JP5203471B2 - Hose clamp - Google Patents

Description

  The present invention relates to, for example, a hose clamp used when connecting internal pipes for automobiles using a hose.

  Conventionally, when connecting pipes used as internal piping for automobiles, a flexible hose is put on the outer periphery of the end of the pipe, and the hose is fixed to the pipe by tightening the outer periphery of the hose with a hose clamp. The method is widely used.

  As the hose clamp, Patent Document 1 below has an annular leaf spring body, a slit and a first knob piece are formed at one end of the leaf spring body, and an insertion piece at the other end of the leaf spring body. And a second knob piece is formed, and the leaf spring body is configured to expand in diameter by bringing both knob pieces close to each other. The first knob piece extends toward the second knob piece, and A hook-like locking piece that extends in the width direction of the leaf spring body and engages the opposite surface of the second knob piece to the opposite surface of the first knob piece is formed on the second knob piece. An operation piece located on the upper side of the locking piece and extending in the width direction of the leaf spring main body is formed, and a stopper portion for holding the engagement state between the second knob piece and the locking piece is formed. The locking piece is in a free state in which the leaf spring body has a reduced diameter, and is opposed to the stopper portion. Deviation in the width direction Te, hose clamps is disclosed formed at a position not overlapping when viewed in the circumferential direction.

  When both the tab pieces are brought close to each other and when the locking piece is moved in the width direction and engaged with the second tab piece, the engagement state is maintained by the stopper portion, and the leaf spring body is maintained in an expanded state. Is done. In this state, both the knob pieces are close to each other, and the operation piece is disposed above the locking piece.

  Therefore, both knob pieces are picked up with a tool to make them closer to each other, one end of the operation piece and the other end of the first knob piece are sandwiched with a tool, or the locking piece and the operation piece are separated with a tool. The leaf spring body can be elastically reduced in diameter and the hose can be tightened and fixed by shifting the locking piece with respect to the second knob piece by various methods.

Further, Patent Document 2 below includes a C-shaped clamping ring and a pair of grips that intersect with both ends of the clamping ring and rise in the radial direction. The other grip has a narrow dimension that can move in the guide groove, and the hose can be tightened when the diameter of the fastening ring is reduced in a free state. When the pair of grips are brought close to each other, the fastening ring is configured to expand the diameter, and a locking portion for releasably locking the other grip to the groove edge near the one grip of the guide groove is provided. There is disclosed a hose clamp that is provided and provided with a guide portion that guides the other grip in the opening direction of the guide groove at the groove edge of the guide groove that continues from the locking portion.
International Publication No. 07/108155 Pamphlet JP 2001-159491 A

  In the case of the hose clamp of the above-mentioned Patent Document 1, the hook-shaped locking piece extending from the first tab piece is turned around the opposite surface of the second tab piece to the opposite surface of the first tab piece, Since it is engaged, the front-end | tip part of the latching piece is the state which protruded in the circumferential direction outward rather than the opposite surface of the 2nd knob piece.

  The hose clamp can release the engagement between the locking piece on the first knob piece side and the second knob piece by a plurality of methods. There was a problem. That is, since the front end of the locking piece protrudes outward in the circumferential direction from the opposite surface of the second knob piece, the first and first knob pieces are mistakenly taken when attempting to pick both the knob pieces. The first and second tab pieces cannot be brought close to each other by pinching the tip of the locking piece extending from the hook, and the engagement between the locking piece and the second tab piece cannot be released. There was a thing.

  On the other hand, in the hose clamp described in Patent Document 2, a guide groove is formed in the tightening ring, and a locking portion is provided on a groove edge near one grip of the guide groove so as to detachably engage the other grip. ing. When the diameter of the tightening ring is increased, the other grip is engaged with the engaging portion of one grip, and when the diameter of the tightening ring is reduced, the engaging portion is One of the grips provided is slightly raised outward in the radial direction. As a result, when the diameter of the tightening ring is reduced and the hose is fastened and fixed, the inner periphery of the tightening ring is not in close contact with the entire circumference of the hose, and thus the sealability between the pipe and the hose may be insufficient.

