Storefront fenestration systems

Patent metadata

Field	Value
Publication number	US-2026098439-A1
Application number	US-202519323588-A
Country	US
Kind code	A1
Filing date	Sep 9, 2025
Priority date	Oct 8, 2024
Publication date	Apr 9, 2026
Grant date	—

Abstract

A fenestration system includes a back angle anchor providing a first anchor portion and a second anchor portion extending from the first anchor portion and providing an attachment receptor, the back angle anchor being securable to an underlying substrate at the first anchor portion, a subsill providing a first subsill portion and a second subsill portion extending from the first subsill portion, and an anchor hook extending from the second subsill portion and defining a subsill cavity sized to receive the attachment receptor. The subsill is attached to the back angle anchor using one or more mechanical fasteners penetrating the anchor hook and received within the attachment receptor, and the mechanical fasteners do not penetrate the first or second subsill portions.

First claim

1 . A fenestration system, comprising:
a back angle anchor providing a first anchor portion and a second anchor portion extending from the first anchor portion and providing an attachment receptor, the back angle anchor being securable to an underlying substrate at the first anchor portion; a subsill providing a first subsill portion and a second subsill portion extending from the first subsill portion; and an anchor hook extending from the second subsill portion and defining a subsill cavity sized to receive the attachment receptor, wherein the subsill is attached to the back angle anchor using one or more mechanical fasteners penetrating the anchor hook and received within the attachment receptor, and wherein the subsill is anchorable to the substrate via the back angle anchor without penetrating the first or second subsill portions.

2 . The fenestration system of claim 1 , further comprising a building membrane arrangeable between the subsill and the substrate and including a membrane section interposing the second anchor portion and the second subsill portion,
wherein the subsill is anchorable to the substrate via the back angle anchor without penetrating the building membrane.

3 . The fenestration system of claim 2 , wherein the substrate comprises a first substrate portion made of a first material and a second substrate portion made of a second material different from the first material, the fenestration system further comprising a layer of insulation laterally interposing the first and second substrate portions,
wherein the membrane section comprises a first membrane section, and the building membrane further includes a second membrane section interposing the first substrate portion and the layer of insulation.

4 . The fenestration system of claim 3 , wherein the subsill is arranged to extend across portions of each of the first and second substrate portions.

5 . The fenestration system of claim 1 , wherein the anchor hook comprises a first extension extending from the second subsill portion and a second extension extending from the first extension.

6 . The fenestration system of claim 5 , wherein the second extension defines a vertical slot sized to receive the one or more mechanical fasteners, the vertical slot allowing a height of the subsill to be adjusted relative to the back angle anchor prior to securing the one or more mechanical fasteners.

7 . The fenestration system of claim 1 , further comprising a stool trim operatively coupleable to the anchor hook and the back angle anchor and thereby hiding attachment between the anchor hook and the attachment receptor.

8 . The fenestration system of claim 7 , wherein the stool trim includes:
a stool base; and a stool leg extending from the stool base and operatively coupleable to an anchor leg extending from the first anchor portion with one or more additional mechanical fasteners.

9 . The fenestration system of claim 8 , wherein the stool leg defines a vertical slot sized to receive the one or more additional mechanical fasteners, the vertical slot allowing a height of the subsill to be adjusted relative to the back angle anchor prior to securing the one or more additional mechanical fasteners.

10 . The fenestration system of claim 1 , further comprising brake metal flashing arrangeable on an exterior of the system and including an end operatively coupleable to the first subsill portion.

11 . The fenestration system of claim 1 , further comprising a fenestration operatively couplable to the subsill and receivable within a space cooperatively defined by the first and second subsill portions.

12 . The fenestration system of claim 1 , wherein the attachment receptor comprises an elongate channel extending a longitudinal length of the subsill.

13 . The fenestration system of claim 1 , wherein the subsill comprises a composite profile such that the first portion includes:
a first section; a second section; and a thermal break that operatively couples the first and second sections.

14 . A method of assembling a fenestration system, comprising:
securing a back angle anchor to an underlying substrate, the back angle anchor providing a first anchor portion secured to the substrate and a second anchor portion extending from the first anchor portion and providing an attachment receptor; arranging a subsill atop the substrate, the subsill providing:
a first subsill portion;
a second subsill portion extending from the first subsill portion; and
an anchor hook extending from the second subsill portion and defining a subsill cavity;
receiving the attachment receptor into the subsill cavity as the subsill is arranged atop the substrate; and attaching the subsill to the back angle anchor using one or more mechanical fasteners penetrating the anchor hook and received within the attachment receptor, wherein the subsill is anchored to the substrate via the back angle anchor without penetrating the first or second subsill portions.

15 . The method of claim 14 , further comprising:
arranging a building membrane between the subsill and the substrate; and arranging a membrane section of the building membrane between the second anchor portion and the second subsill portion, wherein the subsill is anchored to the substrate via the back angle anchor without penetrating the building membrane.

16 . The method of claim 14 , wherein the anchor hook comprises a first extension extending from the second subsill portion and a second extension extending from the first extension, and wherein the second extension defines a vertical slot sized to receive the one or more mechanical fasteners, the method further comprising:
adjusting a height of the subsill relative to the back angle anchor; and securing the one or more mechanical fasteners to the attachment receptor via the vertical slot once the height is adjusted.

17 . The method of claim 14 , further comprising coupling a stool trim to the anchor hook and the back angle anchor and thereby hiding attachment between the anchor hook and the attachment receptor.

18 . The method of claim 17 , wherein the stool trim includes a stool base, and a stool leg extending from the stool base and defining a vertical slot, and wherein coupling the stool trim to the anchor hook and the back angle anchor comprises:
adjusting a height of the subsill relative to the back angle anchor; and securing one or more additional mechanical fasteners to an anchor leg extending from the first anchor portion via the vertical slot and once the height is adjusted.

19 . The method of claim 14 , further comprising securing brake metal flashing to the first subsill portion on an exterior of the system.

20 . The method of claim 14 , further comprising:
receiving a fenestration within a space cooperatively defined by the first and second subsill portions; and
operatively coupling the fenestration to the subsill.

Assignees

• Arconic Tech Llc

Inventors

• Mckenna Gregory B
• Hartwell Christopher R

Classifications

• E06B7/14

  Measures for draining-off condensed water or water leaking-in {frame members for draining off condensation water, throats at the bottom of a sash} · CPC title

• E06B1/702

  Window sills · CPC title

• E06B1/6038

  specially adapted for being embedded in the wall · CPC title

• E04B2/721

  connections specially adapted therefor · CPC title

• E04B2/88

  Curtain walls {(fixing of glass panes E06B3/54)} · CPC title