CA1135390A - Waterproof electric drive motor for a drill - Google Patents
Waterproof electric drive motor for a drillInfo
- Publication number
- CA1135390A CA1135390A CA000363331A CA363331A CA1135390A CA 1135390 A CA1135390 A CA 1135390A CA 000363331 A CA000363331 A CA 000363331A CA 363331 A CA363331 A CA 363331A CA 1135390 A CA1135390 A CA 1135390A
- Authority
- CA
- Canada
- Prior art keywords
- drill
- air
- manifold
- flow
- motor space
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/10—Casings or enclosures characterised by the shape, form or construction thereof with arrangements for protection from ingress, e.g. water or fingers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B45/00—Hand-held or like portable drilling machines, e.g. drill guns; Equipment therefor
- B23B45/001—Housing of the drill, e.g. handgrip
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/26—Structural association of machines with devices for cleaning or drying cooling medium, e.g. with filters
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Drilling And Boring (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
- Motor Or Generator Cooling System (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
In a drill with an electric motor positioned within a motor space, air for cooling the motor is drawn in through an inlet manifold and discharged through an outlet manifold.
The inlet and outlet manifolds are constructed to prevent the flow of water into contact with the motor. A hood-like deflector is provided over the entrance into the inlet manifold.
Further, filters located within the manifolds remove any water in the air. A labyrinth air passage conducts the air from the inlet manifold into the motor space.
In a drill with an electric motor positioned within a motor space, air for cooling the motor is drawn in through an inlet manifold and discharged through an outlet manifold.
The inlet and outlet manifolds are constructed to prevent the flow of water into contact with the motor. A hood-like deflector is provided over the entrance into the inlet manifold.
Further, filters located within the manifolds remove any water in the air. A labyrinth air passage conducts the air from the inlet manifold into the motor space.
Description
1~3~
The present invention is directed to a drill with a spray-proof electric drive motor located within an air-cooled motor space.
Drills and other electrically driven hand-held tools are subjected in a plurality of applications to moisture from water spray or the like. The occurence of water spray may, for example, have an undesirable side effect on motor cooling at a working location. As is well known, water spray occurs when a tool is used in the rain.
Normally, drills dxiven by an electric motor are air-cooled. In conventional drills, there is the problem that water spray may penetrate into the motor space along with the cooling air, so that the operator is subjected to the danger of exposure to high voltages.
In drills using three-phase motors or capacitor motors which have performance characteristics that are extremely unfavorable for drills, this problem has been obviated by a two-shell housing with the inner shell of the housing being a water-tight enclosure forming the motor space. To effect cooling, air is conducted between the inner shell and the outer shell.
In motors of the above-mentioned type, such so-called jacket ventilation effects in many cases only an insufficient cooling, accordingly, it is not suitable for drills, a majority of which are equipped with universal motors. Universal motors are distinguished, on the one hand, by favorable performance characteristics and, on the other hand, they have a low weight and a small volume as compared to three-phase motors.
Therefore, it is the primary object of the present invention tO provide an electric motor driven drill with water .,~.~".
~ ~35~
spray protection combined with air cooling which is effective for universal motors.
In accordance with the present invention, for cooling the motor, an intake manifold is provided which directs air into the motor space and a deflector shield is located over the intake opening. At least one filter is positioned within the intake manifold and a labyrinth air passage is positioned between the filter and the motor space. The labyrinth air passage provides a tortuous flow path for the air entering the motor space. After the cooling air flows over the motor it is conducted out of the drill through an oulet manifold. The outlet manifold is arranged for preventing water spray from entering into the motor space.
The intake manifold for the cooling air, with a deflector shield located in front of its inlet and with a filter within its flow path, prevents any direct penetration of water spray such as when the tool is used in an area where water spray is present. In addition, the flow passage within the intake manifold serves as a space for guiding the drawn-in air.
In this inflow passage, moisture precipitates out which might not have been removed by the first filter. Moisture can be discharged from the intake manifold by conventional means, such as a one-way valve.
To ensure that the cooling flow is deflected in any position in which the drill is used, advantageously, the intake manifold is pivotally or flexibly mounted so tha't its intake opening can be adjusted in the direction least affected by the water spray.
