JP4479972B2 - Small flag wrench, small flag wrench wrench member and small flag wrench knob member - Google Patents

Description

  The present invention relates to a small flag wrench, a small flag wrench wrench member, and a small flag wrench knob member for attaching and detaching fasteners such as bolts and screws.

  Conventionally, a metal wrench is used to attach and detach a cutting tool for machining. As this type of wrench, those using only a metal that does not use a resin have been put into practical use for environmental reasons. FIG. 13 shows an example. As shown in FIG. 13, the wrench 41 has a simple knob 42 formed in a loop shape. With this wrench 41, it is necessary to reduce material costs and the like, and the simple knob 42 cannot be enlarged. Therefore, when the operator uses this wrench 41 to manually tighten a bolt or the like, the simple knob 42 may be small and the tightening torque may be insufficient. When the tightening torque is insufficient, it is necessary to tighten with a tool such as pliers. In this case, it is difficult to tighten with an appropriate torque, and the wrench 41 is broken due to excessive tightening. There's a problem. Further, in the wrench 41, in addition to the necessity of performing some kind of anti-slip treatment, when the loop-shaped simple knob 42 is formed, misalignment occurs between the distal end side and the proximal end side. Therefore, a bending process for adjusting the misalignment is also required, which causes a problem that the manufacturing cost increases.

  As a countermeasure, a wrench 44 (see FIG. 14) in which a large knob member 43 is formed of resin has been put into practical use. In this type of wrench 44, the resin knob member 43 and the metal wrench member 45 are integrally formed for the purpose of ensuring rigidity, and the knob member 43 cannot be attached or detached. . In addition, the knob member 43 normally uses a hard resin in order to improve the feeling of use. Since the knob member 43 made of this hard resin may be broken during tightening, it is difficult to increase the tightening torque. Further, when the resin knob member 43 is damaged, there is a problem that it cannot be reused (reused) for each part.

The present applicant has proposed a split structure wrench in which a resin knob member is configured to be detachable from the wrench member (see Patent Document 1). As shown in FIG. 15, in the wrench 46, the wrench member 47 has an L shape and has a relatively long main shaft 48 and a short shaft 49 bent at a right angle from the main shaft 48. The short axis side of the wrench member 47 is detachably fitted and fixed in the fixing hole 52 of the knob member 51. Similarly, Patent Documents 2 and 3 propose a wrench having a split structure in which an L-shaped wrench member and a knob member are detachable.
JP 2003-285275 A (FIG. 1 etc.) Utility Model No. 3054487 (FIG. 1 etc.) Japanese Utility Model Publication No. 6-5867 (FIG. 1 etc.)

  However, when the knob member 51 is formed of hard resin and the wrench member 47 is L-shaped like the split structure wrench 46, the resin knob member 51 is often damaged, and the resin knob The reuse of the member 51 was difficult. Specifically, when the bolt is fastened using the wrench 46, stress concentrates on the tip of the short shaft 49 fitted to the knob member 51, and the knob member 51 is damaged. Thus, with the conventional split structure wrench 46, it is difficult to increase the tightening torque due to the structure.

  The present invention has been made in view of the above-mentioned problems, and the object thereof is to have a split structure in which the wrench member and the knob member are detachable, and to securely tighten the fastener without damaging the knob member. It is to provide a small flag-shaped wrench that can. Another object of the present invention is to provide a wrench member and a knob member suitable for use in a small flag wrench.

  Means for solving the above problems (means 1) include a main shaft on which an engaging portion capable of engaging with a fastener is formed, a short shaft formed by bending a base end of the main shaft at a right angle, and the short shaft. It has a rod-like and metal wrench member that is formed at the tip of the shaft and has a stress dispersion part that is longer in the main shaft direction than the diameter of the short shaft, and has a side surface, an upper surface, and a lower surface. A synthetic resin knob body having a wrench member fixing hole formed in the lower surface, and a knob protrusion integrally formed so as to protrude from the upper surface of the knob body. There is a small flag wrench characterized in that a bent base end side of the wrench member is detachably fitted and fixed to the wrench member fixing hole.

