WO2019046991A1

WO2019046991A1 - Screwdriver

Info

Publication number: WO2019046991A1
Application number: PCT/CN2017/000622
Authority: WO
Inventors: 孙成纲; 沈佰勇; 马超
Original assignee: 慈溪市诚佳五金工具有限公司
Priority date: 2017-09-05
Filing date: 2017-10-17
Publication date: 2019-03-14
Also published as: DE112017005366B4; CN207901017U; DE112017005366T5; CN108237497B; CN108237497A

Abstract

A screwdriver, comprising a shaft (2) and a handle body (1). A circular protruding ring (12) is provided at the front extremity of the handle body (1). A locking mechanism is provided between the circular protruding ring (12) and the shaft (2). A rotating cover (3) for unlocking the locking mechanism is sleeved on the circular protruding ring (12). The locking mechanism comprises an engaging fitting (4) and an engaging spring (5). An annular section groove (122) is provided at a side of the circular protruding ring (12). The engaging fitting (4) is provided within the annular section groove (122) and can rotate along the annular section groove (122). A grooved engaging position (211) is provided on the exterior of the shaft (2). The screwdriver is structurally reasonable, the shaft (2) and the handle body (1) are firmly connected; tightening force is great, reaches up to 500 N, and complies with European standards; operation is effortless; and, rapid removal and replacement of the shaft can be implemented. In addition, the overall size is reduced when the shaft (2) is removed, thus facilitating packaging and storage.

Description

Screwdriver

Technical field

The invention relates to a screwdriver, in particular to a screwdriver with a detachable cutter bar and a large locking force.

Background technique

As a kind of common hardware, the screwdriver is used to tighten the screws. The existing screwdriver usually includes a handle, a cutter bar and a cutter head. The user rotates the handle to drive the cutter bar and the cutter head to rotate, so that the cutter head drives the screw to rotate to perform the screw. The tightness. At present, the ordinary screwdriver and the handle are generally fixedly assembled and cannot be disassembled, so that it is troublesome to replace the screwdriver. When the screw head is different, it is necessary to equip a plurality of different screwdrivers, which is inconvenient to carry and high in cost. Therefore, there are also many detachable handles on the market, such as magnetic handles, but the drawback is that they are not easy to de-magnetic after a period of time, the cutter head is too short, and the use is too laborious; The disadvantage of the handle is that it is troublesome to screw the nut when it is fixed with a nut, and the head is generally scrapped.

The existing Chinese patent CN101885171A (patent application number 200910051116.7) "a screwdriver handle" includes a handle body, a knife bar and a snap fastener for fixing the cutter head, and the cutter bar is fixed on the handle body, and the card is abutted. The pieces are placed on the arbor. The handle of the screwdriver does not change, and a card offset member is arranged on the knife bar, and different cutter heads can be replaced as needed, but the stability of the structure is not ideal, the cutter bar is easily damaged, affecting the normal use of the screwdriver, and the cutter bar Can not be disassembled to make it bulky, not conducive to packaging storage and carry around.

Also, as the Chinese patent CN203650379U (patent number 201320851021.5) "a screwdriver", comprising a shank and a shank, the shank is detachably connected to the shank by a shank sleeve, and a mounting groove is axially opened at the front end of the shank The rear portion of the shank sleeve is provided with a connecting portion matched with the mounting groove, and the side portion of the shank is provided with a sliding slot hole communicating with the mounting groove, and a locking switch is slidably disposed in the sliding slot hole for locking The bottom of the switch is provided with a flange, and the connecting portion is provided with a limiting slot for engaging with the flange, the shank sleeve is inserted in the mounting groove, and is locked by the cooperation of the limiting slot and the locking switch, and is locked on the left side of the locking switch A return spring is provided between the side and the inner wall of the sliding slot for the locking switch to always slide to the right and the limiting slot to lock. The shank and the shank of the screwdriver can be easily detached, but it is locked by the locking switch and the limiting slot. The locking structure has a locking force that is not large enough to meet the European standard.

Summary of the invention

The technical problem to be solved by the present invention is to provide a screwdriver with a reasonable structure and a larger locking force in view of the above-mentioned state of the art.

