JP2010155321A - Drill bit cooler for hand-drill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide new cooling technology for drill bit without largely increasing weight of the hand-drill, attachable without degrading its portability and operability, freely supplying coolant to the drill bit during drilling work, prolonging the service life of the drill bit, and providing more economical use. <P>SOLUTION: The drill bit cooler 1 for the hand-drill includes an extension shaft 2 in which a shank 21 is formed at a base end and a bit attachment part 22 is formed at an end, and is constructed by combining a liquid pump 3 including a cooling nozzle 34 postured to inject the coolant 8 toward the drill bit 7 attached to the bit attachment part 22 to the periphery of the extension shaft and a pump mechanism 30, with a liquid supply tank 4 storing the predetermined amount of coolant 8 and connected to the liquid pump 3 to freely supply the coolant 8 by providing a joint mechanism 5 integrating the both to be concentrically skewered and attached in a vertical line along the axial direction of the extension shaft 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

    The present invention relates to a technique that can prevent a drill bit from being overheated during use of a hand drill. In addition to the field of manufacturing a drill bit cooler that can be attached to a hand drill, its transportation, Materials necessary for storage, assembly and installation, and equipment and instruments necessary for storage, assembly and installation, materials required for such materials, machinery and parts, such as wood, stone, various fibers, plastics, various metal materials Etc., the electronic components incorporated in them, the field of control-related equipment that integrates them, the field of various measuring instruments, the field of power equipment that moves the equipment and instruments, and the power and energy sources that serve as the energy Fields generally referred to as industrial machinery, such as the fields of electricity and oil, as well as testing and researching those facilities and instruments, and exhibiting them Fields related to sales, imports and exports, generals, results of their use, facilities for making them, fields related to the collection and transportation of waste generated by the operation of equipment, and efficient use of such waste In addition to the recycle fields that are reused, there are no technical fields that are not related to new fields that cannot be envisaged at this time.

(Points of interest)
When using a hand drill to continuously drill holes in metal plates, high-strength concrete walls, tiles, etc., the drill bit must be sufficiently cooled before starting the next drilling operation. Friction heat causes the drill bit to overheat abnormally and wears rapidly, making it unusable and preventing efficient drilling work. To solve these disadvantages, it excels in heat resistance. Various drill bits that can reduce the occurrence of seizure, galling, erosion, heat check and cracking, such as those made of high-speed tool steel and cemented carbide, and those with a heat-resistant coating such as titanium coating, are widespread is doing.

    However, even when such a high-performance drill bit is used, it may be overheated during continuous use for a long time, and may be worn and damaged earlier than the original life. If such a situation occurs frequently, it takes a lot of work to replace the drill bit, which not only greatly reduces the efficiency of the original drilling work, but also provides for the polishing and maintenance of worn drill bits and new drills. There is a drawback that the cost for purchasing the bit is increased and the economical disadvantage increases.

(Conventional technology)
Considering such a situation, for example, as represented by the following proposed in Patent Document 1 (1), a supply pipe for supplying cooling water is formed from the shank portion of the drill bit to the blade tip, A machine tool body such as a machining center that receives water from a water supply mechanism provided on a crocodile to reduce and cool the frictional resistance between the work material and the cutting edge of the drill bit. A side wall corresponding to the vicinity of the drill bit of the sealing cover is provided, as shown in (2), provided with a sealing cover that can surround the periphery of the drilled portion of the work material and the periphery of the drilling chuck mounting portion on which the drill bit is mounted. A suction pipe is connected to the other side wall, which is opposite to the suction pipe, and an ejection hole that enables supply of cooling water from the external mist generating mechanism is drilled. Supplying mist around, and such as those made as a possible suction outlet is scattered.

However, the one in which the cooling water supply pipe is formed inside the drill bit as in the idea shown in the former Patent Document 1 (1) is complicated and the structure of the drill bit itself is complicated and expensive. However, it is inferior in strength to general-purpose drill bits, so it is suitable for high-precision cutting such as a machining center, but it is not suitable for hand drills where the main body can move easily during drilling work to hold the main body by hand. In addition to causing the disadvantage of being easily damaged, it is necessary to incorporate a water absorption mechanism inside the hand drill, and the hand drill itself has a disadvantage that it becomes complicated and expensive and economically disadvantageous, Moreover, in the kind of the device in which the hermetic cover of Patent Document 1 (2) is mounted near the chuck of the drilling machine, a mist generating mechanism and a suction mechanism which are separate from the drilling machine. Although it is suitable for stationary machine tools, it is very difficult to incorporate it into a hand drill where portability is important, and even if it can be incorporated, it is difficult to avoid an increase in size and weight. There was a risk that the drilling workability would be greatly deteriorated.
(1) Utility Model Registration No. 3134011 (2) Utility Model Publication No. 6-17847

(Awareness of problems)
As mentioned above, the drill bits with built-in coolant supply pipes that have been proposed in the past and drilling machines with built-in coolant supply and suction mechanisms all have portability and are rough daily. It is extremely difficult to combine with hand drills that are handled, and it is inevitable to increase the weight, increase the size, make the structure complicated, decrease the durability, and increase the price. It is impossible, and there is still no technology that can efficiently supply the coolant to the drill bit during drilling without impairing the portability and durability of the hand drill.

