Brushing – scrubbing – and general cleaning – Attachments – Optical-member-attachable cleaner
Reexamination Certificate
2000-03-28
2003-04-29
Graham, Gary K. (Department: 1744)
Brushing, scrubbing, and general cleaning
Attachments
Optical-member-attachable cleaner
C310S091000, C074S60600R, C015S250300
Reexamination Certificate
active
06553606
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a motor device having a motor and a rotation speed reduction mechanism for driving a wind shield wiper with a construction that the motor device is easily fixed to a wiper frame.
2. Description of Related Art
In a conventional motor device having a gear housing in which a reduction mechanism for reducing a rotation speed of a motor is housed, the gear housing is generally made through forming processing such as aluminum die-casting or resin molding. As it is necessary to form a shaft hole by which an output shaft of the reduction mechanism is held so as to penetrate through the gear housing, the gear housing is formed preferably in a manner that dies to be used for the forming processing may be parted in an axial direction of the output shaft thereof.
On the other hand, as shown in
FIG. 9
, the gear housing
100
is provided with installation legs
104
for fixing the motor device. The installation legs
104
are fixed to a flat surface portion
102
A of a frame
102
having a one side open square shaped cross section. Each of the installation legs
104
is provided with a through hole
108
into which a bolt
106
is inserted on fixing to the frame
102
. The through hole
108
is formed to extend in a direction same as the direction in which the dies are parted in view of easily splitting out the dies after forming. When the gear housing
100
is fixed to the flat surface portion
102
A of the frame
102
by the bolt
106
and a nut
110
, it is preferable, as shown in
FIG. 10
, that the flat surface portion
102
A is faced in parallel with the output shaft of the reduction mechanism in consideration of a strength of the frame
120
for supporting the wiper device.
In the case that the gear housing
100
is fixed to the flat surface portion
102
A faced in parallel with the output shaft of the reduction mechanism, the gear housing
100
may be provided, as shown in JP-U-5-40063, separately with a bracket made by press forming a plate in a given shape. However, this causes a problem that more manufacturing time and component parts are required, resulting in more manufacturing cost.
Further, to solve the above problem, if the gear housing
100
is provided integrally with installation legs
114
having through holes
112
extending perpendicularly to the output shaft of the gear housing
100
, as shown in
FIG. 10
, the through holes
112
may not be formed in the gear housing
100
simply by upper and lower dies. In this case, a moving core in the dies becomes necessary for forming the through holes
112
so that the construction of the dies becomes complicated.
Further, as a process for fixing the gear housing
100
to the frame
102
, at first, while the nut
110
is held in one hand, the bolt
106
have to be inserted into the through hole
112
and be tentatively screwed into the nut
110
. Then, the bolt
106
is rigidly fastened with the nut
110
by a fastening tool. As a result, not only the fastening process becomes troublesome but also the nut
110
is likely to fall down during the fixing work.
SUMMARY OF THE INVENTION
The present invention has been made in view of the above mentioned problem, and an object of the present invention is to provide a motor device having a reduction mechanism in which an installation leg with a through hole formed nearly perpendicularly to an axis of an output shaft of the reduction mechanism is integrally formed with a gear housing without using a special moving core. As a result, while the manufacturing cost becomes less, a work for fixing the gear housing to a frame becomes easier.
To achieve the above object, the motor device is comprised of a motor, a reduction mechanism having an output shaft and a housing with an installation portion for housing the reduction mechanism so as to have the output shaft penetrate therethrough. The housing is formed integrally with the installation portion by a pair of dies parting in an axial direction of the output shaft.
The installation portion is composed of a side surface coming in surface contact with a seat surface of the frame, a first recess portion for holding a nut whose entire inner surface is opened at least on one side of the housing in the axial direction of the output shaft and a second recess portion for inserting a bolt whose entire inner surface is opened on the other side of the housing in the axial direction of the output shaft and which extends from the side surface to the first recess portion nearly perpendicularly to the axial direction of the output shaft.
According to the construction mentioned above, since the inner surfaces of the first and second recess portions are opened in a parting direction of the dies, respectively, for example, since the first recess portion may be formed by an upper die and the second recess portion may be formed by a lower dies, a through hole extending nearly perpendicularly to the parting direction of the dies may be formed as the second recess portion between the first recess portion and the frame. Therefore, the housing may be fixed to the frame by inserting the bolt through a penetrating hole of the frame into the second recess portion and screwing the bolt into the nut housed in the first recess portion.
As mentioned above, even if the second recess portion constituting the through hole is shaped nearly perpendicular to the axial direction of the output shaft, the through hole may be formed merely by the upper and lower dies without using a moving core. As a result, the housing may be easily manufactured at lower cost.
Preferably, the inner surface has a nut holding surface opened only on the one side of the housing in an opposing direction to a gravity so that, just by dropping the nut into the first recess portion, the nut may be housed in the first recess portion with its own weight. This makes the fastening work easier.
Further, it is preferable that the inner surface of the first recess portion has a retaining surface coming in contact with an outer surface of the nut and preventing the nut from rotating together with the bolt when the bolt is screwed into the nut. This construction serves to fix easily the housing to the frame without holding the nut in one hand.
Furthermore, preferably, the first recess portion is provided at the inner surface on a side opposite to the second recess portion with a concave portion at which a leading end of the bolt is housed when the bolt is fastened to penetrate through the nut. With the concave portion, the bolt may be further screwed into the nut even after the leading end of the bolt penetrates through the nut. As a result, the motor device may be reliably fixed to the frame irreverent to a length of the bolt.
REFERENCES:
patent: 5222706 (1993-06-01), Hoshino
patent: 5261286 (1993-11-01), Hayashi
patent: 5441227 (1995-08-01), Hayashi
patent: 2551811 (1985-03-01), None
patent: 2761318 (1998-10-01), None
patent: 2767102 (1999-02-01), None
patent: 2325617 (1998-12-01), None
patent: 63-104314 (1990-03-01), None
patent: U-5-40063 (1993-05-01), None
patent: A-9-191595 (1997-07-01), None
patent: 2000-38117 (2000-02-01), None
Kanazawa Keisuke
Yamamoto Naohito
Asmo Co. Ltd.
Graham Gary K.
Posz & Bethards, PLC
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