TW202220770A - Adjustable screw-in and screw-out dual-purpose stopper for electric punching drill including a cylinder body, a depth control sleeve, a clutch sleeve, a drive shaft, and a plurality of frusto-conical clutch elements - Google Patents

Abstract

An adjustable screw-in and screw-out dual-purpose stopper for an electric punching drill, which includes a cylinder body; a depth control sleeve screwedly assembled to the lower end of the cylinder body; a clutch sleeve arranged in the cylinder body; a drive shaft penetratingly arranged in the clutch sleeve, and a plurality of frusto-conical clutch elements are arranged between the periphery of the drive shaft and the clutch sleeve. With the structure of the clutch elements, the present invention allows the drive shaft, when it is in the driving position, to effectively clamp drill bits without causing rapid wear of the drill bits, and the drill bits can be quickly screwed out in the clutch position. Through the cylinder body and a spring arranged in the cylinder body, the present invention can effectively offset the punching force and the rotational force; through the depth control sleeve, the present invention can adjust the locking depth of a screw depending on the material of different workpieces. In the present invention, when a screw locked into the workpiece needs to be screwed out, the drill bits push against the screw and then the cylinder body axially moves backwards to the driving position and the electric drill reverses to quickly screw out the screw.

Description

Adjustable screw-in and screw-out dual-purpose stop for impact drill

The present invention relates to a screw driving device, in particular to a stopper used in an electric impact drill to control the depth of the screw being driven into the workpiece and automatically stop the driving when locking the screw to a predetermined depth or withdrawing the screw to a predetermined position.

It is a known art to drive screws with power tools such as electric drills or impact drivers. For example, the ROC Patent No. 098218832 discloses a "power transmission type screw in and out dual-purpose automatic stopper", which works very well for electric drill drives that provide smooth, continuous driving force. However, as the construction industry currently uses longer and longer screws (screw red), electric drills are not very efficient in driving these screws. Therefore, electric drills equipped with impact drivers are used to drive long screws. The impact driver provides the oscillating torque needed to drive long screws, while the screw drive controls the depth of the screw penetration into the workpiece to optimize screw retention.

However, the oscillating effect of the drill with the impact driver can cause the drill's round bearing to break the shank edge of the driver bit that holds it in the drive position. When this happens, the bearing can no longer hold the shank of the bit and cannot turn freely in the drive position. Therefore, the bit must be replaced before the tip of the bit has reached the end of its useful life.

In addition, the "power transmission type screw-in and out-out dual-purpose automatic stopper" disclosed in the Republic of China Patent No. 098218832 cannot efficiently adjust the screw-in depth according to actual needs, or quickly reverse the operation to eject the screw.

Therefore, the object of the present invention is to provide an adjustable screw-in and screw-out stopper for an electric impact drill, which is simple in structure and operation, and does not cause peeling of the edge of the retained bit.

Based on this, the present invention provides an adjustable screw-in and screw-out dual-purpose stopper for an electric impact drill, comprising: a cylindrical body with a cylindrical inner space, the first end of the cylindrical body is formed with external threads, The second end of the cylinder relative to the first end is provided with a cover body; a drive shaft has a drive end, and has a socket end opposite the drive end, the socket end has an annular wall that forms There is a socket extending in the axial direction to receive and retain a bit, the annular wall has a plurality of radial holes communicating with the socket, the radial holes respectively hold a clutch element to engage the driver in a driving position head and disengages the bit in a clutch position, the clutch element is a cylinder with frustoconical ends to engage the bit in the drive position; a clutch sleeve having a top end, a bottom end and a central passage accommodating the drive shaft, the top end of the central passage sized to allow passage of the drive end of the drive shaft but not the socket end of the drive shaft, the clutch sleeve in the central passage The bottom end has an annular groove sized to accommodate the corresponding clutch element when the drive shaft is in the clutched position, such that the frustoconical end of the clutch element disengages the bit but remains in the corresponding Inside the radial hole; a depth control sleeve with internal threads that are helically matched with the external threads of the cylinder to surround the bottom end of the cylinder, the depth control sleeve has a bottom with the screwdriver a channel through which the head extends, the depth control sleeve rotates forward or reverse relative to the barrel to adjust the distance of the bottom of the depth control sleeve relative to the barrel in the direction of the central axis; and a first spring, Its two ends act on the clutch sleeve and the cover respectively to push the clutch sleeve to the driving position.

