Slide rail with pull-in device

Abstract

To provide a slide rail with a pull-in device capable of improving durability with a simple configuration.SOLUTION: A slide rail with a pull-in device includes a pull-in member having a pressure-contact element to elastically have pressure-contact with a rear end part of a mobile side rail and has a pull-in function by forming a pull-in guide path in a fixed side rail. The pull-in member includes: a joint support member; a shaft projection part; a main rotary shaft arranged in the shaft projection part; a turning arm where one end is turnably pivoted to the main rotary shaft and the pressure-contact element is turnably arranged at the other end; and a coil spring for giving turning force to the turning arm. The shaft projection part is projected to a direction on an opposite side of a direction to deform the pull-in guide path at an end part on a projection side. The main rotary shaft is projected in a direction orthogonal to the rail pull-in direction. The turning arm is arranged at a position to be closer to the mobile side rail than to the fixed side rail. The coil spring is arranged on the fixed side rail side from the turning arm.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a slide rail having a retraction function in which a movable member such as a drawer, display shelf, range grill or the like of furniture etc. connected to the slide rail is automatically retracted into a fixed member such as the furniture body once it has been moved to a predetermined position without having to be moved completely from the drawn-out state (fully open slide state) to the storage position (final storage position), and further which prevents the movable member from bouncing back when it is moved forcefully into the fixed member, or prevents the movable member from accidentally jumping out of the fixed member during transportation, an earthquake, etc. [Background technology]

[0002] When storing a movable member such as a drawer in a fixed member such as the main body of furniture, if the movable member is stored forcefully, it may not be stored completely due to the rebound when stored, or the movable member may not be stored completely from the beginning. When the furniture is transported or during an earthquake, the force of the drawer etc. flying out of the fixed member may cause the furniture to fall during transport or tip over, resulting in various inconveniences. To solve this problem, several types of slide rails have been provided that have a retraction function, whereby once the movable member is stored to a predetermined position, it automatically retracts into the fixed member, such as the furniture body.

[0003] In one example, a retraction member is provided on the movable rail, and a retraction guideway is provided on the fixed rail corresponding to the retraction member. The retraction member has a pressure mechanism that elastically presses against the retraction guideway when the movable rail approaches its final designated position relative to the fixed rail, and the retraction guideway is formed integrally with the bent edge of the fixed rail and changes the pressure force of the pressure mechanism into a retraction force in the direction that brings the movable member into its final designated position relative to the fixed member. The present patent applicant has proposed a pressure mechanism consisting of a rotating arm, a bent edge of the fixed rail, a pressure contact that rolls along the retraction guideway, and a spring that applies a biasing force to the rotating arm toward the retraction guideway (Patent Document 1).

[0004] In the retraction member provided in Patent Document 1, a coil spring is used as a spring that applies a biasing force to the rotating arm toward the retraction guideway, and further, a rotating shaft protrudes in the direction of the moving side rail from a connecting support member attached to the moving side rail, a coil spring is wound around the rotating shaft, and the rotating arm is positioned on the moving side rail end of the coil spring. However, in such a configuration, the rotating arm is positioned near the midpoint between the movable rail and the fixed rail in the thickness direction of the slide rail, and the distance between the connecting support member and the rotating arm becomes short. This inevitably reduces the number of turns of the coil spring installed on the connecting support member and the rotating arm, making it difficult to increase the durability of the coil spring. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2017-205149 A Summary of the Invention [Problem to be solved by the invention]

[0006] In view of the above problems, an object of the present invention is to provide a slide rail with a retraction device that has a simple configuration and can improve durability. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides a first means for solving the above problems, in which a retraction member having a pressure contact that elastically presses against the bent edge of a fixed rail is provided at the rear end of a movable rail, and a retraction function is provided in which a retraction guideway is formed integrally with the bent edge of the fixed rail in the direction of retracting the movable rail from a predetermined position at the rear end of the bent edge of the fixed rail where the pressure contact is pressed, and the retraction member is attached to the movable rail and comprises a connection support member at least a part of which protrudes from the storage side end of the movable rail in the direction of retracting the movable rail, a shaft protruding part formed on the protruding part, a main rotating shaft provided on the shaft protruding part, and a retraction member having one end rotatably pivoted to the main rotating shaft and the other end pressure-contacted to the main rotating shaft. The device is composed of a rotating arm having a pressure contact element that is freely rotatable, and a coil spring that is wound around the outer periphery of the main rotating shaft and applies a rotational force to the rotating arm, and the rotating arm rotates while the pressure contact element elastically presses against the retraction guideway. The shaft protrusion is arranged at a position that protrudes upward from the upper bent edge on the upper side that faces vertically opposite to the downward direction in which the retraction guideway gradually deforms at the end of the slide rail in its most contracted state, and the main rotating shaft protrudes in a direction perpendicular to the direction in which the movable rail is retracted, and at least the main rotating shaft side of the rotating arm is arranged at a position closer to the movable rail than the fixed rail, and the coil spring is arranged on the fixed rail side than the rotating arm.