(Object of invention)
Therefore, the present invention does not significantly increase the weight of the hand drill, can be mounted without impairing its portability and operability, and can freely supply coolant to the drill bit during drilling. Therefore, we decided to develop a new drill bit cooling technology that would extend the life of the drill bit and make it more economically usable. As a result of repeating many trial manufactures and experiments, this time, we finally succeeded in realizing a drill bit cooler for hand drills with a new structure. The configuration will be described in detail with an example.

(Structure of the invention)
As clearly understood from the embodiments representing the present invention shown in the drawings, the drill bit cooler for hand drills of the present invention basically comprises the following configuration.
That is, an extension bar type extension shaft in which a shank for mounting a hand drill is formed at the base end of a linear bar set to a predetermined length and a bit mounting portion is formed at the tip opposite to the shank. A cooling nozzle having a posture capable of injecting a coolant toward the drill bit when mounted on the bit mounting portion around the extension shaft between immediately after the bit mounting portion and the shank; A liquid pump having a pump mechanism capable of pumping coolant toward the cooling nozzle in response to the operation, and a predetermined amount of coolant can be stored, and an appropriate amount of coolant can be supplied to the liquid pump. The liquid tanks that can be connected are mounted in tandem and concentric skewers along the axial direction with respect to the extension shaft, and both can be integrated between the liquid pump and the liquid tank. Provided with a connecting mechanism As the centrifugal force generated extension axis in rotated are balanced, a drill bit cooler hand drill summarized as structure was made by combining.

    When the drill bit cooler for a hand drill having this basic configuration is shown as a more specific one, a shank for mounting a hand drill is formed at the base end of a linear rod set to a predetermined length, It has an extension bar type hexagonal extension shaft with a bit mounting part formed at the tip opposite to the shank, and a torus-shaped container around the hexagonal extension axis immediately after the bit mounting part. It has a cooling nozzle that can spray coolant toward the drill bit when the tip is attached to the bit attachment part, and the cooling pipe is subjected to a predetermined operation. A liquid pump equipped with a pump mechanism capable of pumping coolant toward the nozzle is arranged, and the hexagonal extension shaft is located in the middle of the hexagonal extension shaft immediately after the liquid pump and concentrically around the hexagonal extension shaft. Can be mounted A liquid supply tank that can store a predetermined amount of coolant and that can be connected to an appropriate amount of coolant via a check valve is disposed in the liquid suction pipe of the liquid pump, and is connected to the extension shaft. In addition, a coupling mechanism is provided between the liquid pump and the liquid supply tank so that they can be integrated with each other around the extended shaft during rotational driving. A drill bit cooler for a hand drill having a combined structure so that the generated centrifugal force is balanced.

    More specifically, an extension bar in which a shank for mounting a hand drill is formed at the base end of a linear bar set to a predetermined length, and a bit mounting portion is formed at the tip opposite to the shank. A hexagonal extension shaft, and around the hexagonal extension shaft immediately after the bit mounting portion, the coolant can be stored inside, and the tip of the drill bit when attached to the bit mounting portion Provided with a cooling nozzle capable of injecting a cooling liquid toward the rear end, having a liquid absorption pipe for the cooling liquid at the rear end, the outer diameter being compressible and deformable with a pressing force directed toward the hexagonal extension shaft, and An elastic container having an O-shaped floating ring structure that can automatically return to its original shape is provided with a manual liquid pump that forms a pump mechanism, and immediately after the liquid pump and between the shank and the shank. The intermediate position of the hexagonal extension shaft A liquid supply tank that can store liquid and is connected to the liquid suction pipe of the liquid pump via a check valve so that an appropriate amount of cooling liquid can be supplied freely. In addition, a coupling mechanism is provided between the liquid pump and the liquid supply tank so that they can be integrated with each other, and the centrifugal force generated around the extension shaft during rotational driving is provided. It becomes a drill bit cooler for hand drills having a configuration that is combined so as to be balanced.

    As described above, according to the drill bit cooler for a hand drill of the present invention, unlike the conventional one, from the characteristic characteristic configuration as described above, without significantly increasing the weight of the hand drill, and The drill can be installed without changing the structure of the hand drill body and drill bit without any loss of portability and operability. Cooling fluid can be supplied easily and quickly to the drill bit during drilling work. As a result, it is possible to improve the durability life in each stage, improve the efficiency of boring work, and realize the economical use in each stage.

    In addition, a liquid pump made of a torus-like container is provided immediately after the bit mounting portion around the extension bar type hexagonal extension shaft, and a liquid supply tank is arranged immediately after the liquid pump, and between the liquid pump and the liquid supply tank. In addition, it is easy to install an extension bar on a hand drill, which is provided with a coupling mechanism that enables both to be integrated and combined so that the centrifugal force generated around the extension shaft during rotation is balanced. The drill bit can be easily and securely attached to the tip bit mounting part, and the shaft of the extension shaft during rotation can be stably controlled to prevent unnecessary vibrations. There is an advantage that the burden can be reduced and a lighter boring operation can be realized.

