TWM574547U - Connection head fixing structure for 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 connecting the tool head, wherein the two sides of the fixing seat are provided with a slidable ball, and a C-shaped ring is arranged on the outer circumference thereof, and the outer circumference of the C-shaped ring is arranged There are two bumps; a control ring is arranged on the outer circumference of the C-shaped ring, and has a circular outer annular surface, and the inner annular surface is provided with two grooves. The control ring is operable to rotate relative to the C-ring between an unlocked position and a locked position. When in the unlocked position, the groove corresponds to the position of the bump, and the C-ring extends into the groove with the bump, the ball It is not pushed by the C-shaped ring, so that the tool head can be pivoted freely; when it is in the locked position, the bump moves out of the groove and is pushed by the control ring, so that the C-ring generates deformation of the inner clip and pushes the ball, thereby making The ball is forced to the tool head to fix it.

Description

Handheld power tool joint fixing structure

This creation relates to hand-held power tools, and in particular to a joint fixing structure of a hand-held power tool with a swingable joint.

Figure 9 shows a conventional hand-held power tool, which can be a power tool or a pneumatic tool. The power tool has a body 5, and one end of the power tool is pivotally provided with a tool head 51 to adjust the pivoting posture relative to the body 5 to meet the working angle required in actual work. The body 5 is disposed near one end of the tool head 51 and is provided with a tightening ring 52 connected to a pivotable knob 53. After the adjustment of the pivoting angle of the tool head 51 is completed, the dial 53 is operated to dial the body 5 In this case, the tightening ring 52 can be driven to the inner ring bundle, thereby fixing the tool head 51 so that it is no longer pivoted to start working.

However, when the user operates the power tool, the body 5 is gripped by the palm of the hand and surrounded by the button 53 for stable operation. Since the button 53 is formed on the body 5 to form a protrusion, the palm cannot be confirmed. The close contact with the body 5, and the gripping of the protruding button 53 can cause pain in the palm, thereby affecting the handling feel and even lowering the work quality. In addition, the protruding button 53 is not aesthetically pleasing in the overall appearance of the power tool, and its complicated shape causes a serious sense of discomfort, which is also an improvement.

In view of this, how to improve the above problems is the primary issue that the creative office wants to solve.

The main purpose 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 an outwardly protruding structure, thereby generating a good operating feel and making the appearance simple and beautiful. .

For the purpose of the foregoing, the present invention provides a joint fixing structure for a hand-held power tool, the hand-held power tool including a body and a tool head, which are connected by a flexible drive shaft so that the tool head can be opposed to the tool head The joint fixing structure comprises: a plurality of annular grooves disposed on a spherical seat of the tool head; a fixing seat embedded in the body, having an alcove for the spherical seat extension And the spherical seat can be pivoted in the recess; the opposite sides of the fixed seat are respectively provided with a through hole, wherein the through hole is provided with a ball slidable along the through hole; a C-shaped ring surrounding the fixed seat The outer circumference; the inner circumference of the C-shaped ring is respectively provided with a pressing portion facing the ball; the outer circumference of the C-shaped ring is respectively provided with a convex portion facing the pressing portion, and one side of each convex block has a first inclined surface, and the two convex blocks are point-symmetric with each other at the center of the ring of the C-shaped ring; a control ring having a circular outer annular surface, and the control ring is surrounded by the inner annular surface Outside the C-ring; the inside The two opposite sides of the torus are respectively provided with a groove, each groove has a second inclined surface corresponding to the first inclined surface; the control ring is operable to rotate between an unlocked position and a locked position relative to the C-shaped ring When the control ring is in the unlocked position, the groove corresponds to the position of the bump, and the C-shaped ring is free to protrude into the groove with the protrusion, and the pressing portion does not push the ball The tool head is freely pivotable; 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, so that the C-ring generates deformation of the inner clip. The ball is pushed against the ball, and the ball is pressed against the ring groove of the ball seat, thereby fixing the tool head.

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

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

In an embodiment, the inner ring surface of the control ring is provided with a limiting slot, and the outer peripheral surface of the C-shaped ring is provided with a limiting block extending into the limiting slot, and the limiting block is located at the control ring. The position or the locked position respectively abuts one end of the limiting slot.