  Therefore, when using the small flag wrench of the means 1, the operator holds the small flag wrench by holding the knob body of the knob member with a finger, and engages the engaging portion of the main shaft of the wrench member with the fastener. Then, the fastener is quickly temporarily tightened by turning the knob protrusion of the knob member. Thereafter, the fastener is securely tightened with a predetermined torque by turning the knob body. In this small flag wrench, the base end side of the wrench member that is fitted and fixed in the wrench member fixing hole of the knob body is formed at the short axis by bending the base end of the main shaft at a right angle, and at the tip of the short shaft The stress distribution part is provided. Since the stress dispersion part is formed longer in the principal axis direction than the short axis diameter, the stress applied to the tip of the short axis when the fastener is tightened can be reliably dispersed by the stress dispersion part. As a result, damage to the synthetic resin knob body can be avoided, and the fastener can be securely tightened. In addition, the small flag wrench has a split structure in which the rod-shaped and metal wrench member and the synthetic resin knob member are detachable, so if one of the members is damaged due to multiple use, If the damaged member is replaced, the wrench can be reused. Therefore, compared with the conventional wrench which replaces the whole wrench, parts cost can be reduced.

  In the present invention, “bent at a right angle” is not limited to the case of bending at an angle of 90 ° strictly, but means a state of being bent at a substantially right angle, and more specifically, as a wrench member. This means that the sheet is bent at a substantially right angle within a range in which the above function can be performed, and includes a case of bending at an angle of 90 ± 30 °, for example.

  Further, as another means (means 2) for solving the above problems, a bent base end side can be detachably fitted and fixed to a wrench member fixing hole of a small flag wrench knob member and A wrench member made of metal, which is formed at a main shaft on which an engaging portion capable of engaging with a fastener is formed, a short shaft formed by bending a base end of the main shaft at a right angle, and a tip of the short shaft. There is a wrench member for a small flag-shaped wrench characterized by comprising a stress dispersion portion that is longer in the principal axis direction than the minor axis diameter.

  Therefore, according to the wrench member for the small flag-shaped wrench of the means 2, the base end side has a short axis formed by bending the base end of the main shaft at a right angle, and a stress dispersion portion formed at the tip of the short shaft. Is provided. Since the stress dispersion part is formed longer in the principal axis direction than the diameter of the short axis, the stress applied to the tip of the short axis when the fastener is tightened can be reliably dispersed by the stress dispersion part. As a result, breakage of the small flag wrench knob member can be avoided, and the fastener can be securely tightened.

  It is preferable that the stress dispersion portion bends the distal end of the short axis so as to face the same direction as the distal end direction of the main shaft, and the base end side of the wrench member is substantially U-shaped. In this case, the stress distribution part can be easily formed, and the manufacturing cost of the wrench member for a small flag-shaped wrench can be reduced. Further, since the base end side of the wrench member is substantially U-shaped, the base end of the wrench member can be reliably fixed to the wrench member fixing hole.

  It is preferable that the stress dispersion portion is formed so as to move away from the main axis as it goes to the tip side. In this case, when the base end side of the wrench member is fitted to the wrench member fixing hole, the distal end side of the stress dispersion portion is pressed against the inner wall surface of the wrench member fixing hole, thereby ensuring the wrench member without rattling. Can be fixed.

  Furthermore, as another means (means 3) for solving the above-mentioned problem, a bent member of the metal small flag wrench wrench member is a knob member that can be detachably fitted and fixed. A synthetic resin knob body having a side surface, an upper surface, and a lower surface, and having a chip shape that can be held by an operator with a finger, and having a wrench member fixing hole formed in the lower surface, and the knob body A knob protrusion integrally formed so as to protrude from the upper surface of the wrench, and an opening area of the wrench member fixing hole occupying the lower surface is 13% or more and 50% or less, and the wrench with respect to the vertical dimension of the knob body The depth of the member fixing hole is 40% or more and 90% or less, and the volume of the wrench member fixing hole with respect to the volume of the knob body is 10% or more and 40% or less. There are members knob for small banner type wrench, wherein the Rockwell hardness of the resin is 80 or higher in H scale.

