JP3176308U - Screwless conduit fitting - Google Patents

Abstract

There is provided a connector for a screwless conduit tube capable of receiving a pipe end face and feeding pipes in the front-rear direction.
A center packing receiving concave groove (20) which is depressed by a certain depth (G3) from an inner peripheral surface thereof is cut out at an intermediate portion of a cylindrical connector body (C), and the packing receiving concave circumference is also provided. A ring shape is formed from rubber that is thinner than the notch depth (G3) of the groove (20), and a conduit receiving lip (22) from the center of the inner peripheral surface of the inner peripheral surface of the connector main body (C). A center packing (21) having a T-shaped cross section that protrudes at a substantially right angle larger inward than the packing receiving concave circumferential groove (20) of the connector main body (C) was fitted.
[Selection] Figure 1

Description

  The present invention relates to a connector for a screwless conduit (steel tube for cable protection) used in cable wiring.

  The applicant of the present invention has already disclosed Patent No. 3679049 (Patent) regarding a structure capable of receiving the pipe end surface of the screwless conduit in this kind of screwless conduit fitting (coupling) and allowing the feed pipe of the conduit. Document 1) has been obtained.

  The cross-sectional wedge-shaped conduit receiving lip (29) projecting obliquely inward from the inner peripheral surface of the center partition packing (28) disclosed in Patent Document 1 has an insertion direction (F) adapted to the inclined posture state (F ) To the coupling body (C) when inserted into the coupling body (C), it allows the piping (P) feed pipe to the coupling body (C) by acting in a downward direction, while the reverse direction ( When the conduit (P) is inserted into the coupling body (C) from R), it is determined that the end face of the conduit is received so as not to penetrate. As a result, the center partition bolt (5 This eliminates the need for troublesome advance / retreat operations such as), and has the advantage of not inadvertently dropping out of the coupling body or intrusion of rainwater.

Japanese Patent No. 3679049

  However, in the configuration of the center partition packing (28) disclosed in Patent Document 1, the cross-sectional wedge-shaped electric conduit that intersects the cylindrical core wire (OO) of the coupling body (C) at an acute angle (β). The receiving lip (29) protrudes diagonally inward by a certain amount (Z), and the conduit (P) must be inserted into the coupling body (C) from the insertion direction (F) that adapts to the inclined posture state. In this case, the conduit receiving lip (29) does not invert and does not allow the feeding pipe of the conduit (P), so it is still inconvenient in connection piping work, and in particular the insertion direction of the conduit (P) ( The guide arrow (30) indicating F) must be provided so as to be visible on the outer peripheral surface of the coupling body (C).

  In addition, as a direction that can correctly correspond to the guide arrow (30), the center partition packing (28) must be fitted into the center partition packing receiving groove (27) of the coupling body (C). The assembly work is cumbersome and inconvenient.

  The present invention aims to improve such a problem, and in order to achieve the purpose, it is fixed from the inner peripheral surface to the middle part of the connector body having a substantially cylindrical shape corresponding to the unthreaded conduit. Cut out the center packing receiving concave groove that sinks only to the depth,

  A ring-shaped center packing made of rubber that is thinner than the notch depth is fitted into the center packing receiving concave groove, and

  By shaping the center packing into a T-shaped cross section in which the conduit receiving lip protrudes from the central portion of the inner peripheral surface of the center packing and extends up substantially at a right angle than the inner peripheral surface of the connector main body.

  Regardless of whether the unthreaded conduit tube is inserted into the connector main body from either the front or back direction, the conduit tube receiving lip of the center packing receives the tube end surface, and further, the conduit tube is pressed more strongly than the receiving force. The receiving lip is laid down so as to escape into the center packing receiving concave circumferential groove, and is defined so as to allow the feeding pipe of the conduit.