[0008] In order to solve the above problems, the second means of the present invention, in addition to the configuration as the first means, is configured such that, when viewed from the front of the slide rail, the shaft protrusion is positioned at a position offset from the inner surface side of the base plate between at least a pair of upper and lower folded edges of the movable rail toward the fixed rail, and the main rotating shaft protrudes from the shaft protrusion toward the movable rail.

[0009] In order to solve the above problems, the third means of the present invention comprises, in addition to the configuration of the first means, the shaft protrusion is positioned closer to the base plate of the movable rail than to the base plate of the fixed rail when viewed from the front of the slide rail, and the main rotating shaft protrudes from the shaft protrusion toward the fixed rail.

[0010] In order to solve the above problems, the present invention provides a fourth means in which, in addition to the configuration as the first means above, the part for fixing the main rotating shaft comprises, when viewed from the front of the slide rail, a shaft protrusion that is positioned offset from the inner surface of the base plate between a pair of upper and lower folded edges of the moving side rail toward the fixed side rail, and a second shaft protrusion that is positioned closer to the base plate of the moving side rail than the base plate of the fixed side rail, and at least one end of the main rotating shaft is connected to the shaft protrusion and the other end is connected to the second shaft protrusion. Effect of the Invention

[0011] When configured as the first means of the present invention, the coil spring is positioned on the fixed rail side of the rotating arm, so that the rotating arm can be installed at a position away from the base plate of the fixed rail towards the base plate of the movable rail. Therefore, the coil spring can be set utilizing the length from the rotating arm to the base plate side of the fixed rail, which makes it possible to increase the number of turns of the coil spring and improve the durability of the coil spring.

[0012] When configured as the second means of the present invention, in addition to the effects achieved by configuring it as the first means, the shaft protrusion is positioned at a position offset toward the fixed rail, so that the main rotating shaft can be extended further toward the opposite side of the fixed rail than the base plate of the movable rail, and the rotating arm can be pivoted near the extended end of the main rotating shaft, so that the distance between the shaft protrusion and the rotating arm can be set wide, making it possible to increase the number of turns of the coil spring and improving the durability of the coil spring.

[0013] When configured as the third means of the present invention, in addition to the effects of the first means, the shaft protrusion is positioned closer to the base plate of the movable rail than to the base plate of the fixed rail, making it possible to extend the main rotating shaft to the fixed rail base plate side, allowing the distance between the shaft protrusion and the rotating arm to be set wider, and enabling the number of turns of the coil spring to be increased, thereby improving the durability of the coil spring.

[0014] According to the fourth aspect of the present invention, in addition to the effects of the first aspect, the portion for fixing the main rotating shaft is composed of an axle protrusion disposed at a position offset toward the fixed rail, and a second axle protrusion disposed at a position closer to the base plate of the movable rail than to the base plate of the fixed rail, and one end of the main rotating shaft is connected to the axle protrusion and the other end is connected to the second axle protrusion, so that the main rotating shaft is fixed at both ends and stabilized. Therefore, the rotating arm can be pivoted stably, so that even if the strength of the coil spring is increased, the main rotating shaft will not be twisted unnecessarily, and the number of turns of the coil spring can be increased to improve durability. [Brief description of the drawings]

[0015] [Figure 1] FIG. 2 is a perspective view of the slide rail with retraction device of the present invention in the shortest contracted state. [Diagram 2] FIG. 4 is a perspective view of the slide rail with retraction device of the present invention in the middle of being extended. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. 2 is a cross-sectional view of the basic structure of the slide rail of the present invention. [Figure 6] FIG. 4 is a rear view of the slide rail with retraction device in the shortest contracted state. [Figure 7] Enlarged view of the retraction device part. [Figure 8] FIG. 6 is a perspective view of a retraction device according to a second embodiment of the present invention. [Figure 9] FIG. 11 is a perspective view of a retraction device according to a third embodiment of the present invention. [Figure 10] Six-sided view of the retractable member. [Figure 11] Six-view of the retractable member in operation. [Figure 12] FIG. BEST MODE FOR CARRYING OUT THEINVENTION

