JP7246112B1 - Screwdriver and screwdriver set using the same - Google Patents

Abstract

An object of the present invention is to provide a screwdriver in which there is no risk of a screw falling from the screwdriver when moving the screwdriver to a predetermined position. A handle portion (2), a movable locking body (7) having a first locking portion (10) formed at its tip, a rod (4) for pressing the movable locking body, an urging portion (15) for biasing the rod, It has a cylindrical shaft portion 3 . A shaft portion 3 having a second locking portion 8 formed at its tip that engages with a part of the screw hole portion, and a joint connecting the movable locking body and the rod. , and a joint that allows the movable locking body to move in the normal direction from the shaft to the first locking portion and in the opposite direction, and the first locking portion is formed on the inner surface of the shaft portion toward the tip. , and a movable engaging member inclined surface 11 that rubs against the shaft leading end inclined surface is formed on the surface of the movable engaging member on the opposite side of the first engaging portion. [Selection drawing] Fig. 3

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driver for rotating a screw and a screw/driver set using the same.

2. Description of the Related Art Screws, bolts, and the like (hereinafter also referred to as “screws”) are attached or removed in various situations. 2. Description of the Related Art In the manufacturing process of articles and devices in factories, etc., screws are sometimes attached and removed. Alternatively, screw mounting operations are performed for the installation of equipment and facilities. Alternatively, screws are removed for replacement or repair of equipment or facilities. A screwdriver is usually used as a tool in these operations.

When attaching or removing a screw using a screwdriver, work is performed by setting the screw at the tip of the screwdriver. This is the same for both a manually operated screwdriver and an electric screwdriver that rotates electrically.

The screw has grooves, holes, etc. that can be rotated by a screwdriver. The tip of a screwdriver is applied to the groove/hole or the like to attach or remove the screw. At this time, the tip of the screwdriver and the grooves/holes of the screw are only applied to each other, so they are not properly connected to each other. The operator maintains contact between the tip of the driver and the groove/hole of the screw by holding and supporting each of the screw and driver by hand. For this reason, if gripping is difficult or the gripping force is insufficient, the screw may drop from the tip of the driver, and various measures have been taken to prevent this.

In the invention described in Patent Document 1 (see FIG. 13), a cylindrical chuck 102 is arranged around a cross bit 103 attached to the tip of a hexagonal shaft 104 of a driver, and a cylindrical holder 101 is provided outside thereof. ing. The distal end of cylindrical chuck 102 is bent inward and claws 102
a is formed. When the screw is attached to the end of the cross bit 103, the screw is caught by the pawl 102a, so that even if the screw is directed downward, the screw does not easily fall off.
However, since the screw is only caught, there is a risk of the screw falling when a downward force (eg, acceleration during movement) is applied.

In the invention described in Patent Document 2 (see FIG. 14), a grip portion 213 of a driver is provided with a tubular main body 210, a moving portion 202 is arranged in the tubular main body 210, and a tip portion 20 at the tip end is provided.
A screw 205 is locked at the distal end of 3 . Although the screw 205 does not fall in the direction shown in FIG. 14, it is easily expected that the screw 205 will fall if the opening 211 is directed downward.

In the invention described in Patent Document 3 (see FIG. 15), a tip portion 303 is provided at the distal end of a shaft connected to a handle portion 310 of a driver, and a fitting portion 307 is provided in the middle of the shaft. . The fitting portion 307 is provided with an annular support portion 313 and an annular portion 311 , and a magnetic portion 309 is attached to the distal end of the annular portion 311 . When the fitting portion 307 is moved to the flange portion 317, the tip portion 303 becomes magnetized. It will be locked and less likely to fall. However, if the driver is subjected to acceleration or impact during movement, the screw can easily be expected to fall. Also, non-magnetic stainless steel screws do not function to prevent falling.

