Two-stage striker pin lifting structure of pneumatic tool

Abstract

Disclosed in the present utility model is a two-stage striker-pin lifting structure of a pneumatic tool. The two-stage striker-pin lifting structure comprises: a pneumatic tool body, wherein a striker pin and a driving mechanism for driving the striker pin to lift are provided inside the pneumatic tool body; a tail end of the striker pin is assembled in a gas storage chamber; the driving mechanism comprises a driving wheel connected to a driving device; a first driving portion and a second driving portion are provided on the driving wheel; a first cooperating portion and a second cooperating portion are respectively correspondingly provided on two sides of the striker pin; the first driving portion cooperates with the first cooperating portion by means of a transition member; the second driving portion cooperates with the second cooperating portion; and as the driving wheel rotates, the first driving portion correspondingly cooperates with the first cooperating portion, and subsequently the second driving portion correspondingly cooperates with the second cooperating portion. The advantages of the two-stage striker-pin lifting structure are: the structure is rational and compact, and by means of the design of the two-stage lifting structure, the lifting distance of the striker pin is increased, thereby enhancing a striking force during the firing of the striker pin.

Description

5 The present invention relates to the technical field of pneumatic tool manufacturing, and in particular to a firing pin two-stage lifting structure for a pneumatic tool. Background Art 10 Pneumatic tools are tools that use air pressure as a power source, such as pneumatic nail guns. The pneumatic nail gun uses air pressure in an air reservoir to strike a firing pin, realizing nail firing by the striking of the firing pin on a nail. The Patent Application No. CN202020898461.6 and entitled “PNEUMATIC NAIL GUN” discloses a pneumatic nail gun, which includes a shell, a motor, a first 15 air cylinder, a second air cylinder, a nail feeding assembly, a trigger, a first piston, and a second piston. The motor drives a gear to drive a rack such that the first piston reciprocates in the first air cylinder, the second air cylinder is in the first air cylinder, the first air cylinder and the second air cylinder share a front end cap and a tail end cap, the second piston is provided with a counterweight block and a shock-absorbing 20 ring, a latch assembly is mounted on an inner side of the tail end cap to lock the second piston, and the first piston is provided with a release ejector pin used for releasing the latch assembly. The firing pin is connected to the pistons. Under the same cylinder conditions, the greater the distance by which the firing pin is lifted, the greater the firing force that can be generated, and the stronger the penetration 25 force of the nail gun after firing. Therefore, in order to improve the penetration force of the nail gun, the firing pin lifting structure of the pneumatic nail gun needs to be further improved. Summary 30 An objective of the present invention is to disclose, to the society, a firing pin two-stage lifting structure for a pneumatic tool that is rational and compact and capable of increasing the distance by which a firing pin is lifted, in order to make up for deficiencies mentioned above. Hie technical solution of the present invention is implemented as follows: A firing pin two-stage lifting structure for a pneumatic tool includes a pneumatic tool body, a firing pin and a driving mechanism for driving the firing pin to be lifted are disposed in the pneumatic tool body, a tail end of the firing pin is fitted m an air storage chamber, the driving mechanism includes a driving wheel connected to a driving device, the driving wheel is provided with a first driving part and second driving parts, a first engaging part and a second engaging part are respectively provided on two sides of the firing pin correspondingly, the first driving part is engaged with the first engaging part via a transition member, and the second driving parts are engaged with the second engaging part; and as the driving wheel rotates, tire first driving part and the second driving parts are sequentially engaged with the first engaging part and the second engaging part correspondingly. Measures to further optimize the technical solution are as follows: As an improvement, the first driving part is a driving block, the first engaging part is a bump disposed on one side of the firing pin, and the transition member is disposed across the firing pin. The driving block acts on die transition member and then the transition member acts on the bump of the firing pin, thereby completing a first-stage lifting. As an improvement, the transition member is provided with an acting part that extends into a moving trajectory of the first driving part, and the transition member is further provided with an abutting part that is in abutting fit with the first engaging part. The acting part is engaged with the first driving part such that the transition member realizes force transmission. The abutting part acts on the first engaging part such that the force is transmitted to the firing pin. As an improvement, the second driving parts are a plurality of driving posts spaced apart from each other, the