JPH0243607Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a chuck that allows a polishing shaft-equipped tool to be easily attached to and detached from the rotating shaft of a power tool such as a compressed air tool or an electric tool.

Conventional technology Conventionally, a brush with a shaft attached to the rotating shaft of a handy type power tool body driven by compressed air or electricity, a tool with a shaft made of cloth, non-woven fabric made of synthetic resin fibers fixed with abrasive grains, paper, etc. The installation is
As shown in FIG. 5, an outer annular body 21 with a tapered tip is attached to a rotating shaft 20 of a power tool, and a bolt 22 screwed into the outer annular body 21 has a tapered portion 22' cut into several pieces in the axial direction. A collector chuck 23 consisting of the following is used.The bolt 22 of the chuck 23 is loosened, the round bar shaft 25 of the shafted tool 24 is inserted, and then the bolt 22 is tightened with a spanner to clamp and fix the shafted tool. It is normal to enter.

As another example, as shown in FIG. 6, a chuck main body 27 having a tapered portion 26 cut into several pieces to be screwed onto the rotating shaft, and a nut 28 having a tapered portion 28' to be screwed thereto. Natsuto 2
A collet chuck is used to attach and detach the round bar shaft 25 of the shaft-equipped tool by tightening and loosening the inner diameter of the tool 8, or by expanding the inner diameter.

Problems to be Solved by the Invention In the above-mentioned collect chuck, the bolt 22 and nut 28 must be loosened and tightened, so a spanner to fix the rotating shaft so that it does not rotate at the work site, and the bolt 22 Two spanners are required to tighten the nut 28, which puts a burden on the operator and takes time to attach and detach.The tools also wear out quickly and need to be replaced frequently, making it difficult to replace them. It takes a lot of time to replace the parts, and speedy replacement is not possible, which affects work efficiency.

Furthermore, the mounting shaft of the tool with a shaft is a round bar,
The degree of tightening varies from person to person, and the mounting tool may loosen depending on the degree of tightening or vibration during use, causing the tool to fly out during rotation and cause injury, which also poses a safety problem.

In order to solve these problems, a special patent application was filed in 1980.
No. 121266 has developed a shaft-mounted tool mounting device for power tools, but in this device, if the sliding ring that locks the shaft-mounted tool is pushed backwards by another object during polishing work, There is a risk that the tool with a shaft may come off due to the tool becoming unlatched, which poses some safety concerns.

Therefore, the present invention aims to further improve the above-mentioned device and provide a much safer quick chuck equipped with a stopper mechanism to prevent the shafted tool from flying out during work. .

Means for Solving the Problems Means for solving the above problems will be explained using FIGS. 1 to 4 corresponding to the embodiment.

The present invention has a hollow shaft 1 that is screwed onto the rotating shaft of the power tool body, and a step 2 is added to the tip of the hollow shaft 1 to form a tip cylinder portion 3 with a large diameter.
and a square shaft hole 4 and a receiver into which the square shaft part 16 of the shafted abrasive tool and the brim-like base part 15 of the abrasive material support formed at the root of the square shaft are fitted inside the hollow shaft 1 and the front cylinder part 3. A chuck main body 6 having a concentric opening 5 and holding a steel ball 7 at a midpoint in the length direction of the square shaft hole 4 so as to be freely protruding and retracting from the inner and outer surfaces of the peripheral wall 1a, and a hollow shaft 1 of the chuck main body. A flange 9 that is fitted into the inner side and pushes the steel ball 7 into the hollow shaft 1, and an annular cavity 10 in front of the flange 9, between the flange 9 and a stopper ring 12 that is appropriately fixed to the hollow shaft 1. The steel ball 7 is normally stopped in contact with the stepped portion 2 of the front tube portion 3 by a spring 13 built in the spring 13, and the steel ball 7 is inserted into the engagement groove 17 provided around the square shaft portion 16 of the tool with a shaft. The structure of the quick chuck for a power tool includes a cylindrical finder 8 having a diameter substantially the same as or slightly smaller than the outer diameter of the front cylinder part 3, which is engaged with the front cylinder part 3.

