20 is concavely disposed with at least one locking groove 24 that can be locked with the at least one locking member 41, so that the socket member 20 and the assembly portion 12 can be detachably assembled. In this embodiment, an annular groove 124 is concavely formed on an outer peripheral wall of the assembling portion 12, at least one through hole 125 communicating with the assembling hole 121 is formed through a bottom of the annular groove 124, each of the engaging members 41 is accommodated in one of the through holes 125, and the engaging mechanism 40 further includes an elastic member 42 accommodated in the annular groove 124 and radially pushing the at least one engaging member 41 toward the assembling hole 121, so that the at least one engaging member 41 has a tendency to radially move toward the assembling hole 121; each of the engaging members 41 is a steel ball, and the resilient member 42 is a ring-shaped spring sleeved in the annular groove 124, so that the structure is simple and the assembly and processing are convenient. In other embodiments, the locking mechanism may also have a plurality of locking members; the clamping mechanism can also be provided with a plurality of elastic parts respectively corresponding to the clamping parts; the at least one latch member can also be a blocking protrusion selectively protruding the set of connection holes.

Referring to fig. 4 to 7, the socket 20 is detachably inserted into the set of holes 121, the magnetic end 311 preferably axially protrudes out of the set of holes 121, so that the socket 20 can be directly detached to remove impurities (such as iron filings 4) adsorbed on the magnet 313, as shown in fig. 7; the at least one sleeve hole 21 includes a first sleeve hole 211 and a second sleeve hole 212 disposed at two opposite ends of the through slot 22, and a blocking

shoulder

23a,23b capable of blocking with the magnetic attraction member 31 in the axial direction a is respectively disposed between the first sleeve hole 211 and the second sleeve hole 212 and the through slot 22, so that the sleeve member 20 can be abutted against the magnetic attraction member 31 through the blocking

shoulder

23a,23b to keep the magnetic attraction member 31 protruding from one of the first sleeve hole 211 and the second sleeve hole 212 regardless of the end having the first sleeve hole 211 or the end having the second sleeve hole 212 being inserted into the connection hole 121. At least one of the shape, radial dimension and axial depth of the first and

second sockets

211 and 212 are different, so that the assembling direction of the socket 20 can be changed as required to adapt to the connecting pieces 2 of different specifications.

Furthermore, the assembling portion 12 is radially and convexly provided with a stopping portion 13, the magnetic member 31 includes a large diameter section 314, a small diameter section 315 and a shoulder portion 316 connected between the large diameter section 314 and the small diameter section 315, the large diameter section 314 is provided with a head portion 317 which can be blocked with the stopping portion 13 in the axial direction a, the shoulder portion 316 is abutted with the socket member 20 in the axial direction a, thereby preventing the magnetic member 31 from coming off the assembling hole 121, and the shoulder portion 316 can be abutted with one of the stopping

shoulders

23a and 23b of the socket member 20 for limiting to fit the at least one socket hole 21 with different axial depths. For example, when the socket 20 is inserted into the set of holes 121 with the end having the second socket 212 and the blocking shoulder 23b abuts against the shoulder 316, the axial depth of the second socket 212 is deeper, the large diameter section 314 can extend into the second socket 212 more, so that the magnetic end 311 protrudes into the first socket 211, as shown in fig. 4 and 6; when the socket 20 is inserted into the connection hole 121 with the end having the first socket 211, because the axial depth of the first socket 211 is shallow, when the shoulder 23a abuts against the shoulder 316, the head 317 compresses the elastic member 32 to make the magnetic member 31 move axially toward one side of the driving portion 11, so as to avoid the magnetic end 311 protruding into the second socket 212 excessively to allow the socket to connect with the connecting member 2 having a larger height, as shown in fig. 5. Through the structure, the relative positions of the components after assembly can be accurately corresponding to each other and the length of the magnetic attraction end part 311 protruding into each sleeve hole 21 can be effectively limited, thereby reducing the influence of production tolerance and reducing the production cost.

The large diameter section 314 passes through the stopping portion 13, and a second gap G2 is formed between the large diameter section 314 and the stopping portion 13 in the circumferential direction, so as to keep the magnetic member 31 moving in the circumferential direction and prevent components from being damaged. In this embodiment, the connection hole 121 includes a first section 122 adjacent to the driving portion 11 and a second section 123 communicating with the first section 122 and opening outward, the first section 122 has a smaller diameter than the second section 123 and is provided with the stopping portion 13, and the second section 123 accommodates the socket 20; the stop portion 13 includes a stop ring 131 capable of axially interfering with the head portion 317 and a clamping member 132 connecting the assembling portion 12 and the stop ring 131, so as to achieve stable blocking and convenient assembly. However, the stop ring can also be connected with the assembling part in a tight fit manner without the clamping piece; the assembly portion can also be integrally provided with the stop portion in a protruding manner.

