JP2006105675A - Sealed structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To propose a sealed structure in a simplified structure for preventing water and dust from entering without generating resistance, for example, for blocking rotation. <P>SOLUTION: In the sealed structure, having a pedestal 1, a casing 2 rotatably connected to and retained by the pedestal 1, and a sealing member 3 that is arranged at the connection part between the pedestal 1 and the casing 2 and prevents water from entering from a part between them, the sealing member 3 is composed of a doughnut-like thin sheet, having an inner end 3a that has a diameter (d) being smaller than an outer diameter D of the pedestal 1 and is fitted to and retained by the outer-periphery surface of the pedestal 1, and an outer end 3b that is brought into contact with the inner-periphery surface of the casing 2 and allows the end to slide on the inner-periphery surface following the rotation of the casing 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a seal structure, and is intended to reliably avoid the intrusion of water from between a base and a casing rotatably held by the base. An explanation will be given by taking a laser marking device frequently used in the field as an example.

  Recently, laser marking machines that receive laser beams emitted from irradiators at a distance from each other are widely used in the marking process that is performed on the construction or civil engineering sites. This has enabled accurate and efficient work.

  Among the above-mentioned ink dischargers, the laser irradiator is fixed to the floor surface via a tripod, and is mounted on the base so as to be rotatable, and is used for irradiating the inside with laser light. It consists of a casing with built-in parts.

  By the way, in order to smoothly rotate the casing on the base in a fixed state, it is indispensable that a certain clearance is provided between the devices of this type. There was concern about the intrusion of dust, and a solution was desired.

Prior art in this regard includes a fixing member, a rotating member that rotates above the fixing member, a fitting that is rotatably fitted to the fixing member, and has a convex portion on the outer periphery and is fastened to the fixing member by a pressing member. With respect to the surveying instrument provided with the tightening ring, the rotating member and the tightening ring are both brought into contact with the rotating member and the tightening ring over the entire circumference, or fixed to one of them and the other is in contact with the other. The thing of the structure which has arrange | positioned the waterproof member formed in cyclic | annular form is proposed (for example, refer patent document 1).
No. 7-25619

  By the way, the above-mentioned conventional structure has a large number of parts, the structure is complicated, and the disassembly and assembly are complicated, and the structure in which the fixed member and the rotating member are brought into contact with each other with a certain degree of strength is adopted. Inevitably, the resistance during rotation is large, and the fine adjustment mechanism required in the inking operation does not work, leaving room for improvement.

  An object of the present invention is to propose a seal structure having a high waterproof and dustproof effect that has a simple structure and can avoid the above-described adverse effects.

The present invention includes a base, a casing that is rotatably connected to the base, and a seal member that is disposed at a connection portion between the base and the casing and prevents water from entering between the base and the casing. ,
The seal member has a smaller diameter than the outer shape of the base, and has an inner end that fits on the outer peripheral surface of the base, and an end edge that comes into contact with the inner peripheral surface of the casing and rotates with the casing. A seal structure comprising a doughnut-shaped thin sheet having an outer end that slides on the inner peripheral surface.

  In the seal structure having the above-described configuration, the thin sheet is preferably made of a stretchable material that directs the entire thin sheet obliquely downward in the radial direction by fitting to the outer peripheral surface of the base.

  The base may be provided with an inclined groove portion that contacts the sheet surface of the thin sheet and guides the thin sheet.

  When the inner end of the seal member is fitted and held on the outer peripheral surface of the base and the outer end is brought into contact with the inner peripheral surface of the casing, the tip slides on the inner peripheral surface of the casing as the casing rotates. As long as the seal member slides, the seal member is maintained in a liquid-tight state.

  Further, since the seal member stops in contact so that the tip of the seal member slides with respect to the casing, it does not cause a large resistance that hinders the rotation of the casing.

Hereinafter, the present invention will be described more specifically with reference to the drawings.
FIG. 1 schematically shows an inking laser irradiator to which a seal structure according to the present invention is applied.

  In the figure, reference numeral 1 denotes a base placed on the floor surface via a tripod or the like. A groove portion 1a for arranging a seal member is provided on the outer peripheral surface of the base 1, and a ring 1b constituting a bearing is arranged therein.