The technical solution adopted by the present invention to solve the above technical problem is: a screwdriver including a cutter bar and a handle body, The front portion of the handle body is axially recessed with a handle hole for inserting the rear end of the cutter bar, and a circular convex ring extends at the front end of the handle body, and the rear end of the cutter bar is inserted through the circular convex ring. In the handle hole, a locking mechanism for locking the knife bar is arranged between the circular convex ring and the knife bar, and the circular convex ring is sleeved with a rotating cover for unlocking the locking mechanism; and the feature is:

The locking mechanism comprises a buckle and a snap spring. The side of the circular convex ring of the handle body is provided with a ring groove for the buckle and the snap spring to be inserted, and the ring groove is connected with the handle hole, and the buckle is arranged. In the ring groove, the ring spring can be rotated at a certain angle along the ring groove, and the snap spring is supported between the side of the ring groove and the buckle, so that the buckle has the counterclockwise rotation and the groove of the shank is locked and locked. The trend is that the middle of the arbor corresponding to the buckle is provided with a groove clamping position, the end of the arbor is provided with a guiding chamfer for rotating the buckle, and the inner side of the buckle is convexly provided with a bevel matching the guiding chamfer Protruding, when the cutter bar is inserted, the guide chamfer pushes the buckle bevel protrusion, so that the buckle rotates clockwise against the buckle spring thrust. When the cutter bar is inserted into the handle hole, the buckle is pushed into the cutter groove by the buckle spring thrust. The card position is such that the groove latching position closely abuts the inner slope of the buckle.

Preferably, the handle hole is a square hole, and the rear end of the arbor is a square rod with a corresponding square cross section.

Preferably, the buckle and the snap spring are two sets of rotationally symmetrically arranged, and the circular convex ring is symmetrically opened with two ring segment slots, and one side of the ring segment slot is a chute for the snap insertion and sliding The other side is a spring slot for the snap spring to be inserted. The side of the buckle is convexly provided with a spring column for the snap spring. The holder groove is four, which is symmetrically arranged in the middle of the square rod. Four corners.

Preferably, the rotating cover is a hollow cap-like structure that cooperates with a circular convex ring of the handle body, and a convex snap ring is formed on the outer circumference of the inner end of the circular convex ring, and the stepped surface of the snap ring and the handle body is formed. A limiting block is arranged between the inner wall of the rotating cover and an annular recess corresponding to the snap ring. The upper part of the annular recess has a matching limiting groove. The rotating cover is sleeved on the circular convex ring and can be circularly convex. Ring limit rotation.

Preferably, the outer surface of the buckle is longitudinally provided with a rib, and the inner wall of the rotating cover is longitudinally provided with a groove corresponding to the rib of the buckle, and when the rotating cover rotates clockwise, through the groove and the convex The fit of the rib pushes the buckle to rotate clockwise against the elastic force of the snap spring, so that the beveled projection of the buckle is disengaged from the groove of the cutter bar.

Preferably, the outer side of the handle body and the circular convex ring are provided with an OPEN rotating arrow solid mark for easy operation.

Preferably, the bottom of the handle hole of the handle body is concavely provided with a spring hole for positioning the spring, the spring is inserted in the spring hole, and the head of the spring extends out of the spring hole to abut the tail end of the arbor to make the knife The rod has a tendency to always pop outward.

Preferably, the handle body is a unitary piece formed by overmolding, and a tail hole is provided at a tail portion of the handle body.

Preferably, the front end of the cutter bar is provided with a cutter head, and the cutter head and the cutter bar are integrally formed by overmolding.

Preferably, the groove latch has a slope matching with the bevel protrusion.

The advantages of the present invention over the prior art are:

The shank and the handle body are both integral parts of the overmolding, not only the structure is firm, but also the insulation is flame retardant;

The front end of the handle body is provided with a circular convex ring, and two sets of buckles and snap springs are arranged on the circular convex ring, and the groove of the groove is matched with the snap-fit locking groove, and the driving is set on the circular convex ring. The rotating cover of the buckle rotates, when used, as long as the rotary cover is rotated clockwise, the buckle can be rotated to disengage the buckle from the cutter bar;

A spring is arranged in the handle hole, and as long as the buckle is disengaged from the cutter bar, the cutter bar will be quickly ejected by the spring to facilitate replacement;

The structure of the invention is reasonable, and the cutter bar and the handle body are not only firmly connected, but also have a large locking force, can reach >500N, meet the European VDE standard, and the operation is labor-saving, and the quick removal and replacement of the cutter bar can be realized;

In addition, after the arbor is disassembled, the overall volume is reduced, which is advantageous for packaging and storage, and has strong practical performance.

