TW202426755A - Door bolt lockset - Google Patents

Door bolt lockset Download PDF

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Publication number
TW202426755A
TW202426755A TW111148783A TW111148783A TW202426755A TW 202426755 A TW202426755 A TW 202426755A TW 111148783 A TW111148783 A TW 111148783A TW 111148783 A TW111148783 A TW 111148783A TW 202426755 A TW202426755 A TW 202426755A
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TW
Taiwan
Prior art keywords
lock
bolt
lock body
movable bolt
door
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TW111148783A
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Chinese (zh)
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TWI806807B (en
Inventor
楊耀坤
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彰彬工業股份有限公司
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Publication date
Application filed by 彰彬工業股份有限公司 filed Critical 彰彬工業股份有限公司
Priority to TW111148783A priority Critical patent/TWI806807B/en
Priority claimed from TW111148783A external-priority patent/TWI806807B/en
Application granted granted Critical
Publication of TWI806807B publication Critical patent/TWI806807B/en
Publication of TW202426755A publication Critical patent/TW202426755A/en

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Abstract

A door bolt lockset for locking a door. The door bolt lockset comprises a lock body and a bolt buckle. The lock body comprises a first lock body portion and a second lock body portion which are pivoted to each other. The first lock body portion is provided with a coded lock part and a positioning pin. The second lock body portion is provided with a lock buckle, a track part and a plurality of movable bolts, the plurality of movable bolts are slidably arranged on the track part, the plurality of movable bolts have a positioning hole. The bolt buckle comprises an installation part and an extension part which are connected to each other. The extension part has a lock hole.

Description

門栓鎖具組Door bolt lock set

本發明是關於一種門栓鎖具組,安裝於門上後利用活動栓、密碼鎖件的搭配,具有快速、安全、便利上鎖的功效。The present invention relates to a door bolt lock set, which is installed on the door and uses a movable bolt and a combination lock to achieve fast, safe and convenient locking.

門鎖對於現今社會而言是家家戶戶必備的產品,其具備著阻止外人開啟門戶進而入侵室內的功能,進而達到保護家中財產、人生安全、勸阻外人入侵之功效。Door locks are a must-have product for every household in today's society. They have the function of preventing outsiders from opening the door and invading the room, thereby protecting the home's property, life safety, and discouraging outsiders from intrusion.

而門鎖的種類有相當多種,其中一種較為常見的門鎖可如台灣專利第M313710號「門栓結構」,這是一種門栓類型的門鎖,其主要結構包含有軸座、栓座、栓軸,實際應用時,是將軸座安裝於門上,而栓座則安裝於對應門邊,接續操作位於軸座的栓軸使其部分插入栓座,此時門便無法再開啟,接續再將第二鎖具鎖扣於栓軸以限制其滑移幅度,如此再不解除後續掛上的第二鎖具的情況下,是不可能將門打開的,以此達到將門上鎖的目的。然而由前述內容可以得知,此種類型的門鎖,需要準備有第二鎖具,才能完成門的上鎖步驟,若是第二鎖具遺失、忘記攜帶的情況下是沒辦法完成上鎖的。There are many types of door locks. One of the more common door locks is Taiwan Patent No. M313710 "Door Bolt Structure". This is a door bolt type door lock. Its main structure includes a shaft seat, a bolt seat, and a bolt shaft. In actual application, the shaft seat is installed on the door, and the bolt seat is installed on the corresponding door side. Then, the bolt shaft located on the shaft seat is operated to partially insert it into the bolt seat. At this time, the door cannot be opened anymore. Then, the second lock is locked to the bolt shaft to limit its sliding range. In this way, it is impossible to open the door without releasing the second lock that is hung later, thereby achieving the purpose of locking the door. However, as can be seen from the above content, this type of door lock requires a second lock to complete the door locking step. If the second lock is lost or forgotten, the door cannot be locked.

有鑑於前述內容,如何解決習知的門栓類型鎖具,在於使用上需要額外準備第二鎖具問題,實是有必要解決的。In view of the above, it is necessary to solve the problem that the known bolt type locks require a second lock to be prepared for use.

