CN115673764A - Reciprocating-rotating switching mechanism and multi-function power tool - Google Patents

Abstract

The invention provides a reciprocating-rotating switching mechanism and a multifunctional power tool. The reciprocating-rotary switching mechanism includes: a cage (3); a rotatable changing plate (21); a first gear assembly (23) mounted on the road changing plate; an output shaft (42) capable of rotating and reciprocating; a second gear (33) fitted on the output shaft (42); changing a road shaft; a third gear (51) fixed to the switching shaft; a reciprocating drive frame (53) connecting the switching shaft (52) and the output shaft (42). When the road changing disc (21) rotates to the rotating position, the first gear assembly (23) is meshed with the second gear (33), so that the output shaft (42) rotates; when the road changing disc (21) rotates to the reciprocating position, the first gear assembly (23) is meshed with the third gear (51), the reciprocating driving frame (53) is driven to swing through the road changing shaft (52), and the reciprocating driving frame (53) drives the output shaft to reciprocate.

Description

Reciprocating-rotating switching mechanism and multi-function power tool

Technical Field

The invention relates to a multifunctional power tool, in particular to an electric tool in the fields of saw cutting, drilling, screw assembling and disassembling and the like.

Background

The reciprocating saw is an electric tool with wide application, and like a common manual saw, the reciprocating saw can saw soft materials such as wood, plastics and the like, and can also saw hard materials such as steel and the like. In order to achieve the purpose of sawing, the output shaft of the reciprocating saw in the prior art only has one reciprocating motion output.

One common drive for reciprocating saws is to connect a rotary input shaft (or crankshaft) and a reciprocating output shaft through an angular bearing (or wobble bearing) and a wobble member, such a drive arrangement being disclosed in chinese patent CN2877933Y, CN103286379A, CN1701914a (which is incorporated herein by reference).

In order to expand the functions of the reciprocating saw, a quick clamping device capable of being arranged on an output shaft of the reciprocating saw is developed, and according to different workpieces, the quick clamping device is used for replacing a saw blade matched with the workpiece, so that the corresponding sawing work can be completed.

In order to further expand the functions of the reciprocating saw, a reciprocating saw with a drilling function is disclosed in the chinese patent CN109048354 a. However, the reciprocating saw adopts the bevel gear set to transmit power, so that the extending directions of the saw blade and the drill bit are required to be vertical, the occupied space is large, and the operation experience is poor.

Disclosure of Invention

In view of the above circumstances, an object of the present invention is to provide a reciprocating-rotating switching mechanism and a multifunctional power tool including the same.

According to a first aspect, the present invention provides a reciprocating-rotary switching mechanism comprising: a cage; a routing disc held by the cage and operable to swivel relative to the cage about a first fixed axis between a reciprocating position and a rotational position; a first gear assembly mounted on the road changing plate, the first gear assembly being drivable to rotate about a central axis of the first gear assembly; an output shaft extending along a second fixed axis, held by the cage, and rotatable about and reciprocatable along the second fixed axis relative to the cage; a second gear which is sleeved on the output shaft; a route changing shaft that extends along a third fixed axis, is held by the holder, and is rotatable about the third fixed axis relative to the holder; a third gear fixedly mounted on the route changing shaft; one end of the reciprocating driving frame is connected to the road changing shaft, and the other end of the reciprocating driving frame is connected to the output shaft; wherein the first, second, third and central axes of the first gear assembly are parallel to and spaced apart from each other; when the switching disc is located at the rotating position, the first gear assembly is meshed with the second gear, and the second gear transmits the rotation of the first gear assembly to the output shaft so that the output shaft rotates around the second fixed axis; when the road changing disc is located at the reciprocating position, the first gear assembly is meshed with the third gear, the third gear transmits the rotation of the first gear assembly to the road changing shaft, the road changing shaft drives the reciprocating driving frame to swing in a reciprocating mode, and the other end of the reciprocating driving frame drives the output shaft to reciprocate along the second fixed axis.

Optionally, an elongated slot is cut in the output shaft extending along the second fixed axis; the second gear is fixedly provided with a pin part, and at least one part of the pin part is embedded into the long-shaped groove and can slide relative to the long-shaped groove. When the road changing plate is located at the rotating position and the first gear assembly rotates, the second gear applies force to the side wall of the long-shaped groove through the pin part so as to drive the output shaft to rotate around the second fixed axis; the second gear is constrained to move relative to the cage along the second fixed axis such that the pin slides reciprocally relative to the elongated slot when the road changing disc is in the reciprocal position and the first gear assembly is rotated.

Optionally, the first fixed axis extends in a front-to-rear direction, and the reciprocating drive rack is located at a front side of the second gear and the third gear; the first gear assembly includes an output gear located on a front side of the drive plate and an input gear located on a rear side of the drive plate and coaxial with the output gear.

Optionally, the elongated slot penetrates the output shaft in a radial direction of the output shaft; the front side of the second gear has a pin fixing cylinder portion, the pin portion passes through the pin fixing cylinder portion in the radial direction and passes through the elongated groove, and the pin portion is fixed to the pin fixing cylinder portion.

Optionally, a positioning element is arranged on the road changing disc, and a positioning groove is arranged on the second gear; when the switching disc is located at the reciprocating position and the second gear is located at the preset angle position, the positioning piece is clamped in the positioning groove to limit the second gear to continuously rotate from the preset angle position.

