200918396 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種用於交通工具之坐墊；特別是一種用於單車 且舒適性高之坐墊。 【先前技術】 現代社會中，人們愈來愈重視休閒生活及健身。騎乘單車不但 可達到健身效果，亦可放鬆心情。因此，當單車逐漸由一般的交 通工具轉變為休閒生活及運動健身的一部份時，使用者對單車之 各項要求便愈益增加。 由於騎乘單車時，人體的體重主要是由臀部支撐，尤其是與坐 墊接觸的部位，更是承受了極大的壓力，設若坐墊無法緩和壓力， 將降低使用者乘騎的意願。因此，坐墊的舒適性已成為消費者購 買單車坐墊時之一重要參考因素。 當騎乘單車於各種路面時，騎乘時所產生之震動常令騎乘者 (cyclist)感到不適，使得騎乘者無法舒適地長時間騎乘單車。再 者，一般市售單車坐墊皆在由硬質材料所製成之基座上，設置一 泡棉材質所製成之墊體，其墊體一般而言皆過於柔軟，縱然可稍 微分散騎乘者乘坐時所產生之壓力，但騎乘者之臀部或胯部依然 會受到硬質基座的壓迫而產生不舒適感；尚且，某些軟質材料製 成的墊體不但無法順應臀部或胯部形狀而變形，更可能集中在壓 力處。有些競賽用單車或公路用單車更使用由硬質材料一體成形 之坐墊，此時不舒適感更形嚴重。因此，坐墊之材質成為左右坐 墊舒適性的一項重要因素。 有鑑於此，提供一可具適當變形能力與緩衝能力之坐墊，乃為 200918396 此一業界亟待解決的問題。 【發明内容】 本發明之一目的在於提供一種坐墊，具有適當變形能力及緩衝 能力，使騎乘者可舒適地乘坐在本發明之坐墊上。 其中，坐墊包含一基座、一墊體以及一適於結合該基座與該墊 體之固定裝置。本發明之坐墊，其特徵為該墊體之一材料包含乙 烯醋酸乙稀共聚物（Ethylene-vinyl acetate，EVA)。藉此，本發明之 坐墊可適當地配合騎乘者之臀部及胯部變形，並同時吸收騎乘時 產生之震動，大大地提升本發明坐墊之舒適性。 為讓本發明之上述目的、技術特徵和優點能更明顯易懂，下文 係以較佳實施例配合所附圖式進行詳細說明。 【實施方式】 本發明係提供一坐墊，其主要係包含一基座、一墊體、一固定 裝置、一通氣裝置以及一導執裝置。其中，墊體之一材料包含乙 晞醋酸乙稀共聚物（Ethylene-vinyl acetate, EVA)，藉此特殊材料， 便能令墊體提供適當的緩衝及變形能力，並提供適當的支撐力。 較佳地，將乙烯醋酸乙烯共聚物材料做發泡處理製成墊體33，以 進一步提升墊體33的緩衝及變形能力。需說明的是，前述墊體所 採用之材料亦可為乙烯醋酸乙烯共聚物與其他材料之合成物質。 本發明第一實施例之坐墊1，其相關圖式請參考第1A圖至第1J 圖。本實施例之坐墊1包含一基座3卜一墊體33、一固定裝置35、 一通氣裝置37以及一導軌裝置39。基座31之材料可包含各種塑 料、碳纖維等。且如前所述，墊體33主要係由乙烯醋酸乙烯共聚 物所製成，且亦可為乙烯醋酸乙烯共聚物與其他材料之合成物質。 200918396 於本實施例中’固定裝置35適於固定結合基座31與墊體33。 固定裝置35包含三卡合銷351、三卡合帽353、三第一穿孔357 及三第二穿孔359。如第1F圖至第1J圖所示’第一穿孔357分散 形成於基座31上；第二穿孔359則形成於墊體33上，各第二穿 孔359之形成位置適與各個第一穿孔357相對應；且各個卡合銷 351分別同時穿過相應的第一穿孔357與第二穿孔359,以與卡合 帽353相互卡合’藉此固定結合基座31與墊體33。 如第1F圖、第ig圖、第π圖以及第υ圖所示，各個卡合銷 351均包含一頸部351a、一帽體351b及一卡合頭35ie ;而各個卡 合帽353均包含一帽體353a及一卡合孔353b。當卡合銷之卡 合頭351C卡合於卡合帽353之卡合孔353b中，以固定基座31與 墊體33 _，卡合銷351之帽體351b之一基部緊靠塾體33之一頂 面’卡合帽353之帽體353a之一基部緊靠基座31之—底面，而 卡合銷351之頸部351a穿置於第一穿孔357及第二穿孔359中； 換言之，基座31與塾體33適可由卡合銷351之帽體3训及 卡合帽353之帽體353a上下迫緊。 為增加坐塾1之通風性及避免固定裝置35突出於塾體33外， 墊體33之頂面更設有三溝槽33卜而穿設於墊體33上的各個第二 穿孔359則分別形成於各個溝槽331中。於此實施例中，各溝槽 331之-深度係大於(於其他實施態樣中亦可恰等於)各卡合鎖= 之一帽體高度’使固定裝置35不致凸出於墊體33外。 .於其他實施態樣中，卡合鎖351亦可由相反的方向穿置於第一 穿孔357及第二穿孔359中’同樣藉由上下迫緊以結合固定基座 200918396 31與墊體33。此時，卡合銷351之帽體351b之基部係緊靠基座 31之底面，而卡合帽353之基部緊靠墊體33之頂面。此時，各溝 槽331之一深度係大於或等於各卡合帽353之一帽體高度。再者， 卡合銷351、卡合帽353、第一穿孔357、第二穿孔359以及溝槽 331之數目非限制於三個，亦可為其他數目。需說明的是，當上述 元件之數量異於本實施例時，僅需將其相對關係作相應設計，即 可達成相同目的。因此，例如上述之等同性變化皆屬於本發明所 主張之權利範圍中。 通氣裝置37包含一第一通氣孔371及一第二通氣孔373，且第 一通氣孔371形成於基座31上，並自基座31之一頂面延伸至基 座31之一底面，用以自基座31之底面導通空氣至墊體33。第二 通氣孔373對應於第一通氣孔371形成於墊體33上，並自墊體33 之一頂面延伸至墊體33之一底面，用以自基座31之底面導通空 氣至墊體33之頂面。藉此，當騎乘者乘坐於坐墊1上，便可舒適 且不悶熱地騎乘單車。需注意的是，此通氣裝置37係由此較佳實 施例所採用，於其他實施態樣中，亦可不設置通氣裝置或是增加 通氣孔之數目，以符合坐墊重量、透氣性等各項所需。 導軌裝置39裝設於基座31之一底面上，透過此導軌裝置39, 便可經坐管、坐管束等元件而將坐墊連接固定於單車之車架上。 導軌裝置39之材料較佳地係選自鎂、鎂基合金、鈦、鈦基合金、 鎳及錄基合金所組成之群組中，以在單車元件漸趨輕量化的趨勢 下，仍能提供基座31適當的支撐。 請參考第2A圖至第2C圖，於本發明之第二實施例中，坐墊2 8 200918396 與第一實施例之坐墊1相似，其不同處係在於，第二實施例之固 定裝置35’係利用不同的手段以固定基座31及墊體33。於本實施 例中，固定裝置35’同樣包含三第一穿孔357及三第二穿孔359, 然而第一實施例所使用之三卡合銷351及三卡合帽353則係由三 斗篷狀固定銷（Cowl Fastener) 355所取代；亦即，一個斗篷狀固 定銷355適可提供與一組卡合銷351及卡合帽353相似的功能。 如第2A圖所示，於本實施例之固定裝置35’中，第一穿孔357 同樣分散形成於基座31上，第二穿孔359同樣形成於墊體33上， 且各第二穿孔359之形成位置適與各個第一穿孔357相對應。固 定裝置35’僅利用各個斗篷狀固定銷355分別同時穿過相應的第一 穿孔357與第二穿孔359，上下夾迫固定基座31與墊體33。 如第2B圖及第2C圖所示，斗篷狀固定銷355包含一頸部355a、 一帽體355b及一不連續錐部355c。藉此，當斗篷狀固定銷355固 定基座31與墊體33時，斗蓬狀固定銷355之帽體355b之一基部 緊靠墊體33之頂面，斗蓬狀固定銷355之不連續錐部355c之一 抵持部緊靠基座31之底面，且斗蓬狀固定銷355之頸部355a穿 置於第一穿孔357及第二穿孔359中；換言之，基座31與墊體33 適可由斗蓬狀固定銷355之帽體355b及不連續錐部355c上下迫 緊。 相似地，本實施例中，墊體33之頂面亦設有三溝槽331，且穿 設於墊體33上的各個第二穿孔359係分別形成於各個溝槽331 中。於此實施例中，各溝槽；331之一深度係大於（於其他實施態樣 中可為等於）各斗篷狀固定銷355之一帽體高度，使固定裝置35 200918396 不致凸出於墊體33外。 