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  DamperUSPTO Application #: 20070241314Title: Damper Abstract: A damper has a body, a spindle and multiple beads. The body has a base with a through hole, a top cap with a through hole and a cavity defined in the body. The spindle is mounted inside the body and has a spindle body and a transverse post formed on the spindle body. The multiple beads are received inside the cavity in the body and abut the transverse post. The damper provides a friction by the transverse post abutting and moving over the beads, therefore, when the damper is mounted on a retractable device, the retracting rate of the retractable device may be adjusted conveniently by changing the amount of the beads. (end of abstract)
Agent: Patenttm.us - Portland, OR, US Inventor: Robert Tsai USPTO Applicaton #: 20070241314 - Class: 256024000 (USPTO) Related Patent Categories: Fences, Panel The Patent Description & Claims data below is from USPTO Patent Application 20070241314. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a damper, and more particularly to a damper adapted for a retractable device. [0003] 2. Description of Related Art [0004] Many devices have retractable devices mounted inside, the devices, such as electric wire retractor, retractable tape, window curtains or seat belt of the car, provide a retractable force for pulling a string or a belt back. The retractable device has a spiral spring mounted inside, when a foreign force pulls the spiral spring out, the spiral spring will return back automatically when the force is released. [0005] The spiral spring provides a retractable force for the string or the belt, and has the following advantages. First, the spiral spring provides a constant resilience. Second, the distance for retracting the spiral spring is short. Therefore, the volume of the spiral spring is small, and such spring is very convenient for use. [0006] However, the coefficient of elasticity k value of the spiral spring relates to the rate for retracting a string or a belt, i.e. the coefficient of elasticity k value of the spiral spring relates to the retractable force of the spiral spring and whether the spiral spring retracts smoothly. When the coefficient of elasticity k value is small, the retractable force is small so that a string or a belt may not be retracted completely. When the k value is large, the force for retracting a string or a belt will be large and a string or a belt may wind around or make somebody get hurt caused by a fast retracting movement. [0007] To overcome the shortcomings, the present invention tends to provide a damper to mitigate the aforementioned problems. SUMMARY OF THE INVENTION [0008] The primary objective of the present invention is to provide a damper that is applied to a retractable device and improves the safety of using the retractable device. [0009] The damper has a body, a spindle and multiple beads. The body has a base with a through hole, a top cap with a through hole and a cavity defined in the body. The spindle is mounted inside the body and has a spindle body and a transverse post formed on the spindle body. The multiple beads are received inside the cavity in the body and abut the transverse post. [0010] The damper provides a friction by the transverse post abutting and moving over the beads, therefore, when the damper is mounted on a retractable device, the retracting rate of the retractable device may be adjusted conveniently by changing the amount of the beads. [0011] Other objects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS [0012] FIG. 1 is an exploded perspective view of a first embodiment of a damper in accordance with the present invention; [0013] FIG. 2 is a side view in partial section of the damper in FIG. 1; [0014] FIG. 3 is a side view in partial section of a retractable railing device with the damper in FIG. 1; [0015] FIG. 4 is a perspective view of the retractable railing device with the damper in accordance with the present invention; [0016] FIG. 5 is a perspective view of a retractable tape with the damper in accordance with the present invention; [0017] FIG. 6 is a perspective view of an electric appliance with the damper in accordance with the present invention; and [0018] FIG. 7 is a side view in partial section of a retractable railing device with a second embodiment of a damper in accordance with the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT [0019] With reference to FIGS. 1 and 2, a first embodiment of a damper (A) in accordance with the present invention has a body (10), a spindle (20) and multiple beads (30). [0020] The body (10) has a base (11), a top cap (12) and a cavity (13). The base (11) has a through hole (111) defined therein. The top cap (12) is mounted on the base (11) and has a through hole (121) corresponding to the through hole (111) in the base (11). The cavity (13) is defined between the base (11) and the top cap (12). Continue reading... Full patent description for Damper Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Damper patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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