Automatic screwdriver guide

Abstract

Guide protrusions of the automatic screwdriver guider are all inclined planes or cambered surfaces with the upper surfaces inclining downwards, each guide protrusion is composed of an upper first guide protrusion, a lower first guide protrusion, an upper second guide protrusion and a lower second guide protrusion from top to bottom, and an olive-shaped first gap channel is defined by the first guide protrusions of the same step. Second gap channels with the middles being round and the two ends being provided with acute-angle notches are defined between the second guide protrusions of the same step, the tip ends of the first gap channels and the tip ends of the second gap channels are located on the same plane, and the vertical projections of the second gap channels are concentrically located in the first gap channels. And a screw pre-storage area is formed between the lower second guide bulge and the outlet of the guide channel. When a relatively short round head screw is pressed out of the guider by a screwdriver head, the screwdriver head and a nut edge can be accurately butted, so that the screw tightening device can be conveniently locked, the structure is simple, and the effect is stable.

Description

Technical Field

[0001] The utility model relates to the field of screw tightening devices, in particular to an automatic screwdriver guide. Background Art

[0002] The applicant applied for ZL201721231620.1 in 2017, entitled "A screw clamp for automatically correcting screws". The screw clamp can use at least two levels of left and right springs as guiding structures to jointly correct the springs and the screwdriver head, so that the screw slot is accurately connected to the screwdriver head when the pressing action is completed. During the process, the clamp does not open and the screw does not fall sideways.

[0003] For relatively short round-head screws with thread lengths between two and three times the nut diameter, it's difficult for the spring element on the pressing side to fully retract during the guiding process of the screwdriver's jaws. Therefore, designs that leave relatively little room for the spring element to retract can result in the screw becoming obliquely engaged within the guide structure due to insufficient spring retraction. Existing screwdriver guides that utilize left- and right-handed jaws for expansion are susceptible to the screw falling sideways along the expanded guide channel due to the large discrepancy between the opening amplitude and the screw size, causing the screwdriver bit to spin idly. Summary of the Invention

[0004] The utility model aims to provide an automatic screwdriver guide, which can accurately connect the screwdriver head and the nut blade to facilitate the locking of the screw tightening device, and has a simple structure and stable effect.

[0005] In order to achieve the above purpose, the present invention adopts the following technical means to implement:

[0006] The screwdriver guide comprises left and right guide members that can be opened and closed with respect to each other, wherein the left and right guide members enclose a guide channel, wherein the guide channel is provided with a plurality of guide protrusions, and a guide space is formed between two adjacent steps of the guide protrusions. The screwdriver moves vertically back and forth along the guide channel, the screwdriver head moves downward to close the screw supply channel outlet above the guide protrusion, and the screwdriver head moves upward to connect the screw supply channel with the guide channel. The guide protrusions are all inclined surfaces or arc surfaces with downward inclination on the upper surface. The guide protrusions are composed of upper and lower first guide protrusions and upper and lower second guide protrusions from top to bottom. The first guide protrusions of the same step enclose a first olive-shaped gap channel, and the second guide protrusions of the same step enclose a second gap channel with a circular middle part and acute-angled notches at both ends. The tips between each first gap channel and each second gap channel are located in the same plane, and the vertical projections of the second gap channels are concentrically located in the first gap channel. A screw pre-storage area is formed between the lower second guide protrusion and the guide channel outlet.

[0007] Furthermore, the relative guiding surface of the guiding protrusion is at least partially curved.

[0008] Furthermore, the relative guiding surfaces of the upper and lower first guiding protrusions are arcuate surfaces that shrink from the middle to the tips on both sides.

[0009] Furthermore, the relative guiding surfaces of the upper and lower second guiding protrusions are arcuate surfaces extending from the middle to the edges of the acute-angled notches on both sides.

[0010] Furthermore, the lower surface of the guide protrusion is an upwardly inclined slope, an upwardly inclined arc surface, or a horizontal surface.

[0011] Furthermore, at least a portion of the screw pre-storage area is an inclined surface or an arc surface that gradually shrinks from top to bottom.

[0012] Furthermore, a guide hole is provided between the lower portion of the screw pre-storage area and the outlet, and the guide hole is cylindrical, or conical, or arc-shaped, which shrinks from top to bottom.

[0013] Furthermore, the screw pre-storage area is provided with a guide section, which shrinks from the middle to both sides, and the tip of the guide section is located in the same plane as the tip of each first gap channel and the tip of each second gap channel.

[0014] Furthermore, the left and right guide members are axially connected to the base, and the left and right guide members are opened and closed along the rotation axis to separate the guide channels.

[0015] Furthermore, the screw supply channel is provided on the base, and the screw supply channel outlet leads to the inner channel of the base, and the screwdriver moves vertically back and forth along the inner channel of the base toward the guide channel.

[0016] Furthermore, a magnetic component is provided in the base, and the magnetic component is provided adjacent to the screwdriver head.

[0017] The utility model has at least the following benefits:

[0018] 1. By aligning the upper and lower first guide protrusions and the upper and lower second guide protrusions within the left and right guide members, the round head screw is gradually guided along the first and second gap channels as it is pushed out of the guide by the screwdriver head. In particular, if the round head screw deviates significantly to the side, it can be guided along the first and second gap channels step by step.

[0019] 2. By providing the screw pre-positioning area and the guide cut surface, when guiding a round head screw with a screw portion close to three times the diameter of the nut, the screw portion moves down to the screw pre-positioning area. The guide cut surface can guide the longer round head screw along the guide cut surface as it falls toward the exit, preventing the round head screw from accidentally falling out of the gap between the left and right guide pieces.

[0020] 3. A guide hole is set between the lower part of the screw pre-storage area and the outlet, which can better match the edge of the round head screw, so that the nut of the round head screw can be hung in the guide hole. After the left guide and the right guide are opened to each other, the nut and the guide hole can be separated from each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the utility model;

[0022] Figure 2 It is a half-section schematic diagram of the utility model;

[0023] Figure 3 This is a schematic diagram of a half-section of the screwdriver head of the utility model in another direction;

[0024] Figure 4 This is a schematic AA cross-sectional view of the first guide protrusion of the present invention;

[0025] Figure 5 BB is a schematic cross-sectional view of the second guide protrusion of the utility model;

[0026] Figure 6 It is a CC cross-sectional schematic diagram of the guide hole of the utility model. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the utility model for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention. Example

[0028] like Figure 1-6As shown, an automatic screwdriver guide includes a left guide member 11 and a right guide member 12 axially connected to a base 2 and rotatable along a rotating shaft and driven to open and close by a driving structure. A screw supply channel 3 is provided on the base 2, and the screw supply channel outlet leads to a channel 20 in the base. A guide channel is formed between the left guide member 11 and the right guide member 12, and the screwdriver reciprocates vertically along the channel 20 in the base toward the guide channel. An upper first guide protrusion 111, a lower first guide protrusion 112, an upper second guide protrusion 121, and a lower second guide protrusion 122 are provided in the guide channel from top to bottom. Each guide protrusion has a downwardly inclined upper surface and a horizontal lower surface. A guide space is formed between two adjacent step guide protrusions.

[0029] The upper first guide protrusions 111 are enclosed to form an upper first gap channel 110, and the lower first guide protrusions 112 are enclosed to form a lower first gap channel, and the shapes of the upper first gap channel 110 and the lower first gap channel in vertical projection are as follows: Figure 4 The guide surfaces of the upper first guide protrusion 111 and the lower first guide protrusion 112 are in the form of arc surfaces that shrink from the middle to the tips on both sides;

[0030] The upper second guide protrusions 121 enclose an upper second gap channel 120, and the lower second guide protrusions 122 enclose a lower second gap channel, and the upper second gap channel 120 and the lower second gap channel are both shaped as follows in vertical projection: Figure 5 The middle portion is generally rounded, and the two ends are sharp-angled notches, and the relative guiding surfaces of the upper second guide protrusion 121 and the lower second guide protrusion 122 are notched arc surfaces extending from the middle portion to the edges of the sharp-angled notches on both sides;

[0031] The olive-shaped upper first gap channel 110, the lower first gap channel, the upper second gap channel 120, which is circular in the middle and has sharp-angled notches at both ends, and the lower second gap channel have their tips located in the same plane. Through this arrangement, as the screw portion of the round head screw moves downward step by step in the guide channel, the tips of the upper first gap channel 110 and the lower first gap channel can guide the direction of the screw portion toward the tips of the upper second gap channel 120 and the lower second gap channel.

