US3250182A

US3250182A - Multiple extension apparatus

Info

Publication number: US3250182A
Application number: US299428A
Authority: US
Inventors: Harold K Nansel
Original assignee: Individual
Current assignee: Individual
Priority date: 1963-08-01
Filing date: 1963-08-01
Publication date: 1966-05-10
Anticipated expiration: 1983-05-10

Description

y 1966 H. K. NANSEL 3,250,182

MULTIPLE EXTENSION APPARATUS Filed Aug. 1, 1963 3 Sheets-Sheet l //v VE/VTOR HAROLD A. NAMSEL A 77'0/9/VE 9 5 H. K. NANSEL May 10, 1966 MULTIPLE EXTENS ION APPARATUS 3 Sheets-Sheet 2 Filed Aug.

HAROLD K. AMA/55L May 10, 1966 H. K. NANSEL MULTIPLE EXTENSION APPARATUS 3 Sheets-Sheet 3 Filed Aug.

PL 5 ma v 3 MM M Mk V N w K Jr r 0 a k m Z H V/KJ B mmu United States Patent 3,250,182 MULTIPLE EXTENSION APPARATUS Harold K. Nansel, Waverly, Nebr. Filed Aug. 1, 1963, Ser. No. 299,428

6 Claims. (Cl. 91-167) 7 This invention relates generally to multiple extension apparatus wherein two or more telescopically mounted extension sections are involved, and relates also to a fluid control arrangement therefor.

Although the concept of multiple extension booms is not new, wherein a plurality of telescopically arranged sections are extended one at a time, quite often the control arrangement for the structure is unsatisfactory in that the extension is not always related to the need. Oftentimes, weaker sections of a unit are extended without providing the support needed for capacity loads.

It is therefore an object of this invention to provide an improved multiple extension apparatus.

It is another object of this invention to provide a multiple extension apparatus having an improved control structure therefor.

It is a further object of this invention to provide a multiple extension apparatus having a trio of sections whereinthe second and third sections are telescoped into the first section, move out together, and wherein the third section does not move out of the second section until the second section has moved completely out of the first,

section.

Yet another object of this invention is to provide an arrangement for latching the second section to the first section whereby fluid for retracting purposes flows through a cylinder unit for said second section into a cylinder unit for said third section for actuation of said latter unit to retract said third section.

It is still another object of this invention to provide a multiple extension apparatus wherein substantially the entire piston and cylinder structure for extending and retracting said apparatus is supported within said ap-- paratus.

A further object of this invention is to provide a multiple extension apparatus, including a control arrangement therefor, which is of extreme simplicity in design and parts, effective in performance, and efiicient in operation.

These objects, and other features and advantages of this invention will become readily apparent from the following description, when taken in conjunction with the accompanying drawings, wherein:

FIG. 1 is a perspective, fragmentary view of the multiple extension apparatus of this invention, shown in completely retracted position;

FIG. 2 is a reduced view of FIG. 1, with a combined second and third section extended;

FIG. 3 is a view similar to FIG. 2, with a third section extended, the entire apparatus extended.

FIG. 4 is a longitudinal sectional view of the apparatus in the FIG. 1 position;

FIG. 5 is a longitudinal sectional view of the apparatus in the FIG. 2 position;

FIG. 6 is a longitudinal sectional view of the apparatus in the FIG. 3 position;

FIG. 7 is an enlarged sectional view taken on the line 77 in FIG. 4;

FIG. 8 is a sectional view of the cylinder units arranged in hydraulic schematic; and

FIG. 9 is a schematic of the hydraulic elements for the apparatus.

Referring now to the drawings the multiple extension apparatus of this invention is indicated generally at 10 in FIG. 1, and comprises basically a first section 11, a second section 12 (FIG. 2), a third section 13 (FIG. 3), a second section cylinder unit 14 (FIGS. 4-7), a third sec- 3,250,182 Patented May 10, 1966 tion cylinder unit 16 (FIGS. 6-9), a latch device 17 (FIG. 4), and a hydraulic circuit indicated generally at 18 in FIG. 9.

The first section 11 is an elongated tube closed at one end 19 (FIG. 5) and open at the other end 21. The closed end 19 has a tongue 22 secured thereto which can be pivotally connected to any structure 23 (FIG. 1), stationary or movable. A pair of longitudinally spaced, diametrically opposed supporting

blocks

24 and 26 are provided with the first section 11, and an elongated opening 27 is formed in one side thereof.