After the cooling air flow has been filtered within the intake manifold or by means associated with the manifold, it ~135~
reaches a labyrinth air passage where it is sharply deflected several times by baffles located within the labyrinth passage so that the air flow follows a tortuous path. This tortuous flow path results in a separation of any remaining water droplets from the cooling air stream. The individual chambers within the labyrinth air passage are arranged so that any accumulated separated moisture cannot penetrate into the motor space in any position in which the hand-held tool is used. The intake manifold is coupled to the drill housing containing the labyrinth air passage such as by a flange connection. For easy manipulation, it is advantageous to construct such a connection so that i~ is releasable by means of a coded plug-in connection associated with the current supply. As a result, it can be ensured in a simple manner that, when the intake manifold is not coupled to the housing, the current supply to the motor is interrupted and operation of the hand-held tool is not possible.
The moisture-free air reaching the motor space from the labyrinth air passage, for effecting cooling of the drive motor, is drawn into the motor space by a radial ventilator connected to the motor and is discharged into the ambient air through an outlet manifold. The outlet manifold has a closure member for preventing water spray or moisture from passing through the outlet manifold into the motor space when the drill is no,t operating.
Preferably, the intake manifold has a curvature of about 180 around the housing for deflecting the cooling flow.
In this way it can be safely ensured that the cooling flow is sufficiently deflected between the opening into the intake manifold and the labyrinth air passage independent of the position in which the drill is used.
~s~
Further, to ensure that the outlet manifold for the cooling air exiting from the motor space prevents any penetration of water spray in any position in which the drill is used, particularly when the drill is not in operation, another feature of the invention is the provision of the outlet manifold with a curvature of 180 for deflecting the outlet flow of cooling air.
Any moisture which might possibly penetrate the first filter within the intake maniold can be removed by a fine filter in spaced relationship with the first filter. Any water residue passing through the first filter is collected in the space between the two filters.
Preferably, the closure at the entry into the outlet manifold is in the form of a filter. To discharge any water which may have penetrated into the filter, an exit opening, for example, containing a one-way valve, may be positioned in the range of the filter.
In another embodiment, the closure for the outlet manifold can be provided in the form of a valve. A suitable closure, among others, is a fIap valve which closes the outlet manifold when the drill is not being used. Accordingly, such valves prevent any passage of water or moisture into the outlet manifold when the drill is not in operation.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages and specific objects attained by its use, reference should be had to the accompanying drawings and descriptive matter in which there are illustrated and described preferred embodiments of the invention.
3~q3 IN THE DRAWING:
Fig. 1 is a side view, partly in section, of a stylized representation of a drill embodying the present invention, and, Fig~ la is another embodiment of detail A indicated in Fig. 1.
In Fig. l a somewhat schematic showing of a hand-held drill is provided including a housing 1 having a forward portion 2, that is the lower portion as viewed in the drawing with a motor 3 within the forward portion, and a rearward portion 4 forming a labyrinth air passage 5 for conducting air into the 'orward portion. Ribs or baffles 6 divide the labyrinth air passage 5 providing a tortuous path for the flow of cooling air.
In the range of the rearward portion 4 of the housing 1, that is, the upper part as viewed in Fig. 1, an intake manifold 7 is positioned around at least a portion of the housing l. A
first filter 8 is located in the intkae opening into the intake manifold 7. An annular disk 9 mounted within the intake manifold 7 prevents the filter from moving inwardly through the manifold.
First filter 8 is preferably a course filter and a fine filter ll is spaced along the path of flow of air within the intake manifold from the first filter l. Located at the inlet into the intake manifold 7 is a deflector shield 12 forming a cover in front of the inlet. The deflector shield 12 is fastened to the housing 1. Any water spray is prevented from flowing directly into the inlet opening of the intake manner 7 by the deflector shield. At the front end of the forward portion 2, that is, the opposite end from the labyrinth air passage 5, a radial ventilator 13 is fixed on motor shaft 3a and draws the cooling air flow indicated by the arrows from motor space 14 into an annular l~L36-3~
duct 15 within the housing and laterally surrounding the radial ventilator. The cooling air flows from the duct 15 into an outlet manifold 16 and then into the ambient atmosphere. Outlet manifold 16 is located around the front end of the forward portion 2 of the housing 1. Another filter 17 is located within the outlet manifold 16 so that the air flowing from the duct lS passes through the filter 17. A ring 22 located at the inlet into the outlet manifold, suppoxts the filter 17. The primary purpose of filter 17 is to prevent moisture from passing through the outlet manifold 16 into the interior of the housing when the drill is not in operation. Any water flowing through the outlet manifold to the filter 17 is caught at that location and can be discharged through a lateral discharge opening 18.