[0016] Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The basic structure of the slide rail of the first embodiment will be described with reference to FIGS. The symbol 100 indicates a slide rail of the present invention, and the slide rail 100 is composed of a movable rail 1, a fixed rail 2 which is capable of sliding relative to the movable rail 1 via a ball retainer 3 which rotatably holds balls 30..., a retraction member 5 attached to the rear end of the movable rail 1, and a retraction guideway 7 provided in the fixed rail 2 corresponding to the retraction member 5. In the following description, the diagonally upward left side in FIG. 1 is referred to as the pull-out side or front side, and the diagonally downward right side in FIG. 6 is referred to as the rear side, and the opposite side as the front side, and the up, down, left and right directions in FIG. 6 are referred to as the same up, down, left and right directions in the following description.

[0017] The movable rail 1 is formed into an approximately C-shaped cross section by upper and lower bent edges 11, 11 having ball sliding grooves 10, 10 running along the inner surface longitudinal direction, formed by bending both short ends of a thin metal strip inwardly into an arc shape, and a movable rail base plate 12 which is connected to a drawer, etc. The pull-out side end of the movable side rail base plate 12 is bent toward the fixed side rail 2 to form a movable side storage stopper, and a movable side pull-out stopper is formed on the rear side of the movable side rail base plate 12, with a portion of the stopper protruding toward the fixed side rail 2. An engagement hole 121 and a screw hole 122 for attaching the retraction member 5 are provided in the vicinity of the retraction side of the movable rail base plate 12.

[0018] The fixed side rail 2 is formed into an approximately C-shaped cross section by upper and lower bent edges 21, 21 having ball sliding grooves 20, 20 in the longitudinal direction of the outer surface formed by bending both short ends of a thin metal strip outward into an arc shape, and a fixed side rail base plate 22. A portion of the front pull-out side of the fixed rail base plate 22 protrudes toward the movable rail 1 to form a retainer rear end stopper against which the rear end of the ball retainer 3 abuts when the movable rail 1 is pulled out. The rear end of the upper bent edge 21 of the fixed rail 2 is bent in an arc shape so as to incline downward in correspondence with the retraction member 5, thereby forming a retraction guideway 7, which will be described later, that is continuous with the upper bent edge 21.

[0019] The ball retainer 3 is a strip of metal plate of a size that can be inserted between the movable rail 1 and the fixed rail 2, and is approximately one-third the length of the fixed rail 2. It consists of a U-shaped base plate 31 and upper and lower bent pieces 32, 32 connected to the upper and lower ends of the base plate 31 that protrude between the upper and lower bent edges 11, 11, 21, 21 of the movable rail 1 and the fixed rail 2, and holds a number of balls 30... in a freely rotatable manner at several points in the sliding direction of the upper and lower bent pieces 32, 32. A portion of the rear end of base plate 31 protrudes toward fixed rail base plate 22 to form a rear stopper for when the retainer is pulled out that abuts against the rear end of the retainer rear end stopper of the fixed rail 2 when the movable rail 1 is pulled out to the fullest extent, and a portion of the front of base plate 31 protrudes toward base plate 12 of the movable rail 1 to form a front stopper for when the retainer is pulled out that abuts against the rear end of the moving side pull-out stopper of the movable rail 1 when the movable rail 1 is pulled out to the fullest extent.

[0020] In other words, when the movable rail 1 of the slide rail 100 is in the fully extended state, the movable-side extension stopper 14 of the movable rail 1 abuts against the front stopper of the retainer 3 when the retainer is extended, and the rear stopper of the retainer when the retainer is extended abuts against the rear end stopper of the fixed rail 2; on the other hand, when the slide rail 100 is in the fully contracted state (shown in Figure 2), the movable-side storage stopper of the movable rail 1 abuts against the front end faces of the upper and lower folded edges 21, 21 of the fixed rail 2.