Optionally, a reciprocating driving sleeve is fixedly sleeved on a predetermined axial position on the output shaft, and a driving head receiving groove is formed in the reciprocating driving sleeve, or a driving head receiving groove is formed in a predetermined axial position on the output shaft; the one end of reciprocal drive rack is registrated through the angular bearing on the shaft of commuting, reciprocal drive rack the other end including inlaying the spherical drive head in the drive head accepting groove, spherical drive head through with spherical drive head fixed connection's linking arm is connected to reciprocal drive rack one end.

Optionally, the output shaft is a stepped shaft with a large diameter portion at the front and a small diameter portion at the rear, a shoulder being formed between the large diameter portion and the small diameter portion; the front end of the reciprocating driving sleeve is abutted against the shaft shoulder, and the rear end of the reciprocating driving sleeve is fixed by a clamp spring sleeved on the small-diameter part of the output shaft.

Optionally, the reciprocating-rotating switching mechanism further comprises a return spring, the return spring is sleeved outside the output shaft, the front end of the return spring abuts against the retainer, and the rear end of the return spring abuts against the reciprocating driving sleeve.

According to a second aspect of the present invention, there is provided a multi-function power tool including: the above-described reciprocating-rotary switching mechanism; a drive arrangement comprising a drive gear, the drive gear having an axis of rotation coincident with the first fixed axis and being in meshing engagement with the first gear assembly; a reciprocating actuator formed at or adapted to be mounted to the output end of the output shaft; and a rotary actuator formed at or adapted to be mounted to the output end of the output shaft.

Optionally, the power tool further comprises: a housing accommodating the holder or integrated with the holder, the housing having a circumferential groove; a switch operating structure extending radially outward from the switch disc through the circumferential groove into or out of the circumferential groove of the housing and being capable of being toggled to move along the circumferential groove to swing the switch disc to the reciprocating position or the rotational position; and a locking mechanism capable of locking the switch operation structure or the switch disc if and only if the switch disc is in the reciprocating position or the rotational position.

Optionally, the drive means comprises a motor; the power tool further comprises a switch assembly and a power supply unit; the power supply unit is a battery, an external power supply or a combination of the battery and the external power supply, and is connected with the motor through the switch assembly; the locking mechanism is further configured to trigger the switch assembly such that the switch assembly allows the power supply unit to supply power to the motor when the locking mechanism is in a locked state in which the switch operating structure or the switch dial is locked, and does not allow the power supply unit to supply power to the motor when the locking mechanism is in an unlocked state in which the switch operating structure is unlocked and the switch dial is unlocked.

Optionally, the locking mechanism comprises a bolt, a bolt spring, a switch pusher dog and a bolt pusher dog, wherein the bolt extends along the direction of the first fixed axis, and the bolt prevents the movement of the switch operating structure by extending into the moving path of the switch operating structure, so as to lock the switch operating structure; the bolt toggle button is fixedly connected with the bolt or the switch pusher dog and can be toggled so as to move the bolt along the direction of the first fixed axis; said bolt spring applying a force to said bolt to place the locking mechanism in said locked condition; the switch pusher dog is fixedly connected with the bolt and used for actuating the switch assembly.

Optionally, a working support is hinged to the lower portion of the front end of the shell, at least two clamping grooves corresponding to different rotation angles of the working support are formed in the shell, and a clamping shaft matched with the clamping grooves is arranged on the working support.

By utilizing the reciprocating-rotating switching mechanism and the multifunctional power tool, the same output shaft can selectively execute rotating motion or reciprocating motion through simple switching operation, different functions can be realized by matching with different executing pieces such as a saw blade, a drill bit, a screwdriver head and the like, and the multifunctional power tool is convenient and safe to use and compact and reasonable in structure.

Drawings

FIG. 1A is a perspective view of a power tool according to an embodiment of the present invention with a saw blade assembled;

FIG. 1B is a perspective view of a power tool with a bit assembly assembled in accordance with an embodiment of the present invention;

fig. 2 is an exploded perspective view of a partial structure of a power tool including a reciprocating-rotary switching mechanism according to an embodiment of the present invention;

fig. 3 is a sectional view of a partial structure of a power tool according to an embodiment of the invention;

FIG. 4A is a cut-away perspective view of the power tool with the output shaft in a forward extending state according to the embodiment of the present invention;

FIG. 4B is a cut-away perspective view of the power tool with the output shaft in a retracted state according to the embodiment of the present invention;

FIG. 5 is a perspective view, partially in section, of the vicinity of a road changing disc of a power tool according to an embodiment of the present invention;

fig. 6 is a partially cut-away perspective view of the vicinity of a working bracket of a power tool according to an embodiment of the present invention.

Detailed Description

Specific embodiments of the present invention will be described below with reference to the accompanying drawings. It is to be understood that the directions of front, rear, up, down, left, right, etc., shown in the drawings and described in the specification and claims are illustrative for the convenience of description and are not intended to limit the scope of the present invention. In addition, in different embodiments and different implementations, the same or similar components and structures will be denoted by the same or similar reference numerals. Features in the examples and embodiments may be combined with each other without conflict, and the latter embodiments may refer to components and structures in the former embodiments.

