Source: http://www.google.com/patents/US7022151?dq=5,072,412
Timestamp: 2017-12-11 08:35:52
Document Index: 68577179

Matched Legal Cases: ['art.\n10', 'art 67', 'art 67', 'arts 67', 'arts 67', 'arts 67']

Patent US7022151 - Safety cabinet for antibiohazard - Google Patents
A safety cabinet which can prevent contaminated air from leaking from a working space through the periphery of a front shutter, and which can prevent outside air from entering the working space has a peripheral structure part surrounding the working space formed with air suction ports in a part opposed...http://www.google.com/patents/US7022151?utm_source=gb-gplus-sharePatent US7022151 - Safety cabinet for antibiohazard
Publication number US7022151 B2
Application number US 10/981,667
Also published as EP1426121A2, EP1426121A3, EP1426121B1, EP1754552A2, EP1754552A3, EP1754552B1, US7090709, US7323026, US20040107679, US20050060971, US20060150593
Publication number 10981667, 981667, US 7022151 B2, US 7022151B2, US-B2-7022151, US7022151 B2, US7022151B2
Inventors Keiichi Ono
Original Assignee Hitachi Industrial Equipment Systems Co., Ltd.
Patent Citations (14), Referenced by (11), Classifications (22), Legal Events (3)
US 7022151 B2
1. A safety cabinet comprising
a working space having a front portion,
a first housing including a workbench formed therein with air suction ports at the front portion of the working space, a front shutter provided in front of the working space, and a front opening connected to the working space and defined below the front shutter,
a second housing including intake system equipment for supplying purified air into the working space through a first purifying means, an exhaust system equipment for discharging air outside of the safety cabinet through a circulation passage connected to the working space and through a second filtering means,
wherein the workbench has a corner part formed with an inclined part as an armrest below the front opening.
2. A safety cabinet as set forth in claim 1, wherein the air suction ports formed in the workbench are provided therein with suction slits at their inlet port surface.
3. A safety cabinet as set forth in claim 1, wherein the air suction ports formed in the workbench are provided with suction slits below their inlet ports.
4. A safety cabinet as set forth in claim 1, wherein the inclined part has an inclined angle of 5 to 40 deg. with respect to a horizontal direction.
5. A safety cabinet as set forth in claim 1, wherein the air suction ports formed in the workbench have uppermost parts which are higher than the surface of the workbench.
6. A safety cabinet as set forth in claim 1, wherein auxiliary air ports are provided below the air suction ports.
7. A safety cabinet as set forth in claim 1, wherein the inclined part is provided at a position corresponding to the center part of the working space.
8. A safety cabinet as set forth in claim 1, wherein the inclined part is provided between the air suction ports and the front opening.
9. A safety cabinet as set forth in claim 6, wherein the auxiliary air ports are provided in a front surface of the first housing below the corner part.
10. A safety cabinet as set forth in claim 9, wherein the suction ports are formed in a surface parallel with the surface of the workbench.
11. A safety cabinet as set forth in claim 1, wherein the suction ports are formed in a surface parallel with the surface of the workbench.
This application is a continuation application of U.S. Ser. No. 10/650,820, filed Aug. 29, 2003, the contents of which are incorporated herein by reference.
Of these above-mentioned conventional safety cabinets, the safety cabinet shown in FIGS. 7 a to 8 b, has the seal wiper 8 made of rubber or resin, and accordingly the seal wiper 8 is likely to be readily damaged due to a friction between itself and the front shutter. If it is damaged, entrance of the outside air and leakage of air from the inside to the outside of the safety cabinet cannot be avoided. Thus, the seal wiper 8 should be periodically replaced with new one. Further, since the air suction ports 18 are merely provided at both side ends of the opening below the front shutter 9, there cannot be prevented both occurrence of turbulence in the corner parts between the front shutter 9 and the side surfaces 3 a′ of the working space 3, and leakage of air through the rails 10 for the front shutter 9. Further, there may be a possibility of leakage of air from corner parts between the shutter rails 10 and the seal wiper 8 at the upper end of the partition wall of the working space 3. Further, the front shutter 9 is inclined at its front surface by an angle of 10 deg. with respect to a vertical plane. Burble due to the inclined structure of the front shutter 9 is caused within the working space 3. In general, it has been known that the space which is widened in the flowing direction causes air to peel off along the inner wall parts of the passage if the passage is widened on both sides thereof by an angel of not less than about 4 to 5 deg. (about 2 to 2.5 deg on one side). In order to prevent air from peeling off, such a countermeasure that the velocities of air streams 12 blown off around the front shutter 9 are increased is taken. This countermeasure causes an increase in the velocity of the air in the working space 3 around the front shutter 9, and as a result, air is more likely to leak from the upper part of the front shutter 9 and around the front shutter rail 10 at both sides of the front shutter 9. Further, in the configurations of the safety cabinets disclosed in JP-B2-2,883,420 and JP-A-2000-346418, the gas-tightness of the working space is held or air in the isolator is prevented from leaking outside thereof, and accordingly, seal packing is required between the front shutter or the glass window and the partition wall of the working space. Further, JP-A-6-297356 discloses the configuration of a clean workbench in which the working chamber unit and the supply/discharge unit are fastened to each other, which effects negative pressure for preventing leakage of contaminants from the supply/discharge unit caused by the fastening structure, but this configuration is not the one which prevent leakage of air or entrance of air around the front shutter in the working chamber unit.