[0021] The retraction guideway 7 has a shape in which the upper bent edge 11 protruding rearward from the fixed rail base plate 22 of the fixed rail 2 is sequentially deformed into an arc in the direction of retracting the movable rail 1 from a predetermined position behind the upper bent edge 21 of the fixed rail 2, and has the same cross section as the upper bent edge 21 of the fixed rail 2, and is formed integrally with the upper bent edge 21, continuing from the upper bent edge 21. That is, the fixed side rail base plate 22 and the rear end of the lower folded edge 21 are cut off by a predetermined distance in the front-to-rear direction to form a processing cut-off portion 71, leaving the upper folded edge 21 of the fixed side rail 2. The remaining upper folded edge 21 of the fixed side rail 2 is then deformed into a quarter-circular arc shape to form a shape identical to the outer shape of the upper folded edge 21 of the fixed side rail 2, continuous with the rear end of the upper folded edge 21 and integral with the upper folded edge 11.

[0022] The retraction member 5 of the first embodiment is mainly composed of a connecting support member 50 attached to the moving side rail 1, an axle protrusion 51 provided on the connecting support member 50, a main rotating shaft 52 fixed to the axle protrusion 51, a rotating arm 53 pivoted to the main rotating shaft 52 so as to be freely rotatable, a coil spring 54 wound around the outer periphery of the main rotating shaft 52, a secondary rotating shaft 55 fixed to the rotating arm 53, and a pressure contact 56 attached to the secondary rotating shaft 55 so as to be freely rotatable.

[0023] The connecting support member 50 is formed integrally from synthetic resin and includes a connecting portion 501 which is formed in a plate shape mainly to fit along the outer surface of the movable rail base plate 12 of the movable rail 1 when viewed from the rear of the slide rail 100, a support 502 which protrudes horizontally from the upper end of the connecting portion 501 toward the fixed rail 2 above the upper folded edge 11 of the movable rail 1, and an axial protrusion 51 which hangs down from the end of the support 502 on the fixed rail 2 side.

[0024] The connecting portion 501 is provided with an engagement piece 501a that engages with an engagement hole 121 provided in the movable rail base plate 12, and also with a fixing hole 501b for fastening to the movable rail base plate 12 with a screw. The support body 502 is formed by a support part 502a which protrudes horizontally from the upper end of the connecting part 501 towards the fixed side rail 2, and a support protrusion 502b which protrudes from the support part 502a in the retraction direction. A notched groove 503 which is long in the sliding direction of the slide rail is provided between the upper part of the connecting part 501 and the support part 502a. The retraction side of the groove 503 is open, and a part of it rises upward and is used as a spring holding part 504 which holds one end arm of the coil spring 54 described later. A shaft protrusion 51 is formed to protrude downward from the fixed rail side of the support projection 502b. The shaft protruding portion 51 is provided with a main rotating shaft holding hole 511 which is a round hole penetrating in the horizontal direction.

[0025] The main rotating shaft 52 is formed in a cylindrical shape and includes a cylindrical main shaft portion 521, a disk-shaped flange portion 522 having a larger diameter than the main shaft portion 521 at one end side (moving rail side) of the main shaft portion 521, and a fixed shaft portion 523 having a smaller diameter than the main shaft portion 521 at the other end side (fixed rail side) of the main shaft portion 521.

[0026] The rotating arm 53 has a cylindrical bearing portion 532 formed to protrude from the flat portion on one end side of the arm portion 531 which is formed in an elongated oval shape, a through hole 533 which is slightly larger in diameter than the main shaft portion 521 of the main rotating shaft 52 and which penetrates the bearing portion 532 and the arm portion 531 in the left-right direction is provided, a secondary rotating shaft holding hole 534 is formed which penetrates the other end side of the arm portion 531 in the left-right direction, and a locking protrusion 535 which protrudes in the same direction as the bearing portion 532 is formed between the through hole 533 and the secondary rotating shaft holding hole 534 of the arm portion 531, and the rotating arm 533 is integrally formed from synthetic resin.

[0027] Coil spring 54 is composed of coil portion 541 which is a wound spring, first locking portion 542 protruding from one end of coil portion 541, and second locking portion 543 protruding from the other end of coil portion 541. Generally, the durability of coil spring 54 is improved by increasing the number of turns of coil portion 541.