Fig. 1A and 1B show perspective views of a power tool according to an embodiment of the present invention in a sawing operation state and a drilling operation state, respectively. As shown, the housing 1W of the power tool has a similar profile to a conventional reciprocating saw or drill. The case 1W extends entirely in the front-rear direction, and a main switch 2W is provided at a handle of the case 1W. Alternatively, the casing 1W may be constituted by left and right casing halves. The output shaft 42 projects forward from the front side of the housing 1W and is connected to a saw blade 7W (fig. 1A) as an example of a reciprocating actuator or a power head or a drill bit assembly 8W (fig. 1B) as an example of a rotary actuator. It is understood that the reciprocating actuator can also be an impact head, a cutting head, a reciprocating brush head, a piston head, or other elements for performing reciprocating operations; the rotary actuator may also be a screwdriver bit, a blender bit, a cutting bit, a rotary brush bit, or other element that performs rotary work. As shown in fig. 1 and 2, the reciprocating actuator 7W and the rotary actuator 8W can be attached to the output end (front end) of the output shaft 42 by the quick-clamping device 5W. The quick clamping device 5W may include a quick clamping head 41 (see fig. 2, 3). Alternatively, the reciprocating actuator may be mounted to the output end of the output shaft 42 by screws, by a screw fit, or the like, or may be formed directly on the output end of the output shaft 42 (e.g., forming one or more sets of serrations in the shaft wall of the output shaft and a driver bit at the end of the output shaft).

A power tool according to an embodiment of the present invention includes a reciprocating-rotary switching mechanism. Next, details of the reciprocating-rotary switching mechanism according to the embodiment of the present invention will be described with the aid of the drawings.

FIG. 2 is an exploded perspective view showing a partial structure of the power tool of FIGS. 1A and 1B;

fig. 3 shows a partial structural sectional view of the power tool in fig. 1A, 1B. As shown in fig. 2 and 3, the reciprocating-rotary switching mechanism according to the embodiment of the present invention includes a cage 3, a lane changing plate 21, an output shaft 42, a lane changing shaft 52, a first gear assembly 23, a second gear 33, a third gear 51, a reciprocating drive rack 53, and the like.

The holder 3 holds the route changing plate 21, the output shaft 42, and the route changing shaft 52. Optionally, the holding frame 3 may also participate in holding the second gear 33, the third gear 51, the reciprocating drive frame 53. In this context, the term "hold" may refer to the holding/supporting of the cage 3 directly, or may refer to the holding/supporting of the cage 3 by a bearing or a bushing. In the present embodiment, the holder 3 is constituted by a combination of the headstock 31 and the center mount 32 arranged in the front-rear direction. Alternatively, the cage 3 may also be in one piece or be made of more than two parts. In the present embodiment, the holder 3 is accommodated by the case 1W. Alternatively, the holder 3 may also be integrated with the case 1W (i.e., be a part of the case 1W), or partially served by the case 1W.

As shown in fig. 2, the changing plate 21 can be operated by a user to swivel about a first fixed axis L1 relative to the holder 3 between a reciprocating position and a rotational position (to be described later). In this context, a fixed axis refers to an axis which does not change in positional relationship with the cage 3 in any case.

The first gear assembly 23 is mounted on the road changing plate 21, the first gear assembly 23 being drivable to rotate about a central axis L5 of the first gear assembly 23.

Since the changing tray 21 can revolve around the first fixed axis L1, when the changing tray 21 revolves, the first gear assembly 23 (including the central axis L5 thereof) also makes a corresponding revolution around the first fixed axis L1.

The output shaft 42 extends along its central axis, i.e., the second fixed axis L2, and is capable of rotating about the second fixed axis L2 and reciprocating along the second fixed axis L2 with respect to the cage 3. The second gear 33 is fitted on the output shaft 42. Therefore, the rotation axis of the second gear 33 is also the second fixed axis L2. As described below, rotation of the second gear 33 will cause the output shaft 42 to rotate together, but the second gear 33 does not interfere with the reciprocating motion of the output shaft 42.

The route changing shaft 52 extends along its central axis, i.e., the third fixed axis L3, and is rotatable about the third fixed axis L3 relative to the cage 3. The third gear 51 is fixedly mounted on the switch shaft 52. Thus, the rotational axis of the third gear 51 is also the third fixed axis L3, and rotation of the third gear 51 will drive the shift shaft 52 to rotate together.

As shown in fig. 2, the first fixed axis L1, the second fixed axis L2, the third fixed axis L3 and the central axis L5 of the first gear assembly 23 are parallel to and spaced apart from each other.

The reciprocating drive frame 53 has a lower end connected to the switching shaft 52 and an upper end connected to the output shaft 42.

When the road changing plate 21 is in the rotational position, the first gear assembly 23 is engaged with the second gear 33. At this time, the second gear 33 transmits the rotation of the first gear assembly 23 to the output shaft 42, rotating the output shaft 42 about the second fixed axis L2.

When the switch board 21 is located at the reciprocation position, the first gear assembly 23 is engaged with the third gear 51, and the third gear 51 transmits the rotation of the first gear assembly 23 to the switch shaft 52. At this time, the rotation of the switching shaft 52 drives the reciprocating drive frame 53 to swing back and forth (refer to fig. 4A and 4B), and drives the output shaft 42 to reciprocate along the second fixed axis L2 through the upper end of the reciprocating drive frame 53.

In addition to the reciprocating actuator, the rotary actuator, and the reciprocating-rotary switching mechanism described above, the power tool according to the embodiment of the present invention further includes a driving device. As shown in fig. 2, the drive means comprise a drive gear 11, the rotation axis of which coincides with the first fixed axis L1 and which meshes with the first gear assembly 23.

With the above-described reciprocating-rotating switching mechanism and power tool, the operator can switch between the rotating motion and the reciprocating motion of the same output shaft 42 by simply rotating the switching plate 21 relative to the holder and engaging the first gear assembly 23 selectively with the first gear 33 or the third gear 51. The problems that in the prior art, a power tool is single in function, or has the functions of sawing and drilling, but occupies a large space and is poor in operation experience are solved.

Hereinafter, an alternative embodiment of the present invention will be described with reference to the accompanying drawings.