本發明是以鎖體搭配活動栓進行結合的創作,在本發明鎖體安裝於門、栓扣安裝於門邊,第一鎖體部扣合於第二鎖體部且活動栓部分插設於鎖洞時,在密碼鎖件未解鎖的情況下,鎖扣無法脫離密碼鎖件,即是說第一鎖體與第二鎖體部無法解除扣合,如此定位插件會維持插設於活動栓定位孔的狀態,以致活動栓無法藉由操作而位移,進而達到將門上鎖的目的,且無需如習知門栓類型鎖具,上鎖時需額外準備第二鎖具,本發明確實改善習知產品之問題。The present invention is a creation combining a lock body with a movable bolt. In the present invention, the lock body is installed on the door, the bolt is installed on the door edge, the first lock body part is buckled on the second lock body part and the movable bolt part is inserted into the lock hole, and the lock buckle cannot be separated from the combination lock when the combination lock is not unlocked, that is, the first lock body and the second lock body part cannot be unlocked, so the positioning plug-in will maintain the state of being inserted into the positioning hole of the movable bolt, so that the movable bolt cannot be displaced by operation, thereby achieving the purpose of locking the door, and there is no need to prepare a second lock when locking like the conventional bolt type lock. The present invention has indeed improved the problems of the conventional products.

為達成上述目的與功效,本發明提供一種門栓鎖具組,其包括:一鎖體,其包括有相互樞設的一第一鎖體部、一第二鎖體部,該第一鎖體部設置有一密碼鎖件、一定位插件,該第二鎖體部設置有一鎖扣、一軌道件、一活動栓,該活動栓滑設於該軌道件,該活動栓具有一定位孔,該第一鎖體部扣合於該第二鎖體部時,該鎖扣對應該密碼鎖件,該定位插件插設於該定位孔,該活動栓無法滑動;一栓扣,其包括有相連之一安裝部、一延伸部,該延伸部具有一鎖洞,該鎖洞供該活動栓活動穿設。In order to achieve the above-mentioned purpose and effect, the present invention provides a door bolt lock set, which includes: a lock body, which includes a first lock body part and a second lock body part pivotally arranged with each other, the first lock body part is provided with a combination lock and a positioning plug-in, the second lock body part is provided with a lock buckle, a track member, and a movable bolt, the movable bolt is slidably arranged on the track member, the movable bolt has a positioning hole, when the first lock body part is buckled with the second lock body part, the lock buckle corresponds to the combination lock, the positioning plug-in is inserted into the positioning hole, and the movable bolt cannot slide; a bolt buckle, which includes a connected mounting part and an extension part, the extension part has a lock hole, and the lock hole is used for the movable bolt to movably pass through.

為更加了解本發明之實施方式還請搭配圖式進行觀看,如第一圖至五圖所呈現,本發明為一種門栓鎖具組,其包括:一鎖體1,其包括有相互樞設的一第一鎖體部11、一第二鎖體部12,該第一鎖體部11設置有一密碼鎖件111、一定位插件113,該第二鎖體部12設置有一鎖扣121、一軌道件122、一活動栓2,該活動栓2滑設於該軌道件122,該活動栓2具有一定位孔23,該第一鎖體部11扣合於該第二鎖體部12時,該鎖扣121對應該密碼鎖件111,該定位插件113插設於該定位孔23,該活動栓2無法滑動;一栓扣4,其包括有相連之一安裝部41、一延伸部42,該延伸部42具有一鎖洞421,該鎖洞421供該活動栓2活動穿設。To better understand the implementation of the present invention, please refer to the drawings. As shown in the first to fifth figures, the present invention is a door bolt lock set, which includes: a lock body 1, which includes a first lock body part 11 and a second lock body part 12 which are mutually pivoted. The first lock body part 11 is provided with a combination lock 111 and a positioning plug 113. The second lock body part 12 is provided with a lock buckle 121, a track member 122, and a movable bolt 2. The movable bolt 2 Sliding on the track member 122, the movable bolt 2 has a positioning hole 23. When the first lock body 11 is buckled with the second lock body 12, the lock buckle 121 corresponds to the combination lock 111, and the positioning plug-in 113 is inserted in the positioning hole 23, and the movable bolt 2 cannot slide; a bolt buckle 4 includes a connected mounting portion 41 and an extension portion 42. The extension portion 42 has a lock hole 421, and the lock hole 421 is for the movable bolt 2 to be movably inserted.

