JPH0940U - Open and close hood sash - Google Patents

Abstract

(57) [Abstract] [Purpose] Manual opening and closing of the sash on the opening surface of the hood [Construction] Suspending the counterweight 9 on the suspension wire 3 of the opening and closing sash 1 makes the vertical movement of the sash light and the braking device. It is used to restrict the freedom of movement of the sash 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention provides a hood (or chamber) with an open / close sash that handles specific chemical substances, organic solvents, radioactive substances, etc., a clean hood (clean bench) that has a sash (door) that uses clean air in the hood, and a gene. The present invention relates to a safety hood with a sash used for rearranging operations.

[0002]

[Prior art]

 Work opening and closing sashes for various hoods installed in laboratories such as research laboratories (schools), hospitals, pharmaceutical companies, factories, etc. are generally guided on the left and right by the pillars on both sides of the work opening, and Hang the wire connected to both ends of the sash on the pulley and attach it to the other end of the sash. I was able to open and close it lightly. At present, the opening and closing handle is provided at the lower end of the sash to open and close the work opening surface by the human power of the worker.

(1) Therefore, when the line of action of the sash opening / closing power of the worker does not pass through the center of gravity of the sash when opening / closing the sash (for example, when trying to open / close by applying force only to the one-sided handle). In the case), the sash tilts and the frictional force between the guide and both sides of the sash becomes large, and thus a larger amount of human power is usually required to open and close the sash. The opening and closing height of the sash will be different compared to normal operation. In rare cases, opening and closing the sash becomes difficult. In some cases, in order to facilitate the opening and closing of the sash, the operator uses both hands to operate the opening / closing handle at the bottom of the sash to balance the sash.

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

(3) When the sash is in a closed state, it is necessary to urgently change or stop various operations while performing various operations such as reaction to a substance for experiment and research, extraction, stirring, etc. 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 device]

 Therefore, in order to solve the above-mentioned problems, the present invention smoothly installs the sash provided on the work opening surface of the hood even when the line of action of human power of the worker does not pass through the center of gravity of the sash when opening and closing the sash. It is also an object of the present invention to provide a hood sash that can be opened and closed lightly and can be stopped at any intermediate opening and closing position and that has an opening and closing mechanism that is not equipped with drive equipment.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention has the respective constituent features as described below. (1) The front edge of the opening / closing sash described above in which the opening for the work is formed by opening the front surface of the hood, and the pillars on the left and right guide both sides to provide the opening / closing sash that can reciprocate in the vertical direction. The other ends of the suspension wires attached to the left and right ends are wound around a drum fixed to a common rotary shaft that is rotatably supported immediately above, and the drum rotary shaft is based on the weight of the open / close sash hanging on the wire. While applying a balance torque of approximately the same magnitude as the generated torque and in the opposite direction, the rotary shaft was connected to a braking device with a light rotational resistance, and forward / reverse drive was made possible by an external force. Characteristic hood opening and closing sash.

[0008]

[Action]

 In the present invention, the work opening surface can be opened and closed relatively easily unless the wire for suspending the sash, the drum around which the wire is wound, the drum rotary shaft bearing, and the counterweight structure are damaged. To open the working opening of the hood, touch the lower edge of the sash or the handle to transfer the force upwards against the inertial force. Wires that are connected to both ends of the upper edge of the sash and that suspend the sash are wrapped around the drum peripheral surface that is fixed to the rotating shaft at the other end, and then the free end is extended to the lower end of the sash. Since a counterweight that is half the weight of the sash is suspended, the balance torque about the same as the torque generated on the drum rotation shaft based on the weight of the sash but in the opposite direction is It is given to the rotary shaft of the drum.

Since such a mechanism is employed, the torque applied to the drum rotation shaft is almost zero in the balanced state. When the wire that suspends the sash is a chain or timing belt-shaped wound conductive member, the drum accordingly adopts a sprocket or a toothed pulley. The above-mentioned sash up / down drum system and the drum, wire, and weight mechanism for giving the balance torque to the drum rotation shaft are effective even if they are mutually independent systems. In short, it suffices if the above-mentioned predetermined balance torque can be applied to the drum rotation shaft.

At this time, the diameters of the sash upper and lower drums and the drum for giving a balance torque to the drum rotation shaft can be mutually changed. 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 up / down drum. Further, the drum, the wire, and the weight mechanism that give a predetermined balance torque can be combined into one set.

The balance torque generating means may be replaced by a spiral spring-shaped spring (constant force spring) formed from a thin strip steel plate. This eliminates the need for weight equipment, reduces the sash movement inertial capacity when opening and closing the sash, and increases the opening and closing acceleration of the sash with the same force, but it is necessary to pay attention to durability performance. There may be. A braking device that generates a light drive resistance is separately 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 opposes the inertial movement of the sash and weight. In combination with the frictional force with the sash guide, the upward movement of the sash is suppressed and stopped. Therefore, the sash stops at this position. Since the weight of the sash itself is canceled by the counter weight (weight), the main resistance that is applied to the hand when the sash is opened and closed is due to the inertial force between the sash and the weight and the resistance of the damping device. .

At this time, since the left and right drums having the same diameter are driven in synchronization by one rotating shaft, the sash does not tilt and move up and down, so that both sides of the sash are particularly supported by the guides. It can be smoothly reciprocated without moving. Just before the sash fully opens the work opening and moves to the top dead center, it may be set in advance so that the lower limit position of the forward and backward movement of the weight can be adjusted, and the inertial force due to the weight may be weakened. As a result, the contact of the sash with the upper limit stopper can be weakened. However, it is necessary to take care so as to reduce the rotating torque based on the counter weight with respect to the drum rotating shaft, and not to put more burden on the braking device. The sash position when the work opening is fully opened is maintained by the braking device connected to the drum rotation shaft.

