CN212653235U - Output shaft rotation limiting structure of hand-held machine tool - Google Patents

Abstract

The utility model discloses an output shaft rotation limit structure of hand-held type machine tool, this hand-held type machine tool have a casing, a drive shaft of locating in this casing, and one locate the output shaft of this casing and this drive shaft perpendicularly, this output shaft supplies a grinding piece to install, this output shaft and this drive shaft turn to drive gear set interlock through one, and this hand-held type machine tool can define out both sides based on an extension line of this drive shaft. The output shaft rotation limiting structure comprises a mounting hole which is arranged on the shell and is positioned on one of two sides of the handheld machine tool, a limiting hole which is arranged on the output shaft and can face the mounting hole, and a rotation limiting group. The rotation limiting set comprises a bearing frame arranged in the mounting hole, a limiting bolt arranged on the bearing frame and a spring, wherein the limiting bolt is stressed to stretch into the limiting hole to interfere the output shaft to rotate.

Description

Output shaft rotation limiting structure of hand-held machine tool

Technical Field

The utility model relates to an output shaft rotation limit structure especially relates to an output shaft rotation limit structure of hand-held type machine tool.

Background

In the conventional hand-held machine tool, when the grinding piece is replaced, in order to prevent the output shaft from being driven by the grinding piece during replacement, the grinding piece is difficult to take down relative to the output shaft, two spanners are additionally utilized in the conventional process of replacing the grinding piece, one of the two spanners is used for fixing the output shaft, and the other spanner is used for rotating the sleeve at the bottom end of the output shaft, so that the sleeve is unscrewed and the grinding piece is replaced. However, the conventional fastening method requires a double wrench, which is inconvenient, and in order to improve this drawback, manufacturers of hand-held power tools have changed to provide a structure for limiting the rotation of the output shaft on the hand-held power tool.

In taiwan patent TW I288684, although an output shaft rotation restricting structure is provided, the output rotation restricting structure is actually used to restrict rotation of a steering gear set, thereby restricting rotation of the output shaft. However, once the engagement between the steering gear set and the output shaft is released, the output shaft is difficult to be fixed again in this limiting manner.

In addition, CN 206464951U, taiwan patents TW M449058U and CN 108972342 disclose that the output shaft rotation restriction structure of the hand-held power tool of this type is directly used to restrict the rotation of the output shaft, but the output shaft rotation restriction structure is disposed in the extending direction of the driving shaft. As an example, in taiwan patent TW M449058U, the output shaft rotation limiting structure disclosed in the disclosure is located above the head of the hand-held power tool, but the driving switch of the hand-held power tool and the output shaft rotation limiting structure are also located in the extending direction of the driving shaft and located in the same extending plane, as shown in fig. 3. Moreover, when the user intends to replace the polishing pad of the hand-held machine tool, the user holds the hand-held machine tool with one hand and places the thumb on the output shaft rotation limiting structure, so that the user can operate the output shaft rotation limiting structure with the thumb to fix the output shaft. However, the four fingers of the user's thumb are easily placed on the driving switch, so that the user may mistakenly touch the driving switch when operating the output shaft rotation limiting structure.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a main purpose lies in solving and practising output shaft rotation restriction structure when the one hand is implemented, leads to the user to touch drive switch's problem by mistake easily.

To achieve the above object, the present invention provides an output shaft rotation limiting structure of a hand-held power tool, the hand-held power tool comprising a housing, a driving assembly disposed in the housing, a driving shaft disposed in the housing and driven by the driving assembly, and an output shaft disposed in the housing and extending perpendicular to the driving shaft, the output shaft being provided with a grinding member, the output shaft being coupled to the driving shaft via a steering gear set, the hand-held power tool being capable of defining two sides based on an extension line of the driving shaft, the output shaft rotation limiting structure comprising a mounting hole, a limiting hole and a rotation limiting set, the mounting hole being disposed in the housing and located at one of the two sides of the hand-held power tool, the limiting hole being disposed in the output shaft and directly facing the mounting hole, the rotation limiting set having a support frame disposed in the mounting hole, the limiting bolt is arranged in the bearing frame and exposed out of the shell, and the spring is arranged in the bearing frame and provides a resetting acting force for the limiting bolt, and the limiting bolt can extend into the limiting hole to interfere the rotation of the output shaft when being stressed to move towards the output shaft.