The above description is of the preferred embodiment of the present invention and the technical principles applied thereto, and it will be apparent to those skilled in the art that any changes and modifications based on the equivalent changes and simple substitutions of the technical solution of the present invention are within the protection scope of the present invention without departing from the spirit and scope of the present invention.

Claims

1. A tool extension bar, comprising:

the body comprises a driving part and an assembling part relative to the driving part, wherein the assembling part is provided with an assembling hole extending along an axial direction;

the sleeving part is arranged on the assembling part in a non-rotating manner and comprises at least one sleeving hole for connecting the sleeving part; and

a magnetic attraction mechanism arranged in the assembly hole and comprising a magnetic attraction piece penetrating through the sleeve-joint piece and an elastic piece axially elastically propped against the body and the magnetic attraction piece, wherein a first gap is formed between the sleeve-joint piece and the magnetic attraction piece in the circumferential direction of the magnetic attraction piece, and the sleeve-joint piece and the magnetic attraction piece can radially deviate relatively.

2. The tool extension rod of claim 1, wherein the socket further comprises a through slot communicating with each of the holes, the through slot having a smaller diameter than each of the holes and defining the first gap between a peripheral wall of the through slot and the magnetic member.

3. The tool extension rod of claim 2, wherein the magnetic member includes a magnetic end portion, and the magnetic end portion at least partially protrudes from the through slot and is disposed in the sleeve hole.

4. The tool extension rod of claim 2, wherein the sleeve member is detachably inserted into the connecting hole, the at least one sleeve hole includes a first sleeve hole and a second sleeve hole disposed at opposite ends of the through groove, and a blocking shoulder capable of being blocked by the magnetic member in the axial direction is disposed between the first sleeve hole and the through groove and between the second sleeve hole and the through groove.

5. The tool extension rod of claim 4, wherein the first and second set of holes differ in at least one of shape, radial dimension, and axial depth.

6. The extension rod for tools of claim 1, further comprising a locking mechanism, wherein the locking mechanism comprises at least one locking member retractably protruding from an inner peripheral wall of the connecting portion, and an outer peripheral wall of the engaging member is recessed with at least one engaging groove for engaging with the at least one locking member.

7. The tool extension rod of claim 6, wherein an annular groove is recessed in an outer peripheral wall of the connecting portion, at least one through hole is formed in a bottom of the annular groove and communicates with the connecting hole, each of the engaging members is received in one of the through holes, and the engaging mechanism further includes an urging member received in the annular groove and radially urging the at least one engaging member toward the connecting hole.

8. The tool extension rod of any one of claims 1-7, wherein the coupling portion has a radially protruding stop portion, the magnetic member includes a large diameter section, a small diameter section and a shoulder portion connected between the large diameter section and the small diameter section, the large diameter section has a head portion capable of being engaged with the stop portion in the axial direction, and the shoulder portion is in abutment with the socket member in the axial direction.

9. The tool extension rod of claim 8, wherein the large diameter section is disposed through the stop portion, and a second gap is formed between the large diameter section and the stop portion in the circumferential direction.

10. The tool extension bar of claim 5, wherein the first gap is not less than 0.5 mm when viewed along the axial direction; the magnetic part comprises a magnetic end part, and at least part of the magnetic end part protrudes out of the through groove and is positioned in the trepan boring; the magnetic attraction end part comprises a groove and a magnet accommodated in the groove, and the magnet axially protrudes out of the groove; the tool connecting rod also comprises a clamping mechanism, the clamping mechanism comprises at least one clamping piece which is retractably and convexly arranged on the inner peripheral wall of the assembly part, and the outer peripheral wall of the sleeve joint piece is concavely provided with at least one clamping groove which can be clamped with the at least one clamping piece; an annular groove is concavely arranged on the peripheral wall of the assembly part, at least one through hole communicated with the assembly hole is arranged at the bottom of the annular groove in a penetrating way, each clamping piece is accommodated in one through hole, and the clamping mechanism further comprises an elastic abutting piece which is accommodated in the annular groove and radially abuts against and pushes the at least one clamping part towards the assembly hole; the elastic supporting piece is a ring-shaped spring sleeved on the annular groove; the assembly part is radially provided with a blocking part in a protruding mode, the magnetic part comprises a large-diameter section, a small-diameter section and a shoulder part connected between the large-diameter section and the small-diameter section, the large-diameter section is provided with a head part capable of being blocked with the blocking part in the axial direction, and the shoulder part is abutted to the blocking shoulder in the axial direction; the connecting hole comprises a first section adjacent to the driving part and a second section which is communicated with the first section and is opened outwards, the first section is smaller than the second section and is provided with the blocking part, and the second section is provided with the connecting piece; the stop part comprises a limit ring capable of axially interfering with the head part and a clamping piece for connecting the assembling part and the limit ring; and the large-diameter section penetrates through the blocking part, and a second gap is formed between the large-diameter section and the blocking part in the circumferential direction.