Preferably, the present invention can further extend between the drive end and the socket end of the drive shaft A retaining ring is arranged, and a second spring is arranged between the retaining ring and the clutch sleeve. The second spring provides the drive shaft with a buffering effect in the direction of the central axis, so as to effectively resolve the axial impact force of the impact drill and the rotational force.

In a preferred embodiment of the present invention, the clutch element may include a rounded outer end to facilitate movement of the clutch element from the clutched position to the drive position.

Preferably, the socket end of the drive shaft of the present invention includes three radial holes spaced 120° apart on the radial plane of the socket end, and the three radial holes are respectively adapted to accommodate a clutch element.

Preferably, the diameter of the bottom of the depth control sleeve of the present invention is smaller than the diameter of the top of the depth control sleeve, so that the bottom of the depth control sleeve is pressed against the workpiece when the locking wire is locked into the predetermined probe.

Preferably, the bottom of the depth control sleeve of the present invention may include a socket surrounding a channel through which the bit extends, the socket receiving and retaining a magnetic element to retain the bit when the drive shaft is in the drive position .

Preferably, the present invention may also include a snap ring groove provided in the bottom of the socket end of the drive shaft, the snap ring groove receiving a snap ring for engagement with the bit by which the snap ring is releasably Hold the driver bit on the socket end of the drive shaft.

Advantages of the present invention include:

1. Since the clutch element is formed into a special frustoconical shape, it can effectively hold the driver bit when it is applied to the impact drill, and will not cause the driver bit to wear quickly and cause drive failure.

2. The present invention can effectively resolve the axial impact force and rotational force of the electric impact drill by setting the spring between the inside of the cylinder and the clutch sleeve, and can utilize the depth control sleeve arranged at the front end of the cylinder. Adjust the length of the front end, and then you can adjust the depth of the screw locking It can meet the needs of different materials or different depths of the workpiece, and the screw head can still be kept flat when locking the screw.

3. The present invention is provided with a magnetic element at the bottom end of the depth control sleeve, which can quickly absorb the screw and improve the working efficiency.

4. In the present invention, when the screw locked into the workpiece needs to be withdrawn, the screw can be quickly withdrawn by pressing the screwdriver bit against the screw, then moving the cylinder axially backward to the driving position and reversing the electric drill.

1: Cylinder

11: External thread

12: Cover

2: Clutch sleeve

20: Center channel

21: Annular groove

3: The first spring

4: Drive shaft

41: socket end

410: Ring Wall

411: Socket

412: Radial hole

42: Drive end

43: Buckle

44: Second Spring

45: Axial hole

46: Ball bearing

47: Clutch element

471: frustoconical inner end

472: Round outer end

473: Cylinder middle section

474: Plane

48: Snap ring groove

49: Snap Ring

5: Magnetic components

6: Depth Control Sleeve

61: Internal thread

62: Bottom

63: Channel

64: Socket

7: screwdriver head

71: Polygonal shaft

72: Groove

8: Screws

H: distance

1 is an external perspective view of a dual-purpose stopper according to the present invention;

FIG. 2 is an exploded perspective view showing the combined relationship of components included in the dual-purpose stopper of the present invention;

FIG. 3 is a plan sectional view showing the structure of the dual-purpose stopper of the present invention, with the drive shaft in the drive position;

FIG. 4 is a plan cross-sectional view showing the drive shaft of the present invention in the clutch position;

5 is a plane cross-sectional view showing that when the dual-purpose stopper of the present invention is about to withdraw from the screw, the screw head is pressed against the screw head and the cylinder body is pulled up to make the drive shaft in the driving position;

6 is a plane cross-sectional view showing that when the dual-purpose stopper of the present invention is about to withdraw the screw to a predetermined height, the clutch element is located in the clutch position to stop continuing to withdraw the screw; and

FIG. 7 is a detailed view showing the clutch element of the present invention.

The embodiments of the present invention will be described in more detail below with reference to the drawings and component symbols, so that those skilled in the art can implement them accordingly after reading the description.

