TW201628801A - Screwdriver - Google Patents

Abstract

A screwdriver includes a handle defining a cavity and a slot, a screwdriver head at one end of the handle, a rotation connector rotatably received in the cavity, a spiral rod defining a spiral groove and being rotatably received in the cavity, an operating arm slidably received in the spiral groove with two ends of the operating arm extending from the cavity through the slot, and a first elastic element biased on the operating arm. The screwdriver head is connected to the handle via the rotation connector. The spiral rod can be driven by the operating arm to engage or disengage the rotation connector. When the spiral rod and the rotation connector are combined into an engaged state, the operating arm can slide in the spiral groove toward the screwdriver head to drive the spiral rod and the rotation connector to rotate relative to the handle.

Description

screwdriver

The present invention relates to a screwdriver, and more particularly to a manual push screwdriver.

Conventional screwdrivers typically have a shank, a shank, and a cutter head, the cutter head and the shank being located at opposite ends of the shank, respectively. The user holds a handle to apply a torque to the screwdriver, and the torque is transmitted to the cutter head through the cutter rod, thereby driving the screw to follow the rotation of the cutter head to realize the locking of the screw. The use of such a screwdriver is time consuming and labor intensive, and the screw locking efficiency is low.

A screwdriver includes a shank and a cutter head disposed at a front end of the shank, the shank includes a receiving portion and a limiting slot for communicating the receiving portion with the outside, the receiving portion is built into a screw and a a rotary joint, the cutter head is connected to the shank by a swivel joint, a spiral groove is arranged on the outer wall of the screw rod, an operating arm is inserted into the spiral groove of the screw rod, and the end of the operating arm passes through the limit The positioning arm is protruded out of the accommodating portion, and the operating arm is connected to the shank by a first elastic member, and the operating arm can drive the auger to be coupled or separated from the swivel joint, when the auger is coupled with the swivel joint The operating arm can slide along the spiral groove toward the cutter head and drive the auger and the rotary joint to rotate relative to the shank, thereby driving the cutter head connected to the rotary joint to follow the rotation.

In the embodiment of the invention, the principle of the screw is skillfully utilized to convert the linear motion of the operating arm into the rotary motion of the auger, thereby driving the rotary joint to follow the rotation of the auger to realize the locking of the screw, and the screwdriver is more time-saving and labor-saving. At the same time, the first elastic element applies an elastic force to the operating arm to realize the separation of the auger and the swivel joint at the moment when the screw lock is completed, and prevents the swivel joint from following the revolving of the auger, which can effectively improve the locking of the screw. effectiveness.

FIG. 1 is an assembled, isometric view of a screwdriver according to an embodiment of the present invention.

Figure 2 is an exploded view of the screwdriver of Figure 1.

Figure 3 is an inverted exploded view of the screwdriver of Figure 1.

Figure 4 is a cross-sectional view of the screwdriver of Figure 1 taken along line IV-IV.

Fig. 5 is an enlarged schematic view showing a portion of the screwdriver shown in Fig. 4.

Figure 6 is a cross-sectional view of the screwdriver of Figure 1 in use.

Referring to FIG. 1 , a screwdriver 1 according to an embodiment of the present invention includes a shank 10 and a cutter head 20 disposed at the front end of the shank 10 . An accommodating portion 15 is formed inside the shank 10. The accommodating portion 15 incorporates a swivel joint 30 and a screw shaft 40. The cutter head 20 is coupled to the shank 10 by a swivel joint 30. A spiral groove 42 is formed on the outer wall of the screw shaft 40. A limiting slot 114 is defined in the outer wall 113 of the shank 10. An operating arm 41 is inserted into the spiral groove 42 of the auger 40. The end of the operating arm 41 passes through the limiting slot 114 and protrudes out of the receiving portion 15 . The operating arm 41 is coupled to the shank 10 by a first resilient member 50. The operating arm 41 can drive the swivel joint 30 to rotate by the auger 40.

Referring to FIG. 2-3, the shank 10 includes a body 11 , a connecting cap 12 and a rear cover 13 respectively at opposite ends of the body 11 , and a sleeve 14 sleeved on the body 11 .

