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Number # GB600000A # #
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Title
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Improvements relating to diaphragms for fluid operated mechanisms
Abstract
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600,000. Diaphragm pistons. BULLOWS and SONS, Ltd., A., and BOYCE, G.
B. Sept. 27, 1945, No. 25115. [Class 122 (i)] A fluid-actuated mechanism
comprises a rod e to be operated by fluid pressure applied to one or either
side of a diaphragm d connected to the rod e. The casing a has a groove c,
the width of which is approximately the same as the thickness of the
diaphragm so that the diaphragm is freely supported and when fixed may slide
radially in the groove. The edges of the groove are curved to allow the
diaphragm to flex freely. Alternatively, the inner periphery of the
diaphragm may be supported similarly.
Description
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PATENT SPECIFICATION
Application Date: Sept. 27, 1945.
6009000 No.25115/45.
Complete Specification Left: Aug. 12, 1946.
Complete Specification Accepted: March 25, 1948.
P1ROVISIONAL SPECIFICATION
Improvements relating to Diaphragms for Fluid Operated Mechanisms We,
ALFRE;D BULLOWS & SONS LIMITED, a British Company, of Long Strejet Works,
Walsall, in the County of S'tatford, and GuY BARON BoYCE, a, British
Suibject, of the Conmp'any'os address, do hereby declare the nature of this
invention to be as follows:In,some forms of fluid operated mechanisms having
a movable part to which it its required to imppart oinly a short movement by
fluid pressure, it is customary to employ a hollow body having its; interior
divided into a plair of 'comip'artments by a flexible.diaphragm, the latter
being attached to the movable pait, and' the body part; havig connections
whereby fluid claxn 'b' admitted to one or either side of the dia-Uhragm.
Usulally the periphekral margin of the 'diaphrlagm is' clamped.securely
between separate parts' of the body, with the result that the dilaphragm is
subj'ectield to und'esirable( stresses when the fluid pressure is aspplied.
This ditsadvantaget can be' 2r5-aavoided by the use of a piston insteaid; of
a diaplhragm, but the use of a piiston in many 'cases involves other
disad-viantages. The 'object of the present invention eis toi enable the
advantages of thei diaphragm tot be retained and at the same) time avoid
the'disadvantaige atbave, mentioned, and for this purploise the iivention
comprises a construction in which the' peripheral margin of the diaphragm is
accommodated freely bewtween the parts of the body in a mainner which peru
mits) the diaphragm to' be' flexed without setting up undesira-ble stresses.
In one, manner of construction a pneumatically operated mechalnism in
accordance with the' invention, we employ a hollow-body consisting o'f a
pair of parts whifch are secured together by screws or other appropriate
means. These- plaxrts are shaped internally to form a circum- 46 feren'tial
groove for accommodating thei peripheral margin of the diaphragm, which may
be ma'd'e from leather, rubber, or other like flexible material, the width
Of the groove beiing approximately equal 50 to the thickness oгуf the
idilalpphragm. Also the opposite' faces of the groOve are preferably curved
to a shape corresponding to 'the form which the marginal part o&, the
diaphragm will naturally assumes 5a when dislplaced from its central
position.
The- diaphragm has secured to' itts.oenotre a 'short,plunger whieh
extends through a gland in one or each of the body parts, and also the
opposite faces of the diaphragm may be clamped between a pair of metal or
other discs Whicth;are held' in,position by collars on the plunger, the
inner fa'ces of the discs bting suitably shape'd to allow the desired
freedom 65 of flexure of the diaphragm.
The construction is such thait wheni compressed air is admitted to
either side of the diaphragm. for actuating the' plunger, the dilaphragm is
flexed, but as' 70 its, marginal plart is frde to bend and' slide radially
in Pelation to the' body, no undesirable stresses axe, set up. in the
diaphragmr. The' required fluid tighV joint between the diaphragm and the'
75 body is ensured by the pressure of miarw.
ginal part of the diiaphragm utnder the' action of the comprestsed aiir
againfst one or the other of the sidle surfaces of the groove in'the body.
80 From the foregoing description it will be understoo'd' that the purpose
of 'the invention can be aei .eveld in a very simple and isatisfactory
manner.
Dated this, 14th day of September, 194,5.
MARKS & CLERK.
[Price 11_d fe W 7, ' , ' 94 "f, i farmer i 1 WZI111.k - - g 600,000
COMPLETE SPECIFICATION
Improvements relating to Diaphragms for Fluid Operated Mechanisms We,
ArLFR33} BuLLOWs & SONS LImITED, a British Coompany, of Long Street WAorks,
Walsall, in the County of Staftord, and Gru BARON BoYCE, a a British
Subject, of the Company's address, do -hereby declare the nature of this
in-veintion, and in what manner the same is to be performed, to be
particularly described and ascertained in and io by the following
statement: -
In some forms of fluid operated mechanisgus of the type' having a.
movable part to which it is required to impart only a short movement by
fluid pressure, it is customary to employ a. hollow body having its interior
divided into a, pair of ecompartanents by a fiexibile diaphragm, means being
provided whereby fluid can be a'dmitted to one or either side of the
diaphragm. Usually the peripheral margin of the diaphragm is clamped
securely between separate parts of the body, with the result that the
diaphrag, is subjected to undesirable stresses when the fluid pressure! is
applied. This disadvantage can be avoided by the use of 'a piston instead
oef a diihphrag,-m, but the use of a piston in many cases involves other
disadvantages.
