Electricity: motive power systems – With particular motor-driven load device – Power- or motion-transmitting mechanism
Reexamination Certificate
2000-03-30
2001-11-20
Ro, Bentsu (Department: 2837)
Electricity: motive power systems
With particular motor-driven load device
Power- or motion-transmitting mechanism
C049S502000
Reexamination Certificate
active
06320335
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATION
This application is related to and claims priority from Japanese Patent Application No. Hei. 11-267032 filed on Sep. 21, 1999, the contents of which are hereby incorporated by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a reciprocating drive device for reciprocating a drive member by transmitting a rotating force from a motor to a regulator having a driven gear meshing with a drive gear fixed outside a housing of the motor. More particularly, the present invention relates to a relative-movement preventing unit of the reciprocating drive device for preventing a relative movement between the housing and a support base for supporting the driven gear.
2. Description of Related Art
A power window device shown in
FIGS. 9A-10
is one type of a reciprocating drive device. The power window device includes a motor
1
and an X-arm type regulator
2
. The regulator
2
includes a support base
3
fixed to a vehicle door, a lift arm
5
pivotally supported on the support base
3
by a support shaft
17
, a sector gear
4
integrally joined to the lift arm
5
, an equalizer arm
6
pivotally linked to the lift arm
5
, an equalizer bracket
7
for guiding a movement of a lower end of the equalizer arm
6
, and a lift arm bracket
8
for guiding movements of an upper end of the equalizer arm
6
and an upper end of the lift arm
5
.
FIG. 10
shows an internal construction of an output part
10
of the motor
1
. A worm
11
fixed to an output shaft (not shown) of a motor body portion
9
of the motor
1
meshes with a worm wheel
15
fixed to an output shaft
14
in a space enclosed by a housing
12
and a cover
13
of the output part
10
. Rotating force from the motor body portion
9
is transmitted to the sector gear
4
through the worm
11
, the worm wheel
15
, the output shaft
14
and a driving gear
16
fixed to the output shaft
14
, and the sector gear
4
turns around the support shaft
17
. When the sector gear
4
turns around the support shaft
17
, the lift arm bracket
8
moves up or down and a window glass (not shown) mounted on the lift arm bracket
8
moves up or down.
The housing
12
is fixed to the support base
3
by a number of screws
18
. In a lock state where the window glass has reached the top of a window frame when the window is fully closed or where the regulator has reached a lower limit when the window is fully open, the housing
12
tries to move with respect to the support base
3
in a direction perpendicular to the output shaft
14
. To prevent a relative movement between the motor
1
and the support base
3
, it is necessary for the housing
12
to be fixed to the support base
3
strongly. To this end, in this related art device, metal inserts
19
are embedded in the housing
12
which is made of relatively soft synthetic resin, and the screws
18
are screwed into these metal inserts
19
.
However, the metal inserts
19
are expensive, and furthermore a troublesome insert-molding process for embedding the metal inserts
19
into the housing
12
is necessary.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a reciprocating drive device having a relative-movement preventing unit which prevents a relative movement between a motor housing and a support base without using metal inserts.
According to the present invention, a reciprocating drive device for reciprocating a drive member includes a motor having a drive gear disposed outside a motor housing to be rotatable integrally with an output shaft, a regulator having a driven gear mashing with the drive gear, a support base for supporting the driven gear and for fixing the housing, a screw-fixing unit through which the housing is directly screwed to the support base, and a relative-movement preventing unit provided by an engagement between the support base and the housing for preventing a relative movement between the support base and the housing. Thus, even when the housing made of resin and the support base made of metal are directed screwed by screws of the screw-fixing unit, a relative movement between the housing and the support base is prevented by the relative-movement preventing unit without using metal inserts.
Preferably, the relative-movement preventing unit includes a mating projection provided on one of the housing and the support base, and a mating concavity provided on the other of the housing and the support base. Further, the mating projection is fitted into the mating concavity when the housing is fixed to the support base by the screw-fixing unit. Thus, the relative movement between the housing and the support base is further prevented.
REFERENCES:
patent: 4742726 (1988-05-01), Adam et al.
patent: 4967510 (1990-11-01), Torii et al.
patent: 5111715 (1992-05-01), Farris
patent: 5794480 (1998-08-01), Schonsteiner
patent: 6075298 (2000-06-01), Maue et al.
patent: 2462179 (1976-06-01), None
Asmo Co. Ltd.
Law Offices of David G. Posz
Ro Bentsu
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