The body 11 is a hollow cylinder, and a cavity 115 for receiving the screw shaft 40 is enclosed therein. The opposite ends of the body 11 are provided with openings 111, 112. The body 11 and the connecting cap 12 are connected by threads. The body 11 and the rear cover 13 are connected by threads.

In other embodiments, the body 11 and the connecting cap 12 and the body 11 and the back cover 13 can be detachably connected by other means, such as plugging, snapping, and the like.

The limiting slot 114 is defined on the outer wall 113 of the body 11 for sliding the receiving operation arm 41. In this embodiment, the number of the limiting slots 114 is two, and the two limiting slots 114 are symmetrically distributed with respect to the axial direction of the body 11 . Each of the limiting slots 114 is strip-shaped and extends in the axial direction of the body 11. The length of each of the limiting slots 114 is smaller than the length of the body 11.

The connecting cap 12 is a frustum of a cone whose outer diameter gradually decreases from one end thereof adjacent to the body 11 toward the other end away from the body 11. The connecting cap 12 defines a consistent perforation 121. The through holes 121 penetrate the opposite ends of the connecting cap 12 in the axial direction.

The connecting cap 12 is provided with a stopping portion 122 adjacent to the body 11. The stopper portion 122 includes an annular stopper surface 123 and a fence 124 extending from the outer edge of the stopper surface 123 in the axial direction away from the cutter head 20.

The inner diameter of the stop surface 123 is equivalent to the outer diameter of the body 11. The body 11 has an external thread adjacent to one end of the opening 111. The connecting cap 12 is provided with an internal thread that cooperates with the external thread of the body 11 on the inner wall adjacent to the blocking surface 123.

An internal thread is provided in the opening 112 of the body 11. The rear cover 13 includes a rod body 131 and a head portion 132 at one end of the rod body 131. The outer diameter of the head 132 is larger than the outer diameter of the rod 131. The rod body 131 is provided with an external thread that cooperates with an internal thread in the opening 112.

The sleeve 14 is sleeved on the outer wall 113 of the body 11. The sleeve 14 is provided with two insertion holes 141 for receiving the two ends of the operation arm 41.

The auger 40 is a hollow cylinder. The outer diameter of the auger 40 is smaller than the inner diameter of the body 11. The length of the auger 40 is less than the length of the body 11. The auger 40 is constructed of a rigid material.

A cavity 43 is enclosed in the spiral rod 40. The spiral groove 42 spirally extends from one end of the auger 40 toward the other end around the cavity 43 of the auger 40. The spiral groove 42 forms an oblique angle with the axial direction of the auger 40.

A first bearing 411 and a second bearing 421 are respectively disposed at opposite ends of the auger 40. The first bearing 411 and the second bearing 421 are coupled to the auger 40 by a first connecting pin 412 and a second connecting pin 422, respectively. The first bearing 411 and the second bearing 421 can ensure that the auger 40 is disposed coaxially with the body 11.

A second ratchet 423 is disposed at one end of the auger 40 adjacent to the connecting cap 12. The second ratchet 423 has a pawl provided by the wire guiding cap 12. The second ratchet 423 is coupled to the auger 40 by a second connecting pin 422. The second bearing 421 is interposed between the second ratchet 423 and the second connecting pin 422.

The swivel joint 30 includes a first ratchet 31, a third bearing 32, a third connecting pin 33, a second elastic member 34, a fourth connecting pin 35, and a snap ring 36.

The first ratchet 31 of the swivel joint 30 is disposed adjacent to the auger 40. The first ratchet 31 has a pawl disposed facing the second ratchet 423. The first ratchet 31 can be coupled to the second ratchet 423.

The third connecting pin 33 is detachably connected to the first ratchet 31 after passing through the third bearing 32. The fourth connecting pin 35 is located between the cutter head 20 and the third connecting pin 33.

The fourth connecting pin 35 includes a rod body 351 and a head portion 352 at one end of the rod body 351. The outer diameter of the head 352 is larger than the outer diameter of the rod 351. The fourth connecting pin 35 forms a step 353 at the junction of the rod 351 and the head 352.

