This application claims priority to Taiwanese Invention Patent Application No. 109100340, filed on Jan. 6, 2020.
The disclosure relates to a chain plate, and more particularly to an inner chain plate.
Referring to
Further referring to
The inner chain plate 12 has an inner surface 125 and an outer surface 126 that are opposite to each other in a thicknesswise direction of the inner chain plate 12. The inner surface 125 has two circular regions 127 corresponding respectively to the end segments 121 and surrounding the protruding rings 123, respectively. The inner surface 125 further has an intermediate region 128 corresponding to the intermediate segment 122 and disposed between and connected to the circular regions 127. The circular regions 127 and the intermediate region 128 of the inner surface 126 are all planar surfaces, such that the teeth of the sprocket may not enter the engaging spaces 14 smoothly and even baffled during entrance into the engaging spaces 14.
Taiwanese Patent Application No. 106114820 provides a conventional bicycle chain. Taiwanese Patent Application Nos. 095114730 and 106101166, which were filed by the applicant, also provide conventional chain plates.
Therefore, an object of the disclosure is to provide a chain plate that can alleviate at least one of the drawbacks of the prior art.
The chain plate includes two end segments spaced apart from each other in a lengthwise direction, and an intermediate segment disposed between and connected to the end segments.
Each of the end segments has a rod hole having a center, and one of the end segments further has an extension portion extending away from the center of the rod hole of the one of the end segments in the lengthwise direction. A first distance from the center of the rod hole of the one of the end segments to an edge of the one of the end segments in the lengthwise direction is greater than a second distance from the center of the rod hole of the one of the end segments to an edge of the one of the end segments in a widthwise direction.
The chain plate has an inner surface and an outer surface that are opposite to each other in a thicknesswise direction.
The inner surface has a first inclined region corresponding to a peripheral region of the one of the end segments, and a second inclined region corresponding to the extension portion and between the first inclined region and the rod hole of the one of the end segments. The first inclined region and the second inclined region are inclined toward the outer surface.
The intermediate segment is formed, at the inner surface, with a recess that is recessed in the thicknesswise direction toward the outer surface and that has two parallel edges extending in the widthwise direction and spaced apart from each other in the lengthwise direction.
Other features and advantages of the disclosure will become apparent in the following detailed description of the embodiment (s) with reference to the accompanying drawings, of which:
Before the disclosure is described in greater detail, it should be noted that where considered appropriate, reference numerals or terminal portions of reference numerals have been repeated among the figures to indicate corresponding or analogous elements, which may optionally have similar characteristics.
Referring to
The chain plate 2 includes two end segments 3 spaced apart from each other in a lengthwise direction (D1) of the chain plate 2, an intermediate segment 4 disposed between and connected to the end segments 3, and two protruding rings 5 protruding respectively from the end segments 3.
Each of the end segments 3 is in a shape of a semi-ellipse, and has a hole portion 31 and an extension portion 32. Referring specifically to
The protruding rings 5 protrude respectively from the hole portions 31 of the end segments (3) in the thicknesswise direction (D3), and surround respectively the rod holes 311 of the end segments 3. That is to say, for each of the protruding rings 5, a center of the protruding ring 5 is on the central axis 312 of the rod hole 311 of a corresponding one of the hole portions 31.
Further referring to
The intermediate segment 4 is formed, at the inner surface 6, with a recess 41 that is recessed in the thicknesswise direction (D3) toward the outer surface 7. The recess 41 has two parallel edges 411 extending in the widthwise direction (D2) and spaced apart from each other in the lengthwise direction (D1).
The inner surface 6 has two first inclined regions 61, two second inclined regions 62, a planar region 63, two curved regions 64, two third inclined regions 65 and two circular regions 66. One of the first inclined regions 61, one of the second inclined regions 62 and one of the circular regions 66 correspond to a corresponding one of the end segment 3. The planar region 63, the curved regions 64 and the third inclined regions 65 correspond to the intermediate segment 4. Since the end segments 3 are substantially the same, a detailed description of the surface contour of only one of the end segments 3 (i.e., the first inclined region 61, the second inclined region 62 and the circular region 66) is provided for the sake of brevity.
The first inclined region 61 corresponds to the peripheral region of the end segment 3, the second inclined region 62 corresponds to the extension portion 32, and the circular region 66 corresponds to the hole portion 31 and surrounds the rod hole 311. Specifically, the first inclined region 61 extends radially from a circular periphery of the circular region 66, and is inclined toward the outer surface 7 to define a peripheral chamfer on the end segment 3. The second inclined region 62 is disposed between the first inclined region 61 and the rod hole 311, and more particularly between the first inclined region 61 and the hole portion 31. The second inclined region 62 extends from the circular periphery of the circular region 66 away from the rod hole 311 toward an edge of the extension portion 32 in the lengthwise direction (D1), and is inclined toward the outer surface 7 to define a chamfer on the extension portion 32. In this embodiment, the second inclined region 62 (i.e., the extension portion 32) is in a crescent shape and is curved along a periphery of the rod hole 311. In this embodiment, a first angle 611 of the first inclined region 61 relative to the outer surface 7 is greater than a second angle 621 of the second inclined region 62 relative to the outer surface 7 (see
The third inclined regions 65 are spaced apart from each other in the widthwise direction (D2) and extend in the lengthwise direction (D1), and are adjacent respectively to two sides of the recess 41 that are opposite to each other in the widthwise direction (D2). The third inclined regions 65 are inclined toward the outer surface 7 to respectively define two chamfered edges on the intermediate segment 4.