  Reference numeral 2 denotes a casing that is rotatably connected to the base 1. The casing 2 is provided with a device for irradiating a laser beam, and a base 2a that is fitted into the ring 1b of the base 1 and rotatably holds the casing 2 is incorporated.

  Reference numeral 3 denotes a seal member which is disposed at a connection portion between the base 1 and the casing 2 and prevents intrusion of water or the like from between them.

  As shown in FIG. 2, the external perspective view of the sealing member 3 is a doughnut-shaped thin sheet having an inner diameter d smaller than the outer diameter D of the base 1 (corresponding to the bottom diameter of the groove 1a). An inner end 3 a fitted and held on the outer peripheral surface of the base 2, and an outer end 3 b that abuts the inner peripheral surface of the casing 2 and slides the end edge on the inner peripheral surface as it rotates. And have.

  When the sealing member 3 configured as described above is attached to the base 2, the outer end 3 b of the sealing member 3 slides while maintaining a liquid-tight state on the inner peripheral surface of the casing 2 when the casing 2 is rotated. Therefore, even if there is a gap between the base 1 and the casing 2, water, dust, etc. will not enter.

  If the sealing member 3 is made of a material such as Teflon (registered trademark), polypropylene, polyethylene, polyoxymethylene, vinyl chloride, elastomer, or rubber or the like as a material, the sealing member 3 is fitted into the groove 1a of the base 1 When this is done, the inner end 3a of the seal member 3 is pushed and widened, so that the entire seal member 3 can be oriented obliquely downward in the radial direction as shown in FIG. Since a return effect (check valve effect) can be provided, the sealing performance is further enhanced.

  When the seal member 3 is attached to the base 1 so that the seal member 3 is oriented obliquely downward in the radial direction as described above, the groove 1 a is inclined in advance so that the seal member 3 can be stably fitted and held on the base 1. Is formed.

  3 and 4 show another embodiment of the seal structure according to the present invention. As shown in FIG. 1 above, the seal member 3 does not necessarily have to be oriented obliquely downward in the radial direction, and can be mounted in a horizontal state with the outer diameter D of the base 1 and the inner diameter d of the seal member 3 being the same. it can.

  In particular, when there is a concern that a high external pressure is applied to the seal member 3, the casing 2 is provided with a receiving portion 2a that comes into contact with the surface of the seal member 3 as shown in FIG.

  When the sealing member 3 is deformed in an umbrella shape to obtain a waterproof effect, the outer diameter (bottom diameter of the groove 1a) D of the base 1 is smaller than the inner diameter d of the sealing member 3, and the inner diameter of the casing 2 is the sealing member 3. The outer diameter should be the same as or larger than the outer diameter. In particular, if the sealing member 3 is made of a flexible material, the sealing member 3 can be easily deformed by itself, so that there is an advantage that a strict dimensional tolerance is not required.

  The seal member 3 can be formed in an umbrella shape in advance, and this point is not limited.

  It is possible to provide a simplified seal structure having a structure capable of reliably preventing water and dust from entering without hindering the rotation of the rotating member (casing).

It is the figure which showed embodiment of the seal structure according to this invention. It is an external appearance perspective view of a sealing member. It is the figure which showed the other example of the seal structure according to this invention. It is the figure which showed the other example of the seal structure according to this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base 1a Groove part 1b Ring 2 Casing 2a Receiving part 3 Seal member 3a Inner end 3b Outer end

Claims (3)

A base, a casing that is rotatably connected to the base, and a seal member that is disposed at a connection portion between the base and the casing and prevents water from entering between the base and the casing,
The seal member has a diameter smaller than the outer diameter of the base, and is brought into contact with the inner end fitted and held on the outer peripheral surface of the base and the inner peripheral surface of the casing. A seal structure comprising a doughnut-shaped thin sheet having an outer end whose end edge slides on the inner peripheral surface.   The seal structure according to claim 1, wherein the thin sheet is made of a stretchable material that causes the entire thin sheet to be inclined obliquely in the radial direction by fitting to the outer peripheral surface of the base.   The seal structure according to claim 1, wherein the base has an inclined groove portion that contacts the sheet surface of the thin sheet and guides the thin sheet.

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