JP2501972Y2 - Close contact - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention grips a cable and keeps an insertion port airtight by compressing a sealing member in the cable axial direction and bulging in the cable axial direction. Closely related to hands.

[Prior Art] Conventionally, a packing having a cylindrical inner peripheral surface and a concave groove on the outer peripheral surface is provided between a nipple body and a washer, and a lock nut and a nipple for tightening the packing. There is known an airtight hand that presses the packing on the side of the nipple to bulge it toward the center of the nipple and airtightly grips the cable inserted in the nipple (for example, Japanese Utility Model Publication No. 57-57453).

[Problems to be solved by the invention] However, with the above airtight hand, although the packing swells toward the center of the nipple when pressed, the inner peripheral surface of the packing is merely a curved surface, and the swelled surface is slippery and slippery. Also, the biting into the cable jacket is not enough. Therefore, the airtight hand has a problem that the cable gripping force is weak and a problem that airtightness is poor.

Therefore, the present invention has been made for the purpose of providing an airtight hand that can firmly hold the cable inserted into the insertion port and can keep the insertion port airtight.

[Means for Solving the Problems] The gist of the present invention is to provide an airtight hand body having an insertion port for inserting a cable, an annular seal member for gripping the cable inserted in the insertion port, A stopper provided in the insertion port for stopping the entrance of the seal member at a predetermined position and the stopper is fastened to the insertion port, and the sealing member is sandwiched by the fastening in the cable axial direction. In an airtight hand including a tightening nut that compresses and swells the sealing member in the axial direction of the cable, the sealing member has a predetermined width in the axial direction of the cable and is inscribed in the insertion opening. The outer peripheral surface side is provided with an annular concave groove for assisting the bulging in the axial direction of the cable due to the compression, and at least the concave shape is provided at a position corresponding to the concave groove on the inner peripheral surface side in contact with the cable. The airtight hand is characterized by comprising a stepped groove portion continuously forming a plurality of thread-shaped protrusions at a pitch narrower than the groove width of the groove.

[Operation] According to the airtight hand of the present invention configured as described above, when the seal member is compressed in the cable axial direction by the cooperation of the stopper and the tightening nut, the outer peripheral surface side is inscribed in the insertion opening of the seal member. The concave groove provided in the buckle buckles. Therefore, the seal member bulges in the direction of the cable axis at the concave groove portion.

Further, a step groove portion for continuously forming a plurality of thread-shaped protrusions is provided at a position corresponding to the concave groove on the inner peripheral surface side of the seal member, which contacts the cable, at a pitch narrower than the groove width of the concave groove. Therefore, when the seal member swells, the vertices of the protrusions of the step groove bite into the outer wall of the cable, and the cable is firmly gripped by the seal member so that it cannot move in the axial direction.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

First, FIG. 1 (A) is a sectional view of an airtight hand of an embodiment to which the present invention is applied, and FIG. 1 (B) is a right end view thereof.

As shown in the figure, the airtight hand is mounted on the seal member 3, the tightening nut 5 for pressing the seal member 3, and the seal member 3, and prevents the seal member 3 from being damaged by the rotation of the tightening nut 5. It consists of a ring washer 7,
The limit switch 30 is fitted in an insertion opening 34 provided in a terminal block 32.

The seal member 3 is a tube made of a plastic material, and has a cylindrical sleeve portion 10 that is a main body and a sleeve portion 10
Of the stepped groove portion 12 formed on the inner peripheral surface of the sleeve portion 10 and an annular portion formed at the same circumferential position as the stepped groove portion 12 on the outer peripheral surface of the sleeve portion 10.
Consisting of 14 and. An annular groove portion (concave groove) 16 having a U-shaped cross section is formed in the annular portion 14, and the step groove portion 12 is formed.
Has a plurality of thread-shaped protrusions continuously formed at a pitch narrower than the groove width of the groove portion 16. The inner diameter 1 at the apex of each protrusion of the step groove 12 is slightly smaller than the inner diameter L of the open portion 10a of the sleeve 10.

The tightening nut 5 has a threaded portion 5e having an external thread engraved on its outer peripheral surface and a hexagonal head 5b, and the threaded portion 5a is screwed into a female screw 34a engraved on the inner peripheral surface of the insertion opening 34. By doing so, the entire airtight hand is tightened and fixed to the insertion opening 34.

The ring washer 7 is made of resin and made of a material with good slippage, and is fitted around the sleeve portion 10 of the seal member 3 in an annular manner.
One side surface 14a of the annular portion 14 of the seal member 3 is protected from being damaged by the rotation of the tightening nut 5.

Further, the insertion port 34 of the limit switch 30 is a cylinder erected on the end face of the limit switch 30, and the opening end thereof is
A female screw 34a is engraved on the inner peripheral surface near 36, the inner side of the insertion port 34 is opened to the space in which the screw pedestal 40 of the terminal block 32 is provided, and further insertion of the seal member 3 is prevented. A stopper 42 is provided. The stopper 42 is provided so as to project around the inner wall behind the insertion port 34, and the side surface 42a on the open end 36 side is formed into a tapered surface.

