JPH0733562U - Drive structure of ratchet spanner - Google Patents

Abstract

(57) [Summary] [Structure] The drive structure of the ratchet spanner of the present invention is a head, a ring body rotatably attached to the inside of the head, and a ring body 1.
2 includes a bushing that can be fitted in, and the inside of the ring body is provided with a number of convex surfaces having a semicircular cross section on its inner peripheral surface, and all of these convex surfaces project inward. Further, a large number of concave grooves each having a semicircular cross section may be provided on the outer circumference of the bushing to engage with the convex surface. [Effect] When driving, since the convex surface and the concave groove are in contact with each other, the driving force of the spanner is greatly enhanced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a type of ratchet spanner drive structure, and provides a ratchet spanner structure having extremely strong driving force.

[0002]

[Prior art]

 As shown in FIG. 3, a conventional general spanner has a hexagonal engagement surface 43 inside a head 41 thereof, and is structured to engage with a hexagonal outside 51 of the head of a bolt 50.

[0003]

[Problems to be solved by the device]

 Since the conventional spanner makes contact at six points when it is driven, the head of the spanner is extremely likely to be damaged.

[0004]

[Means for Solving the Problems]

 The main purpose of the present invention is to provide a driving structure for a ratchet spanner, which greatly enhances the driving force by the surface contact when driving the ratchet spanner.

[0005]

【Example】

 The structure, characteristics and practical purpose of the present invention will be described in detail below with reference to the drawings. As shown in FIG. 1 and FIG. 2, the ratchet spanner drive structure of the present invention is one in which the handle portion 10 and the head portion 11 are fixed to each other, and the ring body 12 and the head portion 11 are internally rotated. The inner surface of the ring body 12 is attached to the inner peripheral surface 13 thereof, and a number of inner convex surfaces 14 are provided. One groove 15 is provided on each of the inner convex surfaces 14, and since these grooves 15 are on the same line, it is possible to form one annular groove and stop one ring 16. The driven bushing 20 has one cylindrical portion 21, and a plurality of concave grooves 22 having a semicircular cross section are provided on the outer periphery of the cylindrical portion 21 so as to engage with the convex surface 14 and One annular groove 24 is also formed on the outer peripheral surface so that the retaining ring 16 can be fitted therein.

When operating, as shown in FIG. 2, since the contact between the convex surface 14 and the concave groove 22 is a surface contact, the force of the wrench head 11 is effectively transmitted to the bushing 20 and a strong wrench. Exert the effect of.

[0007]

[Effect of device]

 As described above, the driving structure of this type of ratchet spanner greatly enhances the driving force because a kind of surface contact is made during driving.

[Brief description of drawings]

FIG. 1 is a three-dimensional exploded view of a drive structure of a ratchet spanner of the present invention.

FIG. 2 is a plane operation diagram of the present invention.

FIG. 3 is a plan operation diagram of a conventional ratchet spanner.

[Explanation of symbols]

 10 Handle part 11 Head part 12 Ring body 13 Inner peripheral surface 14 Inner convex surface 15 Groove 16 Ring 20 Bushing 21 Cylindrical part 22 Recessed groove 24 Annular groove

Claims (2)

[Scope of utility model registration request] 1. A head 11, a ring body 12 rotatably attached to the inside of the head 11, and a bushing fitted in the ring body 12 are provided. A convex surface 14 having a semicircular cross section is provided, and each of these convex surfaces projects inward. Also, a large number of concave grooves 22 having a semicircular cross section are provided on the outer periphery of the bushing 21 so that they can be engaged with the convex surface 14. The ratchet spanner drive structure is characterized in that the convex surface 14 and the concave groove 22 are in contact with each other when driven, so that the driving force of the spanner is greatly enhanced. 2. The convex surface is provided with grooves 15 respectively, and these grooves form one annular groove, and also the outer periphery of the bushing 21 is formed with one annular groove 24, and the retaining ring 16 is fitted into these annular grooves. The drive structure for the ratchet spanner according to claim 1, wherein the bushing is firmly held in the head by being collapsed.