CN2313710Y

CN2313710Y - Back-returnable wrench

Info

Publication number: CN2313710Y
Application number: CN 96214459
Authority: CN
Inventors: 潘世林
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-06-18
Filing date: 1996-06-18
Publication date: 1999-04-14
Anticipated expiration: 2006-06-18

Abstract

The utility model relates to a returnable solid wrench. The utility model is composed of a jaw and a handle, wherein, the jaw is composed of a long side edge, a short side edge, a top edge, and two bottom edges, the length of the long side edge is equal to the length of the bottom edge which is adjacent to the long side edge; the length of the short side edge is equal to or is smaller than one third of the length of the long side edge, and a cut angle of 120 DEG is formed between the two bottom edges; a cut angle of 120 DEG is arranged between the long side edge and the bottom edge which is adjacent to the long side edge; a cut angle of 105 DEG to 118 DEG is formed between the short side edge and the bottom edge which is adjacent to the short side edge. By means of the jaw with a special shape, the returnable solid wrench has the function of return, and therefore, the utility model has the advantages of convenient use and high work efficiency.

Description

But backhaul fork spanner

What the utility model was related is a kind of fork spanner, belongs to hand tools.

When using the tight nut of existing fork spanner, whenever twist an angle and spanner will be withdrawed from nut, turn round 60 °, 120 ° or 180 ° then, again be stuck on the nut and twist again, so repeated multiple times could be tightened nut, therefore uses inconvenience, and operating efficiency is not high yet.

The purpose of this utility model provides a kind of fork spanner with backhaul function, to save the existing above-mentioned service routine of spanner, increases work efficiency.

The purpose of this utility model is achieved in that the long side of jaw of spanner one side is shorter, and long side is a long side, and short side is short side.Short side is equal to or less than 1/3rd of long side.Long side equates with an adjacent base.The distance of two base angle of cut bisectors and short side and top margin intersection point equals the distance of this bisector and long side.The angle of cut on long side and adjacent base is 120 °.The two base angles of cut are 120 °.The angle of cut on short side and adjacent base is 105 ° to 118 °.When spanner blocks nut toward clockwise direction when screwing nut, short side and long side just can block nut, and nut rotates thereupon.If toward revolution counterclockwise, short side is because can not be able to eat power less than 1/2nd of the monolateral length of nut, at this moment because the effect on the base adjacent with short side, add cooperating of existing gap between nut and the jaw simultaneously, spanner revolution and nut is motionless when spanner is turned back to 60 °, can be blocked nut again again, so just, finished the process of backhaul, then just again an an ancient unit of weight equal to 20 or 24 *taels of silver firmly continue tightening nuts toward clockwise direction.If spanner is taken off, a long side and a short side conversion position are stuck on the nut again, again towards counterclockwise with strength, just can be in the same way loosen nut easily and efficiently.

Owing to adopted such scheme, the fork spanner that the utility model is released has backhaul function, thereby easy to use and high efficiency.

Below in conjunction with drawings and Examples, the utility model is described in further detail.

Fig. 1 is first embodiment.Fig. 2 is second embodiment.Fig. 3 is the 3rd embodiment.Fig. 4 is the fundamental diagram of this spanner.

Among the figure, the short side EF of the short side D ' E ' of 1. main jaw 2. handles 3. secondary jaw AB long side A ' B ' long side BC base CD base, B ' C ' base C ' D ' base DE top margin E ' F ' top margin

As shown in Figure 1, first embodiment is a double (end) wrench.In main jaw [1], long side equals to lead mutually base (AB=BC).Short side is equal to or less than 1/3rd (DE≤1/3AB) of long side.The distance of two base angle of cut bisectors and short side and top margin intersection point equals the distance (GE=GH) of this bisector and long side.The angle of cut of long side and base BC is 120 ° (∠ ABC120 °).The two base angles of cut are 120 ° (∠ BCD=120).Base CD is 105 ° to 118 ° (∠ CDE=105 ° ~ 118 °) with the angle of cut of short side; this angle of cut drops on the limit of nut rather than on the angle of nut less than 120 ° of contact points that can make short side DE and nut; so not only helped to tighten six angles that nut prevents to skid but also can protect nut, made its not frayed (referring to Fig. 4, Fig. 5).The angle of two base angle of cut bisectors and handle [2] center line is 13 ° to 17 ° (∠ α=13 ° ~ 17 °).Top margin is parallel to and the adjacent base CD (EF ∥ CD) of short side, perhaps the extended line of top margin and base CD or its extended line intersect, its angle is less than 15 ° (∠ β＜15 °), can make the angle of cut ∠ DEF of short side and top margin big as far as possible like this, help backhaul, also can make this angle of cut place more wear-resisting withstand voltage (referring to Fig. 4, Fig. 5).The intersection point C ' of secondary jaw [3] two base B ' C ' and C ' D ' and the intersection point C on main jaw two bases the same side at handle [2] center line.Long side A ' the B ' of secondary jaw and the long side AB of main jaw are in the not side then of handle center's line.The short side D ' E ' of secondary jaw and the not homonymy of the short side DE of main jaw at handle center's line.Secondary jaw and main jaw are measure-alike, that is: A ' B '=AB, B ' C '=BC, C ' D '=CD, D ' E '=DE, E ' F '=EF, ∠ A ' B ' C '=∠ ABC, ∠ B ' C ' D '=BCD, ∠ C ' D ' E=∠ CDE, ∠ D ' E ' F=∠ DEF, ∠ α '=∠ α.Main jaw and secondary jaw are used, and block nut again for 180 ° as the upset of the same jaw of existing fork spanner, can obtain one less than 60 ° operating angle.