The invention described in Patent Document 4 (see FIG. 16) shows a driver 401 having a grip portion 403 and a main body portion 402, and a tip portion 404 at the distal end of the main body portion 402 has a concave portion 442 and a convex portion 442.
41 is formed. A flexible member 405 having an adsorptive property is attached to the concave portion 442 . This flexible member 405 enters into the locking hole/groove of the screw to prevent the screw from falling.
and the grooves and holes of the screw, it is easy to predict that the screw will fall if acceleration or impact is applied to the driver during movement.

In the invention described in Patent Document 5 (see FIG. 17), the first blade portion 5 is provided at the distal end of the driver 632.
21, a second blade portion 522, a third blade portion 523, a fourth blade portion 524, a cavity 713, a cavity 723, a protrusion 711, and a protrusion 721 are formed. When the tip of the screwdriver is pushed into the groove/hole of the screw, the cavity 713 and the cavity 723 become smaller, the protrusions 711 and 721 press against the groove/hole of the screw, and the first blade portion 521 and the second blade portion 522 expand. This will make it harder for the screw to come off the screwdriver. However, the force with which the tip of the screwdriver is pushed into the groove/hole of the screw varies, and if the force is too weak, the screw may come off the screwdriver.

The screw 805 and driver shown in FIG. 18 are used for spinal surgery. A slit 803 is formed in the shaft portion 801 of the driver, and a slit 804 is formed in the tip portion 802 thereof. The screw 805 has a hole (torx (registered trademark)) 806 for locking, and the tip portion 802 is made slightly larger than the hole 806 . When the tip of the driver is pushed into the hole 806, the slits 803 and 804 are formed, so the tip of the driver is pushed into the hole 80.
The screw 805 is hard to come off from the driver due to the force that the screw 805 enters 6 and tries to spread the tip. However, since the screw is locked only by the force that causes the tip to expand, it is easy to predict that the screw will fall if acceleration or impact is applied to the driver during movement. again,
If a large torque is applied to tighten the screw using this driver, the tip of the driver may be damaged.
Instead of the slit in FIG. 18, the tip 802 is tapered and the screw
5 and apply an impact to the distal end portion 802 to lock it, but this method is unreliable due to variations in the applied impact force.

A driver 900 in FIG. 19 includes a handle portion 901, a shaft portion 902, a tip portion 903,
It is composed of a rod 905, a knob 907 and the like, and a slit 904 is formed in the rod tip portion 906 in the same manner as the driver in FIG. The driver 900 of FIG. 19 is further provided with a knob 907. When this is turned, the male thread 908 and the female thread 909 engage with each other to move the rod tip 903 to the left and push the tip 903 apart. By this expansion,
The screw can be firmly locked. However, like the driver in FIG.
If a large torque is applied to tighten the screw using this driver, the tip of the driver may be damaged.

Utility Model Registration No. 3131577 JP 2010-137332 A JP 2010-42486 A JP 2020-62713 A Japanese Patent Application Laid-Open No. 2020-66091

In the conventional screwdriver shown in FIGS. 13 to 19, there is a possibility that the screw locked at the tip of the screwdriver may be disengaged and dropped due to an impact or the like, and there is no guarantee that the screw will not drop until the screwdriver starts screwing. For example, many screws may be used in the placement of implants in the field of orthopedics and spinal surgery, where if a screw falls into the patient's surgical field, it may fall into the patient's body during surgery, causing medical problems. It may lead to an accident. Also, in various industrial fields, concerns about the screw dropping from the driver cause a decrease in work efficiency and various troubles.

SUMMARY OF THE INVENTION The present invention has been made in view of this point, and its object is to provide a screwdriver in which the screw does not drop from the screwdriver when the screwlocking screwdriver is moved to a predetermined position. It is in.

The screwdriver according to the present invention, which has been made to solve the above problems, has a function in which the screw locked to the tip of the driver does not move away from the tip of the driver while the screwdriver is moving. It has an epoch-making function compared to the fact that there was nothing certain about this point.