  According to the above configuration of the first aspect, even if the unthreaded conduit is inserted into the connector body from either the front or the rear, the tube end surface strikes against the conduit retaining lip of the center packing. In addition to being received not to be able to penetrate, if further strongly pushed against the receiving force, the conduit packing receiving lip of the center packing escapes into the center packing receiving concave groove of the connector body and falls down, Since the feed pipe of the conduit is allowed, the connection piping work can be performed conveniently, and it is not necessary to give the above-mentioned visible guide arrow of Patent Document 1 to the connection tool (coupling) body.

  The center packing has a substantially T-shaped cross section, and the conduit receiving lip protrudes from the central portion of the inner peripheral surface of the center packing so as to protrude substantially inward at right angles. Even in the fitting operation, it is not necessary to distinguish the directionality, which is extremely convenient in that sense, and the maximum mass production effect can be obtained.

It is a sectional side view which shows the assembly state of the connector for screwless conduits concerning this invention. FIG. 2 is a sectional view taken along line 2-2 of FIG. It is a slope view which extracts and shows a center packing. FIG. 4 is a front view of FIG. 3. FIG. 5 is a plan view of FIG. 4. FIG. 6 is a cross-sectional view taken along line 6-6 of FIG. It is a sectional side view of the operation state in which the conduit tube receiving lip of the center packing receives the tube end surface of the unthreaded conduit tube. It is a sectional side view which shows the feed piping action state from the front with respect to a connector main body. It is side sectional drawing which similarly shows the feed piping action state from the back with respect to a connector main body.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The numerical value is the actual size of the illustrated specification as an example. 1 and 2 show the assembled state of the unthreaded electrical conduit connector (coupling) according to the present invention, and (P) is an unthreaded electrical conduit (cable protection steel tube) with a constant outer diameter. (About 59 mm) and thickness (about 2 mm). (C) is a connector (coupling) body of a zinc alloy die-cast product, which has a certain length (L) (approximately 107 mm) and a certain diameter (D) (approximately 60. 5mm) and is shaped into a nearly cylindrical shape.

  (11), (11), (11), and (11) are a plurality of (four in total in the figure) convex seats that continuously protrude outward by a certain height from the body of the connector main body (C). The screw holes (12), (12), (12), and (12) are formed so as to penetrate from the center thereof in the centripetal direction of the connector main body (C).

  (13) (13) (13) (13) is a presser foot for a conduit tube that is inserted into the screw hole (12), (12), (12), and (12) so as to advance and retract from the outer peripheral direction of the connector main body (C). It is a bolt, and the outer peripheral surface of the unthreaded conduit (P) is pressed and fixed. (14) (14) (14) (14) is the vertical movement of the head of the presser bolt (13) (13) (13) (13) and the convex seat (11) (11) (11) (11). This is a waterproof rubber flat packing interposed therebetween.

  The front and rear end portions of the connector main body (C) have a certain depth from the inner peripheral surface of the connector main body (C) as widened edges (15) and (15) having a diameter slightly larger than the diameter (D) of the trunk. It is cut out by (G1) (about 2 mm). (16) (16) is located in the back part adjacent to the widening edges (15) and (15), and from the widening edges (15) and (15) from the inner peripheral surface of the connector main body (C). The end packing receiving concave circumferential groove cut into a continuous staircase state having a constant depth (G2) (about 3 mm) and a width (W1) (about 5 mm).

  (17) (17) is from the front-rear direction (F) (R) of the connector main body (C) to the inside of the end packing receiving concave circumferential groove (16) (16) through the widening edges (15) (15). A ring-shaped rubber end packing that covers and waterproofs both front and rear ends of the connector body (C) by being fitted, and has a diameter substantially equal to the diameter (D) of the connector body (C) From the inner peripheral surface having the first lip (18) (18) located on the front end side and the second lip (19) (19) juxtaposed on the inner side of the inner lip protrudes substantially inward at right angles and stands upright. Has been.