In one embodiment, the limiting hole penetrates through the output shaft.

In one embodiment, the center of the limiting hole is offset from the center of the output shaft.

In one embodiment, the support frame has a first opening for the insertion of the limit pin and a second opening which is coaxial with the first opening and through which the limit pin can pass.

In one embodiment, the limit bolt has an operation portion exposed outside the housing, a connection portion extending from the operation portion and located inside the support frame, and a limit portion extending from the connection portion and capable of passing through the second opening, and the connection portion has a rib capable of abutting against the periphery of the first opening to limit the limit bolt from being separated from the support frame.

In one embodiment, the size of the restriction portion is smaller than the size of the connection portion.

In one embodiment, the connecting portion has a step connecting surface adjacent to the limiting portion, and a guiding inclined surface connecting the step connecting surface and extending away from the limiting portion.

In one embodiment, the side of the convex rib facing the limiting portion is connected with the guiding inclined surface without step difference.

In one embodiment, the support frame is a tubular structure.

In one embodiment, the support frame has a first thread disposed on the exterior, and the mounting hole has a second thread engaged with the first thread.

In one embodiment, the support frame has a first portion disposed in the housing and a second portion exposed from the housing, and the first thread is disposed on the first portion.

In one embodiment, the cross-section of the shelf at the second portion is polygonal.

Through the utility model discloses aforementioned take off, compare in the conventional characteristics that have following: the utility model discloses one of them of this hand-held type machine tool both sides is located to this output shaft rotation restriction structure, this output shaft rotation restriction structure's extension plane simultaneously, it is crisscross each other with the extension plane of the drive switch of this hand-held type machine tool for the user plans to change this and grinds when changing its gesture of gripping, the user thumb correspondence is placed on this output shaft rotation restriction structure position, user's four fingers can not correspond and place on drive switch, and then reduce the condition that the mistake touched this drive switch. Additionally, the utility model discloses this output shaft rotation restriction structure is direct to this output shaft and restricts, and does not reach indirectly through other components and interfere this output shaft, and then can avoid producing because of the pine takes off between the structure and can't specifically restrict this output shaft and rotate. Furthermore, the utility model discloses this rotation restriction structure can be an independent component, the utility model discloses only need form out this mounting hole and this restriction hole on this hand-held type machine tool in the assembling process, directly assemble this rotation restriction structure in this mounting hole in the back, can accomplish the equipment of this hand-held type machine tool, make and should the utility model has the characteristics of easily installing.

Drawings

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

Fig. 2 is an exploded view of a part of the structure according to an embodiment of the present invention.

Fig. 3 is a schematic structural cross-sectional view (a) according to an embodiment of the present invention.

Fig. 4 is a schematic structural sectional view (ii) according to an embodiment of the present invention.

Fig. 5 is a schematic structural sectional view (iii) according to an embodiment of the present invention.

Fig. 6 is an operation diagram of an embodiment of the present invention.

Fig. 7 is an enlarged sectional view of a part of the components of the present invention.

Fig. 8 is a schematic view of a hand-held power tool with a mounting hole on one side for use in holding the hand-held power tool according to an embodiment of the present invention.

Fig. 9 is a schematic view of an embodiment of the present invention showing a mounting hole on the other side of the hand-held power tool for use in holding.

Fig. 10 is a schematic structural sectional view of another embodiment of the present invention.

Fig. 11 is an operation diagram of another embodiment of the present invention.