The present invention (1) is a driver that rotates a screw having a screw hole portion that engages with a driver, comprising: a handle portion that rotates the driver; and a first engaging portion that engages with a portion of the screw hole portion. a movable locking body having a portion formed at its tip; a rod that presses the movable locking body in a distal direction toward the tip side; an urging portion that urges the rod in the distal direction; A cylindrical shaft part that accommodates the movable locking body, the second locking part that engages with a part of the screw hole is formed at the distal end, and the other end is connected to the handle. A joint that connects a fixed shaft portion, a proximal end portion of the movable locking body closer to the handle and a distal end portion of the rod, wherein , the first
a joint that allows the movable locking body to move in the normal direction toward the locking portion and in the opposite direction; A shaft tip inclined surface that is an inclined surface approaching the first locking portion is formed, and a movable locking body inclined surface that rubs against the shaft tip inclined surface is formed on the surface of the movable locking body on the opposite side of the first locking portion. It is a formed driver.

A screw having an external thread such as a screw, bolt, or screw is screwed into an object with a screwdriver to perform its function. The screw has a screw hole in its head for engagement with the driver, and this screw hole has various forms such as slotted grooves, Phillips grooves, hexagonal holes, Torx (registered trademark) holes, and the like.

Since the driver of the present invention (1) has the structure described above, when the rod is urged toward the distal end by the urging member, the structure of the joint, the inclined surface of the tip of the shaft and the inclined surface of the movable locking body The structure can prevent the screw from being separated from the tip of the driver due to the first locking portion being pressed against the screw hole. Since the force with which the first locking portion is pressed against the screw hole corresponds to the biasing force of the biasing portion, the screw can be reliably prevented from separating from the tip of the screwdriver by adjusting the force.

In the present invention (2), the joint is provided with a connecting pin for connection to one of the movable locking body and the rod, and a hole through which the connecting pin is inserted in the other, wherein the normal line The driver of the present invention (1) has a structure in which an oblong hole with an oblong shape is formed in the direction.

In the present invention (2), since the structure of the joint is composed of the connecting pin and the oval hole, the structure is simple, and along with the movement of the rod in the axial direction, the direction toward the first locking portion from the shaft is achieved. The movable locking body may be movable in the linear direction and vice versa.

Present invention (3) is the driver according to present invention (1) or (2), wherein the biasing portion is a compression coil spring interposed between the proximal end of the rod and the handle.

In the present invention (3), the urging portion is a compression coil spring, and the structure is simple, so that cost reduction can be achieved. Besides the compression coil spring, it is of course possible to use a pneumatic system, a hydraulic system, an electric motor system, or the like.

The present invention (4) has a release pin connected to the proximal end portion of the rod and biased toward the distal end side by the biasing portion, wherein the release pin extends in a direction perpendicular to the axis. The driver according to the present invention (1) or (2), which is arranged in the release pin hole formed in the shaft portion.

In the present invention (4), since the release pin having the structure described above is provided, when the release pin is moved proximally with a finger, the first locking portion of the driver and the screw hole can be easily locked. can be released.

The present invention (5) is a screw/driver set comprising a screw, a base plate for detachably fixing the screw, and the driver of the present invention (1) or (2).

The present invention (6) is a screw/driver set comprising a screw, a base plate for detachably fixing the screw, and the driver of the present invention (3).

The present invention (7) is a screw/driver set comprising a screw, a base plate for detachably fixing the screw, and the driver of the present invention (4).

In the present inventions (5) to (7), since the screw is detachably fixed to the base plate, the tip of the screwdriver can be easily locked to the screw hole of the screw using a screwdriver. Pulling the set screw out of the base plate ensures that the screw will not fall out of the driver even when the driver is moved to the desired location.

According to the present invention, when moving the driver that locks the screw to a predetermined position,
It is possible to provide a driver that does not cause the screw to drop from the driver.