As shown in FIG. 1 to FIG. 3, the present invention provides an adjustable screw-in and screw-out dual-purpose stop The device includes: a cylinder 1 , a clutch sleeve 2 , a first spring 3 , a drive shaft 4 and a depth control sleeve 6 . The cylinder body 1 has a cylindrical inner space, and the first end of the cylinder body 1 is formed with external threads 11, and the second end of the cylinder body 1 opposite to the first end is provided with a cover body 12; The first end of the cylindrical body 1 may also be referred to as the front end, or the top end shown in the drawing, that is, the direction facing the workpiece when the electric drill is operated; the second end of the cylindrical body 1 is opposite to the first end. The direction of the end, which may be called the rear end, or the bottom end as shown in the drawing, is the direction opposite to the workpiece when operating the drill.

The opposite ends of the drive shaft 4 respectively have a socket end 41 and a drive end 42, and the outer diameter of the socket end 41 is larger than the outer diameter of the drive end 42; the socket end 41 is formed with an annular wall 410, the annular wall 410 A socket 411 extending to a depth in the axial direction is formed for accommodating and holding a bit 7, and a plurality of radial holes 412 communicating with the socket 411 are provided on the annular wall 410, preferably the same diameter The facing holes 412 are arranged at 120° intervals on the radial plane of the socket end 41 . Each radial hole 412 accommodates and retains, respectively, a clutch element 47, which is a cylindrical body with frustoconical ends formed to engage the outer diameter of the bit 7 inserted into the socket 411 in an actuated position the surface of the polygonal shaft 71, and disengages the driver bit 7 in a clutch position. An axial hole 45 is formed on the inner bottom surface of the socket 411, and a ball bearing 46 is movably placed in the axial hole 45, so that the ball bearing 46 can roll freely in the axial hole 45. The trailing end is in rolling contact with ball bearings 46 to reduce friction. The inner wall surface of the socket 411 of the drive shaft 4 close to the socket end 41 is also provided with a snap ring groove 48, and a snap ring 49 is arranged in the snap ring groove 48. Groove 72 on the outer diameter for positioning the bit 7 .

The clutch sleeve 2 is a cylindrical body having a top end, a bottom end and a central passage 20 for accommodating the drive shaft 4. The top end of the central passage 20 has a drive end 42 that allows the drive shaft 4 to pass through. A through hole that does not allow the socket end 41 of the drive shaft 4 to pass through; the clutch sleeve 2 has an annular groove 21 on the inner wall surface of the bottom end of the central channel 20, and the annular groove 21 is of a size suitable for driving The drive shaft 4 accommodates the corresponding clutch element 47 when in the clutched position such that the frustoconical end of the clutch element 47 is disengaged from the bit 7 but retained within the corresponding radial bore 412 .

The drive position refers to the position in which the clutch element 47 can be engaged with the bit 7 in which the bit 7 can be driven via the drive shaft 4 . The clutched position refers to the position where the clutch element 47 cannot engage the bit 7 , in which position the bit 7 cannot be driven by the drive shaft 4 .

The diameter of the bottom of the depth control sleeve 6 is smaller than the diameter of the top, and the inner wall of the top has an inner thread 61 that is helically matched with the outer thread 11 of the cylinder body 1 , and the inner thread 61 and the outer thread 11 are helically combined. so that the depth control sleeve 6 surrounds the periphery of the bottom end of the cylinder body 1; the depth control sleeve 6 has a bottom 62, and the bottom 62 has a channel 63 for the bit 7 to pass through. Therefore, when the depth control sleeve 6 is opposite to When the cylinder body 1 is rotating forward, the depth control sleeve 6 can be moved axially forward along the cylinder body 1, so as to adjust the distance of the bottom 62 of the extended depth control sleeve 6 relative to the cylinder body 1 in the direction of the central axis. , that is, the distance H between the bottom 62 and the front end of the bit 7 inserted into the socket 411 is shortened (as shown in FIG. 3 ). When the depth control sleeve 6 is reversed relative to the cylinder body 1, the depth control sleeve 6 can be moved axially backward along the cylinder body 1, thereby adjusting and shortening the bottom 62 of the depth control sleeve 6 in the direction of the central axis The distance H between the bottom 62 and the front end of the bit 7 inserted into the socket 411 is elongated relative to the distance of the cylinder 1 . In addition, the channel 63 of the depth control sleeve 6 extends to the inside to form a socket 64, and a magnetic element 5 is accommodated and held in the socket 64. The magnetic element 5 can quickly attract screws and improve the efficiency of locking screws.