  In that case, the fixed height (H2) of the second lip (19) (19) protruding from the inner peripheral surface of the connector main body (C) is about 3 mm, and the same as in the first lip (18) (18). It is higher than a certain height (H1) (approx. 1.5 mm), acts in a prone manner with little resistance in any direction (F) or (R), and has no screw from any direction (F) or (R) The conduit (P) can be received in the connector main body (C). Compared to this, the first lip (18) (18) is pressure-bonded to the outer peripheral surface of the conduit (P) with a resistance force that is difficult to lie down, and maintains a stable waterproof effect.

  Further, (20) is located in the middle of the body portion of the connector main body (C), and is depressed by a certain depth (G3) (about 3 mm) and width (W2) (about 10 mm) from the inner peripheral surface thereof. The center packing receiving concave circumferential groove is cut into a state where a ring-shaped center packing (21) as shown in FIGS.

  The center packing (21) is made of rubber which is shallower and thinner (thickness: about 1.5 mm) than the notch depth (G3) of the receiving concave circumferential groove (20), and has a diameter (d) (about 63.5 mm). ) Is slightly larger than the diameter (D) (about 60.5 mm) of the connector main body (C). Moreover, the center packing (21) is provided with a conduit catching lip (22) that protrudes from the center of the inner peripheral surface by a certain height (H3) (about 3 mm) inward and rises substantially at a right angle. It is shaped almost like a T-shape.

  The conduit receiving lip (22) of the center packing (21) protrudes and rises inward by a certain height (H4) (about 1.5mm) from the inner peripheral surface of the connector body (C). Therefore, as shown in FIG. 7, even if the unthreaded conduit (P) is inserted into the connector main body (C) in any direction (F) or (R), the tube end surface of the conduit (P) is received. However, when the conduit (P) is pushed more strongly against the receiving force, the conduit receiving lip (22) is as shown in FIGS. In addition, it is possible to allow a relative feed pipe of the conduit (P) relative to the connector main body (C) by acting overlying so as to escape into the center packing receiving concave circumferential groove (20). Yes.

  (23) shows a stepped portion that is depressed by a difference (S) (about 1.5 mm) between the diameter (d) of the center packing (21) and the diameter (D) of the connector main body (C). The conduit receiving lip (22) escapes into the interior as shown in FIGS.

  Since the connector for a screwless conduit according to the present invention has the above-described configuration, the conduit (P) is placed inside the connector main body (C), as shown in FIGS. ), And the pipe end faces of both conduits (P) can be fixed and maintained in the butt connection piping state as shown in FIG. The waterproof effect at the end face of the tube is also obtained.

(11) · Convex seat (12) · Screw hole (13) · Presser bolt (14) · Flat packing (15) · Expanding edge (16) · End packing receiving concave groove (17) · End packing (18)・ First lip (19) ・ Second lip (20) ・ Center packing receiving concave groove (21) ・ Center packing (22) ・ Conduit receiving lip (23) ・ Step (C) ・ Connector body (P ) ・ Conduit without screw

Claims (1)

In the middle part of the connector body, which has a substantially cylindrical shape corresponding to the unthreaded conduit, cut out a center packing receiving concave groove recessed from the inner peripheral surface by a certain depth,
A ring-shaped center packing made of rubber that is thinner than the notch depth is fitted into the center packing receiving concave groove, and
By shaping the center packing into a T-shaped cross section in which the conduit receiving lip protrudes from the central portion of the inner peripheral surface of the center packing and extends up substantially at a right angle than the inner peripheral surface of the connector main body.
Regardless of whether the unthreaded conduit tube is inserted into the connector main body from either the front or back direction, the conduit tube receiving lip of the center packing receives the tube end surface, and further, the conduit tube is pressed more strongly than the receiving force. A connection tool for a screwless conduit, wherein the receiving lip is laid down so as to escape into the center packing receiving concave circumferential groove so as to permit the feeding pipe of the conduit.

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