1 is a perspective view of a driver according to Embodiment 1 of the present invention; FIG. 1 is a partial perspective view showing the entire driver according to Embodiment 1 of the present invention; FIG. 1 is a schematic diagram showing the overall configuration of Embodiment 1 of the present invention, and a schematic diagram showing movement of an internal structure. FIG. 1 is a perspective view of the tip side of a driver according to Embodiment 1 of the present invention; FIG. 1 shows a movable lock according to Embodiment 1 of the present invention; Fig. 2 is a longitudinally cut perspective view of the distal end side of the shaft of Embodiment 1 of the present invention; FIG. 4B is a view showing the movement of the tip of the driver according to Embodiment 1 of the present invention, showing the state when the release pin is moved proximally. FIG. 4B is a diagram showing the movement of the tip of the driver according to the first embodiment of the present invention, showing the state when the release pin is freed. Fig. 2 is an enlarged perspective view of the tip portion of the driver according to the first embodiment of the present invention; FIG. 4 is a partially perspective view showing the vicinity of the release pin and compression coil spring of the driver according to Embodiment 1 of the present invention; FIG. 4 is a perspective view of the vicinity of the release pin of the driver according to Embodiment 1 of the present invention when viewed from above; It is a schematic diagram showing the screw driver set of the present invention. FIG. 3 is a partial cross-sectional view showing the tip of the driver described in Patent Document 1; 1 shows a driver described in Patent Literature 2; FIG. 3 is a partial cross-sectional view showing the driver described in Patent Document 3; 1 shows a driver described in Patent Literature 4; FIG. 4 is a partial cross-sectional view showing the tip of the driver described in Patent Document 5; 1 shows a perspective view of a tip portion of a driver and a screw used in prior art spinal surgery; FIG. 18 shows a modified version of the driver of FIG. 18, used in prior art spinal surgery.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail based on the drawings. In addition, the following embodiments are
It is essentially a preferred illustration and is not intended to limit the scope of the invention, its applications, or its uses.

<Embodiment 1>
1 to 11 show Embodiment 1 of the driver of the present invention.
A driver 1 shown in FIG. 1 has a handle portion 2 and a shaft portion 3. At the tip end thereof, there is a movable locking body locking portion 10 as a first locking portion and a shaft tip locking portion as a second locking portion. A release pin hole 18 is drilled in the shaft portion 3 and a release pin 16 is arranged in the release pin hole 18 .

FIG. 2 is a partially perspective view showing the entire driver according to Embodiment 1 of the present invention. A driver 1 has a handle portion 2 and a shaft portion 3, and a shaft tip end engaging portion 8 (second engaging portion) and a movable engaging body engaging portion 10 (first engaging portion) are formed at the tip. ing. The compression coil spring 15 is arranged between the release pin 16 and the spring receiving portion 14 . The release pin 16 is fitted in the release pin hole 18 . The spring receiving portion 14 is attached to the handle portion 2 by a spring receiving portion rod 19.
is fixed to

FIG. 3 is a schematic diagram showing the overall configuration of Embodiment 1 of the present invention, and a schematic diagram showing movement of the internal structure. A cylindrical shaft portion 3 is fixed to a handle portion 2 of a driver 1, and a shaft tip locking portion 8 is formed at the tip. A shaft tip slope 9 is formed on the inner surface of the tip. Inside the shaft portion 3, from the tip side, a movable locking body 7, a rod 4, a release pin 16,
A compression coil spring 15 is provided. Spring receiver rod 19 extending from spring receiver 14
is fixed to the handle portion 2 , and the spring receiving portion 14 is fixed to the handle portion 2 .

A movable locking body locking portion 10 (first locking portion) is formed at the tip of the movable locking body 7, and a movable locking body tip slope 11 is formed on the lower surface. The inclined surface 11 at the tip of the movable locking member rubs against the inclined surface 9 at the tip of the shaft. The movable locking body locking portion 10 and the rod large diameter portion 6 of the rod 4 are connected by a joint. The joint has a structure in which a connecting pin 12 connected to the large-diameter portion 6 of the rod is inserted into an oblong hole 13 formed in the proximal portion of the movable locking body 7 . The rod main body 5 and release pin 16 are fixed by a stop pin 17 .

