초록 ▼

A door closer includes a housing having one or more bulges, a shaft rotatably received in the housing and having an axle, and one or more resilient rings engaged between the shaft and the housing. The bulges of the housing may be engaged with the resilient rings for preventing the shaft from moving

A door closer includes a housing having one or more bulges, a shaft rotatably received in the housing and having an axle, and one or more resilient rings engaged between the shaft and the housing. The bulges of the housing may be engaged with the resilient rings for preventing the shaft from moving axially relative to the housing. An adjustable spring biasing device may apply a spring biasing force between the housing and the shaft for recovering the shaft relative to the housing. One or more spring biased projections may limit the movement between the shaft and the housing.

대표청구항 ▼

1. A door closer comprising: a housing including a chamber formed therein, and including at least one bulge extended into said chamber of said housing,a shaft rotatably received in said chamber of said housing, and including an axle extended outwardly through said housing, and including an outer per

1. A door closer comprising: a housing including a chamber formed therein, and including at least one bulge extended into said chamber of said housing,a shaft rotatably received in said chamber of said housing, and including an axle extended outwardly through said housing, and including an outer peripheral portion,at least one resilient ring engaged between said outer peripheral portion of said shaft and said housing,said at least one bulge of said housing being engaged with said at least one resilient ring for rotatably retaining said at least one resilient ring between said housing and said shaft, and for preventing said shaft from moving axially relative to said housing, anda biasing means engaged between said shaft and said housing for applying a spring biasing force between said housing and said shaft.2. The door closer according to claim 1, wherein said at least one bulge of said housing includes a depression formed therein and defined by at least one cusp, for receiving said at least one resilient ring, said at least one cusp is engageable with said at least one resilient ring for preventing said at least one resilient ring from moving axially relative to said shaft and said housing.3. The door closer according to claim 1, wherein said shaft includes at least one recess formed in said outer peripheral portion thereof for receiving said at least one resilient ring and for preventing said at least one resilient ring from moving axially relative to said shaft and said housing.4. The door closer according to claim 3, wherein said shaft includes at least one cut-off space formed therein and communicating with said at least one recess thereof, for receiving said at least one bulge, and for facilitating an engaging of said shaft and said at least one resilient ring into said housing.5. The door closer according to claim 1, wherein said biasing means includes a casing rotatably received in said chamber of said housing, and at least one spring secured between said shaft and said casing.6. The door closer according to claim 5 further comprising means for adjusting the spring biasing force of said at least one spring between said shaft and said casing.7. The door closer according to claim 5, wherein said housing includes an oblong hole formed therein, said casing includes a first aperture formed therein, and a pin engaged in said first aperture of said casing and received in said oblong hole of said housing and engageable with said housing for positioning said casing to said housing.8. The door closer according to claim 7, wherein said casing includes at least one second aperture formed therein for selectively receiving said pin and for adjusting the spring biasing force of said at least one spring between said shaft and said casing.9. The door closer according to claim 1, wherein said shaft includes a spindle extended outwardly through said housing, and extended opposite to said axle.