接續上述內容進一步詳述本發明之實施方式,如第六圖所呈現,本實施例中欲上鎖的門100是以下拉式門為例,本發明實際應用時,鎖體1是以第二鎖體部12安裝於門100靠近邊緣的部位,而栓扣4以安裝部41安裝於邊框200,接續如第七圖所呈現將門100下拉關上,此時活動栓2的位置會對應於該鎖洞421,接續操作活動栓2使其部分插入鎖洞421,如此一來門100便無法上拉開啟,接續如第八圖所呈現將第一鎖體部11扣合於第二鎖體部12,第二鎖體部12的鎖扣121便會如第三圖所呈現,扣於密碼鎖件111的彈扣112,而活動栓2會如第四、五圖所呈現部分插設於活動栓2的鎖洞421,在密碼鎖件111未解鎖的情況下,密碼鎖件111的彈扣112會鎖死,不會經由受力而內縮,鎖扣121無法脫離密碼鎖件111,即是說第一鎖體部11與第二鎖體部12無法解除扣合,如此定位插件113會維持插設於活動栓2定位孔23的狀態,以致活動栓2無法藉由操作而位移,進而達到將門100上鎖的目的,且無需如習知門栓類型鎖具,上鎖時需額外準備第二鎖具,本發明確實改善習知產品之問題,實具有新穎性、進步性。The implementation of the present invention is further described in detail in the sixth figure. In this embodiment, the door 100 to be locked is a pull-down door. When the present invention is actually applied, the lock body 1 is mounted on the edge of the door 100 by the second lock body portion 12, and the latch 4 is mounted on the frame 200 by the mounting portion 41. Then, as shown in the seventh figure, the door 100 is locked. 0 is pulled down to close, at which time the position of the movable bolt 2 will correspond to the lock hole 421, and the movable bolt 2 is operated to be partially inserted into the lock hole 421, so that the door 100 cannot be pulled up to open, and then the first lock body 11 is buckled into the second lock body 12 as shown in the eighth figure, and the lock buckle 121 of the second lock body 12 will be buckled into the combination lock as shown in the third figure. 111, and the movable bolt 2 is partially inserted into the lock hole 421 of the movable bolt 2 as shown in the fourth and fifth figures. When the combination lock 111 is not unlocked, the spring buckle 112 of the combination lock 111 will be locked and will not be retracted by force. The buckle 121 cannot be separated from the combination lock 111, that is, the first lock body 11 and the second lock body 1 2 cannot be released, so the positioning plug 113 will maintain the state of being inserted into the positioning hole 23 of the active bolt 2, so that the active bolt 2 cannot be displaced by operation, thereby achieving the purpose of locking the door 100, and there is no need to prepare a second lock when locking like the conventional bolt type lock. The present invention indeed improves the problems of the conventional products and is truly novel and progressive.

如第五圖所呈現,其中該第一鎖體部11扣合於該第二鎖體部12時,該第一鎖體部11與該第二鎖體部12形成一容置空間13,本實施例中容置空間13所放置的物品300是鑰匙為例,有些人為追求謹慎,門上會設置有多道鎖,或是門後還有一道門有上鎖,而本發明鎖體1的容置空間13可以放置其他鎖的鑰匙,以增加開啟多道鎖時的便利度。As shown in the fifth figure, when the first lock body 11 is buckled with the second lock body 12, the first lock body 11 and the second lock body 12 form a receiving space 13. In this embodiment, the item 300 placed in the receiving space 13 is a key. Some people, in pursuit of prudence, will install multiple locks on the door, or there is another door behind the door with a lock. The receiving space 13 of the lock body 1 of the present invention can be used to place keys of other locks to increase the convenience of opening multiple locks.

如第九圖所呈現,進一步包括有一輔助鎖具5,該輔助鎖具5活動鎖於該活動栓2,該輔助鎖具5鎖於該活動栓2時,該活動栓2滑移幅度受限,即是說設置有輔助鎖具5時,即使解鎖密碼鎖件111且第一鎖體部11的定位插件113也以脫出定位孔23,活動栓2插入鎖洞421的部分仍是無法滑出,由此可知輔助鎖具5的設置得以增加本發明的防護力。As shown in FIG. 9, an auxiliary lock 5 is further included. The auxiliary lock 5 is movably locked to the movable bolt 2. When the auxiliary lock 5 is locked to the movable bolt 2, the sliding range of the movable bolt 2 is limited. That is to say, when the auxiliary lock 5 is provided, even if the combination lock 111 is unlocked and the positioning plug 113 of the first lock body 11 is also out of the positioning hole 23, the part of the movable bolt 2 inserted into the lock hole 421 still cannot slide out. It can be seen that the provision of the auxiliary lock 5 can increase the protective power of the present invention.

