US3751746A - Apparatus for collecting liquid mercury - Google Patents
Apparatus for collecting liquid mercury Download PDFInfo
- Publication number
- US3751746A US3751746A US00202871A US3751746DA US3751746A US 3751746 A US3751746 A US 3751746A US 00202871 A US00202871 A US 00202871A US 3751746D A US3751746D A US 3751746DA US 3751746 A US3751746 A US 3751746A
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- mercury
- pad
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- plate
- spilled
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C5/00—Filling or capping teeth
- A61C5/60—Devices specially adapted for pressing or mixing capping or filling materials, e.g. amalgam presses
- A61C5/68—Mixing dental material components for immediate application to a site to be restored, e.g. a tooth cavity
Definitions
- Apparatus for collecting spilled liquid mercury comprising a container and a pad of nonrigid, open-cell foam material for entrapping drops of spilled mercury to permit the transferring of the mercury to the container for release of the mercury therefrom for collection in the container.
- the pad entraps the spilled mercury when it is compressed against a surface having drops of mercury thereon and holds the mercury within the pad when it is lifted clear of the surface.
- a perforate plate is mounted in the container spaced above the bottom thereof so as to support the pad when the pad is pressed downwardly thereagainst to effect compression of the pad and release of the mercury entrapped within the pad.
- a lid is removably secured to the mouth of the container. The containers height is such that a space is provided between the perforate plate and the undersurface of the lid sufficient to permit the pad to rest in a stored position on the perforate plate without compression of the pad.
- This invention relates to apparatus for collecting liquid mercury from a surface, and more particularly relates to apparatus for collecting droplets or small quantities of spilled mercury.
- mercury is commonly employed in dental offices for the preparation of various dental materials and is used in scientific laboratories in various laboratory apparatus, such as manometers and barometers. If properly stored and handled, mercury is relatively safe material, but it does pose a serious health hazard (i.e., mercury intoxication) to persons breathing mercury vapor.
- mercury is a metal and has a relatively high boiling point (357 C.)
- it does exhibit a tendency to vaporize in air, the equilibrium concentration of mercury in air at 25 C. being about 2 milligrams per cubic meter (mg/m Small quantities of mercury are sometimes inadvertently spilled. This spilled mercury tends to splatter upon striking a surface (e.g., the floor) forming small droplets of liquid mercury.
- Mercury collectors have been used in the past. Some of these prior art mercury collectors utilize a foam pad which is bonded to the undersurface of a threaded lid which is screwed into the mouth of the container.
- the pad is used to soak up the spilled mercury and to transfer it to the container where the pad is compressed by threading the lid into the container to effect the release of the mercury in the pad.
- these prior art mercury collectors have several disadvantages, for example: the pad is stored within the container in a compressed state causing the pad to develop permanent compression set which renders the pad substantially ineffective'for picking up spilled mercury; and the screwing of the lid onto the container to compress the pad tends to tear the pad from the lid and substantiallyincreases the time required to collect a quantity of spilled mercury.
- apparatus of this invention for collecting spilled liquid mercury comprises a container having an upwardly opening mouth and a bottom wall.
- Collecting means are provided for entrapping drops of spilled mercury thus permitting the transferring of the mercury to the container for release of the mercury from the collecting means for collection in the container.
- This collecting means comprises a pad of nonrigid, open-cell foam material which when compressed against a surface having drops of mercury thereon permits the spilled mercury to flow into the cells of the pad and which when uncompressed holds the mercury within the pad.
- a perforate plate is mounted within the container spaced above the bottom wall thereof so as to support the collecting means when the latter is pressed downwardly thereon to compress the pad which releases the mercury entrapped in the pad and permits the mercury to flow through the holes in the plate for collection in the bottom of the container.
- a lid is removably secured to the mouth of the container, and the container is of a height to provide a space between the plate and the lid sufficient to permit the collecting means to rest in a stored position on the plate without substantial compression of the pad when the lid is secured to the mouth of the container.