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Detailed Description

The detailed description and technical contents of the present invention are described below with reference to the accompanying drawings:

referring to fig. 1 to 4, before describing the output shaft rotation limiting structure 11, the present invention provides an output shaft rotation limiting structure 11 of a hand-held power tool, first, the hand-held power tool 10 is described. The hand-held power tool 10 may be an abrasive power tool having an abrasive element 20 or a cutting power tool having the abrasive element 20, wherein the abrasive element 20 is illustrated in fig. 1 for ease of understanding only, and is not intended to limit the aspect of the abrasive element 20. Furthermore, the hand-held power tool 10 comprises, in addition to the output shaft rotation limiting structure 11, a housing 14, a driving assembly 15, a driving shaft 16 and an output shaft 17. The housing 14 includes a holding portion 141 and a head portion 142 connected to the holding portion 141, the head portion 142 is connected to one end of the holding portion 141, the holding portion 141 is used for being held by a user, the holding portion 141 forms a basic appearance of the hand-held power tool 10, the head portion 142 is connected to one end of the holding portion 141, and the head portion 142 is perpendicular to the holding portion 141. In addition, the driving component 15 is disposed in the holding portion 141, the driving component 15 can be a motor (not shown) and an impeller (not shown), and the driving component 15 is controlled to be activated. The drive shaft 16 is located in the holding portion 141, and one end of the drive shaft is connected to the drive element 15, and the drive shaft 16 is driven when the drive element 15 is activated, and simultaneously drives other components in the hand-held power tool 10. On the other hand, the output shaft 17 is disposed in the housing 14 and located in the head portion 142, the output shaft 17 is disposed vertically relative to the driving shaft 16, the output shaft 17 has an extension line 171, and the extension line 171 of the output shaft 17 is perpendicular to an extension line 161 of the driving shaft 16. The output shaft 17 is not directly connected to the driving shaft 16, a steering gear set 18 is connected between the output shaft 17 and the driving shaft 16, and the output shaft 17 is driven by the driving shaft 16 through the steering gear set 18. In one embodiment, the steering gear set 18 includes a first steering gear 181 disposed at one end of the driving shaft 16, and a second steering gear 182 disposed at one end of the output shaft 17, the first steering gear 181 is disposed at one end of the driving shaft 16 facing the output shaft 17, the second steering gear 182 is disposed at one end of the output shaft 17 facing the driving shaft 16, the first steering gear 181 is driven by the driving shaft 16, the second steering gear 182 is driven by the output shaft 17, the first steering gear 181 and the second steering gear 182 are also vertically disposed, the first steering gear 181 is partially engaged with the second steering gear 182, such that after the first steering gear 181 is driven by the driving shaft 16, the first steering gear 181 drives the second steering gear 182, and further drives the output shaft 17. When the output shaft 17 is provided with the grinding member 20, the output shaft 17 is driven by the steering gear set 18 to drive the grinding member 20 to rotate.

Further, referring to fig. 2 to 4, the hand-held power tool 10 may define two sides 101, 102 based on the extension line 161 of the driving shaft 16 when viewed from a top view, and the output shaft rotation limiting structure 11 is disposed on one of the two sides 101, 102 of the hand-held power tool 10. The above-mentioned top view angle is an angle at which the human eye directly looks from above when the hand-held power tool 10 is placed with the polishing member 20 placed below. Further, the output shaft rotation limiting structure 11 is disposed on the output shaft 17, and in one embodiment, the extending direction 133 of the output shaft rotation limiting structure 11 intersects the extending line 171 of the output shaft 17 at 90 degrees, as shown in fig. 5. More specifically, the output shaft rotation limiting structure 11 includes a mounting hole 111, a limiting hole 112 and a rotation limiting set 113, wherein the mounting hole 111 is disposed in the housing 14 and located on one of the two sides 101, 102 of the hand-held power tool 10, and the mounting hole 111 is located above the centerline of the head 142.

In view of fig. 3 to 5, the limiting hole 112 is disposed on the output shaft 17, and the limiting hole 112 and the mounting hole 111 are located at the same height. The limiting hole 112 rotates with the output shaft 17 when the output shaft 17 is driven, and the limiting hole 112 faces the mounting hole 111 and does not face the mounting hole 111 during the rotation process. Also, the limiting hole 112 does not necessarily directly face the mounting hole 111 after the output shaft 17 stops rotating, so the output shaft 17 can make the limiting hole 112 face the mounting hole 111 by rotating the output shaft 17 or the like. In the present embodiment, the limiting hole 112 is actually a slot pattern, that is, the limiting hole 112 in the present embodiment does not penetrate through the output shaft 17. Further, in one embodiment, the center of the limiting hole 112 is offset from the center of the output shaft 17.

On the bearing, the rotation limiting set 113 is disposed in the mounting hole 111, the rotation limiting set 113 includes a bearing frame 114, a limiting bolt 115, and a spring 116, the bearing frame 114 is disposed in the mounting hole 111 and is provided for the limiting bolt 115 to be disposed, the limiting bolt 115 penetrates into the bearing frame 114, one end of the limiting bolt 115 is exposed outside the housing 14, the other end is protruded or received in the bearing frame 114, the spring 116 is disposed in the bearing frame 114 and sleeved on the limiting bolt 115, and two ends of the spring 116 respectively support against the bearing frame 114 and the limiting bolt 115.

Next, referring to fig. 2 to 6, an embodiment of the output shaft rotation restricting structure 11 of the present invention will be described. First, it is assumed that initially, the limiting hole 112 has already faced the mounting hole 111 directly, and the rotation limiting set 113 is not operated. When the limiting bolt 115 is pressed, the limiting bolt 115 presses the spring 116 to make the spring 116 have a resetting force, and at the same time, the limiting bolt 115 is forced to move towards the direction facing the output shaft 17, so that one end of the limiting bolt 115 facing the limiting hole 112 extends into the limiting hole 112, and the output shaft 17 is further limited to rotate. Once the restraining pin 115 is not stressed any more, the spring 116 releases the return force, and the spring 116 pushes the restraining pin 115 to return, so that the restraining pin 115 is displaced away from the output shaft 17, and the output shaft 17 is not interfered by the restraining pin 115 and can rotate freely.

Referring to fig. 1, 4, 8 and 9, when the user intends to replace the grinding member 20, the user changes the holding posture of the grinding machine tool 10, and the holding posture of the thumb corresponding to the output shaft rotation limiting structure 11. Furthermore, the output shaft rotation limiting structure 11 of the present invention can be disposed on the two side surfaces 101 or 102 of the hand-held power tool 10 as viewed from the top, so as to correspond to the dominant hand of the user to hold the hand-held power tool 10 when the user replaces the polishing member 20. For example, if the mounting hole 111 is located on the right side of the extension line 161, i.e., the side 101 of the hand-held power tool 10, the hand-held power tool 10 can be used by a left-handed user, and the left thumb of the user can operate the rotation restricting member 113, as shown in fig. 8. Conversely, when the mounting hole 111 is located on the left side of the extension line 161, i.e., the side 102 of the hand-held power tool 10, the hand-held power tool 10 can be used by a right-handed user and the thumb of the right hand can operate the rotation restricting member 113, as shown in fig. 9. In summary, when the user operates the rotation limiting set 113 to fix the output shaft 17, the user can use a wrench 30 to engage with a groove 172 of the output shaft 17 to fix the position of the wrench 30, and then rotate the wrench 30 to loosen a sleeve 173 at the end of the output shaft 17, thereby removing the grinding member 20 to be replaced. Thereafter, the user inserts a connecting shaft 21 of the polishing element 20 to be mounted into an opening 174 of the sleeve 173 and screws the sleeve 173 to couple the polishing element 20 and the output shaft 17. It should be noted that the grinding member 20 of the present invention can also be directly fixed on the output shaft 17, that is, the assembling method of the grinding member 20 and the output shaft 17 is only for understanding the present invention, rather than limiting the present invention.