Further, in the safety cabinet according to the present invention, the above-mentioned inclined part has an angle of 5 to 40 deg. with respect to a horizontal direction.
Further, in the safety cabinet according to the present invention, the air-suction port in the workbench has a topmost part which is higher than the surface of the workbench.
Further, in the safety cabinet according to the present invention, an auxiliary air suction port is formed below the air suction port.
Further, in the safety cabinet according to the present invention, the above-mentioned inclined part is provided at a position corresponding to the center part of the working chamber.
FIG. 1 b is a partly broken front view illustrating the safety cabinet shown in FIG. 1 a;
FIG. 2 a is an enlarged sectional view illustrating a part A in FIG. 1 a;
FIG. 2 b is an enlarged sectional view along line B—B in FIG. 1 b;
FIG. 3 a is a vertical sectional view illustrating a safety cabinet in a second embodiment of the present invention;
FIG. 3 b is a partly broken front view illustrating the safety cabinet shown in FIG. 3 a;
FIG. 4 a is an enlarged sectional view illustrating a part A in FIG. 3 a;
FIG. 4 b is an enlarged sectional view along line B—B in FIG. 3 b;
FIG. 5 a is a vertical sectional view illustrating a safety cabinet in a third embodiment of the present invention;
FIG. 5 b is a partly broken front view illustrating the safety cabinet shown in FIG. 5 a;
FIG. 6 is an enlarged sectional view along line B—B in FIG. 5 b;
FIG. 7 a is a vertical sectional view illustrating a conventional safety cabinet;
FIG. 7 b is a partly broken front view illustrating the safety cabinet shown in FIG. 7 a;
FIG. 8 a is an enlarged sectional view illustrating a part A in FIG. 7 a;
FIG. 8 b is an enlarged sectional view along line B—B in FIG. 7 b;
FIG. 9 a is a vertical sectional view illustrating a safety cabinet in a forth embodiment of the present invention;
FIG. 9 b is a partly broken front view illustrating the safety cabinet shown in FIG. 9 a;
FIG. 10 a is an enlarged sectional view illustrating a part A in FIG. 9 a:
FIG. 10 b is an enlarged sectional view illustrating a variant form of the part, shown in FIG. 10 a;
FIG. 12 is a detailed sectional view illustrating a part of a safety cabinet in a sixth embodiment of the present invention;
FIG. 14 b is a partly broken front view illustrating the safety cabinet shown in FIG. 14 a;
FIG. 15 is a sectional view along line A—A in FIG. 14 b;
FIG. 16 is a sectional view along line B—B in FIG. 14 b; and
FIGS. 1 a to 1 b are views for explaining a first embodiment of the present invention. FIG. 1 a is a vertical sectional view illustrating a safety cabinet, FIG. 1 b is a front view illustrating the safety cabinet, FIG. 2 a is an enlarged view illustrating a part in FIG. 1 a, and FIG. 2 b is a sectional view along line B—B in FIG. 1 b.
FIGS. 3 a to 4 b are views for explaining a second embodiment of the present invention. FIG. 3 a is a vertical sectional view illustrating a safety cabinet, FIG. 3 b is a front view illustrating the safety cabinet shown in FIG. 3 a, FIG. 4 a is an enlarged view illustrating a part A in FIG. 3 a, and FIG. 4 b is an sectional view along line B—B in FIG. 3 b.
FIGS. 5 a to 6 are views for explaining a third embodiment of the present invention. FIG. 5 a is a vertical sectional view illustrating a safety cabinet, FIG. 5 b is a front view illustrating the safety cabinet shown in FIG. 5 a, and FIG. 6 is an enlarged view illustrating a part A in FIG. 5 a.
Referring to FIGS. 5 a to 6, there are shown a front shutter 9 which stands in a vertical direction, and air suction ports 16 a formed in parts which are opposed to the inner surface of the front shutter 9 and which are along the front shutter rails at opposite side parts of the working space 3. No suction ports corresponding to the suction ports 16 b are provided in the upper side part of the working space 3. The working of the air suction ports 16 a is the same as that of the second embodiment. The constitution and the working of the other parts in the third embodiment are the same as those in the second embodiment.