    In addition, an electric motor comprising an elastic container having an O-shaped floating ring structure in which the liquid pump can be compressed and deformed by a pressing force directed from the outer diameter toward the hexagonal extension shaft and can be automatically restored to its original shape is an electric motor. No need for any other actuators, etc., and the coolant can be injected toward the drill bit by compression with fingers, which can achieve a simplified structure and lighter weight, and also make maintenance easier with fewer failures It is excellent, and it is possible to provide it at a lower cost, and it exhibits the characteristics that enables economical use.

    And, if the liquid pump has a suction pipe for cooling liquid at the rear end and a liquid supply tank is connected to the suction pipe with a check valve interposed between them, no cooling liquid is required. Therefore, it is possible to prevent the reverse flow more reliably, and to achieve an excellent effect that it is possible to realize more efficient injection of the coolant.

    Furthermore, a mounting cylinder that is concentric with the extension shaft and cannot be rotated between the tip wall and the central cylinder wall of the liquid pump and the extension shaft, and can be mounted so as to contact the base end of the bit mounting portion. And a hard material holder made up of a flange integrated with the tip of the mounting cylinder and set to a diameter corresponding to the outer diameter of the liquid pump. Combined with a coupling mechanism that can be screwed into the nut, which is either integral or separate from the tank tip, the connection between these liquid pumps and the liquid tank is more durable. The strength can be increased, and when performing maintenance, the nut is removed from the male screw of the holder, and the liquid pump and the liquid tank can be easily disassembled and reassembled. Shaped float In the case of a manual type pump made of an elastic container with a structure, especially the tip wall and the central cylinder wall are reinforced to increase the compression efficiency of the pump, and the extension shaft is driven to rotate and the compression operation with fingers is repeated. The effect that the durability at the time of receiving can be increased and the pump life can be greatly improved is obtained.

In implementing the present invention having the above-described configuration, the best or desirable mode will be described.
The extension shaft is detachable between the drill bit mounting part (chuck) of the hand drill and the mounting drill bit so that the liquid pump and the supply tank can be detachable in columns and concentric skewers along the axis of rotation. It has a function that enables it to be mounted, has high strength and durability, and forms a shank for hand drill mounting at the base end of a linear bar set to a predetermined length, opposite to the shank It must be an extension bar type with a bit mounting part at the tip of the glue, and the base shank for hand drill mounting can be cylindrical, but it is a rectangular parallelepiped that allows more reliable connection It is desirable to use a hexagonal column-shaped shank as shown in the shape and examples described later.

    The bit mounting part allows the shank of the drill bit to be detachably and securely mounted on the tip of the extension shaft, and the drill bit must be detachable simply and reliably, similar to the hand drill chuck In addition, a socket that can be opened and closed and allows the shank of the drill bit to be connected in a tightening shape, a socket that can be fitted and fitted with a rectangular parallelepiped shank, or a hexagonal shank as shown in the embodiments described later. A bottomed cylindrical shape that can be fitted and mounted can be used.

    The liquid pump performs the function of pumping and spraying an appropriate amount of the coolant supplied from the feed tank toward the drill bit when it is mounted on the bit mounting part of the extension shaft. The dimensions and shape of the center of gravity (including the internal coolant) must be balanced, and it should be possible to quickly and efficiently inject an amount of coolant that can sufficiently cool the drill bit heated by the boring operation. In addition, it can be provided with a pump mechanism such as an electric pump that is driven by the supply of electric power or a centrifugal pump that is driven by using the rotational force of the extension shaft. As described above, it is made of a torus-shaped container that is mounted around the extension shaft, and can be compressed and deformed by a pressing force directed toward the extension shaft from the outside diameter, and can be automatically returned to its original shape. Elasticity of ring structure When the hand drill and extension shaft are in a stopped state, the internal pressure is increased by the compression force by manual operation so that an appropriate amount of coolant can be injected, and the pump itself forms a pump mechanism. be able to.

    The liquid pump is provided with a cooling nozzle capable of injecting a coolant toward the drill bit when the tip is attached to the bit attachment portion, and a rear end has a liquid suction pipe for the coolant. It is desirable that the liquid suction pipe is connected to the liquid supply tank via a check valve, and as shown in an embodiment described later, the tip wall and the central cylinder wall are extended. A mounting cylinder that is concentrically and non-rotatably mounted on the extension shaft, and a flange that is integrated with the tip of the mounting cylinder and has a diameter corresponding to the outer diameter of the liquid pump. While a hard material holder is interposed and a male screw is engraved on the outer peripheral wall of the mounting tube base end that is opposite to the flange of the holder, it is either integral with the tip of the liquid supply tank or either A connecting mechanism consisting of a bolt / nut structure is formed. It can be composed Te.