於，、他實施雜中’本實施例之斗蓬狀固絲奶同樣亦可由 相反的方向穿置於第—穿孔357及第二穿孔359中。此時，斗蓬 狀固定銷355之帽體355b之基部係緊靠基座31之底面，而斗蓬 狀固疋銷355之不連續錐部355c之抵持部緊靠墊體之頂面。 此時’各溝槽331之-深度係大於或等於各斗蓬狀固定銷扮之 一不連續錐體高度。再者，斗蓬狀固定銷奶、第一穿孔w、第 ，穿孔359以及溝槽331之數目非限制於三個，亦可為其他數目。 需說明的是’當上述元件之數量異於本實施例時，同樣僅需將其 相對關係作相應設計，即可達成相同目的。因此，例如上述之等 同性變化皆屬於本發明所主張之權利範圍中。本實施例之其他元 件之結構及材料與上述第—實施例相似，故在此不另資述。 本發明之第二實施例為一坐塾3，其相關圖式請參考第3A圖至 第3C®。其中’本實施例之坐塾3相似於第二實施例之坐塾2。 詳言之，坐墊3之基座31、墊體33、通氣裝置37、導軌裝置39 及其他元件皆相同於第二實施例之坐塾2之各項元件。其不同處 在於第三實施例之斗蓬狀固定銷355之數目係為六個，且第三實 施例之塾體33之頂面上並非形成三個溝槽，而是形成了六沈孔 用以谷置斗蓬狀固定銷355之帽體355b或不連續錐部355c。 相應地，基座31包含六第一穿孔357,墊體33包含六第二穿孔 359刀別形成於六沈孔333中。於此實施例中各沈孔之一深 度係大於（於其他實施態樣中亦可為等於）各斗篷狀固定銷355之 中I體鬲度。相似於第二實施例，本實施例之各斗篷狀固定銷3 5 $ 200918396 係正向插入第一穿孔357及第二穿孔359中。然於其他實施態樣， 各斗篷狀固定銷355亦可反向插入第一穿孔357及第二穿孔359 中；此時，各沈孔331之一深度則大於或等於各斗篷狀固定銷355 之一不連續錐體高度。 於其他實施態樣中，本發明之固定裝置亦可為各種不同之固定 手段，如螺合、鉚合、膠合、嵌合或其他手段，凡可固定本發明 乙烯醋酸乙烯共聚物材質之墊體與及基座之固定手段，皆可應用 於本發明中。其中，本發明之坐墊若使用如第一實施例、第二實 施例或第三實施例中所述之固定手段，甚至是利用螺合，以固定 墊體與基座時，此時固定裝置係為可拆卸地固定基座與墊體。當 遭遇需要更換遭污損之墊體或更換不同尺寸、樣式之墊體或其他 不同情況時，墊體更可自基座上拆卸，並進行更換墊體的作業。 如此更大大增加本發明墊體之實用性及產業競爭力。再者，本發 明之坐墊更不僅限於應用在單車上，相同的概念亦可應用於機 車、汽車等各種交通工具中。 由於本發明坐墊之墊體材料係包含乙烯醋酸乙烯共聚物，此材 料可因應壓力分布而變形，迎合騎乘者之身形。當騎乘者乘坐在 本發明之坐墊時，騎乘者之重量將使墊體呈現適當的變形，以符 合騎乘者臀部與胯部之形狀。另一方面，此材料又可吸收騎乘時 產生之震動，提供良好的緩衝及支撐能力，大幅提昇騎乘時之舒 適性。 上述之實施例僅用來例舉本發明之實施態樣，以及闡釋本發明 之技術特徵，並非用來限制本發明之保護範疇。任何熟悉此技術 11 200918396 者可輕易完成之改變或均等性之安排均屬於本發明所主張之範 圍，本發明之權利保護範圍應以申請專利範圍為準。 【圖式簡單說明】 ’ 第1A圖係為本發明第一實施例之前視圖； 第1B圖係為本發明第一實施例之後視圖； 第1C圖係為本發明第一實施例之側視圖； 第1D圖係為本發明第一實施例之俯視圖； 第1E圖係為本發明第一實施例之仰視圖； 第1F圖係為本發明第一實施例之爆炸圖； 第1G圖係為本發明第一實施例另一視角之爆炸圖； 第1Η圖係為本發明第一實施例之組合示意圖； 第11圖係為本發明第一實施例之部分剖面爆炸圖； 第1J圖係為本發明第一實施例之部分剖面組合圖； 第2Α圖係為本發明第二實施例之俯視圖； 第2Β圖係為本發明第二實施例之部分剖面爆炸圖； 第2C圖係為本發明第二實施例之部分剖面組合圖； 第3Α圖係為本發明第三實施例之俯視圖； 第3Β圖係為本發明第三實施例之部分剖面爆炸圖；以及 第3C圖係為本發明第三實施例之部分剖面組合圖。 【主要元件符號說明】 1 坐墊 2 坐塾 3 坐塾 31 基座 33 墊體 331 溝槽 333 沈孔 35 固定裝置 12 200918396 351 卡合鎖 351a 頸部 351b 帽體 351c 卡合頭 353 卡合帽 353a 帽體 353b 卡合孔 355 斗蓬狀固定銷 355a 頸部 355b 帽體 355c 不連續錐部 357 第一穿孔 359 第二穿孔 35， 固定裝置 37 通氣裝置 371 第一通氣孔 373 第二通氣孔 39 導執裝置 13200918396 IX. Description of the Invention: TECHNICAL FIELD OF THE INVENTION The present invention relates to a seat cushion for a vehicle; and more particularly to a seat cushion for bicycles and high comfort. [Prior Art] In modern society, people are paying more and more attention to leisure life and fitness. Riding a bicycle can not only achieve fitness, but also relax. As a result, as bicycles gradually change from general transportation tools to part of leisure life and exercise, the demand for bicycles is increasing. When riding a bicycle, the weight of the human body is mainly supported by the buttocks, especially the part that is in contact with the seat cushion, and it is subjected to great pressure. If the seat cushion cannot relieve the pressure, the user's willingness to ride is reduced. Therefore, the comfort of the seat cushion has become an important reference factor for consumers to purchase bicycle cushions. When riding a bicycle on various roads, the vibration generated during riding often makes the cyclist feel uncomfortable, making it impossible for the rider to comfortably ride the bicycle for a long time. Furthermore, generally, the commercially available bicycle seat cushions are provided on a base made of a hard material, and a cushion body made of a foam material is generally provided, and the cushion body is generally too soft, even though the rider can be slightly dispersed. The pressure generated