US3757462A - System for safely lowering an electric model plane - Google Patents

System for safely lowering an electric model plane Download PDF

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Publication number
US3757462A
US3757462A US00271647A US3757462DA US3757462A US 3757462 A US3757462 A US 3757462A US 00271647 A US00271647 A US 00271647A US 3757462D A US3757462D A US 3757462DA US 3757462 A US3757462 A US 3757462A
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US
United States
Prior art keywords
plane
tail
propeller shaft
propeller
spring
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 - Lifetime
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US00271647A
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English (en)
Inventor
K Mabuchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mabuchi Motor Co Ltd
Original Assignee
Mabuchi Motor Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mabuchi Motor Co Ltd filed Critical Mabuchi Motor Co Ltd
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Publication of US3757462A publication Critical patent/US3757462A/en
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    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63H—TOYS, e.g. TOPS, DOLLS, HOOPS OR BUILDING BLOCKS
    • A63H27/00—Toy aircraft; Other flying toys
    • A63H27/02—Model aircraft

Definitions

  • ABSTRACT A system for safely lowering an electric model plane of the free flight type which comprises a connecting means for connecting a propeller shaft with a tail assembly pivotally mounted on the tail portion of the plane and a spring means associated with said tail assembly. While the plane keeps flying, the connecting means is pulled forward by the propeller shaft due to a propelling movement against a spring force of said spring means thereby to hold the tail assembly in the normal horizontal flight position. When the propeller ceases to rotate through an exhaustion of a battery etc., the propeller is pushed back by a wind pressure accompanied by retraction of the connecting means thereby to urge the tail assembly to turn into an upwardly slanting position by the force of the spring means. Thus, the plane can go down in a vertical direction maintaining a substantially horizontal position thereof. Therefore,
  • the present system requires no setting mechanism nor remote control and can perform the operation automatically and securely.
  • This invention relates generally to an electric model plane, and more particularly to a system for lowering an electric model plane of the free flight type safely onto the ground when the motor is stopped during flight of the plane.
  • the primary object of the present invention is to provide a system for lowering an electric model plane of the free flight type, whereby the plane may be lowered safely onto the ground when the motor of the plane comes to a stop due to, for example, exhaustion of the battery while the plane is still travelling in the air.
  • Another object of the present invention is to provide a system for lowering an electric model plane of the type mentioned above safely onto the ground substantially in a vertical direction while maintaining the plane body in a horizontal posture.
  • Still another object of the present invention is to provide a system of the nature described above, whereby it is possible to enjoy a flight of the plane in a limited space and whereby the plane can be prevented from being lost in an ascending air current or bump.
  • a further object of the present invention is to provide a system for safely lowering an electric model plane of the type mentioned above, which does not require provision of any setting mechanism nor remote control and which is capable of performing the above mentioned operation automatically and securely.
  • a still further object of the present invention is to provide a system for safely lowering the plane of the type mentioned above, which is provided with a lock mechanism for rendering the lowering system inoperative when it is required to use the plane as a conventional electric plane without each system.
  • a system for safely lowering an electric model plane of the free flight type having a plane body including a tail assembly pivotally mounted on the tail of said plane body and consisting of a horizontal tail and a vertical tail formed integrally therewith, a battery mounted on said plane body, a motor mounted on said plane body and supplied with power from said battery, a propeller driven by said motor through a propeller shaft for propelling the plane; which comprises a connecting means for connecting said propeller shaft with said tail assembly; and a spring means associated with said tail assembly, said connecting means holding said horizontal tail in a normal horizontal position agent a spring action of said spring means while the propeller is rotated by said motor, said spring means shifting said horizontal tail of said plane into a slantingly raised position under the influence of said spring action when said motor comes to a stop due to exhaustion of said battery, thereby to prevent further flight of said plane and at the same time to lower the plane substantially in the vertical direction while maintaining the plane body in a horizontal posture.
  • FIG. I is a diagramatic side view showing in vertical section a system in an electric model plane embodying the present invention.
  • FIG. 2 is a view similar to FIG. I but showing the tail assembly in an actuated or raised position
  • FIG. 3 is a perspective view showing the connection between the propeller shaft and the connecting rod member
  • FIG. 4 is a side elevation showing the approximate direction in which the plane body is lowered
  • FIG. 5 is a fragmental perspective view of another embodiment of the present invention, showing on an enlarged scale the tail portion of the plane incorporating the system of the invention.
  • FIGS. 6 and 7 are side elevations on an enlarged scale of the second embodiment shown in FIG. 5.
  • FIGS. 1 to 3 showing the first embodiment of the invention, there is designated at a a plane body having a tail assembly consisting of horizontal tails a1 and a vertical tail 02.
  • These horizontal and vertical tails a1 and a2 are formed integrally with each other and are pivotally mounted on a tail assembly mounting plate a3 at the tail portion of the plane body a by means ofa hinge 1 for upward pivotting movement thereabout.
  • the horizontal tails have a support plate 2 attached securely to the underface close to the front edge thereof.
  • a battery for a motor 4 of the plane There is shown at 3 a battery for a motor 4 of the plane.
  • a pinion gear 5 is securely mounted on the output shaft of the motor 4.
