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Ratcheting strap clip

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Dejvino 2021-01-18 19:03:27 +01:00
parent 61dbc1e75a
commit f1c4576519
1 changed files with 145 additions and 3 deletions
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148
strap_link.scad
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@ -1,5 +1,13 @@
links_count=6;
include_terminal=true;
links_count=6; // [1..20]
include_terminal=true; // [true,false]
export=4; // [0:5]
MODEL_DEMO=0;
MODEL_LINKS=1;
MODEL_CLIP=2;
MODEL_CLIP_RATCHETING=3;
MODEL_CLIP_RATCHETING_A=4;
MODEL_CLIP_RATCHETING_B=5;
//validation=1;
VALIDATE_INTERSECTION=1;
@ -10,6 +18,11 @@ use <BOSL/transforms.scad>
use <BOSL/shapes.scad>
include <BOSL/constants.scad>
function is_not_export() = is_undef(export) || export == 0;
function is_export() = !is_not_export();
function is_model_strict(m) = is_export() && export == m;
function is_model(m) = is_not_export() || export == m;
function get_link_segment_size() = [15, 30, 5];
function get_link_pin_diameter() = 2;
function get_link_socket_slack() = [1, 4, 1];
@ -18,6 +31,8 @@ function get_link_socket_size() = [get_link_segment_size().z,
get_link_segment_size().y - get_link_joiner_arm_size().y*2,
get_link_segment_size().z];
function get_link_clip_size() = [get_link_pin_diameter()*5, get_link_segment_size().y - 5, get_link_segment_size().z];
echo("===============================");
echo(str("Strap length: ", (links_count * get_link_segment_size().x), " mm"));
echo("===============================");
@ -101,6 +116,127 @@ module link(terminal=false) {
}
}
module clip() {
socket_size=get_link_socket_size();
clip_size=get_link_clip_size();
pin_diam=get_link_pin_diameter();
slot_slack=get_link_socket_slack();
size=[clip_size.x+socket_size.x, clip_size.y, clip_size.z];
slot_size=[clip_size.x+slot_slack.x, size.y+1, pin_diam+slot_slack.z];
entry_size=[slot_size.x-5, clip_size.y+1, clip_size.z];
right(clip_size.x/2)
difference() {
cuboid(size, fillet=1);
cuboid(slot_size, fillet=1);
up(entry_size.z/2) cube(entry_size, center=true);
}
}
module clip_ratcheting(ratchet_length=20) {
socket_size=get_link_socket_size();
clip_size=get_link_clip_size();
pin_diam=get_link_pin_diameter();
slot_slack=get_link_socket_slack();
size=[clip_size.x+socket_size.x, clip_size.y, clip_size.z];
slot_size=[clip_size.x+slot_slack.x, size.y+1, pin_diam+slot_slack.z];
entry_size=[slot_size.x-5, clip_size.y+1, clip_size.z];
//right(clip_size.x/2)
module hook() {
intersection() {
difference() {
cuboid(size, fillet=1);
cuboid(slot_size, fillet=1);
up(entry_size.z/2) cube(entry_size, center=true);
}
translate([0, -50, -50]) cube([100, 100, 100]);
}
}
module hookRight() {
hook();
}
module hookLeft() {
scale([-1, 1, 1]) hook();
}
wall=2;
tooth_size=[2, 2, 3];
module tooth() {
s=[tooth_size.x, tooth_size.z, tooth_size.y];
up(tooth_size.z/2) xrot(-90) right_triangle(s);
}
module teethFwd() {
tooth_count = ratchet_length/tooth_size.x;
fwd((clip_size.y-wall*2)/2)
right(ratchet_length/2) {
for (i=[1:tooth_count]) {
left(i*tooth_size.x) tooth();
}
cap_size=[ratchet_length, tooth_size.y, 1];
up(tooth_size.z/2 + cap_size.z/2) left(cap_size.x/2) back(tooth_size.y/2) {
difference() {
cube(cap_size, center=true);
translate([0.1, 0.1, 0]) back(tooth_size.y/2) right(ratchet_length/2) zrot(180) tooth();
}
}
}
}
module teethBack() {
scale([1, -1, 1]) teethFwd();
}
module ratchetLeft() {
right(ratchet_length/2) {
difference() {
cube([ratchet_length, clip_size.y, clip_size.z], center=true);
up(wall/2) cube([ratchet_length, clip_size.y-wall*2, clip_size.z], center=true);
}
teethFwd();
teethBack();
}
}
ratchet_tooth_count=3;
ratchet_wall=1;
module ratchetTeethFront() {
module ratchetButton() {
size=[3,wall*4,2];
up(4) fwd(wall*2 - ratchet_wall) cuboid(size, fillet=1, edges=EDGES_FRONT);
up(2) back(wall/2) cube([size.x, wall, tooth_size.z + size.z], center=true);
}
fwd((clip_size.y-wall*2)/2 - tooth_size.y - 0.5)
left(ratchet_length) {
for (i=[0:ratchet_tooth_count-1]) {
right(i*tooth_size.x) scale([-1,-1,1]) tooth();
}
ratchetButton();
}
module ratchetWall() {
up(tooth_size.z/2) left(ratchet_length/2 + wall - wall/2) fwd(clip_size.y/2-wall-tooth_size.y-ratchet_wall)
down(wall/2+0.5) cube([ratchet_length + wall, ratchet_wall, tooth_size.z], center=true);
}
ratchetWall();
}
module ratchetTeethBack() {
scale([1,-1,1]) ratchetTeethFront();
}
module ratchetRight() {
left(wall/2) cube([wall, clip_size.y, clip_size.z], center=true);
ratchetTeethFront();
ratchetTeethBack();
}
if (is_model(MODEL_CLIP_RATCHETING_A) || is_model(MODEL_CLIP_RATCHETING)) {
left(ratchet_length + wall + 1) {
hookLeft();
left(0.5) ratchetLeft();
}
}
if (is_model(MODEL_CLIP_RATCHETING_B) || is_model(MODEL_CLIP_RATCHETING)) {
ratchetRight();
hookRight();
}
}
// Export / Demo / Validation:
segment_size=get_link_segment_size();
if (!is_undef(validation)) {
if (validation==VALIDATE_INTERSECTION) {
@ -121,7 +257,13 @@ if (!is_undef(validation)) {
}
}
} else {
for (i = [0:links_count-1]) {
if (is_model(MODEL_CLIP)) {
left(get_link_clip_size().x) clip();
}
if (is_model(MODEL_CLIP_RATCHETING) || is_model(MODEL_CLIP_RATCHETING_A) || is_model(MODEL_CLIP_RATCHETING_B)) {
left(get_link_clip_size().x) clip_ratcheting();
}
if (is_model(MODEL_LINKS)) for (i = [0:links_count-1]) {
terminal=(i==links_count-1) && include_terminal;
right(i*segment_size.x) link(terminal=terminal);
}