Further, explanation will be made of other embodiments of the safety cabinet according to the present invention with reference to FIGS. 9 a to 16. FIGS. 9 a and 9 b are views illustrating a configuration of a safety cabinet in a fourth embodiment of the present invention, and FIGS. 10 a and 10 b are detailed views illustrating configurations of parts of the safety cabinets in the fourth embodiment of the present invention. FIG. 11 is a detailed view illustrating a configuration of a part of a safety cabinet in a fifth embodiment of the present invention. FIG. 12 is a detailed view illustrating a configuration of a part of a safety cabinet in a sixth embodiment of the present invention. FIG. 13 is a detailed view illustrating a configuration of a part of a safety cabinet in a seventh embodiment of the present invention. FIGS. 14 a and 14 b are views illustrating a configuration of a safety cabinet in an eighth embodiment of the present invention. FIG. 15 is a sectional view along line A—A in FIG. 14 b, and FIG. 16 is a sectional view illustrating line B—B in FIG. 14 b.
Explanation will be made of the fourth embodiment. FIGS. 9 a and 9 b are a vertical sectional view and the front view, respectively, which show the safety cabinet in the fourth embodiment of the present invention. The safety cabinet in this embodiment incorporates a first housing 51 defining in its upper part a working space 3, and incorporating a workbench 2 formed therein with air suction ports on the front surface side of the working space, a front shutter 9 provided in front of the working space 3 and a front opening 64 formed below the front shutter 9, and a second housing 52 accommodating intake air system equipment for supplying purified air into the working space by way of a first air purifying means 5, and exhaust system equipment for discharging air outside of the safety cabinet, from a circulation passage connected to the working space 3, by way of a second air purifying means 4, and the workbench 2 has an inclined part 67 which is inclined downward further outward thereof, between the air suction ports 65 and the front opening 64. It is noted that the first housing and the second housing may be integrally incorporated with each other. Further, the air suction ports 65 and the inclined part 67 may be formed, separately from the workbench 2.
Although explanation has been made as mentioned above such that the suction ports formed in the inclined parts are slit-like, but the present invention should not be limited to this slit-like configuration, but they may be a plurality of holes since the quantity of air sucked into the air suction ports in the inlet surface 7 of the workbench is adapted to change the direction the air stream along the arms 101. Further, as shown in FIG. 10 b, the suction slits 68 may be attached below the inclined parts 67 b.
Next, explanation will be made of a fifth embodiment. FIG. 11 is a detailed view illustrating a part of a safety cabinet in the fifth embodiment. In this embodiment, only auxiliary suction holes 69 are formed but no suction slits are provided in the inclined parts 67. With this configuration, even though the worker has tired so as to set his arms 101 a on the inclined parts 67 after experiments carried out for a long time, the arms does not make contact with the corner parts, and accordingly, the worker does not feel discomfort.
Explanation will be made of an eighth embodiment of the present invention. FIGS. 14 a and 14 b are structural views illustrating a safety cabinet in the eighth embodiment of the present invention, and FIGS. 15 and 16 are sectional views along line A—A and line B—B in FIG. 4 b. In the safety cabinet, the position where prevention of cross-contamination among specimens is ensured is specified as the center of the workbench which is distant from each side surface of the working space by not less than 355 mm as in U.S. NSF standards but by not less than 360 mm as in JIS K3800:2000.
US3728866 * Jul 8, 1971 Apr 24, 1973 Interlab Inc Exhaustless clean room work stations
US6660054 Sep 10, 2001 Dec 9, 2003 Misonix, Incorporated Fingerprint processing chamber with airborne contaminant containment and adsorption
JP2577751B2 Title not available
JP2883420B2 Title not available
JP2000346418A Title not available
JP2002079118A Title not available
JPH06297356A Title not available
US8163052 * Oct 10, 2007 Apr 24, 2012 Hitachi Industrial Equipment Systems Co., Ltd. Safety cabinet
US8382873 Mar 26, 2012 Feb 26, 2013 Hitachi Industrial Equipment Systems Co., Ltd. Safety cabinet
US8728187 Jan 31, 2013 May 20, 2014 Hitachi Industrial Equipment Systems Co., Ltd. Safety cabinet
US9505043 * Apr 16, 2010 Nov 29, 2016 Waldner Laboreinrichtungen Gmbh & Co. Kg Laboratory fume cupboard
US20080150404 * Oct 10, 2007 Jun 26, 2008 Keiichi Ono Safety cabinet
US20100267321 * Jun 22, 2007 Oct 21, 2010 Institute Of Occupational Safety And Health, Council Of Labor Affairs, Executive Yuan Air curtain-isolated biosafety cabinet
US20120100789 * Apr 16, 2010 Apr 26, 2012 Waldner Laboreinrichtungen Gmbh & Co. Kg Laboratory fume cupboard
US20120276830 * Apr 26, 2011 Nov 1, 2012 Rong Fung Huang Exhaust device having deflection plates
U.S. Classification 55/385.2, 454/57, 454/187, 55/473, 55/DIG.29, 454/56, 55/DIG.18
International Classification F24F3/16, B01D46/00, B08B15/02
Cooperative Classification Y10S55/18, Y10S55/46, Y10S55/29, B01L1/04, B08B2215/003, B01L2200/082, F24F3/1607, B01L2300/0681, B08B15/023
European Classification F24F3/16B3, B01L1/04, B08B15/02B