An Improved Scaffolding Trestle.
Year: 1890

page_text: Date of Application, 27th Mar., 1890
Complete Specification Left, 26th Nov., 1890-Accepted, 27th Dec.. 1890
PROVISIONAL SPECIFICATION.
An Improved Scaffolding Trestle.
We FRIEDRICH AUGUST LAESECKE Manufacturer and CARL GUSTAV RIEDEL Master
Carpenter both of Leipzig in the Empire of Germany do hereby declare the nature of
this invention to be as follows :--
This invention relates to trestles for supporting scaffolding and consists in an
improved scaffolding trestle made of detachable parts so that it may be stored in a
Sinall space and having improved means for adjusting the length of the legs.
The parts comprise two shoes preferably of metal made of convenient length each with
a slot or recess running lengthwise therein to receive and support the horizontal plank
which is fitted edgeways in said slot or recess. On the opposite sides of each shoe
are recesses or sockets made to receive the ends of the legs the latter being tapered and
fitted to the said sockets so that the shoes are supported on the said legs firmly and
securely. The legs are made each in two parallel parts fitting into or engaging with
each other by contrarily sloping ratchet teeth. The two parts are held together
securely after being set in required position by the insertion of wedges into bows
hinged to one leg and passing over the other or by the rotation of cams or eccentrics
on the said bows having the same effect as the wedges to hold the two parts firmly
pressed together with their teeth interlocked. One of such trestles can be used alone,
a sufficient width of platform being supported thereon by placing two or more cross
frames on the horizontal plank aforesaid said frames having angular pieces embracing
the plank between them, and by placing boards on said frames; or two of the
improved trestles may be employed placing them parallel to each other an placing
boards across the two in the usual way.
Dated this 27th day of March 1890.
HERBERT & CO.,
Agents to Applicants.
COMPLETE SPECIFICATION.
An Improved Scaffolding Trestle.
We FRIEDRICH AUGUST LAESECKE Manufacturer and CARL GUSTAV RIEDEL Master
Carpenter both of Leipzig in the Empire of Germany do hereby declare the nature
of this invention and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement:―
This invention relates to trestles for supporting scaffolding and consists in an
improved scaffolding trestle made in detachable parts so that it may be stored in a
small space having means for adjusting the length of the legs and especially so
constructed that the placing of weight thereon tends to hold the parts in firm
connection.
The parts comprise two shoes preferably of metal made of convenient length each
with a slot or recess running lengthwise therein to receive and support the horizontal
plank which is fitted edgeways in said slot or recess. On the opposite sides of each
shoe are recesses or sockets made to receive the ends of the legs the latter being
tapered and fitted to the said sockets so that the shos are supported on the said legs
firmly and securely. The legs are made each in two parallel parts fitting into or
engaging with each other by contrarily sloping ratchet teeth. The two parts are held
together securely after being set in required position by the insertion of wedges into
bows hinged to one leg and passing over the other or by the rotation of cams or
eccentrics on the said bows having the same effect as the wedges to hold the two parts
firmly pressed together with their teeth interlocked. One of such trestles can be used
ID 21
.

page_text: alone a sufficient width of platform being supported thereon by placing two or more
cross frames on the horizontal plank aforesaid, said frames having angular pieces
embracing the plank between them, and by placing boards on said frames, or two of
the improved trestles may be employed placing them parallel to each other and placing
boards across the two in the usual way.
}. 4.
Reference being made to the annexed drawing Fig. 1 is an elevation of two of the
legs fitted into one of the shoes the latter being shown in section. Fig. 2 is a side
elevation thereof. Fig. 3 is a plan view thereof. Fig. 4 is a cross section, and Fig. 5
a broken side elevation of the horizontal plank with one of the frames thereon for
supporting a platform. Fig. 6 is a side elevation on a smaller scale of the whole
trestle with boards placed across the top. Fig. 7 illustrates a modification in the
fixing of the legs. Figs. 8 9 and 10 are respectively side elevation plan and end
elevation of a modified form of shoe.
a is the shoe lengthened about the base of the slot or recess a¹ for receiving the
horizontal plank c (Figs. 5 and 6) a² a² are the lateral sockets on the shoe a to receive
the ends of the legs b fitted loosely therein and held securely by the taper of the sockets.
Each of the legs b is made in two parallel parts the one fitting into the socket a² at
the upper end. These parts are respectively provided with ratchet teeth inclined in
contrary directions so that they may be securely held together without any danger of
slipping, by suitable means such as the levers bearing in the back of the part b said
levers being pivoted between the connecting plates n which are pivoted to the under
part as shown in Fig. 1 or by the insertion of the wedges i into the bows m
pivoted to the under part and passing over or around the upper part as in Fig. 7.
The cross frames to be supported on or by the plank e consist each of a sole plate
baving the two angle frames d d fastened on its lower side so that the frame rests on
the plank e with the sole plate horizontal the angle frames dd bearing against the
opposite sides of the plank c. The ends of the sole plate may be bent upward to
prevent the boards 9 which rest on the cross frame parallel to the plank c from
slipping off. Figs. 8 to 10 illustrate a lighter form of shoe designed so that the
pressure of the legs tends to press inwards the sides of the recess a¹ and cause the
latter to firmly grip the plank c.
:
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is
1) An adjustable scaffolding trestle for workmen having the shoes a each of which
shoe supports the plank c at 4 points in the slots or recesses a¹ of said shoes, the plank c
being gripped by the action of weight on the scaffolding trestle.
2) In the scaffolding trestle having the shoe a the combination therewith of the
legs b consisting of two parts connected by teeth for the purpose of lengthening the
legs and fastenings for said parts substantially as set forth."
Dated this 26th day of Natambar 1900
HERBERT & Co.,
18, Buckingham Street, Strand, London, W.C., Agents to Applicants.