TWI660822B - Joint fixing structure of hand-held power tool - Google Patents

Abstract

The utility model relates to a joint fixing structure of a hand-held power tool, which comprises a fixing base connected with a tool head. Sliding balls are arranged in the perforations on both sides of the fixing base, and a C-shaped ring is arranged on the outer periphery. There are two convex blocks; a control ring is provided on the outer periphery of the C-shaped ring, which has a circular outer ring surface, and the inner ring surface is provided with two grooves. The control ring can be operated between an unlocked position and a locked position to rotate relative to the C-shaped ring. When the control ring is located in the unlocked position, the groove corresponds to the position of the projection. The C-shaped ring projects into the groove with the projection, and the ball It is not pushed by the C-ring, so that the tool head can pivot freely; when it is in the locked position, the protrusion moves out of the groove and is pushed by the control ring, causing the C-ring to deform the inner clamp and push the ball, so that The ball presses the tool head to fix it.

Description

Joint fixing structure of hand-held power tool

The invention relates to a hand-held power tool, in particular to a joint fixing structure of a hand-held power tool with a swingable joint.

FIG. 9 shows a conventional hand-held power tool, which may be a power tool or a pneumatic tool. The power tool has a main body 5, and a tool head 51 is pivotally arranged at one end thereof, and the pivot can be adjusted relative to the main body 5 to meet the working angle required during actual work. One end of the body 5 near the tool head 51 is provided with a tightening ring 52, which is connected with a rotatable dial 53. After adjusting the pivoting angle of the tool head 51, the dial 53 is operated to dial in the direction of the body 5. It can move the tightening ring 52 toward the inner circle, and then fix the tool head 51 so that it no longer pivots in order to start working.

However, when the user operates the above power tool, he will hold the body 5 with the palm of his hand, and surround the knob 53 for stable operation. Since the knob 53 is formed in a protruding shape on the body 5, the palm cannot be reliably determined. In the case of close contact with the body 5, and gripping the protruding knob 53, it will cause palm pain, which will affect the operation feel and even reduce the work quality. In addition, the protruding knob 53 is not beautiful in the overall appearance of the power tool, and its complicated shape produces a serious sense of incongruity, which is also a place that needs improvement.

In view of this, how to improve the above problems is the primary problem to be solved by the present invention.

The main object of the present invention is to provide a joint fixing structure of a hand-held power tool, which has a simple arc shape on the outside and does not have a structure protruding outward, thereby generating a good operating feel and making the appearance simple and beautiful. .

In order to achieve the foregoing object, the present invention provides a joint fixing structure of a hand-held power tool. The hand-held power tool includes a body and a tool head, and the two are connected by a flexible transmission shaft so that the tool head can be opposite to the tool head. The body is pivoted; the joint fixing structure includes: a plurality of ring grooves provided on a spherical seat of the tool head; a fixed seat embedded in the body, which has a recess for the spherical seat to extend And the spherical seat can be pivoted in the center of the alcove; two opposite sides of the fixed seat are respectively provided with a perforation, and a ball that can slide along the perforation is provided in the perforation; a C-shaped ring that surrounds the fixed seat Outer periphery; the inner periphery of the C-shaped ring is provided with a pressing portion where the ball should be pressed; the outer periphery of the C-shaped ring is provided with a projection, where one side of each bump has A first inclined plane, and two convex blocks are point symmetrical with each other at the center of the C-shaped ring; a control ring having a circular outer ring surface, and the control ring is surrounded by an inner ring surface C-ring outer periphery; the inner A groove is provided on two opposite sides of the annular surface, and each groove has a second inclined surface corresponding to the first inclined surface; the control ring can be operated to rotate relative to the C-shaped ring between an unlocked position and a locked position When the control ring is in the unlocked position, the groove corresponds to the position of the bump, the C-shaped ring is free to protrude into the groove with the bump, and the pressing portion will not push against the ball So that the tool head can pivot freely; when the control ring is in the locked position, the projection moves out of the groove and is pushed by the inner ring surface of the control ring, causing the C-shaped ring to deform the inner clip and The pressing part pushes against the ball, so that the ball is pressed against the annular groove of the spherical seat, thereby fixing the tool head.

In one embodiment, the pressing portion is a metal hard block embedded on the C-ring.

In an embodiment, the fixing seat is provided with a positioning groove, and an inner peripheral surface of the C-shaped ring is provided with a positioning block inserted into the positioning groove.

In an embodiment, a limit groove is provided on the inner ring surface of the control ring, and a limit block protruding into the limit groove is provided on the outer peripheral surface of the C-shaped ring, and the limit block is located on the control ring and is unlocked. Position or the locked position respectively abut one end of the limiting slot.

The above-mentioned objects and advantages of the present invention can be easily understood from the detailed description and accompanying drawings of selected embodiments below.