At the front or lower end of the housing 1 a tool, for example, a drill bit 19 is chucked into the drill.
In the arrangement as illustrated, while the drill is being operated, a flow of cooling air is drawn in between the deflector shield 12 and the inlet opening into the intake manifold 7 passing through the first filter 8 into the manifold duct. Any water finding its way through the filter 8 would be, to a large extent, collected in the next stage by the following fine filter 11 or in the baffle space 21 located between the two filters. After its passage through the fine filter 11 the cooling air flow changes direction entering the rear end of the rearward portion 4 of the housing and flowing along a tortuous path formed by the baffles 6 within the labyrinth air passage 5.
Within this labyrinth air passage 5, any remaining moisture particles are precipitated out. Any moisture precipitated in the form of drops in the intake manifold is prevented by the structure of the labyrinth air passage 5 from entering into ~3~
motor space 14 regardless of the position in which the drill is used.
For any extreme conditions of water spray, and for additional safety purposes, it may be advantageous to provide additional filters and baffles in the path of the cooling air flow before it enters the motor space 14. Furthermore, it may also be advantageous to provide similar measures in the region of the outlet manifold 16.
As can be seen in Fig. la, instead of the filter 17, a valve 23 is located at the entrance from the duct 15 into the outlet manifold 16. This valve prevents water from flowing from the outside through the outlet manifold 16 into the interior of the housing. Valve 23 is formed of a closing disk 24 of an elastic material, such as rubber, with a spring 25 biasing the disk 24 into a closed position against the ring 22. When the drill is in operation, the closing disk 24 is lifted off the ring 22 by the cooling air flow against the biasing force of the spring 25 so that the valve 23 is opened for the discharge - flow of the cooling air out of the drill.
Drain means, such as removable drain plug 26, is provided in rear portion 4, for removal of moisture. Any other suitable drain means such as a one way valve might also be used.
As described above, the manifold 7 and deflector 12 may be rotatable, by suitable means ~not shown) so as to-position the inlet in the most advantageous position.
A suitable electrical cord and connection means, and switch, (not shown) are provided in the usual way.
Having described what is believed to be the bes-t mode by which the invention may be performed, it will be seen that the invention may be particularly defined as follows:
3~3 A drill comprising a housing forming a motor space, an electric drive motor located within said motor space, an air intake manifold located on said housing and forming a passage for drawing in ambient air and directing the air into said motor space, said intake manifold having an air inlet opening, a deflector shield spaced outwardly from and covering said inlet opening for limiting the flow of water spray into said inlet opening, at least one filter located in said passage in said intake manifold for removing water in the air flowing through said passage, a labyrinth air passage located between said inlet manifold and said motor space forming a tortuous flow path for the air flow from said intake manifold into said motor space, an outlet manifold mounted on said housing and in air flow communication with said motor space for discharging the air after the passage thereof through said motor space, and means associated with said outlet manifold for preventing water spray from flowing through said outlet manifold into said motor space.
The invention further comprises such a drill, wherein said means for preventing water spray from flowing through said outlet
The present invention is directed to a drill with a spray-proof electric drive motor located within an air-cooled motor space.
Drills and other electrically driven hand-held tools are subjected in a plurality of applications to moisture from water spray or the like. The occurence of water spray may, for example, have an undesirable side effect on motor cooling at a working location. As is well known, water spray occurs when a tool is used in the rain.
Normally, drills dxiven by an electric motor are air-cooled. In conventional drills, there is the problem that water spray may penetrate into the motor space along with the cooling air, so that the operator is subjected to the danger of exposure to high voltages.
In drills using three-phase motors or capacitor motors which have performance characteristics that are extremely unfavorable for drills, this problem has been obviated by a two-shell housing with the inner shell of the housing being a water-tight enclosure forming the motor space. To effect cooling, air is conducted between the inner shell and the outer shell.
In motors of the above-mentioned type, such so-called jacket ventilation effects in many cases only an insufficient cooling, accordingly, it is not suitable for drills, a majority of which are equipped with universal motors. Universal motors are distinguished, on the one hand, by favorable performance characteristics and, on the other hand, they have a low weight and a small volume as compared to three-phase motors.
Therefore, it is the primary object of the present invention tO provide an electric motor driven drill with water .,~.~".
~ ~35~
spray protection combined with air cooling which is effective for universal motors.
