Ratcheting strap clip
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parent
61dbc1e75a
commit
f1c4576519
148
strap_link.scad
148
strap_link.scad
@ -1,5 +1,13 @@
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links_count=6;
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include_terminal=true;
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links_count=6; // [1..20]
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include_terminal=true; // [true,false]
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export=4; // [0:5]
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MODEL_DEMO=0;
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MODEL_LINKS=1;
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MODEL_CLIP=2;
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MODEL_CLIP_RATCHETING=3;
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MODEL_CLIP_RATCHETING_A=4;
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MODEL_CLIP_RATCHETING_B=5;
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//validation=1;
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VALIDATE_INTERSECTION=1;
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@ -10,6 +18,11 @@ use <BOSL/transforms.scad>
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use <BOSL/shapes.scad>
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include <BOSL/constants.scad>
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function is_not_export() = is_undef(export) || export == 0;
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function is_export() = !is_not_export();
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function is_model_strict(m) = is_export() && export == m;
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function is_model(m) = is_not_export() || export == m;
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function get_link_segment_size() = [15, 30, 5];
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function get_link_pin_diameter() = 2;
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function get_link_socket_slack() = [1, 4, 1];
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@ -18,6 +31,8 @@ function get_link_socket_size() = [get_link_segment_size().z,
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get_link_segment_size().y - get_link_joiner_arm_size().y*2,
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get_link_segment_size().z];
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function get_link_clip_size() = [get_link_pin_diameter()*5, get_link_segment_size().y - 5, get_link_segment_size().z];
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echo("===============================");
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echo(str("Strap length: ", (links_count * get_link_segment_size().x), " mm"));
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echo("===============================");
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@ -101,6 +116,127 @@ module link(terminal=false) {
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}
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}
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module clip() {
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socket_size=get_link_socket_size();
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clip_size=get_link_clip_size();
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pin_diam=get_link_pin_diameter();
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slot_slack=get_link_socket_slack();
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size=[clip_size.x+socket_size.x, clip_size.y, clip_size.z];
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slot_size=[clip_size.x+slot_slack.x, size.y+1, pin_diam+slot_slack.z];
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entry_size=[slot_size.x-5, clip_size.y+1, clip_size.z];
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right(clip_size.x/2)
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difference() {
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cuboid(size, fillet=1);
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cuboid(slot_size, fillet=1);
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up(entry_size.z/2) cube(entry_size, center=true);
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}
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}
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module clip_ratcheting(ratchet_length=20) {
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socket_size=get_link_socket_size();
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clip_size=get_link_clip_size();
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pin_diam=get_link_pin_diameter();
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slot_slack=get_link_socket_slack();
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size=[clip_size.x+socket_size.x, clip_size.y, clip_size.z];
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slot_size=[clip_size.x+slot_slack.x, size.y+1, pin_diam+slot_slack.z];
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entry_size=[slot_size.x-5, clip_size.y+1, clip_size.z];
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//right(clip_size.x/2)
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module hook() {
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intersection() {
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difference() {
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cuboid(size, fillet=1);
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cuboid(slot_size, fillet=1);
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up(entry_size.z/2) cube(entry_size, center=true);
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}
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translate([0, -50, -50]) cube([100, 100, 100]);
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}
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}
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module hookRight() {
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hook();
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}
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module hookLeft() {
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scale([-1, 1, 1]) hook();
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}
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wall=2;
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tooth_size=[2, 2, 3];
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module tooth() {
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s=[tooth_size.x, tooth_size.z, tooth_size.y];
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up(tooth_size.z/2) xrot(-90) right_triangle(s);
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}
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module teethFwd() {
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tooth_count = ratchet_length/tooth_size.x;
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fwd((clip_size.y-wall*2)/2)
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right(ratchet_length/2) {
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for (i=[1:tooth_count]) {
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left(i*tooth_size.x) tooth();
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}
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cap_size=[ratchet_length, tooth_size.y, 1];
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up(tooth_size.z/2 + cap_size.z/2) left(cap_size.x/2) back(tooth_size.y/2) {
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difference() {
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cube(cap_size, center=true);
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translate([0.1, 0.1, 0]) back(tooth_size.y/2) right(ratchet_length/2) zrot(180) tooth();
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}
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}
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}
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}
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module teethBack() {
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scale([1, -1, 1]) teethFwd();
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}
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module ratchetLeft() {
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right(ratchet_length/2) {
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difference() {
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cube([ratchet_length, clip_size.y, clip_size.z], center=true);
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up(wall/2) cube([ratchet_length, clip_size.y-wall*2, clip_size.z], center=true);
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}
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teethFwd();
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teethBack();
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}
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}
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ratchet_tooth_count=3;
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ratchet_wall=1;
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module ratchetTeethFront() {
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module ratchetButton() {
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size=[3,wall*4,2];
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up(4) fwd(wall*2 - ratchet_wall) cuboid(size, fillet=1, edges=EDGES_FRONT);
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up(2) back(wall/2) cube([size.x, wall, tooth_size.z + size.z], center=true);
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}
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fwd((clip_size.y-wall*2)/2 - tooth_size.y - 0.5)
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left(ratchet_length) {
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for (i=[0:ratchet_tooth_count-1]) {
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right(i*tooth_size.x) scale([-1,-1,1]) tooth();
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}
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ratchetButton();
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}
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module ratchetWall() {
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up(tooth_size.z/2) left(ratchet_length/2 + wall - wall/2) fwd(clip_size.y/2-wall-tooth_size.y-ratchet_wall)
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down(wall/2+0.5) cube([ratchet_length + wall, ratchet_wall, tooth_size.z], center=true);
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}
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ratchetWall();
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}
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module ratchetTeethBack() {
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scale([1,-1,1]) ratchetTeethFront();
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}
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module ratchetRight() {
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left(wall/2) cube([wall, clip_size.y, clip_size.z], center=true);
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ratchetTeethFront();
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ratchetTeethBack();
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}
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if (is_model(MODEL_CLIP_RATCHETING_A) || is_model(MODEL_CLIP_RATCHETING)) {
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left(ratchet_length + wall + 1) {
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hookLeft();
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left(0.5) ratchetLeft();
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}
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}
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if (is_model(MODEL_CLIP_RATCHETING_B) || is_model(MODEL_CLIP_RATCHETING)) {
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ratchetRight();
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hookRight();
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}
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}
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// Export / Demo / Validation:
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segment_size=get_link_segment_size();
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if (!is_undef(validation)) {
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if (validation==VALIDATE_INTERSECTION) {
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@ -121,7 +257,13 @@ if (!is_undef(validation)) {
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}
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}
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} else {
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for (i = [0:links_count-1]) {
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if (is_model(MODEL_CLIP)) {
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left(get_link_clip_size().x) clip();
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}
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if (is_model(MODEL_CLIP_RATCHETING) || is_model(MODEL_CLIP_RATCHETING_A) || is_model(MODEL_CLIP_RATCHETING_B)) {
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left(get_link_clip_size().x) clip_ratcheting();
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}
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if (is_model(MODEL_LINKS)) for (i = [0:links_count-1]) {
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terminal=(i==links_count-1) && include_terminal;
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right(i*segment_size.x) link(terminal=terminal);
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}
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