Therefore, according to the small flag wrench knob member of the means 3, a wrench member fixing hole is formed in the lower surface of the synthetic resin knob main body, and a metal small flag wrench wrench is formed in the wrench member fixing hole. The base end side of the member is fitted and fixed. When the small flag wrench is used, the fastener is quickly temporarily tightened by the operator turning the knob protrusion integrally formed on the upper surface of the knob body. Thereafter, when the operator pinches and turns the knob body, the fastener is securely tightened with a predetermined torque. In the small flag wrench knob member of the present invention, the opening area of the wrench member fixing hole occupying the lower surface is 13% or more and 50% or less, and the depth of the wrench member fixing hole with respect to the vertical dimension of the knob body. Is 40% or more and 90% or less, and the volume of the wrench member fixing hole with respect to the volume of the knob body is 10% or more and 40% or less. The strength of is reduced. Therefore, by forming the knob body using a hard synthetic resin having a Rockwell hardness of 80 or more in H scale, the strength can be sufficiently secured, and the knob body can be prevented from being damaged during use. .
The wrench member fixing hole occupying the lower surface of the knob main body can detachably fix the wrench member, and considering the strength of the knob main body, it is necessary to satisfy the preferable ranges of the opening area, depth and volume at the same time. It is. When the opening area is less than 13%, it becomes difficult to attach and detach the wrench member, while when it exceeds 50%, the knob body becomes thin and the strength of the wrench member decreases. Further, when the depth is less than 40%, the wrench member is easily detached from the knob member, and it is difficult to perform wrench tightening with sufficient force. When the depth exceeds 90%, the knob member becomes thin, and the knob member is easily damaged when the wrench is tightened. Furthermore, when the volume is less than 10%, it becomes difficult to attach and detach the wrench member depending on the opening shape of the wrench member fixing hole. In addition, the wrench member is easily detached from the knob member, and it is difficult to perform wrench tightening with sufficient force. When the volume exceeds 40%, the knob member becomes thin, and the knob member is easily damaged when the wrench is tightened. In addition, the wrench member fixing hole is preferably formed so as to have a shape that includes a center portion on the lower surface of the knob main body and that is subject to left and right and up and down. Furthermore, it is preferable to use a hard resin having a Rockwell hardness of 90 or more and 100 or less on the H scale in terms of avoiding damage to the knob body at the time of use, but considering the material cost and workability, etc. Resin with a certain hardness should be selected according to the application.

  The synthetic resin constituting the knob body is preferably a cellulose acetate resin. The reason for this is that cellulose acetate-based resins have characteristics such as toughness, resistance to cracking, and excellent impact resistance, and excellent oil resistance and good hand-picking feel. Because. In addition, the cellulose acetate-based resin can be freely colored. For this reason, you may color a knob main body with a different color according to the size of a wrench member. In this case, the wrench size can be recognized by the color of the knob body, which is practically preferable.

  It is preferable that the knob body has a plurality of ribs extending along the vertical direction of the knob member on the side surface. In this case, when the operator pinches and turns the knob body by hand, the plurality of ribs function as slip stoppers, and the small flag-shaped wrench can be reliably turned to improve workability.

  It is preferable that the knob main body has a depression at the center of the side surface. Thus, if there is a dent in the center of the side surface, the knob body can be easily pinched, so that the small flag-shaped wrench can be reliably rotated and workability can be improved.

  It is preferable that the knob body is formed in a concave shape in which the entire side surface is curved. In this way, if the entire side surface of the knob body is formed in a curved concave shape, the knob body can be easily pinched, so that the small flag wrench can be reliably turned and workability can be improved.

