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A mount bracket includes a fixing frame, an installation unit, a movable member, a positioning member and a release member. The fixing frame includes a side wall and an end wall. The movable member has a first board movably connected to the side wall and a second board. The first board includes an e

A mount bracket includes a fixing frame, an installation unit, a movable member, a positioning member and a release member. The fixing frame includes a side wall and an end wall. The movable member has a first board movably connected to the side wall and a second board. The first board includes an engaging hole and a contact portion. The positioning member is fixed to the side wall and has an engaging portion. The movable member is movably connected to the first board. When in assembling, the contact portion and the second board contact the inside and outside of a post of a rack. The fixing frame is pushed toward the post to insert the installation unit into the holes of the post. The engaging portion of the positioning member is engaged with the engaging hole of the movable member to connect the movable member to the fixing frame.

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1. A mount bracket connected to a slide assembly and installed to a post of a rack, the post having a plurality of holes, the mount bracket comprising: a fixing frame having a side wall, an end wall, and two protrusions respectively extending from a top side and a bottom side of the side wall, the t

1. A mount bracket connected to a slide assembly and installed to a post of a rack, the post having a plurality of holes, the mount bracket comprising: a fixing frame having a side wall, an end wall, and two protrusions respectively extending from a top side and a bottom side of the side wall, the two protrusions and the side wall defining a first path, the side wall having a recess and defining a second path;an installation unit fixed to the end wall of the fixing frame;a movable member having a first board and a second board, the first board inserted into the first path of the fixing frame, the first board having a contact portion and a support frame, the support frame inserted into the second path of the fixing frame and the contact portion located adjacent to the second board, the support frame having an engaging hole, the second board having a plurality of holes located corresponding to the installation unit;a positioning member having a fixing portion, a resilient arm, an activation portion, and an engaging portion, the fixing portion fixed to the side wall of the fixing frame, the resilient arm connected between the fixing portion and the activation portion, the activation portion extending at an angle to project from an end of the resilient arm away from the side wall, the engaging portion projecting from the resilient arm toward the side wall to selectively engage the engaging hole of the movable member;a release member movably connected to the first board of the movable member and having a push block located to selectively contact the activation portion of the positioning member;wherein the contact portion of the movable member and the second board respectively are located on the inside and outside of the post of the rack when assembled thereto, the installation unit being located corresponding to the holes of the post for insert into the holes of the post, the engaging portion of the positioning member being engaged with the engaging hole of the movable member to connect the movable member to the fixing frame, andwherein the push block of the release member contacts the activation portion of the positioning member when the release member is actuated, the resilient arm of the positioning member being thereby lifted relative to the movable member, the engaging portion of the positioning member being responsively disengaged from the engaging hole of the movable member to free the movable member for movement relative to the fixing frame, whereby the installation unit of the mount bracket is able to be removed from the post. 2. The mount bracket as claimed in claim 1, wherein the side wall of the fixing frame has two connection holes, the first board of the movable member has two through holes located corresponding to the connection holes of the side wall, the through holes are respectively cooperated with the connection holes, the through holes or the connection holes are in the form of elongated slots, two connection members extend through the through holes and the connection holes to movably connect the movable member to the fixing frame. 3. The mount bracket as claimed in claim 1, wherein the side wall of the fixing frame has a stop which extends within a window of the side wall, the stop is located corresponding to the release member. 4. The mount bracket as claimed in claim 1, wherein the installation unit has two installation members and a positioning block located between the two installation members, the positioning block has a threaded hole defined therethrough and the threaded hole is located corresponding to the end wall of the fixing frame. 5. The mount bracket as claimed in claim 1, wherein the release member has an operation portion, and a connection portion extending between the push block and the operation portion, the push block has an inclined face located corresponding to the activation portion of the positioning member. 6. The mount bracket as claimed in claim 1, wherein the push block of the release member has a neck connected to a connection portion and the first board has a slot through which the neck extends so that the release member is movably connected to the support frame of the movable member. 7. The mount bracket as claimed in claim 6, wherein the side wall of the fixing frame has a stop which is located corresponding to the push block or the neck such that the release member does not separate from the movable member. 8. A mount bracket, comprising: a fixing frame having a side wall, an end wall extending perpendicularly from an end of the side wall, and two protrusions respectively extending from a top side and a bottom side of the side wall, the two protrusions and the side wall defining a first path, the side wall having two connection holes, a recess, and a stop, the recess being located between the connection holes, the recess extending to the end wall and defining a second path, a window defined through the side wall and communicating with the recess;an installation unit fixed to the end wall of the fixing frame and comprising two installation members;a movable member having a first board, and a second board extending at an angle from the first board, the first board inserted into the first path of the fixing frame, the first board having two through holes, a contact portion, and a slot, each of the through holes located corresponding to each of the connection holes, two connection members respectively extending through the through holes and the connection holes to movably connect the movable member to the fixing frame, the contact portion located adjacent to the second board, a support frame inserted into the second path of the fixing frame and the support frame having an engaging hole, the second board having a plurality of holes located corresponding to the installation members of the installation unit;a positioning member having a fixing portion, a resilient arm, an activation portion, and an engaging portion, the fixing portion fixed to the side wall of the fixing frame, the resilient arm connected between the fixing portion and the activation portion, the activation portion extending at an angle to project from an end of the resilient arm away from the side wall, the engaging portion projecting from the resilient arm toward the side wall to selectively engage the engaging hole of the movable member, the engaging portion extending through the window of the fixing frame when engaging the engaging hole, anda release member having a push block, an operation portion, and a connection portion between the push block and the operation portion, the push block having an inclined face located to selectively contact the activation portion of the positioning member, the release member being movably connected to the support frame of the movable member. 9. The mount bracket as claimed in claim 8, wherein the push block of the release member has a neck connected to the connection portion and the neck extends through the slot of the movable member so that the release member is movably connected to the support frame of the movable member. 10. The mount bracket as claimed in claim 9, wherein the stop of the side wall of the fixing frame is located corresponding to the push block or the neck such that the release member does not separate from the movable member.