JP2007143787A - Buckle for safety belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a buckle for a safety belt, which has a sufficient durability under a severe use state and securing a safety performance. <P>SOLUTION: This buckle for the safety belt is provided with a buckle body having a base plate and side plates, and a tongue plate having an insertion part engaged with/disengaged from the buckle body, the buckle body has a control lever energized by a spring and engaged with/disengaged from the insertion part by turning, and the tongue plate is pushed in from the engagement state to release the control lever. The control lever has an operation end part projecting to the outside of the buckle body, a spring abutment part and an engagement pawl part, the end of the tongue plate is formed with right and left hook parts; an engagement pawl part of the control lever and the tip of the hook part of the tongue plate are engaged with each other, and the engagement of the hook part and the engagement pawl part is secured by load in a direction in which the tongue plate is separated and the turning of the control lever by the spring against the load in the direction in which the tongue plate is separated in the engagement state of the engagement pawl part of the control lever with the hook part of the tongue plate. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an improvement in a metal buckle for a safety belt (hereinafter referred to as a safety belt buckle) that is used at work in a high place, a construction site, or the like.

  The safety belt buckle used for the safety belt that plays the role of the worker's lifeline at high altitude work or construction site, etc. not only has the functionality that ordinary buckles have and the durability against heavy loads during use It is extremely important to ensure safe safety performance.

  Among the events that hinder the safety performance, a serious problem is that the buckle is inadvertently released due to contact with the release operation lever from the outside. The problem is not different from the loss of lifeline at high altitude, and there is a possibility that it may directly lead to a major accident.

  Therefore, it is necessary to surely prevent a problem that the buckle is unexpectedly released due to contact with the release operation lever from the outside. As an invention for preventing such an inadvertent release of the buckle, for example, it comprises a buckle body and a tongue plate engaged with and disengaged from the buckle body. The tongue plate has a wide head at the tip of the neck portion. A front end of the insertion portion is provided, and the buckle body is provided with a plate insertion space into which the front end of the insertion portion is inserted, and on both sides of the front opening of the plate insertion space, A pair of swingable engaging claws that prevent the distal end of the insertion portion from coming off by engagement with the rear end, and an operating piece portion that faces the outside from both side openings of the plate insertion space on the outer side of each engagement claw And a spring that urges the engaging claw in a direction in which the end of the operation piece comes into contact with the stopper provided in the opening on both sides of the plate insertion space, and is engaged by pressing the operation piece. Nails outward So that the end of the operating piece is in contact with the stopper while the engaging claw is engaged with the rear end of the head, and the engaging claw is engaged with the engaging claw. A play is provided between the tongue plate and the tongue plate to allow the tongue plate to be pushed in. When the tongue plate is pushed in the play range on both sides of the insertion portion, the engagement claw is pushed to release the engagement. A buckle (see, for example, Patent Document 1) characterized in that a pressing portion that swings to a position where it can be operated is provided.

JP 2005-160611 A

  The buckle according to Patent Document 1 maintains a state in which the end of the operation piece is in contact with the stopper in a coupled state of the buckle body and the tongue plate, and the end of the operation piece is pressed by contact with an obstacle. It is possible to prevent the engaging claw from swinging in the disengagement direction and to solve the problem of the buckle according to Patent Document 1 (the problem that the buckle is unexpectedly released).

  However, since the stoppers are provided at the openings on both sides of the plate insertion space, and the end of the operation piece abuts against the stopper, the rotation angle of the operation piece when a strong external force acts on the stopper and deforms it. , The engaging claws do not act sufficiently, and the tongue plate may come off accidentally. Moreover, there is a possibility that the tongue plate may not be inserted into or removed from the buckle body.

  The phenomenon that a strong external force acts on any of the stoppers described above is considered unlikely to occur normally when the buckle is locked, but the operation piece protrudes when the buckle is detached. The buckle which is heavier than that is easily hit against the ground, and there is a possibility that the operation piece protruding by a strong external force may press and deform the stopper.

  Further, in the buckle disclosed as Example 1 in Patent Document 1, the spring used to maintain the state where the end of the operation piece abuts against the stopper is moved sideways by sliding when the tongue plate is pushed. It is moved and is greatly bent by the rotation of the operation piece. The spring tip is pressed from multiple directions, and the push-in operation and the rotation of the operation piece are sometimes performed simultaneously. There are some disadvantages.