As shown in FIG. 7, each of the clutch elements 47 is the same size and shape. In the preferred embodiment, clutch element 47 is a cylindrical body having a frustoconical inner end 471 and a circular outer end 472 . The cylinder has an overall length "a". The length "b" of the circular outer end 472 is 1/4 (0.25a). The length "c" of the cylindrical mid-section 473 is 1/2a (0.5a); and the frustoconical inner end 471 has a length of 1/4 (0.25a). The diameter of the middle section 473 of the cylinder is 1a (1.0a), frustoconical The diameter "e" of the flat surface 474 of the inner end 471 is 3/4a (0.75a). The radius "r" of the circular outer end 472 is 1/2 a (0.5a). In one embodiment, the total length a of the clutch element 47 is 4 mm, the diameter is 4 mm, and the length a of the cylindrical middle section 473 is 2 mm. The radius of the circular outer end is 2 mm, and the length b of the circular outer end 472 is 1 mm. The frustoconical inner end 471 has a length d of 1 mm and a diameter e of the flat surface 474 of 3 mm. It should be noted that both ends of the clutch element 47 may also be frustoconical.

The first spring 3 is disposed in the inner space of the cylinder body 1, and its two ends act on the clutch sleeve 2 and the cover body 12 respectively, so as to push the clutch sleeve 2 to the driving position. Furthermore, in the present invention, a retaining ring 43 can be further arranged between the driving end 42 of the drive shaft 4 and the socket end 41 , and a second spring 44 can be arranged between the retaining ring 43 and the clutch sleeve 2 . The spring 44 provides the drive shaft 4 with a buffering effect in the direction of the central axis.

The operation mode of the present invention is described as follows:

As shown in FIG. 3 , when the electric drill needs to be rotated forward to lock the screw, first insert the bit 7 through the channel 63 of the depth control sleeve 6 from bottom to top and insert it into the socket 411 of the drive shaft 4 . A spring 3 pushes the clutch sleeve 2 downward so that the clutch element 47 is in the locked position and engages the bit 7, while the snap ring 49 is inserted into the snap ring groove 48 provided on the periphery of the bit 7 to position the bit 7; The depth that the screw is to be locked in. Rotate the depth control sleeve 6 to adjust the distance H between the end of the bit 7 and the bottom 62 of the depth control sleeve 6, and then start the electric drill to rotate to drive the bit 7 to lock the screw 8 into the workpiece , when the screw 8 is locked into the workpiece until the bottom 62 abuts against the workpiece, the depth control sleeve 6 together with the barrel 1 drives the clutch sleeve 2 to move axially relative to the drive shaft 4 to displace the annular groove 21 to the position of the clutch element 47 , so that the clutch element 47 is in the clutch position (as shown in FIG. 4 ), at this time, the bit 7 cannot be driven and stops to continue to lock the screw.

As shown in Figure 5, when it is necessary to reversely rotate the electric drill to withdraw the screw that has been locked into the workpiece, first press the driver bit 7 against the screw head, and then the user holds the cylinder body 1 with his hand and axially moves the cylinder body 1 upward. movement, thereby displacing the clutch element 47 to another locked position below the annular groove 21 (ie The position of the inner wall surface of the clutch sleeve 2 below the annular groove 21 is corresponding to the position of the inner wall of the clutch sleeve 2) to engage the bit 7, and the electric drill can be started to rotate in reverse to drive the bit 7 to withdraw the screw 8 from the workpiece, and the screw 8 will rise during the process of withdrawing from the workpiece. When the screw 8 rises to a predetermined height, the drive shaft 4 also rises, so that the clutch element 47 is displaced to the position of the annular groove 21, so that the clutch element 47 is in the clutch position (as shown in FIG. 6 ), at this time, the bit 7 cannot After being driven, it stops and continues to be driven.