    The connection mechanism has a function that allows the liquid pump and the liquid supply tank to be detachably connected with sufficient strength, and at least the liquid pump to be concentrically and non-rotatable around the extension shaft and detachably mountable. When it is a liquid pump that is set to a shape and size that can hold the liquid pump with sufficient strength, and that is operated by manual external pressure as shown in the examples described later. In particular, a holder comprising a mounting cylinder and a flange supports the tip wall and the central cylinder wall of the liquid pump, and the appropriate place of the holder and the appropriate position of the liquid supply tank are detachably connected to each other to connect the flange and the liquid supply. It is desirable that the liquid pump can be reliably held between the front end wall of the tank and can be protected so as to reinforce peripheral walls other than the outermost peripheral wall of the liquid pump.

    The cooling nozzle fulfills the function of being able to be guided so as to be able to accurately inject the coolant pumped from the liquid pump toward the drill bit when mounted on the bit mounting portion of the extension shaft. It must be able to maintain its own shape with sufficient strength. For example, a soft material nozzle that can be elastically deformed and automatically restored is provided, and the tip of the nozzle is directed from the outer diameter direction of the extension shaft toward the coaxial center. In addition, a guide rail that can be guided and held is provided, an outer diameter is arranged on the side of the nozzle tip, and an adjustment screw is provided so that the guide rail can be advanced and retracted toward the centripetal direction of the extension shaft axis. A universal joint machine that can adjust the direction of the nozzle tip by adjusting the adjustment screw forward or backward, or a flexible joint machine that can adjust the tip direction of the nozzle freely and temporarily fix it in the middle of the nozzle made of hard material. Or a rotating shaft capable of changing the direction of the nozzle tip, and a gear is mounted on the rotating shaft, and a temporary fixing leaf spring fixed to the liquid pump side with respect to the gear. It is assumed that the elastic engagement parts are meshed, the gear is rotated in a dial shape to change and adjust the direction of the nozzle tip, and can be temporarily fixed by the meshing of the elastic engagement parts, etc. It is possible to adjust the jet angle of various cooling liquids, to make it possible to temporarily fix the angle, and to incorporate a posture adjusting mechanism, as shown in the examples described later, the flange portion of the coupling mechanism has a penetrating shape. A guide hole is drilled, and the cooling nozzle can be attached to the guide hole so that the nozzle posture can be temporarily fixed. Further, although not shown in the embodiments described later, the circumferential direction of the flange of the coupling mechanism Temporarily fixed to various nozzle postures along If you have drilled multiple guide holes with different posture angles and replaced them with drill bits with different lengths and thicknesses, select the guide holes with the appropriate posture according to your needs. The cooling nozzles can be combined so as to be mounted.

    In addition, the cooling nozzle is made of a hard pipe that incorporates a telescopic telescopic mechanism and its length can be freely adjusted, or a soft pipe that incorporates a winding hose-like winding mechanism. The length of the opening can be adjusted, and an opening / closing lid mechanism comprising an opening / closing lid whose opening can be adjusted in the vicinity of the nozzle, a throttle mechanism capable of adjusting the tip opening area steplessly, or In addition, a fine adjustment mechanism for various ejection amounts such as an open / close valve mechanism arranged in the nozzle pipe can be incorporated, and further, around the extension shaft every 180 degrees, every 120 degrees, every 60 degrees, etc. A plurality of cooling nozzles may be arranged to achieve a balanced arrangement.

    The liquid supply tank is capable of storing a predetermined amount of coolant around an appropriate position closer to the base end than the location where the liquid pump is mounted on the extension shaft, and fulfills the function of allowing an appropriate amount of coolant to be supplied to the liquid pump. It must be able to store a sufficient amount of coolant to allow the fluid pump to inject the coolant multiple times and be mountable to balance around the extension shaft. It should be connected to the liquid suction pipe of the liquid pump via a check valve, and a plurality of cylinder-type tanks are arranged at a plurality of balanced positions around the extension shaft. In addition to being able to be connected to the pump, as shown in the examples to be described later, one tank can be attached concentrically and detachably to the extension shaft, Made of synthetic resin or tempered glass It is possible to make it easy to check the remaining amount of cooling liquid by making it transparent with one of these, having a transparent window with a scale, or equipped with a remaining amount display meter. it can.

    The check valve can reliably prevent the coolant supplied from the liquid supply tank to the liquid pump from flowing back into the liquid supply tank, and has sufficient strength to withstand sufficient water pressure. In addition to the one in which one or a plurality of valve bodies are pressed against the valve seat by an elastic part of a spring, the one in which a pressure reducing mechanism is incorporated, etc. As shown, it is desirable that a filter is incorporated or combined in place, and the liquid supply tank or liquid pump can be provided in one of the appropriate positions. It can be arranged between the tank and the liquid pump.

