JPS6117814Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device that allows a grindstone to be easily and firmly supported on a main shaft in a disk grinder or the like.

Disc grinders must simply and firmly support a disc-shaped grinding wheel on the main shaft that rotates at high speed, and for safety reasons, the mounting of the grinding wheel against the rotating main shaft must be determined based on the rotational inertia of the grinding wheel, the load on the grinding wheel, etc. It is necessary to prevent the grinding wheel from loosening, and furthermore, unless the grinding wheel is supported as close to the grinder body as possible, it will be difficult to operate the grinder. In view of this point, the inventions disclosed in Japanese Patent Publication Nos. 41-10954 have been proposed. However, in this case, it is necessary to insert the outer circumference of the whetstone dowel into the corner face of the whetstone holder with the corner faces aligned, but this dowel is only inserted by screwing into the connector of the screw rod. Therefore, it cannot be inserted unless the corner surfaces of the whetstone holder and the corner surfaces of the stopper match exactly, and furthermore, this corner surface alignment cannot be done visually because of grinding. For this reason, it is a difficult task to hold the grindstone between the grindstone holder and the fitting and align the corner portions of the grindstone with each other.

The present invention has been devised in view of this point, and will be described below based on the illustrated embodiments.

In the figure, 1 is the main body of the disk dainder,
Although not shown, a power source such as an air motor or an electric motor is built into the main body, and the rotational force of this power source is transmitted to the main shaft 2 directly or via a reduction gear. The main shaft 2 may be parallel to or coaxial with the longitudinal axis of the main body 1, or it may be orthogonal to the longitudinal axis of the main body 1, as shown.

A screw hole 2a is cut into the axis of the tip end of the main spindle 2 so that the grindstone G can be attached, and a grindstone holder 3 is fitted to the outer periphery of the main spindle so that the grindstone holder 3 rotates together with the main spindle 2. It is what you do.

As shown in detail in FIG. 4, this whetstone holder 3 has a short tubular shape with a flange 3a on the outer periphery of the side that contacts the grinding wheel surface, and its inner periphery 3b is a rectangular surface such as a hexagon or square. The two opposing sides are cut into flat shapes so that when the center of the disc-shaped grindstone G is clamped between the grindstone holder and the metal fitting 4 described later, a tool such as a spanner can be hooked and firmly fastened. Part 3c
It is formed by forming.

A contact metal fitting 4 is provided to face the grindstone receiving metal fitting 3 and to fit into the rectangular inner circumferential surface 3a. This fitting 4 has a cylindrical shape and has a flange 4a formed on the outer periphery of one end thereof, and the outer periphery of the main body of the fitting 4 connected to the flange 4a has a length that is equal to or slightly larger than the thickness of the grindstone G. It has a circular shape 4b that fits into the mounting hole of the grindstone G, and the outer peripheral shape on the tip side from this is made into the rectangular inner peripheral surface 3a of the grindstone holder 3 so that it can be fitted and rotated as one. The inner peripheral surface 3a is formed in the same angular shape 4c, for example, hexagonal, quadrangular, etc., and the inside of this fitting is bored with a through hole 4f along the axis, which fits into the tip of the main shaft 2, and the central part thereof A ring-shaped inner flange 4d projecting inward is formed on the inner circumferential surface of the flange 4a, and a locking pin fitting groove 4e is provided on the inner circumferential surface inward of the flange 4a. A fixing bolt 5 is inserted into this metal fitting 4, which is a bolt with a hexagonal socket, and a ring 5a is formed on the outer periphery of the head and on the seat side of the bolt. The diameter should be the same as or slightly smaller than the through hole 4f of the fitting, so that the bolt can slide inside the hole in the longitudinal direction of the fitting, and the bolt will not accidentally separate from the fitting. After inserting the bolt 5 into the through hole of the stopper fitting, a snap ring or the like 6 is fitted into the stop pin fitting groove 4e of the stopper fitting so as to be locked by the ring 5a, and the bolt 5 is inserted into the through hole 4f. The bolt and the fitting are integrated so that they can rotate freely within the bolt and slide freely between the snap spring and the inner flange.

According to the present invention, a bolt having a flange slightly smaller than the diameter of the through hole of the metal fitting is inserted into the hole in a rotatable and sliding manner on the outer periphery of the fixing bolt. After inserting the bolt 5 into the through hole of the metal fitting to prevent the bolt from accidentally coming off, fit a snap spring or the like 6 into the stop pin fitting groove 4e of the metal fitting so that it is locked by the ring 5a, and then tighten the bolt. 5 is designed to be able to rotate and slide freely, so when using this bolt to support the whetstone between the whetstone holder fixed to the main shaft of the Darainder and the metal fitting, it is possible to rotate and slide freely within the square hole of the whetstone holder. The metal fitting can be easily inserted by aligning it with the square hole, and then the bolt provided on the receiving metal fitting is tightened, so supporting and replacing the grindstone can be done easily and quickly, and it is also compatible with conventional grinding wheel support devices. Similarly, since the grindstone is supported in close proximity to the main body of the dainder, it has the advantage that its operability and workability are not impaired.

[Brief explanation of the drawing]

Figure 1 is an external view of the partially broken Dalainder.
Figures 2 and 3 are enlarged cross-sectional views of the grinding wheel support device.
FIG. 2 shows the state in which the grindstone is supported, FIG. 3 shows the state in which it is supported, FIG. 4 is an explanatory view of the grindstone holder, and FIG. 5 is an explanatory view of the metal fitting. 1...Main body, 2...Main shaft, 3...Whetstone holder,
4...Metal fittings, 5...Bolts, G...Whetstones.

Claims (1)

[Scope of utility model registration request] A grindstone holder that fits onto the main shaft of the grinder,
The whetstone is held in cooperation with the metal fitting that fits inside the whetstone holder, and the inner circumferential surface of the whetstone holder is made into a rectangular surface, and the outer shape of the metal fitting is changed to the inside of the whetstone holder. In a device that has a square shape that is inserted so as to be locked on the peripheral surface, and the grindstone is held between the two, the length of the square part of the abutment fitting is set to Before the bolt to be inserted is screwed into the grinding wheel holder, it is determined so that it fits and locks on the inner circumferential square surface of the grinding wheel holder, and a flange is formed on the outer periphery of the bolt to be inserted into the corresponding metal fitting. A support device for a grindstone in a grinder, which is integrally provided between a snap spring engaged in a through hole of the metal fitting and an inner flange so as to prevent the bolt from slipping out and to be rotatable and slidable.