- FIG. 1 is a plan view of apparatus of this invention with parts broken away showing collecting means resting in a stored position on a perforate plate disposed within a container;
- FIG. 2 is a vertical section on line 22 of FIG. 1 showing the collecting means in its stored position with substantially no compression of its foam pad;
- FIG. 3 is a view similar to FIG. 2 with the lid of the container removed and with the collecting means compressed against the perforate plate to release mercury from within the pad for collecting in the container;
- FIG. 4 is an elevation view showing the collecting means disposed above a surface having drops of mercury thereon and showing (in phantom) the collecting means as it is pressed down against the surface for entrapment of the mercury within the pad.
- apparatus of this invention for collecting spilled liquid mercury is indicated in its entirety at l and is shown to comprise a cylindrical container 3 (e.g., a jar) having an upwardly opening mouth 5 (see FIG. 3), a cylindrical side wall 7 and a bottom wall 9.
- a lid 11 is threadably secured to the upper end of side wall 7 to seal the container mouth when the ap paratus is not in use.
- a mercury collecting unit generally indicated at 13 is provided for entrapping drops of spilled liquid mercury within the collecting unit thus permitting the spilled mercury to be transferred to container 3 for collection therein.
- This collecting unit includes a pad 15 of nonrigid, open-cell foam material (e.g., polyurethane foam) which when compressed against a surface S having drops of mercury M thereon (see FIG. 4) permits the mercury to flow into the cells of the pad and which when uncompressed (i.e., when the pad is lifted clear of surface S) holds the mercury entrapped within the pad.
- Pad 15 is bonded to the bottom face of a backup member 17, the latter being a rigid backing for the pad to insure uniform compression of the pad when it is pressed against a surface.
- a handle 19 is secured to and extends up from the center portion of the backup member to facilitate holding of the collecting units.
- Pad and backup [7 are circular in plan and have a loose fit within the container to permit easy removal of the collecting unit from the container and replacement therein.
- a circular perforate plate 21 having a plurality of holes 23 therein is mounted in container 3 and spaced above bottom wall 9.
- the plate has three legs 25 extending downwardly from its bottom face for supporting the plate above the bottom of the container.
- mercury entrapped within the pad is released from the pad to flow through holes 23 in the plate for collection in the bottom of the container (see FIG. 3).
- the diameter of the perforate plate is somewhat smaller than the inside diameter of the container thus providing a loose fit of the plate within the container and permitting the plate to be readily removed therefrom. As shown in FIG.
- the height of container 3 is such that a space is provided between the upper surface of perforate plate 21 and the undersurface of lid 11 when the lid is threaded on the upper portion of side wall 7 to close off container mouth 5.
- collecting unit 13 rests in a stored position within the container with pad 15 supported on the perforate plate without any substantial compression.
- handle 19 is disposed below the lid so that pad 15 supports only the weight of the collecting unit.
- the pad remains in a substantially uncompressed state when it is in its stored position to thereby avoid compression set from developing in the pad, thus maintaining the effectiveness of the pad to pick up spilled mercury from a surface.
- mercury collector l of this invention To use mercury collector l of this invention to collect a quantity of liqiuid mercury which has been inadvertently spilled on a surface S, lid 11 is unscrewed from container 3 and collecting unit 13 is lifted from its stored position within the container. The collecting unit is firmly pressed against a surface S having drops of mercury M thereon to compress the pad (as shown in phantom in FIG. 4) and thereby permit the mercury to flow into the open cells of the pad. The collecting unit is then lifted clear of surface S permitting the pad to return to its uncompressed state for entrapping the mercury within the pad. The collecting unit is then moved to a position within the container and is pressed downwardly against perforate plate 21 (see FIG.
- lt is an important feature of mercury collector 1 of this invention that pad 15 of collecting unit 13 is compressible against perforate plate 21 simply by pressing down on handle 19 as indicated by the arrow in FIG. 3 without twisting or turning the pad relative to perforate plate 21.
- the direct manner in which the pad is compressed simplifies the use of a mercury collector of this invention, speeds up the collection of spilled mercury, and prevents damage of the pad.