如第十、十一圖所呈現,其中該第二鎖體部12與該活動栓2之間設置有一省力彈簧3,其中該省力彈簧3呈現扭力彈簧的樣態,該省力彈簧3包括有一短臂段31、一長臂段32,該短臂段31與該長臂段32之間相連有一扭轉段33,該短臂段31與該第二鎖體部12相連,該長臂段32與該活動栓2相連,如此操作活動栓2滑移時,僅需稍微施力省力彈簧3便會將活動栓2帶往對應的方向,以此確實達到省力的功效。As shown in the tenth and eleventh figures, a force-saving spring 3 is arranged between the second lock body 12 and the movable bolt 2, wherein the force-saving spring 3 is in the form of a torsion spring, and includes a short arm section 31 and a long arm section 32, wherein a torsion section 33 is connected between the short arm section 31 and the long arm section 32, wherein the short arm section 31 is connected to the second lock body 12, and the long arm section 32 is connected to the movable bolt 2, so that when the movable bolt 2 is operated to slide, only a slight force is required to apply the force-saving spring 3 to bring the movable bolt 2 to the corresponding direction, thereby achieving the effect of saving effort.

如第二圖所呈現、六至八圖所呈現,提供一種軌道件122的樣態,其中該軌道件122包括有一件體段1221,該件體段1221相連於該第二鎖體部12,該件體段1221二端分別相連有一D環部1222,該活動栓2滑設於各D環部1222。As shown in the second figure and in Figures 6 to 8, a track member 122 is provided, wherein the track member 122 includes a body segment 1221, the body segment 1221 is connected to the second lock body 12, and the two ends of the body segment 1221 are respectively connected to a D-ring portion 1222, and the movable bolt 2 is slidably disposed on each D-ring portion 1222.

如六至八圖所呈現,其中該活動栓2具有一限位部24,該限位部24位各D環部1222之間,如此可避免操作不慎導致活動栓2完全脫離軌道件122。As shown in FIGS. 6 to 8 , the movable bolt 2 has a limiting portion 24 , and the limiting portion 24 is located between the D-ring portions 1222 , so as to prevent the movable bolt 2 from being completely separated from the track member 122 due to careless operation.

如第一至八圖所呈現,其中該活動栓2包括有相連之一扳動部21、一栓部22,該栓部22滑設於該軌道件122,該栓部22與扳動部21呈板狀且彼此之間夾有小於180度之一夾角θ,以致扳動部21是相對栓部22呈現彎折的樣態,如此一來僅需捏持扳動部21即可輕易的操作活動栓2於軌道件122滑移。As shown in the first to eighth figures, the movable bolt 2 includes a pull portion 21 and a bolt portion 22 connected to each other. The bolt portion 22 is slidably disposed on the track member 122. The bolt portion 22 and the pull portion 21 are plate-shaped and have an angle θ less than 180 degrees between them, so that the pull portion 21 is bent relative to the bolt portion 22. In this way, the movable bolt 2 can be easily operated to slide on the track member 122 by only pinching the pull portion 21.

由上所述者僅為用以解釋本發明之較佳實施例,並非企圖據以對本發明做任何形式上之限制,是以,凡有在相同之發明精神下所做有關本發明之任何修飾或變更者,為其他可據以實施之型態且具有相同效果者,皆仍應包括在本發明意圖保護之範疇內。The above is only used to explain the preferred embodiments of the present invention, and is not intended to limit the present invention in any form. Therefore, any modifications or changes made to the present invention under the same spirit of the invention, which are other forms that can be implemented and have the same effect, should still be included in the scope of protection intended by the present invention.