The opening 27 is provided for the latch device 17, pivotally connected at one end 28 to the first section 11, and having the other end 29 connected by a spring 31 to an car 32 secured to the first section. The latch device 17 has a projection 33 adapted to extend through said opening 27 and into said first section, due to the bias of said spring 31. The purpose for the latch 17 will be described hereinafter.

The second section 12 (FIG. 6) is also tubular, being of a size adapting its telescopic movement within the first section 11, having a closed end 34 and open end 36. Section 12 is also provided with a pair of longitudinally spaced, diammetrically opposed supporting

blocks

37 and 38 for the third section 13. An opening 39 (FIG. 5) is formed inthe wall of the second section '12 and is adapted, upon movement of the second section 12 to a retracted position, to be aligned with the opening 27.

The third section :13 (FIG. 6) is elongated, tubular, and of a size adapting its telescopic mounting within the second section 12. The inner end 41 of the third section 13 embraces the two cylinder units 14 and 16, and at the outer end of the third section a pulley unit lifting head 42 is mounted. The head 42 is not a. part of this invention and the invention is not to be'so limited.

The second section cylinder unit 14 (FIGS. 4 and 8) comprises an elongated tubular cylinder 43 closed at its forward end 44 and having a packing gland device 46 at its rear end which is secured to the end 34 of the second section 12. A tubular shaft 47, having a, piston 48 on its inner' end is reciprocally mounted internally the cylinder 43, and which shaft 47 has a tube 49 mounted concentrically therein.

The forward end 51 of the tube 49 is in fluid communication with the expansible chamber 52 between the piston 48 and the forward end 44 of the second section cylinder. The rear end 53 of the tube 49 is of a T-shape having a pair of fluid passages 54 and 56, and which end 53 is secured to the end 19 of the first section 11 (FIG. 5). The passage 54 is in fluid communication with an annular chamber 57 between the tube 49 and the shaft 47, and the passage 56 is in fluid communication with the interior of the tube 49. It will be noted in FIG. 8 that a port 58 places the chamber 57 in fluid communication with an annular chamber 59 formed between the shaft 47 and the wall of the cylinder 43.

The third section cylinder unit 16 ('FIG. 8), includes a housing 61 secured to the cylinder unit 14, and having a packing gland 62 at the forward end and a closed rear end 63. A shaft 64 is reciprocally inserted in said housing 61 with a piston 66 at the inner end and a cross bar 67 at the outer end which is secured to the third section 13.

The housing 43 of the cylinder unit 14 is fluidly connected to the housing 61 of the cylinder unit 16 by a conduit 68, fluid communicating the chamber 59 with a chamber 69 between the piston 66 and the packing 6-2. Another conduit 71 connects the chamber 52 to a chamber 72 between the piston 66 and the rear end 63. A relief valve 73 interposed in the conduit 71 permits fluid to flow through the conduit 71 in the direction of the arrows only after a certain pressure is attained. A check valve 74 permits a flow of fluid in an opposite direction through the conduit 71.

Referring to FIG. 9, a reservoir 76 for fluid is provided, and a pump 77 is connected to the reservoir for pumping fluid through a control valve 7 8 for transmission through a line 79 to the passage 54, orfor transmission through a line 81 to the passage 56. A by-pass line 82 is provided.

With the apparatus 10 in the position of FIG. 4, operation to extend the sections is as follows. Fluid is pumped through line 81 and passage 56 to the tube 49, whereupon the fluid enters the chamber 52. 'Fluid pressure therein forces the cylinder 43 away from the stationary piston 47 until the second section 12 attains its extended position of FIG. 5. It will be noted that in this position, the latch 17 extends through the opening 39 partially due to engagement with the third section.

Continued fluid pressure in the chamber 52 overcomes the relief valve 73 whereupon fluid enters the chamber 72 (FIG. 8) and the shaft 64 is forced outwardly of the cylinder 61, pulling the third sectin to the FIG. 6 position. As this occurs, the latch 17 is pulled completely into the FIG. 6 position, whereupon the second section 12 is locked against further movement.

During the extension process, fluid in the chambers 59, '7 and 69 is forced out thereof due to the diminishing size of the chambers, the fluid passing outwardly through the passage 54 and the line 79 for transmission to the reservoir 76.

