JP3075040U - Hood opening and closing sash - Google Patents

Abstract

(57) [Summary] [Purpose] Manual opening / closing of a sash on the hood opening surface [Configuration] Hanging a counterweight 9 on a hanging wire 3 of an opening / closing sash 1 to reduce the vertical movement of the sash, To restrict the freedom of movement of the sash 1.

Description

[Detailed description of the invention]

[0001]

[Industrial applications]

 The present invention provides a hood (or chamber) with an openable sash that handles specified chemicals, organic solvents, radioactive materials, etc., a clean hood (clean bench) with a sash (door) that uses the hood as clean air, and a gene. It relates to a safety hood with a sash used for recombination operations.

[0002]

[Prior art]

 The sashes for opening and closing the working openings of various hoods installed in laboratories and laboratories at research laboratories (schools), hospitals, pharmaceutical companies, factories, etc. are generally guided left and right by pillars on both sides of the working openings, and A wire connected to both ends of the sash is hung on a pulley, and a counterweight (weight) that is approximately equal to half of the total weight of the sash is attached to the other end of the wire, and the wire is vertically moved. It was designed to open and close lightly. At present, an opening / closing handle is provided at the lower end of the sash to open and close the work opening surface by human power.

(1) Therefore, when the sash is opened and closed, the line of action of the operator's sash opening and closing power does not pass through the center of gravity of the sash (for example, an attempt is made to apply only one side handle to open and close the sash). The sash tilts and the friction between the guide and both sides of the sash increases, usually requiring more human power to open and close the sash. The opening and closing height of the sash is different compared to normal operation. In rare cases, opening and closing the sash becomes difficult. In general, in order to easily open and close the sash, the operator uses both hands to operate the opening and closing handle at the lower end of the sash to balance the sash and move the sash up and down.

(2) In the work of handling other substances such as a specific chemical substance, an organic solvent, a radioactive substance, etc., when the sample is moved from another place and put in the hood for experimentation and research, the work of the hood is performed. When the sash provided on the opening surface was closed or the sash opened at an incomplete height to carry the substance to be handled into the hood, the worker once placed the substance to be handled in the hood and placed it near the hood. The hood sash must be opened with both hands after placing it on the workbench (lab bench). When the above procedure is followed, if there is a substance that evaporates or evaporates in the sample placed on the work table, the sample will remain in the air of the working environment (laboratory) while it is placed on the work table. There is a possibility that the substance is scattered and diffused to deteriorate the working environment.

[0005] (3) When the sash is in a closed state, while performing various operations such as reaction, extraction, and stirring with respect to a substance for experiments and research, it is necessary to urgently change or stop the operations. In this case, if the sash cannot be opened and closed smoothly, an accident may occur. There is such a problem.

[0006]

[Problems to be solved by the invention]

 In order to solve the above-mentioned problems, the present invention uses a sash provided at the work opening of the hood, so that even when the line of action of the human power of the operator does not pass through the center of gravity of the sash when opening and closing the sash, It is another object of the present invention to provide a hood opening / closing sash having an opening / closing mechanism that does not have a driving device and can be opened and closed lightly and can be stopped at an arbitrary intermediate opening / closing position.

[0007]

[Means for Solving the Problems]

 The present invention has the following components in order to achieve the above object. (1) Opening the front of the hood to form a working opening, and having an open / close sash guided on both sides by left and right pillars and capable of reciprocating vertically, the upper edge of the open / close sash described above. The other ends of the hanging wires attached to the left and right ends are wound around a drum fixed to a common rotating shaft supported directly above, respectively, and the drum rotating shaft is mounted on the basis of the weight of the opening / closing sash hanging on the wire. While applying a balance torque having substantially the same magnitude as the generated torque and rotating in the opposite direction, the rotating shaft is connected to a braking device having a light rotating resistance, and forward / reverse drive is enabled by an external force. Hood opening and closing sash.

[0008]

[Action]

 In the present invention, the work opening surface can be relatively easily opened and closed as long as the wire for suspending the sash and the drum around which the sash is wound, the drum rotating shaft bearing, and the counterweight structure are not damaged. Touch the lower edge or handle of the sash to open the working opening in the hood and transmit the force upwards against the inertial force. The wires connected to both ends of the upper edge of the sash and hanging the sash are wound around the other end of the wire around the drum fixed to the rotating shaft, and then extended at the free end, and the sash is attached to the lower end. Since the weight of the counterweight is approximately half of the weight of the sash, the balance torque in the opposite direction, which is approximately the same as the torque generated on the drum rotating shaft based on the weight of the sash, is described above. It is given to the drum rotation axis.

