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An attachable work tray assembly includes a work tray, having a bottom and a wall encircling the bottom, a swingable arm pivotally connected to a side of the work tray and a fastening set for holding the swingable arm and the work tray in position. The swingable arm has a pivot end and an attaching

An attachable work tray assembly includes a work tray, having a bottom and a wall encircling the bottom, a swingable arm pivotally connected to a side of the work tray and a fastening set for holding the swingable arm and the work tray in position. The swingable arm has a pivot end and an attaching end. The pivot end has a plurality of positioning portions, and the attaching end is provided with a magnet. The fastening set has a fastening member and a knob. The fastening member has one end thereof provided with a buckle that is configured to selectively engage with one of the positioning portions of the corresponding swingable arm. By rotating the knob, the fastening member is forced to move toward the wall of the work tray.

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1. An attachable work tray assembly, comprising: a work tray, having a bottom and a wall encircling the bottom, the wall is formed with through holes;a swingable arm, having a pivot end and an attaching end, the pivot end having a plurality of positioning portions, the attaching end having a magnet,

1. An attachable work tray assembly, comprising: a work tray, having a bottom and a wall encircling the bottom, the wall is formed with through holes;a swingable arm, having a pivot end and an attaching end, the pivot end having a plurality of positioning portions, the attaching end having a magnet, and the swingable arm being such pivotally connected to one side of the work tray at the pivot end thereof such that the swingable arm is rotatable with respect to the work tray; and a fastening set, being assembled to the side of the work tray and comprising:a fastening member, having one end provided with a buckle that is configured to selectively engage with one of the positioning portions of the swingable arm;a bolt, having one end fixed to wall of the work tray, and an opposite end passing through the fastening member; anda knob, being screwed to the end of the bolt, so that by rotating the knob, the fastening member is forced to move toward the wall of the work tray and the buckle is made engage with a corresponding one of said corresponding positioning portions. 2. The attachable work tray assembly of claim 1, wherein the positioning portions are distributed peripherally on the pivot end and center a rotational axis of the swingable arm. 3. The attachable work tray assembly of claim 1, wherein the fastening set comprises a spring that is mounted around the bolt and props between the fastening member and the work tray. 4. The attachable work tray assembly of claim 1, wherein the fastening member has an opposite end provided with a prop that is configured to pass through one of said through holes formed on the work tray. 5. The attachable work tray assembly of claim 3, wherein the fastening member has a receiving portion, and the spring props between the receiving portion of the fastening member and the wall of the work tray, so that the receiving portion prevents the spring from transverse displacement. 6. The attachable work tray assembly of claim 1, wherein the work tray has a second side, and the attachable work tray assembly further comprise: another through hole formed at the wall and these two through hole are placed in opposite sides of the attachable work tray;a second swingable arm, having a pivot end and an attaching end, the pivot end having a plurality of positioning portions, the attaching end having a magnet, and the swingable arm being such pivotally connected to the second side of the work tray at the pivot end thereof such that the swingable arm is rotatable with respect to the work tray; anda second fastening set, being assembled to the second side of the work tray and comprising: a second fastening member, having one end provided with a second buckle that is configured to selectively engage with one of the positioning portions of the swingable arm connected to the second side of the work tray;a second bolt, having one end fixed to the wall of the work tray, and an opposite end passing through the fastening member that is configured to engage with the swingable arm connected to the second side of the work tray; anda second knob, being screwed to the end of the bolt passing through the through hole fastening member at the second side of the work tray, so that by rotating the knob, the fastening member is forced to move toward the wall of the work tray and the second buckle is made engage with one said corresponding positioning portion. 7. The attachable work tray assembly of claim 6, wherein the positioning portions are distributed peripherally on the pivot end and center a rotational axis of the swingable arm. 8. The attachable work tray assembly of claim 6, wherein the second fastening set comprises a second spring that is mounted around the bolt and props between the fastening member and the wall of the work tray. 9. The attachable work tray assembly of claim 6, wherein the second fastening member has an opposite end provided with a second prop that is configured to pass through a through hole formed on the work tray. 10. The attachable work tray assembly of claim 8, wherein the second fastening member has a second receiving portion, and the second spring props between the receiving portion of the fastening member and the wall of the work tray, so that the receiving portion prevents the spring from transverse displacement.