JP3747331B2 - Trackball structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a trackball structure, and more particularly to a novel improvement for facilitating cleaning and the like by disposing a ring-shaped dust seal for pressing a ball between the ball and the ring-shaped cover without pressing down.
[0002]
[Prior art]
As this type of trackball structure conventionally used, the configuration shown in FIGS. 4 and 5 is generally adopted. That is, what is denoted by reference numeral 1 in FIGS. 4 and 5 is a case having a box shape with an overall opening shape, and a known biaxial detection mechanism (not shown) is provided in the case 1. A ball 2 is rotatably provided in the case 1, and the ball 2 is configured to be rotatable and dust-proof by an annular dust seal 3 and an annular cover 4 provided on the case 1. ing. Therefore, the annular dust seal 3 is pressed and held by the annular cover 4.
[0003]
[Problems to be solved by the invention]
Since the conventional trackball apparatus is configured as described above, the following problems exist. In other words, the conventional annular dust seal is semi-fixed while being sandwiched between the annular cover and the ball, and the gap between the annular dust seal and the annular cover is extremely small, and may clog depending on the molding condition of each molded part. May occur, making it difficult to rotate the ball. Further, when cleaning the inside of the case, a special technique is required for the disassembling work, which is unsuitable for general users.
[0004]
The present invention has been made to solve the above-described problems. In particular, a ring-shaped dust seal for holding the ball is disposed between the ball and the ring-shaped cover without being pressed down, and easy cleaning, etc. An object of the present invention is to provide a trackball structure.
[0005]
[Means for Solving the Problems]
The trackball structure according to the present invention is a trackball structure including a ball which is partially rotatable from an opening of a ring-shaped cover provided in a case, and is positioned between the ring-shaped cover and the ball provided in the opening. A ring-shaped dust seal, a circular slope formed on the ring-shaped dust seal and in sliding contact with the ball, a circular wall surface formed on the ring-shaped dust seal along the opening, and a circular protrusion formed on an outer edge of the ring-shaped dust seal; The ring-shaped dust seal is disposed between the ball and the ring-shaped cover, and the circular protrusion is joined to the upper surface of the inner edge of the ring-shaped cover.
Therefore, by dropping the annular dust seal into the gap between the ball and the annular cover, the circular protrusion is joined to the upper surface of the inner edge of the annular cover, and the annular dust seal is simply disposed between the ball and the annular cover, In addition, the ring-shaped dust seal can be easily removed when disassembly is required.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of a trackball structure according to the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected and demonstrated to a part the same as that of a prior art example, or an equivalent part.
In FIG. 1, a reference numeral 1 denotes a case having a box shape with an overall opening shape, and a known biaxial detection mechanism (not shown) is provided in the case 1. A ball 2 is rotatably provided in the case 1, and the ball 2 is configured to be rotatable and dust-proof by an annular dust seal 3 provided on an annular cover 4 on the case 1. Yes. Accordingly, the ball 2 is rotatably provided with a part exposed from the opening 4a of the ring-shaped cover 4.
[0007]
The annular dust seal 3 is provided in a state of being dropped from above into a gap 5 formed between the ball 2 and the annular cover 4, and the annular dust seal 3 is a circular inclined surface 3 a that is in sliding contact with the ball 2. And a circular wall surface 3b along the opening 4a and a circular protrusion 3c formed on the outer edge thereof, and this circular protrusion 3c is joined to the inner edge upper surface 4a along the opening 4a of the annular cover 4 Yes.
Therefore, since the ball 2 is lightly held by the dropped ring-shaped dust seal 3 (of course, the actual operation characteristics are sufficiently obtained), it is possible to absorb variations in the molded product and to be easily assembled and cleaned. Become.
[0008]
【The invention's effect】
Since the trackball structure according to the present invention is configured as described above, the following effects can be obtained. In other words, since the ring-shaped dust seal is simply dropped into the gap between the ball and the ring-shaped cover, it is possible to absorb variations in molded products and facilitate internal cleaning, which reduces the inconvenience of conventional track balls. All can be solved.
[Brief description of the drawings]
FIG. 1 is an exploded view showing a trackball structure according to the present invention.
2 is an assembled cross-sectional view of FIG. 1. FIG.
3 is an enlarged cross-sectional view of a main part of FIG.
FIG. 4 is an exploded view of a conventional structure.
5 is an assembled cross-sectional view of FIG. 4. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Case 2 Ball 3 Ring-shaped dust seal 3a Circular slope 3b Circular wall surface 3c Circular protrusion 4 Ring-shaped cover 4a Opening

Claims (1)

In a trackball structure having a ball (2) that is rotatable by exposing a part from an opening (4a) of an annular cover (4) provided in a case (1), the annular cover provided in the opening (4a) (4) and a ring-shaped dust seal (3) located between the ball (2), a circular slope (3a) formed on the ring-shaped dust seal (3) and in sliding contact with the ball (2), and the ring-shaped dust seal ( A circular wall surface (3b) formed in 3) along the opening (4a), and a circular protrusion (3c) formed on the outer edge of the annular dust seal (3), the annular dust seal (3) It is disposed between the ball (2) and the annular cover (4), and the circular protrusion (3c) is configured to be joined to the upper surface (4a) of the inner edge of the annular cover (4). Trackball structure characterized by.

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