by the ride, but the rider's buttocks or ankles are still subject to the compression of the hard base and cause discomfort; however, some soft material mats can not only conform to the shape of the buttocks or crotch. Deformation, more likely to focus on the pressure. In some competitions, bicycles or road bicycles use a cushion that is integrally formed of a hard material, and the discomfort is more serious. Therefore, the material of the seat cushion is an important factor in the comfort of the left and right seat cushions. In view of this, providing a cushion with appropriate deformability and cushioning capability is an urgent problem to be solved in 200918396. SUMMARY OF THE INVENTION One object of the present invention is to provide a seat cushion having suitable deformability and cushioning capability so that the rider can comfortably ride on the seat cushion of the present invention. The seat cushion includes a base, a cushion body and a fixing device adapted to join the base and the cushion body. The seat cushion of the present invention is characterized in that one of the materials of the mat body comprises Ethylene-vinyl acetate (EVA). Thereby, the seat cushion of the present invention can appropriately match the deformation of the rider's buttocks and ankles, and at the same time absorb the vibration generated during riding, greatly improving the comfort of the seat cushion of the present invention. The above described objects, technical features and advantages of the present invention will become more apparent from the following description. [Embodiment] The present invention provides a seat cushion which mainly comprises a base, a cushion body, a fixing device, a ventilation device and a guiding device. Among them, one of the mat body materials contains Ethylene-vinyl acetate (EVA), and the special material can provide the cushion body with proper cushioning and deformation ability and provide appropriate supporting force. Preferably, the ethylene vinyl acetate copolymer material is foamed to form the mat 33 to further enhance the cushioning and deforming ability of the mat 33. It should be noted that the material used for the mat body may also be a synthetic material of ethylene vinyl acetate copolymer and other materials. For the seat cushion 1 of the first embodiment of the present invention, please refer to FIGS. 1A to 1J for the related drawings. The seat cushion 1 of the present embodiment includes a base 3, a cushion body 33, a fixing device 35, a venting device 37, and a rail device 39. The material of the susceptor 31 may contain various plastics, carbon fibers, and the like. As described above, the pad body 33 is mainly made of an ethylene vinyl acetate copolymer, and may be a synthetic material of an ethylene vinyl acetate copolymer and other materials. 200918396 In the present embodiment, the fixing device 35 is adapted to fix the coupling base 31 and the pad body 33. The fixing device 35 includes a three-engagement pin 351, a three-engagement cap 353, three first perforations 357, and three second perforations 359. As shown in FIGS. 1F to 1J, the first through holes 357 are formed on the base 31; the second through holes 359 are formed on the pad body 33, and the second through holes 359 are formed at positions corresponding to the respective first through holes 357. Correspondingly, each of the engaging