The object of the present invention is to enable the advantages of the
diaphragm to be retained and at the same time avoid the disadvantage above
mentioned, and for this purpose the invention comprises a construction in
which a peripheral part of the diaphragm is supported freely between parts
which permit the diaphragm to be flexed without sefting up undesirable
stresses.
In the accompanying drawings:Figure 1 is a sectional elevation
illustrating a 'double-acting pneumatically operated mechanism embodying the
invention, and Figure 2 is a. similar view Allustrating a single acting
mechanism.
Referring to Figure 1, we employ a hollow body ai consisting of a. pair
of parts which are secured together by screws as b or other appropriate
means.
These parts are shaped internally to form a circumferential groove c
for accommodating the peripheral margin of the diaphrag.m d, which may be
made from a5 leather, rubber, or other like flexible material, the width of
the groove being approximately equal to the thickness of the diaphragm. Also
the opposite faces of the groove are preferably curved as shown to a shape
which will allow the 60 adjacent marginal part of the diaphragm to bend
freely when displaced from its central position. The diaphragm has secured
to its centre a. short plunger e which extends through a. gland p in one 65
(or each) of the. body parts, and also the opposite faces of the diaphragm
may be clamped between a pair of metal or other discs g which are held in
position by colla.rs h on the plunger, the inner faces 70 of the discs being
suitably shaped to allow the desired freedom of flexure of the diaphragm.
The construction iss tsuch 'thait when compressed air is admitted
(through 75 pipe connections i) to either side of the diaphragm for
actuating the plunger, the diaphragm is flexed as shown, but as ifts
marginal part is free to bend and slide radially in relation to the body, no
undesirable stresses are set up in the diaphragm. The required fluid tight
joint between the diaphragm and the body is ensured by the pressure of the
marginal part of the diaphragm under the action 85 of the compressed air
against one or the other of the side surfaces of the groove in the body.
In the example shown at Figure 2, a hollow body part a is employed.
Within 90 the body part is secured by screws k a ring in.. The parts a, mn
are. shaped to form a circumferential groove c adapted as above described to
receive the periphery and support the adjacent marginal part of the
diaphragm d. At the underside of the diaphragm is arranged a cross-head n
formed with a part o which extends through the ring mn and makes contact
with the underside of the 100 diaphragm. To the cross-head X are secured
a^pair of posts p which extend through guide bushes q in the body part and
are adapted to actuate, for example, a clamp for securing a work piece in
l(05 position on a machine tool. The posts have combined with them springs r
which are supported by a- hollow cover piece s, the latter being secured to
the underside of the body part a. The springs 110( r serve to move the
cross-head n, and posts p in the upward direction. Movement in the opposite
direction, in opposition to the springs, is effected by compressed air which
is admitted to the 115 body part at a position above the dia600,000 plhragin
through a passage, i under the control of any conveniently situated valve.
Froan the foregoing it will be; seen that the purpose of the invention
can be aehi'eve'd in a very:simple anad satisfaotory manner. The inrwention
is not, however, restricteid to the examples illustrated, as subordinate
details of construetion may be varied to suit different requirements.
Further instead of supporting the diaphragm between the body parts as
above,described, an annular diiaphragm may be supported freely ai its isner
periphery on a, ranm or plunger, the outer periphery being fixedly or freely
supported between the body parts.
Having now particularly,delscribe'd and ascertained the nature of our
said invention and in what manner the same iis to be performed, we declare
that what we claiim is: 1. A fluid operated mechanism of, the type
specified, in whiclh a peripheral part of the diaphragm is supported freely
25 between parts which permit thei diaphragm to be flexed without setting up
imndesirable Asitresses.
2. A fluid operated mechani!sm as
Claims
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cl.aimed in Claim 1, having a hollow 30
body pailt provided with ai cirdumfewential groove for accommodating
the outer peri'pheral margin of the dilaphragm, the width of the groove,
being approximately equal to. the thicknress of 35 the diaphragm, and the
oppolsite faces of the groove being shaped to, allow biending of the
dtiaphra<,.
3. A fluid operated mechanism of the typte specified, and having its
diaphragim 40 supipiortea at its outer margin substantially as described and
as shown by Figure I or 2 of the accompanying drawings.
Dated this 26th day of June, 1946.
MARKS & CLERK.
Leamington Spa: Printed for His Majesty's Stationery Office, by the
Courier Press.-1948.
Published at The Patent Office, 25, Southampton Buildings, London,
W[[C]]2, from which copies, price ls. Od. each (inland) ls. ld. (abroad) may
be obtained.
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