Function When installing the polishing tool 14 with a shaft, insert the finer 8 into the spring 13 and pull it backward as shown in FIG. When the square shaft part 16 of the shafted tool 14 is inserted into the chuck body 6, the steel ball 7 is once pushed up into the annular recess 10 and the square shaft part 16 is fitted and inserted into the square shaft hole 4, and the flanged base 15 is fitted into the socket 5 in the front tube part 3. Then, when you release your hand from the finder 8, the finder 8 is instantly moved by the force of the spring 13. The step part 2 of the front barrel part 3 moves forward.
At the same time, the shafted tool is held in a state in which the steel ball 7 is pushed into the engagement groove 17 of the square shaft part 16 fitted into the square shaft hole 4 of the hollow shaft 1 and locked by the projecting edge 9. is fixed concentrically with the rotation axis, and the finder 8 is normally stopped by the stepped portion 2 of the front barrel 3, so that even if the tip of the chuck hits another object and is pressed during polishing, the front barrel 3 serves as a cover and a stopper for the finder 8, so there is no risk of the finder 8 sliding backwards, and therefore there is no danger of the shafted tool flying out during the polishing operation, resulting in excellent safety. In addition, when removing a tool with a shaft, pull the finder 8 backward by hand, and the position shown in Fig. 4 will be achieved, and the annular recess 10 inside the finder 8 will align with the position of the steel ball 7, making it easy to remove the tool with a shaft. It can be removed.

Example Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a quick chuck for a power tool showing one embodiment of the present invention. A tapered front cylinder part 3 with a large diameter is provided, and a hexagonal square shaft part 16 of a tool with a polishing shaft is connected to the inside of the first half of the hollow shaft 1 and the inside of the front cylinder part 3. A chuck body 6 made of metal is provided in which a hexagonal square shaft hole 4 and a socket 5 are concentrically formed into which a flanged base 15 of an abrasive material support at the square shaft root part can be respectively fitted.

A steel ball 7 is held at a longitudinally intermediate position of the square shaft hole 4 formed in the chuck body 6 through a notch hole 1b bored in the radial direction in the circumferential wall 1a of the hollow shaft 1 so as to be able to move in and out. There is. The steel ball 7 is not limited to one location, but may be provided at several locations around it.

A finder 8 made of a metal cylinder is fitted on the outside of the hollow shaft 1 of the chuck body 6, and inside the finder 8, when the front end is in contact with the stepped part 2 of the front cylinder part 3, A ridge 9 for pushing and locking the steel ball 7 into the engagement groove 17 provided around the middle part of the square shaft portion 16 of the shafted tool in which the steel ball 7 is inserted into the square shaft hole 4.
and an annular recess 10 on the front side thereof, and a retaining ring 1 fixed to the outside of the projecting edge 9 and the hollow shaft 1 with a ring 11.
2, the finder 8 is normally stopped by hitting the step 2 at the rear of the front barrel 3, and the flange 9 aligns with the position of the steel ball 7, thereby stopping it. When pressed inward and sliding the finder 8 backward, the annular recess 10 reaches the outer periphery of the steel ball 7, and the steel ball 7 protrudes to the outer periphery of the hollow shaft 1. The square shaft portion 16 can be inserted and removed.

Wire brush, polishing cylinder (cloth, paper with abrasive grains fixed to it, flaps of non-woven fabric fixed in a radial pattern)
The shaft-equipped tool 14 for polishing is the same as the conventional one, and the shaft of the shaft-equipped tool is also a hexagonal square shaft section 16, and the middle part of the square shaft section 16 has a hole when inserted. An engagement groove 17 into which the steel ball 7 is fitted and engaged is provided around the circumference. Further, the brim-shaped base 15 of this square shaft portion 16 and the socket 5 in the front cylinder portion 3 are formed in a shape that allows them to fit together.