DRAWINGS

1 is a schematic structural view of an embodiment of the present invention;

Figure 2 is an axial cross-sectional view showing an embodiment of the present invention;

Figure 3 is an exploded perspective view of Figure 1;

Figure 4 is a cross-sectional view of the embodiment of the present invention after being transversely cut at the rotary cover;

FIG. 5 is a schematic structural view of a shank and a snap fit in an embodiment of the present invention; FIG.

FIG. 6 is a schematic structural view of a rotating cover and a circular convex ring of a handle according to an embodiment of the present invention.

Detailed ways

The invention will be further described in detail below with reference to the embodiments of the drawings.

1 to 6, a preferred embodiment of the present invention. The screwdriver includes a cutter bar 2 and a handle body 1.

Wherein, the front portion of the handle body 1 is axially recessed with a handle hole 11 for inserting the rear end of the arbor 2, the handle hole 11 is a square hole, and the rear end of the shank 2 is a corresponding square with a square cross section. The rod 21 is provided with a reduced diameter circular ring 12 at the front end of the handle body 11, and the square rod 21 of the shank 2 is inserted into the handle hole 11 through the circular convex ring 12, and the circular convex ring 12 and the knife A locking mechanism for locking the knife bar 2 is disposed between the rods 2. The circular convex ring 12 is sleeved with a rotating cover 3 for unlocking the locking mechanism. The bottom of the handle hole 11 is recessed with a spring hole 13 and a spring hole 13 A spring 6 is inserted therein, and the spring 6 is inserted into the spring hole 13. The head of the spring 6 protrudes from the spring hole 13 to abut against the tail end of the shank 2, so that the shank 2 has a tendency to always eject outward, and the shank 2 using a square rod with a square cross section;

The locking mechanism includes two sets of buckles 4 and a snap spring 5 which are arranged in a rotationally symmetric manner. The side of the circular convex ring 12 of the handle body 1 is symmetrically opened with two rings for the buckle 4 and the snap spring 5 to be inserted. One side of the ring groove 122, one side of the ring groove 122 is a sliding groove 123 for the buckle 4 to be inserted and slid, and the other side is a spring groove 124 for the snap spring 5 to be inserted, the chute The 123 is connected to the handle hole 11 , and the buckle 4 is disposed in the sliding slot 123 and can slide along the sliding slot 123 . The side of the buckle 4 is convexly provided with a spring post 43 for the snap spring 5 to be sleeved. The four corners of the middle portion of the square rod 21 are correspondingly provided with four groove latching positions 211. The inner side of the buckle 4 is convexly provided with a beveled protrusion 41 for locking the knife bar 1 in cooperation with the groove latching position 211, and the groove latching position The 211 also has a slope with the inclined protrusion 41. When the shank 2 is inserted into the handle hole 11 in position, the groove latch 211 closely contacts the inclined protrusion 41, and the snap spring 5 is supported by the spring groove 124 and the buckle 4. Between the two, the buckle 4 has a tendency to always rotate counterclockwise and cooperate with the groove latch 211 of the shank 2;

In addition, the inner end of the square rod 21 of the cutter bar 2 is provided with a matching guide chamfer 23, which cooperates with the bevel projection 41, and the guide buckle 4 can be adjusted when the cutter bar is inserted until the buckle 4 finally can follow the square shape. The surface of the rod 21 slides toward the cutter head, slides to the position of the groove latch 211, and the buckle 4 is engaged by the snap spring 5, and snaps into the groove latch 211 to lock the cutter rod 2;