pins 351 passes through the corresponding first through hole 357 and the second through hole 359 at the same time to engage with the engaging cap 353 to thereby fix the combined base 31 and the pad body 33. As shown in FIG. 1F, ig, π, and υ, each of the engaging pins 351 includes a neck 351a, a cap 351b, and an engaging head 35ie; and each of the engaging caps 353 includes A cap 353a and an engaging hole 353b. When the engaging pin 351C of the engaging pin is engaged with the engaging hole 353b of the engaging cap 353 to fix the base 31 and the pad body 33_, the base of one of the caps 351b of the engaging pin 351 abuts against the body 33. One of the top surfaces of the cap 353a of the cap 353 abuts against the bottom surface of the base 31, and the neck 351a of the engaging pin 351 is inserted into the first through hole 357 and the second through hole 359; The base 31 and the body 33 are adapted to be pressed up and down by the cap body 3 of the engaging pin 351 and the cap 353a of the engaging cap 353. In order to increase the ventilation of the seat 1 and to prevent the fixing device 35 from protruding beyond the body 33, the top surface of the pad body 33 is further provided with three grooves 33, and the second holes 359 which are disposed on the pad body 33 are respectively formed. In each of the grooves 331. In this embodiment, the depth of each groove 331 is greater than (in other embodiments, it may be equal to) each of the snap locks = one of the cap heights such that the fixing device 35 does not protrude from the pad body 33. . In other embodiments, the snap lock 351 can also be inserted into the first through hole 357 and the second through hole 359 by the opposite direction ′, which is also pressed by the upper and lower sides to join the fixed base 200918396 31 and the pad body 33. At this time, the base of the cap 351b of the engaging pin 351 abuts against the bottom surface of the base 31, and the base of the engaging cap 353 abuts against the top surface of the pad body 33. At this time, the depth of one of the grooves 331 is greater than or equal to the height of the cap of each of the engaging caps 353. Furthermore, the number of the engaging pin 351, the engaging cap 353, the first through hole 357, the second through hole 359, and the groove 331 is not limited to three, and may be other numbers. It should be noted that when the number of the above components is different from that of the embodiment, only the relative relationship needs to be designed correspondingly, that is, the same purpose can be achieved. Therefore, for example, the above-described equivalent changes are within the scope of the claims of the present invention. The ventilation device 37 includes a first ventilation hole 371 and a second ventilation hole 373. The first ventilation hole 371 is formed on the base 31 and extends from a top surface of the base 31 to a bottom surface of the base 31. Air is conducted from the bottom surface of the base 31 to the pad body 33. The second vent 373 is formed on the pad body 33 corresponding to the first vent hole 371, and extends from a top surface of one of the pad bodies 33 to a bottom surface of the pad body 33 for conducting air from the bottom surface of the pedestal 31 to the pad body. The top of 33. Thereby, when the rider rides on the seat cushion 1, the bicycle can be comfortably and without