  Moreover, since the buckle disclosed as another embodiment in Patent Document 1 is configured to rotate by inserting the distal end of the insertion portion using the operation piece portion as a cam, it is considered that the consumption of the spring can be suppressed to some extent. It is done. However, in the engaged state of the buckle body and the tongue plate, when the distal end of the insertion portion is pushed in, the end of the operation piece protrudes outward and the engagement claw of the operation piece is substantially disengaged. For this reason, even if the end of the operation piece is not released with a finger, when the tongue plate is pulled in the direction of disengagement with a strong force, the engaging claw and the end side of the tongue plate slide against each other, and the tongue plate There is a risk of withdrawal.

  The present invention has been made in view of the above circumstances, has sufficient durability even under severe use conditions, and ensures sufficient safety performance with the buckle body and tongue plate engaged. SUMMARY OF THE INVENTION It is an object of the present invention to provide an excellent safety belt buckle.

  A buckle body having a base plate and a side plate; and a tongue plate having an insertion part detachable with respect to the buckle body. The buckle body is spring-biased and can be engaged with and disengaged from the insertion part by rotation. In a safety belt buckle that includes a pair of left and right operating levers that can be released by pressing the tongue plate from the engaged state of the operating lever and the tongue plate, the operating lever projects out of the buckle body An end portion, a spring contact portion with which the spring abuts, and a meshing claw portion that can mesh with a tip portion of the tongue plate. In the engaged state, the engaging claw part of the operating lever and the front end of the flange part of the tongue plate are engaged, and the engaging claw part of the operating lever and the flange part of the tongue plate In the engaged state, the engaging claw portion of the operating lever is engaged with the flange portion of the tongue plate by the load in the releasing direction of the tongue plate and the rotation of the operating lever by the spring against the load in the releasing direction of the tongue plate. A buckle for a safety belt, which is secured to prevent the tongue plate from being detached, is used as a means for solving the problem.

  According to the present invention, a buckle body having a base plate and a side plate, and a tongue plate having an insertion portion detachable with respect to the buckle body, the buckle body is spring-biased and inserted by rotation. A safety belt buckle that has a pair of left and right operation levers that can be engaged with and disengaged from the part, and that can be released by pushing the tongue plate from the engaged state of the operation lever and the tongue plate, without using a stopper, The operation lever includes an operation end projecting out of a buckle body, a spring abutting portion on which the spring abuts, and a meshing claw portion that can mesh with a tip end portion of the tongue plate. A hook part having a hook shape on both the left and right sides is formed, and in the engaged state, the engaging claw part of the operating lever and the tip of the tongue plate hook part mesh with each other. In the engaged state of the engaging claw portion of the operating lever and the flange portion of the tongue plate, the tongue in the direction of detachment of the tongue plate and the rotation of the operating lever by the spring with respect to the load in the direction of detachment of the tongue plate Since the engagement of the engaging claw portion of the operation lever with the flange portion of the plate is secured, the operation lever is fixed by engagement with the tongue plate and moved inadvertently by external force in the engaged state of the buckle body and the tongue plate. In this case, sufficient safety performance can be ensured when the buckle body and the tongue plate are engaged.

  Further, in addition to the above configuration, as shown in the invention according to claim 2, the spring is made of a metal wire, and a coil is formed on each of the left and right sides of the substantially linear central portion. A configuration in which a bending portion is formed between each, the distal end side is bent outward at the bending portion, the distal end is bent slightly inward, abuts against the operation lever, and the positioning shaft is passed through the coil portion of the spring. In the engaged state of the tongue plate and the buckle body, the center portion of the spring presses and urges the tip of the insertion portion of the tongue plate, so that the tongue plate may be temporarily inadvertently pushed. The tongue plate is pushed back to the original engagement position by the rebound resilience of the central portion of the spring, and the left and right ends of the spring press the operation lever, so that the state where the buckle body and the tongue plate are easily engaged is ensured. It can be.

  In addition, due to the configuration of the spring, the left and right ends of the spring are in contact with the operation lever, and the center of the spring is in contact with the tip of the insertion portion, so that a load is applied to each part of the spring. The durability of the spring can be improved.