  Preferably, the knob body is formed with a hole for communicating the upper surface and the wrench member fixing hole. In this case, the wrench member can be easily removed from the small flag-shaped wrench knob member by inserting a rod into the punch hole and pushing the wrench member out of the wrench member fixing hole.

  Hereinafter, an embodiment in which the present invention is embodied in a small flag wrench will be described in detail with reference to FIGS. FIG. 1 is a perspective view showing a schematic configuration of a small flag wrench, and FIG. 2 is a cross-sectional view of the small flag wrench.

  As shown in FIGS. 1 and 2, the small flag wrench 10 includes a metal wrench member 11 (a wrench member for a small flag wrench) and a composite that is attached to the base end side of the wrench member 11 by a cap method. And a resin knob member 12 (a knob member for a small flag-shaped wrench). The small flag wrench 10 is used for fixing the throw-away tip 3 to the holder 2 of the cutting tool 1 by bolting.

  In the cutting tool 1 of FIG. 1, a tip seat 4 is provided at the tip of the holder 2, and the throw-away tip 3 is fixed to the tip seat 4 by a bolt 5 (fastener). The bolt 5 is a general bolt used to fix the throw-away tip 3, and the wrench recess 7 provided in the head portion 6 has a “*” shape in plan view. .

  The wrench member 11 is a rod-shaped member, and includes a main shaft 15 having an engagement portion 14 at the tip, a short shaft 16 formed by bending the base end of the main shaft 15 at a right angle, and a tip of the short shaft 16 at the tip of the main shaft 15. And a stress dispersion portion 17 that is bent so as to face the same direction as the distal end direction, and the proximal end side is substantially U-shaped. The engaging portion 14 at the tip of the main shaft 15 has a shape that can be engaged with the bolt 5, that is, a “*” shape (gear shape of 6 blades). Moreover, the stress dispersion | distribution part 17 is long in the principal axis direction rather than the diameter of the short axis | shaft 16, and is formed so that it may move away from the main axis | shaft 15 toward the front end side (refer the dashed-two dotted line of FIG. 2).

  As shown in FIGS. 1 to 5, the knob member 12 includes a synthetic resin knob main body 21 having a side surface, an upper surface, and a lower surface, and a knob protrusion 22 integrally formed so as to protrude from the upper surface of the knob main body 21. With. The knob body 21 is formed in a chip shape having a size that can be held and held by an operator with a finger (for example, a vertical and horizontal width of 20 mm and a thickness of 6 mm). Specifically, the knob member 12 is injection molded using a cellulose acetate resin. In the present embodiment, as the cellulose acetate resin, a grade having a Rockwell hardness of 100 on the H scale is used.

Further, a wrench member fixing hole 24 is formed in the lower surface of the knob body 21, and a bent base end side of the wrench member 11 is detachably fitted and fixed to the wrench member fixing hole 24. The wrench member fixing hole 24 has a size that matches the diameter and length of the short shaft 16 of the wrench member 11, and the opening area of the wrench member fixing hole 24 occupying the lower surface of the knob body 21 is 13% or more and 50% or less. Yes, the depth of the wrench member fixing hole 24 with respect to the vertical dimension of the knob body 21 is 40% or more and 90% or less, and the volume of the wrench member fixing hole 24 with respect to the volume of the knob body 21 is 10% or more and 40% or less. (See the shaded area in FIG. 5).
Further, the wrench member fixing hole 24 is configured to include the coaxial position of the knob protrusion 22, and when the proximal end side of the wrench member 11 is attached to the wrench member fixing hole 24, the knob protrusion 22 and the wrench member 11 main shafts 15 are arranged coaxially.

  Further, the knob main body 21 is formed with a punch hole 25 in the vicinity of the knob protrusion 22 on the upper surface for communicating the upper surface with the wrench member fixing hole 24. When the wrench member 11 is removed from the knob member 12, a long and narrow bar is inserted into the hole 25, and the proximal end side of the wrench member 11 is pushed out of the wrench member fixing hole 24.