[0028] The sub-rotating shaft 55 is formed in a cylindrical shape like the main rotating shaft 52, and includes a cylindrical sub-shaft portion 551, a disk-shaped flange portion 552 having a larger diameter than the sub-shaft portion 521 at one end side (fixed rail side) of the sub-shaft portion 551, and a fixed shaft portion 553 having a smaller diameter than the sub-shaft portion 551 at the other end side (movable rail side) of the sub-shaft portion 551. In the first embodiment, the main rotary shaft 52 and the sub rotary shaft 55 have the same shape.

[0029] The pressure contactor 56 has a rotating roller portion 561 having an outer shape that follows the ball sliding groove 20 of the upper bent edge 21 (retraction guideway 9) of the fixed side rail 2, and a cylindrical bearing portion 562 formed so as to protrude from the flat portion on one end side of the rotating roller portion 561, and a through hole 563 having a diameter slightly larger than that of the secondary shaft portion 551 of the secondary rotating shaft 55 that penetrates the bearing portion 562 and the rotating roller portion 561 in the left-right direction is provided, and is integrally formed from synthetic resin.

[0030] The above-mentioned components of the lead-in member 5 are combined as follows. First, the secondary rotating shaft 55 is inserted from the fixed shaft portion 553 side into the through hole 563 of the pressure contactor 56 from the rotating roller portion 561 side. When inserted, the fixed shaft portion 553 protrudes from the through hole 563. Then, when the fixed shaft portion 553 is inserted into the secondary rotating shaft holding hole 534 of the rotating arm 53 and the tip of the fixed shaft portion 553 is crimped, the secondary rotating shaft 55 is fixed to the rotating arm 53 while holding the pressure contactor 56 rotatably about the secondary rotating shaft 55 as an axis.

[0031] Next, the coil spring 54 is inserted into the bearing portion 532 of the rotating arm 53 from the second locking portion 543 side of the coil portion 541. Then, the second locking portion 543 is locked to the inside of the locking projection 535 as shown in FIG. Then, the main rotating shaft 52 is inserted into the through hole 533 of the rotating arm 53 from the side opposite the bearing portion 532, from the fixed shaft portion 523 side. When inserted, the fixed shaft portion 523 protrudes from the through-hole 533. Then, when the fixed shaft portion 523 is inserted into the main rotating shaft holding hole 511 of the connecting support member 50 from the connecting portion 501 side and the tip of the fixed shaft portion 523 is crimped, the main rotating shaft 52 is fixed to the shaft portion protruding portion 51 while holding the rotating arm 53 rotatably about the main rotating shaft 52 as an axis. At this time, the first locking portion 543 of the coil spring 54 is locked to the spring holding portion 504 of the connection support member 50.

[0032] In this state, the coil spring 54 biases the rotating arm 53 so as to retract it toward the connecting portion 501. Therefore, when the rotating arm 53 is rotated in a direction in which the pressure contactor 56 side moves away from the connecting portion 501 and then released, the biasing force of the coil spring 54 causes the rotating arm 53 to rotate back toward the connecting portion 501.

[0033] A method for attaching the retractable member 5 thus assembled to the moving rail 1 of the slide rail 100 will be described. With the slide rail 100 in its fully contracted state, the engaging piece 501a of the connecting part 501 is inserted from the surface of the fixed rail 2 facing the engaging hole 121 of the movable rail base plate 12, the flat part of the connecting part 501 is brought into close contact with the movable rail base plate 12, the outer peripheral convex surface of the rotating roller 561 is aligned with the retraction guide path 7 provided on the fixed rail 2, and the retraction member 5 is attached to the slide rail 100 by fastening with a screw using the fixing hole 501b and the screw hole 122.

[0034] The present invention is configured as described above, and in the most contracted state of the slide rail 100 (the state shown in Figs. 1 and 7), the shaft protrusion 51 (main, main rotating shaft 52) ​​protrudes in the direction opposite to the direction in which the retraction guideway deforms in the most contracted state of the slide rail 100. The pressure contactor 56 is elastically pressed against the lower end of the retraction guideway 7 by the coil spring 54, and always biases the moving-side rail 1 to move in the direction of the storage side, so that the moving-side rail 1 is not inadvertently drawn out to the drawer side, and the most contracted state of the slide rail 100 can be reliably maintained.

