Improvements in and relating to Joints for Derrick Legs, Telegraph Poles, and the like.
Year: 1897

page_text: Date of Application, 14th Dec.,
1897
PROVISIONAL SPECIFICATION.
Improvements in and relating to Joints for Derrick Legs, Telegraph
Poles, and the like.
I, FRANK BAKER, of 43, Upper Bedford Place, London, W.C., Engineer, do
hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in the construction of derrick legs,
telegraph poles and the like, and its object is to provide means for efficiently
securing the longitudinal members of the legs to the horizontal and diagonal
braces, while also providing a means of constructing the said longitudinal mem-
bers in sections, if so desired, without the use of scaffolding or braces during
construction. The invention is peculiarly applicable to derrick legs or telegraph
poles having tubular longitudinal members, and it consists broadly speaking
of a tubular joint of a particular construction hereinafter described, forming the
junction of the said longitudinal members and specially arranged studs upon
which the braces or stays are pivotted.
In carrying the invention into effect according to one modification as applied to
a derrick having 3 tubular, longitudinal members and braced together by hori-
zontal and diagonal stays, the construction is as follows, Each tube at the point
of junction of the stays has inserted within it a short length of tube, while upon
the outer periphery of the said tube a ring or collar is shrunk preferably of
about 3" in length. In the centre longitudinally of this ring or collar two studs
are inserted by drilling and tapping holes to receive them, at the proper angle
and distance apart to suit the triangular form of derrick, and these studs pene-
trate through the one side of the said ring. It is to be understood that the ring
or collar may be keyed or otherwise securely fastened instead of being shrunk on
to the short length of tube referred to.
At suitable distances along each tubular member of the derrick these collars or
rings are arranged, and on 3 individual longitudinal members the collars with
the studs face each other, so that the stays can be arranged thereon as follows,-
Upon each opposing stud and collar of any two longitudinal members, a horizontal
stay is placed and from each of these said studs one end of a diagonal stay passes
above the said horizontal stay to the next upper collar upon the opposite tubular
member, and one end of another diagonal stay passes below the horizontal stay
to the next underneath collar of the opposite tubular member. This construction
is repeated throughout the entire length of the derrick and it is evident that by
arranging these cross stays in two halves with right and left hand screws at their
point of separation, a screwed tube or collar working thereon may be used to
brace all the stays together in the usual manner.
When erecting the derrick the tubular members are slipped over the ends of
the short tube and butt against the shrunk ring or collar and the bottoms of the
said tubular members are turned to ensure accurate butting and fitting on the
respective bottom and top sides of the tubular joint. It is to be understood that
when the tubular members are much larger than the tube of the joint, internal
rings may be fitted and turned to suit the joints.

page_text: The hereinbefore described diagonal and horizontal stay is of course the usual
structural arrangement, where brace struts of this kind are used and it is to be
understood that the essential feature of the invention is the provision of short
tube and ring joints, not only securing, if need be sections of the tubular members
together, but also providing points of attachment for the diagonal and horizontal
stays. It is evident that the invention may be suitably varied to meet the method
of bracing and the number of longitudinal members by suitably altering the
number and angle of studs screwed into the collars or rings.
The bottom and top ends of the derrick legs may be screwed to the timbers or
ironwork by having inner solid bolts instead of tubes, these bolts may be bent to
any desired angle according to the rake of derrick so as to allow the screwed end
of bolt to pass through timber and at right angles if desired:
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents.
Improvements in and relating to Joints for Derrick Legs, Telegraph
Poles, and the like.
I, FRANK BAKER, of 43, Upper Bedford Place, London, W.C., Engineer, 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 joints for use in the construction of derrick crane legs,
telegraph poles, and the like, and has for its object to provide means for efficiently
securing the constituent members or parts in sections, and is more particularly
applicable for use in the construction of the legs of derrick cranes where the
further object is to provide means for securing the horizontal and diagonal
members to the longitudinal members of the derrick and thereby so constructing
the derrick that the use of scaffolding or braces is not necessitated during
construction.
The invention consists of a junction or jointing piece or tube which has integrally
provided thereupon an enlargement or ring having the extremities of the piece or
tube upon either side thereof, so that such extremities may be inserted within
the respective hollow extremities of the members or parts to be connected and
so that the enlargement or ring may form an abutment therefor; and the inven-
tion further consists in features of design hereafter described as applied.
The invention is illustrated in the accompanying drawings, in which:-
Figure 1 represents a longitudinal section through a longitudinal member or
leg of a derrick crane, while
Figures 2 and 2" are respectively sectional elevations on lines v and y z
Figure 1, and
Figures 3 and 4 are respectively diagrammatic plan and elevation shewing the
method of construction employed in connection with the means of jointing.
In carrying the invention into effect according to one modification in the con-
struction of a derrick crane having three tubular longitudinal members or legs
braced together by horizontal and diagonal stays, each section A A1 A2 A³ con-
stituting a leg has inserted therein a short length of tube B having centrally
provided upon its outer periphery a ring or collar C. preferably shrunk thereon
or keyed and of 3 inches or other suitable dimension in length. The opposing