The cutter head 20 has a rod shape. The cutter head 20 projects outwardly from the middle portion of the second lug 22. The two lugs 22 are symmetrically disposed on the sidewall of the cutter head 20. The cutter head 20 forms two neck portions 23 at the two lugs 22 and the end portion 21. The outer diameter of each neck portion 23 is smaller than the outer diameter of the end portion 21.

The head 352 of the fourth connecting pin 35 is provided with a recess 354 for receiving the end portion 21 of the cutter head 20. The two sides of the groove 354 further define two notches 355 corresponding to the two lugs 22 of the cutter head 20. The two notches 355 are used to receive the two lugs 22 on the cutter head 20 to prevent the cutter head 20 from rotating relative to the fourth joint pin 35. Further, the fourth connecting pin 35 is provided with two through holes 356 corresponding to the neck portion 23 of the cutter head 20.

The snap ring 36 projects radially inwardly from an end edge of the fourth connecting pin 35 to project an annular retaining edge 361. The inner diameter of the retaining edge 361 corresponds to the outer diameter of the rod body 351 of the fourth connecting pin 35.

Referring to FIG. 4-5, the end portion 21 of the cutter head 20 is first inserted into the recess 354 of the fourth connecting pin 35, and the two lugs 22 of the cutter head 20 are correspondingly received in the notch 355 ( Referring to FIG. 2), the neck portion 23 of the cutter head 20 is exposed through the through hole 356 of the fourth connecting pin 35, and then the second steel ball 24 is inserted into the two through holes 356 of the fourth connecting pin 35, and the card is inserted. The ring 36 is sleeved on the rod body 351 of the fourth connecting pin 35 and slides toward the head 352 until the retaining edge 361 of the snap ring 36 abuts against the step 353 of the fourth connecting pin 35, the two steel balls 24 is respectively abutted between the neck portion 23 of the cutter head 20 and the inner wall of the snap ring 36.

Next, the second elastic member 34 is sleeved on the rod body 351 of the fourth connecting pin 35 and the fourth connecting pin 35 is connected to the third connecting pin 33 by a bolt (not shown). The second elastic member 34 is connected. It is located between the snap ring 36 and the third connecting pin 33. The second elastic member 34 applies an elastic force to the snap ring 36 to prevent the snap ring 36 from sliding toward the third connecting pin 33. At this time, the cutter head 20 is fixedly coupled to the swivel joint 30.

Then, the third bearing 32 and the first ratchet 31 are sequentially disposed in the through hole 121 of the connecting cap 12, and one end of the third connecting pin 33 is sequentially passed through the third bearing 32 and the first ratchet 31, thereby turning the cutter head 20 is attached to the coupling cap 12 of the shank 10.

Further, the body 11 is screwed onto the connecting cap 12, and the second ratchet 423 and the second bearing 421 are connected to one end of the auger 40 adjacent to the connecting cap 12 by a second connecting pin 422, and the first bearing 411 passes the first The connecting pin 412 is connected to the other end of the auger 40 adjacent to the rear cover 13, and then the auger 40 is placed into the cavity 115 of the body 11, and then the first elastic member 50 is sleeved on the body 11, and then the sleeve is sleeved. 14 sleeves are connected to the body 11 , one end of the operating arm 41 is inserted from one side of the shank 10 , and the operating arm 41 sequentially passes through one of the insertion holes 141 of the sleeve 14 and one of the limiting slots 114 of the body 11 , The spiral groove 42 of the auger 40, the other of the limiting grooves 114 of the body 11, and the other of the insertion holes 141 of the sleeve 14 are passed out from the other side of the shank 10.

The sleeve 14 is further provided with a step 142 adjacent to one end of the body 11. The first elastic member 50 is sleeved on the outer wall 113 of the body 11 and located between the connecting cap 12 and the sleeve 14 . The opposite ends of the first elastic member 50 abut against the stopper portion 122 of the coupling cap 12 and the step 142 of the sleeve 14. In this embodiment, the first elastic member 50 is a coil spring, and in other embodiments, other elastic members.

Finally, the rod 131 of the rear cover 13 is screwed into the opening 112 of the body 11, and the head 132 of the rear cover 13 covers the opening 112 of the body 11.