In one embodiment, as shown in fig. 2, the changing plate 21 may have a cylindrical outer wall that engages with a cylindrical inner wall of the center bracket 32 of the holder 3 with the first fixing axis L1 as a center axis. Optionally, a switch lever 22 is connected to the switch board 21, and the switch lever 22 extends radially outward from the switch board 21 (to facilitate dialing by a user or connection with an operation mode selection dial 4W to be described later). In another embodiment, the lane-changing plate may be engaged with the holder through an inner wall surface of the cylindrical outer wall, or may be rotatably connected to the holder through a center shaft.

In one embodiment, reciprocating drive rack 53 is located forward of second gear 33 and third gear 51, i.e., forward of changing tray 21. First gear assembly 23 may include an output gear 25 located on a front side of swashplate 21 and an input gear 26 located on a rear side of swashplate 21 and coaxial with output gear 25. The input gear 25 meshes with the second gear 33/the third gear 51, and the input gear 26 meshes with the drive gear 11, and transmits the rotation of the drive gear 11 to the output gear 25. Alternatively, the input gear 26 and the output gear 25 may be integrally formed. The gear size, the number of teeth and other parameters of the input gear 26 and the output gear 25 can be designed according to the driving requirements. In other embodiments, the input gear 26 may also be omitted, for example, where the first gear assembly 23 is directly connected to the output shaft of the drive device.

In one embodiment, as shown in fig. 3, an elongated slot 47 is cut in the output shaft 42 extending along the second fixed axis L2. The second gear 33 is fixedly provided with a pin portion (transmission pin) 46 at least a part of which is embedded in the elongated groove 47 and is slidable with respect to the elongated groove 47. When the road changing plate 21 is located at the rotation position and the first gear assembly 23 rotates, the second gear 33 applies a force to the sidewall of the elongated slot 47 through the pin portion 46 to rotate the output shaft 42 around the second fixed axis L2. Further, the second gear 33 is restricted from moving along the second fixed axis L2 relative to the holder 3, so that the pin portion 46 slides reciprocally relative to the elongated groove 47 when the road changing plate 21 is located at the reciprocal position and the first gear assembly 23 rotates. With the above configuration, even if the position of the second gear 33 is kept fixed with respect to the holder 3 (housing 1W), the reciprocating motion of the output shaft 42 is not affected; at the same time, the rotational motion of the second gear 33 can be efficiently transmitted to the output shaft 42.

Preferably, the elongated slot 47 extends through the output shaft 42 in a radial direction of the output shaft 42. The front side of the second gear 33 has a pin fixing cylinder portion 33a, the pin portion 46 passes through the pin fixing cylinder portion 33a in the radial direction and through the elongated groove 47, and the pin portion 46 (at both the upper and lower ends or one of the ends) is fixed (e.g., riveted or screwed) to the pin fixing cylinder portion 33 a. With the above configuration, the second gear 33 can output the rotational force to the output shaft 42 more stably.

In other embodiments, the second gear 33 may be directly fixed to the output shaft 42 and reciprocate following the output shaft 42 as the output shaft 42 reciprocates.

In one embodiment, as shown in fig. 3, the second gear 33 is sleeved on the output shaft 42 in the following manner: the front part of the second gear 33 is sleeved on the output shaft 42 through the pin fixing cylinder part 33a, the rear part of the second gear 33 is sleeved on the output shaft 42 through the bearing 36 and the gear mounting sleeve 34, and the front end of the gear mounting sleeve 34 is provided with a radial flange 35; a portion of the center bracket 32 forms a sleeve portion 32a that is fitted over the gear mounting boss 34 and supports the second gear 33, the sleeve portion 32a restricting forward movement of the gear mounting boss 34 relative to the center bracket 32 by a snap spring or O-ring 37 that is snap fitted on the gear mounting boss 34 and adjacent to a rear surface of the sleeve portion 32 a; the bearing 36 is located between the inner side surface of the second gear 33 and the gear mounting boss 34 in the radial direction; the bearing 36 is located axially between the rear face of the radial flange 35 of the gear mounting sleeve 34 and the front face of the gear mounting sleeve 34. Further, alternatively, the front end of the output shaft 42 is supported by an oil-impregnated bearing 43 directly mounted on the headstock 31.

In other embodiments, the second gear 33 may be sleeved outside the output shaft 42 in other manners. For example, the rear end face of the second gear 33 and the end face of the center bracket 32 opposite thereto may be connected by a thrust ball bearing.

In one embodiment, referring to fig. 2 and 5, a positioning member 24 is provided on the routing disc 21, and a positioning groove 27 is provided on the second gear 33. When the changing plate 21 is located at the reciprocating position and the second gear 33 is located at the predetermined angular position, the positioning member 24 is snapped into the positioning slot 27 to restrict the second gear 33 from rotating further from the predetermined angular position. With the above structure, when the switch board 21 is located at the reciprocating position, the second gear 33 can be fixed at the predetermined angle by the engagement of the positioning member 24 and the positioning slot 27, and further the angle of the output shaft 42 and the reciprocating executing member (such as a saw blade) 7W connected to the output shaft 42 can be fixed, so that the saw blade can be prevented from generating undesirable shaking during the sawing operation.

