GB714864A - Improvements relating to percussion devices - Google Patents

Improvements relating to percussion devices

Info

Publication number
GB714864A
GB714864A GB2843551A GB2843551A GB714864A GB 714864 A GB714864 A GB 714864A GB 2843551 A GB2843551 A GB 2843551A GB 2843551 A GB2843551 A GB 2843551A GB 714864 A GB714864 A GB 714864A
Authority
GB
United Kingdom
Prior art keywords
chamber
air
piston
valve
pressure
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
GB2843551A
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.)
DONALD MABRY PEARSON
Original Assignee
DONALD MABRY PEARSON
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 DONALD MABRY PEARSON filed Critical DONALD MABRY PEARSON
Publication of GB714864A publication Critical patent/GB714864A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B25D11/06—Means for driving the impulse member
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B25D11/06—Means for driving the impulse member
    • B25D11/10—Means for driving the impulse member comprising a cam mechanism

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)

Abstract

714,864. Percussive drills. PEARSON, D. M. Dec. 4, 1951 [Dec. 9, 1950; Nov. 15, 1951], No. 28435/51. Class 124 A portable percussive drill having a piston driven upwardly by an electric motor against an air cushion and downwardly by the air compressed has the downward force increased by the provision of a suction chamber in front of the piston. As shown, an electric motor 4 driving a pair of cams 11 which raise a piston 12 against an air cushion in a chamber 22, also drives an air pump 19 to introduce air into the chamber 22 to replace any loss. The required air pressure in the chamber 22 may be adjusted by a manually operated needle valve 25 which operates in conjunction with a bellows valve 27 and stabilizing chambers 30, 32. A non-return valve 37, preventing air from entering the chamber 40 in front of the piston, produces a vacuum in that chamber. A double acting compressor may replace the air pump 19 and a manually controlled valve may be used to vary the air pressure in the chamber, the pressure of one of the compressors also being controllable, Fig. 2 (not shown).
GB2843551A 1950-12-10 1951-12-04 Improvements relating to percussion devices Expired GB714864A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP4753D DE910160C (en) 1950-12-10 1950-12-10 Portable impact device

Publications (1)

Publication Number Publication Date
GB714864A true GB714864A (en) 1954-09-01

Family

ID=40497681

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2843551A Expired GB714864A (en) 1950-12-10 1951-12-04 Improvements relating to percussion devices

Country Status (2)

Country Link
DE (1) DE910160C (en)
GB (1) GB714864A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3835935A (en) * 1973-03-19 1974-09-17 Black & Decker Mfg Co Idling system for power hammer
CN103639995A (en) * 2013-11-25 2014-03-19 大连元利流体技术有限公司 Novel pneumatic push-pull clamp

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8304043A (en) * 1983-11-24 1985-06-17 Skil Nederland Nv DEVICE FOR DRIVING A DRILL AND / OR IMPACT TOOL.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3835935A (en) * 1973-03-19 1974-09-17 Black & Decker Mfg Co Idling system for power hammer
CN103639995A (en) * 2013-11-25 2014-03-19 大连元利流体技术有限公司 Novel pneumatic push-pull clamp

Also Published As

Publication number Publication date
DE910160C (en) 1954-04-29

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