[0032] A screw pre-storage area 13 is formed between the lower second guide protrusion 122 and the guide channel outlet. The guide channel outlet is larger than the screw part diameter but smaller than the screw head diameter. Therefore, when the left guide member 11 and the right guide member 12 are not unfolded to each other, the round head screw can be hung on the guide channel outlet.

[0033] When in use, the screwdriver head 30 is driven by the motor to rotate and move vertically back and forth along the guide channel. The screwdriver head 30 moves downward to close the screw supply channel outlet above the guide protrusion, and the screwdriver head 30 moves upward to connect the screw supply channel 3 and the guide channel, so that the screws can enter the guide channel through the screw supply channel 3 in sequence. The round head screw used in this embodiment has a screw length of two to three times the diameter of the round head screw, and the diameter of the round head screw is larger than the olive-shaped vertical projection of the upper first gap channel 110 and the lower first gap channel. The shortest spacing is about 0.2mm, and the height of the guide space is not less than the height of any guide protrusions on both sides and not less than the thickness of the screw cap. During the round head screw moves downward along the guide channel toward the outlet, the left guide member 11 and the right guide member 12 swing along the rotating shaft and synchronously open relative to the base 2. The screwdriver head 30 rotates and drives the round head screw to rotate and move from top to bottom along the upper first gap channel 110, the lower first gap channel, the upper second gap channel 120, the lower second gap channel, and the screw pre-storage area 13, and is finally adsorbed by the screwdriver head 30 and sent out along the outlet.

[0034] This embodiment adopts a scheme in which the relative guiding surface of the guide protrusion is at least partially curved, which can reduce wear between the round head screw and the relative guiding surface during the guiding process. In addition, the relative guiding surfaces of the upper first guide protrusion 111 and the lower first guide protrusion 112 are preferably curved surfaces that taper from the middle to the tips on both sides. When the screwdriver guide is placed with the outlet downward and the round head screw does not move coaxially downward along the centerline of the guide channel, when the lower end of the screw portion or the side edge of the nut contacts the upper surface or relative guiding surface of the upper first guide protrusion 111 and the lower first guide protrusion 112, the screwdriver head 30 pushes the nut to more easily guide the round head screw to self-align due to the surface inclination, guiding the round head screw to slide into the guide channel in the direction of the lower guide protrusion. In this process, because the upper first gap channel 110 and the lower first gap channel are both olive-shaped in vertical projection, the screw portion is more likely to slide into the guide channel in the direction of the lower guide protrusion with the lower end of the screw portion facing the tip.

[0035] When the round head screw passes through the upper first gap channel 110 and the lower first gap channel and moves toward the outlet, and does not move down coaxially along the center line of the guide channel, the lower end of the screw portion contacts the upper surface of the upper second guide protrusion 121 and the lower second guide protrusion 122, which is also more likely to guide the screw portion to self-align due to the surface inclination; and based on the primary guidance of the tip of the upper first gap channel 110 and the tip of the lower first gap channel, the lower end of the screw portion moves toward the tip of the first gap channel and along the tip of the upper second gap channel 120 and the tip of the lower second gap channel. At this time, due to the upper second gap The shapes of the tips of the gap channel 120 and the lower second gap channel in vertical projection are both circular in the middle and sharp-angled notches at both ends, and the positions of the two sharp-angled notches in vertical projection are located within the area of ​​the vertical projection of the olive-shaped part. Therefore, under the push of the screwdriver head 30 on the nut, the screw part will move along the two sharp-angled notches with smaller space and be guided, so that the round head screw moves coaxially downward toward the outlet along the center line of the guide channel. At this time, under the attraction of the magnetic screwdriver head 30 on the nut, the round head screw can move along the direction of the target hole position and spirally lock the target hole position.

[0036] Furthermore, in this embodiment, in order to enhance the magnetic adsorption force of the screwdriver head 30, a magnetic ring column 21 is provided in the base, and the magnetic ring column 21 is adjacently sleeved outside the screwdriver head 30. Through this arrangement, the overall magnetic strength of the screwdriver head 30 can be further increased.

[0037] In this embodiment, the solution of setting the lower surface of the guide protrusion to be a horizontal plane can effectively shorten the vertical distance of the guide space, thereby reducing the overall height of the guide; of course, the vertical distance of the guide space can be further shortened by modifying the lower surface of the guide protrusion to be an upwardly inclined slope or an upwardly inclined arc surface. This solution is more suitable for use with round head screws with thinner screw nuts.