  Accordingly, an object of the present invention is to provide a hose clamp that can securely pinch and release the first tab piece and the second tab piece, and can be tightened and fixed in a state of being in close contact with the outer periphery of the hose. Is to provide.

In order to achieve the above object, a first aspect of the present invention includes a leaf spring body formed by being annularly curved,
A slit formed along the circumferential direction and a first tab piece protruding radially outward are formed at one end of the leaf spring main body,
The other end of the leaf spring body is inserted into the slit, and is inserted into the slit so as to be slidable in the circumferential direction, and protrudes radially outward from the end of the insertion piece, A second tab piece disposed opposite the first tab piece is formed;
In a hose clamp configured such that when the first tab piece and the second tab piece are brought close to each other from a free state in which the leaf spring body is reduced in diameter, the leaf spring body expands against its elastic force. ,
The first tab piece extends toward the second tab piece and extends in the width direction of the leaf spring body, and is opposite to a surface of the second tab piece facing the first tab piece. A hook-shaped locking piece that can be engaged with the side surface is formed,
In the second knob piece, a stopper portion is formed on the surface opposite to the surface facing the first knob piece to hold the state when the locking piece is engaged,
The locking portion of the locking piece is formed in a position where the leaf spring body is in a free state where the diameter of the leaf spring is reduced, is shifted in the width direction with respect to the stopper portion, and does not overlap when viewed along the circumferential direction. And
The locking piece extends substantially along the circumferential direction of the leaf spring body, and a tip portion of the locking piece is curved radially inward of the leaf spring body. Is.

  According to the invention, the first tab piece and the second tab piece are brought close to each other against the elastic force from the free state in which the leaf spring main body has a reduced diameter, and the locking piece is moved in the width direction to bring the second tab piece. When engaged with the opposite surface, the engaged state is held by the stopper portion, and the both ends of the leaf spring main body are bent in the width direction and can be maintained in an expanded state.

  In this state, a hose clamp is arranged on the outer periphery of the hose covered with a pipe or the like, and the first and second tab pieces are picked and brought close to each other with a tool such as a pliers or a pliers, and the locking piece is set to the second position. When the engagement and retention by the stopper is released by shifting in the circumferential direction from the opposite surface of the tab piece, both ends of the leaf spring body bent in the width direction return to their original positions, and the locking piece and the second tab piece Is in a position where does not engage. In this state, when the tool is gradually opened and the first and second knob pieces are spread apart, the insertion piece slides in the slit due to the elastic restoring force of the leaf spring body, and the leaf spring body contracts. Since the diameter is increased, the hose can be fastened and fixed to a pipe or the like.

  And in this invention, the latching piece engaged with a 2nd knob piece extends along the circumferential direction of a leaf | plate spring main body substantially, and the front-end | tip part curves toward the radial inside of a leaf | plate spring main body. Therefore, when the first knob piece and the second knob piece are picked and brought close to each other with a tool such as pliers or pliers, even if the tool picks up the first knob piece and the tip of the locking piece. It can move to the second tab piece without being caught by the front end of the locking piece, and the first tab piece and the second tab piece can be reliably picked and released from the engagement.

  In addition, since the locking piece extends from the first tab piece protruding radially outward of the leaf spring body, the inner circumference of the leaf spring body is brought into close contact with the entire circumference of the hose to be tightened, The hose can be fastened to a pipe or the like, and the sealing performance of the hose connected to the pipe or the like can be improved.

  In addition, the locking piece extends along the circumferential direction of the leaf spring main body, in other words, substantially parallel to the leaf spring main body until reaching the tip portion thereof, so that the second tab piece is connected to the first tab piece. The locking portion of the locking piece can be brought into contact with the surface opposite to the opposing surface at an angle substantially perpendicular, and the engaging force with respect to the second knob piece can be increased.

