JPH0353388Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a switch mounting device for mounting a switch for detecting the position of a piston to a cylinder tube.

BACKGROUND ART Conventionally, a mounting device for mounting a piston position detection switch on a cylinder tube is disclosed in, for example, Japanese Utility Model Application Publication No. 161420/1983.
To do this, a pair of locking grooves extending in the piston sliding direction are provided on the outer periphery of the cylinder tube, a piston position detection switch is placed on the outer periphery of the cylinder tube, and a pair of mounting brackets are installed to hold both sides of the switch. A device is disclosed in which the tip is fitted into each of the locking grooves and is tightened by a tightening screw attached to a mounting bracket to be crimped onto the inner surface of the locking groove.

Problems to be Solved by the Invention However, the conventional mounting device described above uses only the elastic deformation of the mounting bracket that occurs when the tightening screw is tightened to press the pair of ends of the mounting bracket against the inner surface of the locking groove. Therefore, there was a problem that when a large external force was applied, the mounting bracket could come off the locking groove or be misaligned in the axial direction. Additionally, since the ends of the mounting bracket must be crimped onto the inner surface of the locking groove, the locking groove must be made deeper, which reduces the wall thickness of the cylinder tube. However, there were also problems such as a decrease in the strength of the cylinder tube.

Means for Solving the Problems The present invention was devised to solve the above-mentioned conventional problems, and includes a pair of locking grooves parallel to the sliding direction of the piston on the circumferential surface of the cylinder tube. The locking grooves are formed so as to approach each other as they become deeper, and the plate material is formed in a cross-shaped shape so as to surround the outer periphery of the switch, and the locking grooves are formed in a cross-shaped manner so as to surround the outer periphery of the switch. an internal mounting body in which the parts are elastically deformable in the directions of distance and distance, and locking pieces formed at both ends thereof are formed so as to approach each other so as to be locked in the locking groove, and , a plate material is formed in a cross-shaped shape so as to surround the outer periphery of the internal mounting body, and both ends of the open part are inserted into the locking groove while the plate material is placed over the internal mounting body that is locked in the locking groove. The external mounting body is provided with a nut on an upper plate facing the opening of the internal mounting body, and a tightening screw for pressing the switch is attached to the nut on the upper plate of the external mounting body. is inserted and screwed together, and the tightening screw is provided with a stopper for preventing both ends of the external mounting body from coming out of the locking groove.

Action: After locking the pair of locking pieces of the internal mounting body into the locking grooves of the cylinder tube at the required positions on the cylinder tube, place the external mounting body over the internal mounting body and secure both ends of the locking pieces to the locking grooves of the cylinder tube. Insert it into the groove. Further, a piston position detection switch is inserted into the internal mounting body. In this way, when the tightening screw is screwed into the nut provided on the upper plate of the internal mounting body and tightened, the switch is pressed and fixed to the cylinder tube, and both ends of the external mounting body are held in position within the locking groove. Ru. Both ends of the external mounting body receive elastic deformation of both ends of the internal mounting body outward, and prevent the locking piece from coming off the locking groove.

Embodiments Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

In FIGS. 1 and 2, 1 indicates a cylinder tube (generally also referred to as a cylinder barrel) of a rodless cylinder, and this cylinder tube 1
A piston (not shown) is slidably fitted inside. 3 is a piston position detection switch (hereinafter simply referred to as a switch) for detecting the piston position, and 4 is a code. A pair of locking grooves 2 are provided on one or more (three in this figure) of the circumferential surfaces of the cylinder tube 1 over substantially the entire length of the cylinder tube 1 . A piston mount (not shown) is reciprocatably attached to one surface on the right side of the cylinder tube in FIG. The pair of locking grooves 2 are formed at intervals slightly wider than the lateral width S of the switch 3, or at approximately the same interval as the lateral width S, and are formed so as to approach each other as they become deeper.