The drive resistance of the braking device for the drum rotation shaft that is rotated by an external input in conjunction with the vertical movement of the sash by manual operation is not so large as to make it difficult to manually move the sash vertically. When no external force acts on the sash, its movement must be large enough to stop naturally at its 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 work opening, the directions described above and are reversed, and the sash is moved to the bottom dead center position after a substantially similar process.

[0014]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. The structure of each member constituting the embodiment can be easily modified by those skilled in the art within the technical level in the field at the time of the application of the present invention. Therefore, the gist of the present invention should not be limitedly interpreted based on only the specific configuration of the present embodiment without showing any special reason. FIG. 1 is a plan view of an essential part of an embodiment of the present invention, and FIGS. 2 and 3 are cross-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 work opening surface, and 2 is provided vertically on both sides of the opening, and the left and right sides of the sash are supported in their sliding grooves to move the sash 1 up and down. A guide to guide

Reference numeral 3 denotes a pair of wires that are connected to the upper and left edges of the upper edge of the sash 1 to suspend the sash 1. Reference numeral 4 denotes a pair of double drums fixed to a rotating shaft 5 and is a peripheral surface of the drum 4. The wire circumscribing the sash and the perpendicular of the suspension wire 3 of the sash are aligned, and the other end of the wire 3 is wound around the peripheral surface of the drum 4 so that the weight of the sash 1 is passed through the wire 3. It is supported by a drum 4 and a rotary shaft 5. The wire 3 for suspending 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 positions of the drum 4 around which the wire is wound and the drum rotation shaft 5 as needed. 6 is the bearing of the rotary shaft 5. 7 is a wire wound around a double drum 4 having the same diameter, and the other end is hung on a pulley 8 and then a weight (counterweight) 9 having a weight of about 1/2 of the weight of the sash 1 is attached. It is connected.

The torque generated by these weights around the rotating shaft 5 is balanced between the weight of the sash 1 and that of the weight 9. Therefore, the influence of the weight of the sash 1 that acts as a resistance force when the sash 1 reciprocates up and down, excluding its inertia (including the balance weight), is assumed to be zero in this case. ing). That is, unless the acceleration is increased, the sash 1 can be opened and closed lightly. Therefore, it is necessary to reduce the sliding friction between the sash 1 and the guide 2 as much as possible. In the present embodiment, the common rotating shaft 5 causes the upper and right ends of the upper edge of the sash 1 to move up and down, so that the frictional resistance between the left and right sides of the sash 1 and the guide 2 is small, and Work equally.

In this embodiment, the drum 4 is doubled and has the same diameter, but the diameter of the drum 4 on the side around which the wire 7 and the weight 9 are wound and suspended is larger. Good. As a result, the weight of the weight 9 can be made lighter than the reference amount. Further, in this embodiment, the drum 4 is doubled and the wrapping wires are distinguished on the side of the sash 1 and the weight 9 respectively so that the wires do not get entangled. Winding both wires into one and winding it around the circumference of the drum 4 multiple times (about two times, although it may actually be one time depending on the friction coefficient between the drum surface and the wire). It suffices to set the power transmission function between the drum and the wire above a predetermined level.

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

A disc 10 fixed to the rotary shaft 5 is provided with a braking device 12, such as a disc brake, constituted by the disc 10 and a pad 11 biased to press the disc surface at a right angle. Therefore, the rotation of the rotary shaft 5 is constantly braked. The braking force is unbalanced between the torque around the shaft 5 generated by the weight of the sash 1 and the weight 9 for torque balance, the sliding friction caused by the vertical movement of the sash 1, or the weight between the sash 1 and the weight 9 for balancing. It is a size that overcomes inertial force, and is set so that the moving sash 1 will stop naturally on the spot when the external force is cut, or the stopped sash 1 will not start moving naturally. However, it should not appear that opening and closing of the sash 1 is flexible. Therefore, it is preferable to set the braking force so that it can be adjusted appropriately. The disc 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 disc. In this case, the drums 4 at both ends of the rotary shaft 5 can be part of the braking device, and of course, the pad 11 is provided so as to press the side surface of the drum 4. The braking device is not limited to the disc brake, but 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 the details of the operation method and operation of this embodiment having the above-mentioned structure, refer to the detailed description in the section [Operation] described above.

[0020]

[Effect of the invention]

 Since 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, the operation can be performed without any inconvenience, relying only on human power. Therefore, both the manufacturing cost and the 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 available for carrying in the test material. For this reason, the diffusion of harmful substances into the work environment is reduced compared to the case where the sample is once placed on another table and the sash is operated.

(3) By connecting a counter weight that is approximately balanced with the weight of the sash, the up and down movement of the sash is lightened. Therefore, even when the sash is suddenly moved up and down 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, it is easy to stop the sash at the required opening position when loading or unloading the sample. (4) Suspending the upper edge ends of the horizontally long sash with wires, and in order to move the pair of wires up and down synchronously using the drum rotation axis, there is a special space between both sides of the sash and the guide groove. Since there is no support, it can slide up and down extremely smoothly even with a heavy sash. For example, a hood of this type is equipped with a sash opening / closing device having a new structure, and it is possible to obtain special actions and effects that cannot be expected from a conventionally known sash opening / closing device.

[Brief description of 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]

 1 sash 2 sash guide 3 wire 4 drum 5 rotating shaft 6 bearing 7 wire 8 pulley 9 counterweight 10 disc 11 pad 12 braking device.

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 about the same magnitude as the torque generated on the wire based on the weight of the opening / closing sash and in the opposite direction, while connecting the rotating shaft to a braking device having a light rotation resistance, an external force is applied. The sash for opening and closing the hood is characterized by the fact that it can be driven in forward and reverse directions.