Please refer to FIGS. 1 and 2, which show the joint fixing structure of the hand-held power tool provided by the present invention, wherein the hand-held power tool mainly has a body 1 and a tool head 11, and the body 1 is connected by a transmission shaft 12 and The tool head 11 is driven, and the transmission shaft 12 has a flexible flexibility. The tool head 11 is pivotally disposed at one end of the body 1, and can be pivoted relative to the body 1 to adjust the working angle. After the pivot angle of the tool head 11 is adjusted, the tool head 11 is fixed by using the joint fixing structure of the present invention for subsequent work.

The present invention includes a fixed seat 2 embedded in the body 1, which has a cavity 21 for the tool head 11 to extend into and connect the drive shaft 12 with a spherical seat 111, wherein the spherical seat 111 can be received in the The alcove 21 is pivoted at the center, and a plurality of ring grooves 112 are arranged on the peripheral surface. A hole 22 is respectively provided at the two opposite positions of the fixing base 2 described above, and a ball 23 is provided in each of the holes 22, and the ball 23 can face the fixing base in the hole 22 when being pushed inward from the outside of the fixing base 2. 2 Move inside.

On the outside, a C-shaped ring 3 is provided on the outer periphery of the fixing seat 2, which is an incomplete ring structure with a gap 31. The fixing base 2 is provided with a positioning groove 24, and the inner peripheral surface of the C-shaped ring 3 is provided with a positioning block 32 (see FIG. 3). The C-shaped ring 3 is inserted into the positioning groove 24 with the positioning block 32 to be fixed and assembled. On the fixing base 2. The C-shaped ring 3 is covered on the outer side of the two perforations 22 and abuts against the ball 23, and the inner peripheral surface of the C-shaped ring 3 is provided with a pressing portion 33 respectively at a place corresponding to the ball 23; in this embodiment, the The inner peripheral surface of the C-shaped ring 3 is provided with two embedded grooves 34, and the pressing portion 33 is a metal hard block embedded in the embedded groove 34, thereby reducing the distance between the C-shaped ring 3 and the ball 23. abrasion.

On the other hand, two protrusions 35 are provided on the outer peripheral surface of the C-ring 3. As shown in FIG. 3, the position of the protrusions 35 corresponds to the pressing portion 33. Each of the bumps 35 has a first inclined surface 351 on one side, and the two bumps 35 are point symmetrical with each other at the center 30 of the C-shaped ring 3.

Furthermore, a control ring 4 is provided on the outer periphery of the C-shaped ring 3, wherein the control ring 4 has a circular outer ring surface 41 and a non-slip texture 411 can be provided, and the control ring 4 has an inner ring surface 42 It surrounds the outer peripheral surface of the C-ring 3. As shown in FIG. 4, a groove 43 is provided at two opposite positions of the inner annular surface 42, and a second inclined surface 431 is provided on one side of each of the grooves 43. The second inclined surface 431 is connected to the first inclined surface. The inclined surface 351 corresponds in shape.

With the above structure, the control ring 4 can be operated to rotate relative to the C-ring 3, thereby controlling the unlocking or locking of the pivot position of the tool head 11. Specifically, when the control ring 4 is turned to an unlocked position as shown in FIG. 5A, the groove 43 of the control ring 4 corresponds to the position of the projection 35 of the C-shaped ring 3. In Fig. 5B, the C-shaped ring 3 naturally expands, so that the projection 35 extends into the groove 43, and the pressing portion 33 will not push inwardly against the ball 23, so that the ball 23 will not be pressed tightly. The spherical base 111 is on the basis of which the tool head can produce free pivoting motion.

In the process of rotating the control ring 4, as shown in FIG. 6, the first inclined surface 351 of the projection 35 and the second inclined surface 431 of the groove 43 are guided and pushed against each other, and the groove 43 and the projection The position of block 35 is gradually staggered and finally comes to the locked position as shown in Fig. 7A. At this time, as shown in FIG. 7B, the projection 35 is pushed by the inner ring surface 42 of the control ring 4 to cause the C-shaped ring 3 to be deformed by the inner clip, and the pressing portion 33 is pushed inward against the The ball 23, the ball 23 is further pressed on the ring groove 112 of the ball seat 111 due to being pushed, so that the pivoting angle of the tool head 11 forms a fixed state as shown in FIG. The ball 23 clamp is fixed and no longer changed, but can be used to perform processing operations.

In this embodiment, as shown in FIGS. 3 and 4, the inner ring surface 42 of the control ring 4 is provided with a limiting groove 44, and the outer peripheral surface of the C-shaped ring 3 is provided with a limiting block 36. The limiting block The 36 series extends into the limit slot 44, and the limit block 36 can move in the limit slot 44 as the control ring 4 rotates. When the control ring 4 is in the unlocked position or the locked position, as shown in Figs. 5A and 7A, the limit blocks 36 respectively abut one end of the limit slot 44 to restrict the rotation of the control ring 4 Scope without overworking.