[0035] 7 against the biasing force of the coil spring 54, the rotating arm 53 moves forward together with the movable rail 1, and the pressure contactor 56 moves from the retraction guideway 7 to the rear end of the outer surface of the upper bent edge 21 of the fixed rail 2. At this time, the pressure direction of the pressure contactor 56 changes in the shape of the retraction guideway 7, causing the movable rail 1 to move forward with resistance smaller than the initial resistance, and then the pressure contactor 56 is located at the upper bent edge 21 of the fixed rail 2, and the resistance from the biasing force of the coil spring 54 is almost eliminated, and the movable rail 1 is pulled out to the maximum extension state.

[0036] In other words, taking advantage of the fact that users tend to pull out the movable member with a stronger sense of force when they first begin to pull it out, the retraction guideway 7 is made arc-shaped, which not only makes it possible to obtain a smooth sliding sensation, but also because the retraction guideway 7 and the upper bent edge 21 of the fixed rail 2 are formed continuously and integrally with each other in the same shape, there are no subtle differences in level, and no discomfort is felt even when the pressure contact 56 moves from the retraction guideway 7 to the upper bent edge 21 (and the same applies in the reverse direction). Furthermore, since the pressure contact member 56 is in pressure contact with the downward end of the arc when the slide rail 100 is in the fully contracted state, the fully contracted state of the slide rail 100 can be reliably maintained.

[0037] Then, when the movable rail 1 is pushed in from the maximum extension state of the slide rail 100 (when the movable member connected to the movable rail 1 is stored), the pressure contact 56 is positioned in the retraction guideway 7 from the rear end of the upper bent edge 21 of the fixed rail 2, and the movable rail 1 is automatically retracted by the biasing force of the coil spring 54. As both ends of first locking portion 542 and second locking portion 543 of coil spring 54 successively approach each other, the biasing force of coil spring 54 weakens. However, since the storage side end of retraction guideway 7 is shaped to protrude downward, the pressure direction of pressure contactor 56 becomes the sliding direction of slide rail 100, thereby compensating for the weakening of the biasing force of coil spring 54 and reliably maintaining the minimum contracted state.

[0038] Furthermore, since the rotating arm 53 is arranged to be rotatable within a range from a substantially horizontal position to a substantially vertical position, the pressure contactor 56 can move successively from the up-down direction to the sliding direction. Therefore, even if the retraction guideway 7 is short in the sliding direction, the retraction stroke can be configured to be long, so that the required sliding stroke can be obtained without increasing the overall length of the slide rail.

[0039] And, since rotating arm 53 is disposed closer to movable rail 1 than coil spring 54, and coil spring 54 is disposed closer to fixed rail 2 than arm portion 531 of fixed arm 53, it is easy to set the number of turns of coil spring 54. In particular, by lengthening the axial length of main rotating shaft 52, it is possible to increase the number of turns of coil spring 54, in which case rotating arm 53 moves outward from movable rail base plate 12 (to the opposite side of fixed rail 2). Since slide rail 100 is usually easier to use if it has as little protrusion as possible outward from fixed rail base plate 22 (the opposite side of movable rail 1), by positioning rotating arm 53 on the movable rail 1 side of coil spring 54 as described above, it is possible to increase the number of turns of coil spring 54 while reducing the protrusion outward from fixed rail base plate 22. In this way, by positioning the rotating arm 53 on the movable rail 1 side of the coil spring 54 and configuring the rotating arm 53 so that it can be positioned outside the movable rail base plate 12 (on the opposite side of the fixed rail 2), it is possible to increase the number of turns of the coil spring 54 while eliminating the protruding portion outside the fixed rail base plate 22.

[0040] The second and third embodiments are similar to the first embodiment in terms of the functions of the rotating arm 53, coil spring 54, retraction guideway 7, and retraction member 5, but differ mainly in the configurations of the shaft protrusion 51 of the connecting support member 50 and the main rotating shaft 52.

[0041] A second embodiment will now be described. In the second embodiment, as shown in FIG. 8, the groove 503 and the spring retaining portion 504 of the connecting support member 50 are similar to those of the first embodiment, and the shaft protrusion 51 is formed to protrude from the upper rear side of the connecting portion 501 toward the rear side, and the shaft protrusion 51 is formed to protrude outward from the movable rail base plate 12 (the opposite side of the fixed rail 2) so that the rotating arm 53 can be positioned outward from the movable rail base plate 12 (the opposite side of the fixed rail 2). The shaft protruding portion 51 is provided with a main rotating shaft holding hole 511, similar to the first embodiment.

