CA1137416A - Drilling and chipping hammer with internal combustion engine drive - Google Patents
Drilling and chipping hammer with internal combustion engine driveInfo
- Publication number
- CA1137416A CA1137416A CA000333221A CA333221A CA1137416A CA 1137416 A CA1137416 A CA 1137416A CA 000333221 A CA000333221 A CA 000333221A CA 333221 A CA333221 A CA 333221A CA 1137416 A CA1137416 A CA 1137416A
- Authority
- CA
- Canada
- Prior art keywords
- flywheel
- crankshaft
- hand tool
- set forth
- housing
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
- B25D9/06—Means for driving the impulse member
- B25D9/10—Means for driving the impulse member comprising a built-in internal-combustion engine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
- F02B63/02—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for hand-held tools
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Percussive Tools And Related Accessories (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
- Drilling And Boring (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
- Earth Drilling (AREA)
- Portable Power Tools In General (AREA)
- Soil Working Implements (AREA)
- Retarders (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
In a drilling and chipping hammer driven by an internal combustion engine, a flywheel is connected to the engine crankshaft. A planetary gear system transmits the rotational movement of the crankshaft to the flywheel so that the revolutions per minute of the flywheel are raised above the revolutions per minute of the crankshaft.
In a drilling and chipping hammer driven by an internal combustion engine, a flywheel is connected to the engine crankshaft. A planetary gear system transmits the rotational movement of the crankshaft to the flywheel so that the revolutions per minute of the flywheel are raised above the revolutions per minute of the crankshaft.
Description
113~7416 The present invention is d:Lrected to a hand tool and in particular to a drilling and chipping hammer which is driven by an internal combustion engine and has a fly-wheel connected to the engine crankshaft.
~ land tools of the general type to which the invention is directed, are used for heavy duty work and at remote construction sites where no electrical current supply is available. An advantage of these tools over electrically operated ones is their great mobility. As compared to electrically operated tools, known internal combustion engine operated units weigh considerably more, operate at significantly higher noise levels and develop greater vibrations.
Working with presently known internal combustion engine operated units over long periods of time can be very tiring. To compensate, on the one hand, for engine drive irregularities and, on the other hand, for the timed shift between internal combustion engine power output and hammer power consumption, known drilling and chipping ~0 hammers have been equipped with a flywheel connected to the engine crankshaft. The flywheel stored energy must be sufficiently high to cover the percussion work required by the hammer mechanism and the internal combustion engine compression work without any increased rpm output. To prevent increased engine rpm and, accordingly, undesirable noise levels when the tool is lifted free from the surface being worked, known tools have been provided with throttling devices which cause the engine to idle. These throttling devices can be manually or automatically actuated. To prevent the engine from "dying" at minimal ~ ' 1~L37~1~
idling during operational pauses and primarily on operational restarts, the flywheel must have a specific flywheel moment. Such a characteristic is possible with a flywheel of sufficiently large size, however, difficulties are presented where the size of the flywheel is limited by weight and positional factors.
With presently known internal combustion engine operated hand tools, so-called high-speed engines are utilized where the required output is achieved only at relatively high nominal speed. Such operation, however, produces extremely high noise levels and strong vibrations and, accordingly, such units are a health menace and are not adapted for continuous operation. In the case of slow moving engines, however, large and heavy flywheels are required which render the tool unsuitable for use as a portable unit.
The primary object of the present invention is to provide a light weight hand tool capable of operation at low engine rpm.
In accordance with the present invention a transmission gearing system is provided between the crank-shaft and the flywheel which raises the flywheel rpm over the crankshaft rpm. Since the energy content of a flywheel quadruples with rpm, the effect is a saving in total unit weight and a reduction in engine rpm even with the added transmission gearing system.
With small sized hand tools, the flywheel normally assumes other functions. Usually, the flywheel is employed as a fan providing a flow of engine cooling air. With increased flywheel rpm, a considerably higher 1137~16 air throughput is achieved so that even with continuous tool operation, despite a reduced flywheel diameter, adequate engine cooling is accomplished. secause the fly-wheel in most cases also serves as an ignition spark generatOr, the ignition voltage can be maintained at a somewhat constant rate even at low engine drive rpm.
Another advantageous feature of the transmission gearing system of the present invention which increases the fly-wheel rpm over that of the crankshaft, is the positional stabilization of the overall unit by the flywheel gyro-scope effect. As a result, any undesirable tilting motion during operation caused by eccentrically acting forces can, to a large degree, be prevented. Further, the unit also operates at a substantially lower vibration rate.
Both for positional and weight related reasons, it is advantageous to provide a transmission gearing system of a very compact design. Accordingly, it is advantageous to provide the transmission gearing system as a planetary ~ -gear system. Furthermore, a planetary gear system can be arranged coaxially with the crankshaft so that the external shape of the hand tool i5 not adversely affected to any practical extent.
For affording an optimum transmission of force and also for dimensional reasons, it is advantageous to provide a planetary gear system including a crankshaft driven planetary gear crosspiece, a gear ring fixed to the housing, and a sun wheel coupled to the flywheel. Two or more planet wheels can be mounted on the crosspiece in meshed engagement with the gear ring and the sun wheel so that a uniform power distribution is achieved.
1~L37~
For practical reasons, the transmission ratio between the crankshaft and the flywheel is limited. The added transmission gearing system cancels a part of the potential saving in the weight of the flywheel. Accordingly, the rpm of the flywheel is considerably raised over that of the crankshaft. However, the nominal engine driven fly-wheel rpm must not be set too high, because the gyroscope effect of the flywheel becomes so strong that handling the tool is almost impossible. To achieve an optimal mean value, it is desirable to set the transmission ration at 1:3. The transmission ratio must be a whole number multiple because the flywheel picks up the magneto for an ignition coil induction effect.
The various features of novelty which charac--terize 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.
IN THE DRAWING:
Figure 1 is a side view, partly in section, of a drilling and chipping hammer embodying the present invention;
and Figure 2 is a sectional view taken along the line II-II in Figure 1 and illustrated on an enlarged scale.
In Figure 1 a drilling and chipping hammer is illustrated enclosed within a housing 1. As viewed in Figure 1, the right-hand end of the housing 1 contains a 1~37gl6 handle 2. At the left-hand or front end of the housing 1 a tool holder 3 is positioned. Within the housiny 1, an engine drive crankshaft 4 is rotatably supported. A piston rod 5 is connected to a crank arm 4a of the crankshaft. At its opposite end from the crankshaft, the piston rod 5 is connected to an engine drive piston 6. As seen in Figure 1, a crank 7 is positioned at the upper end of crankshaft 4 and is connected to the crankshaft by a threaded section 4b. A crank stud 7a projects from one side of the crank 7 and a hammer mechanism piston rod 8 is rotatably attached to the crank stud. The opposite end of the piston rod from the crank 7 is connected to a drive piston 9 which is located within a liner 10.
At its lower end, that is the opposite end from the crank 7, the crankshaft 4 is encircled by a planetary gear system. The planetary gear system includes a cross-piece 11 fixed to the crankshaft. As can be seen in Figure
~ land tools of the general type to which the invention is directed, are used for heavy duty work and at remote construction sites where no electrical current supply is available. An advantage of these tools over electrically operated ones is their great mobility. As compared to electrically operated tools, known internal combustion engine operated units weigh considerably more, operate at significantly higher noise levels and develop greater vibrations.
Working with presently known internal combustion engine operated units over long periods of time can be very tiring. To compensate, on the one hand, for engine drive irregularities and, on the other hand, for the timed shift between internal combustion engine power output and hammer power consumption, known drilling and chipping ~0 hammers have been equipped with a flywheel connected to the engine crankshaft. The flywheel stored energy must be sufficiently high to cover the percussion work required by the hammer mechanism and the internal combustion engine compression work without any increased rpm output. To prevent increased engine rpm and, accordingly, undesirable noise levels when the tool is lifted free from the surface being worked, known tools have been provided with throttling devices which cause the engine to idle. These throttling devices can be manually or automatically actuated. To prevent the engine from "dying" at minimal ~ ' 1~L37~1~
idling during operational pauses and primarily on operational restarts, the flywheel must have a specific flywheel moment. Such a characteristic is possible with a flywheel of sufficiently large size, however, difficulties are presented where the size of the flywheel is limited by weight and positional factors.
With presently known internal combustion engine operated hand tools, so-called high-speed engines are utilized where the required output is achieved only at relatively high nominal speed. Such operation, however, produces extremely high noise levels and strong vibrations and, accordingly, such units are a health menace and are not adapted for continuous operation. In the case of slow moving engines, however, large and heavy flywheels are required which render the tool unsuitable for use as a portable unit.
The primary object of the present invention is to provide a light weight hand tool capable of operation at low engine rpm.
In accordance with the present invention a transmission gearing system is provided between the crank-shaft and the flywheel which raises the flywheel rpm over the crankshaft rpm. Since the energy content of a flywheel quadruples with rpm, the effect is a saving in total unit weight and a reduction in engine rpm even with the added transmission gearing system.
With small sized hand tools, the flywheel normally assumes other functions. Usually, the flywheel is employed as a fan providing a flow of engine cooling air. With increased flywheel rpm, a considerably higher 1137~16 air throughput is achieved so that even with continuous tool operation, despite a reduced flywheel diameter, adequate engine cooling is accomplished. secause the fly-wheel in most cases also serves as an ignition spark generatOr, the ignition voltage can be maintained at a somewhat constant rate even at low engine drive rpm.
Another advantageous feature of the transmission gearing system of the present invention which increases the fly-wheel rpm over that of the crankshaft, is the positional stabilization of the overall unit by the flywheel gyro-scope effect. As a result, any undesirable tilting motion during operation caused by eccentrically acting forces can, to a large degree, be prevented. Further, the unit also operates at a substantially lower vibration rate.
Both for positional and weight related reasons, it is advantageous to provide a transmission gearing system of a very compact design. Accordingly, it is advantageous to provide the transmission gearing system as a planetary ~ -gear system. Furthermore, a planetary gear system can be arranged coaxially with the crankshaft so that the external shape of the hand tool i5 not adversely affected to any practical extent.
For affording an optimum transmission of force and also for dimensional reasons, it is advantageous to provide a planetary gear system including a crankshaft driven planetary gear crosspiece, a gear ring fixed to the housing, and a sun wheel coupled to the flywheel. Two or more planet wheels can be mounted on the crosspiece in meshed engagement with the gear ring and the sun wheel so that a uniform power distribution is achieved.
1~L37~
For practical reasons, the transmission ratio between the crankshaft and the flywheel is limited. The added transmission gearing system cancels a part of the potential saving in the weight of the flywheel. Accordingly, the rpm of the flywheel is considerably raised over that of the crankshaft. However, the nominal engine driven fly-wheel rpm must not be set too high, because the gyroscope effect of the flywheel becomes so strong that handling the tool is almost impossible. To achieve an optimal mean value, it is desirable to set the transmission ration at 1:3. The transmission ratio must be a whole number multiple because the flywheel picks up the magneto for an ignition coil induction effect.
The various features of novelty which charac--terize 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.
IN THE DRAWING:
Figure 1 is a side view, partly in section, of a drilling and chipping hammer embodying the present invention;
and Figure 2 is a sectional view taken along the line II-II in Figure 1 and illustrated on an enlarged scale.