page_text: When
extremities such as a a¹ of the sections of the tubes such as A A¹ to be connected,
firmly abut against the machined faces of the enlargement or ring C, while the
respective extremities of the junction or jointing tube B loosely fit the bore of the
tubes A A so that the building up of the sections is easily effected.
the tubular sections constituting the longitudinal member vary in their internal
diameter the junction or jointing tube may be of a diameter corresponding to the
smaller, while an internal ring or rings such as E & E¹ may be shrunk or
secured thereupon so as to ensure a proper fit within the tube of larger diameter,
or a collar may be provided thereupon at the extremity of which the enlargement
or ring C may be integrally provided and the collar and ring may then be
shrunk or keyed on the tube.
In the construction of a derrick crane the respective longitudinal members
such as H, I, J, have their constituent sections of the same length so that the
junction collars C are oppositely disposed, and by means of the studs F and G
provided thereupon in suitable angular positions horizontal stays K as well as
diagonal stays L and M are secured, so that these longitudinal members are
effectively braced together. The diagonal stays may be tightened by means of a
tightening swivel with right and left hand screw threads in the usual way. The
lower extremities of the longitudinal members of the structure are secured to
the foundation timbers or joists N or to supporting ironwork, by such means as
illustrated in Figure 1 consisting of a bolt O having shrunk or secured within
the tube A an enlarged extremity, collar or flange P, and a collar or flange P1
the extremity of the tube A4 abutting upon the face of the collar C which is
supported in its inclined position by means of an inserted wedge washer. The
bolt passes through the timber or joist N and is firmly secured thereto by means
of a nut Q. Similarly the upper extremity of the longitudinal members are
secured to the upper joists or timbers or to the ironwork forming the upper part
of the derrick crane by means of a bolt (1 as illustrated, the bolts in each case
being bent to any desired angle according to the rake of the legs so as to permit
of the screwed extremity of the bolts passing through the timber, joists or iron-
work at right-angles thereto as required.
No limitation is placed to the construction of derrick cranes as it is obvious that
the same design is applicable to other services.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the saine is to be performed, I declare that what F
claim is:-
1. Means for connecting the constituent parts or sections of derrick legs, tele-
graph poles and similar structures consisting of a junction or jointing piece or
tube having provided integrally thereupon an enlargement or ring, the extremities.
of which piece or tube serve to fit within opposing hollow extremities of the
parts or sections to be connected substantially as herein before described.
2. The construction of derrick cranes and other similar structures substantially
as and for the purpose hereinbefore described.
3. Means for jointing or connecting the constituent parts or sections of derrick
legs, telegraph poles and the like substantially as and for the purpose herein-
before described.
Dated this 1st day of April 1898.
MARKS & CLERK,.
18, Southampton Buildings, Chancery Lane, London, W.C., and
13, Temple Street, Birmingham, Agents.