sultry riding. It should be noted that the venting device 37 is used in the preferred embodiment. In other embodiments, the venting device may not be provided or the number of vent holes may be increased to meet the weight of the seat cushion, the air permeability, and the like. need. The rail device 39 is mounted on a bottom surface of the base 31. Through the rail device 39, the seat cushion can be connected and fixed to the bicycle frame via a seat tube or a tube bundle. The material of the rail device 39 is preferably selected from the group consisting of magnesium, magnesium-based alloys, titanium, titanium-based alloys, nickel, and nickel-based alloys to provide a trend toward a lighter weight of bicycle components. The base 31 is suitably supported. Referring to FIGS. 2A to 2C, in the second embodiment of the present invention, the seat cushion 2 8 200918396 is similar to the seat cushion 1 of the first embodiment, and the difference is that the fixing device 35' of the second embodiment is The base 31 and the pad body 33 are fixed by different means. In this embodiment, the fixing device 35' also includes three first through holes 357 and three second through holes 359. However, the three engaging pins 351 and the three engaging caps 353 used in the first embodiment are fixed by three cloaks. Replaced by a Cowl Fastener 355; that is, a cloak-like fixing pin 355 is adapted to provide a similar function as a set of engaging pins 351 and engaging caps 353. As shown in FIG. 2A, in the fixing device 35' of the embodiment, the first through holes 357 are also dispersedly formed on the base 31, and the second through holes 359 are also formed on the pad body 33, and the second through holes 359 are The formation position is adapted to correspond to each of the first through holes 357. The fixing device 35' passes through the respective first through holes 357 and the second through holes 359, respectively, by the respective cap-shaped fixing pins 355, and clamps the fixing base 31 and the pad body 33 up and down. As shown in FIGS. 2B and 2C, the cap-shaped fixing pin 355 includes a neck portion 355a, a cap body 355b, and a discontinuous taper portion 355c. Thereby, when the pedestal-shaped fixing pin 355 fixes the base 31 and the pad body 33, one of the bases of the cap body 355b of the cloak-like fixing pin 355 abuts against the top surface of the pad body 33, and the discontinuous cone of the cloak-like fixing pin 355 One of the abutting portions 355c abuts against the bottom surface of the base 31, and the neck portion 355a of the cloak-like fixing pin 355 is inserted into the first through hole 357 and the second through hole 359; in other words, the base 31 and the pad body 33 are suitable. The cap 355b and the discontinuous taper 355c of the cloak-like fixing pin 355 can be pressed up and down. Similarly, in the embodiment, the top surface of the pad body 33 is also provided with three grooves 331, and the second holes 359 which are formed on the pad body 33 are respectively formed in the respective grooves 331. In this embodiment, one of the grooves 331 has a depth greater than (in other embodiments, may be equal to) one of the cap heights of each of the cap-shaped fixing pins 355, so that the fixing device 35 200918396 does not protrude from the pad body. 33 outside. Then, the cloak-like solid milk of the present embodiment