As mentioned above, the present invention is formed into a special frustoconical structure by the aforementioned clutch element 47, so that it can effectively hold the driver bit when it is applied to an electric impact drill, and will not cause the driver bit to wear quickly and cause drive failure. ; And by setting the structure of the second spring 44 between the inside of the cylinder 1 and the clutch sleeve 2, the axial impact force and rotational force of the impact drill can be effectively resolved, and the front end of the cylinder 1 can be used. The depth control sleeve 6 adjusts the length of the front end, and then the depth of the screw locking can be adjusted to meet the needs of different materials or different depths of the workpiece, and the screw head can still be kept flat when locking the screw. In addition, the present invention is provided with a magnetic element at the bottom end of the depth control sleeve, which can quickly absorb the screw and improve the work efficiency. In addition, when the screw that has been locked into the workpiece needs to be withdrawn, the present invention can quickly withdraw the screw by pressing the screwdriver bit against the screw, then moving the cylinder axially backward to the driving position and reversing the electric drill. Efficient.

The above descriptions are only used to explain the preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Therefore, any modification or change of the present invention should be made under the same creative spirit. , all should still be included in the scope of the intended protection of the present invention.

1: Cylinder

4: Drive shaft

41: socket end

42: Drive end

6: Depth Control Sleeve

62: Bottom

Claims (7)

An adjustable screw-in and screw-out dual-purpose stopper for an impact electric drill, comprising: a cylindrical body with a cylindrical inner space, the first end of the cylindrical body is formed with external threads, and the second end of the cylindrical body opposite to the first end is provided with a cover body; a drive shaft having a drive end and a socket end opposite the drive end, the socket end having an annular wall forming a socket extending in an axial direction to receive and retain a chip head, the annular wall The wall has a plurality of radial holes communicating with the socket, the radial holes respectively hold a clutch element to engage the bit in a driving position and disengage the bit in a clutch position, the clutch element is truncated a cylinder with a conical end to engage the driver bit in the drive position; a clutch sleeve having a top end, a bottom end, and a central passage for receiving the drive shaft, the top end of the central passage being sized to allow passage of the drive end of the drive shaft but not to allow passage of the drive shaft The socket end passes through, the clutch sleeve has an annular groove at the bottom end of the central channel, the annular groove is sized to accommodate the corresponding clutch element when the drive shaft is in the clutch position, so that the clutch element is cut off. The tapered end of the head is disengaged from the driver bit but retained in the corresponding radial hole; a depth control sleeve having internal threads that threadedly match the external threads of the barrel to surround the bottom end of the barrel, the depth control sleeve having a bottom with a channel through which the driver bit extends , the depth control sleeve rotates forward or reverse relative to the cylinder to adjust the distance of the bottom of the depth control sleeve relative to the cylinder in the direction of the central axis; and A first spring, two ends of which act on the clutch sleeve and the cover respectively, to push the clutch sleeve to the driving position. Adjustable screw-in and screw-out of the electric impact drill as claimed in claim 1 A stopper, wherein a retaining ring is also provided between the driving end and the socket end of the driving shaft, and a second spring is provided between the retaining ring and the clutch sleeve, and the second spring provides the driving shaft in the center Buffer effect in the axial direction. The adjustable screw-in and screw-out stopper of an electric hammer drill as claimed in claim 2, wherein the clutch element includes a circular outer end so as to facilitate the clutch element to move from the clutch position to the drive position. The adjustable screw-in and screw-out dual-purpose stopper of an electric impact drill as claimed in claim 3, wherein the socket end of the drive shaft includes three diameters spaced 120° apart on a radial plane of the socket end to the hole. The adjustable screw-in and screw-out dual-purpose stopper of an electric impact drill according to claim 4, wherein the bottom diameter of the depth control sleeve is smaller than the top diameter of the depth control sleeve. The adjustable screw-in and screw-out stop of an electric impact drill as claimed in claim 5, wherein the bottom of the depth control sleeve includes a socket surrounding a channel through which the driver bit extends, the socket A magnetic element is accommodated and retained to retain the driver bit when the drive shaft is in the drive position. The adjustable screw-in and screw-out dual-purpose stop of an electric impact drill as claimed in claim 6, further comprising a snap ring groove disposed in the bottom of the socket end of the drive shaft, the snap ring groove receiving A snap ring engaged with the driver bit releasably holds the driver bit at the socket end of the drive shaft by the snap ring.

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