  Furthermore, since the locking portion of the locking piece abuts on the opposite surface of the second knob piece at an angle substantially perpendicular to the second knob piece, even if the locking piece is engaged with the second knob piece, Since the circularity is prevented from collapsing and the inner diameter of the hose clamp is secured large, when placing the hose clamp on the outer periphery of the hose, extrapolating the hose to the end of the pipe and moving the hose clamp to the position to be tightened, The portion where the hose is raised by the annular rib (bulge portion) provided on the outer periphery of the end portion of the pipe can be easily passed.

  On the other hand, the locking piece extends diagonally inward in the radial direction of the leaf spring body from the first tab piece, and is opposite to the surface of the second tab piece facing the first tab piece. When the engaging piece is engaged with the second knob piece, the engaging force of the engaging piece with respect to the second knob piece acts diagonally, and the second knob piece There is a tendency that the roundness of the hose clamp is broken by being pushed to the outer diameter side. For this reason, when hose clamps are arranged on the outer periphery of the hose, the hose is extrapolated to the end of the pipe, and the hose clamp is moved to the position to be tightened, the annular rib (bulge) provided on the outer periphery of the end of the pipe The hose may not pass through the raised part.

  According to a second aspect of the present invention, in the first aspect of the present invention, the base side of the locking piece has a tapered shape extending in the width direction toward the second tab piece side, and the first tab and the second tab A hose configured to move in the width direction so that the second tab piece comes into contact with the base side spreading in the width direction of the locking piece and moves away from the locking piece when the piece is brought close to each other A clamp is provided.

  According to the above invention, when the first tab piece and the second tab piece are brought close to each other, the second tab piece comes into contact with the base side spreading in the width direction of the locking piece and is separated from the locking piece. Thus, the second tab piece can be reliably moved to a position where it does not interfere with the locking piece of the first tab piece.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the most distal end portion of the locking piece has a notched side edge on the locking portion side, and the portion provided with the locking portion A hose clamp formed narrower than the above is provided.

  According to the above invention, the engagement between the locking piece and the second tab piece is released, and the insertion piece slides in the slit by the elastic restoring force of the leaf spring body, so that the leaf spring body is reduced in diameter. At this time, it is possible to prevent the leading end portion of the locking piece from interfering with the second tab piece sliding in the slit, and to smoothly reduce the diameter of the leaf spring body.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the most distal portion of the locking piece is directed into a slit at an end of the leaf spring body on the first knob piece side. The hose clamp is provided so as to be curved so as to be positioned at substantially the same position as the outer peripheral surface of the leaf spring body surrounding the slit or radially inward of the leaf spring body from that position.

  According to the above invention, the most distal end portion of the locking piece is formed so as to be located at substantially the same position as the outer peripheral surface of the leaf spring body or radially inward of the leaf spring body from that position. When the first tab piece and the second tab piece are picked up and brought close to each other with a tool such as a pliers or pliers, the tool can be less likely to be caught by the tip of the locking piece.

  According to the present invention, the locking piece that engages with the second knob piece extends substantially along the circumferential direction of the leaf spring body, and its tip end is curved inward in the radial direction of the leaf spring body. Therefore, when the first tab piece and the second tab piece are picked and brought close to each other with a tool, the tool is moved to the second tab piece without being caught by the tip of the locking piece, and the first tab piece and the second tab piece are moved. Engagement can be released by reliably pinching the knob piece.

  In addition, since the locking piece extends from the first tab piece that protrudes radially outward of the leaf spring body, the inner circumference of the leaf spring body is firmly in contact with the entire circumference of the hose, and the hose is connected to a pipe or the like. The hose connected to the pipe or the like can be improved.

1 shows an embodiment of a hose clamp of the present invention, and is a perspective view in an expanded state. FIG. It is a perspective view which shows the state which made the 1st tab piece and the 2nd tab piece approach in the hose clamp. It is a perspective view in the state where the diameter of the hose clamp was reduced. It is explanatory drawing which shows the state which expand | deployed the hose clamp in planar shape. It is a principal part expansion perspective view of the hose clamp. It is a principal part expanded sectional view of the hose clamp. It is a front view in the state where the diameter of the hose clamp was expanded. It is a rear view in the state where the diameter of the hose clamp was expanded. It is a top view in the state where the diameter of the hose clamp was expanded. It is a bottom view in the state where the diameter of the hose clamp was expanded. It is a right view in the state where the diameter of the hose clamp was expanded. It is a left view in the state where the diameter of the hose clamp was expanded. It is sectional drawing in the AA arrow line of FIG.