In Figure 1 a drilling and chipping hammer is illustrated enclosed within a housing 1. As viewed in Figure 1, the right-hand end of the housing 1 contains a 1~37gl6 handle 2. At the left-hand or front end of the housing 1 a tool holder 3 is positioned. Within the housiny 1, an engine drive crankshaft 4 is rotatably supported. A piston rod 5 is connected to a crank arm 4a of the crankshaft. At its opposite end from the crankshaft, the piston rod 5 is connected to an engine drive piston 6. As seen in Figure 1, a crank 7 is positioned at the upper end of crankshaft 4 and is connected to the crankshaft by a threaded section 4b. A crank stud 7a projects from one side of the crank 7 and a hammer mechanism piston rod 8 is rotatably attached to the crank stud. The opposite end of the piston rod from the crank 7 is connected to a drive piston 9 which is located within a liner 10.
At its lower end, that is the opposite end from the crank 7, the crankshaft 4 is encircled by a planetary gear system. The planetary gear system includes a cross-piece 11 fixed to the crankshaft. As can be seen in Figure
2, pins 12 are secured to and extend outwardly from the crosspiece 11. A planet gear wheel 1~ is mounted on each of the pins 12, there being three planet gear wheels in all, equiangularly spaced apart. Each planet wheel 13 is in meshed engagement with an annulus or gear ring 14 located outwardly from the crosspiece and encircling the crankshaft.
The gear ring is fixed to the housing 1. Rotatably mounted on the crankshaft and located inwardly of the planet wheels 13, is a sun gear wheel 15a. The sun wheel l5a is formed as a part of a flywheel 15. A bearing bush 16 rotatably supports the integral flywheel 15 and sun wheel 15a on the crankshaft 4. The rpm of the flywheel is raised over the rpm of the crankshaft 4 by the planetary gear system made ., .. .. =.. .. .
113~6 up of the crosspiece 11, the planet wh~els 13, the gear ring 14 and the sun wheel 15a.
In Fiyure 2 it can be seen that the planetary gear system includes three pins 12 space~ angularly apart on the crosspiece 11. Each pin 12 supports one of the planet wheels 13. Radially inwardly, each planet wheel 13 is in meshed engagement with the centrally arranged sun wheel 15a and radially outwardly each planet wheel is in meshed engagement with the gear ring 14. While three ` 10 planet wheels are illustrated, it is to be understood that this is only shown for purposes of example. Instead of three planet wheels a single planet wheel could be used or more than three planet wheels could be employed.
As explained above, the ignition system for the internal combustion engine, indicated generally by the piston 6 and connecting rod 5, is provided by a magneto-type system, indicated generally by reference 17, located to one side of the flywheel 15.
This is of course the simplest ignition system for this type of internal combustion engine, although the invention is not absolutely dependent thereon, and where any other suitable form of ignition system may be substi-tuted for such a magneto 17, then it is to be deemed to be included within the scope of the invention in its broader concepts.
As shown in this embodiment of the invention however wherersuch.a mag~eto system is used, and where its operation is related to the flywheel 15, then it is of course apparent to those skilled in the art that the fly-wheel 15 will have to rotate at a pre-determined whole . ...
" 1137~16 number of rpm's relative to the rpm of the crankshaft 4, since ~he timing in the ignition spark is, of course, dependent upon the rotation of the flywheel 15 in this particular case.
As mentioned, however, where the ignition spark is procured by, or is timed by some other mechanism, that is not directly related to the rpm's of the flywheel 15, then of course such a whole number relationship is not a prerequisite.
The operation of the invention as shown is self-evident.
Rotation of the crankshaft 4 will, through the planetary gear system, procure a rotation of the flywheel ; 15 at a predetermined whole number rpm greater than that ofthe crankshaft 4. As mentioned, in the particular case indicated, the ratio is 1:3, this particular ratio having been found to produce an optimum result in practice, for the reasons described above.
Having described what is believed to be the best mode by which the invention may be performed, it will be seen that the invention may be particularly defined as follows: -- A hand tool, such as a drilling and chipping hammer, comprising a housing, an internal combustion engine including an engine crankshaft located within said housing, a flywheel mounted on said engine crankshaft and located within said housing, wherein the improvement comprises balanced transmission means located within said housing and positioned between said crankshaft and said flywheel for transmitting the rotational movement of said crankshaft to 1~3~16 said flywheel and for raising the revolutions per minute of said flywheel over the revolutions per minute of said crank-shaft.
The invention further comprises a hand tool having the foregoing features and wherein said transmission means comprises a planetary gear system.
The invention further comprises a hand tool having the foregoing features and wherein the internal combustion engine incorporates an ignition system, and wherein the ignition system is operated in timed relation to the rotation of the flywheel, and wherein the trans-mission means operates the flywheel at a ratio of rpm's which is a whole number in relation to the rpm's of the crankshaft.
The invention further comprises a hand tool having the forego~ng features and wherein the transmission ratio of said planetary gear system between said crankshaft and said flywheel is 1:3.
While specific embodiments of the invention have been shown and described in detail to illustrate the application of the inventive principles, it will be under-stood that the invention may be embodied otherwise without departing from such principles.
The gear ring is fixed to the housing 1. Rotatably mounted on the crankshaft and located inwardly of the planet wheels 13, is a sun gear wheel 15a. The sun wheel l5a is formed as a part of a flywheel 15. A bearing bush 16 rotatably supports the integral flywheel 15 and sun wheel 15a on the crankshaft 4. The rpm of the flywheel is raised over the rpm of the crankshaft 4 by the planetary gear system made ., .. .. =.. .. .
113~6 up of the crosspiece 11, the planet wh~els 13, the gear ring 14 and the sun wheel 15a.
In Fiyure 2 it can be seen that the planetary gear system includes three pins 12 space~ angularly apart on the crosspiece 11. Each pin 12 supports one of the planet wheels 13. Radially inwardly, each planet wheel 13 is in meshed engagement with the centrally arranged sun wheel 15a and radially outwardly each planet wheel is in meshed engagement with the gear ring 14. While three ` 10 planet wheels are illustrated, it is to be understood that this is only shown for purposes of example. Instead of three planet wheels a single planet wheel could be used or more than three planet wheels could be employed.
As explained above, the ignition system for the internal combustion engine, indicated generally by the piston 6 and connecting rod 5, is provided by a magneto-type system, indicated generally by reference 17, located to one side of the flywheel 15.
This is of course the simplest ignition system for this type of internal combustion engine, although the invention is not absolutely dependent thereon, and where any other suitable form of ignition system may be substi-tuted for such a magneto 17, then it is to be deemed to be included within the scope of the invention in its broader concepts.
As shown in this embodiment of the invention however wherersuch.a mag~eto system is used, and where its operation is related to the flywheel 15, then it is of course apparent to those skilled in the art that the fly-wheel 15 will have to rotate at a pre-determined whole . ...
" 1137~16 number of rpm's relative to the rpm of the crankshaft 4, since ~he timing in the ignition spark is, of course, dependent upon the rotation of the flywheel 15 in this particular case.
As mentioned, however, where the ignition spark is procured by, or is timed by some other mechanism, that is not directly related to the rpm's of the flywheel 15, then of course such a whole number relationship is not a prerequisite.
The operation of the invention as shown is self-evident.
Rotation of the crankshaft 4 will, through the planetary gear system, procure a rotation of the flywheel ; 15 at a predetermined whole number rpm greater than that ofthe crankshaft 4. As mentioned, in the particular case indicated, the ratio is 1:3, this particular ratio having been found to produce an optimum result in practice, for the reasons described above.
Having described what is believed to be the best mode by which the invention may be performed, it will be seen that the invention may be particularly defined as follows: -- A hand tool, such as a drilling and chipping hammer, comprising a housing, an internal combustion engine including an engine crankshaft located within said housing, a flywheel mounted on said engine crankshaft and located within said housing, wherein the improvement comprises balanced transmission means located within said housing and positioned between said crankshaft and said flywheel for transmitting the rotational movement of said crankshaft to 1~3~16 said flywheel and for raising the revolutions per minute of said flywheel over the revolutions per minute of said crank-shaft.
The invention further comprises a hand tool having the foregoing features and wherein said transmission means comprises a planetary gear system.
The invention further comprises a hand tool having the foregoing features and wherein the internal combustion engine incorporates an ignition system, and wherein the ignition system is operated in timed relation to the rotation of the flywheel, and wherein the trans-mission means operates the flywheel at a ratio of rpm's which is a whole number in relation to the rpm's of the crankshaft.
The invention further comprises a hand tool having the forego~ng features and wherein the transmission ratio of said planetary gear system between said crankshaft and said flywheel is 1:3.
While specific embodiments of the invention have been shown and described in detail to illustrate the application of the inventive principles, it will be under-stood that the invention may be embodied otherwise without departing from such principles.
Claims (8)
1. A hand tool, such as a drilling and chipping hammer, comprising a housing, an internal combustion engine including an engine crankshaft located within said housing, a flywheel mounted on said engine crankshaft and located within said housing, wherein the improvement comprises balanced transmission means located within said housing and positioned between said crankshaft and said flywheel for transmitting the rotational movement of said crankshaft to said flywheel and for raising the revolutions per minute of said flywheel over the revolutions per minute of said crankshaft.
2. A hand tool, as set forth in Claim 1, wherein said transmission means comprises a planetary gear system.
3. A hand tool, as set forth in Claim 1, wherein the internal combustion engine incorporates an ignition system, and wherein the ignition system is operated in timed relation to the rotation of the flywheel, and wherein the transmission means operates the flywheel at a ratio of rpm's which is a whole number in relation to the rpm's of the crankshaft.
4. A hand tool, as set forth in Claim 2, wherein said planetary gear system comprises a crosspiece secured to and driven by said crankshaft, a gear ring encircling and spaced outwardly from said crosspiece, said gear ring being fixed to said housing, and a sun wheel secured to said flywheel and located within said gear ring.
5. A hand tool, as set forth in Claim 4, wherein at least one planet wheel is mounted on said crosspiece and said planet wheel is disposed in meshed engagement with said sun wheel and said gear ring.
6. A hand tool, as set forth in Claim 4, wherein a plurality of planet wheels is mounted on said crosspiece with said planet wheels angularly spaced apart, said planet wheels each disposed in meshed engagement with said sun wheel and said gear ring.
7. A hand tool, as set forth in Claim 3, wherein the combination of said sun wheel and said flywheel are formed integrally with and are rotatably mounted on said crankshaft.
8. A hand tool, as set forth in Claim 2 wherein the transmission ratio of said planetary gear system between said crankshaft and said flywheel is 1:3.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2835569A DE2835569C2 (en) | 1978-08-14 | 1978-08-14 | Hammer drill and chisel hammer with combustion engine drive |
| DEP2835569.3 | 1978-08-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1137416A true CA1137416A (en) | 1982-12-14 |
Family
ID=6046998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000333221A Expired CA1137416A (en) | 1978-08-14 | 1979-08-03 | Drilling and chipping hammer with internal combustion engine drive |