In accordance with the present invention, for cooling the motor, an intake manifold is provided which directs air into the motor space and a deflector shield is located over the intake opening. At least one filter is positioned within the intake manifold and a labyrinth air passage is positioned between the filter and the motor space. The labyrinth air passage provides a tortuous flow path for the air entering the motor space. After the cooling air flows over the motor it is conducted out of the drill through an oulet manifold. The outlet manifold is arranged for preventing water spray from entering into the motor space.
The intake manifold for the cooling air, with a deflector shield located in front of its inlet and with a filter within its flow path, prevents any direct penetration of water spray such as when the tool is used in an area where water spray is present. In addition, the flow passage within the intake manifold serves as a space for guiding the drawn-in air.
In this inflow passage, moisture precipitates out which might not have been removed by the first filter. Moisture can be discharged from the intake manifold by conventional means, such as a one-way valve.
To ensure that the cooling flow is deflected in any position in which the drill is used, advantageously, the intake manifold is pivotally or flexibly mounted so tha't its intake opening can be adjusted in the direction least affected by the water spray.
After the cooling air flow has been filtered within the intake manifold or by means associated with the manifold, it ~135~
reaches a labyrinth air passage where it is sharply deflected several times by baffles located within the labyrinth passage so that the air flow follows a tortuous path. This tortuous flow path results in a separation of any remaining water droplets from the cooling air stream. The individual chambers within the labyrinth air passage are arranged so that any accumulated separated moisture cannot penetrate into the motor space in any position in which the hand-held tool is used. The intake manifold is coupled to the drill housing containing the labyrinth air passage such as by a flange connection. For easy manipulation, it is advantageous to construct such a connection so that i~ is releasable by means of a coded plug-in connection associated with the current supply. As a result, it can be ensured in a simple manner that, when the intake manifold is not coupled to the housing, the current supply to the motor is interrupted and operation of the hand-held tool is not possible.
The moisture-free air reaching the motor space from the labyrinth air passage, for effecting cooling of the drive motor, is drawn into the motor space by a radial ventilator connected to the motor and is discharged into the ambient air through an outlet manifold. The outlet manifold has a closure member for preventing water spray or moisture from passing through the outlet manifold into the motor space when the drill is no,t operating.
Preferably, the intake manifold has a curvature of about 180 around the housing for deflecting the cooling flow.
In this way it can be safely ensured that the cooling flow is sufficiently deflected between the opening into the intake manifold and the labyrinth air passage independent of the position in which the drill is used.
~s~
Further, to ensure that the outlet manifold for the cooling air exiting from the motor space prevents any penetration of water spray in any position in which the drill is used, particularly when the drill is not in operation, another feature of the invention is the provision of the outlet manifold with a curvature of 180 for deflecting the outlet flow of cooling air.
Any moisture which might possibly penetrate the first filter within the intake maniold can be removed by a fine filter in spaced relationship with the first filter. Any water residue passing through the first filter is collected in the space between the two filters.
Preferably, the closure at the entry into the outlet manifold is in the form of a filter. To discharge any water which may have penetrated into the filter, an exit opening, for example, containing a one-way valve, may be positioned in the range of the filter.
In another embodiment, the closure for the outlet manifold can be provided in the form of a valve. A suitable closure, among others, is a fIap valve which closes the outlet manifold when the drill is not being used. Accordingly, such valves prevent any passage of water or moisture into the outlet manifold when the drill is not in operation.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages and specific objects attained by its use, reference should be had to the accompanying drawings and descriptive matter in which there are illustrated and described preferred embodiments of the invention.
3~q3 IN THE DRAWING:
Fig. 1 is a side view, partly in section, of a stylized representation of a drill embodying the present invention, and, Fig~ la is another embodiment of detail A indicated in Fig. 1.
In Fig. l a somewhat schematic showing of a hand-held drill is provided including a housing 1 having a forward portion 2, that is the lower portion as viewed in the drawing with a motor 3 within the forward portion, and a rearward portion 4 forming a labyrinth air passage 5 for conducting air into the 'orward portion. Ribs or baffles 6 divide the labyrinth air passage 5 providing a tortuous path for the flow of cooling air.
In the range of the rearward portion 4 of the housing 1, that is, the upper part as viewed in Fig. 1, an intake manifold 7 is positioned around at least a portion of the housing l. A
first filter 8 is located in the intkae opening into the intake manifold 7. An annular disk 9 mounted within the intake manifold 7 prevents the filter from moving inwardly through the manifold.
First filter 8 is preferably a course filter and a fine filter ll is spaced along the path of flow of air within the intake manifold from the first filter l. Located at the inlet into the intake manifold 7 is a deflector shield 12 forming a cover in front of the inlet. The deflector shield 12 is fastened to the housing 1. Any water spray is prevented from flowing directly into the inlet opening of the intake manner 7 by the deflector shield. At the front end of the forward portion 2, that is, the opposite end from the labyrinth air passage 5, a radial ventilator 13 is fixed on motor shaft 3a and draws the cooling air flow indicated by the arrows from motor space 14 into an annular l~L36-3~
duct 15 within the housing and laterally surrounding the radial ventilator. The cooling air flows from the duct 15 into an outlet manifold 16 and then into the ambient atmosphere. Outlet manifold 16 is located around the front end of the forward portion 2 of the housing 1. Another filter 17 is located within the outlet manifold 16 so that the air flowing from the duct lS passes through the filter 17. A ring 22 located at the inlet into the outlet manifold, suppoxts the filter 17. The primary purpose of filter 17 is to prevent moisture from passing through the outlet manifold 16 into the interior of the housing when the drill is not in operation. Any water flowing through the outlet manifold to the filter 17 is caught at that location and can be discharged through a lateral discharge opening 18.
At the front or lower end of the housing 1 a tool, for example, a drill bit 19 is chucked into the drill.
In the arrangement as illustrated, while the drill is being operated, a flow of cooling air is drawn in between the deflector shield 12 and the inlet opening into the intake manifold 7 passing through the first filter 8 into the manifold duct. Any water finding its way through the filter 8 would be, to a large extent, collected in the next stage by the following fine filter 11 or in the baffle space 21 located between the two filters. After its passage through the fine filter 11 the cooling air flow changes direction entering the rear end of the rearward portion 4 of the housing and flowing along a tortuous path formed by the baffles 6 within the labyrinth air passage 5.
Within this labyrinth air passage 5, any remaining moisture particles are precipitated out. Any moisture precipitated in the form of drops in the intake manifold is prevented by the structure of the labyrinth air passage 5 from entering into ~3~
motor space 14 regardless of the position in which the drill is used.
For any extreme conditions of water spray, and for additional safety purposes, it may be advantageous to provide additional filters and baffles in the path of the cooling air flow before it enters the motor space 14. Furthermore, it may also be advantageous to provide similar measures in the region of the outlet manifold 16.
As can be seen in Fig. la, instead of the filter 17, a valve 23 is located at the entrance from the duct 15 into the outlet manifold 16. This valve prevents water from flowing from the outside through the outlet manifold 16 into the interior of the housing. Valve 23 is formed of a closing disk 24 of an elastic material, such as rubber, with a spring 25 biasing the disk 24 into a closed position against the ring 22. When the drill is in operation, the closing disk 24 is lifted off the ring 22 by the cooling air flow against the biasing force of the spring 25 so that the valve 23 is opened for the discharge - flow of the cooling air out of the drill.
Drain means, such as removable drain plug 26, is provided in rear portion 4, for removal of moisture. Any other suitable drain means such as a one way valve might also be used.
As described above, the manifold 7 and deflector 12 may be rotatable, by suitable means ~not shown) so as to-position the inlet in the most advantageous position.
A suitable electrical cord and connection means, and switch, (not shown) are provided in the usual way.
Having described what is believed to be the bes-t mode by which the invention may be performed, it will be seen that the invention may be particularly defined as follows:
3~3 A drill comprising a housing forming a motor space, an electric drive motor located within said motor space, an air intake manifold located on said housing and forming a passage for drawing in ambient air and directing the air into said motor space, said intake manifold having an air inlet opening, a deflector shield spaced outwardly from and covering said inlet opening for limiting the flow of water spray into said inlet opening, at least one filter located in said passage in said intake manifold for removing water in the air flowing through said passage, a labyrinth air passage located between said inlet manifold and said motor space forming a tortuous flow path for the air flow from said intake manifold into said motor space, an outlet manifold mounted on said housing and in air flow communication with said motor space for discharging the air after the passage thereof through said motor space, and means associated with said outlet manifold for preventing water spray from flowing through said outlet manifold into said motor space.
The invention further comprises such a drill, wherein said means for preventing water spray from flowing through said outlet
2~ manifold into said motor space comprises a filter located in said outlet manifold.