As shown in Figure 2, second embodiment and the first embodiment difference are: the intersection point C on the intersection point C ' on secondary jaw [3] two bases and main jaw [1] two base is at the not homonymy of handle center's line, secondary jaw long side A ' B ' and main jaw long side AB are in the same side of handle center's line, and short side D ' E ' of secondary jaw and main jaw are lacked side DE the same side at handle center's line.

As shown in Figure 3, the 3rd embodiment is a single-end spanner, and the bisector of its jaw two base angles of cut overlaps with the handle center line.

Operation principle of the present utility model is: when spanner blocked the nut clockwise direction and exerts oneself, jaw will be with nut to rotate and nut screwed (see Fig. 4, this moment, the position of spanner was shown in the heavy line, and the arrow indication is that spanner is subjected to force direction or rotation direction among the figure).When turning round toward counter clockwise direction, short side is because less than 1/2nd of the monolateral length of nut, be unable to eat power, add cooperating of natural gap (for ease of not drawing among mapping this gap figure) between the effect on the base adjacent and nut and long Jie limit and the short side, spanner rotation and nut is motionless with short side.In this process, jaw can withdraw from a bit (the spanner position is shown in the fine line) naturally.When being turned back to 60 ° (position is shown in the dotted line this moment), the user unconscious apply under the effect of the thrust of nut direction, spanner just can move to the nut direction, again block the nut (see figure 5), so just, finished turning course, just can spare time past clockwise direction then again and exert oneself, continue tightening nuts.If spanner is taken off, long side and short side commentaries on classics are lifted a position, be stuck in again on the nut, pull and can unscrew nut towards moulding clockwise again.

Claims

1. but a backhaul fork spanner is made of jaw and handle, it is characterized in that: jaw is made of long side (AB), short side (DE), top margin (EF) and two bases (BC and CD).

2. fork spanner according to claim 1, it is characterized in that: the angle of cut on long side and adjacent base is 120 ° (∠ ABC=120 °), the angle of cut on two bases is 120 ° (∠ BCD=120 °), and the angle of cut on short side and adjacent base is 105 ° to 118 ° (∠ CDE=105 ° ~ 118 °).

3. fork spanner according to claim 1 is characterized in that: it is crossing with this base or its extended line that top margin is parallel to the extended line of base (EF ∥ CD) adjacent with short side or top margin, and its angle is less than 15 ° (∠ β＜15 °).

4. fork spanner according to claim 1 is characterized in that: the distance of the intersection point of two base angle of cut bisectors and short side and top margin equals the distance (GE=GH) of this bisector and long side.

5. fork spanner according to claim 1 is characterized in that: long side equals adjacent base (AB=BC), and short side is equal to or less than 1/3rd (DE≤1/3AB) of long side.

6. fork spanner according to claim 1 is characterized in that: the angle of two base angle of cut bisectors and handle center's line is 13 ° to 17 ° (∠ α=13 ° ~ 17 °).

7. fork spanner according to claim 1 is characterized in that: its jaw has main jaw and secondary jaw, and two jaws are measure-alike.

8. according to claim 1 and 7 described fork spanners, it is characterized in that: the intersection point on secondary jaw two bases and the intersection point on main jaw two bases are in the same side of handle center's line, secondary jaw long side and main jaw long side are at the not homonymy of handle center's line, and the short side of short side of secondary jaw and main jaw is at the not homonymy of handle center's line.

9. according to claim 1 and 7 described fork spanners, it is characterized in that: the intersection point on secondary jaw two bases and the intersection point on main jaw two bases are at the not homonymy of handle center's line, secondary jaw long side and main jaw long side are in the same side of handle center's line, and the short side of short side of secondary jaw and main jaw is in the same side of handle center's line.

10. fork spanner according to claim 1 is characterized in that: its jaw has only one, and two base angular bisectors overlap with the handle center line.