- Apparatus for collecting spilled liquid mercury comprising:
- a container having an upwardly opening mouth and a bottom wall;
- said col lecting means comprising a pad of nonrigid opencell foam material which when compressed against a surface having drops of mercury thereon permits the spilled mercury to flow into the cells of said pad and which when uncompressed holds the mercury within the pad, said collecting means further including a back-up member for said pad and a handle secured to and extending up from said back-up member; perforate plate mounted within said container having a plurality of holes therein, said plate being spaced above the bottom wall of the container and being adapted to support said collecting means when the latter is pressed downwardly thereon to compress said pad to release mercury entrapped within the pad and to permit the mercury to flow through said holes in the plate for collection in the bottom of said container; and lid removably secured to the mouth of said container, said container being of a height to provide a space between said plate and said lid sufficient to permit said collecting means to rest in
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- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Dentistry (AREA)
- Epidemiology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
Apparatus for collecting spilled liquid mercury comprising a container and a pad of nonrigid, open-cell foam material for entrapping drops of spilled mercury to permit the transferring of the mercury to the container for release of the mercury therefrom for collection in the container. The pad entraps the spilled mercury when it is compressed against a surface having drops of mercury thereon and holds the mercury within the pad when it is lifted clear of the surface. A perforate plate is mounted in the container spaced above the bottom thereof so as to support the pad when the pad is pressed downwardly thereagainst to effect compression of the pad and release of the mercury entrapped within the pad. A lid is removably secured to the mouth of the container. The container''s height is such that a space is provided between the perforate plate and the undersurface of the lid sufficient to permit the pad to rest in a stored position on the perforate plate without compression of the pad.
Description
ilnite States Patent [191 Elbreder Aug. 114, 1973 APPARATUS FOR COLLECTING LIQUKD MERCURY [76] Inventor: Charles H. Elbreder, 1702 Chase Dr., Fenton, Mo. 63026 22 Filed: Nov. 29, 1971 211 Appl.No.: 202,871
[52] US. Cl. 15/1, 15/221, 15/244 R,
15/260, 294/1 [51] Int. Cl. A471 13/16, A471 13/58 [58] Field of Search 15/1, 221, 244 R,
27,444 11/1910 Great Britain 15/260 Primary Examiner-Danie1 Blum Attorney-Stuart N. Senniger et al.
[57] S :1": CT
Apparatus for collecting spilled liquid mercury comprising a container and a pad of nonrigid, open-cell foam material for entrapping drops of spilled mercury to permit the transferring of the mercury to the container for release of the mercury therefrom for collection in the container. The pad entraps the spilled mercury when it is compressed against a surface having drops of mercury thereon and holds the mercury within the pad when it is lifted clear of the surface. A perforate plate is mounted in the container spaced above the bottom thereof so as to support the pad when the pad is pressed downwardly thereagainst to effect compression of the pad and release of the mercury entrapped within the pad. A lid is removably secured to the mouth of the container. The containers height is such that a space is provided between the perforate plate and the undersurface of the lid sufficient to permit the pad to rest in a stored position on the perforate plate without compression of the pad.
3 Claims, 4 Drawing Figures APPARATUS FOR COLLECTING LIQUID MERCURY BACKGROUND OF THE INVENTION This invention relates to apparatus for collecting liquid mercury from a surface, and more particularly relates to apparatus for collecting droplets or small quantities of spilled mercury.
Among its various uses, mercury is commonly employed in dental offices for the preparation of various dental materials and is used in scientific laboratories in various laboratory apparatus, such as manometers and barometers. If properly stored and handled, mercury is relatively safe material, but it does pose a serious health hazard (i.e., mercury intoxication) to persons breathing mercury vapor. Although mercury is a metal and has a relatively high boiling point (357 C.), it does exhibit a tendency to vaporize in air, the equilibrium concentration of mercury in air at 25 C. being about 2 milligrams per cubic meter (mg/m Small quantities of mercury are sometimes inadvertently spilled. This spilled mercury tends to splatter upon striking a surface (e.g., the floor) forming small droplets of liquid mercury. These small droplets expose more surface area of the mercury to the air, thereby increasing the tendency of the liquid mercury to vaporize. If spilled mercury is not promptly collected, significant amounts of mercury I vapor may be inhaled by persons working in the area so that over a period of time these persons may become afflicted with mercury intoxication.