Preferably, the positioning member 24 is an elastic piece, and, as shown in fig. 5, the positioning groove 27 may be opened on an outer cylindrical surface of a stepped portion 33c between a pin fixing cylindrical portion 33a of the second gear 33 and a gear main body portion (a tooth of the gear is provided on an outer circumferential surface thereof) 33 b. In this way, since the elastic piece has a certain elasticity, even if the switch board 21 has been located at the reciprocating position and the second gear 33 is not rotated in place, the elastic piece temporarily abuts on the outer cylindrical surface of the stepped portion 33c and is elastically deformed. At this time, by the user rotating the reciprocating actuator 7W or the output shaft 42, the second gear 33 will rotate together with the output shaft 42 by the pin portion 46, so that the elastic piece will slide against the outer cylindrical surface of the step portion 33c of the second gear 33 and automatically snap into the positioning groove 27 when the output shaft 42 rotates to a certain angle. Preferably, the elastic piece is bent in a hook shape, and is caught in the positioning groove 27 by the head of the hook.

In other embodiments, for example, a positioning member that can be snapped into the positioning groove 27 may be provided on the route changing lever 22 or the holder 3; or, a positioning part can be arranged on the road changing disc, and a positioning groove matched with the positioning part is arranged on the second gear. Alternatively, the position of the positioning groove may be on the outer cylindrical surface of the pin securing cylinder portion 33a or the end surface of the second gear, and in these cases, the above-described stepped portion 33c may not be provided.

In one embodiment, referring to fig. 2 and 3, a reciprocating drive sleeve 45 is sleeved over the output shaft 42 at a predetermined axial position and a drive head receiving slot 45a is opened in the reciprocating drive sleeve 45. One end of the reciprocating drive frame 53 is fitted over the detour shaft 52 through an angular bearing (not shown), and the other end of the reciprocating drive frame 53 includes a spherical drive head 54 fitted in the drive head receiving groove 45a, the spherical drive head 54 being connected to the one end of the reciprocating drive frame 53 through a connecting arm 55 fixedly connected to the spherical drive head 54. With the above structure, the reciprocating driving sleeve 45 can drive the output shaft 42 to reciprocate by the external force from the spherical driving head 54 without preventing the output shaft 42 from rotating under the driving of the second gear 33.

Preferably, the shaft 52 is a crankshaft. Alternatively, the front end of the switching shaft 52 is supported by the headstock 31 through the oil-retaining bearing 57, and the rear end of the switching shaft 52 is supported by the center bracket 32 through the deep groove ball bearing.

Preferably, the spherical drive head 54 is located on the other side of the output shaft 42 relative to the shunt shaft 52; the spherical driving head 54 is riveted on the reciprocating driving frame 53; the connecting arms 55 are two in number, and surround the output shaft 42 and the reciprocating drive sleeve 45 from the left and right sides.

Preferably, as shown in fig. 3, the output shaft 42 is a stepped shaft having a large diameter portion at the front and a small diameter portion at the rear, and a shoulder 42a is formed between the large diameter portion and the small diameter portion; the front end of the reciprocating driving sleeve 45 abuts against the shaft shoulder 42a, and the rear end is fixed by a snap spring 56 sleeved on the small-diameter part of the output shaft 42.

In other embodiments, the reciprocating drive sleeve 45 may be sleeved over the output shaft 42 in other ways. Alternatively, instead of providing a reciprocating drive sleeve, a drive head receiving slot may be provided at a predetermined location on the output shaft 42 to engage the spherical drive head 54. In addition, other mating connections between the reciprocating drive rack 53 and the shaft 52 and the reciprocating drive sleeve 45 may be used, such as, but not limited to, those disclosed in the prior art references mentioned in the background.

In one embodiment, as shown in fig. 2 and 3, a return spring 44 is mounted around the output shaft 42. The front end of the return spring 44 abuts against the holder 3, and the rear end of the return spring 44 abuts against the reciprocating drive sleeve 45. More specifically, for example, the front end of the return spring 44 abuts against the inner side face of the front end wall of the headstock 31, and the rear end abuts against the front end wall of the reciprocating drive sleeve. By providing the return spring 44, the reciprocating drive sleeve 45 is pushed back by the return spring 44 to the extreme position, i.e., the main plane of the reciprocating drive rack 53 forms the maximum inclination angle toward the rear end, as shown in fig. 4B, at the time of the rotational movement of the output shaft 42 or at the time of the stop of the power tool. With the above structure, when the output shaft 42 drives the drill bit to perform drilling and cutting operations, the third gear 51 can bear recoil during the drilling and cutting operations; when the power tool is stopped, the switching of the working mode is facilitated.

In one embodiment, the power tool according to the present invention further includes a switch operating structure and a locking mechanism 1. The switch operating structure extends radially outward into or out of a circumferential groove 17 (see fig. 1B) on the housing 1W, and can be dialed to move along the circumferential groove 17 to swing the switch disc 21 to the aforementioned reciprocating or rotating position. The lock mechanism 1 can lock the switch operation structure if and only if the switch disc 21 is in the reciprocating position or the rotational position. With the above structure, it is possible to both easily perform the turning of the change disks 21 and lock the change disks 21 by means of the locking of the change operation structure, thereby ensuring that the first gear assembly 23 and the second gear 33 or the third gear 51 remain engaged during the operation.

Alternatively, as shown in the partial perspective view of fig. 5, for the convenience of assembly, the above-described lock mechanism 1 may be composed of a switch lever 22 extending radially outward from the switch plate 21, and an operation mode selection dial 4W mounted on an end of the switch lever 22. The switch lever 22 and the operation mode selection dial 4W may be constructed like a T-shape or a cross-shape to facilitate the user's operation.

In other embodiments, the lock mechanism 1 may also be configured to directly lock the switch board 21 instead of locking the switch board by locking the switch operation structure. In the switch operation structure, the operation mode selection dial 4W may be omitted and the end of the switch operation lever 22 may be used as the dial.