Next, 5 is an internal mounting body for mounting the switch 3 to the cylinder tube 1, and an elastic member such as a sheet metal is attached so as to surround the outer periphery of the switch 3.
It is formed into a letter shape. The dimension between the opposite side walls 5b, 5b of the internal mounting body 5 is the same as that of the switch 3.
It is preferable that the width of the switch 3 is approximately the same as the width S of the switch 3 so that there is almost no gap when the switch is inserted, and the vertical dimensions of the side walls 5b and 5b are such that the nut 20 and the pressed member 24, which will be described later, are It is set to a value larger than the height dimension of the switch 3 so that it can be inserted. As shown in FIG. 1, the internal mounting body 5 is integrally provided with locking pieces 8 at both ends of the lower open portion 6, which are bent so as to approach each other so that they can be locked in the locking grooves 2. It is set in. A rectangular nut 20 having a screw hole 19 in the center is attached to the upper plate 5a facing the open portion 6 of the internal mounting body 5. Note that the nut 20 may be simply attached to the inner surface of the upper plate 5a without being attached to the upper plate 5a. A through hole 9 is bored in the upper plate 5a at a position opposite to the screw hole 19.

Next, reference numeral 10 denotes an external mounting body for maintaining the locked state of the internal mounting body 5, which is constructed by forming an elastic member such as a sheet metal into a square shape so as to surround the outer periphery of the internal mounting body 5. There is. In FIG. 1, the lower side of the external mounting body 10 is formed with an inclined part 13 which is inclined from the outside toward both ends 12 of the open part 11 thereof. The external mounting body 10 connects the locking piece 8 to the locking groove 2.
When it is placed over the internal mounting body 5 which is locked to the internal mounting body 5, both ends 12 of the open portion 11 face into the locking groove 2. Both ends 12 of the external mounting body 10 act to prevent the locking piece 8 of the internal mounting body 5 from coming off the locking groove 2, and face the locking groove 2 with almost no gap, and are themselves part of the locking groove 2. In FIG. 1, deformation in the left-right direction is prevented by the inner surface of the locking groove 2. Both ends 12 are locking pieces 8
It is sufficient that the locking groove 2 faces into the locking groove 2 to an extent that can prevent it from coming off from the locking groove 2, and there may be some play in the groove width direction of the locking groove 2. A through hole 15 is bored in the upper plate 10a facing the open portion 11 of the external mounting body 10 at a position facing the screw hole 19. 16 is a tightening screw for pressing the switch 3 against the cylinder tube 1. This tightening screw 1
6 is provided with a stopper 17 that prevents both ends 12 of the external attachment body 10 from coming out of the locking groove 2. Tightening screw 16 in the present invention
In this case, a cross-recessed pan head screw or a hexagonal socket head screw with an integral stopper 17 is used.
The tightening screw 16 passes through the through holes 9 and 15 and is screwed into a threaded hole 19 of the nut 20.

Further, in FIG. 2, a recess 3a is formed on the upper surface of the switch 3. A pressed member 24 consisting of a plate 22 and rubber 23 which are adhered to each other is adhered to the upper surface of the recess 3a, so that the plate 22 is directly pressed by the tightening screw 16. Note that the pressed member 24 may be simply placed on the switch 3 without being glued to the switch 3, or may be configured by making the upper wall of the switch 3 thicker, or may be used as a flat plate only. You may do so.

The present invention has the structure as described above, but the tightening screw 16 strongly presses the pressed member 24 and the switch 3
In order to be firmly fixed to the cylinder tube 1, when the tightening screw 16 is tightened, the stopper 17 must be
The axial length of the tightening screw 16 and the external mounting body 10 are adjusted such that the axial length of the tightening screw 16 and the external mounting body 10 are just in contact with the upper plate 10a of the external mounting body 10, or there is a slight gap between them.
The vertical dimension of is set.

Next, the effect will be explained.