10 Hose clamp (clamp)
12 Leaf spring body 16 Slit 20 First knob piece 22 Locking piece 25 Front end portion 25a Most advanced portion 27a Locking portion 27b Side edge 29 Inserting piece 30 Second knob piece 32 Concave groove (stopper portion)

  Hereinafter, with reference to FIGS. 1-13, one Embodiment of the hose clamp of this invention is described. In addition, in FIGS. 7-13, the characteristic part of this embodiment is shown with the continuous line. If the application is changed to a design application, the part indicated by the solid line is the part that is about to receive design registration as a partial design, and the alternate long and short dash lines shown in FIGS. 7 to 9 and FIGS. This is a line that indicates only the boundary between the part to be registered for design and the other part.

  For example, various pipes are arranged inside an automobile or the like, and a flexible hose made of a material such as rubber is used to connect these pipes. As shown in FIGS. 1 to 3, the hose clamp 10 of the present invention (hereinafter referred to as “clamp 10”) is disposed on the outer periphery of a hose H that covers one end of a pipe P such as a pipe or tube, This is used for fastening the hose H to the pipe P by tightening the outer periphery of the hose H.

  As shown in FIGS. 1 to 4, the clamp 10 in this embodiment is formed by punching and bending a band-shaped metal plate into a predetermined shape (see FIG. 4), and is a plate formed by being annularly curved. The spring main body 12 is provided, a first knob piece 20 is formed at one end thereof, and a second knob piece 30 is formed at the other end thereof. In the free state, the leaf spring main body 12 is in a state where the first tab piece 20 and the second tab piece 30 are separated from each other in the circumferential direction (see FIG. 3), and resists the elastic force of the leaf spring body 12. When the first tab piece 20 and the second tab piece 30 are brought close to each other, the diameter is increased (see FIG. 1). A plurality of long holes 14 are provided in an intermediate portion in the circumferential direction of the leaf spring body 12. The elongated holes 14 make the stress distribution of the leaf spring body 12 uniform.

  Hereinafter, the shape of the both ends of the leaf spring body 12 will be described in more detail. A slit 16 is formed at one end of the leaf spring body 12 with a predetermined length along the circumferential direction. And the one end part of the leaf | plate spring main body 12 is bend | folded by the front end side of the said slit 16, and it protrudes to radial direction outward, and the 1st knob piece 20 which makes | forms an arch shape is formed. 4 and 11 together, both inner edges 16a, 16a of the slit 16 have a tapered shape that gradually becomes wider toward one end of the leaf spring body 12. As shown in FIG. As a result, a later-described insertion piece 29 at the other end of the leaf spring body 12 is easily inserted into the slit 16.

  The first tab piece 20 extends toward the second tab piece 30 and extends in the width direction of the leaf spring main body 12, and a surface of the second tab piece 30 facing the first tab piece 20. A hook-shaped locking piece 22 that can be engaged with the opposite surface is formed. The locking piece 22 will be described with reference to FIGS.

  As shown in FIG. 5, the locking piece 22 includes both side portions of the slit 16 along the circumferential direction of the leaf spring main body 12 from the upper wall portion 21 of the first tab piece 20 toward the second tab piece 30. The base 23 extends substantially in parallel, and the front end 25 is curved from the front end of the base 23 toward the inside in the radial direction of the leaf spring body 12.

  The base portion 23 includes a root portion 23a extending from a lower edge on one side in the width direction of the upper wall portion 21, and an arm portion 23b extending linearly from the one side in the width direction of the root portion 23a. Have. A taper portion 23c that extends in the width direction toward the first tab piece 20 is formed on the side edge of the root portion 23a on the center side in the width direction of the leaf spring body 12 (see FIGS. 4, 5, and 9). ). 1 and 5, when the first tab piece 20 and the second tab piece 30 are brought close to each other, the second tab piece 30 is brought into contact with the taper portion 23c to lock the taper portion 23c. It plays a role of facilitating movement in the width direction away from the piece 22.