In one embodiment, the driving device of the power tool according to the present invention includes a motor (not shown in the drawings), and the power tool further includes a switch assembly 15 and a power supply unit. The power supply unit is a battery, an external power source or a combination of the two, and is connected with the motor through the switch assembly 15. Wherein the locking mechanism 1 is further configured to trigger the switch assembly 15 such that the switch assembly 15 allows the power supply unit to supply power to the motor when the locking mechanism 1 is in a locked state in which the switch operating configuration or the switch dial 21 is locked, and the switch assembly 15 does not allow the power supply unit to supply power to the motor when the locking mechanism 1 is in an unlocked state in which the switch operating configuration is unlocked and the switch dial 21 is unlocked. With the above structure, it is ensured that the motor can be started only when the first gear assembly 23 has been sufficiently engaged with the second gear 33 or the third gear 51 and is locked in this engaged state, and it is possible to prevent accidental starting of the motor caused by the user mistakenly touching the main switch 2W in the switching process, and to avoid the occurrence of the situation such as gear damage.

Preferably, as shown in fig. 2, the lock mechanism 1 includes a latch 12, a latch spring 13, a latch switch finger 14, and a latch knob 3W (see fig. 1A). Wherein the latch 12 extends along the direction of the first fixed axis L1 (i.e., the front-back direction), and the latch 12 prevents the movement of the switch operating structure by extending into the moving path of the switch operating structure, thereby locking the switch operating structure. A latch knob 3W is fixedly connected to the latch 12 or the switch finger 14 and can be toggled to move the latch 12 in the forward and backward directions. The latch spring 13 applies a force to the latch 12 that extends the latch 12 into the path of travel of the change-over operating structure. A switch finger 14 is fixedly connected to the latch 12 for actuating a switch assembly 15. By utilizing the structure, a user only needs to toggle the bolt toggle button 3W when desiring to switch the motion mode of the operating shaft, and the bolt 12 can be automatically positioned at the position for blocking the movement of the route changing operating structure, namely at the position for locking the route changing disc 21 under the action of the bolt spring 13 in other times, so that the operation is more convenient and safer.

Preferably, the switch assembly 15 is a microswitch. On the housing 1W or on the drive means, a slot or other guide is provided which cooperates with the bolt 12.

Preferably, as shown in fig. 5, notches 22a are provided on both left and right sides of the outer cylindrical surface of the switch lever 22, and the outer cylindrical surface of the plug pin 12 of the lock mechanism 1 can be fitted into the notches 22a of the switch lever 22.

In other embodiments, other ways may be used to activate the switch assembly 15. For example, the switch finger 14 may be omitted, with the latch 12 directly actuating the switch assembly 15; the bolt toggle button 3W can be omitted, and a protruding part is directly arranged on the cylindrical surface of the bolt 12 to be used as a toggle button; the plug pin toggle button 3W which is toggled back and forth can be changed into a toggle button or a button which is toggled left and right; the locking mechanism 1 and/or the trigger switch assembly may be actuated by means of electromagnetic forces.

In one embodiment, as shown in fig. 6, a working bracket 6W is hinged to a lower portion of the front end of the housing 1W. At least two locking grooves 63 corresponding to different rotation angles of the working bracket 6W are provided in the housing 1W, and a locking shaft 65 engaged with the locking grooves 63 is provided in the working bracket 6W. For example, the positions of the two detent grooves 63 correspond to the raised position and the lowered position of the working bracket 62, respectively. When the power tool is matched with the saw blade 7W, the working bracket 62 can be pulled forwards to the lifting position shown in fig. 1A, and the end surface of the working bracket 62 can be abutted against a workpiece, so that the stability of cutting work can be improved and labor is saved; when the power tool is engaged with the drill bit assembly 8W, the working bracket 62 may be pulled downward to the lowered position shown in fig. 1B, at which point the working bracket 62 may be used as a front handle for drilling and cutting operations, achieving the dual purpose of killing two birds with one stone.

Alternatively, as shown in fig. 6, the detent shaft 65 has a certain floatability by being connected to the detent spring 64, so that the detent shaft 65 is moved into the detent groove 63 or out of the detent groove 63 against the spring force when the user applies a proper detent force to the work carrier 6W. Alternatively, the number of the catching grooves 63 may be more than two. In other embodiments, the working bracket 62 may be positioned relative to the housing 1W in other ways.

Alternatively, as shown in fig. 2, for convenience of manufacture and maintenance, the aforementioned changing plate 21, the changing handle 22, the first gear assembly 23, the positioning member (elastic sheet) 24, etc. may be combined into the changing plate assembly 2; the quick chuck 41, the output shaft 42 (including the long groove 47 thereof), the oil-containing bearing 43, the return spring 44, the reciprocating driving sleeve 45 and the like can be combined into the output shaft assembly 3; the aforementioned third gear 51, the shaft 52, the reciprocating drive frame 53 (including the spherical drive head 54 thereof), the oil-containing bearing 57, etc. can be combined into the shaft assembly 5.

An example of the operation of the power tool according to the embodiment of the present invention will be described below with reference to the accompanying drawings.