The invention further comprises such a drill, wherein said means associated with said outlet manifold for preventing water flow from flowing through said outlet manifold into said motor Spa~e comprises a valve for closing the flow passage into said outlet manifold from said housing when said drill is not in operation, and said valve being openable when the drill is in operation for permitting flow of cooling air therethrough after its passage through said motor space,and thence into said outlet manifold.
The invention further comprises such a drill, including ~3~3$~
drain means for draining moisture from said labyrinth air passage.
While specific embodiment of the invention have been shown and described in detail to illustrate the application of the inventive principles, it will be understood that the invention may be embodied otherwise without departing from such principles.
The invention further comprises such a drill, wherein said means associated with said outlet manifold for preventing water flow from flowing through said outlet manifold into said motor Spa~e comprises a valve for closing the flow passage into said outlet manifold from said housing when said drill is not in operation, and said valve being openable when the drill is in operation for permitting flow of cooling air therethrough after its passage through said motor space,and thence into said outlet manifold.
The invention further comprises such a drill, including ~3~3$~
drain means for draining moisture from said labyrinth air passage.
While specific embodiment of the invention have been shown and described in detail to illustrate the application of the inventive principles, it will be understood that the invention may be embodied otherwise without departing from such principles.
Claims (8)
1. A drill comprising a housing forming a motor space, an electric drive motor located within said motor space, an air intake manifold located on said housing and forming a passage for drawing in ambient air and directing the air into said motor space, said intake manifold having an air inlet opening, a deflector shield spaced outwardly from and covering said inlet opening for limiting the flow of water spray into said inlet opening, at least one filter located in said passage in said intake manifold for removing water in the air flowing through said passage, a labyrinth air passage located between said inlet manifold and said motor space forming a tortuous flow path for the air flow from said intake manifold into said motor space, an outlet manifold mounted on said housing and in air flow communication with said motor space for discharging the air after the passage thereof through said motor space, and means associated with said outlet manifold for preventing water spray from flowing through said outlet manifold into said motor space.
2. A drill, as set forth in claim 1, wherein said inlet manifold extends around said housing for an annular extent of approximately 180° for deflecting the flow of cooling air into said housing.
3. A drill, as set forth in claim 1 or 2, wherein said outlet manifold extends around said housing for an annular extent of approximately 180° for deflecting the flow of cooling air passing out of said housing.
4. A drill, as set forth in claim 1, wherein a fine filter being located within said inlet manifold in spaced relation from said at least one filter for filtering the flow of cooling air after it has passed through said at least one filter.
5. A drill, as set forth in claim 1, wherein said means for preventing water spray from flowing through said outlet manifold into said motor space comprises a filter located in said outlet manifold.
6. A drill, as set forth in claim 1, wherein said means associated with said outlet manifold for preventing water flow from flowing through said outlet manifold into said motor space comprises a valve for closing the flow passage into said outlet manifold from said housing when said drill is not in operation, and said valve being openable when the drill is in operation for permitting flow of cooling air therethrough after its passage through said motor space, and thence into said outlet manifold.