[0038] Preferably, in this embodiment, the middle of the screw pre-storage area 13 is provided with an arc surface that gradually shrinks from top to bottom, and guide cut surfaces 130 are provided on both sides. The guide cut surfaces 130 shrink from the middle to the sides, and as shown in FIG. Figure 4-6As shown, the tip of the guide section 130 is located in the same plane as the tip of the upper first gap channel 110, the tip of the lower first gap channel, the tip of the upper second gap channel 120, and the tip of the lower second gap channel. Through this arrangement, in the step of guiding the round head screw whose screw portion is close to three times the diameter of the nut, when the screw portion moves downward to the screw pre-storage area 13, its nut may be located in the area between the lower first gap channel and the upper second gap channel 120. Through the arrangement of the guide section 130, the longer round head screw can be guided along the guide section 130 and enter the outlet when falling toward the outlet, and the guide section 130 provides a larger space in the horizontal direction to prevent the round head screw from accidentally falling due to the gap between the left and right guide members being stretched.

[0039] Preferably, a guide hole 14 is provided between the lower portion of the screw pre-storage area 13 and the outlet. The guide hole 14 is cylindrical, or conical, or arc-shaped, contracting from top to bottom. By providing the guide hole 14, it can better match the edge of the round-head screw, so that the nut of the round-head screw can be hung in the guide hole 14. After the left guide 11 and the right guide 12 are opened to each other, the nut and the guide hole 14 can be separated from each other.

[0040] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. A person skilled in the art will be able to make other variations or modifications based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. An automatic screwdriver guide, comprising left and right guide members that can be opened and closed relative to each other, the left and right guide members enclosing a guide channel, the guide channel having a plurality of guide protrusions, and a guide space formed between two adjacent guide protrusions. A screwdriver reciprocates vertically along the guide channel, the screwdriver head moves downward to close the screw supply channel outlet above the guide protrusion, and the screwdriver head moves upward to connect the screw supply channel with the guide channel, characterized in that: The guide protrusions are all inclined surfaces or arc surfaces with downward inclination on the upper surface. The guide protrusions are composed of upper and lower first guide protrusions and upper and lower second guide protrusions from top to bottom. The first guide protrusions of the same level are enclosed to form an olive-shaped first gap channel, and the second guide protrusions of the same level are enclosed to form a second gap channel with a circular middle part and acute-angled notches at both ends. The tips of each first gap channel and each second gap channel are located in the same plane, and the vertical projections of the second gap channels are concentrically located in the first gap channel. A screw pre-storage area is formed between the lower second guide protrusion and the guide channel outlet.

2. The automatic screwdriver guide according to claim 1, wherein: The relative guiding surface of the guiding protrusion is at least partially curved.

3. The automatic screwdriver guide according to claim 2, wherein: The relative guiding surfaces of the upper and lower first guiding protrusions are arc surfaces that shrink from the middle to the tips on both sides.

4. The automatic screwdriver guide according to claim 3, wherein: The relative guiding surfaces of the upper and lower second guiding protrusions are in the form of notched arc surfaces extending from the middle to the edges of the acute-angled notches on both sides.

5. The automatic screwdriver guide according to claim 1, wherein: At least a portion of the screw pre-storage area is an inclined surface or an arc surface that gradually shrinks from top to bottom.

6. The automatic screwdriver guide according to claim 5, characterized in that: A guide hole is provided between the lower portion of the screw pre-storage area and the outlet. The guide hole is cylindrical, conical, or arc-shaped.

7. The automatic screwdriver guide according to claim 5, wherein: The screw pre-storage area is provided with a guide section, which shrinks from the middle to both sides, and the tip of the guide section is located in the same plane as the tip of each first gap channel and the tip of each second gap channel.

8. The automatic screwdriver guide according to any one of claims 1 to 7, characterized in that: The left and right guide members are axially connected to the base, and the left and right guide members are opened and closed along the rotating shaft to separate the guide channels.

9. The automatic screwdriver guide according to claim 8, wherein: The screw supply channel is arranged on the base, and the screw supply channel outlet leads to the inner channel of the base, and the screwdriver moves vertically back and forth along the inner channel of the base toward the guide channel.

10. The automatic screwdriver guide according to claim 9, wherein: A magnetic component is arranged in the base, and the magnetic component is arranged adjacent to the screwdriver head.

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