This application claims priority of Taiwanese Application No. 103204045, filed on Mar. 10, 2014.
The disclosure relates to an electric nail gun, and more particularly to an electric nail gun including a restoring mechanism.
Referring to
The impact member 15 is movable in response to the pivot movement of the swing arm 14 relative to the main body 10 to contact the flywheel 12, and is thereby driven by the flywheel 12 to move along an axis (A) toward the nail path 11 against the biasing action of the resilient members 16, so as to drive the nail striking blade 17 to move within the nail path to perform a nail-striking operation. Afterward, the impact member 15 is drawn by the resilient members 16 to move back to its original position.
In the conventional electric nail gun 1, the length of the linear deformation of the resilient members 16 along the axis (A) is equal to the travel distance of the impact member 15 during the nail-striking operation, so that each of the resilient members 16 has a relatively great extended length, and may fatigue easily and therefore have a short service life.
Therefore, an object of the disclosure is to provide an electric nail gun that can overcome the aforesaid drawback associated with the prior art.
According to the disclosure, the electric nail gun includes a main frame, a flywheel, a swing arm, an impact member and a restoring mechanism. The flywheel is mounted rotatably to the main frame and driven by electric power. The swing arm is pivoted to the main frame. The impact member is mounted movably to the swing arm. The swing arm is pivotable relative to the main frame to move the impact member to contact the flywheel so that the impact member is driven by the flywheel to move in a direction of an axis from a normal position where the impact member is proximate to a rear end of the main frame, to a striking position where the impact member is distal from the rear end of the main frame. The restoring mechanism includes at least one sliding member, at least one first resilient member and a second resilient member. The sliding member is mounted to the impact member and movable relative to the impact member in the direction of the axis between a released position and a tensed position. The tensed position is closer to a rear end of the impact member than the released position. The sliding member is at the released position when the impact member is at the normal position. The first resilient member has opposite ends that are connected respectively to a rear end of the swing arm and the sliding member such that, when the impact member is moved from the normal position to the striking position, the sliding member is drawn to move relative to the impact member from the released position to the tensed position by the first resilient member, and the length of the linear deformation of the first resilient member in the direction of the axis is smaller than the travel distance of the impact member from the normal position to the striking position. The second resilient member has opposite ends that are connected respectively to the impact member and the sliding member for biasing the sliding member to the released position when the impact member is at the normal position.
Other features and advantages of the disclosure will become apparent in the following detailed description of the embodiment with reference to the accompanying drawings, of which:
Referring to
The swing arm 23 is pivotable to move the impact member 25 to contact the flywheel 22 so that the impact member 25 is driven by the flywheel 22 to move in the direction of the axis (X) from the normal position to the striking position. The swing arm 23 has two rear hook portions 231 that are connected integrally to a rear end of the swing arm 23, and that are spaced apart from each other in a direction transverse to the direction of the axis (X).
The impact member 25 has first and second stop portions 251, 252 that are spaced apart from each other in the direction of the axis (X). The first stop portion 251 is closer to a rear end 253 of the impact member 25 than the second stop portion 252.
The embodiment of this disclosure further includes a restoring mechanism that includes a guide member 3, a sliding member 4, two first resilient members 5 and a second resilient member 6.
The guide member 3 is configured as a rod that is mounted fixedly to the impact member 25, and that extends in the direction of the axis (X) through the first and second stop portions 251, 252 of the impact member 25.
The sliding member 4 has a central portion that is disposed between the first and second stop portions 251, 252 and that is formed with a through hole 41 for extension of the guide member 3 therethrough, so that the sliding member 4 is movable relative to the impact member 25 in the direction of the axis (X) between a released position (see
Each of the first resilient members 5 is configured as a rubber ring, and has opposite ends that are hooked respectively on a respective one of the rear hook portions 231 and a corresponding one of the front hook portions 42.
The second resilient member 6 is configured as a compression spring that is sleeved on the guide member 3, and that has opposite ends connected respectively to the first stop portion 251 of the impact member 25 and the sliding member 4 for biasing the sliding member 4 to the released position when the impact member 25 is at the normal position.
Referring to
Referring back to
It is noted that the second resilient member 6 may be configured as an extension spring that has opposite ends connected respectively to the second stop portion 252 of the impact member 25 and the sliding member 4 for biasing the sliding member 4 to the released position when the impact member 25 is at the normal position.
The advantages of this disclosure are as follows:
1. Since the sliding member 4 is drawn by the first resilient members 5 to move to the tensed position when the impact member 25 is moved to the striking position, each of the first resilient members 5 has a relatively small extended length compared with the resilient members 16 (see
2. The sliding member 4 and the second resilient member 6 are mounted on the impact member 25, and are configured not to occupy an additional space of the main frame 21. The second resilient member 6 biases the sliding member 4 to the released position when the impact member 25 is at the normal position.
While the disclosure has been described in connection with what is considered the exemplary embodiment, it is understood that this disclosure is not limited to the disclosed embodiment 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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103204045 | Mar 2014 | TW | national |