driving posts are distributed in a circular arc, and the second engaging part is a rack disposed on the other side of the firing pin. The driving posts act one by one on corresponding teeth of the rack to complete a second-stage lifting. As an improvement, a distance from the first driving part to a center of rotation of the driving wheel is greater than a distance from the second driving parts to the center of rotation of the driving wheel. Since the force needed for the second-stage lifting of the firing pin is greater than the force needed for the first-stage lifting, a rotation radius of the second driving parts is smaller than a rotation radius of the first driving part, enabling a better lifting of the firing pin. As an improvement, the driving wheel is provided with an extension that extends outwards radially, and the first driving part is disposed on the extension. As an improvement, a guide chute is provided in the pneumatic tool body, and the transition member is slidably disposed in the guide chute. The guide chute acts as a guide, allowing the transition member to slide more smoothly. As an improvement, the driving device is a motor. Compared with the prior art, the present invention has the following advantages: The firing pin two-stage lifting structure for a pneumatic tool according to the present invention has a rational structure. Since the first engaging part and the second engaging part are respectively provided on two sides of the firing pin correspondingly, and the first driving part and the second driving parts are correspondingly provided on the driving wheel, the structure is compact. As the driving wheel rotates, the first driving part acts on the first engaging part to realize a first-stage lifting, and then the second driving parts act on the second engaging part to realize a second-stage lifting. With the design of the two-stage lifting structure, it increases the distance by which the firing pin is lifted, thereby increasing a striking force during firing of the firing pin. Brief Description of the Drawings Fig. 1 is a perspective structural diagram of an embodiment of the present invention; Fig. 2 is an enlarged view of part A in Fig. 1; Fig. 3 is a perspective structural diagram of an embodiment of the present invention from another perspective; Fig. 4 is an enlarged view of part B in Fig. 3; Fig. 5 is a perspective structural diagram of a firing pin according to an embodiment of the present invention; and Fig. 6 is a perspective structural diagram of a transition member according to an embodiment of the present invention. List of reference signs in the figures of the present invention: pneumatic tool body 1, guide chute 11, firing pin 2, first engaging part 21, second engaging part 22, air storage chamber 3, driving device 4, driving wheel 5, first driving part 51, second driving part 52, extension 53, transition member 6, acting part 61, abutting part 62. Detailed Description of Embodiments The present invention will be described in further detail below with reference to the accompanying drawings. The following description is for purposes of disclosing the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are by way of example only, and other obvious variations are conceivable to those skilled in the art. The basic principles of the present invention defined in the following description may be used in other embodiments, variations, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention. It should be understood by those skilled in the art that orientations or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the accompanying drawings and are only for facilitating the simplified description of the present invention, rather than indicating or implying that an apparatus or an element referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore the terms will not be interpreted as limiting the present invention. It can be understood that the term "a" is to be understood as "at least one" or "one or more", i.e., in an embodiment, the number of elements may be one, and in other embodiments, the number of the elements may be multiple, the term "a" shall not be understood as a limitation on the number. As shown in Figs. 1 to 6, a firing pin two-stage lifting structure for a pneumatic tool includes a pneumatic tool body 1, a firing pin 2 and a driving mechanism for driving the firing pin to be lifted are disposed in the pneumatic tool body 1, a tail end of the firing pin 2 is fitted in an air storage chamber 3, the driving mechanism includes a driving wheel 5 connected to a driving device 4, the driving wheel 5 is provided with a first driving part 51 and second driving parts 52, a first engaging part 21 and a second engaging part 22 are respectively provided on two sides of the firing pin 2 correspondingly, the first driving part 51 is engaged with the first engaging part 21 via a transition member 6, and the second driving parts 52 are engaged with the second engaging part 22; and as the driving wheel 5 rotates, the first driving part 51 and the second driving parts 52 are sequentially engaged with the first engaging part 21 and the second engaging part 22 correspondingly. The above driving device 4 is preferably a motor, and a housing (not shown in the figures) is provided outside the pneumatic tool body 1. The first driving part 51 is a driving block, the first engaging part 21 is a bump disposed on one side of the firing pin 2, and the transition member 6 is disposed across the firing pin 2. The driving block acts on the transition member 6 and then the transition member 6 acts on the bump of the firing pin 2, thereby completing a first-stage lifting. The transition member 6 is provided with an acting part 61 that extends into a moving trajectory of the first driving part 51, and the transition member 6 is further provided with an abutting part 62 that is in abutting fit with the first engaging part 21. Hie second driving parts 52 are a plurality of driving posts spaced apart from each other, the driving posts are distributed in a circular arc, and the second engaging part 22 is a rack disposed on the other side of the firing pin 2. The driving posts act one by one on corresponding teeth of the rack to complete a second-stage lifting. Since a piston at a rear end of the firing pin 2 compresses air in the air storage chamber 3 during lifting, the internal pressure of the air storage chamber 3 gradually increases as the firing pin 2 is lifted. Therefore, as it increases the distance by which the firing pin is lifted, the force needed for lifting also increases. Herein, a distance from the first driving part 51 to a center of rotation of the driving wheel 5 is greater than a distance from the second driving parts 52 to the center of rotation of the driving wheel 5. That is, a rotation radius of the first driving part 51 is greater than the rotation radius of the second driving parts 52, and in the case of the same motor power, the smaller the rotation radius, the greater the driving force. The driving wheel 5 is provided with an extension 53 that extends outwards radially, and the first driving part 51 is disposed on the extension 53. With the arrangement of the extension 53, it is possible to expand the space outwards radially to provide a location for arranging the first driving part 51 while tire main structure of the driving wheel 5 keeps unchanged. A guide chute 11 is provided in the pneumatic tool body 1, and the transition member 6 is slidably disposed in the guide chute 11. The arrangement of the guide chute 11 provides a guide for the sliding of the transition member 6 in the pneumatic tool body 1, making it slide more smoothly. Operation principle: According to the firing pin two-stage lifting structure of the present invention, the first engaging part 21 and the second engaging part 22 are respectively provided on two sides of the firing pin 2 correspondingly, and the first driving part 51 and the second driving parts 52 are provided on the driving wheel 5; and since the driving wheel 5 is disposed on one side of the firing pin 2, the transition member 6 is provided to enable force transmission between the first driving part 51 and the first engaging part 21 on the opposite side of the firing pin. When the firing pin 2 is lifted, the driving wheel 5 is driven to rotate by the driving device 4 (motor); and as the driving wheel 5 rotates, the driving block on the driving wheel 5 (i.e., the first driving part 51) acts on die acting part 61 of the transition member 6, and the abutting part 62 of the transition member 6 transmits a force to the bump of the firing pin 2 (i.e., the first engaging part 21), thereby realizing the engagement between the first driving part 51 and the first engaging part 21 to complete a first-stage lifting. After the first-stage lifting, the driving wheel 5 continues to rotate, and the driving posts (i.e., the second driving parts 52) on the driving wheel 5 act one by one on corresponding teeth of the rack of the firing pin 2 to complete a second-stage lifting. The firing pin two-stage lifting structure of the present invention is rational and compact. With the design of the second-stage lifting structure, it increases the distance by which the firing pin 2 is lifted, which can increase a striking force during firing of the firing pin 2. The description above merely relates to preferred embodiments of the present invention, and is not intended to limit the implementations and the scope of protection of the present invention. It should be appreciated by those skilled in the art that solutions obtained from equivalent substitutions and obvious variations made using the description and the drawings of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A firing pin two-stage lifting structure for a pneumatic tool, comprising a pneumatic tool body (1), a firing pin (2) and a driving mechanism for driving the firing pin to be lifted being disposed in the pneumatic tool body (1), and a tail end of the firing pin (2) being fitted in an air storage chamber (3), characterized in that the driving mechanism comprises a driving wheel (5) connected to a driving device (4), the driving wheel (5) is provided with a first driving part (51) and second driving parts (52), a first engaging part (21) and a second engaging part (22) are respectively provided on two sides of the firing pm (2) correspondingly, the first driving part (51) is engaged with the first engaging part (21) via a transition member (6), and the second driving parts (52) are engaged with the second engaging part (22); and as the driving wheel (5) rotates, the first driving part (51) and the second driving parts (52) are sequentially engaged with the first engaging part (21) and the second engaging part (22) correspondingly.