  In addition, the structure of the spring is the structure of the invention according to claim 3, that is, the spring is composed of a first spring body and a second spring body, both of which are metal plates, and the first spring body has a central portion viewed from the front. The two spring bodies press the contact portion of the first spring body from the outside, and both ends of the second spring body abut against the operating lever. In the engaged state between the tongue plate and the buckle body, the central portion of the first spring body is configured to press and urge the tip of the insertion portion of the tongue plate, thereby pushing the tongue plate into a mountain shape when viewed from the front. After the raised and strengthened central part comes into contact with the tongue plate, the central part of the second spring body supplementarily supports the first spring body from below by further pressing the tongue plate. The shape of the center of the body , By the synergistic effect of the auxiliary support of the second spring, the spring 15 elasticity can be improved, and the durability in continuous use of the entire spring 15 can be increased remarkably.

A buckle body having a base plate and a side plate; and a tongue plate having an insertion part detachable with respect to the buckle body. The buckle body is spring-biased and can be engaged with and disengaged from the insertion part by rotation. In a safety belt buckle that includes a pair of left and right operating levers that can be released by pressing the tongue plate from the engaged state of the operating lever and the tongue plate, the operating lever projects out of the buckle body An end portion, a spring contact portion with which the spring abuts, and a meshing claw portion that can mesh with a tip portion of the tongue plate. In the engaged state, the engaging claw part of the operating lever and the front end of the flange part of the tongue plate are engaged, and the engaging claw part of the operating lever and the flange part of the tongue plate In the engaged state, the engaging claw portion of the operating lever is engaged with the flange portion of the tongue plate by the load in the releasing direction of the tongue plate and the rotation of the operating lever by the spring against the load in the releasing direction of the tongue plate. Even if a strong external force is applied to the buckle body, the tongue plate is accidentally detached or inserted due to the deformation of the stopper. A buckle for a safety belt that realizes extremely high safety performance with the buckle body and tongue plate engaged with each other without any failure or disengagement failure has been realized.

Example 1
Each figure which shows Example 1 of this invention is demonstrated. 1 is a front view showing an engaged state of a buckle according to a first embodiment of the present invention, FIG. 2 is a rear view showing the buckle according to the first embodiment, and FIG. 3 is a right side view showing the buckle according to the first embodiment. 4 is a cross-sectional view taken along line AA showing the buckle according to the first embodiment, FIG. 5 is a front view showing the buckle body according to the first embodiment of the present invention, and FIG. 6 is the buckle body 1 according to the first embodiment. FIG. 7 is a right side view showing the buckle body according to the first embodiment and a BB cross-sectional view, FIG. 8 is a front view showing a tongue plate according to the first embodiment of the present invention, and FIG. 10 is a rear view showing the tongue plate according to the first embodiment, FIG. 10 is a right side view showing the tongue plate according to the first embodiment, and a cross-sectional view taken along the line C-C. FIG. 11 is a diagram excluding the substrate according to the first embodiment. FIG. 12 is an explanatory view showing an engagement state between the buckle body and the tongue plate, and a partially enlarged view thereof. Explanatory drawing which shows the state which pushed the tongue plate with respect to the buckle main body except the board | substrate which concerns on the same Example 1, FIG. 13 made it possible to detach | separate the buckle main body and the tongue plate except the board | substrate concerning the same Example 1. FIG. FIG. 14 is an explanatory view showing a state in which the buckle according to the first embodiment is attached to the belt.

  The safety belt buckle according to the first embodiment of the present invention includes a stainless steel buckle body 1 and a stainless steel tongue plate 2 that can be attached to and detached from the buckle body 1 as shown in FIGS. .

  As shown in FIGS. 5 to 7, the buckle body 1 according to the first embodiment mainly includes a substrate 12, a sandwiching plate 13 having a thickness of about 2 millimeters, two operation levers 14 having a plate shape, A spring 15 is provided.

  The two operating levers 14 and the spring 15 are disposed between the substrate 12 and the sandwiching plate 13. Further, the rotation shaft 143 of the operation lever 14 communicates and fixes the substrate 12, the operation lever 14, and the clamping plate 13. The positioning shaft 153 for positioning the spring 15 is in a state where the substrate 12, the coil 152 of the spring described later, and the sandwiching plate 13 are communicated. In the first embodiment, the rotating shaft 143 and the positioning shaft 153 both use caulking pins.