Therefore, the utility model discloses a set up this output shaft rotation restriction structure 11 in one of them of this hand-held type machine tool 10 both sides face 101, 102, simultaneously the utility model discloses this output shaft rotation restriction structure 11's extension plane, it is crisscross each other with a drive switch 143's of this hand-held type machine tool 10 extension plane for the user plans to change this grinding member 20 and when changing its gesture of gripping, user's thumb corresponds when placing on this output shaft rotation restriction structure 11 position, four fingers except that user's single hand thumb can not correspond and place on this drive switch 143, and then reduce the user in changing this grinding member 20 and when operating this output shaft rotation restriction structure 11, the condition of mistake touching this drive switch 143 produces. Additionally, the utility model discloses this rotation restriction group 113 is direct to this output shaft 17 to restrict, and does not reach the purpose of interfering this output shaft 17 indirectly through other components, the utility model discloses compare in the conventional use, in case the cooperation pine between other components of conventional use and this output shaft 17 takes off, will lead to this output shaft 17 can't be produced by the condition of restricting really. Furthermore, the utility model discloses this rotatory restriction group 113 can be an independent component, the utility model discloses only need take shape out this mounting hole 111 and this restriction hole 112 on this hand-held type machine tool 10 in the assembling process, directly assemble this rotatory restriction group 113 in this mounting hole 111 in the back, can accomplish the equipment, compare in the conventional use, the utility model has the advantages of change the equipment.

Referring to fig. 1 to 3 again, in an embodiment, the head portion 142 is formed with an opening 144 far from the holding portion 141, and the opening 144 allows the output shaft 17 to be inserted into the head portion 142. Further, the output shaft 17 includes an assembling section 175, a connecting section 176 connected to the assembling section 175, and a limiting section 177 connected to the connecting section 176 and located at the other end of the assembling section 175. The assembling section 175 extends into the opening 144 and is assembled with the head 142, and the assembling section 175 is accommodated in the head 142 after being assembled, and the connecting section 176 is connected to the side of the assembling section 175 not facing the head 142 and extends toward the side of the connecting section 176 away from the head 142, and the side of the connecting section 176 not facing the assembling section 175 is used for engaging with the limiting section 177. The end of the restricting section 177 not facing the connecting section 176 and the end of the assembling section 175 not facing the connecting section 176 together define the length of the output shaft 17. The restricting section 177 is used for assembling the polishing element 20 with the sleeve 173, and the restricting section 177 is assembled with the polishing element 20 and then assembled with the sleeve 173 to restrict the assembling position of the polishing element 20. In one embodiment, the output shaft 17 has a third thread 178 disposed adjacent to the restriction 177, the sleeve 173 has a fourth thread 179 mating with the third thread 178, and the third thread 178 and the fourth thread 179 are assembled to lock the sleeve 173 on the output shaft 17.

On the other hand, referring to fig. 3 and 4, the grinding machine tool 10 further includes a peline group 19 coupled to the output shaft 17, wherein the peline group 19 is used for assisting the rotation of the output shaft 17. In one embodiment, the bearing assembly 19 includes a first bearing 191 and a second bearing 192, wherein the first bearing 191 is connected to a side of the assembly segment 175 facing the head 142, i.e., the first bearing 191 is located above the centerline of the head 142. Also, the second bearing 192 connects the pair of segments 175 on the side of the connecting segment 176, i.e., the second bearing 192 is located below the centerline of the head 142.

On the other hand, referring back to fig. 4, fig. 5 and fig. 7, in an embodiment, the supporting frame 114 of the present invention is a tubular structure, and further, the supporting frame 114 has a first opening 117 and a second opening 118, the first opening 117 is disposed on a side facing the mounting hole 111, the first opening 117 is for the insertion of the limiting pin 115, the second opening 118 and the first opening 117 are located on the same axis, and the second opening 118 is for the penetration of the limiting pin 115 when the force is applied to the limiting pin 115. In yet another embodiment, the support frame 114 of the present invention is assembled to the mounting hole 111, the support frame 114 has a first thread 119 disposed on the exterior, and a second thread 120 engaged with the first thread 119 is disposed in the mounting hole 111, so as to connect the first thread 119 of the support frame 114 and the second thread 120 of the mounting hole 111, so as to lock the support frame 114 to the mounting hole 111. Further, after the supporting frame 114 is assembled to the mounting hole 111, the supporting frame 114 has a first portion 121 disposed in the housing 14 and a second portion 122 exposed outside the housing 14, wherein the first portion 121 is provided with the first thread 119, the first portion 121 is configured to fit the mounting hole 111 and the limiting pin 115 is inserted therein, and the first portion 121 is configured as a hollow cylinder. In addition, the second portion 122 is disposed on the side of the first portion 121 not facing the output shaft 17, and in one embodiment, the cross section of the supporting frame 114 on the second portion 122 is polygonal. Further, in one embodiment, the supporting frame 114 includes a limiting rib 132 disposed on the second portion 122, and the limiting rib 132 prevents the supporting frame 114 from being engaged with the mounting hole 111, thereby limiting the assembling position of the supporting frame 114 and the mounting hole 111.

On the other hand, the limiting latch 115 of the present invention has an operation portion 123, a connection portion 124 and a limiting portion 125, wherein the operation portion 123 is exposed outside the housing 14 after the rotation limiting assembly 113 is assembled in the mounting hole 111, the connection portion 124 extends from the operation portion 123 toward the direction facing the output shaft 17, and the connection portion 124 is disposed in the support frame 114 after the assembly is completed. In one embodiment, the size of the operation portion 123 is larger than that of the connection portion 124, so that a user can conveniently press the operation portion 123 when operating the restriction pin 115. The limiting portion 125 extends from the connecting portion 124 in a direction away from the operating portion 123, the limiting portion 125 is normally disposed in the supporting frame 114, and the limiting portion 125 extends out of the supporting frame 114 when the limiting bolt 115 is stressed, so as to interfere with the limiting hole 112. In one embodiment, the size of the restriction portion 125 is smaller than the size of the connection portion 124.

In view of fig. 4, 5 and 7, in order to prevent the limiting pin 115 from falling off from the supporting frame 114, the connecting portion 124 has a rib 126 capable of abutting against the periphery of the first opening 117, specifically, the rib 126 is disposed on one side of the connecting portion 124 facing the limiting portion 125, when the limiting pin 115 is not stressed and pushed by the spring 116, the rib 126 abuts against the first opening 117, thereby limiting the falling off of the limiting pin 115. Furthermore, the connecting portion 124 has a step connecting surface 127 adjacent to the limiting portion 125, and a guiding inclined surface 128 connecting the step connecting surface 127 and the rib 126, wherein the guiding inclined surface 128 is disposed on the step connecting surface 127 and extends in a direction away from the limiting portion 125, and the guiding inclined surface 128 assists the limiting pin 115 to move along the guiding inclined surface 128 when the limiting pin 115 is assembled with the supporting frame 114. In one embodiment, the side of the rib 126 facing the limiting portion 125 is connected to the guiding slope 128 without step difference. Specifically, after the guiding slope 128 assists the limiting pin 115 to be inserted into the supporting frame 114, the other side of the rib 126 facing the guiding slope 128 forms a stop to limit the limiting pin 115 to be disengaged from the supporting frame 114. In addition, in one embodiment, the bearing frame 114 forms a containing groove 129 facing the limiting pin 115, the rotation limiting set 113 includes a sealing ring 130 disposed in the containing groove 129, the sealing ring 130 contacts the limiting pin 115, and the sealing ring 130 and the limiting pin 115 together limit the lubricating oil coated on the steering gear set 18 from flowing into the bearing frame 114.