The coolant functions to suppress friction between the drill bit and the material to be drilled during boring and to cool the drill bit that has overheated during boring, and can be reliably stored in the feed tank. It should be a liquid that has a boiling point lower than the degradation temperature of the drill bit, and it can be used for machine oil, lubricating oil, water, etc. in addition to commercially available cutting oil and cutting agent, In addition, it is possible to mix liquids that can reduce friction and provide cooling action with compressed air or other high-pressure gas to enable spraying, and to obtain equivalent friction reduction and cooling effects. Powder, granule, semi-solid, or a mixture thereof.
In the following, the structure of the present invention will be described in detail together with an embodiment representative of the present invention shown in the drawings.

1 is a perspective view of the drill bit cooler of FIG. 1, a side view of the drill bit cooler in an exploded state of FIG. 2, a side view of the drill bit cooler incorporated in the hand drill of FIG. 3, and a holder incorporated into the extension shaft of FIG. 5 is a perspective view of a liquid pump incorporated in the extension shaft of FIG. 5, a perspective view of a check valve combined with the liquid pump of FIG. 6, a perspective view of a liquid supply tank incorporated in the extension shaft of FIG. 7, and a drill of FIG. The example shown in the sectional view of the bit cooler has an extension bar type extension shaft 2 in which a shank 21 is formed at the proximal end and a bit mounting portion 22 is formed at the distal end, and the bit mounting portion 22 is mounted around the extension bar type extension shaft 2. The liquid pump 3 having a cooling nozzle 34 and a pump mechanism 30 that can inject the coolant 8 toward the drill bit 7 and a predetermined amount of coolant 8 can be stored, and the liquid pump 3 is cooled. The liquid supply tank 4 that can be connected freely is provided with a coupling mechanism 5 that can be integrated with each other, and is combined so as to be mounted in a column and concentric skewer shape along the two axial directions of the extension shaft. A typical embodiment of the drill bit cooler for a hand drill according to the present invention is shown.
In the following, according to the assembly procedure of the drill bit cooler 1 of the first embodiment, its structure will be sequentially shown.

    As can be clearly understood from these drawings, the drill bit cooler 1 for hand drills of the present invention has an extension shaft 2 longer than the total length of axial lengths of a liquid pump 3 and a liquid supply tank 4 to be described later. In addition, it should be set to an appropriate short length that does not impair the light handling of the mounting hand drill 9, and more specifically, it is set to be shorter than the entire length of the main body portion of the hand drill 9. It is composed of a straight rod-shaped body 20 having a regular hexagonal cross section made of tool steel, and a hexagonal shank 21 is formed concentrically at the base end, and a hexagonal bit mounting portion 22 is formed at the opposite end. The extension bar type hexagonal extension shaft 2 is provided.

    As shown in FIGS. 2, 4, and 5, the length around the hexagonal rod-like body 20 immediately after the bit mounting portion 22 of the extension shaft 2 is set slightly longer than the axial length of the liquid pump 3. The inner wall of the cylinder has a regular hexagonal cross-sectional shape that can be fitted to the outer peripheral wall of the hexagonal rod-shaped body 20, and the outer peripheral wall is also set to a slightly larger regular hexagonal cross-sectional shape. A regular hexagonal cylindrical mounting cylinder 51 and a circular donut shape integrated with the tip of the mounting cylinder 51 and having a diameter corresponding to the outer diameter of the liquid pump 3 and capable of supporting the tip wall 31 of the liquid pump 3 A holder 50 made of a hard material such as a hard resin or light metal made of a flat flange 53 is mounted, and the holder 50 is substantially parallel to the axial center of the mounting cylinder 51 at an appropriate position in the diameter direction of the flange 53. The liquid pump, which will be described later, toward the thickness direction 3 A guide hole 54 that allows the cooling nozzle 34 to be mounted in a penetrating manner is formed, and the base end of the mounting cylinder 51 that is opposite to the flange 53 is a flange that exceeds the total length of the liquid pump 3. A male screw 52 is engraved on the outer peripheral wall of the portion.

    As shown in FIGS. 2, 5, and 6, the liquid pump 3 is made of a soft synthetic resin torus-like container, and the mounting cylinder excluding the flange 53 and the male screw 52 range of the holder 50 is used. A length dimension corresponding to the length of 51 is set, and an elastic container having an O-shaped floating ring structure having an outer diameter substantially corresponding to the diameter of the flange 53 is formed around the mounting cylinder 51, and the central cylinder wall 32 is formed of a holder. 50 is formed in a through-hole having a regular hexagonal cross-sectional shape that can be fitted to the outer peripheral wall of the mounting cylinder 51, and the distal end wall 31 is formed as a flat wall whose base end can be brought into contact with the flange wall of the holder 50 flange 53. On the contrary, the rear end wall 33 of the flange is formed as a flat wall in which the tip of a liquid supply tank 4 bottom cover 45, which will be described later, can abut against the wall. Male screw 52 of holder 50 mounted concentrically immediately after bit mounting portion 22 Fitted in the mounting sleeve 51 an outer peripheral wall around except circumference, and those incorporating to joining the proximal end side wall of the flange 53.

