You didn't state how long the bars are so stick the chair above the table while the table is by the bars. You also didn't state how high up you are so it would be a safe landing. The guard is outside so he can't hear you moving the chair and table. Problem solved.

You didn't state how long the bars are so stick the chair above the table while the table is by the bars. You also didn't state how high up you are so it would be a safe landing. The guard is outside so he can't hear you moving the chair and table. Problem solved.