GB849246A - Improvements in or relating to pneumatic tools - Google Patents

Improvements in or relating to pneumatic tools

Info

Publication number
GB849246A
GB849246A GB1049458A GB1049458A GB849246A GB 849246 A GB849246 A GB 849246A GB 1049458 A GB1049458 A GB 1049458A GB 1049458 A GB1049458 A GB 1049458A GB 849246 A GB849246 A GB 849246A
Authority
GB
United Kingdom
Prior art keywords
piston
air
valve
pressure
cylinder
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
GB1049458A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ERIC BASIL JAMES
HORACE SKEET BROOM
Broom and Wade Ltd
Original Assignee
ERIC BASIL JAMES
HORACE SKEET BROOM
Broom and Wade Ltd
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 ERIC BASIL JAMES, HORACE SKEET BROOM, Broom and Wade Ltd filed Critical ERIC BASIL JAMES
Priority to GB1049458A priority Critical patent/GB849246A/en
Publication of GB849246A publication Critical patent/GB849246A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D9/14—Control devices for the reciprocating piston

Abstract

849,246. Percussive tools. BROOM & WADE Ltd., BROOM, H. S., and JAMES, E. B. March 26, 1959 [April 1, 1958], No. 10494/58. Class 124. A pneumatic percussive tool having a valve operated by the ratio of supply air pressure to the pressure in the cylinder, has at least one cushioning air chamber in connection with the cylinder at the end remote from the tool steel, the connection being through a metering hole of small dimensions relative to the air chamber. As shown, a pneumatic tool has a piston 51 operating in a cylinder 12, an anvil 45 transmitting the blow to a steel 48, and a valve 28 of cup shape having a flange moving between two seatings 26a and 26b. The valve is held in position with the flange seating on 26b by the pressure of compressed air entering through a valve 18, in this position the piston is driven upwardly. When the piston head 53 passes an exhaust port 55 air is compressed above the piston and some of this pressure is relived by air passing through one or more metering holes 57 leading to cushioning air chambers 56 situated near the top of the cylinder. The air admitted to the air chambers delays the time when the pressure above the piston is sufficient to change-over the valve and admit compressed air above the piston and drive it downwardly. It is stated that the " kick " on the reversal of movement of the piston is reduced without impairing the force of the blow.
GB1049458A 1958-04-01 1958-04-01 Improvements in or relating to pneumatic tools Expired GB849246A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1049458A GB849246A (en) 1958-04-01 1958-04-01 Improvements in or relating to pneumatic tools

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1049458A GB849246A (en) 1958-04-01 1958-04-01 Improvements in or relating to pneumatic tools

Publications (1)

Publication Number Publication Date
GB849246A true GB849246A (en) 1960-09-21

Family

ID=9968888

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1049458A Expired GB849246A (en) 1958-04-01 1958-04-01 Improvements in or relating to pneumatic tools

Country Status (1)

Country Link
GB (1) GB849246A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4327807A (en) * 1978-09-19 1982-05-04 Maco-Meudon Percussion tool casing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4327807A (en) * 1978-09-19 1982-05-04 Maco-Meudon Percussion tool casing

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