Mercury collectors have been used in the past. Some of these prior art mercury collectors utilize a foam pad which is bonded to the undersurface of a threaded lid which is screwed into the mouth of the container. The
pad is used to soak up the spilled mercury and to transfer it to the container where the pad is compressed by threading the lid into the container to effect the release of the mercury in the pad. However, these prior art mercury collectors have several disadvantages, for example: the pad is stored within the container in a compressed state causing the pad to develop permanent compression set which renders the pad substantially ineffective'for picking up spilled mercury; and the screwing of the lid onto the container to compress the pad tends to tear the pad from the lid and substantiallyincreases the time required to collect a quantity of spilled mercury.
SUMMARY OF THE INVENTION Among the several objects of this invention maybe noted the provision of a mercury collector for collecting quantities of spilled mercury; the provision of such a mercury collector in which its foam collecting pad is compressed without twisting or turning movement to effect release of the mercury entrapped within the pad; the provision of such a mercury collector in which the pad is stored within the container in an uncompressed state; and the provision of such a mercury collector which is easy to use and which is of economical construction. Other objects and features of this invention will be in part apparent and in part pointed out hereinafter.
Briefly, apparatus of this invention for collecting spilled liquid mercury comprises a container having an upwardly opening mouth and a bottom wall. Collecting means are provided for entrapping drops of spilled mercury thus permitting the transferring of the mercury to the container for release of the mercury from the collecting means for collection in the container. This collecting means comprises a pad of nonrigid, open-cell foam material which when compressed against a surface having drops of mercury thereon permits the spilled mercury to flow into the cells of the pad and which when uncompressed holds the mercury within the pad. A perforate plate is mounted within the container spaced above the bottom wall thereof so as to support the collecting means when the latter is pressed downwardly thereon to compress the pad which releases the mercury entrapped in the pad and permits the mercury to flow through the holes in the plate for collection in the bottom of the container. A lid is removably secured to the mouth of the container, and the container is of a height to provide a space between the plate and the lid sufficient to permit the collecting means to rest in a stored position on the plate without substantial compression of the pad when the lid is secured to the mouth of the container.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of apparatus of this invention with parts broken away showing collecting means resting in a stored position on a perforate plate disposed within a container;
FIG. 2 is a vertical section on line 22 of FIG. 1 showing the collecting means in its stored position with substantially no compression of its foam pad;
FIG. 3 is a view similar to FIG. 2 with the lid of the container removed and with the collecting means compressed against the perforate plate to release mercury from within the pad for collecting in the container; and
FIG. 4 is an elevation view showing the collecting means disposed above a surface having drops of mercury thereon and showing (in phantom) the collecting means as it is pressed down against the surface for entrapment of the mercury within the pad.
Corresponding reference characters indicate corresponding parts throughout the several views of' the drawings.
DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to the drawings, apparatus of this invention for collecting spilled liquid mercury is indicated in its entirety at l and is shown to comprise a cylindrical container 3 (e.g., a jar) having an upwardly opening mouth 5 (see FIG. 3), a cylindrical side wall 7 and a bottom wall 9. A lid 11 is threadably secured to the upper end of side wall 7 to seal the container mouth when the ap paratus is not in use.
A mercury collecting unit generally indicated at 13 is provided for entrapping drops of spilled liquid mercury within the collecting unit thus permitting the spilled mercury to be transferred to container 3 for collection therein. This collecting unit includes a pad 15 of nonrigid, open-cell foam material (e.g., polyurethane foam) which when compressed against a surface S having drops of mercury M thereon (see FIG. 4) permits the mercury to flow into the cells of the pad and which when uncompressed (i.e., when the pad is lifted clear of surface S) holds the mercury entrapped within the pad. Pad 15 is bonded to the bottom face of a backup member 17, the latter being a rigid backing for the pad to insure uniform compression of the pad when it is pressed against a surface. A handle 19 is secured to and extends up from the center portion of the backup member to facilitate holding of the collecting units. Pad and backup [7 are circular in plan and have a loose fit within the container to permit easy removal of the collecting unit from the container and replacement therein.