The rotating cover 3 has a hollow cap-like structure that cooperates with the circular convex ring 12 of the handle body 1. The outer periphery of the circular convex ring 12 is formed with a convex snap ring 121, and the step of the snap ring 121 and the handle body 11 A limiting block 125 is disposed between the faces. The inner wall of the rotating cover 3 is provided with a corresponding annular recess 31. The upper part of the annular recess 31 is provided with a matching restricting groove 32. At the lower end of the annular recess 31, a plurality of card points are circumferentially convex. The rotating cover 3 is disposed on the circular convex ring 12 by a snap sleeve and can be rotated around the circular convex ring 12 . The outer surface of the buckle 4 is longitudinally provided with a rib 42 , and the inner wall of the rotating cover 3 is longitudinally disposed on both sides. There is a groove 33 matched with the rib 42 of the buckle 4, and the rotating cover 3 drives the buckle 4 to rotate by the cooperation of the groove 33 and the rib 42. When the rotating cover 3 rotates clockwise, the buckle 4 is pushed to overcome the card. The spring force of the buckle spring 5 rotates clockwise, so that the beveled projection 41 of the buckle 4 is disengaged from the groove latching position 211 of the cutter bar 2, and the cutter bar 2 is pushed by the spring 6 in the handle body 1, thereby realizing the cutter bar 2 from Separating the handle body 1;

For convenience of operation, an OPEN rotating arrow solid mark 15 for easy operation is provided on the outer side of the handle body 1 and below the circular convex ring 12. The rotating cover 3 is provided with an uneven surface for facilitating hand rotation, and the handle body 1 is The outer part of the handle body 1 is provided with a hanging hole 14 at the tail end of the handle body 1. The front end of the knife bar 2 is provided with a cutter head 22, and the cutter head 22 and the cutter bar 2 are integrally formed by overmolding, which is not only very structurally Strong and flame retardant.

During installation, the spring 6 is inserted into the handle hole 11, and the two sets of the buckle 4 and the snap spring 5 are inserted into the ring groove 122 of the circular convex ring 12 of the handle body, and the rotary cover 3 is aligned with the buckle 4 and The circular convex ring 12 is pressed in, so that the rib 42 of the buckle 4 enters the groove 33 of the rotating cover 3, and finally the shank 2 is inserted into the handle hole 11 of the assembled handle body 1, and the square rod of the shank 2 The inner end guide chamfer 23 of the 21 is engaged with the bevel projection 41, and the guide buckle 4 can be adjusted in position so that the buckle 4 can slide along the surface of the square rod 21 toward the cutter head, and when the cutter bar 2 is inserted into the end, the card is inserted. The buckle 4 slides to the position of the groove latching position 211, so that the groove latching position 211 is aligned with the beveled projection 41 of the buckle 4, and the buckle 4 engages the beveled projection 41 into the grooved card under the action of the snap spring 5 The shank 2 is locked in position 211.

When the shank 2 needs to be replaced or the shank 2 is detached, as long as the rotating cover 3 is rotated clockwise according to the OPEN rotating arrow stereo mark 14, the buckle 4 is rotated against the elastic force of the snap spring 5, so that the slanting of the buckle 4 is convex. The handle 41 is disengaged from the groove latching position 211 of the cutter bar 2, and the cutter bar 2 is automatically ejected under the action of the spring 6, thereby realizing the separation of the cutter bar 2 from the handle body 1, which is very convenient to operate, and in addition, due to the groove of the cutter bar 2 The card position 211 has a slope, which is high near the side of the spring, so that the buckle cannot be rotated in the direction of the spring, so that the pulling force of the knife bar 2 can be increased, the locking force is improved, and the screwdriver is more convenient and reliable to operate.

The above description is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make several improvements and retouchings without departing from the technical principles of the present invention. It should also be considered as the scope of protection of the present invention.

Claims

A screwdriver comprising a cutter bar (2) and a handle body (1), the front portion of the handle body (1) is axially recessed with a handle hole (11) for inserting a rear end of the cutter bar (2), A circular convex ring (12) extends at the front end of the handle body (1), and the rear end of the shank (2) is inserted into the handle hole (11) through the circular convex ring (12), and the circular convex ring (12) is provided with a locking mechanism for locking the knife bar (2) with the knife bar (2), and the circular convex ring (12) is sleeved with a rotating cover (3) for unlocking the locking mechanism;