7. A drill as claimed in claims 1,5 or 6 including drain means for draining moisture from said labyrinth air passage.
8. A drill as claimed in claims 1,5 or 6 wherein said intake manifold and shield are rotatable about the axis of said motor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP2944274.8 | 1979-11-02 | ||
| DE19792944274 DE2944274A1 (en) | 1979-11-02 | 1979-11-02 | DRILLING DEVICE WITH SPLASH-PROTECTED ELECTRIC DRIVE MOTOR |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1135390A true CA1135390A (en) | 1982-11-09 |
Family
ID=6084977
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000363331A Expired CA1135390A (en) | 1979-11-02 | 1980-10-27 | Waterproof electric drive motor for a drill |
Country Status (15)
| Country | Link |
|---|---|
| JP (1) | JPS5669013A (en) |
| AU (1) | AU6254180A (en) |
| BE (1) | BE885923A (en) |
| CA (1) | CA1135390A (en) |
| DE (1) | DE2944274A1 (en) |
| DK (1) | DK462980A (en) |
| ES (1) | ES496467A0 (en) |
| FI (1) | FI802038A (en) |
| FR (1) | FR2468430A1 (en) |
| GB (1) | GB2062361A (en) |
| IT (1) | IT1132518B (en) |
| NL (1) | NL8004104A (en) |
| NO (1) | NO803257L (en) |
| SE (1) | SE8006324L (en) |
| YU (1) | YU210080A (en) |
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| GB2075240B (en) * | 1980-03-05 | 1985-03-13 | Papst Motoren Kg | Disc storage drive |
| GB2276987B (en) * | 1993-04-09 | 1996-05-15 | Koito Mfg Co Ltd | Waterproof construction of a pump-and-motor unit for use in windshield washer systems or the like |
| GB2278736A (en) * | 1993-06-05 | 1994-12-07 | Aggreko Generators Ltd | Enclosures for generator sets |
| US6443675B1 (en) * | 2000-02-17 | 2002-09-03 | Roto Zip Tool Corporation | Hand-held power tool |
| EP1990149B1 (en) | 2000-08-11 | 2010-11-03 | Milwaukee Electric Tool Corporation | Router |
| US20040035495A1 (en) * | 2002-08-21 | 2004-02-26 | Hessenberger Jeffrey C. | Router |
| JP4541958B2 (en) * | 2005-04-14 | 2010-09-08 | 株式会社マキタ | Impact tools |
| GB2435235A (en) * | 2007-02-09 | 2007-08-22 | Chervon Ltd | Waterproof air cooling system for power tool |
| USD611509S1 (en) | 2007-08-20 | 2010-03-09 | Milwaukee Electric Tool Corporation | Portion of a router |
| US7900661B2 (en) | 2007-08-20 | 2011-03-08 | Milwaukee Electric Tool Corporation | Plunge router and kit |
| DE102008016889B4 (en) * | 2008-04-02 | 2014-03-20 | Siemens Aktiengesellschaft | Housing attachment for an electrical machine with degree of protection IP 24W |
| US8011114B2 (en) | 2009-12-04 | 2011-09-06 | Superior Investments, Inc. | Vehicle dryer with butterfly inlet valve |
| JP5462726B2 (en) * | 2010-06-21 | 2014-04-02 | 株式会社ケーヒン | Blower unit |
| CN106112059A (en) * | 2016-08-12 | 2016-11-16 | 无锡百禾工业机器人有限公司 | A kind of semi-automatic protable driller |
| DE102017121448B3 (en) * | 2017-09-15 | 2018-12-06 | SCHOTT Diamantwerkzeuge GmbH | Cooling system for an ultrasonic drill |
| FR3083033B1 (en) * | 2018-06-22 | 2020-05-29 | Renault S.A.S | ELECTRIC MACHINE COOLED BY A DIELECTRIC HEAT LIQUID |
| JP7340385B2 (en) * | 2019-08-13 | 2023-09-07 | 株式会社やまびこ | electric work equipment |
| CN114643381B (en) * | 2022-05-19 | 2022-09-13 | 苏州卡罗伊精密刀具有限公司 | Rotary cutter convenient to dismouting and location |
Family Cites Families (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE7117707U (en) * | 1971-08-19 | General Motors Ltd | Electric motor | |
| GB274553A (en) * | 1926-04-20 | 1927-07-20 | Diamond Coal Cutter Company Lt | Improvements in or relating to the ventilation or pressure relief of fireproof electrical apparatus |
| FR714098A (en) * | 1931-03-31 | 1931-11-06 | Cuinier Pere Et Fils | Device intended to protect electric motors against the entry of foreign bodies, while allowing air cooling |
| CH167282A (en) * | 1932-11-03 | 1934-02-15 | Oerlikon Maschf | Device for reducing airborne noise from electrical machines. |
| DE866517C (en) * | 1938-12-14 | 1953-02-09 | Siemens Ag | Splash water protection for electrical machines or the like. |
| DE727563C (en) * | 1939-07-27 | 1942-11-06 | Hans Still | Splash and splash water protection device for the air inlet openings of electrical machines and devices |
