Anti-friction latchbolt

Patent metadata

Field	Value
Publication number	US-10196843-B2
Application number	US-201314433161-A
Country	US
Kind code	B2
Filing date	Oct 4, 2013
Priority date	Oct 5, 2012
Publication date	Feb 5, 2019
Grant date	Feb 5, 2019

Abstract

A latchbolt assembly includes a solid latchbolt having at least a first surface, a second surface and a third surface and an anti-friction bolt pivotally coupled to the solid latchbolt. The anti-friction bolt includes a cross member disposed adjacent the first surface of the solid latchbolt and a pair of plates depending from the cross member to form a U-shaped cross section. The plates are disposed adjacent the second and third surfaces of the solid latchbolt.

First claim

The invention claimed is:

1. A latchbolt assembly comprising:
a solid latchbolt having at least a first exterior surface, a second exterior surface opposite the first exterior surface and non-intersecting with the first exterior surface, and a third exterior surface located between the first exterior surface and the second exterior surface; and
an anti-friction bolt carried by and pivotally coupled to the solid latchbolt, the anti-friction bolt including a first side member overlapping a portion of the first exterior surface of the solid latchbolt, a second side member overlapping a portion of the second exterior surface of the solid latchbolt, and a cross member extending from the first side member towards the second side member, the cross member overlapping at least a portion of the third exterior surface of the solid latchbolt, the anti-friction bolt configured to assist in retraction of the solid latchbolt wherein when the anti-friction bolt pivots relative to the solid latchbolt in a first direction, the cross-member engages and forces the solid latchbolt to at least partially retract along a length of the latchbolt assembly.

2. A latchbolt assembly comprising:
a rod;
a solid latchbolt coupled to the rod, the solid latchbolt having a strike engaging portion; and
an anti-friction bolt having a U-shaped cross section having a portion positioned adjacent the strike engaging portion of the solid latchbolt, the anti-friction bolt being pivotally coupled to the solid latchbolt and configured to assist in retraction of the solid latchbolt, wherein when the anti-friction bolt pivots relative to the solid latchbolt in a first direction, the portion positioned adjacent the strike engaging portion of the solid latchbolt engages and forces the solid latchbolt to at least partially retract along a length of the rod.

3. The latchbolt assembly of claim 2 wherein the portion of the anti-friction bolt positioned adjacent the strike engaging portion of the solid latchbolt includes a cross member disposed across the solid latchbolt, the cross member being configured to engage the solid latchbolt.

4. The latchbolt assembly of claim 2 , wherein the anti-friction bolt is pivotably coupled to the solid latchbolt and the solid latchbolt is fixedly coupled to the rod.

5. The latchbolt assembly of claim 2 , wherein the anti-friction bolt is pivotably coupled to the solid latchbolt and is carried by the solid latchbolt.

6. The latchbolt assembly of claim 2 , wherein the rod and the solid latchbolt axially retract together.

7. The latchbolt assembly of claim 1 , wherein the solid latchbolt includes a curved camming surface and the cross member is configured to cooperate with the curved camming surface to assist retraction of the latchbolt into a mortise box.

8. The latchbolt assembly of claim 1 , wherein the anti-friction bolt is directly pivotably coupled to the solid latchbolt.

9. A latchbolt assembly comprising:
a rod;
a solid latchbolt coupled to the rod including a strike engaging portion; and
an anti-friction bolt carried by and pivotally coupled to the solid latchbolt, the anti-friction bolt including a cross member and a pair of plates depending orthogonally from the cross member, the cross member and plates cooperating to form a U-shaped cross-section, the anti-friction bolt being disposed to overlap the solid latchbolt on a plurality of exterior sides of the solid latchbolt, the anti-friction bolt configured to assist in retraction of the solid latchbolt wherein when the anti-friction bolt pivots relative to the solid latchbolt in a first direction, the cross-member engages and forces the solid latchbolt to at least partially retract along a length of the rod.

10. The latchbolt assembly of claim 9 , wherein the solid latchbolt includes a strike engaging portion having a beveled camming surface and the cross member overlaps a portion of the beveled camming surface.

11. The latchbolt assembly of claim 9 , wherein the anti-friction bolt is pivotably coupled to the solid latchbolt and the solid latchbolt is fixedly coupled to the rod.

12. A method of reducing friction on latches, the method comprising:
positioning a latchbolt within an interior of a mortise box, the latchbolt having a strike engaging portion with a camming surface being extendable from the mortise box; and
coupling an anti-friction bolt to the latchbolt such that the anti-friction bolt is rotatable relative to the latchbolt to position a portion of the anti-friction bolt in an overlapping relationship relative to the camming surface of the latchbolt and such that the anti-friction bolt is translatable relative to the mortise box along with the latchbolt, wherein the anti-friction bolt is configured to assist in retraction of the latchbolt, wherein when the anti-friction bolt pivots relative to the latchbolt in a first direction, the anti-friction bolt engages the camming surface and forces the latchbolt to at least partially retract with the mortise box.

13. A latchbolt assembly comprising:
a rod;
a latchbolt including a strike engaging end having an exterior camming surface and a base end positioned opposite the strike engaging end, the latchbolt further having a first side extending between the strike engaging end and the base end and a second side extending between the strike engaging end and the base end, the second side being opposite the first side, the latchbolt being coupled to the rod; and
an anti-friction bolt moveable relative to the latchbolt, the anti-friction bolt being positionable adjacent the exterior camming surface of the strike engaging end of the latchbolt to overlap the exterior camming surface of the strike engaging end of the latchbolt and configured to assist in retraction of the latchbolt, wherein when the anti-friction bolt pivots relative to the latchbolt in a first direction, the anti-friction bolt engages the exterior camming surface and forces the latchbolt to at least partially retract along a length of the latchbolt assembly.

14. The latchbolt assembly of claim 13 , wherein the exterior camming surface of the latchbolt intersects a longitudinal axis of the rod.

15. The latchbolt assembly of claim 13 , wherein the exterior camming surface of the latchbolt is a beveled camming surface.

16. The latchbolt assembly of claim 13 , further comprising
a tailpiece having an open interior, the rod being received in the open interior of the tailpiece;
a bushing carried by the rod and positioned between the latchbolt and the tailpiece; and
a spring carried by the rod and positioned between the latchbolt and the bushing.

17. The latchbolt assembly of claim 13 , further comprising
a retaining screw coupling the rod to the latchbolt, the retaining device being received in a first opening of the latchbolt having a first longitudinal axis and the rod being received in a second opening of the latchbolt having a second longitudinal axis, the first longitudinal axis of the first opening being non-parallel to the second longitudinal axis of the second opening.

18. The latchbolt assembly of claim 13 , wherein the latchbolt is a solid latchbolt.

19. The latchbolt assembly of claim 13 , wherein the anti-friction bolt is pivotable relative to the latchbolt.

20. The latchbolt assembly of claim 13 , wherein the anti-friction bolt includes a first leg overlapping a portion of the first side of the latchbolt, a second leg overlapping a portion of the second side of the latchbolt, and a cross member extending between the first leg and the second leg, the

Assignees

• Stanley Security Solutions Inc
• Dormakaba Usa Inc

Inventors

• Hickman Chad A

Classifications

• E05C1/02 Primary

  without latching action · CPC title

• E05B17/007

  Devices for reducing friction between lock parts (E05B17/08 takes precedence) · CPC title

• E05C1/085 Primary

  With means for assisting depression of the latch bolt during latching · CPC title

• E05B15/102

  Bolts having movable elements (E05B23/00 takes precedence) · CPC title

• Y10T292/096

  Sliding · CPC title