CN2936587Y

CN2936587Y - Ratchet spanner

Info

Publication number: CN2936587Y
Application number: CN 200620105413
Authority: CN
Inventors: 李正武
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-07-06
Filing date: 2006-07-06
Publication date: 2007-08-22
Anticipated expiration: 2016-07-06

Abstract

The utility model discloses a ratchet wrench, which is improved on the basis of the original wrench body with a through hole and an allowance chamber as well as an annular ratchet wheel arranged in the through hole and a pallet and an elastic part in the allowance chamber, wherein, the allowance chamber is a circular groove formed by a hollow on the internal wall of the through hole and the inner side surface of the pallet comprises a first cambered surface adjacent to a head and a second cambered surface adjacent to a tail, the radius of the first cambered surface is less than the radius of the second cambered surface and identical to the radius of the circular groove. When the pallet of the second cambered surface is close stuck with the internal wall of the circular groove, the teeth on the lateral surface of the pallet can naturally leave a ratchet wheel and only a small amount of teeth on the head end can be contacted with the ratchet, so the structure can effectively diminish the wear between the ratchet wheel and the pallet when the wrench is in a back turn, greatly decreasing the working noise and being convenient for machining the circular groove, thus, the utility model has the advantages of simpler and more rational structure, a long performance period of usage and easy operation, so the utility model is worthy of popularization and application in the existing market.

Description

Ratchet spanner

Technical field

The utility model relates to a kind of hand-operated tools, specifically refers to a kind of plum blossom ratchet spanner.

Background technology

Owing to ratchet spanner can fast rapid-result ground rotating nut or bolt be widely used in each occasion.And in order to satisfy the demand in market, people have also designed ratchet spanner miscellaneous already, as Chinese publication number is a kind of ratchet spanner " a kind of spanner of ratchet-driven tool and have the ratchet-driven tool of this spanner " of CN1473688A just disclosed, it comprises Wrench head and shank and is arranged in the through hole of Wrench head and is installed in the annular ratchet of this through hole rotationally, the interior perimeter surface of this annular ratchet is designed to the shape that is complementary with fixture, and design has ratchet on its outer surface.On Wrench head, also be provided with simultaneously oblique room, one end and the above-mentioned through hole of this oblique room connect, the other end then is exposed to the side-walls of Wrench head, in this oblique room, be placed with ratchet, spring and plug, one side of this ratchet is provided with a plurality of teeth that are meshed with ratchet, and its afterbody offsets by spring and plug.During use, when the spanner shank rotates forward or backwards, make ratchet be subjected to the thrust of different directions side and be engagement or the state that skids with ratchet.Therefore, adopt such structure, just can realize screwing or unscrewing of bolt (or nut) apace.But after its structural analysis as can be known: because this room is that oblique direct boring forms, so behind the ratchet pressurized, can only move along room wall straight line.Like this when ratchet and ratchet are in slipping state, the tooth on the ratchet lateral surface all contacts with ratchet on the ratchet to some extent.That is to say that the tooth on the ratchet all rubs mutually with ratchet.Obviously, the resistance when such structure had both increased the spanner counter-rotating makes in the operating process noise big, poor working environment; Simultaneously the wearing and tearing of ratchet and pawl have been accelerated again, to such an extent as to shortened the service life of spanner widely.And process such inclined hole, and location difficulty, mismachining tolerance can't be guaranteed crudy greatly.Therefore existing this ratchet spanner awaits further to improve.

Summary of the invention

Technical problem to be solved in the utility model is at above-mentioned prior art present situation, provides that a kind of noise is little, the ratchet spanner of the light and long service life of operation.

The utility model solves the problems of the technologies described above the technical scheme that is adopted: this ratchet spanner comprises wrench body, be opened in the through hole of body head and be installed in annular ratchet in this through hole rotationally, design has ratchet on the outer surface of described ratchet, the room that connects at the setting of described body head and above-mentioned through hole, the elastic component that in this room, is mounted with ratchet and offsets with the ratchet afterbody, and the tooth that design has a plurality of and above-mentioned ratchet to be meshed on the lateral surface of this ratchet, it is characterized in that: described room is the circular groove that is caved inward and formed by described through-hole wall, and the medial surface of described ratchet is made up of first cambered surface that is adjacent to its head and second cambered surface that is adjacent to its afterbody, the radius of this first cambered surface is less than the radius of second cambered surface, and be equal to the radius of described circular groove, and under nature, described second cambered surface is close to mutually with described circular groove inwall.

As further improvement of the utility model, described elastic component can be U type spring for one, the base of this U type spring and the afterbody of described ratchet offset, its two free end is bent into a flanging respectively, and is respectively arranged with the axis hole of pegging graft for above-mentioned each flanging on the described circular groove madial wall.Adopt such structure, both located reliably, can assist ratchet and ratchet to realize engagement or the action of sliding again neatly.Certainly, this elastic component also can adopt conventional spiral spring, and an end of this spring can be positioned on the reference column of circular groove, and the other end then is butted in the blind hole of ratchet afterbody, and therefore, such spring can be realized above-mentioned functions equally.

Described ratchet afterbody can also be provided with the locating slot that is complementary with described U type spring base, and it is more reliable and more stable to work together like this.

Compared with prior art, because ratchet medial surface of the present utility model is designed to two cambered surfaces of different radii, therefore, when second cambered surface is close to mutually with the circular groove inwall, tooth on the ratchet lateral surface leaves ratchet naturally, and only stays a small amount of tooth of its head to contact with ratchet on the ratchet, therefore such structure, reduce the wearing and tearing between ratchet and ratchet on the one hand effectively, thus the service life of having improved spanner; Then reduced operating noise on the other hand, made to operate easily, increase work efficiency flexibly.Simultaneously can also process circular groove easily, thereby the utility model structure is simpler, reasonable, practical, so be worth on the existing market, applying.

