TW201738041A - Power transfer pliers - Google Patents

Abstract

A hinged handheld tool that includes an integrated power transmission mechanism to allow a user to increase an output pressure onto an external object. The handheld tool includes a first tool-part assembly and a second tool-part assembly, wherein each includes a hand lever, a jaw-receiving cavity, an independent jaw, and a cam. The independent jaw engages the external object and comprises an engagement end and a tapered end. The hand lever is the grasping element for the user. The hand lever of the first tool-part assembly and the second tool-part assembly are terminally and pivotably connected to each other about a fulcrum axis. The independent jaw is pivotably connected to the hand lever within the jaw-receiving cavity. The cam is rotatably mounted within the jaw-receiving cavity, in between the hand lever and the tapered end. The cam and the tapered end are mechanically coupled to yield a ratchet-type mechanism.

Description

Labor saving forceps

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a hand-held cutting, bending, or gripping tool, and more particularly to an articulated hand tool, such as a pair of jaws having a force transmission mechanism that allows for a lower clamping force input by a user. Increase the output power for larger tools.

There are a number of tools for applying the force of the cut to an area of the object to divide the object into segments under controlled conditions. These tools include general clamps, thread cutters, scissors, trimming knives, and more. This type of tool allows the user to accurately apply large forces to small areas to create extreme pressure with a cutting effect. Such precise and powerful cutting tools make metalworking, manufacturing, gardening and the like easier.

However, such devices often fail to meet the needs of users. Sometimes you will encounter external objects that require a lot of force to cut. In such a situation, the force directly transferring the user's grip is generally insufficient to overcome the strength of the outer article against cutting. For example, large metal wires and metal bars cannot be handled with standard clamps or cutters. There is therefore a need for a clamp that amplifies the user's output as an enlarged tool output, allowing greater force to be applied to specific areas of the external object.

The present invention is for dealing with the above problems. The present invention is a hand held clamp that increases the pressure of the handle by an improved force transmission mechanism to increase the force transmitted to the blade. The present invention uses a set of inner cams to convert the pressure applied to the handle to the pressure applied to the cutting edge. This design allows the output force to be proportional to the curvature of the cam surface for the inner handle.

The labor-saving forceps of the present invention comprises: a first tool portion and a second tool portion. The first tool part and the second tool part respectively include: a handle, a clamping head groove, an independent clamping head, a holding spring, and a cam. The handle of the first tool portion and the handle of the second tool portion are pivotally connected at their ends by a shaft. The clamp groove includes: a first groove area and a second groove area. The first trough area is located at the end of the handle and adjacent to the fulcrum. The first trough area houses the body of the independent jaw. The independent clamp head includes: a clamping end and a tapered end. The clamping end contacts the external object and applies pressure to the external object. The tapered end is mechanically coupled to the handle via a cam to amplify the clamping force from the handle. The retaining spring is stretchably coupled to the tapered end and the handle to extendably attach the independent jaw to the handle. The cam is rotatably mounted within the jaw groove as a jaw-like component that provides a ratchet function for increased overall leverage.

1‧‧‧First Tools Department

2‧‧‧Second Tools Division

3‧‧‧handle

4‧‧‧ inner handle

5‧‧‧Outer handle

6‧‧‧Clamp head slot

7‧‧‧First trough area

8‧‧‧Second trough area

9‧‧‧Independent clamp head

10‧‧‧Clamping end

11‧‧‧

12‧‧‧Bent side

13‧‧‧ cam

14‧‧‧Rotary axis

15‧‧‧Free end

16‧‧‧ fixed end

17‧‧‧ side

18‧‧‧ fulcrum

19‧‧‧ pivot pin

20‧‧‧ Keep the spring

21‧‧‧ cutting edge

Figure 1 is a perspective view of the present invention.

Figure 2 is an exploded view of the present invention.

Figure 3 is a cross-sectional view of the present invention.

Figure 4 is a cross-sectional view of the first tool portion of the present invention.

It is to be understood that the illustrations of the invention are intended to be illustrative of the invention and are not intended to limit the scope of the invention.

The present invention discloses an articulated hand tool, such as a pair of jaws, having a force transmission mechanism that increases the lower clamping force input by the user to a greater tool output force. The invention can be combined with a variety of hand tools, such as conventional clamps, thread cutters, cable cutters, pruning shears, and the like, although the invention is not limited to the applications described above.

Referring to Figure 1, the present invention includes a first tool portion 1 and a second tool portion 2, the first tool portion 1 and the second tool portion 2 forming one half of the present invention, respectively. The first tool portion 1 and the second tool portion 2 respectively include a handle 3, a clamp head slot 6, an independent clamp head 9, a retaining spring 20, and a cam 13. The handle 3 is used as a component for the user to hold and provides the user with the mechanical advantage of amplifying the clamping force generated by the user. The handle 3 includes an inner shank 4 and an outer shank 5 for the user to hold. The shape, length, width, and material of the handle 3 can vary depending on the needs and preferences of the user. For example, the length of the handle 3 can directly affect the clamping/compression forces produced by the present invention. As shown in FIG. 1, the handle 3 of the first tool portion 1 and the handle 3 of the second tool portion 2 are pivotally connected at their ends by a shaft 18. Therefore, the support shaft 18 is a pivot point of the first tool portion 1 and the second tool portion 2. In a preferred embodiment, the support shaft 18 is located at a first end of the handle 3 of the first tool portion 1 and a first end of the handle 3 of the second tool portion 2, just like a conventional clamp type hand. tool.

The individual jaws 9 transfer the clamping force from the handle 3 to an external object; wires, bolts, and steel plates can be used as non-limiting examples of external objects. Unlike the conventional clamp type hand tool, the handle 3 and the independent jaw 9 are not rigidly coupled together, but can be independently moved. The independent jaw 9 includes a clamping end 10 and a tapered end 11. The clamping end 10 contacts an external object and applies pressure to the external object. The tapered end 11 is mechanically coupled to the handle 3 via the cam 13 to amplify the The clamping force of the handle 3. The independent jaw 9 is connected to the handle 3 via the jaw groove 6. The jaw groove 6 is mechanically coupled to the handle 3 and adjacent to the support shaft 18, and is shaped and sized to be complementary to the independent jaw 9. The tapered end 11 is located within the jaw groove 6, and the independent jaw 9 is rotatably coupled to the handle 3 by the fulcrum 18. Therefore, the handle 3 of the first tool portion 1 and the independent jaws 9 and the handle 3 of the second tool portion 2 and the independent jaws 9 rotate about the support shaft 18. As shown in FIG. 3, the support shaft 18 is located between the clamping end 10 and the tapered end 11.

Please refer to Figure 4. The jaw groove 6 includes a first groove region 7 and a second groove region 8. The first trough area 7 is located at the end of the handle 3 and adjacent to the fulcrum 18. The first trough area 7 houses the body of the individual jaws 9. The first groove region 7 extends through the inner shank 4 and the outer shank 5 of the handle 3. The second trough area 8 is adjacent to the first trough area 7 and opposite to the clamping end 10 and accommodates the tapered end 11 of the individual jaws 9. The second trough area 8 traverses the handle 3 from the inner surface, and the tapered end 11 is located within the second trough area 8.

In the present invention, the cam 13 is a claw-like member that provides a ratchet function for increasing the overall leverage. As shown in Fig. 2, the cam 13 has an elliptical projection. The cam 13 is mounted within the jaw groove 6. In a preferred embodiment, the cam 13 is rotatably mounted within the nipple slot 6, and a rotational axis 14 of the cam 13 is parallel to the fulcrum 18. In another embodiment, the cam 13 is secured within the jaw slot 6. The cam 13 includes a free end 15 and a fixed end 16. The fixed end 16 is rotatably mounted to the rotating shaft 14 of the cam 13, and the free end 15 is arranged toward the support shaft 18. The cam 13 is located within the second groove region 8 and between the handle 3 and the tapered end 11. When pressure is applied to the handle 3, the cam 13 is urged to contact the tapered end 11. The curvature of the cam 13 determines the power ratio of the present invention. To generate a mechanical lever, the rotating shaft 14 of the cam 13 and the support shaft 18 compensate each other along the handle 3. The size, shape, and curvature of the handle 3 can be varied to increase or decrease the power ratio of the present invention.

The retaining spring 20 can extendly attach the independent jaw 9 to the handle 3 so that when the pressure on the handle 3 is relieved, the cam 13 can be urged to contact the tapered end 11. A retaining spring 20 is located within the second slot region 8 adjacent the cam 13 and opposite the axle 18. As shown in FIG. 3, the retaining spring 20 is stretchably coupled to the tapered end 11 and the handle 3.

The opening and closing of the present invention is like other pairs of tools, clamps, and the like. How to apply significant force to an external object using the present invention will be described below. The following description is equally applicable to the first tool portion 1 and the second tool portion 2. First, the user places an external object between the pinch end 10 of the first tool portion 1 and the pinch end 10 of the second tool portion 2. The handle 3 of the first tool portion 1 is then pressed toward the handle 3 of the second tool portion 2 until the clip end 10 is in contact with an external object. Once the clamping end 10 is in contact with the external object, the pressure from the handle 3 urges the cam 13 to contact the tapered end 11. The point of contact of the cam 13 with the tapered end 11 is initially at the free end 15 of the cam 13, i.e. the portion of the cam 13 closest to the support shaft 18. As the pressure on the handle 3 gradually increases, the contact point gradually moves from the free end 15 of the cam 13 toward the fixed end 16 of the cam 13. At the same time, the clamping end 10 of the first tool portion 1 and the clamping end 10 of the second tool portion 2 move toward each other, and the retaining spring 20 also expands. This will output pressure to the external object to cut, crush, or hold the external object. Once the significant resistance from the external object is encountered, release the handle 3 to begin the ratchet function. When the pressure is released from the handle 3, the retaining spring 20 contracts and forces the cam 13 back to the original position, however the independent jaw 9 does not release the outer object. This initial position is determined by the cam 13 being disengaged from the tapered end 11 and toward the fulcrum 18. The user then applies pressure to the handle 3 again. At this time, the cam 13 contacts the tapered end 11 at a lower contact point and exits from the support shaft 18. This lower contact point is defined by a contact point that is further away from the fulcrum 18. The movement of the contact point corrects the angle of the pressure from the handle 3, so that the independent jaw 9 is applied with a greater pressure Force, while external objects are also subjected to greater pressure. The above process can be repeated multiple times to output greater pressure by the ratchet function.

Please refer to FIG. 2 and FIG. 3. The first tool portion 1 and the second tool portion 2 are pivotally connected to each other by the pivot pin 19 . The pivot pin 19 is of a cylindrical configuration placed in parallel and overlapping the fulcrum 18. The pivot pin 19 passes through the handle 3 of the first tool portion 1 , the independent jaw 9 of the first tool portion 1 , the handle 3 of the second tool portion 2 , and the independent jaw of the second tool portion 2 9. Therefore, the first tool portion 1 and the second tool portion 2 are pivotally connected to each other by a pivot pin 19 to form a clamp type mechanism.

In a preferred embodiment of the invention, the independent jaw 9 further includes a curved side 12 that allows the cam 13 to smoothly contact the tapered end 11 and form an effective force transmitting means. The curved side 12 is adjacent to the tapered end 11 of the independent jaw 9 and faces the handle 3 within the jaw slot 6, a side 17 of the cam 13 abutting against the curved side 12. In a preferred embodiment of the invention, the curved side 12 is formed as a concave edge and complements the side 17 of the cam 13, as shown in FIG. In another embodiment, the curved side 12 is formed as a flange and the side 17 of the cam 13 is formed as a concave edge to complement each other and to ensure a smooth contact with each other.

The invention can be made into a variety of different forms of clamps, resulting in a variety of different applications. The invention can be implemented in the following forms: joint pivot clamp, oblique clamp, wiring clamp, pointed clamp, tweezers, crimping pliers, peeling pliers, vise, circlip pliers, and round nose clip Clamps and the like, however, the invention is not limited by the above forms. Referring to FIG. 2, in an embodiment, the present invention can be made into a conventional wire cutter, wherein the first tool portion 1 and the second tool portion 2 each have a blade 21, and the cutting edge 21 is the clip. The sharp part of the end 10 is used to press and cut the external object. The cutting edge 21 is mechanically coupled to the clamping end 10 and perpendicular to the fulcrum 18. Like the conventional clamp and scissors type tool, the cutting edge 21 of the first tool portion 1 And the cutting edges 21 of the second tool portion 2 face each other. In other embodiments of the invention, the cutting edge 21 may be replaced by a non-sharp blunt edge for gripping external objects.

In other embodiments of the invention, the handle 3 is mounted to the independent jaw 9 via at least one pivot point, the cam 13 being a curved ellipse and the free end 15 being remote from the collar 18.

The present invention has been described by way of example only, however, these embodiments are merely intended to illustrate the invention and not to limit the scope of the invention. Any modifications or variations that do not depart from the spirit of the invention are intended to be included within the scope of the invention.

1‧‧‧First Tools Department

2‧‧‧Second Tools Division

3‧‧‧handle

4‧‧‧ inner handle

5‧‧‧Outer handle

6‧‧‧Clamp head slot

9‧‧‧Independent clamp head

10‧‧‧Clamping end

11‧‧‧

12‧‧‧Bent side

13‧‧‧ cam

14‧‧‧Rotary axis

15‧‧‧Free end

16‧‧‧ fixed end

17‧‧‧ side

19‧‧‧ pivot pin

20‧‧‧ Keep the spring

21‧‧‧ cutting edge

Claims (15)

A labor-saving forceps comprising: a first tool portion; and a second tool portion; wherein the first tool portion and the second tool portion each comprise: a handle, a clamp head slot, an independent clamp head, and a cam; the independent clamp head includes: a clamping end and a tapered end; the handle of the first tool portion and the handle of the second tool portion are pivotally connected at an end thereof by a shaft; the pliers a head slot is coupled to the handle and adjacent to the support shaft; a tapered end of the independent clamp head is received in the clamp head slot; the independent clamp head is rotatably coupled to the handle by the support shaft; The shaft is located between the clamping end and the tapered end; the cam is mounted within the jaw groove; the cam is located between the handle and the tapered end. The labor-saving forceps of claim 1, wherein the handle comprises: an inner handle surface and an outer handle surface; the clamp head slot comprises: a first groove area and a second groove area; a groove region is located at an end of the handle and adjacent to the support shaft; the first groove region extends through the inner shank of the handle and the outer shank; the second groove region is adjacent to the first groove region, and relative to the a clamping end; the second groove region traverses the handle from the inner surface; The cam and the tapered end are located within the second groove region. A labor-saving forceps according to claim 1, further comprising a pivot pin, wherein the pivot pin is placed in parallel and overlaps the support shaft; the pivot pin passes through the first tool portion a handle, the independent jaw of the first tool portion, the handle of the second tool portion, and the independent jaw of the second tool portion; the first tool portion and the second tool portion are supported by the pivot The pins are pivotally connected to each other. The labor-saving forceps of claim 1, wherein the first tool portion and the second tool portion each include a retaining spring; the retaining spring is located within the jaw groove; the retaining spring is adjacent to the cam, And relative to the fulcrum; the retaining spring is extendably coupled between the tapered end and the handle. The labor-saving forceps of claim 1, wherein the first tool portion and the second tool portion each include a blade; the cutting edge is mechanically coupled to the clamping end; the cutting edge is perpendicular to the branch a shaft; the cutting edge of the first tool portion and the cutting edge of the second tool portion face each other. The labor-saving forceps of claim 1, wherein the cam comprises: a free end and a fixed end; the cam is rotatably mounted in the jaw groove; a rotation axis of the cam is parallel to the a fulcrum; the rotating shaft of the cam and the fulcrum mutually compensated along the handle; the fixed end is rotatably mounted to the handle by the rotating shaft of the cam; The free end faces the fulcrum. The labor-saving forceps of claim 1, wherein the independent jaw further comprises a curved side; the curved side is adjacent to the tapered end of the independent jaw; the curved side is oriented within the jaw groove The handle; a side of the cam abuts against the curved side. The labor-saving forceps of claim 7, wherein the curved side is formed as a concave edge. A labor-saving forceps comprising: a first tool portion; and a second tool portion; wherein the first tool portion and the second tool portion each comprise: a handle, a clamp head slot, a retaining spring, and an independent a clamping head, and a cam; the independent clamping head includes: a clamping end and a tapered end; the handle of the first tool portion and the handle of the second tool portion are pivotally connected at an end thereof by a shaft; The clamp head slot is coupled to the handle and adjacent to the support shaft; the tapered end of the independent clamp head is received in the clamp head slot; the independent clamp head is rotatably coupled to the handle by the support shaft; a fulcrum is located between the clamping end and the tapered end; the cam is mounted in the nipper groove; the cam is located between the handle and the tapered end; a rotating shaft of the cam is parallel to the fulcrum; The retaining spring is located within the jaw slot; the retaining spring is adjacent the cam and relative to the collar; the retaining spring is extendably coupled to the tapered end and the handle. The labor-saving forceps of claim 9, wherein the handle comprises: an inner handle surface and an outer handle surface; the clamp head slot comprises: a first groove area and a second groove area; a groove region is located at an end of the handle and adjacent to the support shaft; the first groove region extends through the inner shank of the handle and the outer shank; the second groove region is adjacent to the first groove region, and relative to the a clamping end; the second groove region traverses the handle from the inner surface; the cam and the tapered end are located within the second groove region. A labor-saving forceps according to claim 9 further comprising a pivot pin, wherein the pivot pin is placed in parallel and overlaps the support shaft; the pivot pin passes through the first tool portion a handle, the independent jaw of the first tool portion, the handle of the second tool portion, and the independent jaw of the second tool portion; the first tool portion and the second tool portion are supported by the pivot The pins are pivotally connected to each other. The labor-saving forceps of claim 9, wherein the first tool portion and the second tool portion each have a blade; the cutting edge is mechanically coupled to the clamping end; the cutting edge is perpendicular to the branch a shaft; a cutting edge of the first tool portion and a cutting edge of the second tool portion face each other. According to the labor-saving forceps according to claim 9 of the patent application scope, wherein The cam includes a free end and a fixed end; the rotating shaft of the cam and the supporting shaft mutually compensate along the handle; the fixed end is rotatably mounted to the handle by the rotating shaft of the cam; the free end faces the Support shaft. The labor-saving forceps of claim 9, wherein the independent jaw further comprises a curved side; the curved side is adjacent to the tapered end of the independent jaw; the curved side is oriented within the jaw groove The handle; a side of the cam abuts against the curved side. The labor-saving forceps of claim 14, wherein the curved side is formed as a concave edge.