Through the above description, it can be understood that the present invention uses the rotation of the control ring 4 to switch the unlocking and locking of the tool head 11 pivot position. The user can operate it very easily, so it has a good operating feel. On the other hand, with the shape of the control ring 4 outside, a simple circular arc shape as shown in FIG. 1 is formed on the outside of the present invention as a whole, and it does not have a structure protruding outward, so that the appearance is kept simple and beautiful. .

However, the disclosure of the above embodiments is only used to illustrate the present invention and is not intended to limit the present invention. Therefore, the replacement of equivalent components should still belong to the scope of the present invention.

In summary, those skilled in the art can understand that the present invention can indeed achieve the aforementioned purpose, and it has indeed complied with the provisions of the Patent Law, and filed an application in accordance with the law.

‧‧‧ Ontology

11‧‧‧tool head

111 · ‧‧ spherical seat

112 ‧ ‧ ‧ Gully

12‧‧‧ drive shaft

‧‧‧Fixed

21‧‧‧ Alcove

22‧‧‧ perforation

23‧‧‧balls

24‧‧‧ positioning groove

‧‧‧C-shaped ring

30‧‧‧Circle Center

31‧‧‧ gap

32‧‧‧ positioning block

33‧‧‧Pressing section

34‧‧‧ Recessed

35‧‧‧ bump

351‧‧‧First slope

36‧‧‧ limit block

4‧‧‧control ring

41‧‧‧ outer torus

411‧‧‧Slip Texture

42‧‧‧ inner torus

43‧‧‧ groove

431‧‧‧ second slope

44‧‧‧ limit slot

5‧‧‧ the body

51 · ‧‧tool head

52‧‧‧ Tightening ring

53‧‧‧dial button

Figure 1 is a schematic perspective view of the present invention; Figure 2 is a schematic perspective exploded view of the present invention; Figure 3 is a schematic plan view of the C-ring of the present invention; Figure 4 is a schematic plan view of the control ring of the present invention; Figure 5A is Sectional schematic diagram of the control ring of the present invention in the unlocked position; FIG. 5B is a partially enlarged schematic diagram of FIG. 5A; FIG. 6 is a partially enlarged schematic view of the operating state of the control loop of the present invention; Sectional schematic diagram; FIG. 7B is a partially enlarged schematic diagram of FIG. 7A; FIG. 8 is a schematic sectional diagram of a state where the tool head of the present invention is fixed; and FIG. 9 is a perspective schematic diagram of a conventional hand-held power tool.

Claims (4)

A joint fixing structure for a hand-held power tool. The hand-held power tool includes a body and a tool head, which are connected by a flexible transmission shaft, so that the tool head can pivot relative to the body. The joint fixing structure includes There are: a plurality of ring grooves, which are arranged on a spherical seat of the tool head; a fixed seat embedded in the body, which has a recess for the spherical seat to extend in, and the spherical seat can be in the The central pivot of the alcove; two opposite sides of the fixed seat are respectively provided with a perforation, and a ball which can slide along the perforation is provided in the perforation; ； a C-shaped ring which surrounds the outer periphery of the fixed seat; inside the C-shaped ring A pressing portion is provided on the peripheral surface of the ball, and a bump is provided on the outer surface of the C-ring, and a bump is provided on one side of each of the bumps, and two bumps are provided on the side of the C-ring. The center of the C-shaped ring is point-symmetrical to each other; a control ring having a circular outer ring surface, and the control ring surrounds the outer peripheral surface of the C ring with an inner ring surface; the inner ring A recess is provided on two opposite sides of the torus Each groove has a second inclined surface corresponding to the first inclined surface; the control ring can be operated between an unlocked position and a locked position to rotate relative to the C-shaped ring, when the control ring is located in the unlocked position The groove corresponds to the position of the projection, and the C-shaped ring freely projects into the groove with the projection, and the pressing portion will not push against the ball, so that the tool head can be pivoted freely; When the control ring is in the locked position, the bump moves out of the groove and is pushed by the inner ring surface of the control ring, causing the C-shaped ring to deform the inner clamp and push the ball against the ball with the pressing portion, Then, the ball is forced into the groove of the spherical seat, thereby fixing the tool head. The joint fixing structure of the hand-held power tool according to claim 1, wherein the pressing portion is a metal hard block embedded in the C-ring. The joint fixing structure of the hand-held power tool according to claim 1, wherein the fixing seat is provided with a positioning groove, and the inner peripheral surface of the C-shaped ring is provided with a positioning block inserted into the positioning groove. The joint fixing structure of the hand-held power tool according to claim 1, wherein an inner ring surface of the control ring is provided with a limiting groove, and an outer peripheral surface of the C-shaped ring is provided with a limiting block that projects into the limiting groove, The limit block abuts one end of the limit slot when the control ring is in the unlocked position or the locked position, respectively.