can also be placed in the opposite direction through the first through hole 357 and the second through hole 359. At this time, the base of the cap 355b of the cloak-like fixing pin 355 abuts against the bottom surface of the base 31, and the abutting portion of the discontinuous tapered portion 355c of the clogging-shaped fixing pin 355 abuts against the top surface of the pad body. At this time, the depth of each groove 331 is greater than or equal to the height of a discontinuous cone of each of the cloak-like fixing pins. Furthermore, the number of the cloak-like fixing pin milk, the first perforations w, the first, the perforations 359, and the grooves 331 is not limited to three, and may be other numbers. It should be noted that when the number of the above components is different from that of the present embodiment, the same purpose can be achieved by merely designing the relative relationship accordingly. Therefore, for example, the above-described equivalent changes are within the scope of the claims of the present invention. The structures and materials of the other components of this embodiment are similar to those of the above-described first embodiment, and therefore are not described herein. The second embodiment of the present invention is a seat 3, and the related drawings are referred to in Figs. 3A to 3C®. Wherein the seat 3 of the present embodiment is similar to the seat 2 of the second embodiment. In detail, the base 31 of the cushion 3, the cushion body 33, the venting means 37, the rail means 39 and other components are identical to the components of the seat 2 of the second embodiment. The difference is that the number of the cloak-like fixing pins 355 of the third embodiment is six, and the top surface of the body 33 of the third embodiment is not formed with three grooves, but is formed by six counterbore. The cap 355b or the discontinuous taper 355c of the cloak-like fixing pin 355 is placed in the valley. Correspondingly, the base 31 includes six first perforations 357, and the pad body 33 includes six second perforations 359 formed in the six counterbore 333. In this embodiment, one of the counterbore depths is greater than (in other embodiments, may be equal to) the I body twist of each of the captive fixing pins 355. Similar to the second embodiment, each of the cap-shaped fixing pins 3 5 $ 200918396 of the present embodiment is inserted into the first through hole 357 and the second through hole 359 in the forward direction. In other embodiments, the cloak-like fixing pins 355 can also be inserted into the first through holes 357 and the second through holes 359 in opposite directions; at this time, the depth of one of the counter holes 331 is greater than or equal to that of each of the cloak-shaped fixing pins 355. A discontinuous cone height. In other embodiments, the fixing device of the present invention may also be a variety of different fixing means, such as screwing, riveting, gluing, fitting or other means, and the pad body of the ethylene vinyl acetate copolymer material of the invention may be fixed. The means for fixing the base and the base can be applied to the present invention. Wherein, if the seat cushion of the present invention uses the fixing means as described in the first embodiment, the second embodiment or the third embodiment, even if the screw body is used to fix the cushion