  On the other hand, as shown in FIG. 5, the tip 25 extends from the tip of the arm 23 b of the base 23 so as to curve inward in the radial direction of the leaf spring body 12. The part 25a has an arcuate round shape. As shown in FIG. 6, the forefront portion 25 a faces the slit 16 at the end of the leaf spring body 12 on the first knob piece 20 side, and the outer peripheral surface of the leaf spring body 12 surrounding the slit 16. Curved so as to enter the slit 16 at substantially the same position or radially inward of the leaf spring body 12 from the outer peripheral surface.

  A hook portion 27 that protrudes in the width direction of the leaf spring main body 12 toward the inside of the slit 16 is formed on one side portion of the distal end portion 25. The hook portion 27 has a tip protruding toward the first tab piece 20 to form a locking portion 27a. And the latching | locking part 27a is engaged with the ditch | groove 32 mentioned later formed in the surface opposite to the opposing surface of the 1st tab piece 20 in the 2nd tab piece 30. FIG.

  Furthermore, the most distal end portion 25a of the locking piece 25 is narrowed by cutting out the side edge 25b on the locking portion 27a side. In this embodiment, it is notched in a tapered shape that gradually narrows from the hook portion 27 toward the most distal portion 25a. Since the leading edge 25a of the locking piece 25 is narrow as described above, the leading edge 25a of the locking piece 25 does not interfere with the insertion piece 29 when the leaf spring body 12 is reduced in diameter. It is like that.

  On the other hand, the other end of the leaf spring body 12 is inserted into the slit 16 and an insertion piece 29 that slides in the slit 16 in the circumferential direction when the leaf spring body 12 is expanded or contracted in diameter. Is formed. As shown in FIGS. 4 and 5, the portion slightly forward from the tip of the insertion piece 29 has a side portion 29 a that faces the locking piece 25 on the center line C (see FIG. 4) of the leaf spring body 12. Notched to close position. The end including the one side portion 29a of the insertion piece 29 is bent outward in the radial direction of the leaf spring body 12 to form a second knob piece 30. The second knob piece 30 Is disposed opposite to the first tab piece 20.

  Further, a protruding piece 31 protrudes from the protruding tip of the second knob piece 30 toward one side in the width direction of the leaf spring body 12 (direction approaching the locking piece 22). The second knob piece 30 can be easily picked with the tool.

  As shown in FIGS. 2, 5, and 6, the surface of the second tab piece 30 opposite to the surface facing the first tab piece 20 (hereinafter referred to as “the outer surface of the second tab piece 30”) A concave groove 32 is formed at a predetermined depth in the thickness direction of the second tab piece 30. The engaging portion 27a of the engaging piece 22 is engaged with the peripheral edge of the concave groove 32 and the engaged state is maintained. That is, in this embodiment, the concave groove 32 forms a stopper portion in the present invention. The stopper portion is not limited to the concave groove shape, and may be a protrusion shape or the like that restricts the movement of the locking portion 27a. I just need it.

  Then, in a free state in which the leaf spring body 12 has a reduced diameter, the locking portion 27a of the locking piece 22 provided on the first tab piece 20 and the concave groove 32 of the second tab piece 30 are displaced in the width direction. And formed at a position that does not overlap when viewed along the circumferential direction. Therefore, when engaging the locking portion 27 a with the groove 32, the leaf spring is arranged so that the first tab piece 20 and the second tab piece 30 are brought close to each other and the locking portion 27 a is aligned with the groove 32. The main body 12 is bent and engaged in the width direction. In addition, when the first tab piece 20 and the second tab piece 30 are brought close to each other and the engagement is released in a state where the locking portion 27 a is engaged with the concave groove 32, the flexure is caused by the elastic force of the leaf spring body 12. When the first knob piece 20 and the second knob piece 30 are opened as they are, the locking portion 27a and the concave groove 32 are not overlapped when viewed along the circumferential direction. The insert piece 29 slides so that the leaf spring body 12 can be reduced in diameter.

