JPH06856Y2 - Cable drawer for electrical equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a cable drawing device for electric equipment such as a photoelectric switch and an ultrasonic switch, and is particularly suitable for a case where a cable drawing cylinder including its housing is molded of plastic. .

[Prior art]

Conventionally, as shown in FIGS. 3 and 4, a cable pulling device of this type is provided with a through hole 8 through which a cable 6 is inserted in a side wall 2 of a plastic housing 1, and a cable pulling tube 7 is provided on the side wall. It is provided so as to be concentric with the insertion hole 8. The seal member 9 formed of an elastic material such as rubber has a through hole 10 through which the cable 6 penetrates on its axis, and has an outer diameter substantially equal to the inner diameter of the cable pull-out cylinder 7 at one end side thereof. Large diameter portion 11 having
And a small-diameter portion 12 having a smaller diameter than the large-diameter portion 11 on the other end side, and a fitting portion 13 that fits into the insertion hole 8 at the side end portion of the large-diameter portion 11. Have
The large diameter portion 11 of the seal member abuts the side wall 2 of the housing 1 in a state where the seal member is housed in the cable pull-out cylinder. Further, the bush 15 fitted into the cable pull-out cylinder 7 has a hole 16 on the axis thereof for inserting the small-diameter portion 12 of the seal member 9, and the elastic portion 19 is formed at the end thereof by the notches 18 and 18. , 19 are formed, and a claw portion 21 protruding outward of the bush 15 is formed at the end of this elastic portion. On the other hand, in the cable pull-out cylinder 7, engagement holes 22 and 22 for engaging the claw portions 21 and 21 with the bush 15 accommodated therein are formed symmetrically with respect to the axial center line thereof.

In addition, this conventional example shows one applied to a photoelectric switch,
Therefore, a window 24 is formed on the other side wall 3 of the housing 1, and a lens unit 27 including a holder 25 for holding a light projecting element and a light receiving element (neither of which is shown in the figure) and a lens 26 is attached to this window. To be Leaf spring 28
Is provided between the lens unit and the housing 1 to elastically support the lens unit and also serve as a ground terminal for shielding. Further, the housing 1 accommodates a printed circuit board 29 connected to the cable 6 and forms a switching circuit together with the light projecting element and the light receiving element. If necessary, an operation display element 31 is attached to the printed circuit board 29, and a display window 32 is formed on the other side wall of the housing 1 correspondingly.
Moreover, a translucent cap 33 is fitted into this window. Further, the cover 35 covers the opening of the housing 1. Reference numeral 31 is an elastic piece for shielding.

In FIG. 5, the seal member 9 accommodates the cable 6 in the cable pull-out cylinder 7 with the cable 6 penetrating the through hole 10.
In addition, a state is shown in which the bush 15 is housed in the cable pull-out cylinder, and the claw portions 21 and 21 are engaged with the engagement holes 22 and 22. In this state, the seal member 9 is crushed by the bush 15 and the cable 6 , Thereby fixing the cable to the housing 1 and providing a seal between the housing and the cable 6.

[Problems to be Solved by the Invention] The bush 15 shown in FIGS.
When inserting the cable into the cable pull-out tube 7, it is difficult to align the claw portion 21 with the engaging hole 22, and the workability thereof is poor, and when the bush 15 is pushed into the cable pull-out tube 7, the action of the notch portion 18 acts. Therefore, the bush 15 is easily deformed, and the holding portion thereof is cut off by the elastic portion 19, so that it is small, and this is one of the causes of difficulty in mounting. Further, when the bush 15 is pushed into the cable drawing tube 7, the inner wall of the cable drawing tube and the claw portion 21
It is necessary for the elastic portion 19 to bend in the axial direction thereof, that is, the direction a in FIG. 5, due to the abutment with the above. Therefore, a predetermined gap G must be provided between the cable 6 and the inner wall of the bush 15. The outer diameter of the cable pull-out tube 7 must be increased.

[Purpose of device]

In consideration of such a conventional problem, the present invention facilitates the positioning of the bush when it is inserted into the cable pull-out tube, makes it easy to hold, and is not easily deformed. It is intended to be smaller.

[Outline of device]

In order to achieve the object, the invention provides an engaging projection for engaging with an engaging hole of a cable drawing cylinder on a peripheral wall portion of a bush, and providing a guide groove portion along the axis of the cable drawing cylinder. Further, the outer peripheral wall of the bush is provided with a ridge that fits into the guide groove.

As a result, when the bush is attached to the cable drawing tube, the protrusion of the bush is guided by the guide groove of the cable drawing tube, and the engaging projection engages with the engaging hole.

〔Example〕

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

Note that the description of the same configuration as the conventional configuration will be omitted.