body and the base, the fixing device is The base and the cushion body are detachably fixed. When it is necessary to replace the soiled body or replace the different size, style of the body or other different conditions, the body can be removed from the base and replaced. This greatly increases the utility and industrial competitiveness of the mat of the present invention. Furthermore, the seat cushion of the present invention is not limited to application to bicycles, and the same concept can be applied to various vehicles such as motorcycles and automobiles. Since the cushion material of the seat cushion of the present invention contains an ethylene vinyl acetate copolymer, the material can be deformed in response to the pressure distribution to cater to the shape of the rider. When the rider rides on the seat cushion of the present invention, the weight of the rider will cause the cushion body to be properly deformed to conform to the shape of the rider's buttocks and ankles. On the other hand, this material absorbs the vibration generated during riding, provides good cushioning and support, and greatly improves the comfort during riding. The embodiments described above are only intended to illustrate the embodiments of the present invention, and to explain the technical features of the present invention, and are not intended to limit the scope of the present invention. Any changes or equivalents that can be easily made by those skilled in the art can be made within the scope of the present invention. The scope of the present invention should be determined by the scope of the patent application. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a front view of a first embodiment of the present invention; FIG. 1B is a rear view of a first embodiment of the present invention; FIG. 1C is a side view of a first embodiment of the present invention; 1D is a plan view of a first embodiment of the present invention; FIG. 1E is a bottom view of the first embodiment of the present invention; FIG. 1F is an exploded view of the first embodiment of the present invention; Explosion diagram of another perspective of the first embodiment of the invention; FIG. 1 is a schematic diagram of a combination of the first embodiment of the present invention; FIG. 11 is a partial cross-sectional exploded view of the first embodiment of the present invention; A cross-sectional view of a first embodiment of the present invention; a second plan view showing a second embodiment of the present invention; a second partial view showing a partial cross-sectional exploded view of the second embodiment of the present invention; 2 is a plan view of a third embodiment of the present invention; FIG. 3 is a partial cross-sectional exploded view of a third embodiment of the present invention; and FIG. 3C is a third embodiment of the present invention. A partial cross-sectional combination of the embodiments. [Main component symbol description] 1 Seat cushion 2 Seat 3 Seat 31 Base 33 Pad 331 Groove 333 Counterbore 35 Fixing device 12 200918396 351 Engagement lock 351a Neck 351b Cap 351c Engagement head 353 Engagement cap 353a Cap 353b Engagement hole 355 Cloak-like fixing pin 355a Neck 355b Cap 355c Discontinuous taper 357 First perforation 359 Second perforation 35, Fixing device 37 Ventilation device 371 First vent hole 373 Second vent hole 39 Guide Executive device 13