[0042] The main rotating shaft 52 is the same as that in the first embodiment, but is installed in the opposite direction to that in the first embodiment in the left-right direction. Therefore, the coil spring 54 is inserted into the bearing portion 532 of the rotating arm 53 from the second locking portion 543 side of the coil portion 541, and the second locking portion 543 is locked to the inside of the locking protrusion 535. Then, the main rotating shaft 52 is inserted into the through hole 533 of the rotating arm 53 from the bearing portion 532 side and from the fixed shaft portion 523 side. When inserted, the fixed shaft portion 523 protrudes from the rotating arm 53 side of the through hole 533, and when the fixed shaft portion 523 is inserted into the main rotating shaft holding hole 511 from the fixed side rail 2 side and the tip of the fixed shaft portion 523 is crimped, the main rotating shaft 52 is fixed to the shaft portion protrusion portion 51 while holding the rotating arm 53 freely rotatable around the main rotating shaft 52 as an axis. At this time, the first locking portion 543 of the coil spring 54 is locked to the spring holding portion 504 of the connection support member 50.

[0043] By configuring it in this manner, it is possible to position the rotating arm 53 on the moving rail 1 side of the coil spring 54, and also to position the rotating arm 53 outside the moving rail base plate 12 (the opposite side of the fixed rail 2), thereby eliminating the protruding portion outside the fixed rail base plate 22 and increasing the number of turns of the coil spring 54.

[0044] Next, a third embodiment will be described. In the third embodiment, as shown in FIG. 9, the groove 503 and spring holding portion 504 of the connecting support member 50, the shaft protrusion 52, and the main rotating shaft holding hole 511 are similar to those of the first embodiment, and the second shaft protrusion 51a is formed to protrude from the upper rear side of the connecting portion 501 toward the rear side, similar to the shaft protrusion 52 of the second embodiment, and the second shaft protrusion 51a is bent so that the rotating arm 53 can be positioned outside the movable side rail base plate 12 (the opposite side of the fixed side rail 2). The second shaft protrusion 51a is provided with a second main rotating shaft holding hole 511a, similar to the second embodiment.

[0045] The main rotating shaft 52 has a similar configuration to that of the first embodiment, but the axial length of the main rotating shaft 52 is set to be longer than that of the first embodiment. Then, the coil spring 54 is inserted into the bearing portion 532 of the rotating arm 53 from the second locking portion 543 side of the coil portion 541, and the second locking portion 543 is locked to the inside of the locking protrusion 535.Then, the bearing portion 532 of the rotating arm 53 is positioned between the shaft portion protrusion 51 and the second shaft portion protrusion 51a, and the center line of the through hole 533 of the rotating arm 53 is aligned with the center line connecting the main rotating shaft holding hole 511 and the second main rotating shaft holding hole 511a. Next, the main rotating shaft 52 is inserted from the fixed shaft portion 523 side to the second main rotating shaft holding hole 511a side, and the fixed shaft portion 523 is exposed from the main rotating shaft holding hole 511 while passing through the through hole 533. Then, when the tip of the fixed shaft portion 523 is crimped, the main rotating shaft 52 is fixed between the shaft portion protruding portion 51 and the second shaft portion protruding portion 51a while holding the rotating arm 53 rotatably around the main rotating shaft 52 as an axis. At this time, the first locking portion 543 of the coil spring 54 is locked to the spring holding portion 504 of the connection support member 50. With this configuration, it is possible to support the main rotating shaft 52 at both ends, so that the main rotating shaft 52 can be stably installed, and therefore the rotation of the rotating arm 53 can also be stably performed.

[0046] In the above embodiment, the retraction guideway 7 is formed in a quarter arc shape with a radius equal to the height dimension of the fixed rail 2 (height of the base plate 22), but if the radius (curvature radius) is made larger, the arc length becomes longer, and the retraction stroke also becomes longer. However, if the urging force of the coil spring 54 of the retraction member 5 described later is constant, the retraction speed becomes slower (the retraction force becomes weaker). On the other hand, if the radius (curvature radius) of the circular arc is small, the arc length becomes shorter, and the retraction stroke also becomes shorter. However, if the urging force of the coil spring 54 of the retraction member 5 (described later) is constant, the retraction speed becomes faster (the retraction force becomes stronger).

