JPS625138Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the structure of a dry trimmer for dental plaster models.

The trimmers conventionally used are shown in Figures 5 and 6.
It is as shown in the figure. That is, in these figures, a is a housing, b is an electric motor, and a grinding wheel d is attached to a drive shaft c of the electric motor b that protrudes into the housing a.
With the rotation of the horizontally extending drive shaft c,
It is rotated in a nearly vertical plane. e is a water supply port provided at the bottom of the case a, f is a drain port, and a window g is opened in the case a, and the worker can access the cover on the table i from the window g. The grinding model h is inserted into the housing a, and the model to be ground h on the table i is pressed against the grinding wheel d rotated by the electric motor b to perform the desired grinding operation. In order to prevent the powder generated during this grinding operation from scattering, water is injected into the housing a from the water supply port e, and the water is applied to the grinding wheel d.
The main drawbacks of such conventional methods are as follows. That is, the powder generated during grinding becomes sticky with water and adheres to the tooth part of the model to be ground, making it difficult to peel off.

Powder generated during grinding adheres to rotating parts of the machine, increasing resistance and clogging drains.

Since it uses water, there are restrictions on where it can be installed.

Since the grinding surface of the grinding wheel is formed of only one plane, side A in Fig. 4a can be ground, but
The inner side B of the model to be ground shown in FIG. 4b cannot be ground.

This invention is particularly intended to improve the above points, and embodiments thereof will be described below with reference to the drawings.

In FIGS. 1 to 3, 1 is a housing, and an electric motor 2 is attached to the lower part of the housing 1. A base plate 4 fixed to a substantially vertical drive shaft 3 of the electric motor 2 has a plurality of A flat plate 6 is attached parallel to the base plate 4 through the blade-like connecting plates 5, and the flat plate 6 is formed into a donut shape with an opening 7 in the center.
In this case, a cloth file 8 is bonded with an adhesive, and the flat plate 6 and the cloth file 8 constitute a flat grinding section 10 having a flat grinding surface 9. The vane-shaped connecting plate 5 is attached in such a direction that an airflow from the inside to the outside is generated by the rotation of the base plate 4 and the flat plate 6 as the drive shaft 3 rotates. .

The drive shaft 3 (or the drive shaft 3 on the flat plate 6)
A shaft 12 is attached via a connector 11 to the shaft protruding on the same axis as the shaft 12, and a cylindrical support 13 is integrally formed with the shaft 12. A cylindrical grinding section 16 having an annular grinding surface 15 is constructed by fitting a cylindrical body 14 made of sandpaper onto this support 13 .

A work table 17 is provided in the housing 1 slightly above the flat grinding section 10, and a central opening 18 provided in the work table 17 is provided.
A cover plate 20 is provided which allows work to be performed on the flat grinding part 10 through the central opening 18, and which engages with a shoulder 19 formed at the edge of the central opening 18. This cover plate 20 has a hole 21 through which the portion 16 can protrude.
(Indicated by an imaginary line in FIG. 1 and a solid line in FIG. 3.) When performing grinding work with the cylindrical grinding part 16, it is fitted into the central opening 18 to perform the work. It makes it easier.

The work table 17 and the cover plate 20 are provided with a large number of dust suction holes 22 that pass through them above and below, and a powder storage chamber 23 that communicates with these dust suction holes 22 is formed on the lower side of the work table 17. A dust suction pipe 24 led out from the powder storage chamber 23 is communicated with dust suction means, that is, a dust suction device 25.

A powder scattering prevention cover 26 is attached to the work table 17, and this scattering prevention cover 26 covers the space above the work table 17 to the extent that it does not interfere with the work of the operator. It is.

In the above configuration, for example, a in FIG.
Models 27 to be ground in various shapes as shown in b and c
The operator holds the grinding surface and presses it against the flat grinding surface 9 or the annular grinding surface 15 to perform the desired grinding. At this time, by operating the dust suction device 25, the dust suction airflow is caused to flow through the central opening. 18 and the flat plate-shaped grinding part 10 , a gap 29 formed in the opening 7 of the grinding part 10 , and furthermore, the air intake pipe 24 passes through the powder storage chamber 23 from the intake hole 22 .
Since the powder is formed toward the dust suction device 25 through the dust suction device 25, the powder generated during grinding is carried by this dust suction airflow and is sucked below the work table 17. There is no risk of scattering powder around the work area. According to this invention, the grinding surface is configured in two ways, a flat plate shape and an annular shape. This invention also applies to surfaces that cannot be ground or that cannot be ground without using a device that can grind fine details, i.e., the inner side B in Fig. 4b and the base C in Fig. 4c. By using the annular grinding surface of the trimmer, detailed grinding can be achieved. Further, even when the model to be ground 27 is to be roughly ground planarly, it can be easily ground by using the flat grinding surface of the trimmer according to this invention. Therefore, with a single trimmer, it is possible to perform rough grinding on a plane or finely grind fine details by simply removing the cover plate, and it is possible to perform both rough and fine grinding. Work efficiency can be further improved. In addition, it is more economical and requires less installation space than the case where separate rough cutting and fine cutting devices are prepared.

[Brief explanation of the drawing]

Figure 1 is a hard sectional view of one embodiment of this invention;
The figure is a plan view of the half part, Figure 3 shows the state in which the work table is covered with a cover plate and the cylindrical grinding part is used, and Figure 4 a, b, and c show the three parts of the model to be ground. Figure 5 is a hard section view of the conventional product;
FIG. 6 is a front view thereof. In the figure, 1... casing, 2... electric motor,
3... Drive shaft, 4... Base plate, 5... Feather-like connecting plate, 6... Flat plate, 7... Opening, 8... Sand cloth,
9...Flat grinding surface, 10...Flat-shaped grinding part, 1
1... Connector, 12... Shaft, 13... Support, 1
4... Cylindrical body (file cloth), 15... Annular grinding surface, 16... Cylindrical grinding part, 17... Working table, 18... Center opening, 19... Shoulder, 20...
...Lid plate, 21...Port, 22...Dust suction hole, 23...
...Powder storage chamber, 24...Dust suction pipe, 25...Dust suction means (dust sucker), 26...Powder scattering prevention cover, 2
7... model to be ground, 28, 29... gaps.

Claims (1)

[Scope of utility model registration request] A housing having a work table with a large number of dust suction holes penetrating vertically, a flat grinding section having a flat grinding surface located below a central opening formed in the center of the work table, and a cylindrical grinding part having the same rotation axis as the rotation axis of the flat grinding part and having an annular grinding surface protruding above the central opening; and a cylindrical grinding part formed under the work table and communicating with the dust suction hole. A dry trimmer for a dental plaster model, comprising a powder storage chamber connected to a dust suction means, and a lid plate for closing the central opening during the grinding operation by the cylindrical grinding section.