  • This pinion gear 5 is engaged with a gear 6 securely mounted on the propeller shaft 7 which is movable back and forth along the axis thereof as will be explained in more detail hereinafter.
  • the propeller shaft supports at the front end thereof a propeller member 7a and at the rear end a connecting member 7b and stop and bearing members 7c.
  • a connecting rod member 8 is provided for connection said propeller shaft 7 and the horizontal and vertical tail assembly.
  • the connecting rod member 8 is provided with an angularly turned portion 8a and a looped portion 8b in the front end portion thereof.
  • the looped portion 8b is loosely fitted over the propeller shaft 7 at a position between said connecting member 7b and the stop and bearing members 7c.
  • the looped portion 8b is movable back and forth over and along the propeller shaft 7 without obstructing the rotational movement thereof.
  • the forward movement of the looped portion 8b of the connecting rod member 8 is limited by the connecting member 7b while the rearward or retracting movement is limited by the stop and bearing members 7c.
  • the aforementioned angularly turned portion 8a is positioned to pass over said stop and bearing members 7c.
  • the rear end portion of the connecting rod member 8 is connected to the rear lower portion of the supporting plate member 2 mentioned above.
  • Shown at 9 is a tension spring with one end thereof secured to the plane body a and the other end to the forward upper portion of the supporting plate member 2 to urge the tail assembly to turn around the hinge 1 into the actuated or raised position.
  • the battery 3 supplies power to the motor 4 for rotating the same.
  • the rotating movement of the motor 4 is transmitted to the propeller 7a via pinion gear 5 and the gear 6.
  • the propeller pushes air and a propelling movement is imparted to the plane body through the propeller shaft 7.
  • the propeller shaft 7 is movable back and forth and is normally rotated in the forward position with its front end spaced a short distance from the nose of the plane (see the distance between the nose of the plane body andthe boss of the propeller 7a).
  • FIGS. to 7 showing another embodiment of the invention, there is shown at a a plane body having horizontal tails a1 and a vertical tail :12 formed integrally therewith.
  • the horizontal tail plane al is pivotally mounted on a tail assembly mounting plate a3 by a hinge 1 provided on both sides of the vertical tail plane a2 for upward pivotting movement around the hinge l.
  • the support plate 10 is secured to the underface of the horizontal tail plane al centrally and adjacent to the front edge thereof and is provided with a connecting portion 10a and a bracket portion 10b.
  • the tail assembly mounting plate a3 has a bracket 11 securely attached to the lower-face thereof for fixedly receiving one leg 12b of a rod spring 12 the other leg 12a of which spring is secured to said bracket portion 10b of the support plate member 10.
  • a connecting rod member having a'front end thereof connected to the, propeller shaft 7 in the similar manner as in the embodiment shown in FIGS. 1 to 3 and its rear end connected to the connecting portion 100 of the support plate member 10. Therefore, while the propeller 7a is rotated, the horizontal tail plane a].
  • the plane may be provided with a lock means for preventing the upward rotation of the horizontal tail plane at, i.e., for enabling the plane to be used like a conventional model plane.
  • Such lock means may be of any construction and may be, for example, a screw or a hook adapted to fix the horizontal tail plane al to the plane body, or may be a means for retaining the connecting rod member 8 in the forward position.
  • the horizontal tail plane may be held in its normal horizontal position against action of a spring while the rotation of the propeller is maintained by the motor, and the horizontal tail plane is actuated into a raised position for preventing further flight of the plane and at the same time for lowering the plane substantially in a vertical direction keeping the plane body in a horizontal posture.
  • the plane may be provided with a lock mechanism for rendering the lowering system inoperative when so desired to use the plane in the same manner as a conventional electric plane without such lowering system.
  • a system for safely lowering an electric model plane of the free flight type having a plane body including a tail assembly pivotally mounted on the tail of said plane body and comprising a horizontal tail and a vertical tail formed integrally therewith, a battery mounted on said plane body, a motor mounted on said plane body and supplied with power from said battery, and a propeller driven by said motor through a propeller shaft for propelling the plane; said system comprising a connecting means for connecting said propeller shaft with said tail assembly; and a spring means associated with said tail assembly, said connecting means holding said horizontal tail in a normal horizontal position against a spring action of said spring means while the propeller is rotated by said motor, said spring means shifting said horizontal tail of said plane into a slantingly raised position under the influence of said spring action when said motor comes to a stop due to exhaustion of said battery, thereby to prevent further flight of said plane and at the same time to lower the plane substantially in the vertical direction while maintaining the plane body in a horizontal posture.
  • a system as defined in claim I which includes a plate member secured to the lower surface of said horizontal tail plane in the forward center portion thereof, a connecting rod member movable back and forth and having the front end thereof connected to a propeller shaft and the rear end to split plate member in the rear lower portion thereof, wherein said spring means includes a spring member having one end thereof connected to the plane body and the other end secured to said plate member in the forward upper potion thereof for urging said horizontal tail plane into said raised position when said connecting rod member is moved backwardly.
  • connecting rod member is provided at the digital front end thereof with a looped portion loosely fitted over the propeller shaft at a position between a connecting member and stop and bearing members mounted on said propeller shaft and with an angularly turned portion disposed to stride over said stop and bearing members.
  • a system as defined in claim 1 which includes a plate member having a connecting portion and a bracket portion secured to the lower surface of said portion of said support plate member for urging said horizontal tail plane into said raised position when said connecting rod member is moved backwardly 5.

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  • Toys (AREA)
US00271647A 1971-07-14 1972-07-14 System for safely lowering an electric model plane Expired - Lifetime US3757462A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5231271 1971-07-14

Publications (1)

Publication Number Publication Date
US3757462A true US3757462A (en) 1973-09-11

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ID=12911250

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Application Number Title Priority Date Filing Date
US00271647A Expired - Lifetime US3757462A (en) 1971-07-14 1972-07-14 System for safely lowering an electric model plane

Country Status (7)

Country Link
US (1) US3757462A (it)
AU (1) AU469977B2 (it)
CA (1) CA942500A (it)
DE (1) DE2234796A1 (it)
FR (1) FR2146080A5 (it)
GB (1) GB1344210A (it)
IT (1) IT962779B (it)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4181830A (en) * 1976-04-29 1980-01-01 Hermann Neuhierl Flight control system for free flight model aeroplanes
US20080242186A1 (en) * 2006-05-03 2008-10-02 Nicholas Amireh Toy aircraft with modular power systems and wheels
US20110130066A1 (en) * 2006-05-03 2011-06-02 Mattel, Inc. Toy aircraft with modular power systems and wheels
USD724675S1 (en) * 2012-03-22 2015-03-17 Shai Goitein Power unit attachable to a folded paper airplane
USD725715S1 (en) * 2014-01-28 2015-03-31 Shai Goitein Power unit attachable to a folded paper airplane
USD755900S1 (en) 2014-10-01 2016-05-10 Shai Goitein Power unit attachable to a folded paper airplane
USD756466S1 (en) 2015-10-12 2016-05-17 Shai Goitein Power unit attachable to a folded paper airplane
USD757859S1 (en) 2014-10-01 2016-05-31 Shai Goitein Power unit attachable to a folded paper airplane
US9375650B1 (en) 2012-03-22 2016-06-28 Shai Goitein Electric power airplane conversion kit
CN106178530A (zh) * 2015-04-29 2016-12-07 张斌 自由飞航空模型

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113371177B (zh) * 2021-06-08 2024-12-24 河北新天科创新能源技术有限公司 一种新型叶片和尾翼角度转动装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2805349A (en) * 1955-10-19 1957-09-03 Elliott A Friedman Model airplane control device
US3699708A (en) * 1970-12-02 1972-10-24 Mabuchi Motor Co Electric-powered model airplane

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2805349A (en) * 1955-10-19 1957-09-03 Elliott A Friedman Model airplane control device
US3699708A (en) * 1970-12-02 1972-10-24 Mabuchi Motor Co Electric-powered model airplane

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4181830A (en) * 1976-04-29 1980-01-01 Hermann Neuhierl Flight control system for free flight model aeroplanes
US20080242186A1 (en) * 2006-05-03 2008-10-02 Nicholas Amireh Toy aircraft with modular power systems and wheels
US7918707B2 (en) 2006-05-03 2011-04-05 Mattel, Inc. Toy aircraft with modular power systems and wheels
US20110130066A1 (en) * 2006-05-03 2011-06-02 Mattel, Inc. Toy aircraft with modular power systems and wheels
USD724675S1 (en) * 2012-03-22 2015-03-17 Shai Goitein Power unit attachable to a folded paper airplane
US9375650B1 (en) 2012-03-22 2016-06-28 Shai Goitein Electric power airplane conversion kit
US9682329B1 (en) 2012-03-22 2017-06-20 Shai Goitein Electric power paper airplane conversion kit/unit
USD725715S1 (en) * 2014-01-28 2015-03-31 Shai Goitein Power unit attachable to a folded paper airplane
USD755900S1 (en) 2014-10-01 2016-05-10 Shai Goitein Power unit attachable to a folded paper airplane
USD757859S1 (en) 2014-10-01 2016-05-31 Shai Goitein Power unit attachable to a folded paper airplane
CN106178530A (zh) * 2015-04-29 2016-12-07 张斌 自由飞航空模型
USD756466S1 (en) 2015-10-12 2016-05-17 Shai Goitein Power unit attachable to a folded paper airplane

Also Published As

Publication number Publication date
AU469977B2 (en) 1976-02-26
IT962779B (it) 1973-12-31
FR2146080A5 (it) 1973-02-23
GB1344210A (en) 1974-01-16
DE2234796A1 (de) 1973-01-25
AU4441072A (en) 1974-01-17
CA942500A (en) 1974-02-26

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