US 11,788,252 B2
Laying machine and a blade assembly
Lars Gustafsson, Töreboda (SE); Rolf Johansson, Glumslöv (SE); Fredrik Sjödahl, Jönköping (SE); Tobias Nilsson, Huskvarna (SE); and Donald F. Meister, Overland Park, KS (US)
Assigned to HUSQVARNA AB, Huskvarna (SE)
Filed by HUSQVARNA AB, Huskvarna (SE)
Filed on Mar. 16, 2022, as Appl. No. 17/696,489.
Application 17/696,489 is a continuation of application No. 16/186,833, filed on Nov. 12, 2018, granted, now 11,280,060.
Application 16/186,833 is a continuation of application No. 15/000,598, filed on Jan. 19, 2016, granted, now 10,370,820, issued on Aug. 6, 2019.
Application 15/000,598 is a continuation of application No. 13/982,253, granted, now 9,267,620, issued on Feb. 23, 2016, previously published as PCT/SE2012/000007, filed on Jan. 26, 2012.
Claims priority of application No. PCT/SE2011/000013 (WO), filed on Jan. 26, 2011; and application No. PCT/SE2011/050958 (WO), filed on Jul. 21, 2011.
Prior Publication US 2022/0205216 A1, Jun. 30, 2022
Int. Cl. E02F 3/18 (2006.01); E02F 5/08 (2006.01); E02F 5/10 (2006.01); E02F 5/14 (2006.01); E02F 7/02 (2006.01); H02G 1/06 (2006.01); B23D 45/10 (2006.01); B23D 59/02 (2006.01); B23D 61/02 (2006.01); B28D 1/04 (2006.01); B28D 1/18 (2006.01); B28D 7/02 (2006.01); E02F 9/00 (2006.01); F16L 1/032 (2006.01); E02F 5/12 (2006.01); F16L 1/028 (2006.01)
CPC E02F 5/08 (2013.01) [B23D 45/10 (2013.01); B23D 59/025 (2013.01); B23D 61/026 (2013.01); B28D 1/045 (2013.01); B28D 1/18 (2013.01); B28D 7/02 (2013.01); E02F 3/188 (2013.01); E02F 5/10 (2013.01); E02F 5/101 (2013.01); E02F 5/12 (2013.01); E02F 5/145 (2013.01); E02F 7/02 (2013.01); E02F 9/00 (2013.01); F16L 1/028 (2013.01); F16L 1/032 (2013.01); H02G 1/06 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A blade assembly for working on a work surface or structure, the blade assembly comprising:
a first blade, a second blade, and a third blade, wherein the first blade, the second blade, and the third blade are axially aligned relative to a center;
a first spacer structure configured to space apart the first blade and the second blade; and
a second spacer structure configured to space apart the second blade and the third blade;
wherein the first spacer structure comprises a first sidewall and a second sidewall that form a first spacer compartment between the first blade and the second blade;
wherein, extending radially from the center, the first spacer compartment widens due to the first sidewall and the second sidewall diverging for a first radial distance and then the first spacer compartment narrows due to the first sidewall and the second sidewall converging for a second radial distance;
wherein the first spacer compartment is aligned with an inlet in the first blade or the second blade.