A pair of locking pieces 8 of the internal mounting body 5 are respectively locked in the locking grooves 2 of the cylinder tube 1 at an arbitrary switch mounting position of the cylinder tube 1, and the external mounting body is mounted so as to cover the internal mounting body 5. Both ends 1 of 10
2 into the locking groove 2, and put the switch 3 into the internal mounting body 5. After that, the tightening screw 16 is screwed into the screw hole 19 of the nut 20 through the through holes 9 and 15, and when the tightening screw 16 is turned and tightened, the tip of the tightening screw 16 presses the plate 18. At the same time, the rubber 19 is compressed. This results in
The switch 3 is pressed and fixed to the cylinder tube 1. As a result, even if the cylinder tube 1 is subjected to vibration or a force in the piston sliding direction is applied to the switch 3, the switch 3 can be stably held at the mounting position. In the above case, the vertical movement of the external mounting body 10 is restricted by the stopper 17 in FIG. Even if a large force is applied in the withdrawal direction, the locking piece 8 can be prevented from coming off the locking groove 2. Therefore, the tightening of the tightening screw 16 can be strengthened, and the pressure of the switch 3 against the cylinder tube 1 can be strengthened. As a result, even if a large external force is applied to the switch 3 in the axial direction, its position can be sufficiently maintained. Further, the locking groove 2 serves its purpose as long as it has a depth capable of locking the internal mounting body 5, and therefore, the depth of the locking groove 2 can be made extremely small.

It should be noted that the locking groove 2 may be formed so as to have a locking part 2a on the inner groove edge, for example, the third groove.
As shown in the figure, it may be formed into an L-shaped groove in cross section. Of course, the switch mounting device of the present invention can also be applied to a cylinder having a piston rod.

Effects of the invention As described above, in the present invention, the locking pieces of the internal mounting body are respectively locked in the pair of locking grooves of the cylinder tube, and the switch is inserted into the internal mounting body to mount the switch externally. By inserting both ends of the body into the locking grooves and then pressing the switch with the tightening screw, the switch can be firmly tightened to the cylinder tube, and the switch can be placed at any position on the cylinder tube. Can be fixed securely. In addition, since both ends of the external mounting body can be maintained in the locking groove by the stopper of the tightening screw, the locking piece will not come off from the locking groove even if a large external force is applied to the switch. can be prevented at both ends of the external mounting body, allowing the switch to remain fixed. In addition, even if the amount of engagement between the locking piece and the locking groove is small, the locking piece can be prevented from coming off the locking groove, so the locking groove of the cylinder tube can be made shallow and the cylinder tube flesh pressure can be prevented. This has the effect of increasing the thickness of the cylinder tube and increasing the strength of the cylinder tube.

[Brief explanation of the drawing]

FIG. 1 is a front view showing one embodiment of the switch mounting device of the present invention, FIG. 2 is a sectional view taken along the line -- in FIG. 1, and FIG. 3 is a partial view showing a different example of the locking groove. 1... Cylinder tube, 2... Locking groove, 3...
... Piston position detection switch, 5 ... Internal mounting body, 5a ... Upper plate, 6, 11 ... Opening part, 8 ...
Locking piece, 10...external mounting body, 10a...upper plate,
12... Both ends, 16... Tightening screw, 17... Stopper, 20... Nut.

Claims (1)

[Scope of utility model registration request] In a switch mounting device for mounting a piston position detection switch on a cylinder tube, a pair of locking grooves parallel to the piston sliding direction are formed on the circumferential surface of the cylinder tube with an interval wider than the horizontal width of the switch, and the locking grooves are The stop grooves are formed so that they approach each other as they become deeper, and the plate material is formed in a cross-shaped shape so as to surround the outer periphery of the switch, and both ends of the open portion are elastically deformable in directions toward and away from each other. An internal mounting body is provided, and locking pieces formed close to each other so as to be able to be locked in the locking grooves are provided at both ends of the internal mounting body, and a plate material is provided to surround the outer periphery of the internal mounting body. ni〓
an external mounting body formed in a letter-like shape and having both ends of the open part thereof facing into the locking groove, and further provided with a nut on the upper plate facing the open part of the internal mounting body, A tightening screw that presses the switch is inserted through the upper plate of the external mounting body and screwed into the nut, and a stopper is provided on the tightening screw to prevent both ends of the external mounting body from being pulled out. A switch mounting device characterized by comprising: