Lawn-Trimming Machine Page: 3 of 4
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UNITED STATES PATENT OFFICE.
JOHN P. CADY, OF SAN ANTONIO, TEXAS.
LAWN-TRIMMING MACHINE.No. 856,940.
Specification of Letters Patent.
Application filed February 20, 1907. Serial No, 358,383.To all whom it may conlCernm:
Be it known that I, JOHN P. CADY, a citi-
zen of the United States, residing at San An-
tonio, in the county of Bexar and State of
5 Texas, have invented new and useful lu-
provements in Lawn-Trin i uiing Machines, of
which the following is a specification.
This invention relates to machines for
trimming the edges of lawns or grass plots
;o which cannot be readily trinuned by the use
of the automatic lawn mower without expos-
ing the latter to injury by causing the blades
to come into contact with the soil and gravel;
and the invention has for its object to pro-
15 vide a machine of this class which shall pos-
sess superior advantages in point of simplic-
ity, durability and general efficiency.
With these and other ends in view which
will readily appear as the nature of the in-
to vention is better understood, the same con-
sists in the improved construction and novel
arrangement and combination of parts which
will be hereinafter fully described and par-
ticularly pointed out in the claims.
25 In the accompanying drawings has been
illustrated a simple and preferred form of the
invention; it being, however, understood
that no limitation is necessarily made to the
precise structural details therein exhibited,
30 but that changes, alterations and iodifica-
tions within the scope of the invention may
be resorted to when desired.
In the drawings, Figure 1 is a top plan
view of a lawn training machine construct-
35 ed in accordance with the principles of the
invention. Fig. 2 is a side elevation of the
same. Fig. 3 is a vertical transverse sec-
tional view taken on the plane indicated by
the line 3-3 in Fig. 1. Fig. 4 is a side eleva-
4o tion, partly in section, of the driving wheel,
showing the clutch mechanism for driving the
cutter carrying shaft of the machine. Fig. 5
is a sectional detail view taken on the plane
indicated by the line 5-5 in Fig. 2.
45 Corresponding parts in the several figures
are denoted by like characters of reference.
The frame of the machine consists of an
approximately triangular casting A having
bearings for the transversely disposed cutter
50 carrying shaft 1. The frame is provided at
one side with a forward extending lug 2 sup-
porting a bolt or pin 3 upon which the drive
wheel 4 is supported for rotation; said drive
wheel having a transversely corrugated rim
55 as clearly shown in Fig. 1. The drive wheel
is provided with an internal gear 5 meshingPatented June 11, 1907.
with a pin)iion 6 upon the cutter carrying
shaft 1, one endI of which extends within the
drive wheel through a casing plate 7 which is
supported upon the pill or bolt 3 and has au 6o
aperture S for the passage of the cutter car-
rying shaft. The casing plate 7 serves to
prevent the passage of sand and dirt into the
casing formed by the drive wheel where it
would be liable to interfere with the opera- 65
tion of the niachlne.
The pinion .6, which loosely engages the
cutter carrying shaft, is provided with a re-
cess 9 having interiorly disposed ratchet
teeth 10 adapted to be engaged by a pawl 11 70
that is seated in a transverse recess 12 in the
cutter carrying shaft which is forced in an
outward direction by means of a spring 13;
said pawl being provided with a beveled
edge 14 enabling it to slip by the ratchet 75
teeth 10 when the drive wheel is rotated
backward; when the drive wheel is rotated
forwardly, by the propulsion of the machine
in a forward direction, the pinion 6 will be
rotated by the internal gear 5, and one of the 8o
ratchet teeth 10 will enlgage the spring actu-
ated pawl 11, thus positively rotating the
cutter carrying shaft.
The end of the shaft 1, opposite to the
drive wheel, projects at one side of the frame 85
A, and carries a hub 15 secured by a set screw
16 and having a plurality of radial arms 17.
carrying blades or cutters 18. The frame A
is provided with a slot or recess 19 in which
is secured a stem 20 having a head 21 pro- 90
vided with a plurality of fingers 22 disposed
in an approximately vertical plane, and di-
verging forwardly as will be clearly seen by
reference to Fig. 2 of the drawings, said fin-
gers having terminal points 23. The stem 19 95
is secured adjustably by means of a set screw
24, enabling the fingers to be accurately ad-
justed in such a manner as to contact lightly
with the faces of the blades or cutters 18,
which latter will operate conjointly with the 100
fingers 22 to effect a shearing cut. By the
construction described, the blades or cutters
will be what is known as self - sharpening,
since the friction of the faces of said blades
against the inner faces of the fingers will tend. 105
to sharpen the edges of the blades, as will be
readily understood; wear upon the blades of
the fingers may be compensated for by prop-
erly .adjusting the stem 19 carrying the fin-
gers. 10
The frame A is provided in rear of the fin-
ger carrying stem with a laterally extending
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Cady, John P. Lawn-Trimming Machine, patent, June 11, 1907; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth508519/m1/3/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.