  A plurality of ribs 26 extending along the vertical direction of the knob member 12 are provided on the side surface of the knob body 21. The plurality of ribs 26 function as a slip stopper when the operator pinches and turns the knob body 21 by hand. In the present embodiment, the rib 26 is not formed in the upper region R1 on the side surface, and characters such as a product name and a company name are written in the region R1. Further, a recess 28 is formed at the center of the side surface of the knob body 21. The recess 28 is sized according to the fingertip of the operator. By providing the recess 28, the knob body 21 can be easily gripped.

  Further, the knob protrusion 22 is also provided with a plurality of ribs 29 extending along the vertical direction of the knob member 12. The plurality of ribs 29 also function as anti-slip when pinching the knob protrusion 22 and turning it.

  Next, the usage method of the small flag wrench 10 of this Embodiment is demonstrated.

  First, the operator prepares the wrench member 11 and the knob member 12, and configures the small flag wrench 10 by fitting and fixing the proximal end side of the wrench member 11 to the wrench member fixing hole 24 of the knob member 12. To do. Here, the stress dispersion portion 17 of the wrench member 11 is formed so as to move away from the main shaft 15 as it goes to the distal end side. When the wrench member 11 is fixed, the distal end side abuts against the wall surface of the wrench member fixing hole 24. The state is stored in the fixing hole 24. Therefore, the wrench member 11 is securely fixed so as not to fall out of the wrench member fixing hole 24 by the stress dispersion portion 17 serving as a spring.

  Next, the operator holds the small flag wrench 10 by holding the knob main body 21 of the knob member 12 with a finger, and engages the engaging portion 14 of the main shaft 15 of the wrench member 11 with the wrench recess 7 of the bolt 5. Let At this time, the throw-away tip 3 is disposed on the tip seat 4 of the holder 2, and the tip of the bolt 5 is inserted into the bolt hole 9 of the tip seat 4 through the through hole 8 of the throw-away tip 3 (see FIG. 1). Then, the bolt 5 is temporarily tightened by turning the knob protrusion 22 of the knob member 12. Here, the bolt 5 is temporarily tightened without requiring a strong force, and the knob protrusion 22 has a small diameter. Therefore, the knob protrusion 22 can be quickly turned for temporary tightening. Further, in the small flag wrench 10, the knob protrusion 22 is disposed on the same axis as the main shaft 15, so that the bolt 5 is temporarily tightened quickly without shaft shake.

  Thereafter, the operator pinches the depression 28 at the center of the side surface of the knob main body 21 with a finger, and turns the knob main body 21 so that the bolt 5 is finally tightened with a predetermined torque. At this time, in the knob body 21, stress is applied to the stress dispersion portion 17 provided at the proximal end side of the wrench member 11 accommodated in the wrench member fixing hole 24, particularly at the distal end of the short shaft 16. The stress dispersion portion 17 is formed longer than the diameter of the short axis 16 in the main axis direction and has a sufficient area, so that the stress is dispersed without being concentrated. As a result, a sufficient tightening torque is ensured without damaging the knob body 21, and the bolt 5 is securely tightened.

  In addition, when the bolt is tightened a plurality of times (for example, about 20 times) using the small flag wrench 10, the engaging portion 14 is deformed by the repeated stress applied to the engaging portion 14 of the wrench member 11, and the bolt tightening is performed. Cannot be performed reliably. In this case, it is necessary to replace the unusable wrench member 11 with a new wrench member 11. At the time of this replacement, a long stick (for example, a metal pin) is inserted into a hole 25 formed on the upper surface of the knob main body 21, and the wrench member 11 is pushed out from the wrench member fixing hole 24. The wrench member 11 is removed. Thereafter, the base end side of the new wrench member 11 is fitted into the wrench member fixing hole 24 and the wrench member 11 is fixed to the knob member 12, whereby the replacement operation of the wrench member 11 is completed.