FIG. 3A shows a state in which the user holds the release pin 16 and arranges it in the intermediate portion of the release pin hole 18 . The distal end of the movable locking body 7 is aligned with the distal end position of the shaft distal end locking portion 8 . When the finger is released from the release pin hole 18 , the rod 4 presses the movable locking body 7 leftward due to the biasing force of the compression coil spring 15 .
1 are in contact with each other, it is necessary to lift the movable locking member 7 upward, and the connecting pin 12 and the oval hole 1
3, since the oblong hole 13 can be raised upward from the state of FIG. 3(A), the state of FIG. 3(B) can be obtained. The tip of the movable locking body 7 protrudes in the distal direction by _L1 .

When the screwdriver 1 is engaged with the screw hole portion 31 of the screw 30 having the male thread 32, the tip of the movable locking body 7 is pushed back, and the projection length of the tip becomes _L2 , and the state shown in FIG. 3(C). become. In this state, the biasing force of the compression coil spring 15 causes the movable locking member locking portion 10 to move.
A force is applied in an upward direction to the upper surface of the screw, the force is applied to the screw hole part 31, the screw 30 and the driver 1 are firmly engaged, and the screw 30 does not come off from the driver 1. - 特許庁

3(a) shows the joint portion of FIG. 3(A), FIG. 3(b) shows the joint portion of FIG. 3(B), and FIG. 3(c) shows the joint portion of FIG. 3(C). showing. When the state of FIG. 3(a) shifts to the state of FIG. 3(b), the position of the oval hole 13 shifts upward by _D1 , and the
When shifting to the state of (c), the position of the oblong hole 13 is lowered, and _D1 becomes _D2 .

FIG. 4 is a perspective view of the driver tip side of Embodiment 1 of the present invention. A rod body portion 5 and a rod large diameter portion 6 are housed inside the shaft portion 3 and are connected to a movable locking body 7 . A Torx (registered trademark)-shaped movable locking body locking portion 10 is formed at the tip of the movable locking body 7, and a shaft tip locking portion 8 is formed at the tip of the shaft portion 3. 7 and the tip portion of the shaft portion 3 are in contact with each other at the movable locking body tip slope 11 and the shaft tip slope 9 .

FIG. 5 shows the movable locking body of Embodiment 1 of the present invention. The movable locking body 7 has a movable locking body locking portion 10 formed at its tip, a movable locking body distal end slope 11 formed on its lower surface, and an oblong hole 13 formed in its proximal end. The circular hole 13 is part of the joint structure.

FIG. 6 is a vertical cut perspective view of the distal end side of the shaft of Embodiment 1 of the present invention. A shaft tip engaging portion 8 is formed at the tip of the shaft portion 3, and a shaft tip slope 9 is formed on the inner surface.

FIG. 7 is a diagram showing movement of the tip of the driver according to Embodiment 1 of the present invention, showing a state when the release pin is moved proximally. Inside the shaft portion 3 , the rod large-diameter portion 6 and the movable locking body 7 are connected by a joint composed of a connecting pin 12 and an oblong hole 13 . The tip of the movable locking body locking portion 10 is shifted to the right by a greater amount than the tip of the shaft tip locking portion 8 . This corresponds to the state in which the release pin 16 in FIG. 3 is moved to the rightmost side. Due to the large diameter portion 6 of the rod, the movement of the rod 44 is horizontal.

FIG. 8 is a diagram showing the movement of the tip of the driver according to Embodiment 1 of the present invention, showing the state when the release pin is free. As compared with FIG. 7, when the release pin 16 is released and released, the urging force of the compression coil spring 15 causes the tip of the movable locking member 7 to move leftward.

