Patent Application
20220143773
The present invention relates to a grinding device, and more particularly to a grinding device for inner holes.
A conventional grinding device for inner holes comprises a body and a tool assembly. The body has a pneumatic motor disposed inside the body, and the pneumatic motor has a driving shaft. The tool assembly has an extension shaft, a collet, and a nut. The extension shaft is connected with the driving shaft of the pneumatic motor, and is thereby simultaneously rotatable with the driving shaft. The collet is mounted on an end of the extension shaft that is away from the driving shaft for installing a tool. The nut is mounted on the end of the extension shaft away from the driving shaft, so as to compress the collet and to stabilize the tool accordingly.
In use, a wrench is necessary for assembling and disassembling the nut. To avoid the nut rotating along with the extension shaft during the process of assembling and disassembling the nut, a user has to restrict the extension shaft with another wrench. The user may then disassemble the nut by rotating the extension shaft and the nut toward different directions, respectively.
However, in such operation, the user has both hands respectively holding the two wrenches, which means the user cannot hold the conventional grinding device with the user's hands. As a result, the conventional grinding device must be laid on a worktable during the disassembling process of the nut. To conclude, the nut of the conventional grinding device is not easy to be disassembled, and changing the tool fixed in the tool assembly is therefore a difficult task.
The main objective of the present invention is to provide a grinding device for inner holes, wherein the grinding device may restrict rotation of an extension shaft thereof via a button assembly.
The grinding device for inner holes comprises a body, an extension shaft, a nut, and a button assembly. The body has a driving shaft rotatably disposed in the body and a containing hole disposed through a side of the body. The extension shaft is connected with the body and has two ends and a concave structure. One of the two ends of the extension shaft is connected with the driving shaft of the body. The concave structure is disposed on the extension shaft, and is aligned with the containing hole of the body after the extension shaft rotates with the driving shaft. The nut is screwed on the other one of the two ends of the extension shaft. The button assembly is mounted in the containing hole of the body, and is able to be pressed and to extend into the concave structure to restrict the extension shaft from rotating.
Other objectives, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
With reference to
Furthermore, the body 10 comprises an end cap 12 mounted on a front end of the body 10, so the pneumatic motor 11 may be kept in the body 10. The end cap 12 is a circular structure, and has a containing hole 121 disposed radially through a side of the end cap 12 and communicating with an inner space of the end cap 12. The containing hole 121 has an inner thread 122 disposed on a middle portion of the containing hole 121.
The tool assembly 20 is mounted with the body 10, and comprises an extension shaft 21, a collet 22, and a nut 23. The extension shaft 21 has one of two ends mounted with the driving shaft 111 of the body 10 by threads, and has at least one concave structure 211 disposed on the extension shaft 21. The at least one concave structure 211 may be aligned with the containing hole 121 of the body 10 as long as the extension shaft 21 rotates along with the driving shaft 111. In a preferred embodiment of the present invention, the extension shaft 21 is hollow, and has two said concave structures 211 diametrically opposed to each other. Each one of the two concave structures 211 may be sequentially aligned with the containing hole 121 as the extension shaft 21 keeps rotating. Furthermore, in the preferred embodiment, each concave structure 211 is a through hole disposed on the extension shaft 21. In other embodiments, the two concave structures 211 may be recesses as well.
The collet 22 is mounted in the other one of the two ends of the extension shaft 21 away from the driving shaft 111 for installing a grinding tool. The nut 23 is mounted by threads on the corresponding end of the extension shaft 21, which is away from the driving shaft 111 so as to press the collet 22 and to stabilize the grinding tool therein. In the preferred embodiment of the present invention, each one of the extension shaft 21 and the nut 23 has a side surface for wrenching 212, 231, wherein the side surface for wrenching 212 of the extension shaft 21 is optional and can be omitted.
With reference to
With reference to
Besides, in case the button assembly 30 malfunctions, as the extension shaft 21 of the grinding device has the side surface for wrenching 212, the user may still disassemble the nut 23 by means of the conventional method.
With the aforementioned technical characteristics, the grinding device for inner holes of the present invention has the following advantages. When the user needs to disassemble the nut 23 for changing the grinding tool, the user may simply hold the body 10 with one of the user's hands, and press the button 33 of the button assembly 30 with a finger of that hand, e.g. the thumb of the hand. Then the extension shaft 21 may be fixed. The user may thus hold a wrench with the other hand, and disassemble the nut 23 with the wrench. Because the grinding device for inner holes is stably held by the user, even if the grinding device is suspended with no other supports, the user may still dismount the nut 23 with ease. Therefore, the present invention hereby provides a fine solution to the problems of the conventional grinding device including difficulties in disassembling the nut and changing grinding tools.
Even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and features of the invention, the disclosure is illustrative only. Changes may be made in the details, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
