fairphone-case: prop recesses in lid

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/fairphone-case.scad b/fairphone-case.scad
index 394da7934f808115516cf714cd61c024d268b5f6..1ee38859e5a94edb04b1831ff6f4544d61705446 100644 (file)
--- a/fairphone-case.scad
+++ b/fairphone-case.scad
@@ -4,6 +4,8 @@ include <utils.scad>
 
 phone = [ 75.0, 145.0 ];
 
+prop_lid_posns = [ 58, 140 ]; // measured from bottom of phone
+
 bumper = [ 0.250, -0.025 ];
 // ^ One side.  Overall size is increased by twice this.
 // If no bumpers, is the gap around the phone.
@@ -108,6 +110,17 @@ catch_height = 0.35;
 catch_finger_height = 1.5;
 catch_finger_depth = 2.5;
 
+prop_main_width = 3;
+prop_main_th = 3;
+prop_wing_len = 3;
+prop_nose_slope = 1.5; // bigger means pointier
+prop_side_gap = 0.75; // each side
+prop_fin_height = 1.5;
+prop_fin_width = 0.75;
+prop_max_angle = 45; // bigger means at worse angle
+prop_recess_under = 0.30;
+prop_backfwd_gap = 1.0; // total
+
 // ---------- calculated ----------
 
 phone_width =  (phone + bumper*2)[0];
@@ -124,6 +137,11 @@ lid_buttoncover_overlap = case_th_lip + keeper_gap_z_top;
 
 phone_backside_slope_thick = phone_total_thick - phone_edge_thick;
 
+prop_nose_len = case_th_lid - prop_recess_under;
+prop_recess_slope = tan(prop_max_angle); // bigger means steeper
+prop_recess_depth = case_th_lid - prop_recess_under;
+prop_recess_width = prop_main_th / cos(prop_max_angle) + prop_backfwd_gap;
+
 //lid_lip_overlap_width xxx bad name = ;
 //lid_lip_inner_slope = [ 5, 5 ]; // xxx
 
@@ -221,6 +239,14 @@ cppQ = [ cppR[0],
         cppV[1] - (catch_finger_height - cp_rQ) ];
 cppF = [ cppV[0] + catch_finger_depth, cppC[1] ];
 
+// prop recess
+
+prp1 = [0,0]; // by definition
+prp2 = prp1 + [ -prop_recess_slope, -1 ] * prop_recess_depth;
+prp4 = prp1 + [1,0] * prop_recess_width;
+prp3 = [ prp4[0], prp2[1] ];
+prp5 = prp4 + [1,0] * prop_recess_depth;
+
 // ---------- modules ----------
 
 module KeeperProfile(slant=0){
@@ -556,6 +582,27 @@ module CatchPortion(width){
     children(0);
 }
 
+module PropRecess(){
+  // origin and orientation are nonstandard
+  hwd345 = 0.5*prop_main_width + prop_side_gap;
+  hwd35  = 0.5*prop_fin_width + prop_side_gap;
+  linextr(-hwd345, +hwd345)
+    polygon([ prp1,
+             prp2,
+             prp3,
+             prp4,
+             prp4 + [0,10],
+             prp1 + [0,10],
+             ]);
+  linextr(-hwd35, +hwd35)
+    polygon([ prp1,
+             prp3,
+             prp5,
+             prp5 + [0,10],
+             prp1 + [0,10],
+             ]);
+}
+
 module CaseBase(){
   AroundEdges(epp3[1], case_th_bottom, 1)
     EdgeProfile();
@@ -683,6 +730,13 @@ module Lid(){ ////toplevel
 
     // screw holes in the hinge arms
     HingeScrews();
+
+    // prop recesses
+    Flip_bot(1)
+      for (y = prop_lid_posns)
+       translate([ phone_width/2, -y, lpp13[1] ])
+         rotate([90,0,90])
+         PropRecess();
   }
 }
 
@@ -937,3 +991,4 @@ module DemoProfiles(){ ////toplevel
 //LidEdgeProfile();
 //KeeperProfile();
 //DemoProfiles();
+//PropRecess();