  Further, when the knob member 12 is damaged instead of the wrench member 11, the wrench member 11 is similarly removed from the knob member 12 by inserting a long and narrow bar into the punch hole 25 of the knob body 21. Thereafter, the base end side of the wrench member 11 is fitted into the wrench member fixing hole 24 of the new knob member 12 and the wrench member 11 is fixed to the knob member 12, whereby the replacement operation of the knob member 12 is completed.

  Therefore, according to the present embodiment, the following effects can be obtained.

  (1) In the small flag wrench 10 of the present embodiment, the wrench member 11 is formed on the proximal end side with a short shaft 16 formed by bending the base end of the main shaft 15 at a right angle and a distal end of the short shaft 16. And a stress distribution portion 17. Since the stress dispersion portion 17 is formed longer in the principal axis direction than the diameter of the short shaft 16, the stress applied to the tip of the short shaft 16 can be reliably dispersed when the bolt 5 is tightened. As a result, damage to the synthetic resin knob body 21 can be avoided, and the bolt 5 can be securely tightened.

  (2) In the small flag-shaped wrench 10 of the present embodiment, the metal wrench member 11 and the synthetic resin knob member 12 have a detachable divided structure. If the member is damaged, the small flag wrench 10 can be reused by replacing the damaged member. Therefore, compared with the conventional wrench 44 in which the wrench member 45 and the knob member 43 are integrally formed as shown in FIG. 14, the component cost can be reduced.

  (3) In the small flag wrench 10 of the present embodiment, the stress dispersion portion 17 is formed by bending the distal end of the short shaft 16 so as to face the same direction as the distal end direction of the main shaft 15, and the proximal end side of the wrench member 11 is substantially the same. It is U-shaped. In this case, the wrench member 11 can be reliably fixed to the knob member 12 as compared with the L-shaped wrench member 47 as in the prior art. In particular, since the stress dispersion portion 17 is formed so as to be farther from the main shaft 15 toward the distal end side, when the proximal end side of the wrench member 11 is fitted into the wrench member fixing hole 24, the stress dispersion portion 17 The wrench member 11 is pressed against the inner wall surface of the wrench member fixing hole, so that the wrench member 11 can be securely fixed without rattling.

  (4) In the knob member 12 of the present embodiment, the opening area of the wrench member fixing hole 24 occupying the lower surface is 40%, the depth of the wrench member fixing hole 24 with respect to the vertical dimension of the knob body 24 is 60%, The volume of the wrench member fixing hole 24 with respect to the volume of the main body 24 is 40% (in the case of the conventional product shown in FIG. 15, the opening area is about 17%, the depth is about 40%, and the volume is about 5%). . Therefore, even when the short axis 16 of the wrench member 11 is lengthened to relieve stress concentration, the short axis 16 can be reliably stored in the wrench member fixing hole 24. In addition, the strength of the knob body 21 is reduced by providing the wrench member fixing hole 24, but the knob body 21 is formed using a cellulose acetate resin having a Rockwell hardness of 100 on the H scale. Therefore, the strength of the knob body 21 can be sufficiently secured (in the case of the conventional product shown in FIGS. 14 and 15, the Rockwell hardness is about 75 to 85 at most on the H scale). Furthermore, cellulose acetate resin is excellent in oil resistance in addition to being excellent in impact resistance. For this reason, even if oil adheres to the hand when adjusting a lathe processing machine or the like, the small flag wrench 10 can be used without worrying about the adhesion of the oil.

  (5) Since the knob member 12 of the present embodiment has a plurality of ribs 26 extending in the vertical direction on the side surface of the knob main body 21, each rib is turned when the operator pinches and turns the knob main body 21 by hand. 26 functions as a slip stopper. Thereby, the small flag-shaped wrench 10 can be rotated reliably and workability | operativity can be improved.

  (6) Since the knob member 12 of the present embodiment has the depression 28 at the center of the side surface of the knob body 21, the knob body 21 can be easily pinched and workability can be improved.

  (7) In the knob member 12 of the present embodiment, the punch hole 25 is formed to allow the upper surface of the knob body 21 and the wrench member fixing hole 24 to communicate with each other. The wrench member 11 can be easily removed from the knob member 12 by inserting a long and narrow bar into the punch hole 25 and pushing the wrench member 11 out of the wrench member fixing hole 24.