Since such a mechanism is employed, the torque applied to the rotating shaft of the drum is almost zero in a balanced state. When the wire for suspending the sash is a chain or timing belt-shaped winding conductive member, the drum employs a sprocket or a toothed pulley accordingly. The above-mentioned sash vertical drum system and the drum, wire, and weight mechanism for applying a balance torque to the drum rotating shaft are also effective even if they are mutually independent systems. In short, it is only necessary that the above-mentioned predetermined balance torque can be applied to the drum rotating shaft.

[0010] At this time, the diameter of the sash vertical drum and the diameter of the drum for applying the balance torque to the drum rotating shaft can be changed mutually. That is, the weight of the counterbalance weight can be reduced by making the diameter of the drum for giving the balance torque to the drum rotation shaft larger than that of the sash vertical drum. Further, the drum, wire, and weight mechanism for giving a predetermined balance torque can be combined into one set.

The above-mentioned balance torque generating means can be replaced by a mainspring (constant load spring) in which a thin steel strip is formed into a spiral spring shape. This eliminates the need for weight equipment, reduces the inertia capacity of the sash when opening and closing the sash, and increases the opening and closing acceleration of the sash with the same force. There may be. A separate braking device that generates light driving resistance is connected to the drum rotation shaft to brake the rotation of the drum rotation shaft, and when the hand is released from the sash, it counters the movement inertia force of the sash, weight, etc. In addition, the upward movement of the sash is suppressed and stopped in combination with the frictional force between the sash guide and the sash guide. The sash then stops at that position. Since the weight of the sash itself is canceled by the counterweight (weight), the main resistance to the hand when opening and closing the sash is generated by the inertial force between the sash and the weight and the resistance of the control device. .

At this time, since the left and right drums are driven synchronously by one rotating shaft, the sash does not tilt and move up and down. Therefore, both sides of the sash are particularly engaged with the guide. It can reciprocate smoothly without any problem. Immediately before the sash fully opens the working opening and moves to the top dead center, it may be set in advance so that the lower limit of the forward and backward movement of the weight can be adjusted, and the inertia force by the weight may be reduced. As a result, the contact of the sash with the upper limit stopper can be reduced. However, it is necessary to take care not to reduce the rotation torque based on the counterweight for the drum rotation axis and to place a heavy load on the braking device. The sash position when the working opening is fully opened is held by a braking device connected to the drum rotation shaft.

[0013] The driving resistance of the braking device of the drum rotating shaft, which is rotated by an external input in conjunction with the manual movement of the sash, is not large enough to make it difficult to manually move the sash up and down. If no external force is applied to the sash, the movement must be large enough to stop naturally at the current position. It is desirable that the braking resistance of the braking device can be adjusted as needed. When it is desired to close the working opening, the direction described above is reversed, and the sash is moved to the bottom dead center position through substantially the same process.

[0014]

【Example】

 An embodiment of the present invention will be described below with reference to the accompanying drawings. Therefore, the gist of the present invention should not be limitedly interpreted based on only the specific configuration of the present embodiment without showing a special reason. FIG. 1 is a plan view of an essential part of the embodiment of the present invention, and FIGS. 2 and 3 are sectional views taken along arrows AA and BB in FIG. 1, respectively. Is a sash that reciprocates up and down to open and close the hood working opening surface. 2 is a vertical sash provided on both sides of the opening and supports the left and right sides of the sash in its sliding groove to move the sash 1 up and down. A guide to guide you

Reference numeral 3 denotes a pair of wires connected to the upper left and right ends of the sash 1 to suspend the sash 1. Reference numeral 4 denotes a pair of double drums fixed to a rotating shaft 5. The line circumscribing the sash coincides with the perpendicular of the suspension wire 3 of the sash, and the other end of the wire 3 is wound around the drum 4 so that the weight of the sash 1 is And is supported by a drum 4 and a rotating shaft 5. The wire 3 for hanging the sash 4 can be provided with a direction changing pulley between the sash and the drum 4. This makes it possible to move the mounting position of the drum 4 around which the wire is wound and the drum rotating shaft 5 as necessary. 6 is a bearing for the rotating shaft 5. Reference numeral 7 denotes a wire wound around the double drum 4 having the same diameter. The other end of the wire is wound around a pulley 8, and then is attached to a weight (counter weight) 9 having a weight approximately half the weight of the sash 1. Connected.