Country Status (25)
| Country | Link |
|---|---|
| JP (1) | JPS5531588A (en) |
| AT (1) | AT366312B (en) |
| AU (1) | AU534895B2 (en) |
| BE (1) | BE878203A (en) |
| CA (1) | CA1137416A (en) |
| CH (1) | CH640768A5 (en) |
| CS (1) | CS208126B2 (en) |
| DD (1) | DD145242A5 (en) |
| DE (1) | DE2835569C2 (en) |
| DK (1) | DK149408C (en) |
| ES (1) | ES482954A1 (en) |
| FI (1) | FI65392C (en) |
| FR (1) | FR2433631B1 (en) |
| GB (1) | GB2030901B (en) |
| HU (1) | HU180244B (en) |
| IE (1) | IE48461B1 (en) |
| IT (1) | IT1125391B (en) |
| MX (1) | MX146698A (en) |
| NL (1) | NL7905145A (en) |
| NO (1) | NO147943C (en) |
| PL (1) | PL117509B1 (en) |
| SE (1) | SE7906632L (en) |
| SU (1) | SU1205781A3 (en) |
| YU (1) | YU40847B (en) |
| ZA (1) | ZA793381B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3936849A1 (en) * | 1989-11-06 | 1991-05-08 | Bosch Gmbh Robert | ELECTRICALLY DRIVED MACHINE TOOL |
| JP3772533B2 (en) * | 1998-07-14 | 2006-05-10 | 松下電工株式会社 | Rotating tool with transmission |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB189532A (en) * | 1921-08-31 | 1922-11-30 | Paul Shishkoff | Improvements in and relating to power transmission systems |
| US1743712A (en) * | 1924-01-28 | 1930-01-14 | Automotive Fan & Bearing Compa | Hub bearing |
| DE696263C (en) * | 1936-11-15 | 1940-09-18 | Heinrich Koch Dipl Ing | Three-cylinder star engine with perfect mass balance |
| FR832099A (en) * | 1937-02-02 | 1938-09-20 | Starting, transmission and braking device with regeneration | |
| US2214800A (en) * | 1939-06-29 | 1940-09-17 | Ingersoll Rand Co | Percussive tool |
| US2533847A (en) * | 1948-05-03 | 1950-12-12 | Chamberlin Corporany Of Americ | Weather strip installation for windows |
| US3095766A (en) * | 1961-03-31 | 1963-07-02 | Henry C Cox | Fan reversing mechanism |
| US3672244A (en) * | 1970-04-08 | 1972-06-27 | Algirdas L Nasvytis | Flywheel automotive vehicle |
-
1978
- 1978-08-14 DE DE2835569A patent/DE2835569C2/en not_active Expired
-
1979
- 1979-06-01 FI FI791773A patent/FI65392C/en not_active IP Right Cessation
- 1979-06-28 IT IT23951/79A patent/IT1125391B/en active
- 1979-07-02 NL NL7905145A patent/NL7905145A/en not_active Application Discontinuation
- 1979-07-03 GB GB7923148A patent/GB2030901B/en not_active Expired
- 1979-07-04 CH CH624679A patent/CH640768A5/en not_active IP Right Cessation
- 1979-07-06 ZA ZA793381A patent/ZA793381B/en unknown
- 1979-07-19 FR FR7918698A patent/FR2433631B1/en not_active Expired
- 1979-07-26 YU YU1826/79A patent/YU40847B/en unknown
- 1979-07-30 ES ES482954A patent/ES482954A1/en not_active Expired
- 1979-07-30 AT AT0523679A patent/AT366312B/en not_active IP Right Cessation
- 1979-08-02 CS CS795326A patent/CS208126B2/en unknown
- 1979-08-03 CA CA000333221A patent/CA1137416A/en not_active Expired
- 1979-08-03 MX MX178783A patent/MX146698A/en unknown
- 1979-08-06 SU SU792796858A patent/SU1205781A3/en active
- 1979-08-07 SE SE7906632A patent/SE7906632L/en unknown
- 1979-08-08 DD DD79214856A patent/DD145242A5/en unknown
- 1979-08-08 AU AU49690/79A patent/AU534895B2/en not_active Expired - Fee Related
- 1979-08-08 IE IE1470/79A patent/IE48461B1/en unknown
- 1979-08-10 JP JP10138779A patent/JPS5531588A/en active Granted
- 1979-08-10 HU HU79HI520A patent/HU180244B/en unknown
- 1979-08-10 BE BE0/196700A patent/BE878203A/en not_active IP Right Cessation
- 1979-08-13 PL PL1979217734A patent/PL117509B1/en unknown
- 1979-08-13 NO NO792623A patent/NO147943C/en unknown
- 1979-08-13 DK DK338579A patent/DK149408C/en not_active IP Right Cessation
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |