GB191229906A - Improvements in or relating to Dash-pot Mechanism for Hack Saw Machines. - Google Patents

Improvements in or relating to Dash-pot Mechanism for Hack Saw Machines.

Info

Publication number
GB191229906A
GB191229906A GB191229906DA GB191229906A GB 191229906 A GB191229906 A GB 191229906A GB 191229906D A GB191229906D A GB 191229906DA GB 191229906 A GB191229906 A GB 191229906A
Authority
GB
United Kingdom
Prior art keywords
dash
saw
piston
pot
plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Inventor
Charles Fletcher
Edward Geisler Herbert
Original Assignee
Charles Fletcher
Edward Geisler Herbert
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Charles Fletcher, Edward Geisler Herbert filed Critical Charles Fletcher
Priority to GB191229906T priority Critical
Application granted granted Critical
Publication of GB191229906A publication Critical patent/GB191229906A/en
Expired legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16FSPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32Details
    • F16F9/44Means on or in the damper for manual or non-automatic adjustment; such means combined with temperature correction
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23DPLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D51/00Sawing machines or sawing devices working with straight blades, characterised only by constructional features of particular parts; Carrying or attaching means for tools, covered by this subclass, which are connected to a carrier at both ends
    • B23D51/16Sawing machines or sawing devices working with straight blades, characterised only by constructional features of particular parts; Carrying or attaching means for tools, covered by this subclass, which are connected to a carrier at both ends of drives or feed mechanisms for straight tools, e.g. saw blades, or bows
    • B23D51/20Sawing machines or sawing devices working with straight blades, characterised only by constructional features of particular parts; Carrying or attaching means for tools, covered by this subclass, which are connected to a carrier at both ends of drives or feed mechanisms for straight tools, e.g. saw blades, or bows with controlled feed of the tool, or with special arrangements for relieving or lifting the tool on the return stroke

Abstract

29,906. Herbert, E. G., and Fletcher, C. Dec. 30. Dash-pots.-Relates to dash-pot mechanism used in hack-saw machines in which the saw is set obliquely to the saw-frame guides for supporting the saw during the return stroke, and consists is providing means for regulating the movements of the dash-pot piston. Fig. 1 shows a dash-pot piston a formed with perforations b, c covered by a flexible metal plate d secured at the centre to the piston or held yieldingly by a spring e and nut f. The tapered end of an adjustable spindle i screwing into a perforated boss h on the piston projects into the hole b and into a small hole b<1> in the metal plate d so as to control the flow of the liquid from below to above the piston during the return stroke of the saw. The piston can move upwards freely during the forward stroke, the liquid passing freely through the holes c and past the yielding plate d. A pin g on the piston holds the plate d in such a position that the holes b, b<1> register. In modifications of the dash-pot, (1) the hole b is restricted so that the plate d need not extend below it; (2) the spindle i is replaced by a screwadjusted valve or a non-return valve controlled by an adjustable spring i; (3) the piston is provided with two or more adjacent holes b or a single elongated hole, and the plate d with two or more adjacent holes b<1>, a plate hinged below the plate d being swivelled to cover or uncover one or more of the additional holes b<1>; (4) a tube fitted with a spring-controlled non-return valve connects the parts of the dash-pot cylinder above and below the piston, the holes b, b<1> being dispensed with (5) a screw-adjusted wedge strip in a recess in the dash-pot cylinder fits into a recess in the piston, a variable-sized gap being left to permit the liquid to escape from below to above the piston; or an adjustable strip of wedge or other shape may lie wholly in the recess in the cylinder; and (6) a single large hole c is used, and the passage of the liquid through it is regulated by means of a screw-adjusted or spring-loaded valve spindle, the pressure of the saw on the work during the cutting stroke being controlled by this means. In a modified arrangement of machine, two dash-pots such as that shown in Fig. 1 are arranged one on each side of the saw-frame guides, one controlling the downward movement of the saw during the return stroke, and the other the pressure of the saw upon the work during the cutting stroke. Fig. 18 shows an arrangement of two dash-pots, one on each side of the saw-frame guides, having perforated pistons fitted with metal plates d and connected together by a pipe u, in which is fitted a valve casing v. The casing v is divided by a central partition fitted with spring valves v', v<2>, which are adjusted to control the movement of the dash-pot pistons. The upper parts of the dashpot are connected by a pipe z to allow excess of liquid in one cylinder to pass to the other In a further modified arrangement, the dashpot cylinders are connected by two pipes each fitted with a regulating and non-return valve. The dash-pots may be arranged on the same side of the saw-guide axis, the valve-plate being arranged in one case below the piston and the other above. The dash-pot mechanism described may be applied to vertical hack-saw machines as well as to horizontal hack-saw machines.
GB191229906D 1912-12-30 1912-12-30 Improvements in or relating to Dash-pot Mechanism for Hack Saw Machines. Expired GB191229906A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB191229906T 1912-12-30

Publications (1)

Publication Number Publication Date
GB191229906A true GB191229906A (en) 1913-12-11

Family

ID=32576361

Family Applications (1)

Application Number Title Priority Date Filing Date
GB191229906D Expired GB191229906A (en) 1912-12-30 1912-12-30 Improvements in or relating to Dash-pot Mechanism for Hack Saw Machines.

Country Status (1)

Country Link
GB (1) GB191229906A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2474858A (en) * 1940-01-22 1949-07-05 Charles A Nicholson Aircraft arresting or retarding gear
US2722784A (en) * 1951-09-10 1955-11-08 Midwest Supply And Mfg Company Buffing head
US3220517A (en) * 1962-10-30 1965-11-30 Best available copy
EP0053339A2 (en) * 1980-12-02 1982-06-09 NORDICA S.p.A Device for controlling the flex of ski boots
US6401556B1 (en) 1999-06-23 2002-06-11 Peter Winston Hamady Precessional device and method thereof
US6629908B2 (en) 2000-05-09 2003-10-07 Peter Winston Hamady Precessional apparatus and method thereof
US7181987B2 (en) 2003-05-02 2007-02-27 Peter Winston Hamady Precessional device and method

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2474858A (en) * 1940-01-22 1949-07-05 Charles A Nicholson Aircraft arresting or retarding gear
US2722784A (en) * 1951-09-10 1955-11-08 Midwest Supply And Mfg Company Buffing head
US3220517A (en) * 1962-10-30 1965-11-30 Best available copy
EP0053339A2 (en) * 1980-12-02 1982-06-09 NORDICA S.p.A Device for controlling the flex of ski boots
EP0053339A3 (en) * 1980-12-02 1982-10-27 Nordica S.P.A Device for controlling the flex of ski and the like boots
US6401556B1 (en) 1999-06-23 2002-06-11 Peter Winston Hamady Precessional device and method thereof
US6629908B2 (en) 2000-05-09 2003-10-07 Peter Winston Hamady Precessional apparatus and method thereof
US7181987B2 (en) 2003-05-02 2007-02-27 Peter Winston Hamady Precessional device and method

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