    At the appropriate position of the rear end wall 33 of the liquid pump 3, a thin tube-like liquid suction pipe 35 extending in parallel with the central axis of the central cylindrical wall 32 and penetrating into the liquid pump 3 is provided. From the portion corresponding to the guide hole 54 of the holder 50 flange 53, the cooling nozzle 34 is set so that the tip is so narrow that it becomes a fine hole (or with a valve) so as not to cause liquid leakage. The liquid pump 3 as a whole constitutes the manual pump mechanism 30, and the guide hole 54 has a shape capable of appropriately guiding and supporting the tip posture of the cooling nozzle 34 when it is mounted in a penetrating manner. As a thing.

    As shown in FIGS. 2, 6, and 7, the liquid supply tank 4 includes a tank main body 40 and a bottom cover 45, and a hexagon from the rear end wall 33 of the liquid pump 3 when the entire length thereof is in the assembled state. The bottom cover 45 is made of a light metal or a hard synthetic resin having a diameter corresponding to the rear end wall 33 of the liquid pump 3. A large screw cap is formed on the inner peripheral wall of the rear end, and a tip shaft hole 47 through which the male screw 52 at the rear end of the holder 50 mounting cylinder 51 can be penetrated in the center of the tip wall. A liquid feed hole 48 through which the liquid pump 3 liquid suction pipe 35 penetrates is provided at an appropriate position where the outer diameter is closer to the tip shaft hole 47 of the tip wall. Between the outer periphery in the vicinity of the root of the male screw 52 and the peripheral edge of the tip shaft hole 47, an O A small nut 56 is sandwiched and a front end wall of the bottom lid 45 is attached to be joined to the rear end wall 33 of the liquid pump 3, and a nut 55 is screwed and tightened to the male screw 52 of the attachment cylinder 51 to be sure. The holder 50, the small O-ring 56, and the nut 55 constitute a coupling mechanism 5 that allows the liquid pump 3 and the liquid supply tank 4 to be detachably coupled.

    A check valve 60 provided at the distal end of the liquid feed pipe 6 having a filter 61 attached to the base end is connected to the liquid pump 3 liquid suction pipe 35 combined in a penetrating manner with the bottom lid 45 liquid feed hole 48. The tank body 40 is connected to a bottom lid 45 that is attached so as to be joined to the rear end wall 33 of the liquid pump 3. It is formed in a bottomed cylindrical shape made of light metal or hard synthetic resin with the end of the wing closed in the shape of a partition, and the connecting end 41 reduces the outer peripheral wall of the wing by one step so that the female of the bottom lid 45 Assuming that a male screw 42 that can be screwed into the screw 46 is engraved, the shank 21 of the hexagonal extension shaft 2 is formed in the thickness direction in the center of the partition-like rear end wall opposite to the connection end 41. A rear end shaft hole that can be penetrated is drilled, and the rear end shaft hole is connected to the peripheral wall of the hexagonal extension shaft 2. A soft resin shaft gap seal 43 that can be sealed is fitted in a fitting manner, and a synthetic resin cap can be freely attached and removed at a suitable position closer to the outer diameter than the rear end shaft hole of the rear end partition wall. The liquid supply port 44 attached to the is formed.

    In order to attach the tank body 40 to the bottom cover 45 already assembled in the hexagonal extension shaft 2, the rear end opening peripheral edge of the bottom cover 45 and the tank body 40 connecting end 41 opposite to the bottom cover 45 are provided on the outer peripheral wall. The O-ring large portion 49 is arranged so as to be sandwiched between the annular stepped portion and the hexagonal extension shaft 2 shank 21 passes through the tank body 40 connection end 41 opening so as to come out to the shaft clearance seal 43 of the rear end shaft hole. Suppose that the tank main body 40 male screw 42 is screwed to the bottom cover 45 female screw 46, and then tightly sealed and coupled.

(Operation of Example 1)
As shown in FIGS. 3 and 8, the drill bit cooler 1 of the present invention having the assembly structure as described above is attached to the chuck 90 of the hand drill 9 with the shaft gap seal 43 of the rear end shaft hole of the liquid supply tank 4. The hex extension shaft 2 shank 21 that protrudes further is connected, and the shank 70 of the drill bit 7 is inserted into the hex extension shaft 2 bit mounting portion 22 that protrudes from the center of the holder 50 flange 53 and is easily mounted. The liquid supply tank 4 is filled with a sufficient amount of, for example, tap water from the liquid supply port 44 from which the cap of the tank body 40 is removed, and the liquid supply port 44 is closed with the cap. After that, as shown by the white arrow in FIG. 8, when the outer peripheral wall of the liquid pump 3 is pressed toward the hexagonal extension shaft 2 axis to release the input, the outer peripheral wall of the liquid pump 3 made of an elastic material is released. In the process of automatically returning to the original shape, a negative pressure is generated inside, and the cooling liquid 8 in the liquid supply tank 4 is forcibly filtered through the filter 61 and the check valve 60 of the liquid feeding pipe 6. Then, the liquid pump 3 is sucked and filled with the coolant 8, and the preparation for use is completed.