The torque generated by these weights around the rotation axis 5 balances the torque based on the weight of the sash 1 and the torque based on the weight 9. Therefore, the influence of the weight of the sash 1 that becomes a resistance when the sash 1 reciprocates up and down does not exclude its inertia (including the balance weight) (in this case, it is assumed that the frictional resistance of each part is zero). ing). That is, as long as the acceleration is not increased, the sash 1 can be opened and closed lightly. For that purpose, it is necessary to reduce sliding friction between the sash 1 and the guide 2 as much as possible. In this embodiment, the upper and left ends of the sash 1 are moved up and down by the common rotary shaft 5 so that the frictional resistance between the left and right sides of the sash 1 and the guide 2 is small. Work equally.

In the present embodiment, the drum 4 is formed to have the same diameter as a double, but the diameter of the drum 4 on which the wire 7 and the weight 9 are wound and suspended is larger. Is also good. This makes it possible to make the weight 9 lighter than the reference amount. Further, in the present embodiment, the drum 4 is doubled, and the wound wires are distinguished into the sash 1 and the weight 9 side, respectively, so that the wires are not entangled. Wraps both wires together and winds them around the circumference of the drum 4 multiple times (about twice, depending on the coefficient of friction between the drum surface and the wires, but in practice it can be wound once) It is only necessary to set the power transmission action between the hook and the drum and the wire at a predetermined level or more.

As another means, a rotating torque mechanism using a constant load spring (for example, Conston) may be provided instead of the torque balance using the weight 9 for the drum 4. In short, the shaft 5 is provided with a means for canceling the torque around the rotating shaft 5 caused by the weight of the sash 1. Therefore, it is not always necessary to provide two torque balance weights 9.

Reference numeral 10 denotes a disk fixed to the rotating shaft 5, and a braking device 12, for example, a disk brake, comprising the disk 10 and a pad 11 urged to press the disk surface at right angles, is installed. Thus, the rotation of the rotary shaft 5 is constantly acted on. The braking force is generated by the imbalance between the torque around the shaft 5 caused by the weight of the sash 1 and the torque balance weight 9, the sliding friction related to the vertical movement of the sash 1, or the friction between the sash 1 and the balance weight 9. It is a size that overcomes the inertia force, and is set so that the moving sash 1 stops naturally on the spot when the external force is cut, or the stopped sash 1 does not start moving naturally. However, the opening and closing of the sash 1 must not seem light. Therefore, it is preferable to set the braking force so that it can be appropriately adjusted. The disk 10 constituting the braking device 12 does not need to be separately set, and the same effect can be obtained even if the side surface of the drum 4 fixed to the rotating shaft 5 functions as a disk. In this case, the drums 4 on both ends of the rotating shaft 5 can be part of the braking device, and, of course, the pads 11 are provided to press the side surfaces of the drum 4. The above-described braking device is not limited to the disc brake, and the same effect can be obtained by using a drum brake. The device only needs to brake the rotation of the drum rotation shaft 5. For details of the operation method and operation of this embodiment having the above-described structure, refer to the detailed description in the section of [Operation] described above.

[0020]

[Effect of the invention]

 The present invention has the configuration and operation as described above. (1) No power (external power, etc.) is required for opening and closing the sash. In short, operation can be performed without relying on inconvenience by relying only on human power. Therefore, both manufacturing cost and running cost are economical. (2) The sash can be opened and closed lightly with only one hand, and the hood can be used even when one hand is not open for carrying test materials. For this reason, the diffusion of harmful substances into the working environment is reduced as compared with a case where the sample is once placed on another table and the sash is operated.

(3) The weight of the sash is connected to a counterweight that balances substantially, so that the sash can be moved up and down lightly. Therefore, even when the sash is moved up and down quickly by human power in an emergency, relatively large resistance is not generated, and the opening and closing operation can be easily performed by human power. In addition, the sash can be easily stopped at a required opening position when a sample is taken in and out. (4) Both ends of the upper edge of the horizontal sash are suspended by wires, and the pair of wires are moved up and down synchronously using a drum rotation shaft. Since there is no support, even a heavy sash can slide up and down very smoothly. For example, this type of hood is provided with a sash opening / closing device having a novel configuration, and can provide special functions and effects that cannot be expected from a conventionally known sash opening / closing device.

