US3718193A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling system for portable impulse transmitting machines
Assignee: Robert Bosch GmbH
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Filing: 1971-02-18
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Granted: 1973-02-27
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Expires: 1991-02-18
Abstract
Abstract A portable impulse transmitting machine wherein an impeller assembly receives motion from an electric motor and serves to drive a tool into concrete, rock or like formations with attendant heating of the motor and impeller assembly. The housing of the machine forms part of the cooling system for the motor and the impeller assembly and accommodates a radial fan which is driven by the motor. A first portion of the housing has a plastic jacket which surrounds the impeller assembly and defines an annular passage one end of which is adjacent to the pressure side of the fan and the other end of which communicates with the atmosphere by way of one or more outlets. A second portion of the housing surrounds the motor and the fan and is provided with one or more inlets for admission of atmospheric air and with one or more channels which connect the inlets with the first end of the passage and draw substantial quantities of atmospheric air along the motor in response to rotation of the fan. A portion of the air which cools the motor is caused to flow through the passage to be expelled by way of the outlets and the housing is provided with additional outlets adjacent to the pressure side of the fan to permit escape of the remaining portion of air which is delivered by the channels.
Inventors
- 👤 K Wanner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:37
CPC Classifications
B; B25; B25D; B25D11/00; B25D11/06; B25D11/12; B25D11/125; B25D2211/00; B25D2211/003
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
218 words
In a portable impulse transmitting machine, a combination comprising an electric motor; an impeller assembly operable to transmit impulses to a material-penetrating tool; motion transmitting means for operating said assembly in response to operation of said motor with attendant heating of said motor and said assembly; and cooling means including a housing having a first portion surrounding said assembly and defining a passage provided with at least one first outlet to the atmosphere, said housing further having a second portion surrounding said motor and provided with at least one air-admitting inlet and at least one channel extending along said motor between said inlet and said passage in communication with the latter, and a rotary fan driven by said motor and mounted in said housing between said passage and said channel to draw at least one stream of atmospheric air through said inlet and said channel with attendant cooling of said motor and to force a first portion of said stream into said passage whereby such portion of said stream cools said assembly on its way into and through said first outlet, said housing further having at least one second outlet in the region of said fan and communicating with said channel for evacuation of the remaining portion of said air stream in response to rotation of said fan.
Claim 2
Dependent Claim
218 words
In a portable impulse transmitting machine, a combination comprising an electric motor; an impeller assembly operable to transmit impulses to a material-penetrating tool; motion transmitting means for operating said assembly in response to operation of said motor with attendant heating of said motor and said assembly; and cooling means including a housing having a first portion surrounding said assembly and defining a passage provided with at least one first outlet to the atmosphere, said housing further having a second portion surrounding said motor and provided with at least one air-admitting inlet and at least one channel extending along said motor between said inlet and said passage in communication with the latter, and a rotary fan driven by said motor and mounted in said housing between said passage and said channel to draw at least one stream of atmospheric air through said inlet and said channel with attendant cooling of said motor and to force a first portion of said stream into said passage whereby such portion of said stream cools said assembly on its way into and through said first outlet, said housing further having at least one second outlet in the region of said fan and communicating with said channel for evacuation of the remaining portion of said air stream in response to rotation of said fan.
Claim 3
Dependent Claim
51 words
A combination as defined in claim 1, wherein said fan is a radial fan having a suction side facing said motor and a pressure side, said second outlet and said passage being located at the pressure side of said fan so that the motor is cooled by the entire air stream.
Claim 4
Dependent Claim
52 words
A combination as defined in claim 1, wherein said fan is arranged to draw through said inlet and said channel atmospheric air at such a rate that the quantity of said first portion of said air stream is a small fraction of the quantity of said remaining portion of said air stream.
Claim 5
Dependent Claim
71 words
A combination as defined in claim 1, wherein said first portion of said housing comprises a tubular member immediately surrounding said impeller assembly and a tubular jacket surrounding said tubular member, said passage being provided between said tubular member and said jacket and having a first end adjacent to said fan and a second end remote from said fan, said first outlet being provided at the second end of said passage.
Claim 6
Dependent Claim
242 words
In a portable impulse transmitting machine, a combination comprising an electric motor; an impeller assembly operable to transmit impulses to a material-penetrating tool; motion transmitting means for operating said assembly in response to operation of said motor with attendant heating of said motor and said assembly; and cooling means including a housing having a first portion including a tubular member surrounding said assembly and a tubular jacket constituting an auxiliary handgrip and surrounding said tubular member so as to define therewith a passage having a first and a second end provided with at least one first outlet to the atmosphere, said housing further having a second portion surrounding said motor and provided with at least one air-admitting inlet and at least one channel extending along said motor between said inlet and said passage, and a rotary fan driven by said motor and mounted in said housing between said channel and said passage adjacent said first end of the latter to draw at least one stream of atmospheric air through said inlet and said channel with attendant cooling of said motor and to force a first portion of said stream into said passage thereby such portion of said stream cools said assembly on its way into and through said first outlet, said housing further having at least one second outlet in the region of said fan for evacuation of the remaining portion of said air stream in response to rotation of said fan.
Claim 7
Dependent Claim
242 words
In a portable impulse transmitting machine, a combination comprising an electric motor; an impeller assembly operable to transmit impulses to a material-penetrating tool; motion transmitting means for operating said assembly in response to operation of said motor with attendant heating of said motor and said assembly; and cooling means including a housing having a first portion including a tubular member surrounding said assembly and a tubular jacket constituting an auxiliary handgrip and surrounding said tubular member so as to define therewith a passage having a first and a second end provided with at least one first outlet to the atmosphere, said housing further having a second portion surrounding said motor and provided with at least one air-admitting inlet and at least one channel extending along said motor between said inlet and said passage, and a rotary fan driven by said motor and mounted in said housing between said channel and said passage adjacent said first end of the latter to draw at least one stream of atmospheric air through said inlet and said channel with attendant cooling of said motor and to force a first portion of said stream into said passage thereby such portion of said stream cools said assembly on its way into and through said first outlet, said housing further having at least one second outlet in the region of said fan for evacuation of the remaining portion of said air stream in response to rotation of said fan.
Claim 8
Dependent Claim
36 words
A combination as defined in claim 5, wherein said tubular member has a flange at said second end of said passage and said jacket is mounted between said flange and said second portion of said housing.
Claim 9
Dependent Claim
15 words
A combination as defined in claim 5, wherein said jacket consists of synthetic plastic material.
Claim 10
Dependent Claim
29 words
A combination as defined in claim 1, wherein said fan is rotatable about a predetermined axis and comprises a plurality of straight blades extending radially outwardly from said axis.
Claim 11
Dependent Claim
39 words
A combination as defined in claim 1, wherein said fan is rotatable in a predetermined direction about a predetermined axis and comprises a plurality of arcuate blades extending outwardly from said axis and rearwardly with reference to said direction.
Claim 12
Dependent Claim
14 words
A combination as defined in claim 1, wherein said motor is an alternating-direct-current motor.
Claim 13
Dependent Claim
14 words
A combination as defined in claim 1, wherein said motor is a polyphase-current motor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |