JPH0236700Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is applicable to the case where the nut receivers of the upper jaw member and the lower jaw member, which are respectively pivotally connected to the tip of the handle, are fitted into the nut, and when the handle is rotated downward. The present invention relates to a ratchet wrench in which an upper jaw member automatically opens when a nut is tightened and a handle is rotated upward, allowing the entire wrench to freely rotate upward relative to the nut.

(Prior Art) The above-mentioned ratchet trench has been known for a long time, as shown in Japanese Utility Model Publication No. 54-21835, but in this type of ratchet trench, the upper jaw member and the lower jaw member are completely separated. Because the structure is such that it cannot securely hold the nut unless it is in the closed state, it is necessary to use a special tool for each nut size. For example, to tighten three sizes of nuts,
I had to prepare a book ratchet trench.

(Problems to be solved by the invention) The purpose of this invention is to solve the above-mentioned conventional problems and to create a ratchet trench that can reliably tighten nuts of both large and small diameters. It is complete.

(Means for Solving the Problems) The present invention is a ratchet trench in which an upper jaw member and a lower jaw member each having a nut receiving portion are pivotally connected to the tip of a handle by a pin, and the ratchet trench is provided in the upper jaw member 5. The eccentric part 8 of the pin 7 is fitted into the through hole 6, and a disc 10 with a plurality of notches 9 for locking rotation of the eccentric part 8 is attached to the pin 7, and the upper and lower jaw members are connected to each other. The feature is that the interval between the two can be adjusted.

(Example) Next, the present invention will be described in detail with reference to the illustrated embodiments. 1 is a handle having a bifurcated tip 2; 3 is a handle pivotally connected to the tip 2 of the handle 1 by a pin 4; The lower jaw member 5 is also an upper jaw member pivotally attached to the tip 2 of the handle 1 by a pin 7 having an eccentric portion 8. A through hole 6 is provided at the base end of the upper jaw member 5, and an eccentric portion 8 of a pin 7 attached to the distal end portion 2 of the handle 1 is fitted into the through hole 6. As a result, when the eccentric part 8 is rotated to the left in the drawing as shown in FIG. When rotated to the right as shown in the figure, the upper jaw member 5 approaches the lower jaw member 3. A disk 10 with notches 9 carved in multiple places around the circumference is attached to the upper surface of the pin 7 having an eccentric portion 8, and a stopper that engages with these notches 9 is attached to the tip 2 of the handle 1. 11 is provided under the spring 12. In the embodiment shown, three notches 9 are formed, allowing the upper jaw member 5 to be moved to positions corresponding to three sizes of nuts;
The structure is such that rotation of the pin 7 can be stopped at each position. Further, nut receiving portions 13 and 14 are formed on the upper jaw member 5 and the lower jaw member 3 as shown in the figure. These nut receiving parts 13 and 14 are recessed parts in the shape of a hexagon divided into two parts, similar to the conventional one.

Note that 15 is a spring for keeping the upper end surface of the lower jaw member 3 and the lower end surface of the upper jaw member 5 in close contact with each other at all times.

(Function) With this structure, the upper jaw member 5 is moved forward or backward to match the opening width of the nut receivers 13, 14 with the outer diameter of the nut 30, and the upper jaw member 5 is moved forward or backward. By fitting the nut 30 and swinging the handle 1 up and down, the upper jaw member 5 and the lower jaw member 3 will securely hold the nut 30 when the handle 1 is rotated clockwise in the drawing. When the handle 1 is rotated counterclockwise, the upper jaw member 5 and the lower jaw member 3 open clockwise to release the nut 30 and allow the entire ratchet trench to rotate freely. It is possible. In addition, if the nut 30 has a small diameter, the second
As shown in the figure, two of the nut receiving parts 13 and 14
The two corners ensure that the nut 30 is held and rotated. Note that if the straight line L connecting these corners is made parallel to the mating surface 16 of the upper jaw member 5 and the lower jaw member 3 as in the embodiment, the forward and backward movement of the upper jaw member 5 will be performed along this straight line L. Therefore, the positional relationship between the nut receivers 13 and 14 is constant regardless of the diameter of the nut, and the nut 30 is held securely.
Further, the center of the nut is also located on this straight line L, and as a result, the relationship between the direction of the handle 1 and the position of the center of the nut is almost constant, and no discomfort occurs during use. Therefore, in the Rachiets trench of the present invention, not only the case shown in Fig. 1, but also the
Also in the case shown in FIG. 2, the nut can be reliably tightened.

(Effects of the invention) As explained above, the present invention has the following advantages:
Both large-diameter nuts and small-diameter nuts can be rotated by a single ratchet trench. Therefore, according to the present invention, there is no need to prepare as many ratchet trenches as there are nut sizes, unlike the conventional method. Therefore, the present invention has extremely great practical value as a Rachiets trench that eliminates the problems of the conventional method.

[Brief explanation of the drawing]

All drawings show examples of the present invention.
FIG. 1 is a plan view showing a state in which a large-diameter nut is tightened, and FIG. 2 is a plan view showing a state in which a small-diameter nut is tightened. 1: handle, 2: tip, 3: lower jaw member,
4: Pin, 5: Upper jaw member, 7: Pin, 13,1
4: Nut receiving part.

Claims (1)

[Scope of utility model registration request] This is a ratchet trench in which an upper jaw member 5 and a lower jaw member 3 each having nut receiving parts 13 and 14 are pivotally connected to the tip end 2 of a handle 1 by pins 4 and 7, and the upper jaw member 5 has a through hole provided therein. The eccentric part 8 of the pin 7 is fitted to the pin 6, and a disc 10 with a plurality of notches 9 for locking the rotation of the eccentric part 8 is attached to the pin 7. A ratchet trench characterized by adjustable spacing.