To retract the sections, fluid is redirected through the line 79 and passage 54, and into the chambers 57 and 59. As the cylinder 43 cannot move relative to the shaft 47, due to the cylinder 46 being locked to the section 11, the fluid continues to flow through the conduit 68 into the chamber 69. This forces the piston 66 rearwardly, pulling the shaft 64 and the third section 13 back to the FIG. 5 position. The fluid in the chamber 72 escapes out through the conduit 71, the check valve 74 permitting the reverse flow, and into the chamber 52. From the chamber 52, the fluid returns to the reservoir through the tube 49.

As the third section 13 engages the latch 17 and removes it from its locking position, the fluid within the chamber 59 moves the piston 48 and effects a retraction of the shaft 47 into the chamber 52, thus completing the retraction process.

In summation, a multiple extension apparatus is described and disclosed which provides a certain, positive, and sequential movement of the second section and third section out of the first section as a unit, and of the third section out of the second section, the retraction being the exact reverse of the extension operation.

Some changes may be made in the construction and arrangement of my multiple extension apparatus without departing from the real spirit and purpose of my invention, and it is my intention to cover by. my claims, any modified forms of structure or use of mechanical equivalents which may be reasonably included within their scope.

I claim:

1. A multiple extension apparatus comprising in combination: l

a first tubular section one end of which is closed and adapted to be secured to a structure, the other end of which is open;

a second tubular section having an open outer end and and a closed inner end wall and being slidably mounted in said first section;

a third tubular section slidably mounted in said second section;

first fluid actuated means including a cylinder mounted in said second section and secured thereto, and including a shaft reciprocal within-said cylinder and secured to said first section, said first means operable to move said first and second sections longitudinally .relative to each other; i

second fluid actuated means including a cylinder mounted in said second section and operatively connected to said second section, and including further a shaft reciprocal within said fluid means cylinder and secured to said third section, said second means operable to move said second and third sections longitudinally of each other;

said first and second cylinders being positioned in side by side relationship on said inner end wall of said second tubular section; and

control means for directing fluid under pressure to said first and second means.

2. A multiple extension apparatus comprising in combination:

a second tubular section slidably mounted in said first section;

a third tubular section slidably mounted in said second section;

first fluid actuated means including a cylinder mounted in said second section and secured thereto, including a piston reciprocally mounted therein, and including further a tubular shaft one end of which is secured to said piston and the other end of which is secured to said first section;

a tube extended through said shaft and one end of which is open and extends through said piston, the other end being open at said shaft other end to the passage of fluid, a chamber formed between said tube and said shaft, a second chamber formed between said shaft and said cylinder on one side of said piston, said shaft having an opening formed therein to fluidly communicate said chambers;

second fluid actuated means operatively connected to said second and third sections and operable to move said second and third sections longitudinally of each other; and

3. A multiple extension apparatus comprising in combinationz a first hollow section one end of which is adapted to be secured to a structure, and the other end of which is open;

a second hollow section slidably mounted within said first section and having an open end;

a third hollow section slidably mounted within said second section and having an open end;

a tube extended through said shaft and one end of which isopen and extends through said piston, the other end being open at said shaft other end to the passage of fluid, a chamber formed between said tube and said shaft, a second chamber formed between said shaft and said cylinder on one side of said piston, said shaft having an opening formed therein to fluidly communicate said chambers; and

second fluid actuated means including a cylinder mounted on said first means, one end of which is in fluid communication with said first means cylinder on one side of said piston and the other end of which is in fluid communication with said first means cylinder on the other side of said piston, including further a piston reciprocally mounted within said second means cylinder between the ends thereof, and including a shaft secured at one end to said second means piston and at the other end to said third section externally of said second means cylinder.

4. A multiple extension apparatus comprising in combination;

a first hollow section one end of which is adapted to be secured to a structure;

a second hollow section slidably mounted in said first section;

a third hollow section slidably mounted in said second section;

first fluid actuated means operably connected to said first and second sections and operable to move said first and second sections longitudinally relative to each other;

second fluid actuated means operably connected to said second and third sections and operable to move said second and third sections longitudinally of each other;

control means for directing fluid under pressure to said first and second means;

latch means secured to said first section for releasably locking said second section to said first section in an extended position of said second section; and

means on said third section for engaging said latch means when said third section is in its retracted position within said section section to prevent said latch means locking said first section to said second section.