  In addition, you may change embodiment of this invention as follows.

  -Although the knob member 12 of the said embodiment was formed with the some rib 26 on the side surface, this rib 26 may be abbreviate | omitted. Further, like the knob member 31 shown in FIG. 6, the entire side surface of the knob body 21 may be formed in a curved concave shape. Even if the knob member 31 is formed in this way, the knob main body 21 can be easily picked, so that the small flag wrench 10 can be reliably rotated.

  The small flag wrench 10 of the above embodiment is a one-flag type wrench with a knob member 12 mounted on one side with respect to the main shaft 15, but in addition to this, both flags with a knob member mounted on both sides of the main shaft 15 It may be embodied in a type of wrench.

  In the wrench member 11 of the above embodiment, the bent shape on the base end side of the main shaft 15 is substantially U-shaped, but may be changed to other shapes such as a Z-shape. Moreover, although the stress dispersion | distribution part 17 was formed by bending the front-end | tip of the short axis | shaft 16, you may crush the front-end | tip of the short axis | shaft 16 besides this, and may form the stress distribution part 17. FIG. 7 to 9 show specific examples of the wrench members 11A, 11B, and 11C in which the bent shape on the base end side of the main shaft 15 is changed.

  In the wrench member 11A of FIG. 7, the bent shape on the base end side of the main shaft 15 is formed in a crank shape. That is, in the wrench member 11A, the short shaft 16 is formed by bending the base end of the main shaft 15 at a right angle, and the stress dispersing portion 17 has the tip of the short shaft 16 in the direction opposite to the tip direction of the main shaft 15 (180 °). It is formed by being bent so as to face the direction of Further, in the wrench member 11B of FIG. 8, the bent shape on the base end side of the main shaft 15 is formed in a Z-shape. That is, in the wrench member 11B, the short shaft 16 is formed by bending the base end of the main shaft 15 at a substantially right angle (specifically, an angle of 70 ° with respect to the main shaft 15). It is formed by bending the tip of the short shaft 16 so as to face the direction opposite to the tip direction of the main shaft 15 (direction of 180 °). Further, in the wrench member 11C of FIG. 9, the short shaft 16 is formed by bending the base end of the main shaft 15 at a right angle, and the stress dispersion portion 17 crushes the tip of the short shaft 16 to double the base end. It is formed by making it thick to the extent (longer in the main axis direction than the diameter of the short axis 16). By forming the stress dispersion portion 17 like the wrench members 11A, 11B, and 11C, the contact area with the knob body 21 is increased in the wrench member fixing hole 24, so that the stress applied to the tip of the short shaft 16 is reliably ensured. Can be dispersed. However, since the contact area with the knob body 21 is larger when the base end side is formed in a substantially U shape like the wrench member 11 of the above-described embodiment, the wrench member 11 is securely fixed. This is practically preferable.

  In the above embodiment, the punch body 25 is formed in the knob body 21 so that the upper surface communicates with the wrench member fixing hole 24, but this may be omitted.

  -You may form the base end side of the main axis | shaft 15 in substantially rectangular loop shape like wrench member 11D shown in FIG. Moreover, you may form the base end side of the main axis | shaft 15 in a substantially triangular loop shape like the wrench member 11E shown in FIG. Or you may form the base end side of the main axis | shaft 15 in a substantially circular loop shape like the wrench member 11F shown in FIG. Even if it is a shape like these, it can be used in combination with the knob member 12 of the said embodiment.