The utility model is characterized in that the locking mechanism comprises a buckle (4) and a snap spring (5), and a side of the circular convex ring (12) of the handle body (1) is provided with a buckle (4) and a card. a ring groove (122) into which the spring (5) is inserted, the ring groove (122) communicates with the handle hole (11), and the buckle (4) is disposed in the ring groove (122) and can be along the ring groove (122) rotating at a certain angle, the snap spring (5) is supported between the side of the ring groove (122) and the buckle (4), so that the buckle (4) has always rotate counterclockwise and the cutter bar (2) The groove card position (211) matches the tendency of locking;

The middle of the knife bar (2) is provided with a groove latching position (211) corresponding to the position of the buckle (4), and the end of the knife bar (2) is provided with a guiding chamfer for rotating the buckle (4);

The inner side of the buckle (4) is convexly provided with a beveled protrusion (41) which cooperates with the guide chamfer. When the cutter bar (2) is inserted, the guide chamfer pushes the buckle (4) the beveled projection (41) to make the buckle (4) Overcoming the snap spring (5) thrust clockwise rotation, when the cutter bar (2) is inserted into the handle hole (11) in place, the buckle (4) is pushed into the cutter bar (2) by the snap spring (5). The slot card position (211) causes the groove latching position (211) to closely abut the inner bevel projection (41) of the buckle (4).
The screwdriver according to claim 1, characterized in that the handle hole (11) is a square hole, and the rear end of the arbor (2) is a square rod (21) having a square cross section.
The screwdriver according to claim 2, wherein the buckle (4) and the snap spring (5) are two sets of rotationally symmetrically arranged, and the circular convex ring (12) is symmetrically opened with two ring segments. One side of the groove (122) and the ring groove (122) is a sliding groove (123) for the buckle (4) to be inserted and slid, and the other side is a spring groove for the snap spring (5) to be inserted (124) ), the side of the buckle (4) is convexly provided with a spring post (43) for the snap spring (5), and the groove latching position (211) is four, symmetrically arranged in the middle of the square rod (21) Four corners.
A screwdriver according to claim 3, characterized in that the rotary cover (3) has a hollow cap-like structure that cooperates with a circular convex ring (12) of the handle body (1), and a circular convex ring (12) a protruding snap ring (121) is formed on the outer periphery of the inner end, and a limiting block (125) is disposed between the snap ring (121) and the step surface of the handle body (1), and the inner wall of the rotating cover (3) is provided with The corresponding annular recess (31) of the snap ring (121) has a matching restricting groove (32) at the upper portion of the annular recess (31), and the rotating cover (3) is sleeved on the circular convex ring (12) by a snap ring It can be rotated around the circular convex ring (12).
The screwdriver according to claim 4, characterized in that: the outer surface of the buckle (4) is longitudinally provided with a a rib (42), a groove (33) corresponding to a rib (42) of the buckle (4) is longitudinally disposed on both sides of the inner wall of the rotary cover (3), and when the rotary cover (3) rotates counterclockwise, Through the cooperation of the groove (33) and the rib (42), the buckle (4) is rotated clockwise against the elastic force of the snap spring (5), thereby realizing the bevel protrusion (41) of the buckle (4) and the arbor (2) The groove latch (211) is disengaged.
A screwdriver according to any one of claims 1 to 5, characterized in that the outer side of the handle body (1) and the circular convex ring (12) are provided with an OPEN rotating arrow solid mark (15) for easy operation. ).
A screwdriver according to any one of claims 1 to 5, characterized in that the bottom of the handle hole (11) of the handle body (1) is recessed with a spring hole for positioning the spring (6). The spring (6) is inserted into the spring hole (13), and the head of the spring (6) protrudes from the spring hole (13) to abut against the tail end of the arbor (2), so that the arbor (2) has always The trend of popping out.
A screwdriver according to any one of claims 1 to 5, characterized in that the handle body (1) is a unitary piece formed by overmolding, and a hanging hole is provided at the tail of the handle body (1) (14) ).
A screwdriver according to any one of claims 1 to 5, characterized in that the front end of the cutter bar (2) is provided with a cutter head (22), and the cutter head (22) and the cutter bar (2) pass twice. Injection molding forms a unitary piece.
A screwdriver according to any one of claims 1 to 5, characterized in that the groove latching (211) has a slope with the beveled projection (41).