    When continuous boring work is performed using the hand drill 9, the drill bit 7 is likely to fall into an overheated state. After stopping the hand drill 9 and suspending the operation, as shown by the white arrow in FIG. 8, the outer peripheral wall of the liquid pump 3 is pressed toward the hexagonal extension shaft 2 and the cooling nozzle As shown by the wavy line in FIG. 8, the coolant 8 in the liquid pump 3 is ejected by an appropriate amount several times toward the drill bit 7 through 34 to forcibly cool the drill bit 7.

    The liquid suction pipe 35 of the liquid pump 3 prevents the back flow of the coolant 8 by the check valve 60 of the liquid feed pipe 6, and the pressure in the liquid pump 3 raised by the compression operation is all The cooling nozzle 34 is stably held in the guide hole 54 of the holder 50 flange 53, and the posture of the tip toward the drill bit 7 is firmly maintained. An appropriate amount of the coolant 8 can be sprayed onto the drill bit 7, and when the input operation is released by stopping the pressing operation to the outer peripheral wall of the liquid pump 3, the elastic return force of the outer peripheral wall of the liquid pump 3 8 is returned to the outer wall shape, and the same amount of the coolant 8 injected at this time is fed into the liquid pump 3 from the liquid supply tank 4 through the filter 61, the liquid feed pipe 6 and the check valve 60. Dynamic aspiration, becomes possible to supply, it is possible to blow a cooling liquid 8 similarly by the next pressing operation the drill bit 7.

    When the coolant 8 in the liquid supply tank 4 has decreased due to continuous use, the drill bit cooler 1 is once removed from the hand drill 9 to be separated or the mounted state is maintained. When the liquid supply port 44 cap of the liquid supply tank 4 is opened and filled with a sufficient amount of the cooling liquid 8 in one of the integrated states, and then the liquid supply port 44 cap is closed and removed again. The drill bit cooler 1 can be attached to the hand drill 9 again, and the boring operation can be resumed promptly.

(Effect of Example 1)
The drill bit cooler 1 according to the first embodiment having the above-described configuration has a feed as shown in FIGS. 2, 6, 7 and 8 in addition to the features described in the section of the effect of the present invention. The suction pipe end of the liquid feed pipe 6 connecting the liquid tank 4 and the liquid pump 3 is provided with a filter 61, the delivery end is provided with a check valve 60, and fine dust or the like is present in the liquid supply tank 4. Even when it is mixed, the filter 61 removes the dust from the coolant 8 and can prevent the check valve 60 and the cooling nozzle 34 from being clogged. Thus, the function of the cutting lubricating liquid 7 is enhanced to each stage, and the cutting friction is further effectively reduced.

    In addition, as shown in FIGS. 2, 4 to 7, the liquid pump 3, the liquid supply tank 4, the liquid supply tank 4 (the tank body 40, the bottom cover 45) and the like are mutually connected to a holder 50, a nut 55, The small O-ring 56, female screw 46, male screw 42, and large O-ring 49 are connected securely and connected in a sealed manner. Individual parts can be disassembled and removed as necessary. It is easy to replace parts, and is excellent in maintainability. Moreover, the mounting cylinder 51 of the coupling mechanism 5 holder 50 is non-rotatably penetrated and mounted on the hexagonal extension shaft 2, and the liquid pump 3 and the supply pump The liquid tank 4 is mounted so as to penetrate the axial center (center of gravity) of the liquid tank 4 in a skewered manner, and the shape of the rotating liquid pump 3 made of a soft material is maintained. Pair to balance Since the combined, so that the pragmatic is obtained that allows for more stable realization of the boring work.

(Conclusion)
As described above, the drill bit cooler for hand drills according to the present invention can achieve the intended purpose evenly by its new configuration, and is easy to manufacture, and the coolant is circulated inside the conventional one. It is possible to use a general drill bit as it is without the need for an expensive drill bit that has been made possible. In addition, the structure is greatly reduced in size, weight and cost, and the durability is enhanced. In addition to being able to be economical, it is possible to carry out continuous boring operations with hand drills, so that a large number of drill bits themselves are consumed, and the work time spent on repeated drill bit replacements is lost. In the construction equipment industry and electrical construction industry, which had to spend a great deal of money and labor, various machines and equipment production factories with similar problems, hand drills and so on Not only from specialized fields such as the tool industry, machine tool industry, etc. that produce or handle drill bits, but also highly appreciated by general households who want hand drills with excellent durability and economy, such as do-it-yourself It is expected that it will be widely used and spread.

The drawings show a typical embodiment that embodies the technical idea of a drill bit cooler for a hand drill according to the present invention.
It is a perspective view which shows a drill bit cooler. It is a side view which shows the drill bit cooler in a decomposition | disassembly state. It is a side view which shows the drill bit cooler integrated in a hand drill. It is a perspective view which shows the holder integrated in an extension shaft. It is a perspective view which shows the liquid pump integrated in an extension shaft. It is a perspective view which shows the non-return valve integrated in a liquid pump. It is a perspective view which shows the liquid supply tank integrated in an extension shaft. It is sectional drawing which shows the drill bit cooler in use.