A circular perforate plate 21 having a plurality of holes 23 therein is mounted in container 3 and spaced above bottom wall 9. The plate has three legs 25 extending downwardly from its bottom face for supporting the plate above the bottom of the container. When collecting unit 13 is pressed downwardly against the upper surface of the perforate plate to effect compression of pad 15, mercury entrapped within the pad is released from the pad to flow through holes 23 in the plate for collection in the bottom of the container (see FIG. 3). The diameter of the perforate plate is somewhat smaller than the inside diameter of the container thus providing a loose fit of the plate within the container and permitting the plate to be readily removed therefrom. As shown in FIG. 2, the height of container 3 is such that a space is provided between the upper surface of perforate plate 21 and the undersurface of lid 11 when the lid is threaded on the upper portion of side wall 7 to close off container mouth 5. Thus with the lid threaded in place, collecting unit 13 rests in a stored position within the container with pad 15 supported on the perforate plate without any substantial compression. It will be noted that with the collecting unit in its stored position, handle 19 is disposed below the lid so that pad 15 supports only the weight of the collecting unit. Thus, the pad remains in a substantially uncompressed state when it is in its stored position to thereby avoid compression set from developing in the pad, thus maintaining the effectiveness of the pad to pick up spilled mercury from a surface.
To use mercury collector l of this invention to collect a quantity of liqiuid mercury which has been inadvertently spilled on a surface S, lid 11 is unscrewed from container 3 and collecting unit 13 is lifted from its stored position within the container. The collecting unit is firmly pressed against a surface S having drops of mercury M thereon to compress the pad (as shown in phantom in FIG. 4) and thereby permit the mercury to flow into the open cells of the pad. The collecting unit is then lifted clear of surface S permitting the pad to return to its uncompressed state for entrapping the mercury within the pad. The collecting unit is then moved to a position within the container and is pressed downwardly against perforate plate 21 (see FIG. 3) to effect compression of the pad for release of the mercury entrapped therein. As the mercury is released from the pad, it flows through holes 23 in the perforate plate and collects in the bottom of the container. The above-stated procedure is repeated until all the spilled mercury has been collected in the container. The collected mercury may then be poured from container 3 into another container (not shown) for reuse or for being reclaimed. Collecting unit 13 is then returned to its stored position within the container and lid 11 is screwed on the container to prevent escape of vapor from any mercury that may remain in the container.
lt is an important feature of mercury collector 1 of this invention that pad 15 of collecting unit 13 is compressible against perforate plate 21 simply by pressing down on handle 19 as indicated by the arrow in FIG. 3 without twisting or turning the pad relative to perforate plate 21. The direct manner in which the pad is compressed simplifies the use of a mercury collector of this invention, speeds up the collection of spilled mercury, and prevents damage of the pad.
in view of the above, it will be seen that the several objects of the invention are achieved and other advantageous results attained.
As various changes could be made in the above construction without departing from the scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.
I claim:
1. Apparatus for collecting spilled liquid mercury comprising:
a container having an upwardly opening mouth and a bottom wall;
collecting means for entrapping drops of spilled mercury thus permitting the transferring of the mercury to the container for release of the mercury therefrom for collection in said container, said col lecting means comprising a pad of nonrigid opencell foam material which when compressed against a surface having drops of mercury thereon permits the spilled mercury to flow into the cells of said pad and which when uncompressed holds the mercury within the pad, said collecting means further including a back-up member for said pad and a handle secured to and extending up from said back-up member; perforate plate mounted within said container having a plurality of holes therein, said plate being spaced above the bottom wall of the container and being adapted to support said collecting means when the latter is pressed downwardly thereon to compress said pad to release mercury entrapped within the pad and to permit the mercury to flow through said holes in the plate for collection in the bottom of said container; and lid removably secured to the mouth of said container, said container being of a height to provide a space between said plate and said lid sufficient to permit said collecting means to rest in a stored position on said plate without substantial compression of said pad when said lid is secured to the mouth of said container.
