US20040227442A1

US20040227442A1 - Structure for sliding rail of drawers

Info

Publication number: US20040227442A1
Application number: US10/437,248
Authority: US
Inventors: Kuo-sheng Huang
Original assignee: Nan Juen International Co Ltd
Current assignee: Nan Juen International Co Ltd
Priority date: 2003-05-14
Filing date: 2003-05-14
Publication date: 2004-11-18

Abstract

A structure improvement for sliding rail of drawers with longer life cycle and extendable length, mainly containing an outer sliding rail, an inner sliding rail, and a steelball-sliding sheet placed between the outer sliding rail and the inner sliding rail to guide the inner sliding rail to move freely. A rolling bearing is installed on the embedding end of the sliding rail, inside the inner groove of the outer sliding rail, so as to guide the movement inner sliding rail. With the rolling bearing against the top and the bottom retaining sheets of the inner groove, the steelball-sliding sheet and the rolling bearing provides multi-point support to resists against the moment of force. Shortening the steelball-sliding sheet's length increases extendable length of the inner sliding rail to the extend of full expansion, thus enhance the life cycle and the extendable length of the drawers.

Description

FIELD OF THE INVENTION

The present invention relates to a structure sliding rail of drawers, especially the one with longer life cycle and extendable length.

BACKGROUND OF THE INVENTION

As shown in FIG. 1 and FIG. 2. Traditional sliding rail of drawers containers an outer sliding

rail

1′, an inner sliding rail 2′ and a steelball-sliding sheet 3′. The inner rail 2′ is placed in the inner groove 11′ of the outer sliding rail 1′ while the steelball-sliding sheet 3′ is placed between the outer sliding rail 1 and the inner sliding rail 2′, guiding the movement of the inner sliding rail 2′, thus makes it move freely inside the inner groove 11′ of the outer sliding rail 1′.

However, when the inner sliding

rail

2′ extends, the sheetball-sliding sheet 3′ placed between the outer sliding rail 1′ and the inner sliding rail 2′ would move along with the inner sliding rail 2′ and stop at the front end of the outer sliding rail 1′. The length L of the steelball-sliding sheet 3′ is limited with certain mechanism that resists the moment of force at the intersection of the fully-expanded inner sliding rail 2′ and the outer sliding rail 1′. Otherwise, the steelball-sliding sheet 3′ failing to resist the moment of force would cause distortion of the two retaining sheets 12′ on the inner groove 11′ of the outer sliding rail 1′, even cause the two retaining sheets 12′ to stretch outward, thus make the inner rail 2′ and the steelball-sliding sheet 3′ fall off.

Furthermore, the length L of the steelball-sliding

sheet

3′ is restricted by the length expansion criterion and the section area of the outer sliding rail 1′ and the inner sliding rail 2′; therefore the length expansion of the steelball-sliding sheet 3′ and the inner sliding rail 2′ is limited and prevents the inner sliding rail 2′ from fully extending.

Moreover, the extension and movement of the inner sliding

rail

2′ depend on the guiding of the steelball-sliding sheet 3′ and the moment of force at the intersection of the inner sliding rail 2′ and the outer sliding rail 1′. The repeated pulling and gliding for a long time would cause the steelball sliding sheet 3′ to wear down faster than the outer sliding rail 1′ and the inner sliding rail 2′, and influences the life cycle of the sliding rail of drawers.

SUMMARY OF THE INVENTION

In view of such demerits, the inventor of the present invention was devoted to finding a solution and accomplished structure for sliding rail of drawers with longer life cycle and extendable length.

The main objective for the present invention is to install a rolling bearing on the embedding end of the sliding rail. The rolling bearing placed inside the inner groove of the outer sliding rail guides the movement inner sliding rail inserted to the outer sliding rail. In this way, when the inner sliding rail extends and moves, the steelball-sliding sheet can guide the rail with the assistance of the rolling bearing so as to provide multi-point support for the extension and movement of the inner sliding rail. Moreover, by placing the rolling bearing on the embedding end of the outer sliding rail, a length of the fully-expanding inner sliding rail's end remains at the embedding end of the outer sliding rail, and the rolling bearing leans against the top and the bottom retaining sheets of the inner groove; therefore the resistance against the moment of force at the intersection of the inner sliding rail and the outer sliding rail is strengthened and give the rolling bearing and steelball-sliding sheets the ability of restricting multi-point supports. The moment of force imposed on the steelball-sliding sheets is reduced and thus enlarge its life cycle, which in turn extend the life cycle of the sliding rails of drawers.

Another objective for the present invention is to provide a structure that assists the guiding of the steelball-sliding sheets and the resistance against the moment of force. This mechanism shortens the length of the steelball-sliding sheet, increasing the extendable length of the inner sliding rail to the extend of full expansion. Consequently, the area of the drawer being opened is larger than it used to be and enhances usability.

In the following, the embodiment illustrated is used to describe the detailed structural characteristics and operation action for the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an illustration for the structural appearance of traditional sliding rails of drawers. [0010]
FIG. 2 is a lateral illustration for formation of the traditional sliding rails of drawers. [0011]
FIG. 3 is an illustration for the structural appearance of the present invention. [0012]
FIG. 4 is a three-dimensional illustration for formation of the sliding rails of drawers for the present invention. [0013]
FIG. 5 is a lateral illustration for formation of the sliding rails of drawers for the present invention. [0014]
FIG. 6 is an illustration about the present invention applied to three-phase sliding rails of drawers.[0015]

DETAILED DESCRIPTION OF THE INVENTION

Please refer to FIG. 3. The sliding rail of drawers for the present invention containers an outer sliding [0016] rail 1, an inner sliding rail 2 and a steelball-sliding sheet 3. The inner rail 2 is placed in the inner groove 11 of the outer sliding rail 1 while the steelball-sliding sheet 3 is placed between the outer sliding rail 1 and the inner sliding rail 2, guiding the movement of the inner sliding rail 2, thus makes it move freely. inside the inner groove II of the outer sliding rail 1.
A rolling bearing [0017] 13 placed is installed at the embedding end 13 of the outer sliding rail 1. The rolling bearing 13 placed inside the inner groove of the outer sliding rail 1 helps guide the movement inner sliding rail 2 inserted to the outer sliding rail. The edge 131 of the rolling bearing 13 leans against the top retaining sheet 211 and the bottom retaining sheet 212 on the inner groove 21 of the inner sliding rail 2 to act as guide assistance (refer to FIG. 4 and FIG. 5).
In this way, when the inner sliding [0018] rail 2 extends and moves, the steelball-sliding sheet 3 can guide the rail with the assistance of the rolling bearing 13 so that the extension and movement of the inner sliding rail supports multi-point movement. Moreover, by placing the rolling bearing 13 on the embedding end 12 of the outer sliding rail, a length of the fully-expanding inner sliding rail 2 remains at the embedding end 12 of the outer sliding rail 1; therefore the resistance against the moment of force at the intersection of the inner sliding rail 2 and the outer sliding rail 1 is strengthened and the moment of force is restricted by multi-point supports formed by the rolling bearing 13 and steelball-sliding sheets 3, enhancing the life cycle of the drawer.
Compared the existing drawers with the same length of steelball-sliding [0019] sheet 3, the present invention's rolling bearing at the embedding end 12 of the outer sliding rail 1, even being pulled and dragged repeatedly, has a life cycle 4 times greater than existing drawers.
Moreover, the rolling bearing [0020] 13 at the embedding end 12 of the outer sliding rail 1 assists the guiding of the steelball-sliding sheet 3 as well as resists the moment of force, shortening the length of the steelball-sliding sheet 3, thus increases the extendable length of the inner sliding rail 2 to the extend of full expansion. Consequently, the area of the drawer being opened is larger than it used to be and enhances usability.
The above present invention describes two-phase drawers with longer life cycle and extendable length. A three-phase drawer is illustrated as FIG. 6, wherein the outer sliding [0021] rail 1 is used as a middle sliding rail, with is an extending outer sliding rail covered upon its inner groove 11. A steelball-sliding sheet 5 is covered on the outer sliding rail 1 and the extending outer sliding rail 4 to guide the movement of the outer sliding rail 1, allowing the inner groove 41 of the extending outer sliding rail 4 to move freely, thus enlarge the drawer's life cycle and extendable length.
To summarize the above description, the sliding rail in the present invention can provide effective performance and extend its life through a simple structure, which practically meets the qualifications for invention based on new type and improvement. Accordingly, an application is submitted for examination. [0022]

Claims

What is claimed is:

1. A structure for sliding rail of drawers, containing an outer sliding rail, an inner sliding rail and a steelball-sliding sheet with said steelball-sliding sheet placed between said outer sliding rail and said inner sliding rail guiding said inner sliding rail to move freely, characterized in that:

a rolling bearing is installed at an embedding end of said outer sliding rail and inside an inner groove of said outer sliding rail, so as to guide movement of said inner sliding rail; an edge of said rolling bearing leans against a top and a bottom retaining sheets on an inner groove of said inner sliding rail;

said steelball-sliding sheet and said rolling bearing help guiding movement of said inner sliding rail and said rolling bearing enhances resistance against moment of force at one end of said inner sliding rail while forming multi-point support; by shortening length of said steelball-sliding sheet, drawers' life cycle and extendable length are both enhanced.