  Next, a procedure for fastening and fixing the hose H to the pipe P using the clamp 10 having the above-described configuration will be described.

  As shown in FIG. 3, the first tab piece 20 and the second tab piece 30 are separated from the first tab piece 20 and the second tab piece 30 and the leaf spring body 12 is reduced in diameter in a free state. It is picked by a tool such as pliers or pliers and is sandwiched in the circumferential direction against the elastic restoring force of the leaf spring body 12. Then, the distal end portion 25 of the locking piece 22 protrudes to the back side of the second tab piece 30 as viewed from the first tab piece 20, and the leaf spring so that the locking portion 27 a is aligned with the concave groove 32. The main body 12 is bent in the width direction, and the locking portion 27 a is engaged with the concave groove 32. As a result, the engagement state of the locking portion 27a is held by the concave groove 32 forming the stopper portion, and the leaf spring body 12 can be maintained in an expanded state (see FIG. 1).

  In this state, the clamp 10 is disposed on the outer periphery of the hose H attached to the outer periphery of one end of the pipe P. Then, the first tab piece 20 and the second tab piece 30 of the clamp 10 whose diameter has been increased are picked and brought close to each other with a tool T such as a pliers or pliers. At this time, the locking piece 22 is moved to the second tab piece 30. , The first knob piece 20 and the distal end portion 25 of the locking piece 22 may be picked by the tool T in some cases.

  In the clamp 10 of the present invention, the locking piece 22 extends substantially along the circumferential direction of the leaf spring main body 12, and the distal end portion 25 is curved inward in the radial direction of the leaf spring main body 12. ing. Therefore, as shown by an imaginary line in FIG. 6, even if the tool T picks up the first tab piece 20 and the distal end portion 25 of the locking piece 22, one of the distal ends of the tool T is locked to the locking piece 22. The first tab piece 20 and the second tab piece 30 can be reliably picked as shown by the solid line in FIG. The release operation can be performed smoothly.

  By the way, the locking piece 22 formed on the clamp 10 does not have a structure extending obliquely downward from the predetermined position of the first tab piece 20 toward the outer peripheral surface of the leaf spring body 12, but as described above. It has a portion extending substantially along the circumferential direction of the main body 12, and the distal end portion 25 is curved inward in the radial direction of the leaf spring main body 12.

  As described above, the locking piece 22 in the clamp 10 has a portion extending along the circumferential direction of the leaf spring body 12, so that the locking piece 22 is perpendicular to the back surface of the second knob piece 30. It can be engaged at a close angle (see FIG. 6). As a result, it is possible to prevent the locking portion 27a from hitting the back surface of the second tab piece 30 and slipping in the radial direction, and to firmly engage the locking portion 27a with the concave groove 32 of the second tab piece 30. The leaf spring body 12 can be maintained in an expanded state.

  Further, the distal end portion 25 of the locking piece 22 curved inward in the radial direction of the leaf spring main body 12 has a gentle arc-shaped curved surface on the outer surface (see FIG. 6). Therefore, as described above, the tip of the tool T moved to the outer surface side of the locking piece 22 without being caught by the leading end 25 of the locking piece 22 can be smoothly guided to the second knob piece 30.

  Furthermore, in this embodiment, as shown in FIG. 6, the most distal end portion 25 a of the locking piece 22 is directed toward the inside of the slit 16 at the end of the leaf spring body 12 on the first knob piece 20 side. Is curved so as to be located radially inward of the leaf spring body 12 with respect to the outer peripheral surface of the leaf spring body 12 surrounding the leaf spring body 12. Therefore, as described above, when the first knob piece 20 and the second knob piece 30 are picked and brought close to each other with the tool T, the tool T can be prevented from being caught by the distal end portion 25 of the locking piece 22, and more reliably. In addition, both the first tab piece 20 and the second tab piece 30 can be picked.

