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  Damper for damping vibration and washing machine having the sameRelated Patent Categories: Brakes, Internal-resistance Motion Retarder, Valve Structure Or LocationDamper for damping vibration and washing machine having the same description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060011429, Damper for damping vibration and washing machine having the same. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] This application claims the benefit of Korean Patent Application Nos. 10-2004-0054423, 10-2004-0054424, 10-2004-0054425 and 10-2004-0054426, filed on Jul. 13, 2004, which are hereby incorporated by references as if fully set forth herein. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a damper for damping vibration, and more particularly, to a damper, the damping force of which is adjustable, and a washing machine having the same. [0004] 2. Discussion of the Related Art [0005] Generally, a washing machine performs washing, rinsing, and dehydrating operations by filling the lower portion of the inside of a tub with water and detergent, placing laundry in a drum installed in the tub, and rotating the drum. [0006] Such a washing machine is an apparatus for eliminating dirt from laundry using proper detergent and mechanical force. [0007] Accordingly, the washing machine usually comprises a cabinet forming an external appearance, an outer tub provided in the cabinet for containing washing water, and an inner tub rotatably provided in the outer tub for containing laundry. [0008] Particularly, a washing machine in which a rotary shaft of the inner tub is approximately horizontal with the ground is referred to as a drum washing machine. [0009] With reference to FIG. 1, the drum washing machine is an apparatus for eliminating dirt from laundry by rotating a drum using the driving force of a motor under the condition that detergent, washing water and laundry are placed in the drum installed horizontally with the bottom of a cabinet. The drum washing machine minimizes entanglement of the laundry and damage to the laundry, consumes a small quantity of the washing water, and has laundry-beating and rubbing effects. [0010] More specifically, the drum washing machine comprises the cabinet 10 forming an external appearance, a tub 20 provided in the cabinet 10, and the drum 30 rotatably provided in the tub 20. [0011] Here, an opening for placing the laundry in the cabinet 10 is formed through the front surface of the cabinet 10, and a door 11 for opening and closing the opening is installed at the opening. [0012] A rotating device 40, such as a motor, for rotating the drum 30 is installed in the rear of the tub 20. [0013] The tub 20 is horizontally installed in the cabinet 10 by suspension springs 50 for connecting the ceiling of the cabinet 10 and the upper part of the tub 20, and a damper 60 for connecting the bottom of the cabinet 10 and the lower part of the tub 20 is installed on the lower part of the cabinet 10. [0014] The damper 60 is a unit for damping the vibration of the tub 20 generated due to the rotation of the drum 30. The damper 60 usually comprises a damper cylinder having a cylindrical shape, a shaft inserted into the damper cylinder and reciprocating, and a friction member fixed to the shaft. [0015] Here, the friction member reduces the vibration of the tub 20 by means of the friction with the damper cylinder. [0016] The above drum washing machine sequentially or selectively performs washing, rinsing, and dehydrating operations, thereby washing the laundry. [0017] When the dehydrating operation of the drum washing machine is started, the drum 30 is rotated at a high speed by the rotating device 40, thus dehydrating the laundry. [0018] In an initial stage of the dehydrating operation, i.e., in the initial driving of the rotating device 40 and the drum 30, the tub 20 is excessively vibrated (hereinafter, referred to as "excessively vibrated state"). [0019] As the spin speeds of the rotating device 40 and the drum 30 are gradually increased, the vibration of the tub 20 is gradually decreased. [0020] Thereafter, when the rotating device 40 and the drum 30 reach normal spin speeds, the vibration of the tub 20 is greatly decreased compared to the initial stage of the dehydrating operation, and is stabilized to reach a normally vibrated state. [0021] The shaft of the damper 60 reciprocates in the lengthwise direction of the damper cylinder in the damper cylinder by means of the vibration of the tub 20, and the friction member reciprocates together with the reciprocation of the shaft and rubs against the inner wall of the damper cylinder. [0022] The vibration of the tub 20 is damped by the frictional force between the friction member and the damper cylinder. [0023] Hereinafter, the relation between the number of vibration of the tub and the spin speed of the drum and the relation between the vibration-transmitting force (hereinafter, referred to as TR force) of the damper and the spin speed of the drum according to variation of the damping force of the damper will be described with reference to FIGS. 2 and 3. Continue reading about Damper for damping vibration and washing machine having the same... Full patent description for Damper for damping vibration and washing machine having the same Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Damper for damping vibration and washing machine having the same 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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