When the power tool is used for drilling and cutting and needs to be changed into a sawing and cutting operation, the drill bit assembly 8W shown in FIG. 1B is firstly detached from the quick clamping device 5W, an appropriate saw blade 7W is selected to be installed on the quick clamping device 5W, the saw blade 7W is rotated to a vertical position coplanar with the planes of the second fixed axis L2 and the third fixed axis L3, and the working support 6W is adjusted to a lifting position shown in FIG. 1A. Next, the dead bolt dial 3W is pushed backward, the dead bolt 12 is unlocked from the switch lever 22, and the switch unit 15 is turned off. Then, the operating mode selecting dial 4W is turned to the limit position to the left, and the latch dial 3W is released, so that the latch 12 locks the switching lever 22 again under the elastic force of the latch spring 13 and additionally makes the switch assembly 15 in the on-off state. It should be noted that, if the saw blade 7W is not rotated to the position in the previous step, the saw blade 7W may be rotated again at this time, so that the positioning member (elastic piece) 24 is snapped into the positioning slot 27 of the second gear 33.

At the moment, the main switch 2W is pressed, the motor is started, and the output gear 11 of the motor drives the first gear assembly 23 to rotate; the first gear assembly 23 drives the third gear 51 to rotate; the third gear 51 drives the path changing shaft 52 to rotate, the rotating path changing shaft 52 drives the reciprocating driving frame 53 to swing, and the swinging reciprocating driving frame 53 drives the reciprocating driving sleeve 45 through the spherical driving head 54, so as to drive the output shaft 42 to reciprocate; finally, the saw blade 7W is provided with a power for the reciprocating sawing operation.

When the power tool needs to be changed to perform a drilling and cutting operation, first, the saw blade 7W is detached from the quick clamping device 5W, the drill head assembly 8W is mounted on the quick clamping device 5W, and the working bracket 6W is adjusted to the drop position shown in fig. 1B. Next, the dead bolt dial 3W is pushed backward, the dead bolt 12 is unlocked from the switch lever 22, and the switch unit 15 is turned off. Then, the operating mode selecting knob 4W is turned right to the limit position and the latch knob 3W is released, so that the latch 12 locks the switching lever 22 again under the elastic force of the latch spring 13 and additionally makes the switch assembly 15 in the on-off state.

At the moment, the main switch 2W is pressed, the motor is started, and the output gear 11 of the motor drives the first gear assembly 23 to rotate; the first gear assembly 23 drives the second gear 33 to rotate; the second gear 33 drives the output shaft 42 to rotate by pushing the elongated slot 47 through the pin portion 46, and finally provides a power for drilling and cutting the drill bit assembly 8W.

Therefore, the multifunctional power tool of the present invention can selectively perform a rotational motion or a reciprocating motion on the same output shaft 42 by a simple switching operation, and can realize different functions by matching with different actuators such as a saw blade, a drill bit, a driver bit, etc. In addition, the multifunctional power tool is convenient and safe to use; need not to set up a plurality of divided output shafts, compact structure, reasonable.

The foregoing description of certain exemplary embodiments and variations of the present invention has been presented for purposes of illustration and description. However, the foregoing description is not intended to be exhaustive or to limit the invention to the precise form disclosed. It is apparent that various modifications and variations can be made by those skilled in the art. For example, individual features may be arbitrarily combined, substituted, and omitted within the spirit and scope of the present invention. Accordingly, the scope of the invention is to be defined only by the claims appended hereto, and by their equivalents.

Claims (13)

1. A reciprocating-rotary switching mechanism, comprising:

a cage (3);

a routing disc (21) held by the cage (3) and operable to swivel about a first fixed axis (L1) relative to the cage (3) between a reciprocating position and a rotational position;

a first gear assembly (23) mounted on the routing disc (21), the first gear assembly (23) being drivable to rotate about a central axis (L5) of the first gear assembly (23);

an output shaft (42) extending along a second fixed axis (L2), held by the cage (3), and rotatable about the second fixed axis (L2) and reciprocally movable along the second fixed axis (L2) with respect to the cage (3);

a second gear (33) that is fitted on the output shaft (42);

a route-changing shaft (52) that extends along a third fixed axis (L3), is held by the holder (3), and is rotatable about the third fixed axis (L3) relative to the holder (3);

a third gear (51) fixedly mounted on the route changing shaft (52);

a reciprocating drive frame (53) having one end connected to the route changing shaft (52) and the other end connected to the output shaft (42);

wherein the first fixed axis (L1), the second fixed axis (L2), the third fixed axis (L3) and a central axis (L5) of the first gear assembly (23) are parallel to each other and spaced apart from each other;

when the change dial (21) is in the rotational position, the first gear assembly (23) meshes with the second gear (33), the second gear (33) transmits the rotation of the first gear assembly (23) to the output shaft (42), rotating the output shaft (42) about the second fixed axis (L2);

when the changing plate (21) is located at the reciprocating position, the first gear assembly (23) is meshed with the third gear (51), the third gear (51) transmits the rotation of the first gear assembly (23) to the changing shaft (52), the changing shaft (52) drives the reciprocating driving frame (53) to swing in a reciprocating mode, and the other end of the reciprocating driving frame (53) drives the output shaft (42) to move in a reciprocating mode along the second fixed axis (L2).

2. The reciprocating-rotary switching mechanism according to claim 1,

an elongated slot (47) extending along the second fixed axis (L2) is formed in the output shaft (42);

the second gear (33) is fixedly provided with a pin part (46), at least one part of the pin part is embedded in the long-shaped groove (47) and can slide relative to the long-shaped groove (47);

when the road changing plate (21) is located at the rotating position and the first gear assembly (23) rotates, the second gear (33) applies force to the side wall of the long-shaped groove (47) through the pin portion (46) so as to drive the output shaft (42) to rotate around the second fixed axis (L2);

the second gear (33) is constrained to move along the second fixed axis (L2) with respect to the cage (3), so that when the changing disc (21) is in the reciprocating position and the first gear assembly (23) rotates, the pin portion (46) slides reciprocally with respect to the elongated slot (47).