The planar region 63 is disposed between the third inclined regions 65, defines a bottom of the recess 41, and has a width 631 in the widthwise direction (D2) not greater than two thirds of a diameter 313 of each of the rod holes 311. The curved regions 64 extend in the widthwise direction (D2), and define two side portions of the recess 41 that are opposite to each other in the lengthwise direction (D1). Each of the curved regions 64 is disposed between the planar region 63 and a corresponding one of the circular regions 66, and is connected to the corresponding one of the circular regions 66 at a corresponding one of the edges 411 of the recess 41. Specifically, each of the curved regions 64 is connected to the planar region 63 with a conjunction line 60 therebetween. The conjunction lines 60 of the curved regions 64 extend in the widthwise direction (D2) and are spaced apart from each other in the lengthwise direction (D1). The conjunction lines 60 and the edges 411 are parallel to one another.
Referring to
It should be noted that the smaller the second angle 621 of the second inclined region 62, the longer the second inclined region 62 in the lengthwise direction (D1), which facilitates the entrance of the tooth 91 into the engaging space 84 and the rotation of the chain 8 around the sprocket. Besides, the smaller the width 631 of the planar region 63 in the widthwise direction (D2), the bigger the areas of the third inclined regions 65, which also facilitates the entrance of the tooth 91 into the engaging space 84. For example, in a case where the chain 8 is used as a bicycle chain in a bicycle and surrounds a freewheel and a sprocket that are arranged in a front-rear direction, shifting gears may be relatively smooth, and interference in the chain 8 engaging the rear freewheel and the front sprocket can be reduced even when a chainline of the chain 8 is greatest (i.e., when the chain 8 engages a greatest toothed-wheel of the sprocket and a greatest toothed-wheel of the freewheel, or engages a smallest toothed-wheel of the sprocket and a smallest toothed-wheel of the freewheel).
Referring to
Referring to
To sum up, by virtue of the extension portion 32 and the inner surface 6 of the chain plate 2 having the first and second inclined regions 61, 62, engagement of the chain 8 and the sprocket is relatively smooth and stable.
In the description above, for the purposes of explanation, numerous specific details have been set forth in order to provide a thorough understanding of the embodiment(s). It will be apparent, however, to one skilled in the art, that one or more other embodiments may be practiced without some of these specific details. It should also be appreciated that reference throughout this specification to “one embodiment,” “an embodiment,” an embodiment with an indication of an ordinal number and so forth means that a particular feature, structure, or characteristic may be included in the practice of the disclosure. It should be further appreciated that in the description, various features are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of various inventive aspects, and that one or more features or specific details from one embodiment may be practiced together with one or more features or specific details from another embodiment, where appropriate, in the practice of the disclosure.
While the disclosure has been described in connection with what is (are) considered the exemplary embodiment(s), it is understood that this disclosure is not limited to the disclosed embodiment(s) but is intended to cover various arrangements included within the spirit and scope of the broadest interpretation so as to encompass all such modifications and equivalent arrangements.
Number | Date | Country | Kind |
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109100340 | Jan 2020 | TW | national |
Number | Name | Date | Kind |
---|---|---|---|
4265134 | Dupoyet | May 1981 | A |
7325391 | Oishi | Feb 2008 | B1 |
8734280 | Oishi | May 2014 | B2 |
9303726 | Fukumori | Apr 2016 | B2 |
9541159 | Wang | Jan 2017 | B2 |
10618598 | Fukumori | Apr 2020 | B2 |
20150308542 | Fukumori | Oct 2015 | A1 |
20170067535 | Fukumori | Mar 2017 | A1 |
20180201341 | Wu | Jul 2018 | A1 |
20190048973 | Fukumori | Feb 2019 | A1 |
20190048974 | Fukumori | Feb 2019 | A1 |
20190100278 | Fukumori | Apr 2019 | A1 |
Number | Date | Country |
---|---|---|
3348859 | Jul 2018 | EP |
201538870 | Oct 2015 | TW |
201910663 | Mar 2019 | TW |
Entry |
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Search Report issued to European counterpart application No. 20173522.2 by the EPO dated Oct. 30, 2020. |
Search Report appended to an Office Action issued to Taiwanese counterpart application No. 109100340 by the TIPO dated Sep. 25, 2020, with an English translation thereof. |
Number | Date | Country | |
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20210207684 A1 | Jul 2021 | US |