The perspective view which shows the small flag-shaped wrench of this Embodiment. Sectional drawing which shows the small flag-shaped wrench of this Embodiment. The side view which shows the knob member of this Embodiment. Sectional drawing in the AA of FIG. Explanatory drawing which shows the wrench member fixing hole in the lower surface of a knob main body. The perspective view which shows the knob member of another embodiment. Sectional drawing which shows the wrench member of another embodiment. Sectional drawing which shows the wrench member of another embodiment. Sectional drawing which shows the wrench member of another embodiment. Sectional drawing which shows the wrench member of another embodiment. Sectional drawing which shows the wrench member of another embodiment. Sectional drawing which shows the wrench member of another embodiment. The perspective view which shows the conventional wrench. The perspective view which shows the conventional wrench. The perspective view which shows the conventional wrench.

Explanation of symbols

DESCRIPTION OF SYMBOLS 5 ... Bolt as a fastener 10 ... Small flag wrench 11, 11A, 11B, 11C ... Wrench member as wrench member for small flag wrench 12 ... Knob member as knob member for small flag wrench 14 ... Engagement part DESCRIPTION OF SYMBOLS 15 ... Main axis | shaft 16 ... Short axis 17 ... Stress distribution part 21 ... Knob main body 22 ... Knob protrusion 24 ... Wrench member fixing hole 25 ... Extraction hole 26 ... Rib 28 ... Depression 31 ... Knob member

Claims (10)

A main shaft in which an engaging portion capable of engaging with a fastener is formed; a short shaft formed by bending a base end of the main shaft at a right angle; and a diameter of the short shaft formed at a tip of the short shaft in the main shaft direction And a rod-shaped and metal wrench member with a long stress dispersion portion,
A synthetic resin knob body having a side surface, an upper surface, and a lower surface, and having a chip shape that can be held by an operator with a finger, and having a wrench member fixing hole formed in the lower surface, and the knob body A knob member including a knob protrusion integrally formed so as to protrude on the upper surface of
A small flag wrench, wherein a bent base end side of the wrench member is detachably fitted and fixed to the wrench member fixing hole. It is a rod-shaped and metal wrench member that can be detachably fitted and fixed to the bent base end side with respect to the wrench member fixing hole of the small flag wrench knob member,
A main shaft in which an engaging portion capable of engaging with a fastener is formed; a short shaft formed by bending a base end of the main shaft at a right angle; and a diameter of the short shaft formed at a tip of the short shaft in the main shaft direction A small flag wrench wrench member comprising a long stress dispersion portion.   3. The stress dispersion portion is formed by bending the distal end of the short axis so as to face the same direction as the distal end direction of the main shaft, and the proximal end side of the wrench member has a substantially U-shape. Wrench member for small flag wrench as described in 1.   The wrench member for a small flag wrench according to claim 3, wherein the stress dispersion portion is formed so as to be farther from the main shaft toward the tip side. A knob member that can be detachably fitted and fixed to a bent base end side of a metal small flag wrench wrench member,
A synthetic resin knob body having a side surface, an upper surface, and a lower surface, in the shape of a chip that can be held and held by an operator with a finger, and a wrench member fixing hole formed in the lower surface;
A knob protrusion integrally formed so as to protrude from the upper surface of the knob body, and the opening area of the wrench member fixing hole occupying the lower surface is 13% to 50%, and the vertical dimension of the knob body The wrench member fixing hole has a depth of 40% or more and 90% or less, and the volume of the wrench member fixing hole with respect to the volume of the knob body is 10% or more and 40% or less, and the synthetic resin constituting the knob body A small flag-shaped wrench knob member having a Rockwell hardness of 80 or more on the H scale.   6. The small flag wrench knob member according to claim 5, wherein the synthetic resin constituting the knob body is a cellulose acetate resin.   The knob member for a small flag wrench according to claim 5 or 6, wherein the knob body has a plurality of ribs extending along the vertical direction of the knob member on the side surface.   The knob member for a small flag-shaped wrench according to any one of claims 5 to 7, wherein the knob body has a depression in a central portion of the side surface.   The knob member for a small flag wrench according to any one of claims 5 to 8, wherein the knob body is formed in a concave shape in which the entire side surface is curved.   The small knob wrench knob member according to any one of claims 5 to 9, wherein the knob body is formed with a hole for communicating the upper surface with the wrench member fixing hole. .

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