The receiving portion 15 is formed by the body 11 , the connecting cap 12 and the rear cover 13 .

Referring to FIG. 6 , the sleeve 14 is pushed along the axial direction of the body 11 of the shank 10 , and the auger 40 is moved toward the cutter head 20 by the operating arm 41 until the auger 40 abuts on the swivel joint 30 . The two sides of the spiral groove 42 of the 40 are rotated clockwise with respect to the body 11 of the shank 10 under the pressing of the operating arm 41, thereby driving the swivel joint 30 to follow the rotation of the auger 40, and the operating arm 41 is along the spiral groove 42. The top end of the auger 40 slides toward the bottom end.

When the operating arm 41 slides to the bottom of the limiting slot 114, the sleeve 14 abuts the connecting cap 12, and the first elastic member 50 between the sleeve 14 and the connecting cap 12 is deeply compressed, and thus The sleeve 14 exerts a reverse spring force.

Once the thrust applied to the sleeve 14 is removed, the sleeve 14 moves the auger 40 toward the rear cover 13 under the action of the reverse elastic force, so that the screw 40 and the swivel joint 30 are quickly separated at the moment when the locking operation is completed. The auger 40 will continue to move toward the rear cover 13 until the top of the auger 40 abuts against the rear cover 13, and the auger 40 will rotate counterclockwise with respect to the body 11 of the shank 10 under the driving of the operating arm 41. The operating arm 41 is slid along the spiral groove 42 from the bottom end of the auger 40 to the top end, and the first elastic member 50 is elastically deformed to complete one cycle.

Compared with the prior art, the embodiment of the present invention utilizes the principle of the spiral to convert the linear motion of the operating arm 41 into the rotational motion of the auger 40, thereby driving the swivel joint 30 to follow the rotation of the auger 40 to realize the locking of the screw. In combination, the screwdriver 1 is more time- and labor-saving to use. At the same time, the first elastic member 50 applies an elastic force to the operating arm 41 to realize the separation of the auger 40 from the swivel joint 30 at the moment when the screw lock is completed, and prevents the swivel joint 30 from following the swivel joint 30, which is effective. Improve the locking efficiency of the screw.

In addition, in the embodiment of the present invention, the components of the screwdriver 1 are connected by means of detachable connection, and the installation and disassembly are very convenient, and it is convenient to repair or replace the various components. For example, if the cutter head 20 needs to be disassembled or replaced, it is only necessary to push the snap ring 36 toward the third joint pin 33 until the steel ball 24 is completely exposed, then the steel ball 24 is taken out, and the cutter head 20 is removed.

In the embodiment of the present invention, the connecting cap 12 and the rear cover 13 of the screwdriver 1 are separately formed and detachably connected to the body 11. In other embodiments, the connecting cap 12 is integrally formed with the body 11, and the rear cover 13 is separately formed and detachably connected to the body 11; or the rear cover 13 is integrally formed with the body 11, and the connecting cap 12 is separately formed. It is then detachably connected to the body 11.