The above objects and advantages of the present invention are not to be understood in detail from the detailed description and the accompanying drawings.

Please refer to the figures 1 and 2, which are shown in the joint fixing structure of the hand-held power tool provided by the present invention. 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 drive shaft 12 has a bendable flexibility, and the tool head 11 is pivotally disposed at one end of the body 1 so as to be pivotable relative to the body 1 to adjust the working angle. After the adjustment of the pivoting angle of the tool head 11 is completed, the tool head 11 is fixedly constructed using the joint of the present invention for subsequent work.

The present invention includes a fixing base 2 embedded in the body 1 and having an recess 21 for the tool head 11 to extend into and connect with the transmission shaft 12, wherein the spherical seat 111 can be The recess 21 is pivoted and has a plurality of annular grooves 112 on its circumferential surface. The two opposite positions of the fixing base 2 are respectively provided with a through hole 22, and each of the through holes 22 is provided with a ball 23, and the ball 23 can face the fixing seat in the through hole 22 when receiving the thrust inward from the outer side of the fixing base 2. 2 inside movement.

The outer periphery of the fixing base 2 is provided with a C-shaped ring 3 which is an incomplete annular structure having a notch 31. The fixing seat 2 is provided with a positioning groove 24, and the inner circumferential surface of the C-shaped ring 3 is provided with a positioning block 32 (see FIG. 3). The C-shaped ring 3 is embedded in the positioning groove 24 by the positioning block 32 to be fixedly assembled. On the fixing base 2. The C-shaped ring 3 is wrapped on the outer side of the two through holes 22 and abuts against the ball 23, and the inner circumference of the C-shaped ring 3 is respectively provided with a pressing portion 33 facing the ball 23; in this embodiment, the The inner circumferential surface of the C-ring 3 is provided with two cavities 34, and the pressing portion 33 is a metal slab embedded in the cavities 34, thereby reducing the gap between the C-ring 3 and the ball 23. abrasion.

On the other hand, the outer peripheral surface of the C-shaped ring 3 is provided with two projections 35. As shown in Fig. 3, the position of the projections 35 corresponds to the pressing portion 33. One side of each of the bumps 35 has a first inclined surface 351, and the two convex blocks 35 are point-symmetric with each other at the center 30 of the ring of the C-shaped ring 3.

Furthermore, a control ring 4 is disposed on the outer circumference of the C-shaped ring 3, wherein the control ring 4 has a circular outer surface 41 and an anti-slip pattern 411 is provided, and the control ring 4 has an inner annular surface 42. Surrounds the outer circumference of the C-ring 3. As shown in FIG. 4, a recess 43 is defined in each of the two opposite positions of the inner ring surface 42. One side of each recess 43 has a second slope 431. The second slope 431 is associated with the first The slope 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 pivoting position of the tool head 11. In detail, when the control ring 4 is rotated to an unlocked position as shown in FIG. 5A, the groove 43 of the control ring 4 corresponds to the position of the bump 35 of the C-ring 3, and the reference is made at this time. 5B, the C-ring 3 is naturally opened, so that the protrusion 35 extends into the groove 43, and the pressing portion 33 does not push the ball 23 inward, so that the ball 23 is not forced to On the spherical seat 111, the tool head can thereby generate a free pivoting motion.

In the process of rotating the control ring 4, as shown in FIG. 6, the first inclined surface 351 of the bump 35 and the second inclined surface 431 of the groove 43 are mutually guided against each other, and the groove 43 and the convex portion The position of the block 35 is gradually staggered and eventually comes to the locked position as shown in Fig. 7A. At this time, as shown in FIG. 7B, the bump 35 is pushed by the inner annular 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 inwardly. The ball 23, which is further urged by the thrust force on the annular groove 112 of the spherical seat 111, causes the pivoting angle of the tool head 11 to form a fixed state as shown in Fig. 8, which is The ball 23 is fixed and does not change, and can be used to perform a machining operation.

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 slot 44. The outer peripheral surface of the C-shaped ring 3 is provided with a limiting block 36. The 36 series extends into the limiting slot 44, and the limiting block 36 can move in the limiting 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 limiting block 36 respectively abuts one end of the limiting slot 44, thereby limiting the rotation of the control ring 4. Range without over-operation.