FIG. 9 is an enlarged perspective view of the tip portion of the driver according to Embodiment 1 of the present invention. A shaft tip locking portion 8 is formed at the tip of the shaft portion 3, and a movable locking body locking portion 10 formed at the tip of the movable locking body 7 is shown.

10 is a partially transparent view showing the vicinity of the release pin and compression coil spring of the driver according to Embodiment 1 of the present invention. FIG. A shaft portion 3 is fixed to the handle portion 2 , and a rod body portion 5 , a compression coil spring 15 and a spring receiving portion 14 are housed inside the shaft portion 3 . The shaft portion 3 and the release pin 16 are connected and fixed, and the left end of the compression coil spring 15 is connected to the release pin 1 .
6 is biased leftward, and the spring receiving portion 14 is biased rightward. A release pin hole 18 is vertically formed in the shaft portion 3, and a release pin 16 is accommodated therein.

FIG. 11 is a perspective view of the vicinity of the release pin of the driver according to Embodiment 1 of the present invention when viewed from above. The shaft portion 3 is fixed to the handle portion 2, and a release pin hole 18 is formed. A release pin 16 is accommodated in the release pin hole 18, and the compression coil spring 15
is seen.

FIG. 12 is a schematic diagram showing the screw and driver set of the present invention. driver 3
1, a screw 32 attached to the tip of a driver 31 for use, and a base plate 33 to which the screw 32 is detachably attached. The screw 32 and the base plate 33 may be locked by screwing. Preparing such a set is useful when a large number of screws are to be used and the screw 32 must not come off the tip of the driver 31 during use.

INDUSTRIAL APPLICABILITY As described above, the driver of the present invention can be suitably used as a driver that prevents the screw from dropping when the driver for locking the screw is moved to a predetermined position.

1; driver 2; handle portion 3; shaft portion 4; rod 5; rod body portion 6; connecting pin 13; oval hole 14; spring receiving portion 15; compression coil spring 16; release pin 17; driver 32; screw 33; base plate

Claims (7)

A driver that rotates a screw having a screw hole that engages with the driver,
a handle for rotating the driver;
a movable locking body having a first locking portion at its tip that engages with a portion of the screw hole;
a rod that presses the movable locking body in a distal direction toward the distal end;
a biasing portion that biases the rod distally;
A cylindrical shaft part that accommodates the rod and the movable locking body, the second locking part that engages with a part of the screw hole is formed at the distal end, and the other end is a shaft portion connected and fixed to the handle;
A joint that connects a proximal end portion of the movable locking body closer to the handle and a distal end portion of the rod, the joint moving from the shaft to the first rod as the rod moves in the axial direction. a joint that allows the movable locking body to move in the normal direction toward the locking portion and in the opposite direction,
On the inner surface of the shaft portion that is in the normal direction, a shaft tip slope, which is a slope that approaches the first locking portion toward the tip, is formed. A driver in which a movable engaging member sloped surface that is rubbed with the shaft tip sloped surface is formed on the surface of the stopper. The joint has a connecting pin for connecting to either one of the movable locking body and the rod, and a hole through which the connecting pin is inserted in the other, and has an oval shape in the normal direction. 2. The driver according to claim 1, which has a structure in which an oblong hole is formed. 3. A driver according to claim 1 or 2, wherein the biasing member is a compression coil spring interposed between the proximal end of the rod and the handle. a release pin connected to the proximal end of the rod and biased distally by the biasing portion, the release pin being drilled through the shaft in a direction orthogonal to the axis; 3. A driver according to claim 1 or 2, which is arranged in a pin hole. a screw;
a base plate for detachably fixing the screw;
A screw driver set comprising a driver according to claim 1 or 2. a screw;
a base plate for detachably fixing the screw;
A screwdriver set comprising a driver according to claim 3. a screw;
a base plate for detachably fixing the screw;
A screwdriver set comprising a driver according to claim 4.

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