US1095926A - Fluid-pressure cylinder and piston. - Google Patents

Description

J. E. POWELL.

FLUID PRESSURE CYLINDER AND PISTON.

APPLICATION FILED DEO. 3, 1913.

Patented May 5, 1914.

II-IIII @19H/neme Ww aff@ To all who-mit may concern:

sTATns PATENT curro :ro'HNj E.. Rowena., or retransmis, amener-A.

Be it known that lfl', JOHN E. Pownnr., a citizen of thelUni/ted States, residing at' Augusta', in thefcou'nty of Richmond' and State of Georgiafhaveinvented new and useful Improvements in and' Pistons,A of specification.

. This inventionrelates to' improvementsl in; fluid pressure cylinders and' pistons for use in connection with any preferred type of apparatus operated by air, steam or other' fluid pressure, the object of' the invention,

being to provide a telesco-pic'construction of cylinder andj piston which is adapted tov collapse in close compass and which is adapted tobe extended to secure a desired length of travel, suchv construction of cylinder and piston being of value where the space isl limited at the-starting point and where the use of; a collapsible fluid pressure -`,power device is a factor.

A further object of the invention is to provide a telesco-pic cylinder and piston which is simple, reliable and comparatively inexpensive of construction, which is so constructed as to maintain the collapsible sec-l tions in rigid alinement when extended, and which is adapted to effectually cushion the inward movement of said collapsible sections.

The invention consists of the features of construction, combination and arrangement of parts herein fully described and claimed, reference being had to the accompanying drawing in which Figure '1 is a vertical section' of my im proved telescopic cylinder and piston as it appears whenthe piston isextended to the full extent.- AFig..2 is a similar view of the cylinder and piston showing the parts in collapsed condition. Fig. 3 vis a detail view of the bottom cylinder head and cushioning element. Fig. 4 is a det-ail section through one of the piston sections, showing the packing gasket. y

Referring to the drawing,

which the' following. is a 1 designates the cylinder,`z-which is provided at its base` with a flange 2, to which is detachably secured a bottom head 3 having a 'flange 4 abutting against the flange `2, bolts 5v passing through said flanges and securing said bottom head in position. The body of the bottom head is offset downwardly to ,provide a counter-sink or concavity 6 having a beveled marginal wall 7 said cavity receiv.

Specication of etters Patent. applicati meaisecemeersy 1era; semina. 804,479. f r

Fluid-Pressure Cylinders whereby the cus ton sections.

FLUID-.PRESSURECYLINDER ANDx PISTON.

PatentediMa'y 5f, 19142.

ying' a cushioning 'element 8, adapted to' sustain the impact of the downward, closing or collapsing movements of thepiston sections. This cushion may' be made of rubber, or other suitable material, and is herein shown in the' form of a disk having. a beveled surface 9' contacting with the beveled wall 7,

undue enlargement of distention of i'oning element is prevented.

The piston comprises a head or inner member 10, to which is connected' Athe piston rod 11, and one or'n'iore outer hollowl or tu-v bular sections, two of which are shown in the' present instance and designated' 1'2 and 13, respectively. The upper end of the cylinder 1' and upper end of each of the piston sections 12 and 13' is provided with an'annular inturn abutment flange 14, while the lower end of each of said cylinder sections 12 and13 1s provi'ded'with an outturned annular abutment' flange 15'. The piston 10 when moved upwardly is adapted to engage the. flange 14 of' the section 12, and the flanges 15 of the section 12 is adapted to engage the flange 14 of the section 13, while the flange 15 of the section 13 is in turn 'adapted to engage'the flange 14 of the cylinder 1, whereby the outward movements of the respective sections of the pistons are limited and said sections adapted to' be coupled to leach other 'on' its outward movement to extend or raise the piston to the limit ofits upward movement. The cylinder is provided with l a fluid pressure inlet 16 opening through its bottomhead, and in practice suitable valve controlled supply and exhaust connections are employedtoregulate the ilowy of fluid pressure to and from the cylinder land pis- These fluid supply and exhaust connections are not herein shown, as they constitute no part of the present invention. When the piston is collapsed, as shown in Fig. 2, the .sections telescope within veach other and are inclosed wholly vwithin the cylinder l, and the lower abutment portions thereof contact withthe cushioning member 8, which sustains the downward impact as each cylinder section reaches the limit of its downward travel, thusreducing all jars and concussions. cylinder and piston sections are of sulficient area to stay and rigidly support the piston sections and prevent Wabbhng. thereof when said piston sections are extended, as

will be readily understooid.

It will 'be apparent4 fromI the foregoing The abutment flanges of the that the construction described insures a desirable long range of travel of the piston and flange 15 of each piston section 12 and 13 is provided with suitable packing, preferably comprising a leather packing ring 17 clamped and held against its bottom face by a clamping ring 18 secured to the piston member by screws 19. The louter eripheral edge of the ring 18 lies Some distance inwardly of the periphery of the portion of the piston member to which it is attached and the free edge 20 of the gasket or packing ring 17 projects beyond and is adapted to fold back over the periphery of said packing ring to contact with the wall of the cylinder or cooperating piston section and effect a fluid tight joint. The portion 20 of the packing ring is adapted to be held pressed against the surface against which it is designed to bear or by means of a spring 21 seated within a groove 2Q in the periphery of the ring 18. Vent openings 23 are provided in the cylinder and each of the intermediate piston sections for the purpose of permitting of the exhaust of any air confined between the-engaging portions of the cylinder and pistons when the piston is raised, which ports are closed against the ingress of air when the piston is extended, but`permit of the entrance of air when the piston collapses to avoid the formation of i a partial vacuum.

Frein the foregoing description, taken in connection with the drawings, the construction and operation of my improved cylinder and telescopic piston will be readily understood, and it will be' seen that the invention provides a device of this character which isv simple, reliable and inexpensive of construction, and which at the same time is desi ed to secure an easy and stable motion o the parts while cushioning allshocks and jars, the advantages of which will be apparent.

I claim 1. A fluid pressure power device comprising a cylinder, and a piston comprising a plurality of telescopic sections, adapted to be extended beyond and to collapse within said cylinder, said cylinder and piston sections being provided with means for limiting the outward movements of said Ipiston sections, and means for cushioning the inward movements of said piston sections.

2. A fluid pressure power device comprising a cylinder, and a piston comprising a plurality of telescopic sections adapted to be extended beyond and to collapse within said cylinder, said cylinder and piston sections being provided with abutment surfaces to limit the outward vmovements of said piston sections and with air exhaust passages coacting with said surfaces, and means for cushioning the inward movements of said piston sections.

3. A fluid pressure power device compris ing a cylinder having a bottom head provided with a concavity therein, a piston composed of a plurality of telescopic sections, said cylinder and piston being provided with coperating abutments to limit the outward movements of said piston sections'and coacting air release ports controlled by said abutments, packing rings on the abutments of the piston sections, said pistonsections beingl adapted to be extended from and to collapse within the cylinder, and a cushioning element seated in the concavit of the bottom head of the cylinder to cus ion the closing movements of said piston sections,

In testimony whereof I affix my signature in presence of two witnesses.

JOHN E. POWELL.

Witnesses:

ST. ELMo CRocKER, CHAs. GUTHRIE.

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