Through the above description, it can be understood that the creation system uses the rotation of the control ring 4 to switch the unlocking and locking of the pivoting position of the tool head 11. The user can operate it very easily, and thus has a good operating feel. On the other hand, by the outer shape of the control ring 4, the outer portion of the present creation is integrally formed with a simple circular arc shape as shown in Fig. 1, and has no outwardly protruding structure, so that the appearance is kept simple and beautiful. .

However, the above description of the embodiments is merely illustrative of the present invention and is not intended to limit the present invention. Therefore, the replacement of equivalent elements should still be within the scope of the present invention.

In summary, it can be made clear to the skilled person that the creation can achieve the aforementioned objectives, and it has already met the requirements of the Patent Law and submitted an application according to law.

1‧‧‧ Ontology

11‧‧‧Tool head

111‧‧‧ spherical seat

112‧‧‧Circle

12‧‧‧Drive shaft

2‧‧‧ Fixed seat

21‧‧ ‧ alcove

22‧‧‧Perforation

23‧‧‧ ball

24‧‧‧ positioning slot

3‧‧‧C-ring

30‧‧‧ Ring Center

31‧‧‧ gap

32‧‧‧ Positioning block

33‧‧‧Resistance Department

34‧‧‧Inlay

35‧‧‧Bumps

351‧‧‧First bevel

36‧‧‧Limited blocks

4‧‧‧Control loop

41‧‧‧ outer annulus

411‧‧‧Anti-skid lines

42‧‧‧ Inner torus

43‧‧‧ Groove

431‧‧‧second slope

44‧‧‧Limited slot

5‧‧‧Ontology

51‧‧‧Tool head

52‧‧‧Hoops

53‧‧‧ dial

The first picture is a three-dimensional schematic diagram of the creation; the second picture is a three-dimensional exploded view of the creation; the third picture is a schematic plan view of the C-shaped ring of the creation; the fourth picture is a schematic plan view of the creation control ring; The schematic diagram of the creation control ring is located at the unlocked position; FIG. 5B is a partial enlarged view of FIG. 5A; FIG. 6 is a partial enlarged view of the action state of the creation control loop; FIG. 7A is the creation control ring at the locked position Fig. 7B is a partial enlarged view of Fig. 7A; Fig. 8 is a schematic cross-sectional view showing the state in which the creation tool head is fixed; Fig. 9 is a perspective view of a conventional hand-held power tool.

Claims (4)

A joint fixing structure for a hand-held power tool, the hand-held power tool comprising a body and a tool head, the two of which are connected by a flexible drive shaft for pivoting the tool head relative to the body; the joint fixing structure comprises There is: a plurality of annular grooves disposed on a spherical seat of the tool head; a fixing seat embedded in the body, having an alcove for the spherical seat to protrude, and the spherical seat is The opposite side of the fixed seat is respectively provided with a through hole, wherein the through hole is provided with a ball which can slide along the through hole; a C-shaped ring surrounds the outer periphery of the fixed seat; inside the C-shaped ring Each of the C-shaped rings is provided with a pressing portion at a position facing the ball; the C-shaped ring is respectively provided with a convex portion facing the pressing portion, and one side of each of the convex blocks has a first inclined surface and two convex portions The center of the ring of the C-shaped ring is point-symmetric with each other; a control ring having a toroidal outer annular surface, and the control ring surrounds the outer circumferential surface of the C-shaped ring with an inner annular surface; a concave surface on each of the opposite sides of the torus a groove, each groove having a second slope corresponding to the first slope; the control ring being operable to rotate relative to the C-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 protrusion, and the C-shaped ring is freely protruded into the groove by the protrusion, and the pressing portion does not push against the ball, so that the tool head can be pivoted freely; When the control ring is in the locked position, the protrusion moves out of the groove and is pushed by the inner ring surface of the control ring, so that the C-shaped ring generates deformation of the inner clip and pushes the ball against the ball by the pressing portion. The ball is then forced into the annular groove of the spherical seat, thereby securing 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 on the C-shaped 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 circumferential 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 the inner ring surface of the control ring is provided with a limiting slot, and the outer peripheral surface of the C-shaped ring is provided with a limiting block extending into the limiting slot. The limiting block abuts one end of the limiting slot when the control ring is in the unlocked position or the locked position.