3. The reciprocating-rotary switching mechanism of claim 2,

the first fixed axis (L1) extends in the front-rear direction, and the reciprocating drive rack (53) is located on the front side of the second gear (33) and the third gear (51);

the first gear assembly (23) comprises an output gear (25) located on the front side of the change disc (21) and an input gear (26) located on the rear side of the change disc (21) and coaxial with the output gear (25).

4. The reciprocating-rotary switching mechanism of claim 3,

the long-shaped groove (47) penetrates through the output shaft (42) along the radial direction of the output shaft (42);

the front side of the second gear (33) has a pin fixing cylinder portion (33 a), the pin portion (46) passes through the pin fixing cylinder portion (33 a) and the elongated groove (47) in the radial direction, and the pin portion (46) is fixed to the pin fixing cylinder portion (33 a).

5. The reciprocating-rotary switching mechanism according to claim 2 or 3,

a positioning piece (24) is arranged on the route changing disc (21), a positioning groove (27) is arranged on the second gear (33),

when the switching disc (21) is located at the reciprocating position and the second gear (33) is located at the preset angle position, the positioning piece (24) is clamped into the positioning groove (27) to limit the second gear (33) from rotating continuously from the preset angle position.

6. The reciprocating-rotary switching mechanism according to any one of claims 1 to 5,

a reciprocating driving sleeve (45) is fixedly sleeved at a preset axial position on the output shaft (42), and a driving head receiving groove (45 a) is formed in the reciprocating driving sleeve (45), or a driving head receiving groove is formed at a preset axial position on the output shaft (42);

the one end of reciprocal drive rack (53) is registrated on switching over axle (52) through the angular bearing, the other end of reciprocal drive rack (53) is including inlaying spherical drive head (54) in drive head accepting groove (45 a), spherical drive head (54) through with spherical drive head (54) fixed connection's linking arm (55) be connected to the one end of reciprocal drive rack (53).

7. The reciprocating-rotary switching mechanism of claim 6,

the output shaft (42) is a stepped shaft having a large diameter portion at the front and a small diameter portion at the rear, and a shoulder (42 a) is formed between the large diameter portion and the small diameter portion;

the front end of the reciprocating driving sleeve (45) is abutted against the shaft shoulder (42 a), and the rear end of the reciprocating driving sleeve is fixed by a clamp spring sleeved on the small-diameter part of the output shaft (42).

8. The reciprocating-rotary switching mechanism according to claim 6 or 7,

the reciprocating-rotating switching mechanism further comprises a return spring (44), the return spring (44) is sleeved outside the output shaft (42), the front end of the return spring (44) abuts against the retainer (3), and the rear end of the return spring (44) abuts against the reciprocating driving sleeve (45).

9. A multi-function power tool, said power tool comprising:

the reciprocating-rotary switching mechanism according to any one of claims 1 to 8;

-drive means comprising a drive gear, the rotation axis of which coincides with the first fixed axis (L1) and which meshes with the first gear assembly (23);

a reciprocating actuator (7W) formed at an output end of the output shaft (42) or adapted to be mounted to an output end of the output shaft (42); and

a rotary actuator (8W) formed at an output end of the output shaft (42) or adapted to be mounted to an output end of the output shaft (42).

10. The power tool of claim 9, further comprising:

a housing (1W), wherein the housing (1W) accommodates the retainer (3) or is integrated with the retainer (3), and a circumferential groove (17) is formed in the housing (1W);

a switch operating structure extending radially outwardly from the switch disc (21) through the circumferential groove (17) into or out of the circumferential groove (17) of the housing (1W) and being capable of being toggled to move along the circumferential groove to swing the switch disc (21) to the reciprocating position or the rotational position;

a locking mechanism (1), said locking mechanism (1) being capable of locking said switch operating structure or said switch disc (21) if and only if said switch disc (21) is in said reciprocal position or said rotational position.

11. The power tool of claim 10,

the driving device comprises a motor;

the power tool further comprises a switch assembly (15) and a power supply unit;

the power supply unit is a battery, an external power supply or a combination of the battery and the external power supply, and is connected with the motor through the switch assembly (15);

the locking mechanism (1) is further configured to trigger the switch assembly (15) such that the switch assembly (15) allows the power supply unit to supply power to the motor when the locking mechanism (1) is in a locked state in which the switch operating structure or the switch dial (21) is locked, and the switch assembly (15) does not allow the power supply unit to supply power to the motor when the locking mechanism (1) is in an unlocked state in which the switch operating structure is unlocked and the switch dial (21) is unlocked.

12. The power tool of claim 11,

the locking mechanism (1) comprises a bolt (12), a bolt spring (13), a switch pusher dog (14) and a bolt pusher button (3W), wherein,

the bolt (12) extends along the direction of the first fixed axis, and the bolt (12) blocks the movement of the switching operation structure by extending into the movement path of the switching operation structure so as to lock the switching operation structure;

the bolt toggle button (3W) is fixedly connected with the bolt (12) or the switch pusher dog (14) and can be toggled so as to move the bolt (12) along the direction of the first fixed axis (L1); the bolt spring (13) applies a force to the bolt (12) that places the lock mechanism (1) in the locked state; the switch pusher dog (14) is fixedly connected with the bolt (12) and is used for actuating the switch assembly (15).

13. The power tool according to any one of claims 10 to 12,

the front end lower part of the shell (1W) is hinged with a working support (6W), the shell (1W) is provided with at least two clamping grooves (63) corresponding to different rotation angles of the working support (6W), and the working support (6W) is provided with a clamping shaft (65) matched with the clamping grooves (63).

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