As shown in FIG. 2, when the seal member 3 is tightened by the tightening nut 5 with the above airtight hand, the seal member 3 buckles in the groove portion 16 and the step groove portion 12 bulges toward the center of the insertion port 34.

 Next, a method of using the airtight hand will be described.

First, as shown in FIG. 3 (A), the ring washer 7 is fitted to the seal member 3 and then inserted into the insertion opening 34. Then, the tightening nut 5 is attached to the seal member 3 and the insertion port 34
To fasten. When the tightening nut 5 is rotated in the screwing direction and tightened with a screw, the ring washer 7 abuts on one side 14a of the annular portion 14, and the annular washer 7 is inserted through the annular washer 1.
One side surface 14a of 4 is pressed and the seal member 3 is sent to the inner side of the insertion port 34 (in the direction of the terminal block 32 of the limit switch 30).

Here, as shown in FIG. 3 (B), a three-core cabtire cable C is inserted into the seal member 3, and each terminal Ca, C
b, Cc are screwed to the terminal block 32 of the limit switch 30. When the tightening nut 5 is further rotated, the other side surface 14b of the annular portion 14 contacts the side surface 42a of the stopper 42, and the annular portion 14 is sandwiched between the tightening nut 5, the ring washer 7, and the stopper 42. Pressed. further,
Tighten the head 5b of the tightening nut 5 until it comes into close contact with the open end 36 of the insertion opening 34.

Then, as shown in FIG. 3 (B), in the annular portion 14, the groove portion 16 buckles while the side surface 14 b of the annular portion 14 inclines along the side surface 42 a of the stopper 42, and the stepped groove portion 12 has the center of the insertion opening 34. The plastic deformation while bending in the direction, and bulges toward the center of the insertion opening 34. The insertion port 34 is kept airtight by the bulging sealing material 3 and the cabtire cable C is strongly gripped.

As described above, in this embodiment, when the sealing member 3 is pressed by the tightening nut 5, the step groove portion 12 bends toward the center of the insertion port 34 and induces the swelling of the seal member 3. Bulges into a mountain shape. In addition, the groove 16 is pressed by the tightening nut 5 so that the groove 16 is formed on the side surface of the stopper 42.
Since it buckles in the form of being depressed in the direction along the tapered surface 42a, it assists the step groove 12 to bulge toward the center of the insertion opening 34.

Since a plurality of thread-shaped protrusions are continuously formed in the step groove portion 12 of the seal member 3, the seal member 3
When the bulge rises, the apexes of the ridges of the step groove portion 12 bite firmly into the outer skin of the cabtire cable C, the cabtire cable C is firmly gripped, and the insertion port 34 is kept airtight.

[Effect of the Invention] As described above, in the airtight hand of the present invention,
Airtight hand After inserting the cable into the insertion port of the main body, tighten the tightening nut into the insertion port, the seal member will be compressed between the stopper and the tightening nut, and the concave groove formed on the outer peripheral surface of the seal member The buckling causes the stepped groove portion formed on the inner peripheral surface of the seal member to bend in the axial direction of the cable and bulge into a chevron shape.

Since a plurality of thread-shaped protrusions are continuously formed in the step groove portion at a pitch narrower than the groove width of the concave groove, when the step groove portion bulges into a chevron, each protrusion However, a ring-shaped rib (skeleton) is formed at the apex and slope of the bulged mountain, and the apex of each ridge bites into the outer wall of the cable.

Therefore, according to the airtight hand of the present invention, the circumference of the cable can be firmly gripped by the sealing member, the tensile strength between the airtight hand and the cable can be sufficiently secured, and the insertion port can be kept airtight. You can

[Brief description of drawings]

FIG. 1 (A) is a sectional view of the airtight hand, FIG. 1 (B) is a right end view of the same, FIG. 2 is a sectional view of the airtight hand when the tightening nut is tightened, and FIGS. 3 (A) and (A). B) is an explanatory view of how to use the airtight hand. 3 …… Seal member, 5 …… Tightening nut 7 …… Ring washer, 10 …… Sleeve part 12 …… Step groove part, 14 …… Annular part 16 …… Groove part, 34 …… Insertion port 42 …… Stopper C… ... cabtyre cable

Claims (1)

(57) [Scope of utility model registration request] 1. An airtight hand body having an insertion port for inserting a cable, an annular seal member for gripping a cable inserted in the insertion port, and a predetermined entrance of the sealing member provided in the insertion port. The stopper that is stopped at the position and the insertion opening are tightened, and the sealing member is sandwiched between the stopper and the stopper to compress in the cable axial direction and expand the sealing member in the cable axial core direction. In the airtight hand equipped with a tightening nut to be pulled out, the sealing member has a predetermined width in the axial direction of the cable, and the outer peripheral surface side inscribed in the insertion port has the axial direction of the cable axially compressed by the compression. An annular concave groove for assisting the bulge to the cable is provided, and at a position corresponding to the concave groove on the inner peripheral surface side in contact with the cable, at least a pitch narrower than the groove width of the concave groove is formed. Multiple lines Further comprising a step groove continuously formed, closely hand feel, wherein.