綜上所述,本發明「門栓鎖具組」,其實用性及成本效益上,確實是完全符合產業上發展所需,且所揭露之結構發明亦是具有前所未有的創新構造,所以其具有「新穎性」應無疑慮,又本發明可較習用之結構更具功效之增進,因此亦具有「進步性」,其完全符合我國專利法有關發明專利之申請要件的規定,乃依法提起專利申請,並敬請鈞局早日審查,並給予肯定。In summary, the "Door Bolt Lock Set" of the present invention is indeed fully in line with the needs of industrial development in terms of practicality and cost-effectiveness, and the disclosed structural invention is also an unprecedented innovative structure, so there is no doubt that it is "novel". In addition, the present invention can improve the effectiveness of the commonly used structure, so it is also "progressive". It fully complies with the provisions of the Patent Law of the Republic of my country on the application requirements for invention patents. Therefore, a patent application is filed in accordance with the law, and we sincerely request the Jun Bureau to review and affirm it as soon as possible.

1:鎖體 11:第一鎖體部 111:密碼鎖件 112:彈扣 113:定位插件 12:第二鎖體部 121:鎖扣 122:軌道件 1221:件體段 1222:D環部 13:容置空間 2:活動栓 21:扳動部 22:栓部 23:定位孔 24:限位部 3:省力彈簧 31:短臂段 32:長臂段 33:扭轉段 4:栓扣 41:安裝部 42:延伸部 421:鎖洞 5:輔助鎖具 100:門 200:邊框 300:物品 θ:夾角 1: Lock body 11: First lock body 111: Combination lock 112: Spring buckle 113: Positioning plug-in 12: Second lock body 121: Lock buckle 122: Track piece 1221: Body section 1222: D-ring section 13: Accommodation space 2: Active bolt 21: Pulling part 22: Bolt part 23: Positioning hole 24: Limiting part 3: Effort-saving spring 31: Short arm section 32: Long arm section 33: Twist section 4: Latch buckle 41: Mounting part 42: Extension part 421: Lock hole 5: Auxiliary lock 100: Door 200: Frame 300: Item θ: Angle

第一圖為本發明立體示意圖。 第一A圖為本發明鎖體展開示意圖。 第二圖為本發明部分分解示意圖。 第三圖為第一圖線段III-III剖面示意圖。 第四圖為第一圖線段IV-IV剖面示意圖。 第五圖為容置空間容納有鑰匙示意圖。 第六圖為本發明實際應用步驟一示意圖。 第七圖為本發明實際應用步驟二示意圖。 第八圖為本發明實際應用步驟三示意圖。 第九圖為活動栓上鎖有輔助鎖具示意圖。 第十圖為本發明設置有省力彈簧的示意圖。 第十一圖為本發明設置有省力彈簧的活動栓移動示意圖。 The first figure is a three-dimensional schematic diagram of the present invention. Figure 1A is a schematic diagram of the unfolded lock of the present invention. Figure 2 is a schematic diagram of a partial decomposition of the present invention. Figure 3 is a schematic diagram of the cross-section of line segment III-III of the first figure. Figure 4 is a schematic diagram of the cross-section of line segment IV-IV of the first figure. Figure 5 is a schematic diagram of a key being contained in the storage space. Figure 6 is a schematic diagram of the first practical application step of the present invention. Figure 7 is a schematic diagram of the second practical application step of the present invention. Figure 8 is a schematic diagram of the third practical application step of the present invention. Figure 9 is a schematic diagram of an auxiliary lock on the movable bolt. Figure 10 is a schematic diagram of the present invention provided with a labor-saving spring. Figure 11 is a schematic diagram of the movement of the movable bolt provided with a labor-saving spring of the present invention.

1:鎖體 1: Lock body

11:第一鎖體部 11: First lock body

111:密碼鎖件 111: Password lock

12:第二鎖體部 12: Second lock body

2:活動栓 2: Active bolt

22:栓部 22: Bolt

4:栓扣 4: Buckle

41:安裝部 41: Installation Department

42:延伸部 42: Extension

421:鎖洞 421: Lock hole

Claims (8)