That is, in FIG. 1, the bush 15 is formed in a tubular shape from a material having elasticity, and the outer periphery of the bush 15 has an engaging projection 21 that engages with the engaging hole 22 of the cable pulling-out tube 7 in a direction intersecting the axial center line thereof. Are formed integrally with each other. Further, ridges 41, 41 are formed on the outer periphery of the bush 15 along the axis thereof. Further, a flange portion 43 is integrally formed at the end of the bush 15.

On the other hand, guide groove portions 42, 42 into which the ridge portions 41, 41 are fitted are formed in the cable drawing cylinder 7 along the axis thereof.

In the above structure, those parts are assembled as follows.

That is, as shown in FIG.
This seal member is inserted into the cable pull-out cylinder 7 in a state of being penetrated into the cable pull-out cylinder 7, and then the rib 43 of the bush 15 is held by the guide groove portion 4 of the cable pull-out cylinder 7.
2 and 42, this guide groove allows the protrusion 4
1, 41 are guided, and at the same time, the bush 15 is fitted into the cable drawing cylinder 7. Further, when the bush 15 is inserted into the cable pull-out cylinder 7, the engaging projections 21, 21 engage with the engaging holes 22, 22 of the cable draw-out cylinder 7. In this state, the seal member 9 is compressed and deformed by the bush 15, holds the cable 6, and controls the seal between the cable and the housing 1.

Further, at this time, since the collar portion 43 faces the end surface of the cable pull-out cylinder 7, even if the bush 15 is further pushed in, it is held at that position without advancing further.

[Effect of device]

According to this invention, as described above, the engaging projection 21 that engages with the cable drawing cylinder 7 is provided on the peripheral wall portion of the bush 15, and the protruding wall portion 41 is provided on the peripheral wall portion of the bush 15 along the axis thereof. Since it is provided as an engagement protrusion 21 and an engagement hole 2
The position of 2 is defined by the ridge portion 41 and the guide groove portion 42. Therefore, the engagement protrusion 21 is automatically engaged with the engagement hole 22 by simply fitting the bush 15 into the cable pull-out cylinder 7. Further, unlike the conventional case, it is not necessary to provide a predetermined gap G between the seal member and the bush, so that the bush 15
The pressing area of the sealing member 9 against the sealing member 9 is widened, and the holding force of the cable 6 and its sealing property can be further improved.

Further, at the end portion of the bush 15, a collar portion 43 that abuts against the end surface of the bush 15 when the bush is fitted and inserted into the cable pull-out cylinder 7.
Since the bushes 15 are integrally formed, the bushes 15 themselves are less likely to be deformed, and the bushes are easy to handle, so that the fitting work, particularly the pressing work, with respect to the cable pull-out cylinder 7 is facilitated.

[Brief description of drawings]

FIG. 1 is a divided perspective view showing an embodiment of a cable drawing device for electric equipment according to the present invention, and FIG. 2 is a longitudinal sectional view of the same.
FIG. 3 is a divided perspective view when the conventional device is applied to a photoelectric switch, and FIG. 4 is an exploded perspective view of a main part of the conventional device.
The figure is a vertical sectional view of the same. 1 ... Housing, 2 ... Side wall, 3 ... Side wall, 4 ... Side wall, 6 ...
Cable, 7 ... Cable draw-out tube, 8 ... Insertion hole, 9 ... Seal member, 10 ... Through hole, 11 ... Large diameter part, 12 ... Small diameter part, 13 ... Fitting part, 15 ... Bushing, 16 ... Hole, 21 ...
Engaging protrusions, 22 ... Engaging holes, 41 ... Ridge portions, 42 ... Guide groove portions, 43 ... Collar portions.

Claims (2)

[Scope of utility model registration request] 1. A plastic housing (1) has a side wall provided with an insertion hole (8) through which a cable (6) is inserted, and the side wall of the housing (1) is concentric with the insertion hole (8). Moreover, a cable pull-out cylinder (7) having an inner diameter larger than that of the insertion hole is integrally projected, and a seal member (9) housed in the cable pull-out cylinder and abutting against the side wall of the housing (1) is provided. It is formed of an elastic material, and a through hole (10) through which the cable (6) penetrates is provided on the axis of the seal member,
On the other hand, the bush (15) fitted to the cable pull-out cylinder (7) is provided with a hole (16) on the axial center line for inserting the small-diameter portion (12) of the seal member (9), and the cable In the drawer cylinder (7) provided with at least a pair of engagement holes (22) in a direction intersecting the axis of the drawer cylinder (7), the engagement hole (2) is provided in the peripheral wall portion of the bush (15).
2) and the guide groove (4) along the axis of the cable pull-out cylinder (7).
2) A cable pulling device for an electric device, wherein the bush (15) is provided with a ridge (41) fitted to the guide groove (42) on an outer peripheral wall of the bush (15). 2. A utility model registration in which an end portion of the bush (15) is integrally formed with a collar portion (43) which abuts the end surface of the bush when the bush is fitted into the cable pull-out cylinder (7). A cable withdrawing device for electric equipment according to claim 1.