  In the substrate 12 according to the first embodiment, the rear end side edge is bent and raised substantially vertically to form the rear wall 120. At the upper end of the rear wall portion 120, a fitting convex portion 123 that fits with the fitting concave portion 130 to be described later is provided.

  On the other hand, a guide groove 121 is formed on the front end side of the substrate 12 for guiding the tip of the insertion portion 20b of the tongue plate 2 when the tongue plate 2 is inserted. Further, a rotation restricting protrusion 122 is formed on the substrate 12 corresponding to the rotation position of the operation lever 14 disposed on the substrate 12.

  Next, the sandwiching plate 13 includes a stainless steel top plate 130 having a thickness of about 2 millimeters and side plates 131 that are integrally formed by bending the left and right side surfaces of the top plate 130 substantially vertically by press molding. A first belt connecting hole 132 for connecting the belt 3 is provided on the rear end side of the top plate 130.

  A fitting recess 133 that is continuous with the first belt connection hole 132 is formed on the front side of the edge of the first belt connection hole 132. The top plate 130 does not include a portion corresponding to the guide groove 121 in the substrate 12, and forms a flat plate-shaped portion 124.

  The operation lever 14 has a shaft hole through which the rotation shaft 143 passes in the approximate center, and an inner portion that serves as a contact portion between the operation end 140 that protrudes outside the buckle body 1 and the rotation restriction projection 122. The restricting edge portion 141, the engaging claw portion 142 with which the postscript portion 202 of the tongue plate 2 is engaged, the spring contact portion 144 with which the postscript end portion 151 of the spring 15 is brought into contact, and the post plate insertion portion 20b of the tongue plate 2 This is a configuration including an insertion portion side surface abutting portion 145 that can abut on the insertion portion side surface 205.

  The spring 15 is made of a metal wire material, and coils 152 are formed on the left and right sides of the substantially straight central portion 150, respectively, and a curved portion 154 is formed between the two coils 152. Is bent outward and the tip is bent slightly inward to form a contact portion 155 with respect to the spring contact portion 144 of the operating lever 14, and a positioning shaft for the coil portion 152 of the spring 15 is formed. It is set as the structure which passed through.

  The tongue plate 2 according to the first embodiment includes a tongue plate body 20 and a belt fixing bracket 21. The tongue plate main body 20 has a side wall 204, and a long hole-like second belt connecting hole 200 and a belt fixing bracket mounting hole 201 are provided on the rear end (belt connecting end) side. The belt fixing metal fitting 21 is fitted in the belt fixing metal fitting mounting hole 201 and slides back and forth while being guided by the side wall 204 so that the second belt connecting hole can be opened and closed.

  The tongue plate body 20 according to the first embodiment includes a frame portion 20a provided with the second belt connecting hole 200 and the belt fixing bracket mounting hole 201, and an insertion portion 20b extending from the front center of the frame portion 20a. Consists of. The width of the insertion portion 20b becomes narrower from the proximal end of the insertion portion 20b to the center. The distal end of the insertion portion 20b is formed wide because the flange portion 202 is formed on both the left and right sides. With this configuration, the tongue plate body 20 is formed very thin. Further, the insertion portion side surface 205 of the insertion portion 20 b can contact the insertion portion side surface contact portion 145 of the operation lever 14. In the first embodiment, the insertion portion 20b is relatively inclined with respect to the frame portion 20a so as to easily fit the wearer's body.

  Further, a guide protrusion 203 protruding downward is formed at the base end of the insertion portion 20b of the tongue plate main body 20 by pressing. The guide protrusion 203 slides with the guide groove 121 when the buckle body 1 and the tongue plate 2 are engaged, thereby ensuring the speed and accuracy of the engagement.

  As described above, the belt fixing bracket is fitted into the belt fixing bracket mounting hole 201 and slides back and forth so that the second belt connecting hole can be opened and closed. The belt fixing bracket has a U-shaped cross-sectional view. A corrugated belt pressing portion 210 is formed along the longitudinal direction at the end on the side exposed to the front.

  With respect to the relationship between the buckle body 1 and the tongue plate 2 having the above-described configuration, the configuration from the mutually engaged state to the released state will be described with reference to FIGS. 11 to 13.