一種門栓鎖具組,其包括: 一鎖體,其包括有相互樞設的一第一鎖體部、一第二鎖體部,該第一鎖體部設置有一密碼鎖件、一定位插件,該第二鎖體部設置有一鎖扣、一軌道件、一活動栓,該活動栓滑設於該軌道件,該活動栓具有一定位孔,該第一鎖體部扣合於該第二鎖體部時,該鎖扣對應該密碼鎖件,該定位插件插設於該定位孔,該活動栓無法滑動; 及一栓扣,其包括有相連之一安裝部、一延伸部,該延伸部具有一鎖洞,該鎖洞供該活動栓活動穿設。 A bolt lock set includes: A lock body, which includes a first lock body part and a second lock body part pivoted with each other, the first lock body part is provided with a combination lock and a positioning plug, the second lock body part is provided with a lock buckle, a track member, and a movable bolt, the movable bolt is slidably arranged on the track member, the movable bolt has a positioning hole, when the first lock body part is buckled with the second lock body part, the lock buckle corresponds to the combination lock, the positioning plug is inserted into the positioning hole, and the movable bolt cannot slide; And a bolt buckle, which includes a connected mounting part and an extension part, the extension part has a lock hole, and the lock hole is used for the movable bolt to be movably inserted. 如請求項1所述之門栓鎖具組,其中該第一鎖體部扣合於該第二鎖體部時,該第一鎖體部與該第二鎖體部形成一容置空間。A bolt lock set as described in claim 1, wherein when the first lock body is buckled with the second lock body, the first lock body and the second lock body form a accommodating space. 如請求項1所述之門栓鎖具組,進一步包括有一輔助鎖具,該輔助鎖具活動鎖於該活動栓,該輔助鎖具鎖於該活動栓時,該活動栓滑移幅度受限。The door bolt lock set as described in claim 1 further includes an auxiliary lock, which is movably locked to the movable bolt. When the auxiliary lock is locked to the movable bolt, the sliding range of the movable bolt is limited. 如請求項1所述之門栓鎖具組,其中該第二鎖體部與該活動栓之間設置有一省力彈簧。A door bolt lock set as described in claim 1, wherein a force-saving spring is arranged between the second lock body and the movable bolt. 如請求項4所述之門栓鎖具組,其中該省力彈簧呈現扭力彈簧的樣態,該省力彈簧包括有一短臂段、一長臂段,該短臂段與該長臂段之間相連有一扭轉段,該短臂段與該第二鎖體部相連,該長臂段與該活動栓相連。A door bolt lock set as described in claim 4, wherein the effort-saving spring is in the form of a torsion spring, and the effort-saving spring includes a short arm section and a long arm section, a torsion section is connected between the short arm section and the long arm section, the short arm section is connected to the second lock body, and the long arm section is connected to the movable bolt. 如請求項1所述之門栓鎖具組,其中該軌道件包括有一件體段,該件體段相連於該第二鎖體部,該件體段二端分別相連有一D環部,該活動栓滑設於各D環部。A door bolt lock set as described in claim 1, wherein the track member includes a body segment, the body segment is connected to the second lock body, and the two ends of the body segment are respectively connected to a D-ring portion, and the movable bolt is slidably disposed on each D-ring portion. 如請求項6所述之門栓鎖具組,其中該活動栓具有一限位部,該限位部位各D環部之間。A door bolt lock set as described in claim 6, wherein the movable bolt has a limiting portion, and the limiting portion is between each D-ring portion. 如請求項1所述之門栓鎖具組,其中該活動栓包括有相連之一扳動部、一栓部,該栓部與扳動部呈板狀且彼此之間夾有小於180度之一夾角,該栓部滑設於該軌道件。A door bolt lock set as described in claim 1, wherein the movable bolt includes a pull portion and a bolt portion connected to each other, the bolt portion and the pull portion are plate-shaped and have an angle less than 180 degrees between them, and the bolt portion is slidably disposed on the track member.
TW111148783A 2022-12-19 2022-12-19 Door bolt lockset TWI806807B (en)

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Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW509263U (en) * 2001-11-06 2002-11-01 Jin-Chang Huang Improved structure for door bolt
US7107800B2 (en) * 2002-11-22 2006-09-19 Hong Yao Chen Door bolt
TWM313710U (en) * 2006-12-28 2007-06-11 Ya Fong Hardware Co Ltd Structure of door bolt
TWM420577U (en) * 2011-06-17 2012-01-11 Univ Chia Nan Pharm & Sciency Latch structure
TWM481972U (en) * 2014-03-13 2014-07-11 Qing-Fu Zheng Foot pedal type door latch
TWM564627U (en) * 2018-05-10 2018-08-01 劉世宗 Door bolt improved structure

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