1‧‧‧ screwdriver

10‧‧‧Knife

11‧‧‧Ontology

12‧‧‧Connecting cap

13‧‧‧ Back cover

14‧‧‧ bushing

15‧‧‧ 容部

20‧‧‧ cutter head

21‧‧‧ End

22‧‧‧ 耳耳

23‧‧‧ neck

24‧‧‧ steel ball

30‧‧‧ swivel joint

31‧‧‧First ratchet

32‧‧‧ Third bearing

33‧‧‧ Third connection pin

34‧‧‧Second elastic element

35‧‧‧fourth connection pin

36‧‧‧Knock ring

40‧‧‧ auger

41‧‧‧Operating arm

42‧‧‧Spiral groove

43, 115‧‧‧ cavity

50‧‧‧First elastic element

111, 112‧‧‧ openings

113‧‧‧ outer wall

114‧‧‧ Limit slot

121, 356‧‧‧through holes

122‧‧‧stops

123‧‧‧stop surface

124‧‧‧ enclosure

131, 351‧‧‧ rods

132, 352‧‧‧ head

141‧‧‧ jack

142, 353‧‧‧ steps

354‧‧‧ Groove

355‧‧ ‧ gap

361‧‧ ‧ rim

411‧‧‧First bearing

412‧‧‧First connection pin

421‧‧‧second bearing

422‧‧‧Second connection pin

423‧‧‧second ratchet

no

1‧‧‧ screwdriver

11‧‧‧Ontology

12‧‧‧Connecting cap

13‧‧‧ Back cover

14‧‧‧ bushing

20‧‧‧ cutter head

21‧‧‧ End

22‧‧‧ 耳耳

23‧‧‧ neck

30‧‧‧ swivel joint

31‧‧‧First ratchet

32‧‧‧ Third bearing

33‧‧‧ Third connection pin

34‧‧‧Second elastic element

35‧‧‧fourth connection pin

36‧‧‧Knock ring

40‧‧‧ auger

41‧‧‧Operating arm

42‧‧‧Spiral groove

43, 115‧‧‧ cavity

50‧‧‧First elastic element

111, 112‧‧‧ openings

113‧‧‧ outer wall

114‧‧‧ Limit slot

122‧‧‧stops

123‧‧‧stop surface

124‧‧‧ enclosure

131, 351‧‧‧ rods

132, 352‧‧‧ head

141‧‧‧ jack

353‧‧‧ steps

361‧‧ ‧ rim

411‧‧‧First bearing

412‧‧‧First connection pin

421‧‧‧second bearing

422‧‧‧Second connection pin

423‧‧‧second ratchet

Claims (10)

A screwdriver includes a shank and a cutter head disposed at a front end of the shank, wherein the shank includes a receiving portion and a limiting slot, and the limiting slot communicates the receiving portion with the outside. A screw shaft and a swivel joint are built in, and the cutter head is connected to the shank by a swivel joint. The outer wall of the screw rod is provided with a spiral groove, and an operation arm is inserted into the spiral groove of the screw rod. The end of the arm passes through the limiting slot and protrudes out of the receiving portion. The operating arm is connected to the shank by a first elastic member, and the operating arm can drive the auger to be coupled or separated from the swivel joint. When the auger is coupled with the swivel joint, the operating arm can slide along the spiral groove toward the swivel joint and drive the auger and the swivel joint to rotate relative to the shank, thereby driving the cutter head to follow the swivel joint and the screw. The screwdriver of claim 1, wherein the swivel joint has a first ratchet disposed facing the auger, the auger having a second ratchet disposed facing the swivel joint, and the auger acts on the swivel joint When the head is on, the pawl of the first ratchet is coupled to the pawl of the second ratchet. The screwdriver of claim 1, wherein the limiting groove is strip-shaped and extends along an axial direction of the shank, and the length of the limiting groove is smaller than the length of the shank. The screwdriver of claim 1, wherein the shank is substantially cylindrical, and a sleeve is sleeved on the outer wall of the shank, and the sleeve has a socket corresponding to the position of the operating arm, and the operating arm protrudes The end of the outlet portion is inserted into the socket of the sleeve. The screwdriver of claim 4, wherein the shank protrudes radially outward from a front end of the shank to extend a stop portion, and the first elastic member is sleeved on the shank, the first The elastic element is located between the sleeve and the stop. The screwdriver of claim 5, further comprising a connecting cap detachably connected to the front end of the shank, the stopping portion being located on the connecting cap. The screwdriver of claim 1, further comprising a rear cover detachably connected to the rear end of the shank away from the cutter head. The screwdriver of claim 1, wherein the swivel joint further comprises a third connecting pin and a fourth connecting pin detachably connected to the third connecting pin, the cutting head sequentially passing through the fourth connecting pin The third connecting pin is connected to the shank. The screwdriver of claim 8, wherein the swivel joint further comprises a snap ring and a second elastic member, wherein the snap ring is used for fixedly connecting the cutter head to the fourth connecting pin, the second elastic The component is sleeved on the fourth connecting pin and located between the snap ring and the third connecting pin, and the two ends of the second elastic component abut against the snap ring and the third connecting pin respectively. The screwdriver of claim 1, wherein the spiral groove extends spirally from one end of the auger to the other end of the auger, and the spiral groove forms an oblique angle with the axial direction of the auger.