  Then, after firmly holding both the tab pieces 20 and 30 as described above, when the two pieces are brought closer to each other, the locking portion 27a of the locking piece 22 is disengaged from the concave groove 32, and the locking piece 22 and The engagement with the second knob piece 30 is released. Further, when the first tab piece 20 and the second tab piece 30 are brought closer to each other, the second tab piece 30 comes into sliding contact with the taper portion 23c on the base 23 side of the locking piece 22, and the second tab piece 30 is By moving in the width direction so as to be separated from the locking piece 22, the second tab piece 30 can be reliably moved to a position where it does not interfere with the locking piece 22 of the first tab piece 20 as shown in FIG. 2.

  When the tool T is gradually opened in the above state and the first tab piece 20 and the second tab piece 30 are spread and separated, the insertion piece 29 slides in the slit 16 by the elastic restoring force of the leaf spring body 12. Since the leaf spring body 12 is reduced in diameter, the hose H can be fastened and fixed to the pipe P.

  At this time, since the locking piece 22 provided on the clamp 10 extends from the first tab piece 20 protruding outward in the radial direction of the leaf spring body 12, the plate is provided around the entire circumference of the hose H to be tightened. The hose H can be fastened to the pipe P by tightly contacting the inner periphery of the spring body 12, and the sealing performance of the hose H connected to the pipe P can be improved.

  In this embodiment, the most distal end portion 25a of the locking piece 22 is narrowed by cutting out the side edge 25b on the locking portion 27a side, so that the width direction center side of the leaf spring body 12 is narrowed. The side edge 27b is notched and formed to be narrower than the portion where the locking portion 27a is provided. Therefore, when the leaf spring body 12 is reduced in diameter from the expanded state as described above, the most distal end portion 25a of the locking piece 22 is prevented from interfering with the second knob piece 30 that slides in the slit 16, The leaf spring body 12 can be smoothly reduced in diameter.

Claims (4)

It has a leaf spring body formed by being curved in an annular shape,
A slit formed along the circumferential direction and a first tab piece protruding radially outward are formed at one end of the leaf spring main body,
The other end of the leaf spring body is inserted into the slit, and is inserted into the slit so as to be slidable in the circumferential direction, and protrudes radially outward from the end of the insertion piece, A second tab piece disposed opposite the first tab piece is formed;
In a hose clamp configured such that when the first tab piece and the second tab piece are brought close to each other from a free state in which the leaf spring body is reduced in diameter, the leaf spring body expands against its elastic force. ,
The first tab piece extends toward the second tab piece and extends in the width direction of the leaf spring body, and is opposite to a surface of the second tab piece facing the first tab piece. A hook-shaped locking piece that can be engaged with the side surface is formed,
In the second knob piece, a stopper portion is formed on the surface opposite to the surface facing the first knob piece to hold the state when the locking piece is engaged,
The locking portion of the locking piece is formed in a position where the leaf spring body is in a free state where the diameter of the leaf spring is reduced, is shifted in the width direction with respect to the stopper portion, and does not overlap when viewed along the circumferential direction. And
The locking piece extends substantially along the circumferential direction of the leaf spring body, and the distal end side of the locking piece is curved inward in the radial direction of the leaf spring body. When the first tab piece and the second tab piece are picked with a tool while the locking piece is locked to the second tab piece, the tip of the tool is guided to the second tab piece. A hose clamp characterized by being configured.   The base portion side of the locking piece has a taper shape extending in the width direction toward the second knob piece side, and when the first knob piece and the second knob piece are brought close to each other, the second knob piece is 2. The hose clamp according to claim 1, wherein the hose clamp is configured to move in the width direction so as to be in contact with a base portion side extending in the width direction of the locking piece and away from the locking piece.   The leading edge portion of the locking piece has a side edge on the locking portion side cut away, and is formed narrower than a portion where the locking portion of the locking piece is provided. 2. The hose clamp according to 2.   The leading edge portion of the locking piece is substantially the same position as the outer peripheral surface of the leaf spring body surrounding the slit toward the slit at the end on the first knob piece side of the leaf spring body, or from that position. The hose clamp according to any one of claims 1 to 3, wherein the hose clamp is curved so as to be positioned radially inward of the leaf spring body.

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