5. A multiple extension apparatus comprising in combination:

a second hollow section slidably mounted in said first section;

a third hollow section slidably mounted in said second section;

said first section having an opening formed therein, and

said second section having an opening formed therein and alignable with said first section opening upon said second section attaining an extended position;

latch means secured to said first section and movable into said openings when aligned to releasably lock said first section and second section against relative movement; and

means on said third section to engage said latch means to prevent locking engagement ot said latch means with said opening in said second section when said third section is in its retracted position.

6. A multiple extension apparatus comprising in combination:

a second hollow section slidably mounted in said first section; a

a third hollow section slidably mounted in said second section;

second fluid actuated means operably connected to said second and thirdsections and operable to move said second and third sections longitudinally of each other;

said first section having an opening formed therein, and

means including a latch pivotally mounted to said first section and movable into said first and second sections through said openings when aligned to releasably lock said first and second sections together, and including further a resilient element biasing said latch toward said openings; and

said third section having a portion disposed adjacent said opening in said second section when said third section is retracted, said portion engaging said latch to pivot it out of locking engagement with said opening in said second section.

References Cited by the Examiner UNITED STATES PATENTS 2,296,819 10/1942 Osgood 91167 X 2,701,551 2/1955 Gunning 9141-2 2,709,368 5/ 1955 Wolpert 92-2O X 2,984,373 5/196'1 Przybylski 2'1'255 3,119,455 1/1964 Fuehrer 91 16'8 X FOREIGN PATENTS 875,882 7/ 1942 France.

1,1 12,668 11/ 1955 'France.

SAMUEL LEVI-NE, Primary Examiner. E. ENGELTHALER, Examiner.

Claims

3. A MULTIPLE EXTENSION APPARATUS COMPRISING IN COMBINATION: A FIRST HOLLOW SECTION ONE END OF WHICH IS ADAPTED TO BE SECURED TO A STRUCTURE, AND THE OTHER END OF WHICH IS OPEN; A SECOND HOLLOW SECTION SLIABLY MOUNTED WITHIN SAID FIRST SECTION AND HAVING AN OPEN END; A THIRD HOLLOW SECTION SLIDABLY MOUNTED WITHIN SAID SECOND SECTION AND HAVING AN OPEN END; FIRST FLUID ACTUATED MEANS INCLUDING A CYLINDER MOUNTED IN SAID SECOND SECTION AND SECURED THERETO, INCLUDING A PISTON RECIPROCALLY MOUNTED THEREIN, AND INCLUDING FURTHER A TUBULAR SHAFT ONE END OF WHICH IS SECURED TO SAID PISTON AND THE OTHER END OF WHICH IS SECURED TO SAID FIRST SECTION; A TUBE EXTENDED THROUGH SAID SHAFT AND ONE END OF WHICH IS OPEN AND EXTENDS THORUGH SAI DPISTON, THE OTHER END BEING OPEN AT SAID SHAFT OTHER END TO THE PASSAGE OF FLUID, A CHAMBER FORMED BETWEEN SAID TUBE AND SAID SHAFT, A SECOND CHAMBER FORMED BETWEEN SAID SHAFT AND SAID CYLINDER ON ONE SIDE OF SAID PISTON, SAID SHAFT HAVING AN OPENING FORMED THEREIN TO FLUIDLY COMMUNICATE SAID CHAMBERS; AND SECOND FLUID ACTUATED MEANS INCLUDING A CYLINDER MOUNTED ON SAID FIRST MEANS, ONE END OF WHICH IS IN FLUID COMMUNICATION WITH SAID FIRST MEANS CYLINDER ON ONE SIDE OF SAID PISTON AND THE OTHER END OF WHICH IS IN FLUID COMMUNICATION WITH SAID FIRST MEANS CYLINDER ON THE OTHER SIDE OF SAID PISTON, INCLUDING FURTHER A PISTON RECIPROCALLY MOUNTED WITHIN SAID SECOND MEANS CYLINDER BETWEEN THE ENDS THEREOF, AND INCLUDING A SHAFT SECURED AT ONE END TO SAID SECOND MEANS PISTON AND AT THE OTHER END OF SAID THIRD SECTION EXTERNALLY OF SAID SECOND MEANS CYLINDER.