2. Apparatus as set forth in claim 1 wherein said plate has a plurality of legs extending down from its bottom surface for supporting the plate above the bottom wall of said container.
3. Apparatus as set forth in claim 1 wherein said foam material is polyurethane foam.
* i t t
Claims (3)
1. Apparatus for collecting spilled liquid mercury comprising: a container having an upwardly opening mouth and a bottom wall; collecting means for entrapping drops of spilled mercury thus permitting the transferring of the mercury to the container for release of the mercury therefrom for collection in said container, said collecting means comprising a pad of nonrigid open-cell foam material which when compressed against a surface having drops of mercury thereon permits the spilled mercury to flow into the cells of said pad and which when uncompressed holds the mercury within the pad, said collecting means further including a back-up member for said pad and a handle secured to and extending up from said back-up member; a perforate plate mounted within said container having a plurality of holes therein, said plate being spaced above the bottom wall of the container and being adapted to support said collecting means when the latter is pressed downwardly thereon to compress said pad to release mercury entrapped within the pad and to permit the mercury to flow through said holes in the plate for collection in the bottom of said container; and a lid removably secured to the mouth of said container, said container being of a height to provide a space between said plate and said lid sufficient to permit said collecting means to rest in a stored position on said plate without substantial compression of said pad when said lid is secured to the mouth of said container.
2. Apparatus as set forth in claim 1 wherein said plate has a plurality of legs extending down from its bottom surface for supporting the plate above the bottom wall of said container.
3. Apparatus as set forth in claim 1 wherein said foam material is polyurethane foam.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US20287171A | 1971-11-29 | 1971-11-29 |
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US3751746A true US3751746A (en) | 1973-08-14 |
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US00202871A Expired - Lifetime US3751746A (en) | 1971-11-29 | 1971-11-29 | Apparatus for collecting liquid mercury |
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Cited By (7)
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US4028137A (en) * | 1974-11-14 | 1977-06-07 | Wacker-Chemitronic Gesellschaft Fur Elektronik-Grundstoffe Mbh | Process for the quantitative removal of residual melts from crucibles |
EP0311360A2 (en) * | 1987-10-09 | 1989-04-12 | Scot Young Research Limited | Cleaning equipment |
US4872237A (en) * | 1985-11-25 | 1989-10-10 | Smith Lloyd J | Chalk dust remover |
US5155877A (en) * | 1991-04-29 | 1992-10-20 | Mocorp, Incorporated | Plunger device for removing liquid from carpet |
US5971199A (en) * | 1998-01-12 | 1999-10-26 | Amway Corporation | Soil separation apparatus |
USD424111S (en) * | 1997-11-18 | 2000-05-02 | Bell Charles E | Eraser |
CN106361236A (en) * | 2016-10-21 | 2017-02-01 | 宁波德润堂智能科技有限公司 | Cleaning tool |
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
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US4028137A (en) * | 1974-11-14 | 1977-06-07 | Wacker-Chemitronic Gesellschaft Fur Elektronik-Grundstoffe Mbh | Process for the quantitative removal of residual melts from crucibles |
US4872237A (en) * | 1985-11-25 | 1989-10-10 | Smith Lloyd J | Chalk dust remover |
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US4878264A (en) * | 1987-10-09 | 1989-11-07 | Scot Young Service Systems Limited | Cleaning equipment |
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US5155877A (en) * | 1991-04-29 | 1992-10-20 | Mocorp, Incorporated | Plunger device for removing liquid from carpet |
USD424111S (en) * | 1997-11-18 | 2000-05-02 | Bell Charles E | Eraser |
US5971199A (en) * | 1998-01-12 | 1999-10-26 | Amway Corporation | Soil separation apparatus |
CN106361236A (en) * | 2016-10-21 | 2017-02-01 | 宁波德润堂智能科技有限公司 | Cleaning tool |
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