[Submission date] September 1, 1998 (1998.9.1)

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

[0007]

[Means for Solving the Problems]

The present invention has the components as described in order to achieve the above object. (1) Opening the front of the hood to form a working opening, and having an open / close sash guided on both sides by left and right pillars and capable of reciprocating vertically, the upper edge of the open / close sash described above. the other end of the suspension wire attached to the left and right ends, with wound around a drum fixed to the common axis of rotation which is rotatably supported directly above each the rotation axis of the drum, the weight of the closing sash applied to the wire Applying a balance torque of substantially the same magnitude and in the opposite direction as the torque resulting from the above, while connecting said rotating shaft to a device which generates a braking force against the torque which is intended to rotate coaxially ; A hood opening / closing sash characterized by enabling forward / reverse drive by external force.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

[0008]

[Action]

In the present invention, the work opening surface can be relatively easily opened and closed as long as the wire for suspending the sash, the drum around which the sash is wound, the drum rotating shaft bearing, and the counterweight structure are not damaged. Touch the lower edge or handle of the "sash" to open the hood working opening and transmit force upwards against inertia. Wires connected to both ends of the upper edge of the sash and hanging the sash are wound around the other end of the sash around the drum surface fixed to the rotating shaft, and the free end thereof is extended and the sash is attached to the lower end. Since the weight (counter weight) of 1/2 is suspended (in the case of this embodiment) , the torque generated on the drum rotating shaft based on the weight of the sash is substantially the same as that of the sash. The balance torque in the opposite direction is applied to the drum rotation shaft. However, the number of the weight (counterweight), as long as that Sosu the action as a whole, may be combined into one, can also be divided.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

[0011] Apart from the drum axis of rotation, when braking the rotation of the drum rotation axis by connecting a braking device that occurs the braking force to the torque to rotate the coaxial, remove your hand from the sash, The lifting movement of the sash is suppressed and stopped in combination with the frictional force between the sash and the sash guide against the inertia of the sash and the weight. The sash then stops at that position. Since the weight of the sash itself is canceled by the counterweight (weight), the main resistance applied to the hand when opening and closing the sash is generated by the inertial force between the sash and the weight and the resistance of the braking device.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction contents]

Reference numeral 10 denotes a disk fixed to the rotating shaft 5. A braking device 12, for example, a disk brake, comprising the disk 10 and a pad 11 urged so as to press the disk surface at right angles, is installed. Therefore, it always acts for the purpose of braking the rotation of the rotating shaft 5. The braking device, when the speed reduction mechanism and the electric motor in the automatic opening and closing means has blackout, influence the mechanism for rotating shaft 5, also serves for because it only has to replace the necessarily limited to disc brakes is not. The braking force is generated by the imbalance between the torque around the shaft 5 caused by the weight of the sash 1 and the torque balance weight 9, the sliding friction related to the vertical movement of the sash 1, or the friction between the sash 1 and the balance weight 9. It is a size that overcomes the inertial force, and is set so that the moving sash 1 stops naturally on the spot when the external force is cut, or the stopped sash 1 does not start moving naturally. However, the opening and closing of the sash 1 must not seem light. Therefore, it is preferable to set the braking force so that it can be appropriately adjusted. The disk 10 constituting the braking device 12 does not need to be separately set, and the same effect can be obtained even if the side surface of the drum 4 fixed to the rotating shaft 5 functions as a disk. In this case, the drums 4 on both ends of the rotating shaft 5 can be part of the braking device, and, of course, the pads 11 are provided to press the side surfaces of the drum 4. The above-mentioned braking device is not limited to the disc brake, but is also effective when a drum brake is employed. The device only needs to brake the rotation of the drum rotation shaft 5. For details of the operation method and operation of this embodiment having the above-described structure, refer to the detailed description in the section of [Operation] described above.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of an embodiment of an automatic opening / closing sash of the present invention.

FIG. 2 is a front sectional view taken along the line AA in FIG.

FIG. 3 is a side sectional view taken along the line BB in FIG. 1;

[Explanation of symbols]

 Reference Signs List 1 sash 2 sash guide 3 wire 4 drum 5 rotating shaft 6 bearing 7 wire 8 pulley 9 weight (counter weight) 10 disk 11 pad 12 braking device.

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[Procedure amendment]

[Submission date] September 1, 1998 (1998.9.1)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims for utility model registration

[Correction method] Change

[Correction contents]

[Utility model registration claims]

Claims (1)

[Utility model registration claims] 1. An opening for opening a front surface of a hood to form a working opening, and an opening / closing sash which is guided on both sides by left and right pillars and which can reciprocate vertically, wherein an upper edge of the opening / closing sash is provided. The other ends of the hanging wires attached to the left and right ends are wound around a drum fixed to a common rotation shaft supported directly above, respectively, and the drum rotation shaft is
While applying a balance torque of substantially the same magnitude as the torque generated based on the weight of the opening / closing sash applied to the wire and rotating in the opposite direction, while connecting the rotating shaft to a braking device having a light rotating resistance, A hood opening / closing sash characterized in that the hood can be driven forward and reverse.