[0047] The retraction device consisting of the retraction member 5 and retraction guideway 7 described above can be used not only for a two-rail slide rail consisting of a moving rail and an intermediate rail as in the embodiment, but also for a three-rail slide rail having an intermediate rail between the moving rail and the intermediate rail with a ball retainer interposed therebetween. [Industrial Applicability]

[0048] As described in detail above, the present invention can be used in a wide range of applications, for example, by attaching it between the main body and drawer of furniture, or between the main body of a display shelf and its shelves, or even to the paper feed tray of a copier, the tray of a kitchen grill, or the drawer of financial equipment. [Explanation of symbols]

[0049] 100 Slide Rail 1 Moving rail 11 Upper and lower bent edges 12 Moving side rail base plate 2 Fixed side rail 20 Ball sliding groove 21 Upper and lower bent edges 22 Fixed side rail base plate 3 Ball Retainer 31 Substrate 32 Folded piece 30 Ball 5 Retractable member 50 Connection support member 501 Connection part 501a Engagement piece 501b fixing hole 502 Support 502a Support part 502b Support protrusion 503 Groove 504 Spring holder 51 Shaft protrusion 51a Second shaft protrusion 511 Main rotating shaft holding hole 511a Second main rotating shaft holding hole 52 Main Rotating Shaft 521 Main shaft section 523 Fixed shaft part 53 Rotating Arms 531 Arm section 532 Bearing section 533 Through hole 534 Sub-rotating shaft retaining hole 535 Locking protrusion 54 Coil spring 541 Coil section 542 First locking part 543 Second locking part 55 Secondary rotating shaft 551 Subshaft part 553 Fixed shaft part 56 Pressure Welder 561 Rotating Roller 562 Bearing section 563 Through hole 7. Guideway

Claims

1. A retraction member having a pressure contactor that elastically presses against the bent edge of the fixed rail is provided at the rear end of the movable rail, and a retraction guideway is formed integrally with the bent edge of the fixed rail in the direction of retracting the movable rail from a predetermined position at the rear end of the bent edge of the fixed rail where the pressure contactor presses, and the retraction member has a retraction function of forming a retraction guideway integrally with the bent edge of the fixed rail in the direction of retracting the movable rail, and the retraction member is attached to the movable rail and comprises a connection support member at least a part of which protrudes from the storage side end of the movable rail in the direction of retracting the movable rail, a shaft protruding part formed on the protruding part, a main rotating shaft provided on the shaft protruding part, a rotating arm having one end rotatably pivoted to the main rotating shaft and the pressure contactor rotatably provided at the other end, and a retraction member on the outer periphery of the main rotating shaft. a coil spring wound around the retractable rail and applying a rotational force to the retractable arm, the retractable arm resiliently pressing against the retraction guideway while the retractable arm resiliently rotates, the shaft protrusion is disposed at a position protruding upward from the upper bent edge on the upper side opposed to the downward direction in which the retraction guideway gradually deforms at the end of the slide rail in its most contracted state, the main rotating shaft protruding in a direction perpendicular to the direction in which the movable rail is retracted, at least the main rotating shaft side of the rotating arm is disposed at a position closer to the movable rail than the fixed rail, and the coil spring is disposed on the fixed rail side than the rotating arm.

2. 2. The slide rail with retraction device according to claim 1, characterized in that, when viewed from the front of the slide rail, the shaft protrusion is positioned at a position offset from the inner surface of the base plate between at least a pair of upper and lower folded edges of the movable rail toward the fixed rail, and the main rotation shaft protrudes from the shaft protrusion toward the movable rail.

3. 2. A slide rail with a retraction device as described in claim 1, characterized in that, when viewed from the front of the slide rail, the shaft protrusion is positioned closer to the base plate of the movable rail than to the base plate of the fixed rail, and the main rotation shaft protrudes from the shaft protrusion toward the fixed rail.

4. 2. The slide rail with retraction device according to claim 1, characterized in that the portion for fixing the main rotating shaft comprises, in a front view of the slide rail, an axial protrusion that is positioned offset from the inner surface of the base plate between a pair of upper and lower bent edges of the movable rail toward the fixed rail from the inner surface side toward the fixed rail, and a second axial protrusion that is positioned closer to the base plate of the movable rail than to the base plate of the fixed rail, and the main rotating shaft is connected at least at one end to the axial protrusion and at the other end to the second axial protrusion.

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