Description of drawings

Fig. 1 is the profile schematic diagram of the utility model embodiment;

Fig. 2 is the upright figure decomposing schematic representation of Fig. 1;

Fig. 3 is the cutaway view of through hole among Fig. 1;

Fig. 4 is the structural representation of the utility model embodiment when work;

Fig. 5 is the structural representation of the utility model embodiment when oppositely skidding.

The specific embodiment

Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.

As depicted in figs. 1 and 2, this ratchet spanner comprises wrench body 1, annular ratchet 2, ratchet 3 and elastic component, wherein wrench body 1 is made up of body head 11 and shank 12, be processed with a through hole 13 at body head 11, above-mentioned ratchet 2 is installed in the through hole, the interior perimeter surface of this ratchet is provided with the shape that is complementary with fixture, and is provided with ratchet 21 on its outer surface.In order to prevent that annular ratchet from deviating from from through hole 13, be adjacent at above-mentioned through hole on the inwall of root edge and be processed with cannelure 14, accordingly, also be provided with an annular spacing groove 22 at the ratchet outer surface.During installation, C shape snap ring 5 is placed in the stopper slot 22 of ratchet, again ratchet is buckled in the through hole, C shape snap ring is placed in the cavity that annular spacing groove 22 and cannelure 14 surrounded, thereby realized the working method that ratchet 2 rotates with respect to through hole 13.

Simultaneously, a circular groove 15 has also caved inward on above-mentioned through-hole wall, as shown in Figure 3, in this circular groove, be mounted with above-mentioned ratchet 3 and elastic component, the tooth that design has a plurality of and above-mentioned ratchet 21 to be meshed on the lateral surface of ratchet 3, and its medial surface is made up of first cambered surface 31 that is adjacent to its head and second cambered surface 32 that is adjacent to its afterbody, and the radius of first cambered surface 31 is less than the radius of second cambered surface 32, and is equal to the radius of circular groove 15.Under nature, second cambered surface 32 of ratchet is close to mutually with the inwall of circular groove 15.Here, above-mentioned elastic component is designed to U type spring 4, and the base 41 of this U type spring offsets with the afterbody of ratchet 3, and its two free end is bent into a flanging 42 respectively, is respectively arranged with the axis hole 16 corresponding to each flanging on the madial wall of circular groove.During work, each flanging 42 is inserted in separately the axis hole 16, U type spring 4 can be rotated, around axis hole 16 to cooperate the work of ratchet and ratchet.Reliably offset for the base that makes U type spring and the afterbody of ratchet simultaneously, in the present embodiment, also the afterbody at ratchet 3 is provided with the locating slot 33 that is complementary with U type spring base.

When needing the rotation nut, then clockwise rotate spanner shank 12, as shown in Figure 4, at this moment, second cambered surface of ratchet medial surface is subjected to the compressing power of circular groove inwall, and the ratchet afterbody is rotated to the ratchet side.At this moment, second cambered surface of ratchet is left the circular groove inwall, and first cambered surface of ratchet is then pressed close to its corresponding circular groove inwall gradually.Be close to mutually with the circular groove inwall when first cambered surface and do not have the space when removable, the tooth on the ratchet lateral surface also is meshed with ratchet just.Otherwise, when rotating counterclockwise the spanner shank, as shown in Figure 5, removed above-mentioned compressing power on first cambered surface of ratchet, and under the effect of the promotion of ratchet and U type spring restoring force, the ratchet afterbody is rotated counterclockwise, paste mutually with the circular groove inwall again until its second cambered surface.At this moment, only have tooth of head and ratchet inconsistent on the lateral surface of ratchet, all the other teeth all are separated with ratchet.Therefore, the frictional force when this ratchet spanner has reduced ratchet and ratchet widely and skids, and have that noise is low, wearing and tearing are little, operation easily, flexible characteristic, thereby more can satisfy people's instructions for use.

Claims

1, a kind of ratchet spanner, it comprises wrench body (1), be opened in the through hole (13) of body head and be installed in annular ratchet (2) in this through hole rotationally, design has ratchet (21) on the outer surface of described ratchet, the room that connects at the setting of described body head and above-mentioned through hole, the elastic component that in this room, is mounted with ratchet (3) and offsets with the ratchet afterbody, and the tooth that design has a plurality of and above-mentioned ratchet to be meshed on the lateral surface of this ratchet, it is characterized in that: described room is the circular groove (15) that is caved inward and formed by described through hole (13) inwall, and the medial surface of described ratchet is made up of first cambered surface (31) that is adjacent to its head and second cambered surface (32) that is adjacent to its afterbody, the radius of this first cambered surface is less than the radius of second cambered surface, and be equal to the radius of described circular groove, and under nature, described second cambered surface is close to mutually with described circular groove inwall.

2, ratchet spanner according to claim 1, it is characterized in that: described elastic component is a U type spring (4), the base (41) of this U type spring offsets with the afterbody of described ratchet, its two free end is bent into a flanging (42) respectively, and is respectively arranged with the axis hole (16) of pegging graft for above-mentioned each flanging on the described circular groove madial wall.

3, ratchet spanner according to claim 2 is characterized in that: described ratchet (3) afterbody also is provided with the locating slot (33) that is complementary with described U type spring base.