1. Field of the Invention
The present invention relates to a flat clamping hand tool structure, in particular to a flat clamping hand tool structure which provides a steady linear clamping motion with respect to a work piece by operating left and right arms so as to get work quality and enhance its function.
2. Description of the Prior Art
Canvas is provided with holes and rivets. If the demand for the holes and rivets is large, it will be performed with a processing machine, such as a perforating machine or a riveting machine, at the manufacture factor. If the demand for the holes and rivets is small, it will be performed with a hand tool, such as a hand clamp device. Taiwanese Patent Number M248586 disclosed a hand clamp device with a poka-yoke mechanism.
The canvas is placed on a work table of the perforating machine, the riveting machine, or the hand clamp to be perforated or riveted by a tubular blade or a rivet post in a vertical direction. Because the tubular blade is perpendicular to the canvas, the canvas can be perforated smoothly. The rivet post is also perpendicular to a rivet holder for compressing male and female rivet members to form a rivet buckle, so that the canvas and the rivet buckle can be fastened firmly, without deformation.
However, the processing machine and the hand clamp device are not portable and disadvantageous for on-the-spot perforation and riveting. Taiwanese Patent Number M314103, entitled “Improved Hand Tool Structure”, which is portable. The user can operate it by hands so that the canvas can be perforated or riveted with ease. The conventional clamp comprises a main arm and a second arm which are pivotally connected. The jaws of the clamp are rotated in a sector motion, not a linear motion. For a thick canvas, the blades contact the surfaces of the canvas asynchronously, which may result in incomplete or uneven perforations. Sometimes, the clamp cannot be operated smoothly. Similarly, when the canvas is riveted with rivet buckles, the working member (rivet post) does not compress the rivet totally. The rivet buckles may not be riveted tightly or fixed to the canvas firmly. Even the rivet buckles may be deformed. Thus, a need for improvement still exists.
The primary object of the present invention is to provide a flat clamping hand tool structure comprising a left arm and a right arm; an inner edge of one end of the left arm being pivotally connected with an inner edge of one end of the right arm through a first pivot member, an outer edge of the end of the left arm being pivotally connected with a first end of a left swing plate through a second pivot member, an outer edge of the end of the right arm being pivotally connected with a first end of a right swing plate through a third pivot member; the left swing plate having a left limit portion protruding from a middle portion thereof, the right swing plate having a right limit portion protruding from a middle portion thereof, the left limit portion being provided with first teeth and the right limit portion being provided with second teeth for meshing with each other, the left limit portion and the right limit portion being pivotally connected with a U-shaped upper holder and a U-shaped lower holder through a fourth pivot member and a fifth pivot member, respectively; the upper holder having a pair of first holder bits which are parallel, the lower holder having a pair of second holder bits which are parallel, the first and second holder bits being provided with guiding blocks which are aligned each other; a second end of the left swing plate being pivotally connected with a U-shaped left clamping seat through a first fixing member, a second end of the right swing plate being pivotally connected with a U-shaped right clamping seat through a second fixing member; the left clamping seat having upper and lower surfaces each formed with a left mounting slot for the first fixing member to be inserted therein, the right clamping seat having upper and lower surfaces each formed with a right mounting slot for the second fixing member to be inserted therein, inside the left and right clamping seats being formed with guiding grooves corresponding to the guiding blocks of the upper and lower holders, the left clamping seat having one side provided with a left fixing portion which faces a right fixing portion provided on one side of the right clamping seat; the left and right fixing portions are coupled with working members, respectively; the first and second fixing members being moved up and down in the left and right mounting slots of the left and right clamping seats by the left and right swing plates which are pivotally connected with the upper and lower holders, the left and right clamping seats being guided to move by the guiding blocks of the upper and lower holders to slide along the guiding grooves of the left and right clamping seats, the left arm and the right arm being pivoted together through the first pivot member, with the second and third pivot members to link the left and right swing plates, the left and right limit portions of the left and right swing plates meshing with each other such that the left and right clamping seats are driven to move levelly for a clamp motion by the guiding blocks of the upper and lower holders to slide along the guiding grooves of the left and right clamping seats synchronously. The working members provide do a linear clamping motion with respect to a work piece by operation of the left and right arms. The present invention can be operated smoothly so as to get better work quality.
A further object of the present invention is to provide a flat clamping hand tool structure, wherein the left and right clamping seats are provided with the left and right fixing portions which correspond to each other. The left and light fixing portions are coupled with the working members. The left and right fixing portions of the left and right clamping seats are threaded bolts. The working members are formed with threaded holes, so that the working members can be screwed to the fixing portions. The working members mounted on the left and right clamping seats can be replaced with other working members in different types.
Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.
Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings.
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The left swing plate 20 has a left limit portion 200 protruding from a middle portion thereof. The right swing plate 21 has a right limit portion 210 protruding from a middle portion thereof. The left limit portion 200 is provided with first teeth 201 and the right limit portion 210 is provided with second teeth 211 for meshing with each other. The left limit portion 200 and the right limit portion 210 are pivotally connected with a U-shaped upper holder 30 and a U-shaped lower holder 31 through a fourth pivot member 22 and a fifth pivot member 23, respectively.
The upper holder 30 has a pair of first holder bits 300 which are parallel. The lower holder 31 has a pair of second holder bits 310 which are parallel. The first and second holder bits 300, 310 are provided with guiding blocks 301, 311 which are aligned each other. A second end of the left swing plate 20 is pivotally connected with a U-shaped left clamping seat 40 through a first fixing member 24. A second end of the right swing plate 21 is pivotally connected with a U-shaped right clamping seat 41 through a second fixing member 25. The left clamping seat 40 has upper and lower surfaces each formed with a left mounting slot 400 for the first fixing member 24 to be inserted therein. The right clamping seat 41 has upper and lower surfaces each formed with a right mounting slot 410 for the second fixing member 25 to be inserted therein. Inside the left clamping seat 40 and right clamping seat 41 are formed with guiding grooves 401, 411 corresponding to the guiding blocks 301, 311 of the upper holder 30 and the lower holder 31. The left clamping seat 40 has one side provided with a left fixing portion 402 which faces a right fixing portion 412 provided on one side of the right clamping seat 41. The left and right fixing portions 402, 412 are coupled with working members 50, 51, respectively. The first and second fixing members 24, 25 can be moved up and down in the left and right mounting slots 400, 410 of the left and right clamping seats 40, 41 by the left and right swing plates 20, 21 which are pivotally connected with the upper and lower holders 30, 31. The left and right clamping seats 40, 41 are guided to move by the guiding blocks 301, 311 of the upper and lower holders 30, 31 to slide along the guiding grooves 401, 411 of the left and right clamping seats 40, 41.
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Although the invention has been explained in relation to its preferred embodiment, it is to be understood that many other possible modifications and variations can be made without departing from the spirit and scope of the invention as hereinafter claimed.
Number | Name | Date | Kind |
---|---|---|---|
1586297 | Du Bois | May 1926 | A |
1832879 | Ruskin | Nov 1931 | A |
2590792 | Reneer | Mar 1952 | A |
4219919 | Fischbein et al. | Sep 1980 | A |
4235073 | Tracy | Nov 1980 | A |
4365411 | Muldoon, Jr. | Dec 1982 | A |
4769891 | Corral | Sep 1988 | A |
5016503 | Morton | May 1991 | A |
5121624 | Haughian | Jun 1992 | A |
5165155 | Adams | Nov 1992 | A |
6412375 | Wang et al. | Jul 2002 | B1 |
6715193 | Wynn, Jr. | Apr 2004 | B1 |
7189234 | Zucherman et al. | Mar 2007 | B2 |
Number | Date | Country | |
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20110138973 A1 | Jun 2011 | US |