Referring back to fig. 2 and 9 to 11, in an embodiment, the output shaft 17 is more stably limited by the output shaft rotation limiting structure 11, the limiting hole 112 of the present invention may be a through hole 131, that is, the limiting hole 112 penetrates through the output shaft 17. In this embodiment, when the rotation limiting set 113 is not under force, the limiting pin 115 does not interfere with the rotation of the output shaft 17, as shown in fig. 10. When the rotation limiting set 113 is forced, the limiting pin 115 is forced to move toward the output shaft 17, and the limiting pin 115 extends into the through hole 131 to interfere with the rotation of the output shaft 17, as shown in fig. 11.

Naturally, the present invention can be implemented in other various embodiments, and various changes and modifications can be made by those skilled in the art without departing from the spirit and the essence of the present invention, but these changes and modifications should fall within the scope of the present invention defined by the appended claims.

Claims (12)

1. An output shaft rotation limiting structure of a hand-held machine tool, the hand-held machine tool comprising a housing, a driving assembly mounted in the housing, a driving shaft disposed in the housing and driven by the driving assembly, and an output shaft disposed in the housing and extending in a direction perpendicular to the driving shaft, the output shaft being mounted with a grinding member, the output shaft and the driving shaft being coupled via a steering gear set, the hand-held machine tool being capable of defining two sides based on an extension line of the driving shaft, the output shaft rotation limiting structure characterized by comprising:

a mounting hole disposed in the housing and located on one of two sides of the hand-held power tool;

a limiting hole, which is arranged on the output shaft and can directly face the mounting hole; and

the rotation limiting set is provided with a bearing frame arranged in the mounting hole, a limiting bolt arranged on the bearing frame and exposed outside the shell, and a spring arranged in the bearing frame and providing a resetting acting force for the limiting bolt, wherein the limiting bolt can extend into the limiting hole to interfere the rotation of the output shaft when being stressed to move towards the output shaft.

2. The output shaft rotation restriction structure of a hand-held power tool according to claim 1, wherein the restriction hole extends through the output shaft.

3. The output shaft rotation restriction structure of a hand-held power tool according to claim 1, wherein a center of the restriction hole is offset from a center of the output shaft.

4. The structure of any one of claims 1 to 3, wherein the holder has a first opening for receiving the restraining pin and a second opening coaxial with the first opening for allowing the restraining pin to pass through.

5. The structure of claim 4, wherein the pin has an operating portion exposed from the housing, a connecting portion extending from the operating portion and located in the holder, and a limiting portion extending from the connecting portion and capable of passing through the second opening, the connecting portion having a rib capable of abutting against the periphery of the first opening to limit the pin from being separated from the holder.

6. The output shaft rotation restriction arrangement of a hand-held power tool according to claim 5, wherein the restriction portion has a size smaller than that of the connection portion.

7. The output shaft rotation restriction arrangement of claim 6, wherein the connecting portion has a stepped connecting surface adjacent to the restriction portion, and a guide slope surface extending away from the restriction portion to connect the stepped connecting surface.

8. The output shaft rotation restriction arrangement of claim 7, wherein the rib is connected to the guide ramp on a side facing the restriction portion without any step difference.

9. The output shaft rotation limitation arrangement of a hand-held power tool of claim 4, wherein the carrier is a tubular structure.

10. The output shaft rotation limitation arrangement of claim 9, wherein the carrier has a first externally disposed thread, and the mounting hole has a second externally disposed thread that mates with the first thread.

11. The output shaft rotation limitation arrangement of claim 10, wherein the carrier has a first portion disposed within the housing and a second portion exposed from the housing, the first thread being disposed on the first portion.

12. The output shaft rotation restriction arrangement of claim 11, wherein the carrier has a polygonal cross-section at the second portion.

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