Explanation of symbols

1 Drill bit cooler 2 Hexagonal extension shaft (extension shaft)
20 Same linear rod
21 Same Shank
22 Same bit mounting part 3 Liquid pump
30 Same pump mechanism
31 Same tip wall
32 Same cylindrical wall
33 Rear end wall
34 Cooling nozzle
35 Same suction pipe 4 Liquid supply tank
40 Same tank body
41 Same connection end
42 Male thread
43 Coaxial clearance seal (for rear end shaft hole)
44 Same liquid supply port (with cap)
45 Same bottom lid
46 female thread
47 Same as above
48 Same feed hole
49 Same O-ring size 5 Coupling mechanism
50 Same holder
51 Same mounting cylinder
52 Same male screw
53 Same flange
54 Same guide hole
55 Same nut
56 Same O-ring 6 Liquid feed pipe
60 Check valve
61 Same filter 7 Drill bit
70 Same shank 8 Coolant 9 Hand drill
90 Chuck

Claims (4)

    It has an extension bar type extension shaft in which a shank for mounting a hand drill is formed at the base end of a linear bar set to a predetermined length, and a bit mounting portion is formed at the tip opposite to the shank. A cooling nozzle around the extension shaft between the bit mounting portion and the shank immediately after the bit mounting portion and a predetermined operation for injecting the coolant toward the drill bit when mounted on the bit mounting portion. A liquid pump having a pump mechanism capable of receiving and pumping the coolant toward the cooling nozzle, and storing a predetermined amount of the coolant, and connecting the liquid pump so that an appropriate amount of the coolant can be supplied freely A connecting mechanism that mounts the supplied liquid tanks in a tandem and concentric skewer shape along the axial direction with respect to the extension shaft, and allows both to be integrated between the liquid pump and the liquid tank Rotating drive Hand drill bit cooler drill, wherein the centrifugal force to balance, which was made by combining occurring extending axis in.     An extension bar type hexagonal extension shaft with a shank for mounting a hand drill at the base end of a straight rod set to a predetermined length and a bit mounting portion at the tip opposite to the shank is provided. The hexagonal extension shaft immediately after the bit mounting portion is made of a torus-like container, the rear end is a cooling liquid suction pipe, and the tip is attached to the bit mounting portion. A liquid pump having a cooling nozzle capable of injecting a cooling liquid toward the drill bit and receiving a predetermined operation and capable of pumping the cooling liquid toward the cooling nozzle is disposed. Immediately after that, at a middle position of the hexagonal extension shaft between the shank and the shank, it can be concentrically mounted around the hexagonal extension shaft and can store a predetermined amount of cooling liquid. Appropriate amount of coolant can be supplied via check valve A liquid tank that can be connected is arranged, attached to the extension shaft in a tandem, concentric skewer shape along the axial direction, and both are integrated between the liquid pump and the liquid tank. A drill bit cooler for a hand drill, characterized in that a coupling mechanism is provided, and the centrifugal force generated around the extended shaft during rotation driving is balanced.     An extension bar type hexagonal extension shaft with a shank for mounting a hand drill at the base end of a straight rod set to a predetermined length and a bit mounting portion at the tip opposite to the shank is provided. The coolant can be stored inside the hexagonal extension shaft immediately after the bit mounting part, and the coolant is sprayed toward the drill bit when the tip is attached to the bit mounting part. Possible cooling nozzles are provided, the rear end has a suction pipe for the coolant, the outer diameter can be compressed and deformed by the pressing force toward the hexagonal extension shaft, and the original shape automatically An O-shaped floating ring-shaped elastic container that can be returned is provided with a manual liquid pump whose pump mechanism itself forms a hexagonal extension shaft intermediate position immediately after the liquid pump and the shank. Can store a predetermined amount of coolant. A liquid supply tank that can be connected to an appropriate amount of coolant via a check valve in a liquid suction pipe of the liquid pump, and is arranged vertically along the axial direction with respect to the hexagonal extension shaft. A concentric skewer is mounted, and a coupling mechanism is provided between the liquid pump and the liquid supply tank so that they can be integrated with each other so that the centrifugal force generated around the extension shaft during rotation can be balanced. A drill bit cooler for hand drills, characterized in that Liquid pump, between its front end wall and the central cylinder wall hexagonal extension shaft, concentric to the hexagonal extension shaft, rotation impossible and, mounting tubular shape that can be mounted to abut against the same bit mounting portion proximal end And a hard material holder that is integrated with the tip of the mounting cylinder and has a diameter corresponding to the outer diameter of the liquid pump, and a flat flange that can support the tip wall of the liquid pump, A male screw is engraved on the outer peripheral wall of the mounting tube base end that is opposite to the flange of the holder, while a nut that is either integral or separate is provided at the tip of the liquid supply tank. The drill bit cooling for a hand drill according to any one of claims 1 to 3, wherein a coupling mechanism having a nut structure is formed, and a leading end of a liquid supply tank is detachably incorporated in a base end of the liquid pump. vessel.

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