| DE944143C (en) * | 1942-01-29 | 1956-06-07 | Sachsenwerk Licht & Kraft Ag | Splash-proof cover of air openings on the top of electrical machines and apparatus |
| GB554289A (en) * | 1942-07-31 | 1943-06-28 | Richard Bohaty | Improvements in dust traps |
| DE1088604B (en) * | 1958-02-13 | 1960-09-08 | Siemens Ag | All-weather protected electrical machine for ventilation |
| DE1126983B (en) * | 1961-03-22 | 1962-04-05 | Licentia Gmbh | All-weather protection for electrical machines of unprotected design |
| FR1315698A (en) * | 1962-02-23 | 1963-01-18 | Licentia Gmbh | All-weather protective housing for electrical machinery of unprotected construction |
| DE1438367B2 (en) * | 1962-06-15 | 1970-02-19 | Siemens AO, 1000 Berlin u. 8000 München | Weather protection box for a ventilated electrical machine |
| DE1438372B2 (en) * | 1962-08-24 | 1970-05-27 | Siemens AG, 1000 Berlin u. 8000 München | Weather protection box for a ventilated electrical machine |
| AT244434B (en) * | 1963-04-11 | 1966-01-10 | Siemens Ag | All-weather protection for open electrical machines with bearing blocks and base frames |
| FR1430880A (en) * | 1963-04-11 | 1966-03-11 | Siemens Ag | Weather protection device for uncovered electrical machines mounted on a base |
| DE1263161B (en) * | 1965-05-19 | 1968-03-14 | Siemens Ag | Pass-through ventilated electric motor for hoists |
| CH482340A (en) * | 1968-04-01 | 1969-11-30 | Siemens Ag | Self-ventilating electrical machine, in particular a railway engine |
| DE1948250B2 (en) * | 1968-09-27 | 1973-02-22 | North, Clifford Dornen, Johannes bürg (Sudafrika) | FIRE WEATHER PROTECTION TRAINED AS FILTERS ON THE VENTILATION OPENINGS OF AN ELECTRIC MACHINE |
| GB1321456A (en) * | 1970-05-07 | 1973-06-27 | Gen Motors Ltd | Electric motors |
| DE2048255A1 (en) * | 1970-10-01 | 1972-04-06 | Bbc Brown Boveri & Cie | |
| DE2129424A1 (en) * | 1971-06-14 | 1972-12-21 | Reinhard Freund Maschb | Universal motor with labyrinth-like openings for ventilation for the purpose of splash protection |
| CA979471A (en) * | 1972-03-22 | 1975-12-09 | Rockwell International Corporation | Power tools |
| DE2617860C2 (en) * | 1976-04-23 | 1986-07-10 | Flux-Geräte GmbH, 7000 Stuttgart | Electric pump motor in splash-proof design |
-
1979
- 1979-11-02 DE DE19792944274 patent/DE2944274A1/en not_active Withdrawn
-
1980
- 1980-06-25 FI FI802038A patent/FI802038A/en not_active Application Discontinuation
- 1980-07-07 IT IT23287/80A patent/IT1132518B/en active
- 1980-07-16 NL NL8004104A patent/NL8004104A/en not_active Application Discontinuation
- 1980-07-24 GB GB8024277A patent/GB2062361A/en not_active Withdrawn
- 1980-08-21 YU YU02100/80A patent/YU210080A/en unknown
- 1980-09-10 SE SE8006324A patent/SE8006324L/en not_active Application Discontinuation
- 1980-09-19 AU AU62541/80A patent/AU6254180A/en not_active Abandoned
- 1980-10-02 JP JP13683980A patent/JPS5669013A/en active Pending
- 1980-10-17 FR FR8022280A patent/FR2468430A1/en active Pending
- 1980-10-27 CA CA000363331A patent/CA1135390A/en not_active Expired
- 1980-10-29 BE BE0/202630A patent/BE885923A/en not_active IP Right Cessation
- 1980-10-31 ES ES496467A patent/ES496467A0/en active Granted
- 1980-10-31 NO NO803257A patent/NO803257L/en unknown
- 1980-10-31 DK DK462980A patent/DK462980A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| SE8006324L (en) | 1981-05-03 |
| FI802038A (en) | 1981-05-03 |
| DE2944274A1 (en) | 1981-05-14 |
| AU6254180A (en) | 1981-06-25 |
| JPS5669013A (en) | 1981-06-10 |
| NO803257L (en) | 1981-05-04 |
| ES8107072A1 (en) | 1981-10-01 |
| NL8004104A (en) | 1981-06-01 |
| IT1132518B (en) | 1986-07-02 |
| GB2062361A (en) | 1981-05-20 |
| IT8023287A0 (en) | 1980-07-07 |
| DK462980A (en) | 1981-05-03 |
| ES496467A0 (en) | 1981-10-01 |
| FR2468430A1 (en) | 1981-05-08 |
| YU210080A (en) | 1983-06-30 |
| BE885923A (en) | 1981-02-16 |
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Legal Events
| Date | Code | Title | Description |
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| MKEX | Expiry |