  In the engaged state, as shown in FIG. 11, the end portion of the operation lever 14 protrudes from the side portion of the buckle body 1. And the collar part 202 and the meshing claw part 142 of the operation lever 14 are meshed. Further, both end portions 151 of the spring 15 are in contact with the spring contact portion 144 of the operation lever 14, and the center of the spring 15 is in contact with the tip of the insertion portion 20 b of the tongue plate 2. Both end portions 151 of the spring 15 urges the operation lever 14 toward the central tongue plate 2.

  Further, the center of the spring is biased in the direction of detachment of the tongue plate. By these urgings, the engagement between the flange portion 202 and the engagement claw portion 142 of the operation lever 14 is more firmly coupled. Since this coupled state is very strong, even if an external force acts on the end of the operation lever 14, it rotates both in the direction in which the tongue plate 2 is pushed in and in the direction in which the engagement between the tongue plate 2 and the operation lever 14 is released. Does not move. In this engaged state, the rotation restricting protrusion 122 and the inner restricting edge portion 141 of the operation lever 14 are not in contact with each other.

  Further, in the engaged state, when a force is applied in a direction in which the tongue plate 2 is carelessly detached (indicated by an arrow F in FIG. 11), the load of the direction in which the tongue plate 2 is detached is caused by the load of the operation lever 14. The engaging claw 142 and the flange 202 are in strong engagement, and the resultant force that abuts the insertion portion side surface contact portion 145 of the operation lever 14 and the insertion portion side surface 205 of the insertion portion 20b of the tongue plate 2 by slight rotation of the operation lever. (Indicated by an arrow D in FIG. 11) occurs, and the engagement claw 142 is engaged with the flange 202 and the insertion portion side surface 205, thereby forming a very strong combined state.

The tongue plate 2 can be detached from the buckle body 1 by performing a pushing operation of the tongue plate shown in FIG. 12 and an operation lever rotating operation shown in FIG.
First, as shown in FIG. 12, the tongue plate 2 is pushed into the buckle body 1. At this stage, the operation lever 14 can be operated.

  By the pushing operation of the tongue plate 2, the meshing between the meshing claw 142 of the operation lever 14 and the collar 202 is released. Then, the central portion 150 of the spring 15 is pressed against the tip of the insertion portion 20 b of the tongue plate 2, and the central portion 150 of the spring 15 generates a repulsive elastic force against the tongue plate 2.

  Further, as the tongue plate 2 is pushed, the insertion portion side surface 205 of the insertion portion 20b comes into contact with the insertion portion side surface contact portion 145 of the operation lever 14, and the operation lever 14 is slightly in the direction opposite to the spring biasing direction. To turn. Since the slight rotation of the operation lever 14 presses the end portion 151 of the spring 15, the end portion 151 of the spring 15 generates a larger repulsive elastic force on the operation lever 14.

  If the belt 3 is unexpectedly strongly pulled outward at this stage, the flange portion 202 protruding greatly to the left and right hits the operating lever 14 and prevents the tongue plate 2 from being accidentally detached. Then, the collar portion 202 that protrudes to the left and right abuts against the operation lever 14 for a while, so that the operation lever 14 is returned to a position where it can be engaged with the collar portion 202 due to the spring bias. 202 and the operating lever 14 are brought into an engaged state, and a reliable engaged state can be ensured.

  Next, the operation lever 14 is rotated. When the left and right operation levers 14 are rotated against the bias of the end portion 151 of the spring 15 (indicated by the arrow E in FIG. 13), the insertion portion 20b of the tongue plate 2 is detached between the left and right operation levers 14. A possible space 11 is formed, and the tongue plate 2 can be pulled out from the buckle body 1.

  After the tongue plate 2 is pulled out, the rotation restricting projection 122 abuts against the inner restricting edge portion 141 of the operation lever 14, and the spring 15 is prevented from being released due to excessive rotation of the operation lever 14 after the tongue plate 2 is pulled out. To do.

  The buckle for a safety belt according to the first embodiment has a U-shaped belt fixing bracket 21 in a short cross-sectional view, and a corrugated belt press along the longitudinal direction at the end portion exposed to the front. Since the portion 210 is formed, the belt fixing bracket 21 sandwiches the belt 3 together with the tongue plate 2 by sliding the belt fixing bracket mounting hole 201 with respect to the belt 3 passing through the second belt connecting hole 200. The belt pressing portion 210 presses the belt 3 so as to bite into the belt 3, and the belt 3 can be connected extremely firmly, so that the function as a safety belt buckle can be made extremely high.

  In addition, the safety belt buckle according to the first embodiment has a flat plate shape in which the top plate 130 of the sandwiching plate 13 does not include a portion corresponding to the guide groove 121 of the substrate 12. Even when a strong external force is applied so that the tongue plate 2 bends, the load on the tongue plate 2 can be received by the entire flat plate-shaped portion 124, so that the tip of the insertion portion 20b of the tongue plate 2 is deformed and buckles. It is possible to prevent unintentional detachment of the buckle without being detached from the main body 1.

  Furthermore, since most of the safety belt buckle in the first embodiment can be formed by pressing a metal plate, the safety belt buckle is very inexpensive and can be a thin safety belt buckle.

(Example 2)
Next, each figure which shows Example 2 of this invention is demonstrated. FIG. 15 is a front view showing a spring according to the second embodiment of the present invention, and FIG. 16 is an explanatory view showing an engagement state between the buckle body and the tongue plate excluding the substrate according to the second embodiment of the present invention, and a part thereof. FIG. 17 is an explanatory view showing a state where the tongue plate is pushed into the buckle body excluding the substrate according to the second embodiment, and FIG. 18 is a view showing the buckle body and tongue plate excluding the substrate according to the second embodiment. It is explanatory drawing which shows the state which made detachable.

  The buckle according to the second embodiment is substantially the same in external appearance as that of the first embodiment, and only the configuration of the spring 15 is changed. That is, the same components as those in the first embodiment are used for the substrate 12 of the buckle body 1, the sandwiching plate 13, the two operation levers 14 having a plate shape, and the tongue plate 2 (the tongue plate body 20 and the belt fixing bracket 21). The buckle body 1 and the tongue plate 2 are configured by using the same combination as in the first embodiment.

  And the spring 15 in the buckle which concerns on the present Example 2 is comprised combining two metal board | plate materials, 15A of 1st spring bodies, and the 2nd spring body 15B, as shown in FIG. The first spring body 15A is a first curved portion 154A in which the central portion 150A has a mountain shape when viewed from the front, and both ends are engaged with the positioning shaft. Further, the second spring body 15B forms second curved portions 154B on the left and right sides of the substantially straight central portion 150B. The outer surface of the first curved portion 154A of the first spring body 15A is in contact with the inner sides of the left and right second curved portions 154B and 154B of the second spring body 15B, and is a contact that is the left and right ends of the second spring body in plan view. The central portion 150A of the first spring body 15A is located between the portions 155 and 155.

  With this configuration, as shown in FIG. 16, the first spring body is pressed by the second spring body from the left and right outer sides, and an upward biasing force acts on the central portion of the first spring body. For this reason, in the engaged state of the tongue plate 2 and the buckle body 1, the central portion 150 </ b> A of the first spring body 15 </ b> A presses and urges the distal end of the insertion portion 20 b of the tongue plate 2.

  As shown in FIG. 17, in the second embodiment, after the tongue plate 2 is pushed, the central portion 150 </ b> A having a mountain shape in front view comes into contact with the tongue plate 2, and then the tongue plate 2 is pushed further. Thus, the central portion of the second spring body supplementarily supports the first spring body 15A from below and maintains the strength of the entire spring 15. Then, as shown in FIG. 18, as in the first embodiment, by operating the operation lever, the space 11 can be formed and the buckle body 1 and the tongue plate 2 can be detached.

  As described above, the buckle according to the second embodiment is excellent in that the strength of the spring 15 can be further increased in addition to obtaining the excellent effect of the buckle according to the first embodiment.

It is a front view which shows the engagement state of the buckle which concerns on Example 1 of this invention. It is a rear view which shows the engagement state of the buckle which concerns on Example 1 of this invention. It is a right view which shows the engagement state of the buckle which concerns on Example 1 of this invention. It is AA sectional drawing which shows the engagement state of the buckle which concerns on Example 1 of this invention. It is a front view which shows the buckle main body which concerns on Example 1 of this invention. It is a rear view which shows the buckle main body which concerns on Example 1 of this invention. It is the right view and BB sectional drawing which show the buckle main body which concerns on Example 1 of this invention. It is a front view which shows the tongue plate which concerns on Example 1 of this invention. It is a rear view which shows the tongue plate which concerns on Example 1 of this invention. It is the right view and CC sectional drawing which show the tongue plate which concerns on Example 1 of this invention. It is explanatory drawing which shows the engagement state of the buckle main body and tongue plate except the board | substrate which concerns on Example 1 of this invention, and its partially expanded view. It is explanatory drawing which shows the state which pushed the tongue plate with respect to the buckle main body except the board | substrate which concerns on Example 1 of this invention. It is explanatory drawing which shows the state which made the buckle main body and tongue plate except the board | substrate concerning Example 1 of this invention removable. It is explanatory drawing which shows the state which attached the buckle which concerns on Example 1 of this invention to the belt. It is a front view which shows the spring which concerns on Example 2 of this invention. It is explanatory drawing which shows the engagement state of the buckle main body and tongue plate except the board | substrate which concerns on Example 2 of this invention, and its partially expanded view. It is explanatory drawing which shows the state which pushed the tongue plate with respect to the buckle main body except the board | substrate which concerns on Example 2 of this invention. It is explanatory drawing which shows the state which made the buckle main body and tongue plate except the board | substrate concerning Example 2 of this invention removable.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Buckle main body 11 Space 12 Board | substrate 120 Back wall part 121 Guide groove | channel 122 Rotation restriction protrusion 123 Fit convex part 124 Flat plate-shaped part 13 Clamping plate 130 Top plate 131 Side plate 132 1st belt connection hole 133 Fitting recessed part 14 Operation Lever 140 Operation end portion 141 Internal restriction edge portion 142 Engagement claw portion 143 Rotating shaft 144 Spring contact portion 145 Insertion portion side surface contact portion 15 Spring 15A First spring body 15B Second spring body 150 Central portion 150A Central portion (implementation) Example 2)
150B central part (Example 2)
151 End portion 152 Coil 153 Positioning shaft 154 Bending portion 154A First bending portion (Example 2)
154B Second curved portion (Example 2)
155 Abutting portion 2 tongue plate 20 tongue plate body 20a frame portion 20b insertion portion 200 second belt connecting hole 201 belt fixing bracket mounting hole 202 flange 203 guide projection 204 side wall 205 insertion portion side surface 21 belt fixing bracket 210 belt pressing Part 3 Belt

Claims (3)

A buckle body having a base plate and a side plate; and a tongue plate having an insertion part detachable with respect to the buckle body. The buckle body is spring-biased and can be engaged with and disengaged from the insertion part by rotation. In a safety belt buckle that includes a pair of left and right operation levers that can be released by pushing the tongue plate from the engaged state of the operation lever and the tongue plate,
The operation lever includes an operation end projecting out of the buckle body, a spring contact portion with which the spring contacts, and a meshing claw portion that can mesh with a tip portion of the tongue plate,
The tongue plate is formed with a flange portion in which the shape of the distal end of the insertion portion is formed in a left and right shape,
In the engaged state, the engaging claw portion of the operation lever meshes with the tip of the flange portion of the tongue plate,
When the engaging claw of the operating lever and the flange of the tongue plate are engaged, the load of the tongue plate in the direction of detachment of the tongue plate and the rotation of the operation lever by the spring with respect to the load in the direction of detachment of the tongue plate A buckle for a safety belt characterized in that the engagement claw portion of the operation lever is engaged with the portion to prevent the tongue plate from being detached. The spring is made of a metal wire, and forms a coil on each of the left and right sides of the substantially straight central portion, forms a curved portion between the two coils, and bends the tip side outward at the curved portion, Bend the tip slightly inward to contact the control lever,
The positioning shaft is passed through the coil portion of the spring,
2. The buckle for a safety belt according to claim 1, wherein the center portion of the spring presses and urges the tip of the insertion portion of the tongue plate when the tongue plate and the buckle body are engaged. Each of the springs comprises a first spring body and a second spring body, both of which are metal plates, and the first spring body has a central portion as a front-view mountain shape, and both ends are first curved portions that engage with the positioning shaft, The two spring bodies press the contact portion of the first spring body from the outside, both ends of the second spring body abut on the operation lever,
The buckle for a safety belt according to claim 1, wherein the center portion of the first spring body presses and urges the distal end of the insertion portion of the tongue plate in an engaged state between the tongue plate and the buckle body.

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