2. The firing pin two-stage lifting structure for a pneumatic tool according to claim 1, characterized in that the first driving part (51) is a driving block, the first engaging part (21) is a bump disposed on one side of the firing pin (2), and the transition member (6) is disposed across the firing pin (2).

3. The firing pin two-stage lifting structure for a pneumatic tool according to claim 2, characterized in that the transition member (6) is provided with an acting part (61) that extends into a moving trajectory of the first driving part (51), and the transition member (6) is further provided with an abutting part (62) that is in abutting fit with the first engaging part (21).

4. The firing pin two-stage lifting structure for a pneumatic tool according to claim 3, characterized in that the second driving parts (52) are a plurality of driving posts spaced apart from each other, the driving posts are distributed in a circular arc, and the second engaging part (22) is a rack disposed on the other side of the firing pin (2).

5. The firing pin two-stage lifting structure for a pneumatic tool according to claim 4, characterized in that a distance from the first driving part (51) to a center of rotation of the driving wheel (5) is greater than a distance from the second driving parts (52) to the center of rotation of the driving wheel (5).

56. The firing pin two-stage lifting structure for a pneumatic tool according to claim 5, characterized in that the driving wheel (5) is provided with an extension (53) that extends outwards radially, and the first driving part (51) is disposed on the extension (53).

107. The firing pin two-stage lifting structure for a pneumatic tool according to claim 6, characterized in that a guide chute (11) is provided in the pneumatic tool body (1), and the transition member (6) is slidably disposed in the guide chute (11).15 8. The firing pin two-stage lifting structure for a pneumatic tool accordingto claim 7, characterized in that the driving device (4) is a motor.PCT / CN2024 / 136082A. CLASSIFICATION OF SUBJECT MATTERB25Cl / 04(2006.01)iAccording to International Patent Classification (IPC) or to both national classification and IPCB. FIELDS SEARCHEDMinimum documentation searched (classification system followed by classification symbols) IPC:B25C,B25FDocumentation searched other than minimum documentation to the extent that such documents are included in the fields searchedElectronic data base consulted during the international search (name of data base and, where practicable, search terms used)CNTXT; ENTXTC; CNKI: fifiXI:, X^XM, X^XM, XsAXM, ?TXXM, 8, <XM Ot, W, Btb, BE, fl iWj, itX fiXS, fiififi, W, X1X xs, VEN; ENTXT: hammer, power tool, electric tool, pneumatic tool, impact, cylinder, firing pin, lift, stroke, extend, alligator, gear.DOCUMENTS CONSIDERED TO BE RELEVANTCategory* Citation of document, with indication, where appropriate, of the relevant passages Relevant to claim No. PX CN 221048344 U (REN FENG) 31 May 2024 (2024-05-31) description, paragraphs 29-40, and figures 1-6 1-8 X CN 110385675 A (NANJING TOUA HARDWARE &TOOLS CO., LTD.) 29 October 2019 (2019-10-29) description, paragraphs 50-57, and figures 11-17 1-8 v A. CN 110253503 A (NANJING TOUA HARDWARE &TOOLS CO., LTD.) 20 September 2019 (2019-09-20) description, paragraphs 18-22, and figures 1-5 1-8 A WO 2017056810 Al (HITACHI KOKI KK) 06 April 2017 (2017-04-06) entire document 1-8| | Further documents are listed in the continuation of Box C. | J | See patent family annex.* Special categories of cited documents: “T” later document published after the international filing date or priority “A” document defining the general state of the art which is not considered date and not in conflict with the application but cited to understand the to be of particular- relevance principle or theory underlying the invention “D” document cited by the applicant in the international application “X” document of particular- relevance; the claimed invention cannot be “E” earlier application orpatent but published on or after the international considered novel or cannot be considered to involve an inventive step filing date when the document is taken alone “L” document which may throw doubts on priority claim(s) or which is “Y” document of particular relevance; the claimed invention cannot be cited to establish the publication date of another citation or other considered to involve an inventive step when the document is special reason (as specified) combined with one or more other such documents, such combination “O” document referring to an oral disclosure, use, exhibition or other being obvious to a person skilled in the art means document member of the same patent family “P” document published prior to the international filing date but later than the priority date claimed Date of the actual completion of the international search 24 December 2024 Date of mailing of the international search report 22 February 2025 Name and mailing address of the ISA / CN China National Intellectual Property Administration (ISA / CN) China No. 6, Xitucheng Road, Jimenqiao, Haidian District, Beijing 100088 Authorized officer Telephone No.INTERNATIONAL SEARCH REPORT Information on patent family membersInternational application No.PCT / CN2024 / 136082Patent document cited in search report Publication date (day / month / year) Patent family member, s) Publication date (day / month / year) CN 221048344 U 31 May 2024 None CN 110385675 A 29 October 2019 WO 2021003972 Al 14 January 2021 CN 110385675 B 08 March 2022 CN 110253503 A 20 September 2019 JP 2022535984 A 10 August 2022 JP 7366158 B2 20 October 2023 WO 2020248531 Al 17 December 2020 EP 3984703 Al 20 April 2022 CN 110253503 B 22 March 2022 RU 2775020 Cl 27 June 2022 WO 2017056810 Al 06 April 2017 None

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