The square shaft hole 4 provided in the chuck main body 6 is not limited to a hexagonal shape, and can be used for the square shaft portion 1 of a tool with a shaft.
In addition to 6, it is also possible to manufacture the cross-sectional shape to be triangular or quadrangular.

Effects of the invention Since the present invention has the above-mentioned configuration, by pulling the finder backward, the square shaft part provided on the tool with a polishing shaft can be inserted into the square shaft hole in the chuck body attached to the rotating shaft. In operation, the tool shaft can be easily attached and detached without the need for aligning and inserting the cutting tool, or the need for an adapter between the cutting tool and the spindle, or the need to wedge the key and keyway. When released, the chuck moves forward instantly and is stopped by the rear part of the front cylinder part of the chuck body, and the steel ball is locked in the engagement groove of the square shaft part of the shafted tool in an accurate state of engagement.
The steel ball has the effect of preventing the hollow shaft on the drive shaft side and the tool with a polishing shaft from coming off, and the fitting between the square shaft hole and the entire length of the square shaft of the tool with a polishing shaft, and the socket in the tip cylinder part. By fitting and holding the brim-shaped base of the abrasive material support and sharing the role of transmitting rotational power, the steel ball and the engagement groove into which it engages are more easily Not only can it prevent indentation and deformation, but it also has a simple structure, can hold the chuck accurately and firmly, and can downsize the chuck.Also, even if the tip of the chuck is pressed during polishing work, the tip of the chuck body can be easily held. serves as a stopper and cover for the finder, so the danger of the finder sliding inadvertently and the tool with the polishing shaft flying out can be completely eliminated, providing a highly safe quick chuck. In addition, since the square shaft hole of the hollow shaft that fits and holds the square shaft and the flanged base of the shaft root and the socket of the tip cylinder are made as one piece, centering is easy and machining accuracy is improved. obtained, tool runout,
There is no vibration. Furthermore, polishing tools with shafts are subject to heavy wear and must be replaced frequently, and since they can be easily installed and removed without the need for tools, work efficiency can be significantly improved.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing an embodiment of the present invention, with the attached state of a tool with a shaft indicated by a phantom line, Fig. 2 is a front view of Fig. 1, and Fig. 3 is a line A-A in Fig. 1. 4 is a partially vertical side view showing the attachment and detachment of a shaft-equipped tool; FIGS. 5 and 6 are partially cutaway explanatory views showing a conventional collet chuck. 1...Hollow shaft, 2...Step part, 3...Top tube part, 4...Square shaft hole, 5...Socket, 6...Chuck body, 7...Steel ball,
8...Finder, 9...Protrusion, 10...Annular recess, 1
2... Retaining ring, 13... Spring, 14... Shafted tool,
15...flange-shaped base, 16...square shaft part.

Claims (1)

[Scope of utility model registration request] A large-diameter front tube portion 3 is provided at the tip of a hollow shaft 1 that is screwed onto a rotating shaft of a power tool, and the hollow shaft 1 and the front tube portion 3 are connected to each other.
Inside, a square shaft hole 4 and a socket 5 are continuously formed into which the square shaft part 16 provided on the shafted polishing tool 14 and the brim-like base part 15 of the abrasive material support at its root are fitted, respectively. ,
A chuck body 6 which holds a steel ball 7 so as to be freely retractable in and out of the hollow shaft 1 at an intermediate position of the square shaft hole 4.
and an engagement groove 17 which is fitted into the hollow shaft 1 and has a steel ball 7 formed inside thereof around the square shaft portion 8 of the shafted tool 14.
A projecting edge 9 that engages with the ridge 9, and an annular recess 10 in front of the ridge 9
The outer diameter of the front barrel part 3 is normally stopped and held at the step part 2 of the front barrel part 3 by a spring 13 interposed between the projecting edge 9 and a stop ring 12 fixed to the hollow shaft 1. and a cylindrical finder 8 with the same diameter or a slightly smaller diameter.